drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

   1 /*
   2  * cxgb4i.c: Chelsio T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by:  Karen Xie (kxie@chelsio.com)
  11  *              Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/version.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <scsi/scsi_host.h>
  20 #include <net/tcp.h>
  21 #include <net/dst.h>
  22 #include <linux/netdevice.h>
  23
  24 #include "t4_msg.h"
  25 #include "cxgb4.h"
  26 #include "cxgb4_uld.h"
  27 #include "t4fw_api.h"
  28 #include "l2t.h"
  29 #include "cxgb4i.h"
  30
  31 static unsigned int dbg_level;
  32
  33 #include "../libcxgbi.h"
  34
  35 #define DRV_MODULE_NAME         "cxgb4i"
  36 #define DRV_MODULE_DESC         "Chelsio T4 iSCSI Driver"
  37 #define DRV_MODULE_VERSION      "0.9.1"
  38 #define DRV_MODULE_RELDATE      "Aug. 2010"
  39
  40 static char version[] =
  41         DRV_MODULE_DESC " " DRV_MODULE_NAME
  42         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  43
  44 MODULE_AUTHOR("Chelsio Communications, Inc.");
  45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  46 MODULE_VERSION(DRV_MODULE_VERSION);
  47 MODULE_LICENSE("GPL");
  48
  49 module_param(dbg_level, uint, 0644);
  50 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
  51
  52 static int cxgb4i_rcv_win = 256 * 1024;
  53 module_param(cxgb4i_rcv_win, int, 0644);
  54 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
  55
  56 static int cxgb4i_snd_win = 128 * 1024;
  57 module_param(cxgb4i_snd_win, int, 0644);
  58 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
  59
  60 static int cxgb4i_rx_credit_thres = 10 * 1024;
  61 module_param(cxgb4i_rx_credit_thres, int, 0644);
  62 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
  63                 "RX credits return threshold in bytes (default=10KB)");
  64
  65 static unsigned int cxgb4i_max_connect = (8 * 1024);
  66 module_param(cxgb4i_max_connect, uint, 0644);
  67 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
  68
  69 static unsigned short cxgb4i_sport_base = 20000;
  70 module_param(cxgb4i_sport_base, ushort, 0644);
  71 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
  72
  73 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
  74
  75 static void *t4_uld_add(const struct cxgb4_lld_info *);
  76 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
  77 static int t4_uld_state_change(void *, enum cxgb4_state state);
  78
  79 static const struct cxgb4_uld_info cxgb4i_uld_info = {
  80         .name = DRV_MODULE_NAME,
  81         .add = t4_uld_add,
  82         .rx_handler = t4_uld_rx_handler,
  83         .state_change = t4_uld_state_change,
  84 };
  85
  86 static struct scsi_host_template cxgb4i_host_template = {
  87         .module         = THIS_MODULE,
  88         .name           = DRV_MODULE_NAME,
  89         .proc_name      = DRV_MODULE_NAME,
  90         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
  91         .queuecommand   = iscsi_queuecommand,
  92         .change_queue_depth = iscsi_change_queue_depth,
  93         .sg_tablesize   = SG_ALL,
  94         .max_sectors    = 0xFFFF,
  95         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  96         .eh_abort_handler = iscsi_eh_abort,
  97         .eh_device_reset_handler = iscsi_eh_device_reset,
  98         .eh_target_reset_handler = iscsi_eh_recover_target,
  99         .target_alloc   = iscsi_target_alloc,
 100         .use_clustering = DISABLE_CLUSTERING,
 101         .this_id        = -1,
 102 };
 103
 104 static struct iscsi_transport cxgb4i_iscsi_transport = {
 105         .owner          = THIS_MODULE,
 106         .name           = DRV_MODULE_NAME,
 107         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 108                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 109                                 CAP_PADDING_OFFLOAD,
 110         .param_mask     = ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
 111                                 ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
 112                                 ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
 113                                 ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
 114                                 ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
 115                                 ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
 116                                 ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 117                                 ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
 118                                 ISCSI_PERSISTENT_ADDRESS |
 119                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 120                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 121                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 122                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 123                                 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
 124                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 125                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 126         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 127                                 ISCSI_HOST_INITIATOR_NAME |
 128                                 ISCSI_HOST_NETDEV_NAME,
 129         .get_host_param = cxgbi_get_host_param,
 130         .set_host_param = cxgbi_set_host_param,
 131         /* session management */
 132         .create_session = cxgbi_create_session,
 133         .destroy_session        = cxgbi_destroy_session,
 134         .get_session_param = iscsi_session_get_param,
 135         /* connection management */
 136         .create_conn    = cxgbi_create_conn,
 137         .bind_conn              = cxgbi_bind_conn,
 138         .destroy_conn   = iscsi_tcp_conn_teardown,
 139         .start_conn             = iscsi_conn_start,
 140         .stop_conn              = iscsi_conn_stop,
 141         .get_conn_param = cxgbi_get_conn_param,
 142         .set_param      = cxgbi_set_conn_param,
 143         .get_stats      = cxgbi_get_conn_stats,
 144         /* pdu xmit req from user space */
 145         .send_pdu       = iscsi_conn_send_pdu,
 146         /* task */
 147         .init_task      = iscsi_tcp_task_init,
 148         .xmit_task      = iscsi_tcp_task_xmit,
 149         .cleanup_task   = cxgbi_cleanup_task,
 150         /* pdu */
 151         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 152         .init_pdu       = cxgbi_conn_init_pdu,
 153         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 154         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 155         /* TCP connect/disconnect */
 156         .ep_connect     = cxgbi_ep_connect,
 157         .ep_poll        = cxgbi_ep_poll,
 158         .ep_disconnect  = cxgbi_ep_disconnect,
 159         /* Error recovery timeout call */
 160         .session_recovery_timedout = iscsi_session_recovery_timedout,
 161 };
 162
 163 static struct scsi_transport_template *cxgb4i_stt;
 164
 165 /*
 166  * CPL (Chelsio Protocol Language) defines a message passing interface between
 167  * the host driver and Chelsio asic.
 168  * The section below implments CPLs that related to iscsi tcp connection
 169  * open/close/abort and data send/receive.
 170  */
 171 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
 172 #define RCV_BUFSIZ_MASK         0x3FFU
 173 #define MAX_IMM_TX_PKT_LEN      128
 174
 175 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
 176                                 const struct cxgbi_sock *csk)
 177 {
 178         skb->queue_mapping = queue;
 179 }
 180
 181 static int push_tx_frames(struct cxgbi_sock *, int);
 182
 183 /*
 184  * is_ofld_imm - check whether a packet can be sent as immediate data
 185  * @skb: the packet
 186  *
 187  * Returns true if a packet can be sent as an offload WR with immediate
 188  * data.  We currently use the same limit as for Ethernet packets.
 189  */
 190 static inline int is_ofld_imm(const struct sk_buff *skb)
 191 {
 192         return skb->len <= (MAX_IMM_TX_PKT_LEN -
 193                         sizeof(struct fw_ofld_tx_data_wr));
 194 }
 195
 196 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 197                                 struct l2t_entry *e)
 198 {
 199         struct cpl_act_open_req *req;
 200         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 201         unsigned long long opt0;
 202         unsigned int opt2;
 203         unsigned int qid_atid = ((unsigned int)csk->atid) |
 204                                  (((unsigned int)csk->rss_qid) << 14);
 205
 206         opt0 = KEEP_ALIVE(1) |
 207                 WND_SCALE(wscale) |
 208                 MSS_IDX(csk->mss_idx) |
 209                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 210                 TX_CHAN(csk->tx_chan) |
 211                 SMAC_SEL(csk->smac_idx) |
 212                 ULP_MODE(ULP_MODE_ISCSI) |
 213                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 214         opt2 = RX_CHANNEL(0) |
 215                 RSS_QUEUE_VALID |
 216                 (1 << 20) | (1 << 22) |
 217                 RSS_QUEUE(csk->rss_qid);
 218
 219         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 220         req = (struct cpl_act_open_req *)skb->head;
 221
 222         INIT_TP_WR(req, 0);
 223         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 224                                         qid_atid));
 225         req->local_port = csk->saddr.sin_port;
 226         req->peer_port = csk->daddr.sin_port;
 227         req->local_ip = csk->saddr.sin_addr.s_addr;
 228         req->peer_ip = csk->daddr.sin_addr.s_addr;
 229         req->opt0 = cpu_to_be64(opt0);
 230         req->params = 0;
 231         req->opt2 = cpu_to_be32(opt2);
 232
 233         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 234                 "csk 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 235                 csk, &req->local_ip, ntohs(req->local_port),
 236                 &req->peer_ip, ntohs(req->peer_port),
 237                 csk->atid, csk->rss_qid);
 238
 239         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 240 }
 241
 242 static void send_close_req(struct cxgbi_sock *csk)
 243 {
 244         struct sk_buff *skb = csk->cpl_close;
 245         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 246         unsigned int tid = csk->tid;
 247
 248         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 249                 "csk 0x%p,%u,0x%lx, tid %u.\n",
 250                 csk, csk->state, csk->flags, csk->tid);
 251         csk->cpl_close = NULL;
 252         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 253         INIT_TP_WR(req, tid);
 254         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 255         req->rsvd = 0;
 256
 257         cxgbi_sock_skb_entail(csk, skb);
 258         if (csk->state >= CTP_ESTABLISHED)
 259                 push_tx_frames(csk, 1);
 260 }
 261
 262 static void abort_arp_failure(void *handle, struct sk_buff *skb)
 263 {
 264         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
 265         struct cpl_abort_req *req;
 266
 267         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 268                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
 269                 csk, csk->state, csk->flags, csk->tid);
 270         req = (struct cpl_abort_req *)skb->data;
 271         req->cmd = CPL_ABORT_NO_RST;
 272         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 273 }
 274
 275 static void send_abort_req(struct cxgbi_sock *csk)
 276 {
 277         struct cpl_abort_req *req;
 278         struct sk_buff *skb = csk->cpl_abort_req;
 279
 280         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
 281                 return;
 282         cxgbi_sock_set_state(csk, CTP_ABORTING);
 283         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 284         cxgbi_sock_purge_write_queue(csk);
 285
 286         csk->cpl_abort_req = NULL;
 287         req = (struct cpl_abort_req *)skb->head;
 288         set_queue(skb, CPL_PRIORITY_DATA, csk);
 289         req->cmd = CPL_ABORT_SEND_RST;
 290         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 291         INIT_TP_WR(req, csk->tid);
 292         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 293         req->rsvd0 = htonl(csk->snd_nxt);
 294         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 295
 296         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 297                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 298                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 299                 req->rsvd1);
 300
 301         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 302 }
 303
 304 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 305 {
 306         struct sk_buff *skb = csk->cpl_abort_rpl;
 307         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 308
 309         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 310                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 311                 csk, csk->state, csk->flags, csk->tid, rst_status);
 312
 313         csk->cpl_abort_rpl = NULL;
 314         set_queue(skb, CPL_PRIORITY_DATA, csk);
 315         INIT_TP_WR(rpl, csk->tid);
 316         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 317         rpl->cmd = rst_status;
 318         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 319 }
 320
 321 /*
 322  * CPL connection rx data ack: host ->
 323  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 324  * credits sent.
 325  */
 326 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 327 {
 328         struct sk_buff *skb;
 329         struct cpl_rx_data_ack *req;
 330
 331         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 332                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 333                 csk, csk->state, csk->flags, csk->tid, credits);
 334
 335         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 336         if (!skb) {
 337                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 338                 return 0;
 339         }
 340         req = (struct cpl_rx_data_ack *)skb->head;
 341
 342         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 343         INIT_TP_WR(req, csk->tid);
 344         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 345                                       csk->tid));
 346         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
 347         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 348         return credits;
 349 }
 350
 351 /*
 352  * sgl_len - calculates the size of an SGL of the given capacity
 353  * @n: the number of SGL entries
 354  * Calculates the number of flits needed for a scatter/gather list that
 355  * can hold the given number of entries.
 356  */
 357 static inline unsigned int sgl_len(unsigned int n)
 358 {
 359         n--;
 360         return (3 * n) / 2 + (n & 1) + 2;
 361 }
 362
 363 /*
 364  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 365  * @skb: the packet
 366  *
 367  * Returns the number of flits needed for the given offload packet.
 368  * These packets are already fully constructed and no additional headers
 369  * will be added.
 370  */
 371 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 372 {
 373         unsigned int flits, cnt;
 374
 375         if (is_ofld_imm(skb))
 376                 return DIV_ROUND_UP(skb->len, 8);
 377         flits = skb_transport_offset(skb) / 8;
 378         cnt = skb_shinfo(skb)->nr_frags;
 379         if (skb->tail != skb->transport_header)
 380                 cnt++;
 381         return flits + sgl_len(cnt);
 382 }
 383
 384 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
 385 {
 386         struct sk_buff *skb;
 387         struct fw_flowc_wr *flowc;
 388         int flowclen, i;
 389
 390         flowclen = 80;
 391         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 392         flowc = (struct fw_flowc_wr *)skb->head;
 393         flowc->op_to_nparams =
 394                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
 395         flowc->flowid_len16 =
 396                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
 397                                 FW_WR_FLOWID(csk->tid));
 398         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 399         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 400         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 401         flowc->mnemval[1].val = htonl(csk->tx_chan);
 402         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 403         flowc->mnemval[2].val = htonl(csk->tx_chan);
 404         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 405         flowc->mnemval[3].val = htonl(csk->rss_qid);
 406         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 407         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 408         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 409         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 410         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 411         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 412         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 413         flowc->mnemval[7].val = htonl(csk->advmss);
 414         flowc->mnemval[8].mnemonic = 0;
 415         flowc->mnemval[8].val = 0;
 416         for (i = 0; i < 9; i++) {
 417                 flowc->mnemval[i].r4[0] = 0;
 418                 flowc->mnemval[i].r4[1] = 0;
 419                 flowc->mnemval[i].r4[2] = 0;
 420         }
 421         set_queue(skb, CPL_PRIORITY_DATA, csk);
 422
 423         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 424                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 425                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 426                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 427                 csk->advmss);
 428
 429         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 430 }
 431
 432 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 433                                    int dlen, int len, u32 credits, int compl)
 434 {
 435         struct fw_ofld_tx_data_wr *req;
 436         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 437         unsigned int wr_ulp_mode = 0;
 438
 439         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 440
 441         if (is_ofld_imm(skb)) {
 442                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 443                                         FW_WR_COMPL(1) |
 444                                         FW_WR_IMMDLEN(dlen));
 445                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
 446                                                 FW_WR_LEN16(credits));
 447         } else {
 448                 req->op_to_immdlen =
 449                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 450                                         FW_WR_COMPL(1) |
 451                                         FW_WR_IMMDLEN(0));
 452                 req->flowid_len16 =
 453                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
 454                                         FW_WR_LEN16(credits));
 455         }
 456         if (submode)
 457                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
 458                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
 459         req->tunnel_to_proxy = htonl(wr_ulp_mode) |
 460                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1);
 461         req->plen = htonl(len);
 462         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 463                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 464 }
 465
 466 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 467 {
 468         kfree_skb(skb);
 469 }
 470
 471 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 472 {
 473         int total_size = 0;
 474         struct sk_buff *skb;
 475
 476         if (unlikely(csk->state < CTP_ESTABLISHED ||
 477                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 478                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 479                          1 << CXGBI_DBG_PDU_TX,
 480                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 481                         csk, csk->state, csk->flags, csk->tid);
 482                 return 0;
 483         }
 484
 485         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 486                 int dlen = skb->len;
 487                 int len = skb->len;
 488                 unsigned int credits_needed;
 489
 490                 skb_reset_transport_header(skb);
 491                 if (is_ofld_imm(skb))
 492                         credits_needed = DIV_ROUND_UP(dlen +
 493                                         sizeof(struct fw_ofld_tx_data_wr), 16);
 494                 else
 495                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
 496                                         + sizeof(struct fw_ofld_tx_data_wr),
 497                                         16);
 498
 499                 if (csk->wr_cred < credits_needed) {
 500                         log_debug(1 << CXGBI_DBG_PDU_TX,
 501                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 502                                 csk, skb->len, skb->data_len,
 503                                 credits_needed, csk->wr_cred);
 504                         break;
 505                 }
 506                 __skb_unlink(skb, &csk->write_queue);
 507                 set_queue(skb, CPL_PRIORITY_DATA, csk);
 508                 skb->csum = credits_needed;
 509                 csk->wr_cred -= credits_needed;
 510                 csk->wr_una_cred += credits_needed;
 511                 cxgbi_sock_enqueue_wr(csk, skb);
 512
 513                 log_debug(1 << CXGBI_DBG_PDU_TX,
 514                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 515                         csk, skb->len, skb->data_len, credits_needed,
 516                         csk->wr_cred, csk->wr_una_cred);
 517
 518                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 519                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 520                                 send_tx_flowc_wr(csk);
 521                                 skb->csum += 5;
 522                                 csk->wr_cred -= 5;
 523                                 csk->wr_una_cred += 5;
 524                         }
 525                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 526                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 527                                         req_completion);
 528                         csk->snd_nxt += len;
 529                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 530                 }
 531                 total_size += skb->truesize;
 532                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 533
 534                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 535                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 536                         csk, csk->state, csk->flags, csk->tid, skb, len);
 537
 538                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 539         }
 540         return total_size;
 541 }
 542
 543 static inline void free_atid(struct cxgbi_sock *csk)
 544 {
 545         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 546
 547         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 548                 cxgb4_free_atid(lldi->tids, csk->atid);
 549                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 550                 cxgbi_sock_put(csk);
 551         }
 552 }
 553
 554 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 555 {
 556         struct cxgbi_sock *csk;
 557         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 558         unsigned short tcp_opt = ntohs(req->tcp_opt);
 559         unsigned int tid = GET_TID(req);
 560         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 561         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 562         struct tid_info *t = lldi->tids;
 563         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 564
 565         csk = lookup_atid(t, atid);
 566         if (unlikely(!csk)) {
 567                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 568                 goto rel_skb;
 569         }
 570
 571         if (csk->atid != atid) {
 572                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 573                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 574                 goto rel_skb;
 575         }
 576
 577         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 578                 "csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
 579                 csk, csk->state, csk->flags, tid, atid, rcv_isn);
 580
 581         cxgbi_sock_get(csk);
 582         csk->tid = tid;
 583         cxgb4_insert_tid(lldi->tids, csk, tid);
 584         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 585
 586         free_atid(csk);
 587
 588         spin_lock_bh(&csk->lock);
 589         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 590                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 591                         csk, csk->state, csk->flags, csk->tid);
 592
 593         if (csk->retry_timer.function) {
 594                 del_timer(&csk->retry_timer);
 595                 csk->retry_timer.function = NULL;
 596         }
 597
 598         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 599         /*
 600          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 601          * pass through opt0.
 602          */
 603         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 604                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 605
 606         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 607         if (GET_TCPOPT_TSTAMP(tcp_opt))
 608                 csk->advmss -= 12;
 609         if (csk->advmss < 128)
 610                 csk->advmss = 128;
 611
 612         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 613                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 614                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 615
 616         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 617
 618         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 619                 send_abort_req(csk);
 620         else {
 621                 if (skb_queue_len(&csk->write_queue))
 622                         push_tx_frames(csk, 0);
 623                 cxgbi_conn_tx_open(csk);
 624         }
 625         spin_unlock_bh(&csk->lock);
 626
 627 rel_skb:
 628         __kfree_skb(skb);
 629 }
 630
 631 static int act_open_rpl_status_to_errno(int status)
 632 {
 633         switch (status) {
 634         case CPL_ERR_CONN_RESET:
 635                 return -ECONNREFUSED;
 636         case CPL_ERR_ARP_MISS:
 637                 return -EHOSTUNREACH;
 638         case CPL_ERR_CONN_TIMEDOUT:
 639                 return -ETIMEDOUT;
 640         case CPL_ERR_TCAM_FULL:
 641                 return -ENOMEM;
 642         case CPL_ERR_CONN_EXIST:
 643                 return -EADDRINUSE;
 644         default:
 645                 return -EIO;
 646         }
 647 }
 648
 649 static void csk_act_open_retry_timer(unsigned long data)
 650 {
 651         struct sk_buff *skb;
 652         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 653
 654         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 655                 "csk 0x%p,%u,0x%lx,%u.\n",
 656                 csk, csk->state, csk->flags, csk->tid);
 657
 658         cxgbi_sock_get(csk);
 659         spin_lock_bh(&csk->lock);
 660         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 661         if (!skb)
 662                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 663         else {
 664                 skb->sk = (struct sock *)csk;
 665                 t4_set_arp_err_handler(skb, csk,
 666                                         cxgbi_sock_act_open_req_arp_failure);
 667                 send_act_open_req(csk, skb, csk->l2t);
 668         }
 669         spin_unlock_bh(&csk->lock);
 670         cxgbi_sock_put(csk);
 671 }
 672
 673 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 674 {
 675         struct cxgbi_sock *csk;
 676         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 677         unsigned int tid = GET_TID(rpl);
 678         unsigned int atid =
 679                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 680         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 681         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 682         struct tid_info *t = lldi->tids;
 683
 684         csk = lookup_atid(t, atid);
 685         if (unlikely(!csk)) {
 686                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 687                 goto rel_skb;
 688         }
 689
 690         pr_info("%pI4:%u-%pI4:%u, atid %u,%u, status %u, csk 0x%p,%u,0x%lx.\n",
 691                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 692                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port),
 693                 atid, tid, status, csk, csk->state, csk->flags);
 694
 695         if (status && status != CPL_ERR_TCAM_FULL &&
 696             status != CPL_ERR_CONN_EXIST &&
 697             status != CPL_ERR_ARP_MISS)
 698                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 699
 700         cxgbi_sock_get(csk);
 701         spin_lock_bh(&csk->lock);
 702
 703         if (status == CPL_ERR_CONN_EXIST &&
 704             csk->retry_timer.function != csk_act_open_retry_timer) {
 705                 csk->retry_timer.function = csk_act_open_retry_timer;
 706                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 707         } else
 708                 cxgbi_sock_fail_act_open(csk,
 709                                         act_open_rpl_status_to_errno(status));
 710
 711         spin_unlock_bh(&csk->lock);
 712         cxgbi_sock_put(csk);
 713 rel_skb:
 714         __kfree_skb(skb);
 715 }
 716
 717 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 718 {
 719         struct cxgbi_sock *csk;
 720         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 721         unsigned int tid = GET_TID(req);
 722         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 723         struct tid_info *t = lldi->tids;
 724
 725         csk = lookup_tid(t, tid);
 726         if (unlikely(!csk)) {
 727                 pr_err("can't find connection for tid %u.\n", tid);
 728                 goto rel_skb;
 729         }
 730         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 731                 "csk 0x%p,%u,0x%lx,%u.\n",
 732                 csk, csk->state, csk->flags, csk->tid);
 733         cxgbi_sock_rcv_peer_close(csk);
 734 rel_skb:
 735         __kfree_skb(skb);
 736 }
 737
 738 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 739 {
 740         struct cxgbi_sock *csk;
 741         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 742         unsigned int tid = GET_TID(rpl);
 743         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 744         struct tid_info *t = lldi->tids;
 745
 746         csk = lookup_tid(t, tid);
 747         if (unlikely(!csk)) {
 748                 pr_err("can't find connection for tid %u.\n", tid);
 749                 goto rel_skb;
 750         }
 751         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 752                 "csk 0x%p,%u,0x%lx,%u.\n",
 753                 csk, csk->state, csk->flags, csk->tid);
 754         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 755 rel_skb:
 756         __kfree_skb(skb);
 757 }
 758
 759 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 760                                                                 int *need_rst)
 761 {
 762         switch (abort_reason) {
 763         case CPL_ERR_BAD_SYN: /* fall through */
 764         case CPL_ERR_CONN_RESET:
 765                 return csk->state > CTP_ESTABLISHED ?
 766                         -EPIPE : -ECONNRESET;
 767         case CPL_ERR_XMIT_TIMEDOUT:
 768         case CPL_ERR_PERSIST_TIMEDOUT:
 769         case CPL_ERR_FINWAIT2_TIMEDOUT:
 770         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 771                 return -ETIMEDOUT;
 772         default:
 773                 return -EIO;
 774         }
 775 }
 776
 777 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 778 {
 779         struct cxgbi_sock *csk;
 780         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 781         unsigned int tid = GET_TID(req);
 782         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 783         struct tid_info *t = lldi->tids;
 784         int rst_status = CPL_ABORT_NO_RST;
 785
 786         csk = lookup_tid(t, tid);
 787         if (unlikely(!csk)) {
 788                 pr_err("can't find connection for tid %u.\n", tid);
 789                 goto rel_skb;
 790         }
 791
 792         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 793                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
 794                 csk, csk->state, csk->flags, csk->tid, req->status);
 795
 796         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 797             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 798                 goto rel_skb;
 799
 800         cxgbi_sock_get(csk);
 801         spin_lock_bh(&csk->lock);
 802
 803         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 804                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 805                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 806                 goto done;
 807         }
 808
 809         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 810         send_abort_rpl(csk, rst_status);
 811
 812         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 813                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 814                 cxgbi_sock_closed(csk);
 815         }
 816 done:
 817         spin_unlock_bh(&csk->lock);
 818         cxgbi_sock_put(csk);
 819 rel_skb:
 820         __kfree_skb(skb);
 821 }
 822
 823 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 824 {
 825         struct cxgbi_sock *csk;
 826         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 827         unsigned int tid = GET_TID(rpl);
 828         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 829         struct tid_info *t = lldi->tids;
 830
 831         csk = lookup_tid(t, tid);
 832         if (!csk)
 833                 goto rel_skb;
 834
 835         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 836                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 837                 rpl->status, csk, csk ? csk->state : 0,
 838                 csk ? csk->flags : 0UL);
 839
 840         if (rpl->status == CPL_ERR_ABORT_FAILED)
 841                 goto rel_skb;
 842
 843         cxgbi_sock_rcv_abort_rpl(csk);
 844 rel_skb:
 845         __kfree_skb(skb);
 846 }
 847
 848 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 849 {
 850         struct cxgbi_sock *csk;
 851         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 852         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 853         unsigned int tid = GET_TID(cpl);
 854         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 855         struct tid_info *t = lldi->tids;
 856
 857         csk = lookup_tid(t, tid);
 858         if (unlikely(!csk)) {
 859                 pr_err("can't find conn. for tid %u.\n", tid);
 860                 goto rel_skb;
 861         }
 862
 863         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 864                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
 865                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
 866                 pdu_len_ddp);
 867
 868         spin_lock_bh(&csk->lock);
 869
 870         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 871                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 872                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 873                         csk, csk->state, csk->flags, csk->tid);
 874                 if (csk->state != CTP_ABORTING)
 875                         goto abort_conn;
 876                 else
 877                         goto discard;
 878         }
 879
 880         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
 881         cxgbi_skcb_flags(skb) = 0;
 882
 883         skb_reset_transport_header(skb);
 884         __skb_pull(skb, sizeof(*cpl));
 885         __pskb_trim(skb, ntohs(cpl->len));
 886
 887         if (!csk->skb_ulp_lhdr) {
 888                 unsigned char *bhs;
 889                 unsigned int hlen, dlen;
 890
 891                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 892                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
 893                         csk, csk->state, csk->flags, csk->tid, skb);
 894                 csk->skb_ulp_lhdr = skb;
 895                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
 896
 897                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
 898                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
 899                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
 900                                 csk->rcv_nxt);
 901                         goto abort_conn;
 902                 }
 903
 904                 bhs = skb->data;
 905                 hlen = ntohs(cpl->len);
 906                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
 907
 908                 if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
 909                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
 910                                 "mismatch %u != %u + %u, seq 0x%x.\n",
 911                                 csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
 912                                 hlen, dlen, cxgbi_skcb_tcp_seq(skb));
 913                         goto abort_conn;
 914                 }
 915
 916                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
 917                 if (dlen)
 918                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
 919                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
 920
 921                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 922                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
 923                         csk, skb, *bhs, hlen, dlen,
 924                         ntohl(*((unsigned int *)(bhs + 16))),
 925                         ntohl(*((unsigned int *)(bhs + 24))));
 926
 927         } else {
 928                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
 929
 930                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
 931                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 932                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
 933                         csk, csk->state, csk->flags, skb, lskb);
 934         }
 935
 936         __skb_queue_tail(&csk->receive_queue, skb);
 937         spin_unlock_bh(&csk->lock);
 938         return;
 939
 940 abort_conn:
 941         send_abort_req(csk);
 942 discard:
 943         spin_unlock_bh(&csk->lock);
 944 rel_skb:
 945         __kfree_skb(skb);
 946 }
 947
 948 static void do_rx_data_ddp(struct cxgbi_device *cdev,
 949                                   struct sk_buff *skb)
 950 {
 951         struct cxgbi_sock *csk;
 952         struct sk_buff *lskb;
 953         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
 954         unsigned int tid = GET_TID(rpl);
 955         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 956         struct tid_info *t = lldi->tids;
 957         unsigned int status = ntohl(rpl->ddpvld);
 958
 959         csk = lookup_tid(t, tid);
 960         if (unlikely(!csk)) {
 961                 pr_err("can't find connection for tid %u.\n", tid);
 962                 goto rel_skb;
 963         }
 964
 965         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 966                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
 967                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
 968
 969         spin_lock_bh(&csk->lock);
 970
 971         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 972                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 973                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 974                         csk, csk->state, csk->flags, csk->tid);
 975                 if (csk->state != CTP_ABORTING)
 976                         goto abort_conn;
 977                 else
 978                         goto discard;
 979         }
 980
 981         if (!csk->skb_ulp_lhdr) {
 982                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
 983                 goto abort_conn;
 984         }
 985
 986         lskb = csk->skb_ulp_lhdr;
 987         csk->skb_ulp_lhdr = NULL;
 988
 989         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
 990
 991         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
 992                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
 993                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
 994
 995         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
 996                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
 997                         csk, lskb, status, cxgbi_skcb_flags(lskb));
 998                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
 999         }
1000         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1001                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1002                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1003                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1004         }
1005         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1006                 log_debug(1 << CXGBI_DBG_PDU_RX,
1007                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1008                         csk, lskb, status);
1009                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1010         }
1011         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1012                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1013                 log_debug(1 << CXGBI_DBG_PDU_RX,
1014                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1015                         csk, lskb, status);
1016                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1017         }
1018         log_debug(1 << CXGBI_DBG_PDU_RX,
1019                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1020                 csk, lskb, cxgbi_skcb_flags(lskb));
1021
1022         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1023         cxgbi_conn_pdu_ready(csk);
1024         spin_unlock_bh(&csk->lock);
1025         goto rel_skb;
1026
1027 abort_conn:
1028         send_abort_req(csk);
1029 discard:
1030         spin_unlock_bh(&csk->lock);
1031 rel_skb:
1032         __kfree_skb(skb);
1033 }
1034
1035 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1036 {
1037         struct cxgbi_sock *csk;
1038         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1039         unsigned int tid = GET_TID(rpl);
1040         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1041         struct tid_info *t = lldi->tids;
1042
1043         csk = lookup_tid(t, tid);
1044         if (unlikely(!csk))
1045                 pr_err("can't find connection for tid %u.\n", tid);
1046         else {
1047                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1048                         "csk 0x%p,%u,0x%lx,%u.\n",
1049                         csk, csk->state, csk->flags, csk->tid);
1050                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1051                                         rpl->seq_vld);
1052         }
1053         __kfree_skb(skb);
1054 }
1055
1056 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1057 {
1058         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1059         unsigned int tid = GET_TID(rpl);
1060         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1061         struct tid_info *t = lldi->tids;
1062         struct cxgbi_sock *csk;
1063
1064         csk = lookup_tid(t, tid);
1065         if (!csk)
1066                 pr_err("can't find conn. for tid %u.\n", tid);
1067
1068         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1069                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1070                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1071
1072         if (rpl->status != CPL_ERR_NONE)
1073                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1074                         csk, tid, rpl->status);
1075
1076         __kfree_skb(skb);
1077 }
1078
1079 static int alloc_cpls(struct cxgbi_sock *csk)
1080 {
1081         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1082                                         0, GFP_KERNEL);
1083         if (!csk->cpl_close)
1084                 return -ENOMEM;
1085
1086         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1087                                         0, GFP_KERNEL);
1088         if (!csk->cpl_abort_req)
1089                 goto free_cpls;
1090
1091         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1092                                         0, GFP_KERNEL);
1093         if (!csk->cpl_abort_rpl)
1094                 goto free_cpls;
1095         return 0;
1096
1097 free_cpls:
1098         cxgbi_sock_free_cpl_skbs(csk);
1099         return -ENOMEM;
1100 }
1101
1102 static inline void l2t_put(struct cxgbi_sock *csk)
1103 {
1104         if (csk->l2t) {
1105                 cxgb4_l2t_release(csk->l2t);
1106                 csk->l2t = NULL;
1107                 cxgbi_sock_put(csk);
1108         }
1109 }
1110
1111 static void release_offload_resources(struct cxgbi_sock *csk)
1112 {
1113         struct cxgb4_lld_info *lldi;
1114
1115         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1116                 "csk 0x%p,%u,0x%lx,%u.\n",
1117                 csk, csk->state, csk->flags, csk->tid);
1118
1119         cxgbi_sock_free_cpl_skbs(csk);
1120         if (csk->wr_cred != csk->wr_max_cred) {
1121                 cxgbi_sock_purge_wr_queue(csk);
1122                 cxgbi_sock_reset_wr_list(csk);
1123         }
1124
1125         l2t_put(csk);
1126         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1127                 free_atid(csk);
1128         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1129                 lldi = cxgbi_cdev_priv(csk->cdev);
1130                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1131                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1132                 cxgbi_sock_put(csk);
1133         }
1134         csk->dst = NULL;
1135         csk->cdev = NULL;
1136 }
1137
1138 static int init_act_open(struct cxgbi_sock *csk)
1139 {
1140         struct cxgbi_device *cdev = csk->cdev;
1141         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1142         struct net_device *ndev = cdev->ports[csk->port_id];
1143         struct port_info *pi = netdev_priv(ndev);
1144         struct sk_buff *skb = NULL;
1145         unsigned int step;
1146
1147         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1148                 "csk 0x%p,%u,0x%lx,%u.\n",
1149                 csk, csk->state, csk->flags, csk->tid);
1150
1151         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1152         if (csk->atid < 0) {
1153                 pr_err("%s, NO atid available.\n", ndev->name);
1154                 return -EINVAL;
1155         }
1156         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1157         cxgbi_sock_get(csk);
1158
1159         csk->l2t = cxgb4_l2t_get(lldi->l2t, csk->dst->neighbour, ndev, 0);
1160         if (!csk->l2t) {
1161                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1162                 goto rel_resource;
1163         }
1164         cxgbi_sock_get(csk);
1165
1166         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1167         if (!skb)
1168                 goto rel_resource;
1169         skb->sk = (struct sock *)csk;
1170         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1171
1172         if (!csk->mtu)
1173                 csk->mtu = dst_mtu(csk->dst);
1174         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1175         csk->tx_chan = cxgb4_port_chan(ndev);
1176         /* SMT two entries per row */
1177         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1178         step = lldi->ntxq / lldi->nchan;
1179         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1180         step = lldi->nrxq / lldi->nchan;
1181         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1182         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1183         csk->wr_una_cred = 0;
1184         cxgbi_sock_reset_wr_list(csk);
1185         csk->err = 0;
1186         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1187                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1188                 csk, pi->port_id, ndev->name, csk->tx_chan,
1189                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1190                 csk->smac_idx);
1191
1192         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1193         send_act_open_req(csk, skb, csk->l2t);
1194         return 0;
1195
1196 rel_resource:
1197         if (skb)
1198                 __kfree_skb(skb);
1199         return -EINVAL;
1200 }
1201
1202 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1203         [CPL_ACT_ESTABLISH] = do_act_establish,
1204         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1205         [CPL_PEER_CLOSE] = do_peer_close,
1206         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1207         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1208         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1209         [CPL_FW4_ACK] = do_fw4_ack,
1210         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1211         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1212         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1213 };
1214
1215 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1216 {
1217         int rc;
1218
1219         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1220                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1221
1222         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1223                                         cxgb4i_max_connect);
1224         if (rc < 0)
1225                 return rc;
1226
1227         cdev->csk_release_offload_resources = release_offload_resources;
1228         cdev->csk_push_tx_frames = push_tx_frames;
1229         cdev->csk_send_abort_req = send_abort_req;
1230         cdev->csk_send_close_req = send_close_req;
1231         cdev->csk_send_rx_credits = send_rx_credits;
1232         cdev->csk_alloc_cpls = alloc_cpls;
1233         cdev->csk_init_act_open = init_act_open;
1234
1235         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1236         return 0;
1237 }
1238
1239 /*
1240  * functions to program the pagepod in h/w
1241  */
1242 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1243 static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1244                                 unsigned int wr_len, unsigned int dlen,
1245                                 unsigned int pm_addr)
1246 {
1247         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1248
1249         INIT_ULPTX_WR(req, wr_len, 0, 0);
1250         req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) | (1 << 23));
1251         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1252         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1253         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1254
1255         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1256         idata->len = htonl(dlen);
1257 }
1258
1259 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1260                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1261                                 unsigned int npods,
1262                                 struct cxgbi_gather_list *gl,
1263                                 unsigned int gl_pidx)
1264 {
1265         struct cxgbi_ddp_info *ddp = cdev->ddp;
1266         struct sk_buff *skb;
1267         struct ulp_mem_io *req;
1268         struct ulptx_idata *idata;
1269         struct cxgbi_pagepod *ppod;
1270         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1271         unsigned int dlen = PPOD_SIZE * npods;
1272         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1273                                 sizeof(struct ulptx_idata) + dlen, 16);
1274         unsigned int i;
1275
1276         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1277         if (!skb) {
1278                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1279                         cdev, idx, npods);
1280                 return -ENOMEM;
1281         }
1282         req = (struct ulp_mem_io *)skb->head;
1283         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1284
1285         ulp_mem_io_set_hdr(req, wr_len, dlen, pm_addr);
1286         idata = (struct ulptx_idata *)(req + 1);
1287         ppod = (struct cxgbi_pagepod *)(idata + 1);
1288
1289         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1290                 if (!hdr && !gl)
1291                         cxgbi_ddp_ppod_clear(ppod);
1292                 else
1293                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1294         }
1295
1296         cxgb4_ofld_send(cdev->ports[port_id], skb);
1297         return 0;
1298 }
1299
1300 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1301                         unsigned int idx, unsigned int npods,
1302                         struct cxgbi_gather_list *gl)
1303 {
1304         unsigned int i, cnt;
1305         int err = 0;
1306
1307         for (i = 0; i < npods; i += cnt, idx += cnt) {
1308                 cnt = npods - i;
1309                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1310                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1311                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1312                                         idx, cnt, gl, 4 * i);
1313                 if (err < 0)
1314                         break;
1315         }
1316         return err;
1317 }
1318
1319 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1320                           unsigned int idx, unsigned int npods)
1321 {
1322         unsigned int i, cnt;
1323         int err;
1324
1325         for (i = 0; i < npods; i += cnt, idx += cnt) {
1326                 cnt = npods - i;
1327                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1328                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1329                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1330                                         idx, cnt, NULL, 0);
1331                 if (err < 0)
1332                         break;
1333         }
1334 }
1335
1336 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1337                                 int pg_idx, bool reply)
1338 {
1339         struct sk_buff *skb;
1340         struct cpl_set_tcb_field *req;
1341
1342         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1343                 return 0;
1344
1345         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1346         if (!skb)
1347                 return -ENOMEM;
1348
1349         /*  set up ulp page size */
1350         req = (struct cpl_set_tcb_field *)skb->head;
1351         INIT_TP_WR(req, csk->tid);
1352         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1353         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1354         req->word_cookie = htons(0);
1355         req->mask = cpu_to_be64(0x3 << 8);
1356         req->val = cpu_to_be64(pg_idx << 8);
1357         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1358
1359         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1360                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1361
1362         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1363         return 0;
1364 }
1365
1366 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1367                                  int hcrc, int dcrc, int reply)
1368 {
1369         struct sk_buff *skb;
1370         struct cpl_set_tcb_field *req;
1371
1372         if (!hcrc && !dcrc)
1373                 return 0;
1374
1375         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1376         if (!skb)
1377                 return -ENOMEM;
1378
1379         csk->hcrc_len = (hcrc ? 4 : 0);
1380         csk->dcrc_len = (dcrc ? 4 : 0);
1381         /*  set up ulp submode */
1382         req = (struct cpl_set_tcb_field *)skb->head;
1383         INIT_TP_WR(req, tid);
1384         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1385         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1386         req->word_cookie = htons(0);
1387         req->mask = cpu_to_be64(0x3 << 4);
1388         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1389                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1390         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1391
1392         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1393                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1394
1395         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1396         return 0;
1397 }
1398
1399 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1400 {
1401         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1402         struct cxgbi_ddp_info *ddp = cdev->ddp;
1403         unsigned int tagmask, pgsz_factor[4];
1404         int err;
1405
1406         if (ddp) {
1407                 kref_get(&ddp->refcnt);
1408                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1409                         cdev, cdev->ddp);
1410                 return -EALREADY;
1411         }
1412
1413         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1414                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1415                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1416         if (err < 0)
1417                 return err;
1418
1419         ddp = cdev->ddp;
1420
1421         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1422         cxgbi_ddp_page_size_factor(pgsz_factor);
1423         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1424
1425         cdev->csk_ddp_free_gl_skb = NULL;
1426         cdev->csk_ddp_alloc_gl_skb = NULL;
1427         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1428         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1429         cdev->csk_ddp_set = ddp_set_map;
1430         cdev->csk_ddp_clear = ddp_clear_map;
1431
1432         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1433                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1434                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1435         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1436                 " %u/%u.\n",
1437                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1438                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1439                 ddp->max_rxsz, lldi->iscsi_iolen);
1440         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1441                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1442                 ddp->max_rxsz);
1443         return 0;
1444 }
1445
1446 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1447 {
1448         struct cxgbi_device *cdev;
1449         struct port_info *pi;
1450         int i, rc;
1451
1452         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1453         if (!cdev) {
1454                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1455                 return NULL;
1456         }
1457         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1458                 cdev, lldi->adapter_type, lldi->nports,
1459                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1460                 lldi->nrxq, lldi->wr_cred);
1461         for (i = 0; i < lldi->nrxq; i++)
1462                 log_debug(1 << CXGBI_DBG_DEV,
1463                         "t4 0x%p, rxq id #%d: %u.\n",
1464                         cdev, i, lldi->rxq_ids[i]);
1465
1466         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1467         cdev->flags = CXGBI_FLAG_DEV_T4;
1468         cdev->pdev = lldi->pdev;
1469         cdev->ports = lldi->ports;
1470         cdev->nports = lldi->nports;
1471         cdev->mtus = lldi->mtus;
1472         cdev->nmtus = NMTUS;
1473         cdev->snd_win = cxgb4i_snd_win;
1474         cdev->rcv_win = cxgb4i_rcv_win;
1475         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1476         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1477         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1478         cdev->itp = &cxgb4i_iscsi_transport;
1479
1480         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1481         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1482                 cdev, lldi->ports[0]->name, cdev->pfvf);
1483
1484         rc = cxgb4i_ddp_init(cdev);
1485         if (rc) {
1486                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1487                 goto err_out;
1488         }
1489         rc = cxgb4i_ofld_init(cdev);
1490         if (rc) {
1491                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1492                 goto err_out;
1493         }
1494
1495         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1496                                 &cxgb4i_host_template, cxgb4i_stt);
1497         if (rc)
1498                 goto err_out;
1499
1500         for (i = 0; i < cdev->nports; i++) {
1501                 pi = netdev_priv(lldi->ports[i]);
1502                 cdev->hbas[i]->port_id = pi->port_id;
1503         }
1504         return cdev;
1505
1506 err_out:
1507         cxgbi_device_unregister(cdev);
1508         return ERR_PTR(-ENOMEM);
1509 }
1510
1511 #define RX_PULL_LEN     128
1512 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1513                                 const struct pkt_gl *pgl)
1514 {
1515         const struct cpl_act_establish *rpl;
1516         struct sk_buff *skb;
1517         unsigned int opc;
1518         struct cxgbi_device *cdev = handle;
1519
1520         if (pgl == NULL) {
1521                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1522
1523                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1524                 if (!skb)
1525                         goto nomem;
1526                 skb_copy_to_linear_data(skb, &rsp[1], len);
1527         } else {
1528                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1529                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1530                                 pgl->va, be64_to_cpu(*rsp),
1531                                 be64_to_cpu(*(u64 *)pgl->va),
1532                                 pgl->tot_len);
1533                         return 0;
1534                 }
1535                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1536                 if (unlikely(!skb))
1537                         goto nomem;
1538         }
1539
1540         rpl = (struct cpl_act_establish *)skb->data;
1541         opc = rpl->ot.opcode;
1542         log_debug(1 << CXGBI_DBG_TOE,
1543                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1544                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1545         if (cxgb4i_cplhandlers[opc])
1546                 cxgb4i_cplhandlers[opc](cdev, skb);
1547         else {
1548                 pr_err("No handler for opcode 0x%x.\n", opc);
1549                 __kfree_skb(skb);
1550         }
1551         return 0;
1552 nomem:
1553         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1554         return 1;
1555 }
1556
1557 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1558 {
1559         struct cxgbi_device *cdev = handle;
1560
1561         switch (state) {
1562         case CXGB4_STATE_UP:
1563                 pr_info("cdev 0x%p, UP.\n", cdev);
1564                 /* re-initialize */
1565                 break;
1566         case CXGB4_STATE_START_RECOVERY:
1567                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1568                 /* close all connections */
1569                 break;
1570         case CXGB4_STATE_DOWN:
1571                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1572                 break;
1573         case CXGB4_STATE_DETACH:
1574                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1575                 break;
1576         default:
1577                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1578                 break;
1579         }
1580         return 0;
1581 }
1582
1583 static int __init cxgb4i_init_module(void)
1584 {
1585         int rc;
1586
1587         printk(KERN_INFO "%s", version);
1588
1589         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1590         if (rc < 0)
1591                 return rc;
1592         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1593         return 0;
1594 }
1595
1596 static void __exit cxgb4i_exit_module(void)
1597 {
1598         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1599         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1600         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1601 }
1602
1603 module_init(cxgb4i_init_module);
1604 module_exit(cxgb4i_exit_module);