*
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
- * Copyright (C) 2005 Mike Christie
+ * Copyright (C) 2005 - 2006 Mike Christie
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
#include <linux/mutex.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_request.h>
-#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport_iscsi.h>
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI/TCP data-path");
MODULE_LICENSE("GPL");
-MODULE_VERSION("0:4.445");
/* #define DEBUG_TCP */
-/* #define DEBUG_SCSI */
#define DEBUG_ASSERT
#ifdef DEBUG_TCP
-#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
+#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
#else
#define debug_tcp(fmt...)
#endif
-#ifdef DEBUG_SCSI
-#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
-#else
-#define debug_scsi(fmt...)
-#endif
-
#ifndef DEBUG_ASSERT
#ifdef BUG_ON
#undef BUG_ON
#define BUG_ON(expr)
#endif
-#define INVALID_SN_DELTA 0xffff
-
static unsigned int iscsi_max_lun = 512;
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
-/* global data */
-static kmem_cache_t *taskcache;
-
-static inline void
-iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
-{
- sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
- ibuf->sent = 0;
- ibuf->use_sendmsg = 0;
-}
-
static inline void
iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
{
iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
u8* crc)
{
- crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
- buf->sg.length += sizeof(uint32_t);
-}
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-static void
-iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
-{
- struct iscsi_session *session = conn->session;
- unsigned long flags;
-
- spin_lock_irqsave(&session->lock, flags);
- if (session->conn_cnt == 1 || session->leadconn == conn)
- session->state = ISCSI_STATE_FAILED;
- spin_unlock_irqrestore(&session->lock, flags);
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
- iscsi_conn_error(conn->cls_conn, err);
+ crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
+ buf->sg.length = tcp_conn->hdr_size;
}
static inline int
-iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
+iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
{
- uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
- uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
-
- if (max_cmdsn < exp_cmdsn -1 &&
- max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
- return ISCSI_ERR_MAX_CMDSN;
- if (max_cmdsn > session->max_cmdsn ||
- max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
- session->max_cmdsn = max_cmdsn;
- if (exp_cmdsn > session->exp_cmdsn ||
- exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
- session->exp_cmdsn = exp_cmdsn;
-
- return 0;
-}
+ struct sk_buff *skb = tcp_conn->in.skb;
-static inline int
-iscsi_hdr_extract(struct iscsi_conn *conn)
-{
- struct sk_buff *skb = conn->in.skb;
+ tcp_conn->in.zero_copy_hdr = 0;
- if (conn->in.copy >= conn->hdr_size &&
- conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
+ if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
+ tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
/*
* Zero-copy PDU Header: using connection context
* to store header pointer.
*/
if (skb_shinfo(skb)->frag_list == NULL &&
- !skb_shinfo(skb)->nr_frags)
- conn->in.hdr = (struct iscsi_hdr *)
- ((char*)skb->data + conn->in.offset);
- else {
+ !skb_shinfo(skb)->nr_frags) {
+ tcp_conn->in.hdr = (struct iscsi_hdr *)
+ ((char*)skb->data + tcp_conn->in.offset);
+ tcp_conn->in.zero_copy_hdr = 1;
+ } else {
/* ignoring return code since we checked
* in.copy before */
- skb_copy_bits(skb, conn->in.offset,
- &conn->hdr, conn->hdr_size);
- conn->in.hdr = &conn->hdr;
+ skb_copy_bits(skb, tcp_conn->in.offset,
+ &tcp_conn->hdr, tcp_conn->hdr_size);
+ tcp_conn->in.hdr = &tcp_conn->hdr;
}
- conn->in.offset += conn->hdr_size;
- conn->in.copy -= conn->hdr_size;
+ tcp_conn->in.offset += tcp_conn->hdr_size;
+ tcp_conn->in.copy -= tcp_conn->hdr_size;
} else {
int hdr_remains;
int copylen;
* copying it... This'll happen quite rarely.
*/
- if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
- conn->in.hdr_offset = 0;
+ if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
+ tcp_conn->in.hdr_offset = 0;
- hdr_remains = conn->hdr_size - conn->in.hdr_offset;
+ hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
BUG_ON(hdr_remains <= 0);
- copylen = min(conn->in.copy, hdr_remains);
- skb_copy_bits(skb, conn->in.offset,
- (char*)&conn->hdr + conn->in.hdr_offset, copylen);
+ copylen = min(tcp_conn->in.copy, hdr_remains);
+ skb_copy_bits(skb, tcp_conn->in.offset,
+ (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
+ copylen);
debug_tcp("PDU gather offset %d bytes %d in.offset %d "
- "in.copy %d\n", conn->in.hdr_offset, copylen,
- conn->in.offset, conn->in.copy);
+ "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
+ tcp_conn->in.offset, tcp_conn->in.copy);
- conn->in.offset += copylen;
- conn->in.copy -= copylen;
+ tcp_conn->in.offset += copylen;
+ tcp_conn->in.copy -= copylen;
if (copylen < hdr_remains) {
- conn->in_progress = IN_PROGRESS_HEADER_GATHER;
- conn->in.hdr_offset += copylen;
+ tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
+ tcp_conn->in.hdr_offset += copylen;
return -EAGAIN;
}
- conn->in.hdr = &conn->hdr;
- conn->discontiguous_hdr_cnt++;
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ tcp_conn->in.hdr = &tcp_conn->hdr;
+ tcp_conn->discontiguous_hdr_cnt++;
+ tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
return 0;
}
-static inline void
-iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct scsi_cmnd *sc = ctask->sc;
- struct iscsi_session *session = conn->session;
-
- spin_lock(&session->lock);
- if (unlikely(!sc)) {
- spin_unlock(&session->lock);
- return;
- }
- if (sc->sc_data_direction == DMA_TO_DEVICE) {
- struct iscsi_data_task *dtask, *n;
- /* WRITE: cleanup Data-Out's if any */
- list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
- list_del(&dtask->item);
- mempool_free(dtask, ctask->datapool);
- }
- }
- ctask->xmstate = XMSTATE_IDLE;
- ctask->r2t = NULL;
- ctask->sc = NULL;
- __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
- spin_unlock(&session->lock);
-}
-
-/**
- * iscsi_cmd_rsp - SCSI Command Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+/*
+ * must be called with session lock
+ */
+static void
+iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
- int rc;
- struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
- struct iscsi_session *session = conn->session;
- struct scsi_cmnd *sc = ctask->sc;
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc) {
- sc->result = (DID_ERROR << 16);
- goto out;
- }
-
- conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
-
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
-
- if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
- sc->result = (DID_ERROR << 16);
- goto out;
- }
-
- if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
- int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_r2t_info *r2t;
+ struct scsi_cmnd *sc;
- memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
- debug_scsi("copied %d bytes of sense\n", sensecopy);
+ /* flush ctask's r2t queues */
+ while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
+ __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
+ sizeof(void*));
+ debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
}
- if (sc->sc_data_direction == DMA_TO_DEVICE)
- goto out;
-
- if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
- int res_count = be32_to_cpu(rhdr->residual_count);
+ sc = ctask->sc;
+ if (unlikely(!sc))
+ return;
- if (res_count > 0 && res_count <= sc->request_bufflen)
- sc->resid = res_count;
- else
- sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
- sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
- sc->resid = be32_to_cpu(rhdr->residual_count);
-
-out:
- debug_scsi("done [sc %lx res %d itt 0x%x]\n",
- (long)sc, sc->result, ctask->itt);
- conn->scsirsp_pdus_cnt++;
- iscsi_ctask_cleanup(conn, ctask);
- sc->scsi_done(sc);
- return rc;
+ tcp_ctask->xmstate = XMSTATE_IDLE;
+ tcp_ctask->r2t = NULL;
}
/**
iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
int rc;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
struct iscsi_session *session = conn->session;
int datasn = be32_to_cpu(rhdr->datasn);
/*
* setup Data-In byte counter (gets decremented..)
*/
- ctask->data_count = conn->in.datalen;
+ ctask->data_count = tcp_conn->in.datalen;
- if (conn->in.datalen == 0)
+ if (tcp_conn->in.datalen == 0)
return 0;
if (ctask->datasn != datasn)
ctask->datasn++;
- ctask->data_offset = be32_to_cpu(rhdr->offset);
- if (ctask->data_offset + conn->in.datalen > ctask->total_length)
+ tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
+ if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
return ISCSI_ERR_DATA_OFFSET;
if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
struct iscsi_r2t_info *r2t)
{
struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
struct scsi_cmnd *sc = ctask->sc;
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
+ hdr = &r2t->dtask.hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
hdr->ttt = r2t->ttt;
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
r2t->solicit_datasn++;
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
+ memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
+ hdr->itt = ctask->hdr->itt;
hdr->exp_statsn = r2t->exp_statsn;
hdr->offset = cpu_to_be32(r2t->data_offset);
if (r2t->data_length > conn->max_xmit_dlength) {
r2t->sent = 0;
- iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
+ iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
- r2t->dtask = dtask;
-
if (sc->use_sg) {
int i, sg_count = 0;
struct scatterlist *sg = sc->request_buffer;
sg_count += sg->length;
}
BUG_ON(r2t->sg == NULL);
- } else
- iscsi_buf_init_iov(&ctask->sendbuf,
+ } else {
+ iscsi_buf_init_iov(&r2t->sendbuf,
(char*)sc->request_buffer + r2t->data_offset,
r2t->data_count);
-
- list_add(&dtask->item, &ctask->dataqueue);
+ r2t->sg = NULL;
+ }
}
/**
{
struct iscsi_r2t_info *r2t;
struct iscsi_session *session = conn->session;
- struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
int r2tsn = be32_to_cpu(rhdr->r2tsn);
int rc;
- if (conn->in.ahslen)
- return ISCSI_ERR_AHSLEN;
-
- if (conn->in.datalen)
+ if (tcp_conn->in.datalen) {
+ printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
+ tcp_conn->in.datalen);
return ISCSI_ERR_DATALEN;
+ }
- if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
+ if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
return ISCSI_ERR_R2TSN;
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
spin_unlock(&session->lock);
return 0;
}
- rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
+
+ rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
BUG_ON(!rc);
r2t->exp_statsn = rhdr->statsn;
r2t->data_length = be32_to_cpu(rhdr->data_length);
- if (r2t->data_length == 0 ||
- r2t->data_length > session->max_burst) {
+ if (r2t->data_length == 0) {
+ printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
spin_unlock(&session->lock);
return ISCSI_ERR_DATALEN;
}
+ if (r2t->data_length > session->max_burst)
+ debug_scsi("invalid R2T with data len %u and max burst %u."
+ "Attempting to execute request.\n",
+ r2t->data_length, session->max_burst);
+
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
if (r2t->data_offset + r2t->data_length > ctask->total_length) {
spin_unlock(&session->lock);
+ printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
+ "offset %u and total length %d\n", r2t->data_length,
+ r2t->data_offset, ctask->total_length);
return ISCSI_ERR_DATALEN;
}
iscsi_solicit_data_init(conn, ctask, r2t);
- ctask->exp_r2tsn = r2tsn + 1;
- ctask->xmstate |= XMSTATE_SOL_HDR;
- __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
- __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
+ tcp_ctask->exp_r2tsn = r2tsn + 1;
+ tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
+ __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
+ list_move_tail(&ctask->running, &conn->xmitqueue);
scsi_queue_work(session->host, &conn->xmitwork);
conn->r2t_pdus_cnt++;
}
static int
-iscsi_hdr_recv(struct iscsi_conn *conn)
+iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
{
- int rc = 0;
+ int rc = 0, opcode, ahslen;
struct iscsi_hdr *hdr;
- struct iscsi_cmd_task *ctask;
struct iscsi_session *session = conn->session;
- uint32_t cdgst, rdgst = 0;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ uint32_t cdgst, rdgst = 0, itt;
- hdr = conn->in.hdr;
+ hdr = tcp_conn->in.hdr;
/* verify PDU length */
- conn->in.datalen = ntoh24(hdr->dlength);
- if (conn->in.datalen > conn->max_recv_dlength) {
+ tcp_conn->in.datalen = ntoh24(hdr->dlength);
+ if (tcp_conn->in.datalen > conn->max_recv_dlength) {
printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
- conn->in.datalen, conn->max_recv_dlength);
+ tcp_conn->in.datalen, conn->max_recv_dlength);
return ISCSI_ERR_DATALEN;
}
- conn->data_copied = 0;
+ tcp_conn->data_copied = 0;
/* read AHS */
- conn->in.ahslen = hdr->hlength * 4;
- conn->in.offset += conn->in.ahslen;
- conn->in.copy -= conn->in.ahslen;
- if (conn->in.copy < 0) {
+ ahslen = hdr->hlength << 2;
+ tcp_conn->in.offset += ahslen;
+ tcp_conn->in.copy -= ahslen;
+ if (tcp_conn->in.copy < 0) {
printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
- "%d bytes\n", conn->in.ahslen);
+ "%d bytes\n", ahslen);
return ISCSI_ERR_AHSLEN;
}
/* calculate read padding */
- conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
- if (conn->in.padding) {
- conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
- debug_scsi("read padding %d bytes\n", conn->in.padding);
+ tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
+ if (tcp_conn->in.padding) {
+ tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
+ debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
}
if (conn->hdrdgst_en) {
struct scatterlist sg;
sg_init_one(&sg, (u8 *)hdr,
- sizeof(struct iscsi_hdr) + conn->in.ahslen);
- crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
+ sizeof(struct iscsi_hdr) + ahslen);
+ crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
+ (u8 *)&cdgst);
rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
- conn->in.ahslen);
+ ahslen);
if (cdgst != rdgst) {
- printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
- "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
- cdgst);
+ printk(KERN_ERR "iscsi_tcp: hdrdgst error "
+ "recv 0x%x calc 0x%x\n", rdgst, cdgst);
return ISCSI_ERR_HDR_DGST;
}
}
- /* save opcode for later */
- conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
-
+ opcode = hdr->opcode & ISCSI_OPCODE_MASK;
/* verify itt (itt encoding: age+cid+itt) */
- if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
- if ((hdr->itt & AGE_MASK) !=
- (session->age << AGE_SHIFT)) {
- printk(KERN_ERR "iscsi_tcp: received itt %x expected "
- "session age (%x)\n", hdr->itt,
- session->age & AGE_MASK);
- return ISCSI_ERR_BAD_ITT;
- }
-
- if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
- printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
- "CID (%x)\n", hdr->itt, conn->id);
- return ISCSI_ERR_BAD_ITT;
- }
- conn->in.itt = hdr->itt & ITT_MASK;
- } else
- conn->in.itt = hdr->itt;
+ rc = iscsi_verify_itt(conn, hdr, &itt);
+ if (rc == ISCSI_ERR_NO_SCSI_CMD) {
+ tcp_conn->in.datalen = 0; /* force drop */
+ return 0;
+ } else if (rc)
+ return rc;
debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
- hdr->opcode, conn->in.offset, conn->in.copy,
- conn->in.ahslen, conn->in.datalen);
+ opcode, tcp_conn->in.offset, tcp_conn->in.copy,
+ ahslen, tcp_conn->in.datalen);
- if (conn->in.itt < session->cmds_max) {
- ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
-
- if (!ctask->sc) {
- printk(KERN_INFO "iscsi_tcp: dropping ctask with "
- "itt 0x%x\n", ctask->itt);
- conn->in.datalen = 0; /* force drop */
- return 0;
- }
-
- if (ctask->sc->SCp.phase != session->age) {
- printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
- "expected %d\n", ctask->sc->SCp.phase,
- session->age);
- return ISCSI_ERR_SESSION_FAILED;
- }
-
- conn->in.ctask = ctask;
-
- debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
- hdr->opcode, conn->id, (long)ctask->sc,
- ctask->itt, conn->in.datalen);
-
- switch(conn->in.opcode) {
- case ISCSI_OP_SCSI_CMD_RSP:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- if (!conn->in.datalen)
- rc = iscsi_cmd_rsp(conn, ctask);
- else
- /*
- * got sense or response data; copying PDU
- * Header to the connection's header
- * placeholder
- */
- memcpy(&conn->hdr, hdr,
- sizeof(struct iscsi_hdr));
- break;
- case ISCSI_OP_SCSI_DATA_IN:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- /* save flags for non-exceptional status */
- conn->in.flags = hdr->flags;
- /* save cmd_status for sense data */
- conn->in.cmd_status =
- ((struct iscsi_data_rsp*)hdr)->cmd_status;
- rc = iscsi_data_rsp(conn, ctask);
- break;
- case ISCSI_OP_R2T:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, ctask);
- else
- rc = ISCSI_ERR_PROTO;
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
+ switch(opcode) {
+ case ISCSI_OP_SCSI_DATA_IN:
+ tcp_conn->in.ctask = session->cmds[itt];
+ rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
+ if (rc)
+ return rc;
+ /* fall through */
+ case ISCSI_OP_SCSI_CMD_RSP:
+ tcp_conn->in.ctask = session->cmds[itt];
+ if (tcp_conn->in.datalen)
+ goto copy_hdr;
+
+ spin_lock(&session->lock);
+ rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
+ spin_unlock(&session->lock);
+ break;
+ case ISCSI_OP_R2T:
+ tcp_conn->in.ctask = session->cmds[itt];
+ if (ahslen)
+ rc = ISCSI_ERR_AHSLEN;
+ else if (tcp_conn->in.ctask->sc->sc_data_direction ==
+ DMA_TO_DEVICE)
+ rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
+ else
+ rc = ISCSI_ERR_PROTO;
+ break;
+ case ISCSI_OP_LOGIN_RSP:
+ case ISCSI_OP_TEXT_RSP:
+ case ISCSI_OP_REJECT:
+ case ISCSI_OP_ASYNC_EVENT:
+ /*
+ * It is possible that we could get a PDU with a buffer larger
+ * than 8K, but there are no targets that currently do this.
+ * For now we fail until we find a vendor that needs it
+ */
+ if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH <
+ tcp_conn->in.datalen) {
+ printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
+ "but conn buffer is only %u (opcode %0x)\n",
+ tcp_conn->in.datalen,
+ DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode);
+ rc = ISCSI_ERR_PROTO;
break;
}
- } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
- conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
- session->mgmtpool_max) {
- struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
-
- debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
- conn->in.opcode, conn->id, mtask->itt,
- conn->in.datalen);
-
- switch(conn->in.opcode) {
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGOUT_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
-
- if (!conn->in.datalen) {
- rc = iscsi_recv_pdu(conn->cls_conn, hdr,
- NULL, 0);
- if (conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- case ISCSI_OP_SCSI_TMFUNC_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
- if (conn->in.datalen || conn->in.ahslen) {
- rc = ISCSI_ERR_PROTO;
- break;
- }
- conn->tmfrsp_pdus_cnt++;
- spin_lock(&session->lock);
- if (conn->tmabort_state == TMABORT_INITIAL) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- conn->tmabort_state =
- ((struct iscsi_tm_rsp *)hdr)->
- response == ISCSI_TMF_RSP_COMPLETE ?
- TMABORT_SUCCESS:TMABORT_FAILED;
- /* unblock eh_abort() */
- wake_up(&conn->ehwait);
- }
- spin_unlock(&session->lock);
- break;
- case ISCSI_OP_NOOP_IN:
- if (hdr->ttt != ISCSI_RESERVED_TAG) {
- rc = ISCSI_ERR_PROTO;
- break;
- }
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
- conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
-
- if (!conn->in.datalen) {
- struct iscsi_mgmt_task *mtask;
-
- rc = iscsi_recv_pdu(conn->cls_conn, hdr,
- NULL, 0);
- mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
- if (conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
- } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
- switch(conn->in.opcode) {
- case ISCSI_OP_NOOP_IN:
- if (!conn->in.datalen) {
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
- rc = iscsi_recv_pdu(conn->cls_conn,
- hdr, NULL, 0);
- } else
- rc = ISCSI_ERR_PROTO;
- break;
- case ISCSI_OP_REJECT:
- /* we need sth like iscsi_reject_rsp()*/
- case ISCSI_OP_ASYNC_EVENT:
- /* we need sth like iscsi_async_event_rsp() */
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
- } else
- rc = ISCSI_ERR_BAD_ITT;
+ if (tcp_conn->in.datalen)
+ goto copy_hdr;
+ /* fall through */
+ case ISCSI_OP_LOGOUT_RSP:
+ case ISCSI_OP_NOOP_IN:
+ case ISCSI_OP_SCSI_TMFUNC_RSP:
+ rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
+ break;
+ default:
+ rc = ISCSI_ERR_BAD_OPCODE;
+ break;
+ }
return rc;
+
+copy_hdr:
+ /*
+ * if we did zero copy for the header but we will need multiple
+ * skbs to complete the command then we have to copy the header
+ * for later use
+ */
+ if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
+ (tcp_conn->in.datalen + tcp_conn->in.padding +
+ (conn->datadgst_en ? 4 : 0))) {
+ debug_tcp("Copying header for later use. in.copy %d in.datalen"
+ " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
+ memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
+ sizeof(struct iscsi_hdr));
+ tcp_conn->in.hdr = &tcp_conn->hdr;
+ tcp_conn->in.zero_copy_hdr = 0;
+ }
+ return 0;
}
/**
* iscsi_ctask_copy - copy skb bits to the destanation cmd task
- * @conn: iscsi connection
+ * @conn: iscsi tcp connection
* @ctask: scsi command task
* @buf: buffer to copy to
* @buf_size: size of buffer
* buf_left left to copy from in progress buffer
**/
static inline int
-iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
void *buf, int buf_size, int offset)
{
- int buf_left = buf_size - (conn->data_copied + offset);
- int size = min(conn->in.copy, buf_left);
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ int buf_left = buf_size - (tcp_conn->data_copied + offset);
+ int size = min(tcp_conn->in.copy, buf_left);
int rc;
size = min(size, ctask->data_count);
debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
- size, conn->in.offset, conn->in.copied);
+ size, tcp_conn->in.offset, tcp_conn->in.copied);
BUG_ON(size <= 0);
- BUG_ON(ctask->sent + size > ctask->total_length);
+ BUG_ON(tcp_ctask->sent + size > ctask->total_length);
- rc = skb_copy_bits(conn->in.skb, conn->in.offset,
- (char*)buf + (offset + conn->data_copied), size);
+ rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
+ (char*)buf + (offset + tcp_conn->data_copied), size);
/* must fit into skb->len */
BUG_ON(rc);
- conn->in.offset += size;
- conn->in.copy -= size;
- conn->in.copied += size;
- conn->data_copied += size;
- ctask->sent += size;
+ tcp_conn->in.offset += size;
+ tcp_conn->in.copy -= size;
+ tcp_conn->in.copied += size;
+ tcp_conn->data_copied += size;
+ tcp_ctask->sent += size;
ctask->data_count -= size;
- BUG_ON(conn->in.copy < 0);
+ BUG_ON(tcp_conn->in.copy < 0);
BUG_ON(ctask->data_count < 0);
- if (buf_size != (conn->data_copied + offset)) {
+ if (buf_size != (tcp_conn->data_copied + offset)) {
if (!ctask->data_count) {
- BUG_ON(buf_size - conn->data_copied < 0);
+ BUG_ON(buf_size - tcp_conn->data_copied < 0);
/* done with this PDU */
- return buf_size - conn->data_copied;
+ return buf_size - tcp_conn->data_copied;
}
return -EAGAIN;
}
/* done with this buffer or with both - PDU and buffer */
- conn->data_copied = 0;
+ tcp_conn->data_copied = 0;
return 0;
}
/**
* iscsi_tcp_copy - copy skb bits to the destanation buffer
- * @conn: iscsi connection
- * @buf: buffer to copy to
- * @buf_size: number of bytes to copy
+ * @conn: iscsi tcp connection
*
* Notes:
* The function calls skb_copy_bits() and updates per-connection
* byte counters.
**/
static inline int
-iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
+iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
{
- int buf_left = buf_size - conn->data_copied;
- int size = min(conn->in.copy, buf_left);
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int buf_left = buf_size - tcp_conn->data_copied;
+ int size = min(tcp_conn->in.copy, buf_left);
int rc;
debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
- size, conn->in.offset, conn->data_copied);
+ size, tcp_conn->in.offset, tcp_conn->data_copied);
BUG_ON(size <= 0);
- rc = skb_copy_bits(conn->in.skb, conn->in.offset,
- (char*)buf + conn->data_copied, size);
+ rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
+ (char*)conn->data + tcp_conn->data_copied, size);
BUG_ON(rc);
- conn->in.offset += size;
- conn->in.copy -= size;
- conn->in.copied += size;
- conn->data_copied += size;
+ tcp_conn->in.offset += size;
+ tcp_conn->in.copy -= size;
+ tcp_conn->in.copied += size;
+ tcp_conn->data_copied += size;
- if (buf_size != conn->data_copied)
+ if (buf_size != tcp_conn->data_copied)
return -EAGAIN;
return 0;
}
static inline void
-partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
+partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
int offset, int length)
{
struct scatterlist temp;
memcpy(&temp, sg, sizeof(struct scatterlist));
temp.offset = offset;
temp.length = length;
- crypto_digest_update(conn->data_rx_tfm, &temp, 1);
+ crypto_hash_update(desc, &temp, length);
}
static void
-iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len)
+iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
{
struct scatterlist tmp;
sg_init_one(&tmp, buf, len);
- crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
+ crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
}
static int iscsi_scsi_data_in(struct iscsi_conn *conn)
{
- struct iscsi_cmd_task *ctask = conn->in.ctask;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
struct scsi_cmnd *sc = ctask->sc;
struct scatterlist *sg;
int i, offset, rc = 0;
*/
if (!sc->use_sg) {
i = ctask->data_count;
- rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
- sc->request_bufflen, ctask->data_offset);
+ rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
+ sc->request_bufflen,
+ tcp_ctask->data_offset);
if (rc == -EAGAIN)
return rc;
if (conn->datadgst_en)
- iscsi_recv_digest_update(conn, sc->request_buffer, i);
+ iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
+ i);
rc = 0;
goto done;
}
- offset = ctask->data_offset;
+ offset = tcp_ctask->data_offset;
sg = sc->request_buffer;
- if (ctask->data_offset)
- for (i = 0; i < ctask->sg_count; i++)
+ if (tcp_ctask->data_offset)
+ for (i = 0; i < tcp_ctask->sg_count; i++)
offset -= sg[i].length;
/* we've passed through partial sg*/
if (offset < 0)
offset = 0;
- for (i = ctask->sg_count; i < sc->use_sg; i++) {
+ for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
char *dest;
dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
+ rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
sg[i].length, offset);
kunmap_atomic(dest, KM_SOFTIRQ0);
if (rc == -EAGAIN)
if (!rc) {
if (conn->datadgst_en) {
if (!offset)
- crypto_digest_update(conn->data_rx_tfm,
- &sg[i], 1);
+ crypto_hash_update(
+ &tcp_conn->rx_hash,
+ &sg[i], 1);
else
- partial_sg_digest_update(conn, &sg[i],
+ partial_sg_digest_update(
+ &tcp_conn->rx_hash,
+ &sg[i],
sg[i].offset + offset,
sg[i].length - offset);
}
offset = 0;
- ctask->sg_count++;
+ tcp_ctask->sg_count++;
}
if (!ctask->data_count) {
/*
* data-in is complete, but buffer not...
*/
- partial_sg_digest_update(conn, &sg[i],
- sg[i].offset, sg[i].length-rc);
+ partial_sg_digest_update(&tcp_conn->rx_hash,
+ &sg[i],
+ sg[i].offset,
+ sg[i].length-rc);
rc = 0;
break;
}
- if (!conn->in.copy)
+ if (!tcp_conn->in.copy)
return -EAGAIN;
}
BUG_ON(ctask->data_count);
done:
/* check for non-exceptional status */
- if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
- debug_scsi("done [sc %lx res %d itt 0x%x]\n",
- (long)sc, sc->result, ctask->itt);
- conn->scsirsp_pdus_cnt++;
- iscsi_ctask_cleanup(conn, ctask);
- sc->scsi_done(sc);
+ if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
+ debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
+ (long)sc, sc->result, ctask->itt,
+ tcp_conn->in.hdr->flags);
+ spin_lock(&conn->session->lock);
+ __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
+ spin_unlock(&conn->session->lock);
}
return rc;
static int
iscsi_data_recv(struct iscsi_conn *conn)
{
- struct iscsi_session *session = conn->session;
- int rc = 0;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int rc = 0, opcode;
- switch(conn->in.opcode) {
+ opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
+ switch (opcode) {
case ISCSI_OP_SCSI_DATA_IN:
rc = iscsi_scsi_data_in(conn);
break;
- case ISCSI_OP_SCSI_CMD_RSP: {
- /*
- * SCSI Sense Data:
- * copying the entire Data Segment.
- */
- if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
- rc = -EAGAIN;
- goto exit;
- }
-
- /*
- * check for sense
- */
- conn->in.hdr = &conn->hdr;
- conn->senselen = (conn->data[0] << 8) | conn->data[1];
- rc = iscsi_cmd_rsp(conn, conn->in.ctask);
- if (!rc && conn->datadgst_en)
- iscsi_recv_digest_update(conn, conn->data,
- conn->in.datalen);
- }
- break;
+ case ISCSI_OP_SCSI_CMD_RSP:
case ISCSI_OP_TEXT_RSP:
case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_NOOP_IN: {
- struct iscsi_mgmt_task *mtask = NULL;
-
- if (conn->in.itt != ISCSI_RESERVED_TAG)
- mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
-
+ case ISCSI_OP_ASYNC_EVENT:
+ case ISCSI_OP_REJECT:
/*
* Collect data segment to the connection's data
* placeholder
*/
- if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
+ if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
rc = -EAGAIN;
goto exit;
}
- rc = iscsi_recv_pdu(conn->cls_conn, conn->in.hdr,
- conn->data, conn->in.datalen);
-
- if (!rc && conn->datadgst_en &&
- conn->in.opcode != ISCSI_OP_LOGIN_RSP)
- iscsi_recv_digest_update(conn, conn->data,
- conn->in.datalen);
-
- if (mtask && conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
- sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- case ISCSI_OP_ASYNC_EVENT:
- case ISCSI_OP_REJECT:
+ rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
+ tcp_conn->in.datalen);
+ if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
+ iscsi_recv_digest_update(tcp_conn, conn->data,
+ tcp_conn->in.datalen);
+ break;
default:
BUG_ON(1);
}
{
int rc;
struct iscsi_conn *conn = rd_desc->arg.data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
int processed;
char pad[ISCSI_PAD_LEN];
struct scatterlist sg;
* Save current SKB and its offset in the corresponding
* connection context.
*/
- conn->in.copy = skb->len - offset;
- conn->in.offset = offset;
- conn->in.skb = skb;
- conn->in.len = conn->in.copy;
- BUG_ON(conn->in.copy <= 0);
- debug_tcp("in %d bytes\n", conn->in.copy);
+ tcp_conn->in.copy = skb->len - offset;
+ tcp_conn->in.offset = offset;
+ tcp_conn->in.skb = skb;
+ tcp_conn->in.len = tcp_conn->in.copy;
+ BUG_ON(tcp_conn->in.copy <= 0);
+ debug_tcp("in %d bytes\n", tcp_conn->in.copy);
more:
- conn->in.copied = 0;
+ tcp_conn->in.copied = 0;
rc = 0;
if (unlikely(conn->suspend_rx)) {
return 0;
}
- if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
- conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
- rc = iscsi_hdr_extract(conn);
+ if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
+ tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
+ rc = iscsi_hdr_extract(tcp_conn);
if (rc) {
if (rc == -EAGAIN)
goto nomore;
else {
- iscsi_conn_failure(conn, rc);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return 0;
}
}
/*
* Verify and process incoming PDU header.
*/
- rc = iscsi_hdr_recv(conn);
- if (!rc && conn->in.datalen) {
- if (conn->datadgst_en) {
- BUG_ON(!conn->data_rx_tfm);
- crypto_digest_init(conn->data_rx_tfm);
- }
- conn->in_progress = IN_PROGRESS_DATA_RECV;
+ rc = iscsi_tcp_hdr_recv(conn);
+ if (!rc && tcp_conn->in.datalen) {
+ if (conn->datadgst_en)
+ crypto_hash_init(&tcp_conn->rx_hash);
+ tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
} else if (rc) {
iscsi_conn_failure(conn, rc);
return 0;
}
}
- if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
+ if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
uint32_t recv_digest;
+
debug_tcp("extra data_recv offset %d copy %d\n",
- conn->in.offset, conn->in.copy);
- skb_copy_bits(conn->in.skb, conn->in.offset,
- &recv_digest, 4);
- conn->in.offset += 4;
- conn->in.copy -= 4;
- if (recv_digest != conn->in.datadgst) {
+ tcp_conn->in.offset, tcp_conn->in.copy);
+ rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
+ if (rc) {
+ if (rc == -EAGAIN)
+ goto again;
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return 0;
+ }
+
+ memcpy(&recv_digest, conn->data, sizeof(uint32_t));
+ if (recv_digest != tcp_conn->in.datadgst) {
debug_tcp("iscsi_tcp: data digest error!"
"0x%x != 0x%x\n", recv_digest,
- conn->in.datadgst);
+ tcp_conn->in.datadgst);
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return 0;
} else {
debug_tcp("iscsi_tcp: data digest match!"
"0x%x == 0x%x\n", recv_digest,
- conn->in.datadgst);
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ tcp_conn->in.datadgst);
+ tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
}
- if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
+ if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
+ tcp_conn->in.copy) {
debug_tcp("data_recv offset %d copy %d\n",
- conn->in.offset, conn->in.copy);
+ tcp_conn->in.offset, tcp_conn->in.copy);
rc = iscsi_data_recv(conn);
if (rc) {
- if (rc == -EAGAIN) {
- rd_desc->count = conn->in.datalen -
- conn->in.ctask->data_count;
+ if (rc == -EAGAIN)
goto again;
- }
- iscsi_conn_failure(conn, rc);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return 0;
}
- conn->in.copy -= conn->in.padding;
- conn->in.offset += conn->in.padding;
+ tcp_conn->in.copy -= tcp_conn->in.padding;
+ tcp_conn->in.offset += tcp_conn->in.padding;
if (conn->datadgst_en) {
- if (conn->in.padding) {
- debug_tcp("padding -> %d\n", conn->in.padding);
- memset(pad, 0, conn->in.padding);
- sg_init_one(&sg, pad, conn->in.padding);
- crypto_digest_update(conn->data_rx_tfm, &sg, 1);
+ if (tcp_conn->in.padding) {
+ debug_tcp("padding -> %d\n",
+ tcp_conn->in.padding);
+ memset(pad, 0, tcp_conn->in.padding);
+ sg_init_one(&sg, pad, tcp_conn->in.padding);
+ crypto_hash_update(&tcp_conn->rx_hash,
+ &sg, sg.length);
}
- crypto_digest_final(conn->data_rx_tfm,
- (u8 *) & conn->in.datadgst);
- debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
- conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
+ crypto_hash_final(&tcp_conn->rx_hash,
+ (u8 *) &tcp_conn->in.datadgst);
+ debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
+ tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
+ tcp_conn->data_copied = 0;
} else
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
}
debug_tcp("f, processed %d from out of %d padding %d\n",
- conn->in.offset - offset, (int)len, conn->in.padding);
- BUG_ON(conn->in.offset - offset > len);
+ tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
+ BUG_ON(tcp_conn->in.offset - offset > len);
- if (conn->in.offset - offset != len) {
+ if (tcp_conn->in.offset - offset != len) {
debug_tcp("continue to process %d bytes\n",
- (int)len - (conn->in.offset - offset));
+ (int)len - (tcp_conn->in.offset - offset));
goto more;
}
nomore:
- processed = conn->in.offset - offset;
+ processed = tcp_conn->in.offset - offset;
BUG_ON(processed == 0);
return processed;
again:
- processed = conn->in.offset - offset;
+ processed = tcp_conn->in.offset - offset;
debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
processed, (int)len, (int)rd_desc->count);
BUG_ON(processed == 0);
read_lock(&sk->sk_callback_lock);
- /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
+ /*
+ * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
+ * We set count to 1 because we want the network layer to
+ * hand us all the skbs that are available. iscsi_tcp_data_recv
+ * handled pdus that cross buffers or pdus that still need data.
+ */
rd_desc.arg.data = conn;
- rd_desc.count = 0;
+ rd_desc.count = 1;
tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
read_unlock(&sk->sk_callback_lock);
static void
iscsi_tcp_state_change(struct sock *sk)
{
+ struct iscsi_tcp_conn *tcp_conn;
struct iscsi_conn *conn;
struct iscsi_session *session;
void (*old_state_change)(struct sock *);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
- old_state_change = conn->old_state_change;
+ tcp_conn = conn->dd_data;
+ old_state_change = tcp_conn->old_state_change;
read_unlock(&sk->sk_callback_lock);
iscsi_write_space(struct sock *sk)
{
struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
- conn->old_write_space(sk);
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+
+ tcp_conn->old_write_space(sk);
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
static void
iscsi_conn_set_callbacks(struct iscsi_conn *conn)
{
- struct sock *sk = conn->sock->sk;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct sock *sk = tcp_conn->sock->sk;
/* assign new callbacks */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = conn;
- conn->old_data_ready = sk->sk_data_ready;
- conn->old_state_change = sk->sk_state_change;
- conn->old_write_space = sk->sk_write_space;
+ tcp_conn->old_data_ready = sk->sk_data_ready;
+ tcp_conn->old_state_change = sk->sk_state_change;
+ tcp_conn->old_write_space = sk->sk_write_space;
sk->sk_data_ready = iscsi_tcp_data_ready;
sk->sk_state_change = iscsi_tcp_state_change;
sk->sk_write_space = iscsi_write_space;
}
static void
-iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
+iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
{
- struct sock *sk = conn->sock->sk;
+ struct sock *sk = tcp_conn->sock->sk;
/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = NULL;
- sk->sk_data_ready = conn->old_data_ready;
- sk->sk_state_change = conn->old_state_change;
- sk->sk_write_space = conn->old_write_space;
+ sk->sk_data_ready = tcp_conn->old_data_ready;
+ sk->sk_state_change = tcp_conn->old_state_change;
+ sk->sk_write_space = tcp_conn->old_write_space;
sk->sk_no_check = 0;
write_unlock_bh(&sk->sk_callback_lock);
}
static inline int
iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
{
- struct socket *sk = conn->sock;
- int offset = buf->sg.offset + buf->sent;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct socket *sk = tcp_conn->sock;
+ int offset = buf->sg.offset + buf->sent, res;
/*
* if we got use_sg=0 or are sending something we kmallocd
* slab case.
*/
if (buf->use_sendmsg)
- return sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
+ res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
+ else
+ res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
+
+ if (res >= 0) {
+ conn->txdata_octets += res;
+ buf->sent += res;
+ return res;
+ }
+
+ tcp_conn->sendpage_failures_cnt++;
+ if (res == -EAGAIN)
+ res = -ENOBUFS;
else
- return conn->sendpage(sk, buf->sg.page, offset, size, flags);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return res;
}
/**
res = iscsi_send(conn, buf, size, flags);
debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
if (size != res)
return -EAGAIN;
return 0;
- } else if (res == -EAGAIN) {
- conn->sendpage_failures_cnt++;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- } else if (res == -EPIPE)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ }
return res;
}
debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
size, buf->sent, *count, *sent, res);
if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
*count -= res;
*sent += res;
if (size != res)
return -EAGAIN;
return 0;
- } else if (res == -EAGAIN) {
- conn->sendpage_failures_cnt++;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- } else if (res == -EPIPE)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ }
return res;
}
static inline void
-iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- BUG_ON(!conn->data_tx_tfm);
- crypto_digest_init(conn->data_tx_tfm);
- ctask->digest_count = 4;
-}
-
-static int
-iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_buf *buf, uint32_t *digest, int final)
+iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_tcp_cmd_task *tcp_ctask)
{
- int rc = 0;
- int sent = 0;
-
- if (final)
- crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
-
- iscsi_buf_init_virt(buf, (char*)digest, 4);
- rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
- if (rc) {
- ctask->datadigest = *digest;
- ctask->xmstate |= XMSTATE_DATA_DIGEST;
- } else
- ctask->digest_count = 4;
- return rc;
+ crypto_hash_init(&tcp_conn->tx_hash);
+ tcp_ctask->digest_count = 4;
}
/**
struct iscsi_r2t_info *r2t, int left)
{
struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
struct scsi_cmnd *sc = ctask->sc;
int new_offset;
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
+ hdr = &r2t->dtask.hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
hdr->ttt = r2t->ttt;
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
r2t->solicit_datasn++;
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
+ memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
+ hdr->itt = ctask->hdr->itt;
hdr->exp_statsn = r2t->exp_statsn;
new_offset = r2t->data_offset + r2t->sent;
hdr->offset = cpu_to_be32(new_offset);
}
conn->dataout_pdus_cnt++;
- iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
+ iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
- r2t->dtask = dtask;
+ if (iscsi_buf_left(&r2t->sendbuf))
+ return;
- if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
- BUG_ON(ctask->bad_sg == r2t->sg);
+ if (sc->use_sg) {
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
r2t->sg += 1;
- } else
- iscsi_buf_init_iov(&ctask->sendbuf,
+ } else {
+ iscsi_buf_init_iov(&r2t->sendbuf,
(char*)sc->request_buffer + new_offset,
r2t->data_count);
-
- list_add(&dtask->item, &ctask->dataqueue);
+ r2t->sg = NULL;
+ }
}
-static void
-iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
+ unsigned long len)
{
- struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
-
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
- hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
- ctask->unsol_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
- hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
- hdr->offset = cpu_to_be32(ctask->total_length -
- ctask->r2t_data_count -
- ctask->unsol_count);
- if (ctask->unsol_count > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- ctask->data_count = conn->max_xmit_dlength;
- hdr->flags = 0;
- } else {
- hton24(hdr->dlength, ctask->unsol_count);
- ctask->data_count = ctask->unsol_count;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
- }
-
- iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- list_add(&dtask->item, &ctask->dataqueue);
+ tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
+ if (!tcp_ctask->pad_count)
+ return;
- ctask->dtask = dtask;
+ tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
+ debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
+ tcp_ctask->xmstate |= XMSTATE_W_PAD;
}
/**
- * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
+ * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
* @conn: iscsi connection
* @ctask: scsi command task
* @sc: scsi command
**/
static void
-iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct scsi_cmnd *sc)
+iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
{
- struct iscsi_session *session = conn->session;
-
- BUG_ON(__kfifo_len(ctask->r2tqueue));
-
- ctask->sc = sc;
- ctask->conn = conn;
- ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
- ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
- int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
- ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
- (session->age << AGE_SHIFT);
- ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
- ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
- ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
- memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
- memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
+ struct scsi_cmnd *sc = ctask->sc;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- ctask->mtask = NULL;
- ctask->sent = 0;
- ctask->sg_count = 0;
+ BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
- ctask->total_length = sc->request_bufflen;
+ tcp_ctask->sent = 0;
+ tcp_ctask->sg_count = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
- ctask->exp_r2tsn = 0;
- ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
+ tcp_ctask->xmstate = XMSTATE_W_HDR;
+ tcp_ctask->exp_r2tsn = 0;
BUG_ON(ctask->total_length == 0);
+
if (sc->use_sg) {
struct scatterlist *sg = sc->request_buffer;
- iscsi_buf_init_sg(&ctask->sendbuf,
- &sg[ctask->sg_count++]);
- ctask->sg = sg;
- ctask->bad_sg = sg + sc->use_sg;
+ iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
+ tcp_ctask->sg = sg + 1;
+ tcp_ctask->bad_sg = sg + sc->use_sg;
} else {
- iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
- sc->request_bufflen);
- }
-
- /*
- * Write counters:
- *
- * imm_count bytes to be sent right after
- * SCSI PDU Header
- *
- * unsol_count bytes(as Data-Out) to be sent
- * without R2T ack right after
- * immediate data
- *
- * r2t_data_count bytes to be sent via R2T ack's
- *
- * pad_count bytes to be sent as zero-padding
- */
- ctask->imm_count = 0;
- ctask->unsol_count = 0;
- ctask->unsol_datasn = 0;
- ctask->xmstate = XMSTATE_W_HDR;
- /* calculate write padding */
- ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
- if (ctask->pad_count) {
- ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
- debug_scsi("write padding %d bytes\n",
- ctask->pad_count);
- ctask->xmstate |= XMSTATE_W_PAD;
+ iscsi_buf_init_iov(&tcp_ctask->sendbuf,
+ sc->request_buffer,
+ sc->request_bufflen);
+ tcp_ctask->sg = NULL;
+ tcp_ctask->bad_sg = NULL;
}
- if (session->imm_data_en) {
- if (ctask->total_length >= session->first_burst)
- ctask->imm_count = min(session->first_burst,
- conn->max_xmit_dlength);
- else
- ctask->imm_count = min(ctask->total_length,
- conn->max_xmit_dlength);
- hton24(ctask->hdr.dlength, ctask->imm_count);
- ctask->xmstate |= XMSTATE_IMM_DATA;
- } else
- zero_data(ctask->hdr.dlength);
-
- if (!session->initial_r2t_en)
- ctask->unsol_count = min(session->first_burst,
- ctask->total_length) - ctask->imm_count;
- if (!ctask->unsol_count)
- /* No unsolicit Data-Out's */
- ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
- else
- ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
-
- ctask->r2t_data_count = ctask->total_length -
- ctask->imm_count -
- ctask->unsol_count;
-
- debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
- "r2t_data %d]\n",
+ debug_scsi("cmd [itt 0x%x total %d imm_data %d "
+ "unsol count %d, unsol offset %d]\n",
ctask->itt, ctask->total_length, ctask->imm_count,
- ctask->unsol_count, ctask->r2t_data_count);
- } else {
- ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
- if (sc->sc_data_direction == DMA_FROM_DEVICE)
- ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
- ctask->datasn = 0;
- ctask->xmstate = XMSTATE_R_HDR;
- zero_data(ctask->hdr.dlength);
- }
+ ctask->unsol_count, ctask->unsol_offset);
+ } else
+ tcp_ctask->xmstate = XMSTATE_R_HDR;
- iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
+ iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
sizeof(struct iscsi_hdr));
- conn->scsicmd_pdus_cnt++;
}
/**
- * iscsi_mtask_xmit - xmit management(immediate) task
+ * iscsi_tcp_mtask_xmit - xmit management(immediate) task
* @conn: iscsi connection
* @mtask: task management task
*
* IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
**/
static int
-iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
+iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
{
+ struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
+ int rc;
debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
- conn->id, mtask->xmstate, mtask->itt);
+ conn->id, tcp_mtask->xmstate, mtask->itt);
- if (mtask->xmstate & XMSTATE_IMM_HDR) {
- mtask->xmstate &= ~XMSTATE_IMM_HDR;
+ if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
+ tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
if (mtask->data_count)
- mtask->xmstate |= XMSTATE_IMM_DATA;
+ tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER &&
+ conn->stop_stage != STOP_CONN_RECOVER &&
conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &mtask->headbuf,
- (u8*)mtask->hdrext);
- if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
- mtask->xmstate |= XMSTATE_IMM_HDR;
+ iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
+ (u8*)tcp_mtask->hdrext);
+ rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
+ mtask->data_count);
+ if (rc) {
+ tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
if (mtask->data_count)
- mtask->xmstate &= ~XMSTATE_IMM_DATA;
- return -EAGAIN;
+ tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
+ return rc;
}
}
- if (mtask->xmstate & XMSTATE_IMM_DATA) {
+ if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
BUG_ON(!mtask->data_count);
- mtask->xmstate &= ~XMSTATE_IMM_DATA;
+ tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
/* FIXME: implement.
* Virtual buffer could be spreaded across multiple pages...
*/
do {
- if (iscsi_sendpage(conn, &mtask->sendbuf,
- &mtask->data_count, &mtask->sent)) {
- mtask->xmstate |= XMSTATE_IMM_DATA;
- return -EAGAIN;
+ int rc;
+
+ rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
+ &mtask->data_count, &tcp_mtask->sent);
+ if (rc) {
+ tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
+ return rc;
}
} while (mtask->data_count);
}
- BUG_ON(mtask->xmstate != XMSTATE_IDLE);
+ BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
+ if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
+ struct iscsi_session *session = conn->session;
+
+ spin_lock_bh(&session->lock);
+ list_del(&conn->mtask->running);
+ __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
+ sizeof(void*));
+ spin_unlock_bh(&session->lock);
+ }
return 0;
}
static inline int
-handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+iscsi_send_read_hdr(struct iscsi_conn *conn,
+ struct iscsi_tcp_cmd_task *tcp_ctask)
{
- ctask->xmstate &= ~XMSTATE_R_HDR;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
- if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
- BUG_ON(ctask->xmstate != XMSTATE_IDLE);
- return 0; /* wait for Data-In */
- }
- ctask->xmstate |= XMSTATE_R_HDR;
- return -EAGAIN;
-}
+ int rc;
-static inline int
-handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- ctask->xmstate &= ~XMSTATE_W_HDR;
+ tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
- if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
- ctask->xmstate |= XMSTATE_W_HDR;
- return -EAGAIN;
- }
- return 0;
-}
-
-static inline int
-handle_xmstate_data_digest(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
-{
- ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
- debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->datadigest, 0)) {
- ctask->xmstate |= XMSTATE_DATA_DIGEST;
- debug_tcp("resent data digest 0x%x fail!\n",
- ctask->datadigest);
- return -EAGAIN;
+ iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
+ (u8*)tcp_ctask->hdrext);
+ rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
+ if (!rc) {
+ BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
+ return 0; /* wait for Data-In */
}
- return 0;
+ tcp_ctask->xmstate |= XMSTATE_R_HDR;
+ return rc;
}
static inline int
-handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+iscsi_send_write_hdr(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask)
{
- BUG_ON(!ctask->imm_count);
- ctask->xmstate &= ~XMSTATE_IMM_DATA;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ int rc;
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- ctask->immdigest = 0;
+ tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
+ if (conn->hdrdgst_en)
+ iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
+ (u8*)tcp_ctask->hdrext);
+ rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
+ if (rc) {
+ tcp_ctask->xmstate |= XMSTATE_W_HDR;
+ return rc;
}
- for (;;) {
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
- &ctask->sent)) {
- ctask->xmstate |= XMSTATE_IMM_DATA;
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8*)&ctask->immdigest);
- debug_tcp("tx imm sendpage fail 0x%x\n",
- ctask->datadigest);
- }
- return -EAGAIN;
- }
- if (conn->datadgst_en)
- crypto_digest_update(conn->data_tx_tfm,
- &ctask->sendbuf.sg, 1);
-
- if (!ctask->imm_count)
- break;
- iscsi_buf_init_sg(&ctask->sendbuf,
- &ctask->sg[ctask->sg_count++]);
- }
+ if (ctask->imm_count) {
+ tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
+ iscsi_set_padding(tcp_ctask, ctask->imm_count);
- if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->immdigest, 1)) {
- debug_tcp("sending imm digest 0x%x fail!\n",
- ctask->immdigest);
- return -EAGAIN;
+ if (ctask->conn->datadgst_en) {
+ iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
+ tcp_ctask->immdigest = 0;
}
- debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
}
+ if (ctask->unsol_count)
+ tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
return 0;
}
-static inline int
-handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int
+iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
- struct iscsi_data_task *dtask;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int sent = 0, rc;
- ctask->xmstate |= XMSTATE_UNS_DATA;
- if (ctask->xmstate & XMSTATE_UNS_INIT) {
- iscsi_unsolicit_data_init(conn, ctask);
- BUG_ON(!ctask->dtask);
- dtask = ctask->dtask;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf,
- (u8*)dtask->hdrext);
- ctask->xmstate &= ~XMSTATE_UNS_INIT;
- }
- if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
- ctask->xmstate &= ~XMSTATE_UNS_DATA;
- ctask->xmstate |= XMSTATE_UNS_HDR;
- return -EAGAIN;
- }
+ if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
+ iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
+ tcp_ctask->pad_count);
+ if (conn->datadgst_en)
+ crypto_hash_update(&tcp_conn->tx_hash,
+ &tcp_ctask->sendbuf.sg,
+ tcp_ctask->sendbuf.sg.length);
+ } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
+ return 0;
- debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
- ctask->itt, ctask->unsol_count, ctask->sent);
- return 0;
+ tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
+ tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
+ debug_scsi("sending %d pad bytes for itt 0x%x\n",
+ tcp_ctask->pad_count, ctask->itt);
+ rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
+ &sent);
+ if (rc) {
+ debug_scsi("padding send failed %d\n", rc);
+ tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
+ }
+ return rc;
}
-static inline int
-handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int
+iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ struct iscsi_buf *buf, uint32_t *digest)
{
- struct iscsi_data_task *dtask = ctask->dtask;
-
- BUG_ON(!ctask->data_count);
- ctask->xmstate &= ~XMSTATE_UNS_DATA;
-
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- dtask->digest = 0;
- }
-
- for (;;) {
- int start = ctask->sent;
-
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
- &ctask->sent)) {
- ctask->unsol_count -= ctask->sent - start;
- ctask->xmstate |= XMSTATE_UNS_DATA;
- /* will continue with this ctask later.. */
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8 *)&dtask->digest);
- debug_tcp("tx uns data fail 0x%x\n",
- dtask->digest);
- }
- return -EAGAIN;
- }
-
- BUG_ON(ctask->sent > ctask->total_length);
- ctask->unsol_count -= ctask->sent - start;
+ struct iscsi_tcp_cmd_task *tcp_ctask;
+ struct iscsi_tcp_conn *tcp_conn;
+ int rc, sent = 0;
- /*
- * XXX:we may run here with un-initial sendbuf.
- * so pass it
- */
- if (conn->datadgst_en && ctask->sent - start > 0)
- crypto_digest_update(conn->data_tx_tfm,
- &ctask->sendbuf.sg, 1);
+ if (!conn->datadgst_en)
+ return 0;
- if (!ctask->data_count)
- break;
- iscsi_buf_init_sg(&ctask->sendbuf,
- &ctask->sg[ctask->sg_count++]);
- }
- BUG_ON(ctask->unsol_count < 0);
+ tcp_ctask = ctask->dd_data;
+ tcp_conn = conn->dd_data;
- /*
- * Done with the Data-Out. Next, check if we need
- * to send another unsolicited Data-Out.
- */
- if (ctask->unsol_count) {
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send uns digest 0x%x fail\n",
- dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("sending uns digest 0x%x, more uns\n",
- dtask->digest);
- }
- ctask->xmstate |= XMSTATE_UNS_INIT;
- return 1;
+ if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
+ crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
+ iscsi_buf_init_iov(buf, (char*)digest, 4);
}
+ tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
- if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send last uns digest 0x%x fail\n",
- dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("sending uns digest 0x%x\n",dtask->digest);
+ rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
+ if (!rc)
+ debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
+ ctask->itt);
+ else {
+ debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
+ *digest, ctask->itt);
+ tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
}
-
- return 0;
+ return rc;
}
-static inline int
-handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int
+iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
+ struct scatterlist **sg, int *sent, int *count,
+ struct iscsi_buf *digestbuf, uint32_t *digest)
{
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_info *r2t = ctask->r2t;
- struct iscsi_data_task *dtask = r2t->dtask;
- int left;
-
- ctask->xmstate &= ~XMSTATE_SOL_DATA;
- ctask->dtask = dtask;
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_conn *conn = ctask->conn;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int rc, buf_sent, offset;
+
+ while (*count) {
+ buf_sent = 0;
+ offset = sendbuf->sent;
+
+ rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
+ *sent = *sent + buf_sent;
+ if (buf_sent && conn->datadgst_en)
+ partial_sg_digest_update(&tcp_conn->tx_hash,
+ &sendbuf->sg, sendbuf->sg.offset + offset,
+ buf_sent);
+ if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
+ iscsi_buf_init_sg(sendbuf, *sg);
+ *sg = *sg + 1;
+ }
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- dtask->digest = 0;
+ if (rc)
+ return rc;
}
-solicit_again:
- /*
- * send Data-Out whitnin this R2T sequence.
- */
- if (!r2t->data_count)
- goto data_out_done;
- if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
- ctask->xmstate |= XMSTATE_SOL_DATA;
- /* will continue with this ctask later.. */
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8 *)&dtask->digest);
- debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
- }
- return -EAGAIN;
- }
+ rc = iscsi_send_padding(conn, ctask);
+ if (rc)
+ return rc;
- BUG_ON(r2t->data_count < 0);
- if (conn->datadgst_en)
- crypto_digest_update(conn->data_tx_tfm, &r2t->sendbuf.sg, 1);
+ return iscsi_send_digest(conn, ctask, digestbuf, digest);
+}
- if (r2t->data_count) {
- BUG_ON(ctask->sc->use_sg == 0);
- if (!iscsi_buf_left(&r2t->sendbuf)) {
- BUG_ON(ctask->bad_sg == r2t->sg);
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
- }
- goto solicit_again;
- }
+static int
+iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_data_task *dtask;
+ int rc;
-data_out_done:
- /*
- * Done with this Data-Out. Next, check if we have
- * to send another Data-Out for this R2T.
- */
- BUG_ON(r2t->data_length - r2t->sent < 0);
- left = r2t->data_length - r2t->sent;
- if (left) {
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send r2t data digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("r2t data send digest 0x%x\n",
- dtask->digest);
- }
- iscsi_solicit_data_cont(conn, ctask, r2t, left);
- ctask->xmstate |= XMSTATE_SOL_DATA;
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- return 1;
- }
+ tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
+ if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
+ dtask = &tcp_ctask->unsol_dtask;
- /*
- * Done with this R2T. Check if there are more
- * outstanding R2Ts ready to be processed.
- */
- BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send last r2t data digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
- }
+ iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
+ iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
+ sizeof(struct iscsi_hdr));
+ if (conn->hdrdgst_en)
+ iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
+ (u8*)dtask->hdrext);
- ctask->r2t_data_count -= r2t->data_length;
- ctask->r2t = NULL;
- spin_lock_bh(&session->lock);
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
- spin_unlock_bh(&session->lock);
- if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
- ctask->r2t = r2t;
- ctask->xmstate |= XMSTATE_SOL_DATA;
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- return 1;
+ tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
+ iscsi_set_padding(tcp_ctask, ctask->data_count);
}
- return 0;
-}
-
-static inline int
-handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_data_task *dtask = ctask->dtask;
- int sent;
-
- ctask->xmstate &= ~XMSTATE_W_PAD;
- iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
- ctask->pad_count);
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
- ctask->xmstate |= XMSTATE_W_PAD;
- return -EAGAIN;
+ rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
+ if (rc) {
+ tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
+ tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
+ return rc;
}
if (conn->datadgst_en) {
- crypto_digest_update(conn->data_tx_tfm, &ctask->sendbuf.sg, 1);
- /* imm data? */
- if (!dtask) {
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->immdigest, 1)) {
- debug_tcp("send padding digest 0x%x"
- "fail!\n", ctask->immdigest);
- return -EAGAIN;
- }
- debug_tcp("done with padding, digest 0x%x\n",
- ctask->datadigest);
- } else {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send padding digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("done with padding, digest 0x%x\n",
- dtask->digest);
- }
+ dtask = &tcp_ctask->unsol_dtask;
+ iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
+ dtask->digest = 0;
}
+ debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
+ ctask->itt, ctask->unsol_count, tcp_ctask->sent);
return 0;
}
static int
-iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
- int rc = 0;
-
- debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
- conn->id, ctask->xmstate, ctask->itt);
-
- /*
- * serialize with TMF AbortTask
- */
- if (ctask->mtask)
- return rc;
-
- if (ctask->xmstate & XMSTATE_R_HDR) {
- rc = handle_xmstate_r_hdr(conn, ctask);
- return rc;
- }
-
- if (ctask->xmstate & XMSTATE_W_HDR) {
- rc = handle_xmstate_w_hdr(conn, ctask);
- if (rc)
- return rc;
- }
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ int rc;
- /* XXX: for data digest xmit recover */
- if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
- rc = handle_xmstate_data_digest(conn, ctask);
+ if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
+ BUG_ON(!ctask->unsol_count);
+ tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
+send_hdr:
+ rc = iscsi_send_unsol_hdr(conn, ctask);
if (rc)
return rc;
}
- if (ctask->xmstate & XMSTATE_IMM_DATA) {
- rc = handle_xmstate_imm_data(conn, ctask);
- if (rc)
- return rc;
- }
+ if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
+ struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
+ int start = tcp_ctask->sent;
- if (ctask->xmstate & XMSTATE_UNS_HDR) {
- BUG_ON(!ctask->unsol_count);
- ctask->xmstate &= ~XMSTATE_UNS_HDR;
-unsolicit_head_again:
- rc = handle_xmstate_uns_hdr(conn, ctask);
+ rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
+ &tcp_ctask->sent, &ctask->data_count,
+ &dtask->digestbuf, &dtask->digest);
+ ctask->unsol_count -= tcp_ctask->sent - start;
if (rc)
return rc;
+ tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
+ /*
+ * Done with the Data-Out. Next, check if we need
+ * to send another unsolicited Data-Out.
+ */
+ if (ctask->unsol_count) {
+ debug_scsi("sending more uns\n");
+ tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
+ goto send_hdr;
+ }
}
+ return 0;
+}
- if (ctask->xmstate & XMSTATE_UNS_DATA) {
- rc = handle_xmstate_uns_data(conn, ctask);
- if (rc == 1)
- goto unsolicit_head_again;
- else if (rc)
- return rc;
- goto done;
- }
-
- if (ctask->xmstate & XMSTATE_SOL_HDR) {
- struct iscsi_r2t_info *r2t;
+static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_session *session = conn->session;
+ struct iscsi_r2t_info *r2t;
+ struct iscsi_data_task *dtask;
+ int left, rc;
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- ctask->xmstate |= XMSTATE_SOL_DATA;
- if (!ctask->r2t)
- __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
+ if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
+ tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
+ tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
+ if (!tcp_ctask->r2t)
+ __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
sizeof(void*));
-solicit_head_again:
- r2t = ctask->r2t;
+send_hdr:
+ r2t = tcp_ctask->r2t;
+ dtask = &r2t->dtask;
+
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &r2t->headbuf,
- (u8*)r2t->dtask->hdrext);
- if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
- ctask->xmstate &= ~XMSTATE_SOL_DATA;
- ctask->xmstate |= XMSTATE_SOL_HDR;
- return -EAGAIN;
+ (u8*)dtask->hdrext);
+ rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
+ if (rc) {
+ tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
+ tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
+ return rc;
+ }
+
+ if (conn->datadgst_en) {
+ iscsi_data_digest_init(conn->dd_data, tcp_ctask);
+ dtask->digest = 0;
}
+ iscsi_set_padding(tcp_ctask, r2t->data_count);
debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
r2t->sent);
}
- if (ctask->xmstate & XMSTATE_SOL_DATA) {
- rc = handle_xmstate_sol_data(conn, ctask);
- if (rc == 1)
- goto solicit_head_again;
+ if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
+ r2t = tcp_ctask->r2t;
+ dtask = &r2t->dtask;
+
+ rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
+ &r2t->sent, &r2t->data_count,
+ &dtask->digestbuf, &dtask->digest);
if (rc)
return rc;
- }
-
-done:
- /*
- * Last thing to check is whether we need to send write
- * padding. Note that we check for xmstate equality, not just the bit.
- */
- if (ctask->xmstate == XMSTATE_W_PAD)
- rc = handle_xmstate_w_pad(conn, ctask);
-
- return rc;
-}
-
-/**
- * iscsi_data_xmit - xmit any command into the scheduled connection
- * @conn: iscsi connection
- *
- * Notes:
- * The function can return -EAGAIN in which case the caller must
- * re-schedule it again later or recover. '0' return code means
- * successful xmit.
- **/
-static int
-iscsi_data_xmit(struct iscsi_conn *conn)
-{
- if (unlikely(conn->suspend_tx)) {
- debug_tcp("conn %d Tx suspended!\n", conn->id);
- return 0;
- }
-
- /*
- * Transmit in the following order:
- *
- * 1) un-finished xmit (ctask or mtask)
- * 2) immediate control PDUs
- * 3) write data
- * 4) SCSI commands
- * 5) non-immediate control PDUs
- *
- * No need to lock around __kfifo_get as long as
- * there's one producer and one consumer.
- */
+ tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
- BUG_ON(conn->ctask && conn->mtask);
-
- if (conn->ctask) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- /* done with this in-progress ctask */
- conn->ctask = NULL;
- }
- if (conn->mtask) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
- /* done with this in-progress mtask */
- conn->mtask = NULL;
- }
-
- /* process immediate first */
- if (unlikely(__kfifo_len(conn->immqueue))) {
- struct iscsi_session *session = conn->session;
- while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
- sizeof(void*))) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
-
- if (conn->mtask->hdr.itt ==
- cpu_to_be32(ISCSI_RESERVED_TAG)) {
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&conn->mtask, sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
- }
- /* done with this mtask */
- conn->mtask = NULL;
- }
-
- /* process write queue */
- while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
- sizeof(void*))) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- }
-
- /* process command queue */
- while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
- sizeof(void*))) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- }
- /* done with this ctask */
- conn->ctask = NULL;
-
- /* process the rest control plane PDUs, if any */
- if (unlikely(__kfifo_len(conn->mgmtqueue))) {
- struct iscsi_session *session = conn->session;
+ /*
+ * Done with this Data-Out. Next, check if we have
+ * to send another Data-Out for this R2T.
+ */
+ BUG_ON(r2t->data_length - r2t->sent < 0);
+ left = r2t->data_length - r2t->sent;
+ if (left) {
+ iscsi_solicit_data_cont(conn, ctask, r2t, left);
+ tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
+ tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
+ goto send_hdr;
+ }
- while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
- sizeof(void*))) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
-
- if (conn->mtask->hdr.itt ==
- cpu_to_be32(ISCSI_RESERVED_TAG)) {
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&conn->mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
- }
- /* done with this mtask */
- conn->mtask = NULL;
+ /*
+ * Done with this R2T. Check if there are more
+ * outstanding R2Ts ready to be processed.
+ */
+ spin_lock_bh(&session->lock);
+ tcp_ctask->r2t = NULL;
+ __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
+ sizeof(void*));
+ if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
+ sizeof(void*))) {
+ tcp_ctask->r2t = r2t;
+ tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
+ tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
+ spin_unlock_bh(&session->lock);
+ goto send_hdr;
+ }
+ spin_unlock_bh(&session->lock);
}
-
return 0;
-
-again:
- if (unlikely(conn->suspend_tx))
- return 0;
-
- return -EAGAIN;
}
-static void
-iscsi_xmitworker(void *data)
-{
- struct iscsi_conn *conn = data;
-
- /*
- * serialize Xmit worker on a per-connection basis.
- */
- mutex_lock(&conn->xmitmutex);
- if (iscsi_data_xmit(conn))
- scsi_queue_work(conn->session->host, &conn->xmitwork);
- mutex_unlock(&conn->xmitmutex);
-}
-
-#define FAILURE_BAD_HOST 1
-#define FAILURE_SESSION_FAILED 2
-#define FAILURE_SESSION_FREED 3
-#define FAILURE_WINDOW_CLOSED 4
-#define FAILURE_SESSION_TERMINATE 5
-
static int
-iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
+iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
- struct Scsi_Host *host;
- int reason = 0;
- struct iscsi_session *session;
- struct iscsi_conn *conn = NULL;
- struct iscsi_cmd_task *ctask = NULL;
-
- sc->scsi_done = done;
- sc->result = 0;
-
- host = sc->device->host;
- session = iscsi_hostdata(host->hostdata);
- BUG_ON(host != session->host);
-
- spin_lock(&session->lock);
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ int rc = 0;
- if (session->state != ISCSI_STATE_LOGGED_IN) {
- if (session->state == ISCSI_STATE_FAILED) {
- reason = FAILURE_SESSION_FAILED;
- goto reject;
- } else if (session->state == ISCSI_STATE_TERMINATE) {
- reason = FAILURE_SESSION_TERMINATE;
- goto fault;
- }
- reason = FAILURE_SESSION_FREED;
- goto fault;
- }
+ debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
+ conn->id, tcp_ctask->xmstate, ctask->itt);
/*
- * Check for iSCSI window and take care of CmdSN wrap-around
+ * serialize with TMF AbortTask
*/
- if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
- reason = FAILURE_WINDOW_CLOSED;
- goto reject;
- }
-
- conn = session->leadconn;
-
- __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
- BUG_ON(ctask->sc);
-
- sc->SCp.phase = session->age;
- sc->SCp.ptr = (char*)ctask;
- iscsi_cmd_init(conn, ctask, sc);
-
- __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
- debug_scsi(
- "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
- sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
- conn->id, (long)sc, ctask->itt, sc->request_bufflen,
- session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
- spin_unlock(&session->lock);
-
- scsi_queue_work(host, &conn->xmitwork);
- return 0;
-
-reject:
- spin_unlock(&session->lock);
- debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
- return SCSI_MLQUEUE_HOST_BUSY;
-
-fault:
- spin_unlock(&session->lock);
- printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
- sc->cmnd[0], reason);
- sc->sense_buffer[0] = 0x70;
- sc->sense_buffer[2] = NOT_READY;
- sc->sense_buffer[7] = 0x6;
- sc->sense_buffer[12] = 0x08;
- sc->sense_buffer[13] = 0x00;
- sc->result = (DID_NO_CONNECT << 16);
- sc->resid = sc->request_bufflen;
- sc->scsi_done(sc);
- return 0;
-}
-
-static int
-iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
-{
- if (depth > ISCSI_MAX_CMD_PER_LUN)
- depth = ISCSI_MAX_CMD_PER_LUN;
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
- return sdev->queue_depth;
-}
-
-static int
-iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
-{
- int i;
+ if (ctask->mtask)
+ return rc;
- *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (*items == NULL)
- return -ENOMEM;
+ if (tcp_ctask->xmstate & XMSTATE_R_HDR)
+ return iscsi_send_read_hdr(conn, tcp_ctask);
- q->max = max;
- q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (q->pool == NULL) {
- kfree(*items);
- return -ENOMEM;
+ if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
+ rc = iscsi_send_write_hdr(conn, ctask);
+ if (rc)
+ return rc;
}
- q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (q->queue == ERR_PTR(-ENOMEM)) {
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
+ if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
+ rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
+ &tcp_ctask->sent, &ctask->imm_count,
+ &tcp_ctask->immbuf, &tcp_ctask->immdigest);
+ if (rc)
+ return rc;
+ tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
}
- for (i = 0; i < max; i++) {
- q->pool[i] = kmalloc(item_size, GFP_KERNEL);
- if (q->pool[i] == NULL) {
- int j;
-
- for (j = 0; j < i; j++)
- kfree(q->pool[j]);
-
- kfifo_free(q->queue);
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
- }
- memset(q->pool[i], 0, item_size);
- (*items)[i] = q->pool[i];
- __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
- }
- return 0;
-}
+ rc = iscsi_send_unsol_pdu(conn, ctask);
+ if (rc)
+ return rc;
-static void
-iscsi_pool_free(struct iscsi_queue *q, void **items)
-{
- int i;
+ rc = iscsi_send_sol_pdu(conn, ctask);
+ if (rc)
+ return rc;
- for (i = 0; i < q->max; i++)
- kfree(items[i]);
- kfree(q->pool);
- kfree(items);
+ return rc;
}
static struct iscsi_cls_conn *
-iscsi_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
+iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
{
- struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
struct iscsi_conn *conn;
struct iscsi_cls_conn *cls_conn;
+ struct iscsi_tcp_conn *tcp_conn;
- cls_conn = iscsi_create_conn(cls_session, conn_idx);
+ cls_conn = iscsi_conn_setup(cls_session, conn_idx);
if (!cls_conn)
return NULL;
conn = cls_conn->dd_data;
- memset(conn, 0, sizeof(*conn));
-
- conn->cls_conn = cls_conn;
- conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- conn->id = conn_idx;
- conn->exp_statsn = 0;
- conn->tmabort_state = TMABORT_INITIAL;
-
- /* initial operational parameters */
- conn->hdr_size = sizeof(struct iscsi_hdr);
- conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
- conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
-
- /* initialize general xmit PDU commands queue */
- conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->xmitqueue == ERR_PTR(-ENOMEM))
- goto xmitqueue_alloc_fail;
-
- /* initialize write response PDU commands queue */
- conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->writequeue == ERR_PTR(-ENOMEM))
- goto writequeue_alloc_fail;
-
- /* initialize general immediate & non-immediate PDU commands queue */
- conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->immqueue == ERR_PTR(-ENOMEM))
- goto immqueue_alloc_fail;
-
- conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
- goto mgmtqueue_alloc_fail;
-
- INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
-
- /* allocate login_mtask used for the login/text sequences */
- spin_lock_bh(&session->lock);
- if (!__kfifo_get(session->mgmtpool.queue,
- (void*)&conn->login_mtask,
- sizeof(void*))) {
- spin_unlock_bh(&session->lock);
- goto login_mtask_alloc_fail;
- }
- spin_unlock_bh(&session->lock);
-
- /* allocate initial PDU receive place holder */
- if (conn->data_size <= PAGE_SIZE)
- conn->data = kmalloc(conn->data_size, GFP_KERNEL);
- else
- conn->data = (void*)__get_free_pages(GFP_KERNEL,
- get_order(conn->data_size));
- if (!conn->data)
- goto max_recv_dlenght_alloc_fail;
-
- init_timer(&conn->tmabort_timer);
- mutex_init(&conn->xmitmutex);
- init_waitqueue_head(&conn->ehwait);
-
- return cls_conn;
-
-max_recv_dlenght_alloc_fail:
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
-login_mtask_alloc_fail:
- kfifo_free(conn->mgmtqueue);
-mgmtqueue_alloc_fail:
- kfifo_free(conn->immqueue);
-immqueue_alloc_fail:
- kfifo_free(conn->writequeue);
-writequeue_alloc_fail:
- kfifo_free(conn->xmitqueue);
-xmitqueue_alloc_fail:
- iscsi_destroy_conn(cls_conn);
- return NULL;
-}
-
-static void
-iscsi_conn_destroy(struct iscsi_cls_conn *cls_conn)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_session *session = conn->session;
- unsigned long flags;
-
- mutex_lock(&conn->xmitmutex);
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
- struct sock *sk = conn->sock->sk;
-
- /*
- * conn_start() has never been called!
- * need to cleanup the socket.
- */
- write_lock_bh(&sk->sk_callback_lock);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
- write_unlock_bh(&sk->sk_callback_lock);
-
- sock_hold(conn->sock->sk);
- iscsi_conn_restore_callbacks(conn);
- sock_put(conn->sock->sk);
- sock_release(conn->sock);
- conn->sock = NULL;
- }
-
- spin_lock_bh(&session->lock);
- conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
- if (session->leadconn == conn) {
- /*
- * leading connection? then give up on recovery.
- */
- session->state = ISCSI_STATE_TERMINATE;
- wake_up(&conn->ehwait);
- }
- spin_unlock_bh(&session->lock);
-
- mutex_unlock(&conn->xmitmutex);
-
/*
- * Block until all in-progress commands for this connection
- * time out or fail.
+ * due to strange issues with iser these are not set
+ * in iscsi_conn_setup
*/
- for (;;) {
- spin_lock_irqsave(session->host->host_lock, flags);
- if (!session->host->host_busy) { /* OK for ERL == 0 */
- spin_unlock_irqrestore(session->host->host_lock, flags);
- break;
- }
- spin_unlock_irqrestore(session->host->host_lock, flags);
- msleep_interruptible(500);
- printk("conn_destroy(): host_busy %d host_failed %d\n",
- session->host->host_busy, session->host->host_failed);
- /*
- * force eh_abort() to unblock
- */
- wake_up(&conn->ehwait);
- }
-
- /* now free crypto */
- if (conn->hdrdgst_en || conn->datadgst_en) {
- if (conn->tx_tfm)
- crypto_free_tfm(conn->tx_tfm);
- if (conn->rx_tfm)
- crypto_free_tfm(conn->rx_tfm);
- if (conn->data_tx_tfm)
- crypto_free_tfm(conn->data_tx_tfm);
- if (conn->data_rx_tfm)
- crypto_free_tfm(conn->data_rx_tfm);
- }
-
- /* free conn->data, size = MaxRecvDataSegmentLength */
- if (conn->data_size <= PAGE_SIZE)
- kfree(conn->data);
- else
- free_pages((unsigned long)conn->data,
- get_order(conn->data_size));
-
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
- sizeof(void*));
- list_del(&conn->item);
- if (list_empty(&session->connections))
- session->leadconn = NULL;
- if (session->leadconn && session->leadconn == conn)
- session->leadconn = container_of(session->connections.next,
- struct iscsi_conn, item);
-
- if (session->leadconn == NULL)
- /* none connections exits.. reset sequencing */
- session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
- spin_unlock_bh(&session->lock);
-
- kfifo_free(conn->xmitqueue);
- kfifo_free(conn->writequeue);
- kfifo_free(conn->immqueue);
- kfifo_free(conn->mgmtqueue);
-
- iscsi_destroy_conn(cls_conn);
-}
-
-static int
-iscsi_conn_bind(struct iscsi_cls_session *cls_session,
- struct iscsi_cls_conn *cls_conn, uint32_t transport_fd,
- int is_leading)
-{
- struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
- struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
- struct sock *sk;
- struct socket *sock;
- int err;
-
- /* lookup for existing socket */
- sock = sockfd_lookup(transport_fd, &err);
- if (!sock) {
- printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
- return -EEXIST;
- }
-
- /* lookup for existing connection */
- spin_lock_bh(&session->lock);
- list_for_each_entry(tmp, &session->connections, item) {
- if (tmp == conn) {
- if (conn->c_stage != ISCSI_CONN_STOPPED ||
- conn->stop_stage == STOP_CONN_TERM) {
- printk(KERN_ERR "iscsi_tcp: can't bind "
- "non-stopped connection (%d:%d)\n",
- conn->c_stage, conn->stop_stage);
- spin_unlock_bh(&session->lock);
- return -EIO;
- }
- break;
- }
- }
- if (tmp != conn) {
- /* bind new iSCSI connection to session */
- conn->session = session;
-
- list_add(&conn->item, &session->connections);
- }
- spin_unlock_bh(&session->lock);
-
- if (conn->stop_stage != STOP_CONN_SUSPEND) {
- /* bind iSCSI connection and socket */
- conn->sock = sock;
-
- /* setup Socket parameters */
- sk = sock->sk;
- sk->sk_reuse = 1;
- sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
- sk->sk_allocation = GFP_ATOMIC;
-
- /* FIXME: disable Nagle's algorithm */
-
- /*
- * Intercept TCP callbacks for sendfile like receive
- * processing.
- */
- iscsi_conn_set_callbacks(conn);
-
- conn->sendpage = conn->sock->ops->sendpage;
-
- /*
- * set receive state machine into initial state
- */
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- if (is_leading)
- session->leadconn = conn;
-
- /*
- * Unblock xmitworker(), Login Phase will pass through.
- */
- clear_bit(SUSPEND_BIT, &conn->suspend_rx);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
-
- return 0;
-}
-
-static int
-iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_session *session = conn->session;
- struct sock *sk;
-
- /* FF phase warming up... */
-
- if (session == NULL) {
- printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
- return -EPERM;
- }
-
- sk = conn->sock->sk;
-
- write_lock_bh(&sk->sk_callback_lock);
- spin_lock_bh(&session->lock);
- conn->c_stage = ISCSI_CONN_STARTED;
- session->state = ISCSI_STATE_LOGGED_IN;
-
- switch(conn->stop_stage) {
- case STOP_CONN_RECOVER:
- /*
- * unblock eh_abort() if it is blocked. re-try all
- * commands after successful recovery
- */
- session->conn_cnt++;
- conn->stop_stage = 0;
- conn->tmabort_state = TMABORT_INITIAL;
- session->age++;
- wake_up(&conn->ehwait);
- break;
- case STOP_CONN_TERM:
- session->conn_cnt++;
- conn->stop_stage = 0;
- break;
- case STOP_CONN_SUSPEND:
- conn->stop_stage = 0;
- clear_bit(SUSPEND_BIT, &conn->suspend_rx);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
- break;
- default:
- break;
- }
- spin_unlock_bh(&session->lock);
- write_unlock_bh(&sk->sk_callback_lock);
-
- return 0;
-}
-
-static void
-iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_session *session = conn->session;
- struct sock *sk;
- unsigned long flags;
-
- BUG_ON(!conn->sock);
- sk = conn->sock->sk;
- write_lock_bh(&sk->sk_callback_lock);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
- write_unlock_bh(&sk->sk_callback_lock);
-
- mutex_lock(&conn->xmitmutex);
-
- spin_lock_irqsave(session->host->host_lock, flags);
- spin_lock(&session->lock);
- conn->stop_stage = flag;
- conn->c_stage = ISCSI_CONN_STOPPED;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
-
- if (flag != STOP_CONN_SUSPEND)
- session->conn_cnt--;
-
- if (session->conn_cnt == 0 || session->leadconn == conn)
- session->state = ISCSI_STATE_FAILED;
-
- spin_unlock(&session->lock);
- spin_unlock_irqrestore(session->host->host_lock, flags);
-
- if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
- struct iscsi_cmd_task *ctask;
- struct iscsi_mgmt_task *mtask;
-
- /*
- * Socket must go now.
- */
- sock_hold(conn->sock->sk);
- iscsi_conn_restore_callbacks(conn);
- sock_put(conn->sock->sk);
-
- /*
- * flush xmit queues.
- */
- spin_lock_bh(&session->lock);
- while (__kfifo_get(conn->writequeue, (void*)&ctask,
- sizeof(void*)) ||
- __kfifo_get(conn->xmitqueue, (void*)&ctask,
- sizeof(void*))) {
- struct iscsi_r2t_info *r2t;
-
- /*
- * flush ctask's r2t queues
- */
- while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
- sizeof(void*)))
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
-
- spin_unlock_bh(&session->lock);
- local_bh_disable();
- iscsi_ctask_cleanup(conn, ctask);
- local_bh_enable();
- spin_lock_bh(&session->lock);
- }
- conn->ctask = NULL;
- while (__kfifo_get(conn->immqueue, (void*)&mtask,
- sizeof(void*)) ||
- __kfifo_get(conn->mgmtqueue, (void*)&mtask,
- sizeof(void*))) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- }
- conn->mtask = NULL;
- spin_unlock_bh(&session->lock);
-
- /*
- * release socket only after we stopped data_xmit()
- * activity and flushed all outstandings
- */
- sock_release(conn->sock);
- conn->sock = NULL;
-
- /*
- * for connection level recovery we should not calculate
- * header digest. conn->hdr_size used for optimization
- * in hdr_extract() and will be re-negotiated at
- * set_param() time.
- */
- if (flag == STOP_CONN_RECOVER) {
- conn->hdr_size = sizeof(struct iscsi_hdr);
- conn->hdrdgst_en = 0;
- conn->datadgst_en = 0;
- }
- }
- mutex_unlock(&conn->xmitmutex);
-}
-
-static int
-iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
- char *data, uint32_t data_size)
-{
- struct iscsi_session *session = conn->session;
- struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
- struct iscsi_mgmt_task *mtask;
-
- spin_lock_bh(&session->lock);
- if (session->state == ISCSI_STATE_TERMINATE) {
- spin_unlock_bh(&session->lock);
- return -EPERM;
- }
- if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
- hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
- /*
- * Login and Text are sent serially, in
- * request-followed-by-response sequence.
- * Same mtask can be used. Same ITT must be used.
- * Note that login_mtask is preallocated at conn_create().
- */
- mtask = conn->login_mtask;
- else {
- BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
- BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
-
- if (!__kfifo_get(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*))) {
- spin_unlock_bh(&session->lock);
- return -ENOSPC;
- }
- }
-
- /*
- * pre-format CmdSN and ExpStatSN for outgoing PDU.
- */
- if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
- hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
- (session->age << AGE_SHIFT);
- nop->cmdsn = cpu_to_be32(session->cmdsn);
- if (conn->c_stage == ISCSI_CONN_STARTED &&
- !(hdr->opcode & ISCSI_OP_IMMEDIATE))
- session->cmdsn++;
- } else
- /* do not advance CmdSN */
- nop->cmdsn = cpu_to_be32(session->cmdsn);
+ conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
- nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
+ tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
+ if (!tcp_conn)
+ goto tcp_conn_alloc_fail;
- memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
+ conn->dd_data = tcp_conn;
+ tcp_conn->iscsi_conn = conn;
+ tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ /* initial operational parameters */
+ tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
- iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
- sizeof(struct iscsi_hdr));
+ tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_conn->tx_hash.flags = 0;
+ if (!tcp_conn->tx_hash.tfm)
+ goto free_tcp_conn;
- spin_unlock_bh(&session->lock);
+ tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_conn->rx_hash.flags = 0;
+ if (!tcp_conn->rx_hash.tfm)
+ goto free_tx_tfm;
- if (data_size) {
- memcpy(mtask->data, data, data_size);
- mtask->data_count = data_size;
- } else
- mtask->data_count = 0;
+ return cls_conn;
- mtask->xmstate = XMSTATE_IMM_HDR;
+free_tx_tfm:
+ crypto_free_hash(tcp_conn->tx_hash.tfm);
+free_tcp_conn:
+ kfree(tcp_conn);
+tcp_conn_alloc_fail:
+ iscsi_conn_teardown(cls_conn);
+ return NULL;
+}
- if (mtask->data_count) {
- iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
- mtask->data_count);
- }
+static void
+iscsi_tcp_release_conn(struct iscsi_conn *conn)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
- hdr->opcode, hdr->itt, data_size);
+ if (!tcp_conn->sock)
+ return;
- /*
- * since send_pdu() could be called at least from two contexts,
- * we need to serialize __kfifo_put, so we don't have to take
- * additional lock on fast data-path
- */
- if (hdr->opcode & ISCSI_OP_IMMEDIATE)
- __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
- else
- __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
+ sock_hold(tcp_conn->sock->sk);
+ iscsi_conn_restore_callbacks(tcp_conn);
+ sock_put(tcp_conn->sock->sk);
- scsi_queue_work(session->host, &conn->xmitwork);
- return 0;
+ sock_release(tcp_conn->sock);
+ tcp_conn->sock = NULL;
+ conn->recv_lock = NULL;
}
-static int
-iscsi_eh_host_reset(struct scsi_cmnd *sc)
+static void
+iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int digest = 0;
- spin_lock_bh(&session->lock);
- if (session->state == ISCSI_STATE_TERMINATE) {
- debug_scsi("failing host reset: session terminated "
- "[CID %d age %d]", conn->id, session->age);
- spin_unlock_bh(&session->lock);
- return FAILED;
- }
- spin_unlock_bh(&session->lock);
+ if (conn->hdrdgst_en || conn->datadgst_en)
+ digest = 1;
- debug_scsi("failing connection CID %d due to SCSI host reset "
- "[itt 0x%x age %d]", conn->id, ctask->itt,
- session->age);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ iscsi_tcp_release_conn(conn);
+ iscsi_conn_teardown(cls_conn);
- return SUCCESS;
+ /* now free tcp_conn */
+ if (digest) {
+ if (tcp_conn->tx_hash.tfm)
+ crypto_free_hash(tcp_conn->tx_hash.tfm);
+ if (tcp_conn->rx_hash.tfm)
+ crypto_free_hash(tcp_conn->rx_hash.tfm);
+ }
+
+ kfree(tcp_conn);
}
static void
-iscsi_tmabort_timedout(unsigned long data)
+iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- spin_lock(&session->lock);
- if (conn->tmabort_state == TMABORT_INITIAL) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&ctask->mtask, sizeof(void*));
- conn->tmabort_state = TMABORT_TIMEDOUT;
- debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
- (long)ctask->sc, ctask->itt);
- /* unblock eh_abort() */
- wake_up(&conn->ehwait);
- }
- spin_unlock(&session->lock);
+ iscsi_conn_stop(cls_conn, flag);
+ iscsi_tcp_release_conn(conn);
+ tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
}
static int
-iscsi_eh_abort(struct scsi_cmnd *sc)
+iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
+ int is_leading)
{
- int rc;
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
-
- conn->eh_abort_cnt++;
- debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct sock *sk;
+ struct socket *sock;
+ int err;
- /*
- * two cases for ERL=0 here:
- *
- * 1) connection-level failure;
- * 2) recovery due protocol error;
- */
- mutex_lock(&conn->xmitmutex);
- spin_lock_bh(&session->lock);
- if (session->state != ISCSI_STATE_LOGGED_IN) {
- if (session->state == ISCSI_STATE_TERMINATE) {
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto failed;
- }
- spin_unlock_bh(&session->lock);
- } else {
- struct iscsi_tm *hdr = &conn->tmhdr;
+ /* lookup for existing socket */
+ sock = sockfd_lookup((int)transport_eph, &err);
+ if (!sock) {
+ printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
+ return -EEXIST;
+ }
- /*
- * Still LOGGED_IN...
- */
+ err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (err)
+ return err;
- if (!ctask->sc || sc->SCp.phase != session->age) {
- /*
- * 1) ctask completed before time out. But session
- * is still ok => Happy Retry.
- * 2) session was re-open during time out of ctask.
- */
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto success;
- }
- conn->tmabort_state = TMABORT_INITIAL;
- spin_unlock_bh(&session->lock);
+ /* bind iSCSI connection and socket */
+ tcp_conn->sock = sock;
- /*
- * ctask timed out but session is OK
- * ERL=0 requires task mgmt abort to be issued on each
- * failed command. requests must be serialized.
- */
- memset(hdr, 0, sizeof(struct iscsi_tm));
- hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
- hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->rtt = ctask->hdr.itt;
- hdr->refcmdsn = ctask->hdr.cmdsn;
-
- rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
- NULL, 0);
- if (rc) {
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
- } else {
- struct iscsi_r2t_info *r2t;
-
- /*
- * TMF abort vs. TMF response race logic
- */
- spin_lock_bh(&session->lock);
- ctask->mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[(hdr->itt & ITT_MASK) -
- ISCSI_MGMT_ITT_OFFSET];
- /*
- * have to flush r2tqueue to avoid r2t leaks
- */
- while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
- sizeof(void*))) {
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- }
- if (conn->tmabort_state == TMABORT_INITIAL) {
- conn->tmfcmd_pdus_cnt++;
- conn->tmabort_timer.expires = 3*HZ + jiffies;
- conn->tmabort_timer.function =
- iscsi_tmabort_timedout;
- conn->tmabort_timer.data = (unsigned long)ctask;
- add_timer(&conn->tmabort_timer);
- debug_scsi("abort sent [itt 0x%x]", ctask->itt);
- } else {
- if (!ctask->sc ||
- conn->tmabort_state == TMABORT_SUCCESS) {
- conn->tmabort_state = TMABORT_INITIAL;
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto success;
- }
- conn->tmabort_state = TMABORT_INITIAL;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- }
- spin_unlock_bh(&session->lock);
- }
- }
- mutex_unlock(&conn->xmitmutex);
+ /* setup Socket parameters */
+ sk = sock->sk;
+ sk->sk_reuse = 1;
+ sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
+ sk->sk_allocation = GFP_ATOMIC;
+ /* FIXME: disable Nagle's algorithm */
/*
- * block eh thread until:
- *
- * 1) abort response;
- * 2) abort timeout;
- * 3) session re-opened;
- * 4) session terminated;
+ * Intercept TCP callbacks for sendfile like receive
+ * processing.
*/
- for (;;) {
- int p_state = session->state;
-
- rc = wait_event_interruptible(conn->ehwait,
- (p_state == ISCSI_STATE_LOGGED_IN ?
- (session->state == ISCSI_STATE_TERMINATE ||
- conn->tmabort_state != TMABORT_INITIAL) :
- (session->state == ISCSI_STATE_TERMINATE ||
- session->state == ISCSI_STATE_LOGGED_IN)));
- if (rc) {
- /* shutdown.. */
- session->state = ISCSI_STATE_TERMINATE;
- goto failed;
- }
-
- if (signal_pending(current))
- flush_signals(current);
-
- if (session->state == ISCSI_STATE_TERMINATE)
- goto failed;
-
- spin_lock_bh(&session->lock);
- if (sc->SCp.phase == session->age &&
- (conn->tmabort_state == TMABORT_TIMEDOUT ||
- conn->tmabort_state == TMABORT_FAILED)) {
- conn->tmabort_state = TMABORT_INITIAL;
- if (!ctask->sc) {
- /*
- * ctask completed before tmf abort response or
- * time out.
- * But session is still ok => Happy Retry.
- */
- spin_unlock_bh(&session->lock);
- break;
- }
- spin_unlock_bh(&session->lock);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- continue;
- }
- spin_unlock_bh(&session->lock);
- break;
- }
-
-success:
- debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
- rc = SUCCESS;
- goto exit;
+ conn->recv_lock = &sk->sk_callback_lock;
+ iscsi_conn_set_callbacks(conn);
+ tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
+ /*
+ * set receive state machine into initial state
+ */
+ tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
-failed:
- debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
- rc = FAILED;
+ return 0;
+}
-exit:
- del_timer_sync(&conn->tmabort_timer);
+/* called with host lock */
+static void
+iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
+ char *data, uint32_t data_size)
+{
+ struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
- mutex_lock(&conn->xmitmutex);
- if (conn->sock) {
- struct sock *sk = conn->sock->sk;
+ iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
+ sizeof(struct iscsi_hdr));
+ tcp_mtask->xmstate = XMSTATE_IMM_HDR;
+ tcp_mtask->sent = 0;
- write_lock_bh(&sk->sk_callback_lock);
- iscsi_ctask_cleanup(conn, ctask);
- write_unlock_bh(&sk->sk_callback_lock);
- }
- mutex_unlock(&conn->xmitmutex);
- return rc;
+ if (mtask->data_count)
+ iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
+ mtask->data_count);
}
static int
*/
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
/*
* pre-allocated x4 as much r2ts to handle race when
*/
/* R2T pool */
- if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
- (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
+ if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
+ (void***)&tcp_ctask->r2ts,
+ sizeof(struct iscsi_r2t_info))) {
goto r2t_alloc_fail;
}
/* R2T xmit queue */
- ctask->r2tqueue = kfifo_alloc(
+ tcp_ctask->r2tqueue = kfifo_alloc(
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
- if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
- goto r2t_alloc_fail;
- }
-
- /*
- * number of
- * Data-Out PDU's within R2T-sequence can be quite big;
- * using mempool
- */
- ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
- mempool_alloc_slab, mempool_free_slab, taskcache);
- if (ctask->datapool == NULL) {
- kfifo_free(ctask->r2tqueue);
- iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
+ if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
+ iscsi_pool_free(&tcp_ctask->r2tpool,
+ (void**)tcp_ctask->r2ts);
goto r2t_alloc_fail;
}
- INIT_LIST_HEAD(&ctask->dataqueue);
}
return 0;
r2t_alloc_fail:
for (i = 0; i < cmd_i; i++) {
- mempool_destroy(session->cmds[i]->datapool);
- kfifo_free(session->cmds[i]->r2tqueue);
- iscsi_pool_free(&session->cmds[i]->r2tpool,
- (void**)session->cmds[i]->r2ts);
+ struct iscsi_cmd_task *ctask = session->cmds[i];
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+
+ kfifo_free(tcp_ctask->r2tqueue);
+ iscsi_pool_free(&tcp_ctask->r2tpool,
+ (void**)tcp_ctask->r2ts);
}
return -ENOMEM;
}
int i;
for (i = 0; i < session->cmds_max; i++) {
- mempool_destroy(session->cmds[i]->datapool);
- kfifo_free(session->cmds[i]->r2tqueue);
- iscsi_pool_free(&session->cmds[i]->r2tpool,
- (void**)session->cmds[i]->r2ts);
- }
-}
-
-static struct scsi_host_template iscsi_sht = {
- .name = "iSCSI Initiator over TCP/IP, v."
- ISCSI_VERSION_STR,
- .queuecommand = iscsi_queuecommand,
- .change_queue_depth = iscsi_change_queue_depth,
- .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
- .sg_tablesize = ISCSI_SG_TABLESIZE,
- .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
- .eh_abort_handler = iscsi_eh_abort,
- .eh_host_reset_handler = iscsi_eh_host_reset,
- .use_clustering = DISABLE_CLUSTERING,
- .proc_name = "iscsi_tcp",
- .this_id = -1,
-};
-
-static struct iscsi_transport iscsi_tcp_transport;
-
-static struct iscsi_cls_session *
-iscsi_session_create(struct scsi_transport_template *scsit,
- uint32_t initial_cmdsn, uint32_t *sid)
-{
- struct Scsi_Host *shost;
- struct iscsi_session *session;
- int cmd_i;
-
- shost = iscsi_transport_create_session(scsit, &iscsi_tcp_transport);
- if (!shost)
- return NULL;
-
- session = iscsi_hostdata(shost->hostdata);
- memset(session, 0, sizeof(struct iscsi_session));
- session->host = shost;
- session->state = ISCSI_STATE_FREE;
- session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
- session->cmds_max = ISCSI_XMIT_CMDS_MAX;
- session->cmdsn = initial_cmdsn;
- session->exp_cmdsn = initial_cmdsn + 1;
- session->max_cmdsn = initial_cmdsn + 1;
- session->max_r2t = 1;
- *sid = shost->host_no;
-
- /* initialize SCSI PDU commands pool */
- if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
- (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
- goto cmdpool_alloc_fail;
-
- /* pre-format cmds pool with ITT */
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
- session->cmds[cmd_i]->itt = cmd_i;
-
- spin_lock_init(&session->lock);
- INIT_LIST_HEAD(&session->connections);
-
- /* initialize immediate command pool */
- if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
- (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
- goto mgmtpool_alloc_fail;
-
-
- /* pre-format immediate cmds pool with ITT */
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
- session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
- session->mgmt_cmds[cmd_i]->data = kmalloc(
- DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
- if (!session->mgmt_cmds[cmd_i]->data) {
- int j;
-
- for (j = 0; j < cmd_i; j++)
- kfree(session->mgmt_cmds[j]->data);
- goto immdata_alloc_fail;
- }
- }
+ struct iscsi_cmd_task *ctask = session->cmds[i];
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- if (iscsi_r2tpool_alloc(session))
- goto r2tpool_alloc_fail;
-
- return hostdata_session(shost->hostdata);
-
-r2tpool_alloc_fail:
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
- kfree(session->mgmt_cmds[cmd_i]->data);
-immdata_alloc_fail:
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
-mgmtpool_alloc_fail:
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
-cmdpool_alloc_fail:
- iscsi_transport_destroy_session(shost);
- return NULL;
-}
-
-static void
-iscsi_session_destroy(struct iscsi_cls_session *cls_session)
-{
- struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
- int cmd_i;
- struct iscsi_data_task *dtask, *n;
-
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
- list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
- list_del(&dtask->item);
- mempool_free(dtask, ctask->datapool);
- }
+ kfifo_free(tcp_ctask->r2tqueue);
+ iscsi_pool_free(&tcp_ctask->r2tpool,
+ (void**)tcp_ctask->r2ts);
}
-
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
- kfree(session->mgmt_cmds[cmd_i]->data);
-
- iscsi_r2tpool_free(session);
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
-
- iscsi_transport_destroy_session(shost);
}
static int
iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
- uint32_t value)
+ char *buf, int buflen)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_session *session = conn->session;
-
- spin_lock_bh(&session->lock);
- if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER) {
- printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
- param);
- spin_unlock_bh(&session->lock);
- return 0;
- }
- spin_unlock_bh(&session->lock);
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ int value;
switch(param) {
- case ISCSI_PARAM_MAX_RECV_DLENGTH: {
- char *saveptr = conn->data;
- gfp_t flags = GFP_KERNEL;
-
- if (conn->data_size >= value) {
- conn->max_recv_dlength = value;
- break;
- }
-
- spin_lock_bh(&session->lock);
- if (conn->stop_stage == STOP_CONN_RECOVER)
- flags = GFP_ATOMIC;
- spin_unlock_bh(&session->lock);
-
- if (value <= PAGE_SIZE)
- conn->data = kmalloc(value, flags);
- else
- conn->data = (void*)__get_free_pages(flags,
- get_order(value));
- if (conn->data == NULL) {
- conn->data = saveptr;
- return -ENOMEM;
- }
- if (conn->data_size <= PAGE_SIZE)
- kfree(saveptr);
- else
- free_pages((unsigned long)saveptr,
- get_order(conn->data_size));
- conn->max_recv_dlength = value;
- conn->data_size = value;
- }
- break;
- case ISCSI_PARAM_MAX_XMIT_DLENGTH:
- conn->max_xmit_dlength = value;
- break;
case ISCSI_PARAM_HDRDGST_EN:
- conn->hdrdgst_en = value;
- conn->hdr_size = sizeof(struct iscsi_hdr);
- if (conn->hdrdgst_en) {
- conn->hdr_size += sizeof(__u32);
- if (!conn->tx_tfm)
- conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
- if (!conn->tx_tfm)
- return -ENOMEM;
- if (!conn->rx_tfm)
- conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
- if (!conn->rx_tfm) {
- crypto_free_tfm(conn->tx_tfm);
- return -ENOMEM;
- }
- } else {
- if (conn->tx_tfm)
- crypto_free_tfm(conn->tx_tfm);
- if (conn->rx_tfm)
- crypto_free_tfm(conn->rx_tfm);
- }
+ iscsi_set_param(cls_conn, param, buf, buflen);
+ tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
+ if (conn->hdrdgst_en)
+ tcp_conn->hdr_size += sizeof(__u32);
break;
case ISCSI_PARAM_DATADGST_EN:
- conn->datadgst_en = value;
- if (conn->datadgst_en) {
- if (!conn->data_tx_tfm)
- conn->data_tx_tfm =
- crypto_alloc_tfm("crc32c", 0);
- if (!conn->data_tx_tfm)
- return -ENOMEM;
- if (!conn->data_rx_tfm)
- conn->data_rx_tfm =
- crypto_alloc_tfm("crc32c", 0);
- if (!conn->data_rx_tfm) {
- crypto_free_tfm(conn->data_tx_tfm);
- return -ENOMEM;
- }
- } else {
- if (conn->data_tx_tfm)
- crypto_free_tfm(conn->data_tx_tfm);
- if (conn->data_rx_tfm)
- crypto_free_tfm(conn->data_rx_tfm);
- }
- conn->sendpage = conn->datadgst_en ?
- sock_no_sendpage : conn->sock->ops->sendpage;
- break;
- case ISCSI_PARAM_INITIAL_R2T_EN:
- session->initial_r2t_en = value;
+ iscsi_set_param(cls_conn, param, buf, buflen);
+ tcp_conn->sendpage = conn->datadgst_en ?
+ sock_no_sendpage : tcp_conn->sock->ops->sendpage;
break;
case ISCSI_PARAM_MAX_R2T:
+ sscanf(buf, "%d", &value);
if (session->max_r2t == roundup_pow_of_two(value))
break;
iscsi_r2tpool_free(session);
- session->max_r2t = value;
+ iscsi_set_param(cls_conn, param, buf, buflen);
if (session->max_r2t & (session->max_r2t - 1))
session->max_r2t = roundup_pow_of_two(session->max_r2t);
if (iscsi_r2tpool_alloc(session))
return -ENOMEM;
break;
- case ISCSI_PARAM_IMM_DATA_EN:
- session->imm_data_en = value;
- break;
- case ISCSI_PARAM_FIRST_BURST:
- session->first_burst = value;
- break;
- case ISCSI_PARAM_MAX_BURST:
- session->max_burst = value;
- break;
- case ISCSI_PARAM_PDU_INORDER_EN:
- session->pdu_inorder_en = value;
- break;
- case ISCSI_PARAM_DATASEQ_INORDER_EN:
- session->dataseq_inorder_en = value;
- break;
- case ISCSI_PARAM_ERL:
- session->erl = value;
- break;
- case ISCSI_PARAM_IFMARKER_EN:
- BUG_ON(value);
- session->ifmarker_en = value;
- break;
- case ISCSI_PARAM_OFMARKER_EN:
- BUG_ON(value);
- session->ofmarker_en = value;
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-static int
-iscsi_session_get_param(struct iscsi_cls_session *cls_session,
- enum iscsi_param param, uint32_t *value)
-{
- struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
-
- switch(param) {
- case ISCSI_PARAM_INITIAL_R2T_EN:
- *value = session->initial_r2t_en;
- break;
- case ISCSI_PARAM_MAX_R2T:
- *value = session->max_r2t;
- break;
- case ISCSI_PARAM_IMM_DATA_EN:
- *value = session->imm_data_en;
- break;
- case ISCSI_PARAM_FIRST_BURST:
- *value = session->first_burst;
- break;
- case ISCSI_PARAM_MAX_BURST:
- *value = session->max_burst;
- break;
- case ISCSI_PARAM_PDU_INORDER_EN:
- *value = session->pdu_inorder_en;
- break;
- case ISCSI_PARAM_DATASEQ_INORDER_EN:
- *value = session->dataseq_inorder_en;
- break;
- case ISCSI_PARAM_ERL:
- *value = session->erl;
- break;
- case ISCSI_PARAM_IFMARKER_EN:
- *value = session->ifmarker_en;
- break;
- case ISCSI_PARAM_OFMARKER_EN:
- *value = session->ofmarker_en;
- break;
default:
- return ISCSI_ERR_PARAM_NOT_FOUND;
+ return iscsi_set_param(cls_conn, param, buf, buflen);
}
return 0;
}
static int
-iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
- enum iscsi_param param, uint32_t *value)
+iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf)
{
struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct inet_sock *inet;
+ struct ipv6_pinfo *np;
+ struct sock *sk;
+ int len;
switch(param) {
- case ISCSI_PARAM_MAX_RECV_DLENGTH:
- *value = conn->max_recv_dlength;
- break;
- case ISCSI_PARAM_MAX_XMIT_DLENGTH:
- *value = conn->max_xmit_dlength;
- break;
- case ISCSI_PARAM_HDRDGST_EN:
- *value = conn->hdrdgst_en;
+ case ISCSI_PARAM_CONN_PORT:
+ mutex_lock(&conn->xmitmutex);
+ if (!tcp_conn->sock) {
+ mutex_unlock(&conn->xmitmutex);
+ return -EINVAL;
+ }
+
+ inet = inet_sk(tcp_conn->sock->sk);
+ len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
+ mutex_unlock(&conn->xmitmutex);
break;
- case ISCSI_PARAM_DATADGST_EN:
- *value = conn->datadgst_en;
+ case ISCSI_PARAM_CONN_ADDRESS:
+ mutex_lock(&conn->xmitmutex);
+ if (!tcp_conn->sock) {
+ mutex_unlock(&conn->xmitmutex);
+ return -EINVAL;
+ }
+
+ sk = tcp_conn->sock->sk;
+ if (sk->sk_family == PF_INET) {
+ inet = inet_sk(sk);
+ len = sprintf(buf, "%u.%u.%u.%u\n",
+ NIPQUAD(inet->daddr));
+ } else {
+ np = inet6_sk(sk);
+ len = sprintf(buf,
+ "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ NIP6(np->daddr));
+ }
+ mutex_unlock(&conn->xmitmutex);
break;
default:
- return ISCSI_ERR_PARAM_NOT_FOUND;
+ return iscsi_conn_get_param(cls_conn, param, buf);
}
- return 0;
+ return len;
}
static void
iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
{
struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
stats->txdata_octets = conn->txdata_octets;
stats->rxdata_octets = conn->rxdata_octets;
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
stats->custom_length = 3;
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
- stats->custom[0].value = conn->sendpage_failures_cnt;
+ stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
- stats->custom[1].value = conn->discontiguous_hdr_cnt;
+ stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
strcpy(stats->custom[2].desc, "eh_abort_cnt");
stats->custom[2].value = conn->eh_abort_cnt;
}
-static int
-iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
- char *data, uint32_t data_size)
+static struct iscsi_cls_session *
+iscsi_tcp_session_create(struct iscsi_transport *iscsit,
+ struct scsi_transport_template *scsit,
+ uint32_t initial_cmdsn, uint32_t *hostno)
{
- struct iscsi_conn *conn = cls_conn->dd_data;
- int rc;
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ uint32_t hn;
+ int cmd_i;
+
+ cls_session = iscsi_session_setup(iscsit, scsit,
+ sizeof(struct iscsi_tcp_cmd_task),
+ sizeof(struct iscsi_tcp_mgmt_task),
+ initial_cmdsn, &hn);
+ if (!cls_session)
+ return NULL;
+ *hostno = hn;
- mutex_lock(&conn->xmitmutex);
- rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
- mutex_unlock(&conn->xmitmutex);
+ session = class_to_transport_session(cls_session);
+ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
+ struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
+ struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- return rc;
+ ctask->hdr = &tcp_ctask->hdr;
+ }
+
+ for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
+ struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
+ struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
+
+ mtask->hdr = &tcp_mtask->hdr;
+ }
+
+ if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
+ goto r2tpool_alloc_fail;
+
+ return cls_session;
+
+r2tpool_alloc_fail:
+ iscsi_session_teardown(cls_session);
+ return NULL;
+}
+
+static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
+{
+ iscsi_r2tpool_free(class_to_transport_session(cls_session));
+ iscsi_session_teardown(cls_session);
}
+static struct scsi_host_template iscsi_sht = {
+ .name = "iSCSI Initiator over TCP/IP",
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = iscsi_change_queue_depth,
+ .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
+ .sg_tablesize = ISCSI_SG_TABLESIZE,
+ .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_host_reset_handler = iscsi_eh_host_reset,
+ .use_clustering = DISABLE_CLUSTERING,
+ .proc_name = "iscsi_tcp",
+ .this_id = -1,
+};
+
static struct iscsi_transport iscsi_tcp_transport = {
.owner = THIS_MODULE,
.name = "tcp",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
| CAP_DATADGST,
+ .param_mask = ISCSI_MAX_RECV_DLENGTH |
+ ISCSI_MAX_XMIT_DLENGTH |
+ ISCSI_HDRDGST_EN |
+ ISCSI_DATADGST_EN |
+ ISCSI_INITIAL_R2T_EN |
+ ISCSI_MAX_R2T |
+ ISCSI_IMM_DATA_EN |
+ ISCSI_FIRST_BURST |
+ ISCSI_MAX_BURST |
+ ISCSI_PDU_INORDER_EN |
+ ISCSI_DATASEQ_INORDER_EN |
+ ISCSI_ERL |
+ ISCSI_CONN_PORT |
+ ISCSI_CONN_ADDRESS |
+ ISCSI_EXP_STATSN |
+ ISCSI_PERSISTENT_PORT |
+ ISCSI_PERSISTENT_ADDRESS |
+ ISCSI_TARGET_NAME |
+ ISCSI_TPGT,
.host_template = &iscsi_sht,
- .hostdata_size = sizeof(struct iscsi_session),
.conndata_size = sizeof(struct iscsi_conn),
.max_conn = 1,
.max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
- .create_session = iscsi_session_create,
- .destroy_session = iscsi_session_destroy,
- .create_conn = iscsi_conn_create,
- .bind_conn = iscsi_conn_bind,
- .destroy_conn = iscsi_conn_destroy,
+ /* session management */
+ .create_session = iscsi_tcp_session_create,
+ .destroy_session = iscsi_tcp_session_destroy,
+ /* connection management */
+ .create_conn = iscsi_tcp_conn_create,
+ .bind_conn = iscsi_tcp_conn_bind,
+ .destroy_conn = iscsi_tcp_conn_destroy,
.set_param = iscsi_conn_set_param,
- .get_conn_param = iscsi_conn_get_param,
+ .get_conn_param = iscsi_tcp_conn_get_param,
.get_session_param = iscsi_session_get_param,
.start_conn = iscsi_conn_start,
- .stop_conn = iscsi_conn_stop,
+ .stop_conn = iscsi_tcp_conn_stop,
+ /* IO */
.send_pdu = iscsi_conn_send_pdu,
.get_stats = iscsi_conn_get_stats,
+ .init_cmd_task = iscsi_tcp_cmd_init,
+ .init_mgmt_task = iscsi_tcp_mgmt_init,
+ .xmit_cmd_task = iscsi_tcp_ctask_xmit,
+ .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
+ .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
+ /* recovery */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
};
static int __init
iscsi_tcp_init(void)
{
if (iscsi_max_lun < 1) {
- printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
+ printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
+ iscsi_max_lun);
return -EINVAL;
}
iscsi_tcp_transport.max_lun = iscsi_max_lun;
- taskcache = kmem_cache_create("iscsi_taskcache",
- sizeof(struct iscsi_data_task), 0,
- SLAB_HWCACHE_ALIGN, NULL, NULL);
- if (!taskcache)
- return -ENOMEM;
-
if (!iscsi_register_transport(&iscsi_tcp_transport))
- kmem_cache_destroy(taskcache);
+ return -ENODEV;
return 0;
}
iscsi_tcp_exit(void)
{
iscsi_unregister_transport(&iscsi_tcp_transport);
- kmem_cache_destroy(taskcache);
}
module_init(iscsi_tcp_init);
git.openpandora.org / pandora-kernel.git / blobdiff