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 == CPL_ERR_RTX_NEG_ADVICE)
 696                 goto rel_skb;
 697
 698         if (status && status != CPL_ERR_TCAM_FULL &&
 699             status != CPL_ERR_CONN_EXIST &&
 700             status != CPL_ERR_ARP_MISS)
 701                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 702
 703         cxgbi_sock_get(csk);
 704         spin_lock_bh(&csk->lock);
 705
 706         if (status == CPL_ERR_CONN_EXIST &&
 707             csk->retry_timer.function != csk_act_open_retry_timer) {
 708                 csk->retry_timer.function = csk_act_open_retry_timer;
 709                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 710         } else
 711                 cxgbi_sock_fail_act_open(csk,
 712                                         act_open_rpl_status_to_errno(status));
 713
 714         spin_unlock_bh(&csk->lock);
 715         cxgbi_sock_put(csk);
 716 rel_skb:
 717         __kfree_skb(skb);
 718 }
 719
 720 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 721 {
 722         struct cxgbi_sock *csk;
 723         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 724         unsigned int tid = GET_TID(req);
 725         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 726         struct tid_info *t = lldi->tids;
 727
 728         csk = lookup_tid(t, tid);
 729         if (unlikely(!csk)) {
 730                 pr_err("can't find connection for tid %u.\n", tid);
 731                 goto rel_skb;
 732         }
 733         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 734                 "csk 0x%p,%u,0x%lx,%u.\n",
 735                 csk, csk->state, csk->flags, csk->tid);
 736         cxgbi_sock_rcv_peer_close(csk);
 737 rel_skb:
 738         __kfree_skb(skb);
 739 }
 740
 741 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 742 {
 743         struct cxgbi_sock *csk;
 744         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 745         unsigned int tid = GET_TID(rpl);
 746         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 747         struct tid_info *t = lldi->tids;
 748
 749         csk = lookup_tid(t, tid);
 750         if (unlikely(!csk)) {
 751                 pr_err("can't find connection for tid %u.\n", tid);
 752                 goto rel_skb;
 753         }
 754         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 755                 "csk 0x%p,%u,0x%lx,%u.\n",
 756                 csk, csk->state, csk->flags, csk->tid);
 757         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 758 rel_skb:
 759         __kfree_skb(skb);
 760 }
 761
 762 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 763                                                                 int *need_rst)
 764 {
 765         switch (abort_reason) {
 766         case CPL_ERR_BAD_SYN: /* fall through */
 767         case CPL_ERR_CONN_RESET:
 768                 return csk->state > CTP_ESTABLISHED ?
 769                         -EPIPE : -ECONNRESET;
 770         case CPL_ERR_XMIT_TIMEDOUT:
 771         case CPL_ERR_PERSIST_TIMEDOUT:
 772         case CPL_ERR_FINWAIT2_TIMEDOUT:
 773         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 774                 return -ETIMEDOUT;
 775         default:
 776                 return -EIO;
 777         }
 778 }
 779
 780 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 781 {
 782         struct cxgbi_sock *csk;
 783         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 784         unsigned int tid = GET_TID(req);
 785         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 786         struct tid_info *t = lldi->tids;
 787         int rst_status = CPL_ABORT_NO_RST;
 788
 789         csk = lookup_tid(t, tid);
 790         if (unlikely(!csk)) {
 791                 pr_err("can't find connection for tid %u.\n", tid);
 792                 goto rel_skb;
 793         }
 794
 795         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 796                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
 797                 csk, csk->state, csk->flags, csk->tid, req->status);
 798
 799         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 800             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 801                 goto rel_skb;
 802
 803         cxgbi_sock_get(csk);
 804         spin_lock_bh(&csk->lock);
 805
 806         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 807                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 808                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 809                 goto done;
 810         }
 811
 812         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 813         send_abort_rpl(csk, rst_status);
 814
 815         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 816                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 817                 cxgbi_sock_closed(csk);
 818         }
 819 done:
 820         spin_unlock_bh(&csk->lock);
 821         cxgbi_sock_put(csk);
 822 rel_skb:
 823         __kfree_skb(skb);
 824 }
 825
 826 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 827 {
 828         struct cxgbi_sock *csk;
 829         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 830         unsigned int tid = GET_TID(rpl);
 831         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 832         struct tid_info *t = lldi->tids;
 833
 834         csk = lookup_tid(t, tid);
 835         if (!csk)
 836                 goto rel_skb;
 837
 838         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 839                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 840                 rpl->status, csk, csk ? csk->state : 0,
 841                 csk ? csk->flags : 0UL);
 842
 843         if (rpl->status == CPL_ERR_ABORT_FAILED)
 844                 goto rel_skb;
 845
 846         cxgbi_sock_rcv_abort_rpl(csk);
 847 rel_skb:
 848         __kfree_skb(skb);
 849 }
 850
 851 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 852 {
 853         struct cxgbi_sock *csk;
 854         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 855         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 856         unsigned int tid = GET_TID(cpl);
 857         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 858         struct tid_info *t = lldi->tids;
 859
 860         csk = lookup_tid(t, tid);
 861         if (unlikely(!csk)) {
 862                 pr_err("can't find conn. for tid %u.\n", tid);
 863                 goto rel_skb;
 864         }
 865
 866         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 867                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
 868                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
 869                 pdu_len_ddp);
 870
 871         spin_lock_bh(&csk->lock);
 872
 873         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 874                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 875                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 876                         csk, csk->state, csk->flags, csk->tid);
 877                 if (csk->state != CTP_ABORTING)
 878                         goto abort_conn;
 879                 else
 880                         goto discard;
 881         }
 882
 883         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
 884         cxgbi_skcb_flags(skb) = 0;
 885
 886         skb_reset_transport_header(skb);
 887         __skb_pull(skb, sizeof(*cpl));
 888         __pskb_trim(skb, ntohs(cpl->len));
 889
 890         if (!csk->skb_ulp_lhdr) {
 891                 unsigned char *bhs;
 892                 unsigned int hlen, dlen;
 893
 894                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 895                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
 896                         csk, csk->state, csk->flags, csk->tid, skb);
 897                 csk->skb_ulp_lhdr = skb;
 898                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
 899
 900                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
 901                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
 902                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
 903                                 csk->rcv_nxt);
 904                         goto abort_conn;
 905                 }
 906
 907                 bhs = skb->data;
 908                 hlen = ntohs(cpl->len);
 909                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
 910
 911                 if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
 912                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
 913                                 "mismatch %u != %u + %u, seq 0x%x.\n",
 914                                 csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
 915                                 hlen, dlen, cxgbi_skcb_tcp_seq(skb));
 916                         goto abort_conn;
 917                 }
 918
 919                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
 920                 if (dlen)
 921                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
 922                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
 923
 924                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 925                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
 926                         csk, skb, *bhs, hlen, dlen,
 927                         ntohl(*((unsigned int *)(bhs + 16))),
 928                         ntohl(*((unsigned int *)(bhs + 24))));
 929
 930         } else {
 931                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
 932
 933                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
 934                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 935                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
 936                         csk, csk->state, csk->flags, skb, lskb);
 937         }
 938
 939         __skb_queue_tail(&csk->receive_queue, skb);
 940         spin_unlock_bh(&csk->lock);
 941         return;
 942
 943 abort_conn:
 944         send_abort_req(csk);
 945 discard:
 946         spin_unlock_bh(&csk->lock);
 947 rel_skb:
 948         __kfree_skb(skb);
 949 }
 950
 951 static void do_rx_data_ddp(struct cxgbi_device *cdev,
 952                                   struct sk_buff *skb)
 953 {
 954         struct cxgbi_sock *csk;
 955         struct sk_buff *lskb;
 956         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
 957         unsigned int tid = GET_TID(rpl);
 958         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 959         struct tid_info *t = lldi->tids;
 960         unsigned int status = ntohl(rpl->ddpvld);
 961
 962         csk = lookup_tid(t, tid);
 963         if (unlikely(!csk)) {
 964                 pr_err("can't find connection for tid %u.\n", tid);
 965                 goto rel_skb;
 966         }
 967
 968         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 969                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
 970                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
 971
 972         spin_lock_bh(&csk->lock);
 973
 974         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 975                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 976                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 977                         csk, csk->state, csk->flags, csk->tid);
 978                 if (csk->state != CTP_ABORTING)
 979                         goto abort_conn;
 980                 else
 981                         goto discard;
 982         }
 983
 984         if (!csk->skb_ulp_lhdr) {
 985                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
 986                 goto abort_conn;
 987         }
 988
 989         lskb = csk->skb_ulp_lhdr;
 990         csk->skb_ulp_lhdr = NULL;
 991
 992         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
 993
 994         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
 995                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
 996                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
 997
 998         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
 999                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1000                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1001                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1002         }
1003         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1004                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1005                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1006                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1007         }
1008         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1009                 log_debug(1 << CXGBI_DBG_PDU_RX,
1010                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1011                         csk, lskb, status);
1012                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1013         }
1014         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1015                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1016                 log_debug(1 << CXGBI_DBG_PDU_RX,
1017                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1018                         csk, lskb, status);
1019                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1020         }
1021         log_debug(1 << CXGBI_DBG_PDU_RX,
1022                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1023                 csk, lskb, cxgbi_skcb_flags(lskb));
1024
1025         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1026         cxgbi_conn_pdu_ready(csk);
1027         spin_unlock_bh(&csk->lock);
1028         goto rel_skb;
1029
1030 abort_conn:
1031         send_abort_req(csk);
1032 discard:
1033         spin_unlock_bh(&csk->lock);
1034 rel_skb:
1035         __kfree_skb(skb);
1036 }
1037
1038 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1039 {
1040         struct cxgbi_sock *csk;
1041         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1042         unsigned int tid = GET_TID(rpl);
1043         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1044         struct tid_info *t = lldi->tids;
1045
1046         csk = lookup_tid(t, tid);
1047         if (unlikely(!csk))
1048                 pr_err("can't find connection for tid %u.\n", tid);
1049         else {
1050                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1051                         "csk 0x%p,%u,0x%lx,%u.\n",
1052                         csk, csk->state, csk->flags, csk->tid);
1053                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1054                                         rpl->seq_vld);
1055         }
1056         __kfree_skb(skb);
1057 }
1058
1059 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1060 {
1061         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1062         unsigned int tid = GET_TID(rpl);
1063         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1064         struct tid_info *t = lldi->tids;
1065         struct cxgbi_sock *csk;
1066
1067         csk = lookup_tid(t, tid);
1068         if (!csk)
1069                 pr_err("can't find conn. for tid %u.\n", tid);
1070
1071         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1072                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1073                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1074
1075         if (rpl->status != CPL_ERR_NONE)
1076                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1077                         csk, tid, rpl->status);
1078
1079         __kfree_skb(skb);
1080 }
1081
1082 static int alloc_cpls(struct cxgbi_sock *csk)
1083 {
1084         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1085                                         0, GFP_KERNEL);
1086         if (!csk->cpl_close)
1087                 return -ENOMEM;
1088
1089         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1090                                         0, GFP_KERNEL);
1091         if (!csk->cpl_abort_req)
1092                 goto free_cpls;
1093
1094         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1095                                         0, GFP_KERNEL);
1096         if (!csk->cpl_abort_rpl)
1097                 goto free_cpls;
1098         return 0;
1099
1100 free_cpls:
1101         cxgbi_sock_free_cpl_skbs(csk);
1102         return -ENOMEM;
1103 }
1104
1105 static inline void l2t_put(struct cxgbi_sock *csk)
1106 {
1107         if (csk->l2t) {
1108                 cxgb4_l2t_release(csk->l2t);
1109                 csk->l2t = NULL;
1110                 cxgbi_sock_put(csk);
1111         }
1112 }
1113
1114 static void release_offload_resources(struct cxgbi_sock *csk)
1115 {
1116         struct cxgb4_lld_info *lldi;
1117
1118         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1119                 "csk 0x%p,%u,0x%lx,%u.\n",
1120                 csk, csk->state, csk->flags, csk->tid);
1121
1122         cxgbi_sock_free_cpl_skbs(csk);
1123         if (csk->wr_cred != csk->wr_max_cred) {
1124                 cxgbi_sock_purge_wr_queue(csk);
1125                 cxgbi_sock_reset_wr_list(csk);
1126         }
1127
1128         l2t_put(csk);
1129         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1130                 free_atid(csk);
1131         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1132                 lldi = cxgbi_cdev_priv(csk->cdev);
1133                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1134                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1135                 cxgbi_sock_put(csk);
1136         }
1137         csk->dst = NULL;
1138         csk->cdev = NULL;
1139 }
1140
1141 static int init_act_open(struct cxgbi_sock *csk)
1142 {
1143         struct cxgbi_device *cdev = csk->cdev;
1144         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1145         struct net_device *ndev = cdev->ports[csk->port_id];
1146         struct port_info *pi = netdev_priv(ndev);
1147         struct sk_buff *skb = NULL;
1148         unsigned int step;
1149
1150         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1151                 "csk 0x%p,%u,0x%lx,%u.\n",
1152                 csk, csk->state, csk->flags, csk->tid);
1153
1154         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1155         if (csk->atid < 0) {
1156                 pr_err("%s, NO atid available.\n", ndev->name);
1157                 return -EINVAL;
1158         }
1159         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1160         cxgbi_sock_get(csk);
1161
1162         csk->l2t = cxgb4_l2t_get(lldi->l2t, csk->dst->neighbour, ndev, 0);
1163         if (!csk->l2t) {
1164                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1165                 goto rel_resource;
1166         }
1167         cxgbi_sock_get(csk);
1168
1169         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1170         if (!skb)
1171                 goto rel_resource;
1172         skb->sk = (struct sock *)csk;
1173         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1174
1175         if (!csk->mtu)
1176                 csk->mtu = dst_mtu(csk->dst);
1177         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1178         csk->tx_chan = cxgb4_port_chan(ndev);
1179         /* SMT two entries per row */
1180         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1181         step = lldi->ntxq / lldi->nchan;
1182         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1183         step = lldi->nrxq / lldi->nchan;
1184         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1185         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1186         csk->wr_una_cred = 0;
1187         cxgbi_sock_reset_wr_list(csk);
1188         csk->err = 0;
1189         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1190                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1191                 csk, pi->port_id, ndev->name, csk->tx_chan,
1192                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1193                 csk->smac_idx);
1194
1195         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1196         send_act_open_req(csk, skb, csk->l2t);
1197         return 0;
1198
1199 rel_resource:
1200         if (skb)
1201                 __kfree_skb(skb);
1202         return -EINVAL;
1203 }
1204
1205 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1206         [CPL_ACT_ESTABLISH] = do_act_establish,
1207         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1208         [CPL_PEER_CLOSE] = do_peer_close,
1209         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1210         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1211         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1212         [CPL_FW4_ACK] = do_fw4_ack,
1213         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1214         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1215         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1216 };
1217
1218 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1219 {
1220         int rc;
1221
1222         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1223                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1224
1225         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1226                                         cxgb4i_max_connect);
1227         if (rc < 0)
1228                 return rc;
1229
1230         cdev->csk_release_offload_resources = release_offload_resources;
1231         cdev->csk_push_tx_frames = push_tx_frames;
1232         cdev->csk_send_abort_req = send_abort_req;
1233         cdev->csk_send_close_req = send_close_req;
1234         cdev->csk_send_rx_credits = send_rx_credits;
1235         cdev->csk_alloc_cpls = alloc_cpls;
1236         cdev->csk_init_act_open = init_act_open;
1237
1238         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1239         return 0;
1240 }
1241
1242 /*
1243  * functions to program the pagepod in h/w
1244  */
1245 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1246 static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1247                                 unsigned int wr_len, unsigned int dlen,
1248                                 unsigned int pm_addr)
1249 {
1250         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1251
1252         INIT_ULPTX_WR(req, wr_len, 0, 0);
1253         req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) | (1 << 23));
1254         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1255         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1256         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1257
1258         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1259         idata->len = htonl(dlen);
1260 }
1261
1262 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1263                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1264                                 unsigned int npods,
1265                                 struct cxgbi_gather_list *gl,
1266                                 unsigned int gl_pidx)
1267 {
1268         struct cxgbi_ddp_info *ddp = cdev->ddp;
1269         struct sk_buff *skb;
1270         struct ulp_mem_io *req;
1271         struct ulptx_idata *idata;
1272         struct cxgbi_pagepod *ppod;
1273         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1274         unsigned int dlen = PPOD_SIZE * npods;
1275         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1276                                 sizeof(struct ulptx_idata) + dlen, 16);
1277         unsigned int i;
1278
1279         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1280         if (!skb) {
1281                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1282                         cdev, idx, npods);
1283                 return -ENOMEM;
1284         }
1285         req = (struct ulp_mem_io *)skb->head;
1286         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1287
1288         ulp_mem_io_set_hdr(req, wr_len, dlen, pm_addr);
1289         idata = (struct ulptx_idata *)(req + 1);
1290         ppod = (struct cxgbi_pagepod *)(idata + 1);
1291
1292         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1293                 if (!hdr && !gl)
1294                         cxgbi_ddp_ppod_clear(ppod);
1295                 else
1296                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1297         }
1298
1299         cxgb4_ofld_send(cdev->ports[port_id], skb);
1300         return 0;
1301 }
1302
1303 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1304                         unsigned int idx, unsigned int npods,
1305                         struct cxgbi_gather_list *gl)
1306 {
1307         unsigned int i, cnt;
1308         int err = 0;
1309
1310         for (i = 0; i < npods; i += cnt, idx += cnt) {
1311                 cnt = npods - i;
1312                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1313                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1314                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1315                                         idx, cnt, gl, 4 * i);
1316                 if (err < 0)
1317                         break;
1318         }
1319         return err;
1320 }
1321
1322 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1323                           unsigned int idx, unsigned int npods)
1324 {
1325         unsigned int i, cnt;
1326         int err;
1327
1328         for (i = 0; i < npods; i += cnt, idx += cnt) {
1329                 cnt = npods - i;
1330                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1331                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1332                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1333                                         idx, cnt, NULL, 0);
1334                 if (err < 0)
1335                         break;
1336         }
1337 }
1338
1339 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1340                                 int pg_idx, bool reply)
1341 {
1342         struct sk_buff *skb;
1343         struct cpl_set_tcb_field *req;
1344
1345         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1346                 return 0;
1347
1348         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1349         if (!skb)
1350                 return -ENOMEM;
1351
1352         /*  set up ulp page size */
1353         req = (struct cpl_set_tcb_field *)skb->head;
1354         INIT_TP_WR(req, csk->tid);
1355         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1356         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1357         req->word_cookie = htons(0);
1358         req->mask = cpu_to_be64(0x3 << 8);
1359         req->val = cpu_to_be64(pg_idx << 8);
1360         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1361
1362         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1363                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1364
1365         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1366         return 0;
1367 }
1368
1369 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1370                                  int hcrc, int dcrc, int reply)
1371 {
1372         struct sk_buff *skb;
1373         struct cpl_set_tcb_field *req;
1374
1375         if (!hcrc && !dcrc)
1376                 return 0;
1377
1378         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1379         if (!skb)
1380                 return -ENOMEM;
1381
1382         csk->hcrc_len = (hcrc ? 4 : 0);
1383         csk->dcrc_len = (dcrc ? 4 : 0);
1384         /*  set up ulp submode */
1385         req = (struct cpl_set_tcb_field *)skb->head;
1386         INIT_TP_WR(req, tid);
1387         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1388         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1389         req->word_cookie = htons(0);
1390         req->mask = cpu_to_be64(0x3 << 4);
1391         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1392                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1393         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1394
1395         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1396                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1397
1398         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1399         return 0;
1400 }
1401
1402 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1403 {
1404         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1405         struct cxgbi_ddp_info *ddp = cdev->ddp;
1406         unsigned int tagmask, pgsz_factor[4];
1407         int err;
1408
1409         if (ddp) {
1410                 kref_get(&ddp->refcnt);
1411                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1412                         cdev, cdev->ddp);
1413                 return -EALREADY;
1414         }
1415
1416         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1417                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1418                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1419         if (err < 0)
1420                 return err;
1421
1422         ddp = cdev->ddp;
1423
1424         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1425         cxgbi_ddp_page_size_factor(pgsz_factor);
1426         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1427
1428         cdev->csk_ddp_free_gl_skb = NULL;
1429         cdev->csk_ddp_alloc_gl_skb = NULL;
1430         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1431         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1432         cdev->csk_ddp_set = ddp_set_map;
1433         cdev->csk_ddp_clear = ddp_clear_map;
1434
1435         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1436                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1437                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1438         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1439                 " %u/%u.\n",
1440                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1441                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1442                 ddp->max_rxsz, lldi->iscsi_iolen);
1443         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1444                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1445                 ddp->max_rxsz);
1446         return 0;
1447 }
1448
1449 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1450 {
1451         struct cxgbi_device *cdev;
1452         struct port_info *pi;
1453         int i, rc;
1454
1455         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1456         if (!cdev) {
1457                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1458                 return NULL;
1459         }
1460         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1461                 cdev, lldi->adapter_type, lldi->nports,
1462                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1463                 lldi->nrxq, lldi->wr_cred);
1464         for (i = 0; i < lldi->nrxq; i++)
1465                 log_debug(1 << CXGBI_DBG_DEV,
1466                         "t4 0x%p, rxq id #%d: %u.\n",
1467                         cdev, i, lldi->rxq_ids[i]);
1468
1469         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1470         cdev->flags = CXGBI_FLAG_DEV_T4;
1471         cdev->pdev = lldi->pdev;
1472         cdev->ports = lldi->ports;
1473         cdev->nports = lldi->nports;
1474         cdev->mtus = lldi->mtus;
1475         cdev->nmtus = NMTUS;
1476         cdev->snd_win = cxgb4i_snd_win;
1477         cdev->rcv_win = cxgb4i_rcv_win;
1478         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1479         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1480         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1481         cdev->itp = &cxgb4i_iscsi_transport;
1482
1483         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1484         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1485                 cdev, lldi->ports[0]->name, cdev->pfvf);
1486
1487         rc = cxgb4i_ddp_init(cdev);
1488         if (rc) {
1489                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1490                 goto err_out;
1491         }
1492         rc = cxgb4i_ofld_init(cdev);
1493         if (rc) {
1494                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1495                 goto err_out;
1496         }
1497
1498         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1499                                 &cxgb4i_host_template, cxgb4i_stt);
1500         if (rc)
1501                 goto err_out;
1502
1503         for (i = 0; i < cdev->nports; i++) {
1504                 pi = netdev_priv(lldi->ports[i]);
1505                 cdev->hbas[i]->port_id = pi->port_id;
1506         }
1507         return cdev;
1508
1509 err_out:
1510         cxgbi_device_unregister(cdev);
1511         return ERR_PTR(-ENOMEM);
1512 }
1513
1514 #define RX_PULL_LEN     128
1515 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1516                                 const struct pkt_gl *pgl)
1517 {
1518         const struct cpl_act_establish *rpl;
1519         struct sk_buff *skb;
1520         unsigned int opc;
1521         struct cxgbi_device *cdev = handle;
1522
1523         if (pgl == NULL) {
1524                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1525
1526                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1527                 if (!skb)
1528                         goto nomem;
1529                 skb_copy_to_linear_data(skb, &rsp[1], len);
1530         } else {
1531                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1532                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1533                                 pgl->va, be64_to_cpu(*rsp),
1534                                 be64_to_cpu(*(u64 *)pgl->va),
1535                                 pgl->tot_len);
1536                         return 0;
1537                 }
1538                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1539                 if (unlikely(!skb))
1540                         goto nomem;
1541         }
1542
1543         rpl = (struct cpl_act_establish *)skb->data;
1544         opc = rpl->ot.opcode;
1545         log_debug(1 << CXGBI_DBG_TOE,
1546                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1547                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1548         if (cxgb4i_cplhandlers[opc])
1549                 cxgb4i_cplhandlers[opc](cdev, skb);
1550         else {
1551                 pr_err("No handler for opcode 0x%x.\n", opc);
1552                 __kfree_skb(skb);
1553         }
1554         return 0;
1555 nomem:
1556         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1557         return 1;
1558 }
1559
1560 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1561 {
1562         struct cxgbi_device *cdev = handle;
1563
1564         switch (state) {
1565         case CXGB4_STATE_UP:
1566                 pr_info("cdev 0x%p, UP.\n", cdev);
1567                 /* re-initialize */
1568                 break;
1569         case CXGB4_STATE_START_RECOVERY:
1570                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1571                 /* close all connections */
1572                 break;
1573         case CXGB4_STATE_DOWN:
1574                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1575                 break;
1576         case CXGB4_STATE_DETACH:
1577                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1578                 break;
1579         default:
1580                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1581                 break;
1582         }
1583         return 0;
1584 }
1585
1586 static int __init cxgb4i_init_module(void)
1587 {
1588         int rc;
1589
1590         printk(KERN_INFO "%s", version);
1591
1592         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1593         if (rc < 0)
1594                 return rc;
1595         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1596         return 0;
1597 }
1598
1599 static void __exit cxgb4i_exit_module(void)
1600 {
1601         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1602         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1603         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1604 }
1605
1606 module_init(cxgb4i_init_module);
1607 module_exit(cxgb4i_exit_module);