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/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <scsi/scsi_host.h>
  19 #include <net/tcp.h>
  20 #include <net/dst.h>
  21 #include <linux/netdevice.h>
  22
  23 #include "t4_regs.h"
  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/T5 iSCSI Driver"
  37 #define DRV_MODULE_VERSION      "0.9.4"
  38
  39 static char version[] =
  40         DRV_MODULE_DESC " " DRV_MODULE_NAME
  41         " v" DRV_MODULE_VERSION "\n";
  42
  43 MODULE_AUTHOR("Chelsio Communications, Inc.");
  44 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  45 MODULE_VERSION(DRV_MODULE_VERSION);
  46 MODULE_LICENSE("GPL");
  47
  48 module_param(dbg_level, uint, 0644);
  49 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
  50
  51 static int cxgb4i_rcv_win = 256 * 1024;
  52 module_param(cxgb4i_rcv_win, int, 0644);
  53 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
  54
  55 static int cxgb4i_snd_win = 128 * 1024;
  56 module_param(cxgb4i_snd_win, int, 0644);
  57 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
  58
  59 static int cxgb4i_rx_credit_thres = 10 * 1024;
  60 module_param(cxgb4i_rx_credit_thres, int, 0644);
  61 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
  62                 "RX credits return threshold in bytes (default=10KB)");
  63
  64 static unsigned int cxgb4i_max_connect = (8 * 1024);
  65 module_param(cxgb4i_max_connect, uint, 0644);
  66 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
  67
  68 static unsigned short cxgb4i_sport_base = 20000;
  69 module_param(cxgb4i_sport_base, ushort, 0644);
  70 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
  71
  72 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
  73
  74 static void *t4_uld_add(const struct cxgb4_lld_info *);
  75 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
  76 static int t4_uld_state_change(void *, enum cxgb4_state state);
  77
  78 static const struct cxgb4_uld_info cxgb4i_uld_info = {
  79         .name = DRV_MODULE_NAME,
  80         .add = t4_uld_add,
  81         .rx_handler = t4_uld_rx_handler,
  82         .state_change = t4_uld_state_change,
  83 };
  84
  85 static struct scsi_host_template cxgb4i_host_template = {
  86         .module         = THIS_MODULE,
  87         .name           = DRV_MODULE_NAME,
  88         .proc_name      = DRV_MODULE_NAME,
  89         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
  90         .queuecommand   = iscsi_queuecommand,
  91         .change_queue_depth = iscsi_change_queue_depth,
  92         .sg_tablesize   = SG_ALL,
  93         .max_sectors    = 0xFFFF,
  94         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  95         .eh_abort_handler = iscsi_eh_abort,
  96         .eh_device_reset_handler = iscsi_eh_device_reset,
  97         .eh_target_reset_handler = iscsi_eh_recover_target,
  98         .target_alloc   = iscsi_target_alloc,
  99         .use_clustering = DISABLE_CLUSTERING,
 100         .this_id        = -1,
 101 };
 102
 103 static struct iscsi_transport cxgb4i_iscsi_transport = {
 104         .owner          = THIS_MODULE,
 105         .name           = DRV_MODULE_NAME,
 106         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 107                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 108                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 109         .attr_is_visible        = cxgbi_attr_is_visible,
 110         .get_host_param = cxgbi_get_host_param,
 111         .set_host_param = cxgbi_set_host_param,
 112         /* session management */
 113         .create_session = cxgbi_create_session,
 114         .destroy_session        = cxgbi_destroy_session,
 115         .get_session_param = iscsi_session_get_param,
 116         /* connection management */
 117         .create_conn    = cxgbi_create_conn,
 118         .bind_conn              = cxgbi_bind_conn,
 119         .destroy_conn   = iscsi_tcp_conn_teardown,
 120         .start_conn             = iscsi_conn_start,
 121         .stop_conn              = iscsi_conn_stop,
 122         .get_conn_param = iscsi_conn_get_param,
 123         .set_param      = cxgbi_set_conn_param,
 124         .get_stats      = cxgbi_get_conn_stats,
 125         /* pdu xmit req from user space */
 126         .send_pdu       = iscsi_conn_send_pdu,
 127         /* task */
 128         .init_task      = iscsi_tcp_task_init,
 129         .xmit_task      = iscsi_tcp_task_xmit,
 130         .cleanup_task   = cxgbi_cleanup_task,
 131         /* pdu */
 132         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 133         .init_pdu       = cxgbi_conn_init_pdu,
 134         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 135         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 136         /* TCP connect/disconnect */
 137         .get_ep_param   = cxgbi_get_ep_param,
 138         .ep_connect     = cxgbi_ep_connect,
 139         .ep_poll        = cxgbi_ep_poll,
 140         .ep_disconnect  = cxgbi_ep_disconnect,
 141         /* Error recovery timeout call */
 142         .session_recovery_timedout = iscsi_session_recovery_timedout,
 143 };
 144
 145 static struct scsi_transport_template *cxgb4i_stt;
 146
 147 /*
 148  * CPL (Chelsio Protocol Language) defines a message passing interface between
 149  * the host driver and Chelsio asic.
 150  * The section below implments CPLs that related to iscsi tcp connection
 151  * open/close/abort and data send/receive.
 152  */
 153 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
 154 #define RCV_BUFSIZ_MASK         0x3FFU
 155 #define MAX_IMM_TX_PKT_LEN      128
 156
 157 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
 158                                 const struct cxgbi_sock *csk)
 159 {
 160         skb->queue_mapping = queue;
 161 }
 162
 163 static int push_tx_frames(struct cxgbi_sock *, int);
 164
 165 /*
 166  * is_ofld_imm - check whether a packet can be sent as immediate data
 167  * @skb: the packet
 168  *
 169  * Returns true if a packet can be sent as an offload WR with immediate
 170  * data.  We currently use the same limit as for Ethernet packets.
 171  */
 172 static inline int is_ofld_imm(const struct sk_buff *skb)
 173 {
 174         return skb->len <= (MAX_IMM_TX_PKT_LEN -
 175                         sizeof(struct fw_ofld_tx_data_wr));
 176 }
 177
 178
 179 #define VLAN_NONE 0xfff
 180 #define FILTER_SEL_VLAN_NONE 0xffff
 181 #define FILTER_SEL_WIDTH_P_FC (3+1) /* port uses 3 bits, FCoE one bit */
 182 #define FILTER_SEL_WIDTH_VIN_P_FC \
 183         (6 + 7 + FILTER_SEL_WIDTH_P_FC) /* 6 bits are unused, VF uses 7 bits*/
 184 #define FILTER_SEL_WIDTH_TAG_P_FC \
 185         (3 + FILTER_SEL_WIDTH_VIN_P_FC) /* PF uses 3 bits */
 186 #define FILTER_SEL_WIDTH_VLD_TAG_P_FC (1 + FILTER_SEL_WIDTH_TAG_P_FC)
 187
 188 static unsigned int select_ntuple(struct cxgbi_device *cdev,
 189                                 struct l2t_entry *l2t)
 190 {
 191         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 192         unsigned int ntuple = 0;
 193         u32 viid;
 194
 195         switch (lldi->filt_mode) {
 196
 197         /* default filter mode */
 198         case HW_TPL_FR_MT_PR_IV_P_FC:
 199                 if (l2t->vlan == VLAN_NONE)
 200                         ntuple |= FILTER_SEL_VLAN_NONE << FILTER_SEL_WIDTH_P_FC;
 201                 else {
 202                         ntuple |= l2t->vlan << FILTER_SEL_WIDTH_P_FC;
 203                         ntuple |= 1 << FILTER_SEL_WIDTH_VLD_TAG_P_FC;
 204                 }
 205                 ntuple |= l2t->lport << S_PORT | IPPROTO_TCP <<
 206                           FILTER_SEL_WIDTH_VLD_TAG_P_FC;
 207                 break;
 208         case HW_TPL_FR_MT_PR_OV_P_FC: {
 209                 viid = cxgb4_port_viid(l2t->neigh->dev);
 210
 211                 ntuple |= FW_VIID_VIN_GET(viid) << FILTER_SEL_WIDTH_P_FC;
 212                 ntuple |= FW_VIID_PFN_GET(viid) << FILTER_SEL_WIDTH_VIN_P_FC;
 213                 ntuple |= FW_VIID_VIVLD_GET(viid) << FILTER_SEL_WIDTH_TAG_P_FC;
 214                 ntuple |= l2t->lport << S_PORT | IPPROTO_TCP <<
 215                           FILTER_SEL_WIDTH_VLD_TAG_P_FC;
 216                 break;
 217         }
 218         default:
 219                 break;
 220         }
 221         return ntuple;
 222 }
 223
 224 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 225                                 struct l2t_entry *e)
 226 {
 227         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 228         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 229         unsigned long long opt0;
 230         unsigned int opt2;
 231         unsigned int qid_atid = ((unsigned int)csk->atid) |
 232                                  (((unsigned int)csk->rss_qid) << 14);
 233
 234         opt0 = KEEP_ALIVE(1) |
 235                 WND_SCALE(wscale) |
 236                 MSS_IDX(csk->mss_idx) |
 237                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 238                 TX_CHAN(csk->tx_chan) |
 239                 SMAC_SEL(csk->smac_idx) |
 240                 ULP_MODE(ULP_MODE_ISCSI) |
 241                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 242         opt2 = RX_CHANNEL(0) |
 243                 RSS_QUEUE_VALID |
 244                 (1 << 20) |
 245                 RSS_QUEUE(csk->rss_qid);
 246
 247         if (is_t4(lldi->adapter_type)) {
 248                 struct cpl_act_open_req *req =
 249                                 (struct cpl_act_open_req *)skb->head;
 250
 251                 req = (struct cpl_act_open_req *)skb->head;
 252
 253                 INIT_TP_WR(req, 0);
 254                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 255                                         qid_atid));
 256                 req->local_port = csk->saddr.sin_port;
 257                 req->peer_port = csk->daddr.sin_port;
 258                 req->local_ip = csk->saddr.sin_addr.s_addr;
 259                 req->peer_ip = csk->daddr.sin_addr.s_addr;
 260                 req->opt0 = cpu_to_be64(opt0);
 261                 req->params = cpu_to_be32(select_ntuple(csk->cdev, csk->l2t));
 262                 opt2 |= 1 << 22;
 263                 req->opt2 = cpu_to_be32(opt2);
 264
 265                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 266                         "csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 267                         csk, &req->local_ip, ntohs(req->local_port),
 268                         &req->peer_ip, ntohs(req->peer_port),
 269                         csk->atid, csk->rss_qid);
 270         } else {
 271                 struct cpl_t5_act_open_req *req =
 272                                 (struct cpl_t5_act_open_req *)skb->head;
 273
 274                 req = (struct cpl_t5_act_open_req *)skb->head;
 275
 276                 INIT_TP_WR(req, 0);
 277                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 278                                         qid_atid));
 279                 req->local_port = csk->saddr.sin_port;
 280                 req->peer_port = csk->daddr.sin_port;
 281                 req->local_ip = csk->saddr.sin_addr.s_addr;
 282                 req->peer_ip = csk->daddr.sin_addr.s_addr;
 283                 req->opt0 = cpu_to_be64(opt0);
 284                 req->params = cpu_to_be32(select_ntuple(csk->cdev, csk->l2t));
 285                 opt2 |= 1 << 31;
 286                 req->opt2 = cpu_to_be32(opt2);
 287
 288                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 289                         "csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 290                         csk, &req->local_ip, ntohs(req->local_port),
 291                         &req->peer_ip, ntohs(req->peer_port),
 292                         csk->atid, csk->rss_qid);
 293         }
 294
 295         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 296         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 297 }
 298
 299 static void send_close_req(struct cxgbi_sock *csk)
 300 {
 301         struct sk_buff *skb = csk->cpl_close;
 302         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 303         unsigned int tid = csk->tid;
 304
 305         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 306                 "csk 0x%p,%u,0x%lx, tid %u.\n",
 307                 csk, csk->state, csk->flags, csk->tid);
 308         csk->cpl_close = NULL;
 309         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 310         INIT_TP_WR(req, tid);
 311         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 312         req->rsvd = 0;
 313
 314         cxgbi_sock_skb_entail(csk, skb);
 315         if (csk->state >= CTP_ESTABLISHED)
 316                 push_tx_frames(csk, 1);
 317 }
 318
 319 static void abort_arp_failure(void *handle, struct sk_buff *skb)
 320 {
 321         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
 322         struct cpl_abort_req *req;
 323
 324         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 325                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
 326                 csk, csk->state, csk->flags, csk->tid);
 327         req = (struct cpl_abort_req *)skb->data;
 328         req->cmd = CPL_ABORT_NO_RST;
 329         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 330 }
 331
 332 static void send_abort_req(struct cxgbi_sock *csk)
 333 {
 334         struct cpl_abort_req *req;
 335         struct sk_buff *skb = csk->cpl_abort_req;
 336
 337         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
 338                 return;
 339         cxgbi_sock_set_state(csk, CTP_ABORTING);
 340         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 341         cxgbi_sock_purge_write_queue(csk);
 342
 343         csk->cpl_abort_req = NULL;
 344         req = (struct cpl_abort_req *)skb->head;
 345         set_queue(skb, CPL_PRIORITY_DATA, csk);
 346         req->cmd = CPL_ABORT_SEND_RST;
 347         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 348         INIT_TP_WR(req, csk->tid);
 349         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 350         req->rsvd0 = htonl(csk->snd_nxt);
 351         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 352
 353         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 354                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 355                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 356                 req->rsvd1);
 357
 358         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 359 }
 360
 361 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 362 {
 363         struct sk_buff *skb = csk->cpl_abort_rpl;
 364         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 365
 366         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 367                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 368                 csk, csk->state, csk->flags, csk->tid, rst_status);
 369
 370         csk->cpl_abort_rpl = NULL;
 371         set_queue(skb, CPL_PRIORITY_DATA, csk);
 372         INIT_TP_WR(rpl, csk->tid);
 373         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 374         rpl->cmd = rst_status;
 375         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 376 }
 377
 378 /*
 379  * CPL connection rx data ack: host ->
 380  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 381  * credits sent.
 382  */
 383 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 384 {
 385         struct sk_buff *skb;
 386         struct cpl_rx_data_ack *req;
 387
 388         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 389                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 390                 csk, csk->state, csk->flags, csk->tid, credits);
 391
 392         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 393         if (!skb) {
 394                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 395                 return 0;
 396         }
 397         req = (struct cpl_rx_data_ack *)skb->head;
 398
 399         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 400         INIT_TP_WR(req, csk->tid);
 401         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 402                                       csk->tid));
 403         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
 404         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 405         return credits;
 406 }
 407
 408 /*
 409  * sgl_len - calculates the size of an SGL of the given capacity
 410  * @n: the number of SGL entries
 411  * Calculates the number of flits needed for a scatter/gather list that
 412  * can hold the given number of entries.
 413  */
 414 static inline unsigned int sgl_len(unsigned int n)
 415 {
 416         n--;
 417         return (3 * n) / 2 + (n & 1) + 2;
 418 }
 419
 420 /*
 421  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 422  * @skb: the packet
 423  *
 424  * Returns the number of flits needed for the given offload packet.
 425  * These packets are already fully constructed and no additional headers
 426  * will be added.
 427  */
 428 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 429 {
 430         unsigned int flits, cnt;
 431
 432         if (is_ofld_imm(skb))
 433                 return DIV_ROUND_UP(skb->len, 8);
 434         flits = skb_transport_offset(skb) / 8;
 435         cnt = skb_shinfo(skb)->nr_frags;
 436         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 437                 cnt++;
 438         return flits + sgl_len(cnt);
 439 }
 440
 441 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
 442 {
 443         struct sk_buff *skb;
 444         struct fw_flowc_wr *flowc;
 445         int flowclen, i;
 446
 447         flowclen = 80;
 448         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 449         flowc = (struct fw_flowc_wr *)skb->head;
 450         flowc->op_to_nparams =
 451                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
 452         flowc->flowid_len16 =
 453                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
 454                                 FW_WR_FLOWID(csk->tid));
 455         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 456         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 457         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 458         flowc->mnemval[1].val = htonl(csk->tx_chan);
 459         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 460         flowc->mnemval[2].val = htonl(csk->tx_chan);
 461         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 462         flowc->mnemval[3].val = htonl(csk->rss_qid);
 463         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 464         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 465         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 466         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 467         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 468         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 469         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 470         flowc->mnemval[7].val = htonl(csk->advmss);
 471         flowc->mnemval[8].mnemonic = 0;
 472         flowc->mnemval[8].val = 0;
 473         for (i = 0; i < 9; i++) {
 474                 flowc->mnemval[i].r4[0] = 0;
 475                 flowc->mnemval[i].r4[1] = 0;
 476                 flowc->mnemval[i].r4[2] = 0;
 477         }
 478         set_queue(skb, CPL_PRIORITY_DATA, csk);
 479
 480         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 481                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 482                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 483                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 484                 csk->advmss);
 485
 486         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 487 }
 488
 489 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 490                                    int dlen, int len, u32 credits, int compl)
 491 {
 492         struct fw_ofld_tx_data_wr *req;
 493         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 494         unsigned int wr_ulp_mode = 0;
 495
 496         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 497
 498         if (is_ofld_imm(skb)) {
 499                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 500                                         FW_WR_COMPL(1) |
 501                                         FW_WR_IMMDLEN(dlen));
 502                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
 503                                                 FW_WR_LEN16(credits));
 504         } else {
 505                 req->op_to_immdlen =
 506                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 507                                         FW_WR_COMPL(1) |
 508                                         FW_WR_IMMDLEN(0));
 509                 req->flowid_len16 =
 510                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
 511                                         FW_WR_LEN16(credits));
 512         }
 513         if (submode)
 514                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
 515                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
 516         req->tunnel_to_proxy = htonl(wr_ulp_mode |
 517                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1));
 518         req->plen = htonl(len);
 519         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 520                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 521 }
 522
 523 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 524 {
 525         kfree_skb(skb);
 526 }
 527
 528 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 529 {
 530         int total_size = 0;
 531         struct sk_buff *skb;
 532
 533         if (unlikely(csk->state < CTP_ESTABLISHED ||
 534                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 535                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 536                          1 << CXGBI_DBG_PDU_TX,
 537                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 538                         csk, csk->state, csk->flags, csk->tid);
 539                 return 0;
 540         }
 541
 542         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 543                 int dlen = skb->len;
 544                 int len = skb->len;
 545                 unsigned int credits_needed;
 546
 547                 skb_reset_transport_header(skb);
 548                 if (is_ofld_imm(skb))
 549                         credits_needed = DIV_ROUND_UP(dlen +
 550                                         sizeof(struct fw_ofld_tx_data_wr), 16);
 551                 else
 552                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
 553                                         + sizeof(struct fw_ofld_tx_data_wr),
 554                                         16);
 555
 556                 if (csk->wr_cred < credits_needed) {
 557                         log_debug(1 << CXGBI_DBG_PDU_TX,
 558                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 559                                 csk, skb->len, skb->data_len,
 560                                 credits_needed, csk->wr_cred);
 561                         break;
 562                 }
 563                 __skb_unlink(skb, &csk->write_queue);
 564                 set_queue(skb, CPL_PRIORITY_DATA, csk);
 565                 skb->csum = credits_needed;
 566                 csk->wr_cred -= credits_needed;
 567                 csk->wr_una_cred += credits_needed;
 568                 cxgbi_sock_enqueue_wr(csk, skb);
 569
 570                 log_debug(1 << CXGBI_DBG_PDU_TX,
 571                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 572                         csk, skb->len, skb->data_len, credits_needed,
 573                         csk->wr_cred, csk->wr_una_cred);
 574
 575                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 576                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 577                                 send_tx_flowc_wr(csk);
 578                                 skb->csum += 5;
 579                                 csk->wr_cred -= 5;
 580                                 csk->wr_una_cred += 5;
 581                         }
 582                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 583                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 584                                         req_completion);
 585                         csk->snd_nxt += len;
 586                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 587                 }
 588                 total_size += skb->truesize;
 589                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 590
 591                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 592                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 593                         csk, csk->state, csk->flags, csk->tid, skb, len);
 594
 595                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 596         }
 597         return total_size;
 598 }
 599
 600 static inline void free_atid(struct cxgbi_sock *csk)
 601 {
 602         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 603
 604         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 605                 cxgb4_free_atid(lldi->tids, csk->atid);
 606                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 607                 cxgbi_sock_put(csk);
 608         }
 609 }
 610
 611 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 612 {
 613         struct cxgbi_sock *csk;
 614         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 615         unsigned short tcp_opt = ntohs(req->tcp_opt);
 616         unsigned int tid = GET_TID(req);
 617         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 618         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 619         struct tid_info *t = lldi->tids;
 620         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 621
 622         csk = lookup_atid(t, atid);
 623         if (unlikely(!csk)) {
 624                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 625                 goto rel_skb;
 626         }
 627
 628         if (csk->atid != atid) {
 629                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 630                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 631                 goto rel_skb;
 632         }
 633
 634         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 635                 "csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
 636                 csk, csk->state, csk->flags, tid, atid, rcv_isn);
 637
 638         cxgbi_sock_get(csk);
 639         csk->tid = tid;
 640         cxgb4_insert_tid(lldi->tids, csk, tid);
 641         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 642
 643         free_atid(csk);
 644
 645         spin_lock_bh(&csk->lock);
 646         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 647                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 648                         csk, csk->state, csk->flags, csk->tid);
 649
 650         if (csk->retry_timer.function) {
 651                 del_timer(&csk->retry_timer);
 652                 csk->retry_timer.function = NULL;
 653         }
 654
 655         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 656         /*
 657          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 658          * pass through opt0.
 659          */
 660         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 661                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 662
 663         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 664         if (GET_TCPOPT_TSTAMP(tcp_opt))
 665                 csk->advmss -= 12;
 666         if (csk->advmss < 128)
 667                 csk->advmss = 128;
 668
 669         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 670                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 671                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 672
 673         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 674
 675         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 676                 send_abort_req(csk);
 677         else {
 678                 if (skb_queue_len(&csk->write_queue))
 679                         push_tx_frames(csk, 0);
 680                 cxgbi_conn_tx_open(csk);
 681         }
 682         spin_unlock_bh(&csk->lock);
 683
 684 rel_skb:
 685         __kfree_skb(skb);
 686 }
 687
 688 static int act_open_rpl_status_to_errno(int status)
 689 {
 690         switch (status) {
 691         case CPL_ERR_CONN_RESET:
 692                 return -ECONNREFUSED;
 693         case CPL_ERR_ARP_MISS:
 694                 return -EHOSTUNREACH;
 695         case CPL_ERR_CONN_TIMEDOUT:
 696                 return -ETIMEDOUT;
 697         case CPL_ERR_TCAM_FULL:
 698                 return -ENOMEM;
 699         case CPL_ERR_CONN_EXIST:
 700                 return -EADDRINUSE;
 701         default:
 702                 return -EIO;
 703         }
 704 }
 705
 706 static void csk_act_open_retry_timer(unsigned long data)
 707 {
 708         struct sk_buff *skb;
 709         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 710         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 711
 712         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 713                 "csk 0x%p,%u,0x%lx,%u.\n",
 714                 csk, csk->state, csk->flags, csk->tid);
 715
 716         cxgbi_sock_get(csk);
 717         spin_lock_bh(&csk->lock);
 718         skb = alloc_wr(is_t4(lldi->adapter_type) ?
 719                                 sizeof(struct cpl_act_open_req) :
 720                                 sizeof(struct cpl_t5_act_open_req),
 721                         0, GFP_ATOMIC);
 722         if (!skb)
 723                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 724         else {
 725                 skb->sk = (struct sock *)csk;
 726                 t4_set_arp_err_handler(skb, csk,
 727                                         cxgbi_sock_act_open_req_arp_failure);
 728                 send_act_open_req(csk, skb, csk->l2t);
 729         }
 730         spin_unlock_bh(&csk->lock);
 731         cxgbi_sock_put(csk);
 732 }
 733
 734 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 735 {
 736         struct cxgbi_sock *csk;
 737         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 738         unsigned int tid = GET_TID(rpl);
 739         unsigned int atid =
 740                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 741         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 742         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 743         struct tid_info *t = lldi->tids;
 744
 745         csk = lookup_atid(t, atid);
 746         if (unlikely(!csk)) {
 747                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 748                 goto rel_skb;
 749         }
 750
 751         pr_info("%pI4:%u-%pI4:%u, atid %u,%u, status %u, csk 0x%p,%u,0x%lx.\n",
 752                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 753                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port),
 754                 atid, tid, status, csk, csk->state, csk->flags);
 755
 756         if (status == CPL_ERR_RTX_NEG_ADVICE)
 757                 goto rel_skb;
 758
 759         if (status && status != CPL_ERR_TCAM_FULL &&
 760             status != CPL_ERR_CONN_EXIST &&
 761             status != CPL_ERR_ARP_MISS)
 762                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 763
 764         cxgbi_sock_get(csk);
 765         spin_lock_bh(&csk->lock);
 766
 767         if (status == CPL_ERR_CONN_EXIST &&
 768             csk->retry_timer.function != csk_act_open_retry_timer) {
 769                 csk->retry_timer.function = csk_act_open_retry_timer;
 770                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 771         } else
 772                 cxgbi_sock_fail_act_open(csk,
 773                                         act_open_rpl_status_to_errno(status));
 774
 775         spin_unlock_bh(&csk->lock);
 776         cxgbi_sock_put(csk);
 777 rel_skb:
 778         __kfree_skb(skb);
 779 }
 780
 781 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 782 {
 783         struct cxgbi_sock *csk;
 784         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 785         unsigned int tid = GET_TID(req);
 786         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 787         struct tid_info *t = lldi->tids;
 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         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 795                 "csk 0x%p,%u,0x%lx,%u.\n",
 796                 csk, csk->state, csk->flags, csk->tid);
 797         cxgbi_sock_rcv_peer_close(csk);
 798 rel_skb:
 799         __kfree_skb(skb);
 800 }
 801
 802 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 803 {
 804         struct cxgbi_sock *csk;
 805         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 806         unsigned int tid = GET_TID(rpl);
 807         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 808         struct tid_info *t = lldi->tids;
 809
 810         csk = lookup_tid(t, tid);
 811         if (unlikely(!csk)) {
 812                 pr_err("can't find connection for tid %u.\n", tid);
 813                 goto rel_skb;
 814         }
 815         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 816                 "csk 0x%p,%u,0x%lx,%u.\n",
 817                 csk, csk->state, csk->flags, csk->tid);
 818         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 819 rel_skb:
 820         __kfree_skb(skb);
 821 }
 822
 823 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 824                                                                 int *need_rst)
 825 {
 826         switch (abort_reason) {
 827         case CPL_ERR_BAD_SYN: /* fall through */
 828         case CPL_ERR_CONN_RESET:
 829                 return csk->state > CTP_ESTABLISHED ?
 830                         -EPIPE : -ECONNRESET;
 831         case CPL_ERR_XMIT_TIMEDOUT:
 832         case CPL_ERR_PERSIST_TIMEDOUT:
 833         case CPL_ERR_FINWAIT2_TIMEDOUT:
 834         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 835                 return -ETIMEDOUT;
 836         default:
 837                 return -EIO;
 838         }
 839 }
 840
 841 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 842 {
 843         struct cxgbi_sock *csk;
 844         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 845         unsigned int tid = GET_TID(req);
 846         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 847         struct tid_info *t = lldi->tids;
 848         int rst_status = CPL_ABORT_NO_RST;
 849
 850         csk = lookup_tid(t, tid);
 851         if (unlikely(!csk)) {
 852                 pr_err("can't find connection for tid %u.\n", tid);
 853                 goto rel_skb;
 854         }
 855
 856         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 857                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
 858                 csk, csk->state, csk->flags, csk->tid, req->status);
 859
 860         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 861             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 862                 goto rel_skb;
 863
 864         cxgbi_sock_get(csk);
 865         spin_lock_bh(&csk->lock);
 866
 867         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 868                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 869                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 870                 goto done;
 871         }
 872
 873         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 874         send_abort_rpl(csk, rst_status);
 875
 876         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 877                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 878                 cxgbi_sock_closed(csk);
 879         }
 880 done:
 881         spin_unlock_bh(&csk->lock);
 882         cxgbi_sock_put(csk);
 883 rel_skb:
 884         __kfree_skb(skb);
 885 }
 886
 887 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 888 {
 889         struct cxgbi_sock *csk;
 890         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 891         unsigned int tid = GET_TID(rpl);
 892         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 893         struct tid_info *t = lldi->tids;
 894
 895         csk = lookup_tid(t, tid);
 896         if (!csk)
 897                 goto rel_skb;
 898
 899         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 900                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 901                 rpl->status, csk, csk ? csk->state : 0,
 902                 csk ? csk->flags : 0UL);
 903
 904         if (rpl->status == CPL_ERR_ABORT_FAILED)
 905                 goto rel_skb;
 906
 907         cxgbi_sock_rcv_abort_rpl(csk);
 908 rel_skb:
 909         __kfree_skb(skb);
 910 }
 911
 912 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 913 {
 914         struct cxgbi_sock *csk;
 915         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 916         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 917         unsigned int tid = GET_TID(cpl);
 918         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 919         struct tid_info *t = lldi->tids;
 920
 921         csk = lookup_tid(t, tid);
 922         if (unlikely(!csk)) {
 923                 pr_err("can't find conn. for tid %u.\n", tid);
 924                 goto rel_skb;
 925         }
 926
 927         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 928                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
 929                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
 930                 pdu_len_ddp);
 931
 932         spin_lock_bh(&csk->lock);
 933
 934         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 935                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 936                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 937                         csk, csk->state, csk->flags, csk->tid);
 938                 if (csk->state != CTP_ABORTING)
 939                         goto abort_conn;
 940                 else
 941                         goto discard;
 942         }
 943
 944         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
 945         cxgbi_skcb_flags(skb) = 0;
 946
 947         skb_reset_transport_header(skb);
 948         __skb_pull(skb, sizeof(*cpl));
 949         __pskb_trim(skb, ntohs(cpl->len));
 950
 951         if (!csk->skb_ulp_lhdr) {
 952                 unsigned char *bhs;
 953                 unsigned int hlen, dlen, plen;
 954
 955                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 956                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
 957                         csk, csk->state, csk->flags, csk->tid, skb);
 958                 csk->skb_ulp_lhdr = skb;
 959                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
 960
 961                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
 962                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
 963                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
 964                                 csk->rcv_nxt);
 965                         goto abort_conn;
 966                 }
 967
 968                 bhs = skb->data;
 969                 hlen = ntohs(cpl->len);
 970                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
 971
 972                 plen = ISCSI_PDU_LEN(pdu_len_ddp);
 973                 if (is_t4(lldi->adapter_type))
 974                         plen -= 40;
 975
 976                 if ((hlen + dlen) != plen) {
 977                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
 978                                 "mismatch %u != %u + %u, seq 0x%x.\n",
 979                                 csk->tid, plen, hlen, dlen,
 980                                 cxgbi_skcb_tcp_seq(skb));
 981                         goto abort_conn;
 982                 }
 983
 984                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
 985                 if (dlen)
 986                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
 987                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
 988
 989                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 990                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
 991                         csk, skb, *bhs, hlen, dlen,
 992                         ntohl(*((unsigned int *)(bhs + 16))),
 993                         ntohl(*((unsigned int *)(bhs + 24))));
 994
 995         } else {
 996                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
 997
 998                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
 999                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1000                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1001                         csk, csk->state, csk->flags, skb, lskb);
1002         }
1003
1004         __skb_queue_tail(&csk->receive_queue, skb);
1005         spin_unlock_bh(&csk->lock);
1006         return;
1007
1008 abort_conn:
1009         send_abort_req(csk);
1010 discard:
1011         spin_unlock_bh(&csk->lock);
1012 rel_skb:
1013         __kfree_skb(skb);
1014 }
1015
1016 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1017                                   struct sk_buff *skb)
1018 {
1019         struct cxgbi_sock *csk;
1020         struct sk_buff *lskb;
1021         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1022         unsigned int tid = GET_TID(rpl);
1023         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1024         struct tid_info *t = lldi->tids;
1025         unsigned int status = ntohl(rpl->ddpvld);
1026
1027         csk = lookup_tid(t, tid);
1028         if (unlikely(!csk)) {
1029                 pr_err("can't find connection for tid %u.\n", tid);
1030                 goto rel_skb;
1031         }
1032
1033         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1034                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1035                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
1036
1037         spin_lock_bh(&csk->lock);
1038
1039         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1040                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1041                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1042                         csk, csk->state, csk->flags, csk->tid);
1043                 if (csk->state != CTP_ABORTING)
1044                         goto abort_conn;
1045                 else
1046                         goto discard;
1047         }
1048
1049         if (!csk->skb_ulp_lhdr) {
1050                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1051                 goto abort_conn;
1052         }
1053
1054         lskb = csk->skb_ulp_lhdr;
1055         csk->skb_ulp_lhdr = NULL;
1056
1057         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1058
1059         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1060                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1061                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1062
1063         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1064                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1065                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1066                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1067         }
1068         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1069                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1070                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1071                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1072         }
1073         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1074                 log_debug(1 << CXGBI_DBG_PDU_RX,
1075                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1076                         csk, lskb, status);
1077                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1078         }
1079         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1080                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1081                 log_debug(1 << CXGBI_DBG_PDU_RX,
1082                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1083                         csk, lskb, status);
1084                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1085         }
1086         log_debug(1 << CXGBI_DBG_PDU_RX,
1087                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1088                 csk, lskb, cxgbi_skcb_flags(lskb));
1089
1090         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1091         cxgbi_conn_pdu_ready(csk);
1092         spin_unlock_bh(&csk->lock);
1093         goto rel_skb;
1094
1095 abort_conn:
1096         send_abort_req(csk);
1097 discard:
1098         spin_unlock_bh(&csk->lock);
1099 rel_skb:
1100         __kfree_skb(skb);
1101 }
1102
1103 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1104 {
1105         struct cxgbi_sock *csk;
1106         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1107         unsigned int tid = GET_TID(rpl);
1108         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1109         struct tid_info *t = lldi->tids;
1110
1111         csk = lookup_tid(t, tid);
1112         if (unlikely(!csk))
1113                 pr_err("can't find connection for tid %u.\n", tid);
1114         else {
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                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1119                                         rpl->seq_vld);
1120         }
1121         __kfree_skb(skb);
1122 }
1123
1124 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1125 {
1126         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1127         unsigned int tid = GET_TID(rpl);
1128         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1129         struct tid_info *t = lldi->tids;
1130         struct cxgbi_sock *csk;
1131
1132         csk = lookup_tid(t, tid);
1133         if (!csk)
1134                 pr_err("can't find conn. for tid %u.\n", tid);
1135
1136         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1137                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1138                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1139
1140         if (rpl->status != CPL_ERR_NONE)
1141                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1142                         csk, tid, rpl->status);
1143
1144         __kfree_skb(skb);
1145 }
1146
1147 static int alloc_cpls(struct cxgbi_sock *csk)
1148 {
1149         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1150                                         0, GFP_KERNEL);
1151         if (!csk->cpl_close)
1152                 return -ENOMEM;
1153
1154         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1155                                         0, GFP_KERNEL);
1156         if (!csk->cpl_abort_req)
1157                 goto free_cpls;
1158
1159         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1160                                         0, GFP_KERNEL);
1161         if (!csk->cpl_abort_rpl)
1162                 goto free_cpls;
1163         return 0;
1164
1165 free_cpls:
1166         cxgbi_sock_free_cpl_skbs(csk);
1167         return -ENOMEM;
1168 }
1169
1170 static inline void l2t_put(struct cxgbi_sock *csk)
1171 {
1172         if (csk->l2t) {
1173                 cxgb4_l2t_release(csk->l2t);
1174                 csk->l2t = NULL;
1175                 cxgbi_sock_put(csk);
1176         }
1177 }
1178
1179 static void release_offload_resources(struct cxgbi_sock *csk)
1180 {
1181         struct cxgb4_lld_info *lldi;
1182
1183         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1184                 "csk 0x%p,%u,0x%lx,%u.\n",
1185                 csk, csk->state, csk->flags, csk->tid);
1186
1187         cxgbi_sock_free_cpl_skbs(csk);
1188         if (csk->wr_cred != csk->wr_max_cred) {
1189                 cxgbi_sock_purge_wr_queue(csk);
1190                 cxgbi_sock_reset_wr_list(csk);
1191         }
1192
1193         l2t_put(csk);
1194         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1195                 free_atid(csk);
1196         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1197                 lldi = cxgbi_cdev_priv(csk->cdev);
1198                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1199                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1200                 cxgbi_sock_put(csk);
1201         }
1202         csk->dst = NULL;
1203         csk->cdev = NULL;
1204 }
1205
1206 static int init_act_open(struct cxgbi_sock *csk)
1207 {
1208         struct cxgbi_device *cdev = csk->cdev;
1209         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1210         struct net_device *ndev = cdev->ports[csk->port_id];
1211         struct port_info *pi = netdev_priv(ndev);
1212         struct sk_buff *skb = NULL;
1213         struct neighbour *n;
1214         unsigned int step;
1215
1216         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1217                 "csk 0x%p,%u,0x%lx,%u.\n",
1218                 csk, csk->state, csk->flags, csk->tid);
1219
1220         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1221         if (csk->atid < 0) {
1222                 pr_err("%s, NO atid available.\n", ndev->name);
1223                 return -EINVAL;
1224         }
1225         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1226         cxgbi_sock_get(csk);
1227
1228         n = dst_neigh_lookup(csk->dst, &csk->daddr.sin_addr.s_addr);
1229         if (!n) {
1230                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1231                 goto rel_resource;
1232         }
1233         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1234         if (!csk->l2t) {
1235                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1236                 goto rel_resource;
1237         }
1238         cxgbi_sock_get(csk);
1239
1240         skb = alloc_wr(is_t4(lldi->adapter_type) ?
1241                                 sizeof(struct cpl_act_open_req) :
1242                                 sizeof(struct cpl_t5_act_open_req),
1243                         0, GFP_ATOMIC);
1244         if (!skb)
1245                 goto rel_resource;
1246         skb->sk = (struct sock *)csk;
1247         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1248
1249         if (!csk->mtu)
1250                 csk->mtu = dst_mtu(csk->dst);
1251         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1252         csk->tx_chan = cxgb4_port_chan(ndev);
1253         /* SMT two entries per row */
1254         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1255         step = lldi->ntxq / lldi->nchan;
1256         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1257         step = lldi->nrxq / lldi->nchan;
1258         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1259         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1260         csk->wr_una_cred = 0;
1261         cxgbi_sock_reset_wr_list(csk);
1262         csk->err = 0;
1263         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1264                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1265                 csk, pi->port_id, ndev->name, csk->tx_chan,
1266                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1267                 csk->smac_idx);
1268
1269         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1270         send_act_open_req(csk, skb, csk->l2t);
1271         neigh_release(n);
1272         return 0;
1273
1274 rel_resource:
1275         if (n)
1276                 neigh_release(n);
1277         if (skb)
1278                 __kfree_skb(skb);
1279         return -EINVAL;
1280 }
1281
1282 #define CPL_ISCSI_DATA          0xB2
1283 #define CPL_RX_ISCSI_DDP        0x49
1284 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1285         [CPL_ACT_ESTABLISH] = do_act_establish,
1286         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1287         [CPL_PEER_CLOSE] = do_peer_close,
1288         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1289         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1290         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1291         [CPL_FW4_ACK] = do_fw4_ack,
1292         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1293         [CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
1294         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1295         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1296         [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1297 };
1298
1299 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1300 {
1301         int rc;
1302
1303         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1304                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1305
1306         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1307                                         cxgb4i_max_connect);
1308         if (rc < 0)
1309                 return rc;
1310
1311         cdev->csk_release_offload_resources = release_offload_resources;
1312         cdev->csk_push_tx_frames = push_tx_frames;
1313         cdev->csk_send_abort_req = send_abort_req;
1314         cdev->csk_send_close_req = send_close_req;
1315         cdev->csk_send_rx_credits = send_rx_credits;
1316         cdev->csk_alloc_cpls = alloc_cpls;
1317         cdev->csk_init_act_open = init_act_open;
1318
1319         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1320         return 0;
1321 }
1322
1323 /*
1324  * functions to program the pagepod in h/w
1325  */
1326 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1327 static inline void ulp_mem_io_set_hdr(struct cxgb4_lld_info *lldi,
1328                                 struct ulp_mem_io *req,
1329                                 unsigned int wr_len, unsigned int dlen,
1330                                 unsigned int pm_addr)
1331 {
1332         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1333
1334         INIT_ULPTX_WR(req, wr_len, 0, 0);
1335         if (is_t4(lldi->adapter_type))
1336                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1337                                         (ULP_MEMIO_ORDER(1)));
1338         else
1339                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1340                                         (V_T5_ULP_MEMIO_IMM(1)));
1341         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1342         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1343         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1344
1345         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1346         idata->len = htonl(dlen);
1347 }
1348
1349 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1350                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1351                                 unsigned int npods,
1352                                 struct cxgbi_gather_list *gl,
1353                                 unsigned int gl_pidx)
1354 {
1355         struct cxgbi_ddp_info *ddp = cdev->ddp;
1356         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1357         struct sk_buff *skb;
1358         struct ulp_mem_io *req;
1359         struct ulptx_idata *idata;
1360         struct cxgbi_pagepod *ppod;
1361         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1362         unsigned int dlen = PPOD_SIZE * npods;
1363         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1364                                 sizeof(struct ulptx_idata) + dlen, 16);
1365         unsigned int i;
1366
1367         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1368         if (!skb) {
1369                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1370                         cdev, idx, npods);
1371                 return -ENOMEM;
1372         }
1373         req = (struct ulp_mem_io *)skb->head;
1374         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1375
1376         ulp_mem_io_set_hdr(lldi, req, wr_len, dlen, pm_addr);
1377         idata = (struct ulptx_idata *)(req + 1);
1378         ppod = (struct cxgbi_pagepod *)(idata + 1);
1379
1380         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1381                 if (!hdr && !gl)
1382                         cxgbi_ddp_ppod_clear(ppod);
1383                 else
1384                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1385         }
1386
1387         cxgb4_ofld_send(cdev->ports[port_id], skb);
1388         return 0;
1389 }
1390
1391 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1392                         unsigned int idx, unsigned int npods,
1393                         struct cxgbi_gather_list *gl)
1394 {
1395         unsigned int i, cnt;
1396         int err = 0;
1397
1398         for (i = 0; i < npods; i += cnt, idx += cnt) {
1399                 cnt = npods - i;
1400                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1401                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1402                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1403                                         idx, cnt, gl, 4 * i);
1404                 if (err < 0)
1405                         break;
1406         }
1407         return err;
1408 }
1409
1410 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1411                           unsigned int idx, unsigned int npods)
1412 {
1413         unsigned int i, cnt;
1414         int err;
1415
1416         for (i = 0; i < npods; i += cnt, idx += cnt) {
1417                 cnt = npods - i;
1418                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1419                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1420                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1421                                         idx, cnt, NULL, 0);
1422                 if (err < 0)
1423                         break;
1424         }
1425 }
1426
1427 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1428                                 int pg_idx, bool reply)
1429 {
1430         struct sk_buff *skb;
1431         struct cpl_set_tcb_field *req;
1432
1433         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1434                 return 0;
1435
1436         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1437         if (!skb)
1438                 return -ENOMEM;
1439
1440         /*  set up ulp page size */
1441         req = (struct cpl_set_tcb_field *)skb->head;
1442         INIT_TP_WR(req, csk->tid);
1443         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1444         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1445         req->word_cookie = htons(0);
1446         req->mask = cpu_to_be64(0x3 << 8);
1447         req->val = cpu_to_be64(pg_idx << 8);
1448         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1449
1450         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1451                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1452
1453         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1454         return 0;
1455 }
1456
1457 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1458                                  int hcrc, int dcrc, int reply)
1459 {
1460         struct sk_buff *skb;
1461         struct cpl_set_tcb_field *req;
1462
1463         if (!hcrc && !dcrc)
1464                 return 0;
1465
1466         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1467         if (!skb)
1468                 return -ENOMEM;
1469
1470         csk->hcrc_len = (hcrc ? 4 : 0);
1471         csk->dcrc_len = (dcrc ? 4 : 0);
1472         /*  set up ulp submode */
1473         req = (struct cpl_set_tcb_field *)skb->head;
1474         INIT_TP_WR(req, tid);
1475         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1476         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1477         req->word_cookie = htons(0);
1478         req->mask = cpu_to_be64(0x3 << 4);
1479         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1480                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1481         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1482
1483         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1484                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1485
1486         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1487         return 0;
1488 }
1489
1490 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1491 {
1492         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1493         struct cxgbi_ddp_info *ddp = cdev->ddp;
1494         unsigned int tagmask, pgsz_factor[4];
1495         int err;
1496
1497         if (ddp) {
1498                 kref_get(&ddp->refcnt);
1499                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1500                         cdev, cdev->ddp);
1501                 return -EALREADY;
1502         }
1503
1504         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1505                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1506                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1507         if (err < 0)
1508                 return err;
1509
1510         ddp = cdev->ddp;
1511
1512         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1513         cxgbi_ddp_page_size_factor(pgsz_factor);
1514         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1515
1516         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1517         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1518         cdev->csk_ddp_set = ddp_set_map;
1519         cdev->csk_ddp_clear = ddp_clear_map;
1520
1521         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1522                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1523                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1524         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1525                 " %u/%u.\n",
1526                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1527                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1528                 ddp->max_rxsz, lldi->iscsi_iolen);
1529         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1530                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1531                 ddp->max_rxsz);
1532         return 0;
1533 }
1534
1535 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1536 {
1537         struct cxgbi_device *cdev;
1538         struct port_info *pi;
1539         int i, rc;
1540
1541         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1542         if (!cdev) {
1543                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1544                 return NULL;
1545         }
1546         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1547                 cdev, lldi->adapter_type, lldi->nports,
1548                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1549                 lldi->nrxq, lldi->wr_cred);
1550         for (i = 0; i < lldi->nrxq; i++)
1551                 log_debug(1 << CXGBI_DBG_DEV,
1552                         "t4 0x%p, rxq id #%d: %u.\n",
1553                         cdev, i, lldi->rxq_ids[i]);
1554
1555         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1556         cdev->flags = CXGBI_FLAG_DEV_T4;
1557         cdev->pdev = lldi->pdev;
1558         cdev->ports = lldi->ports;
1559         cdev->nports = lldi->nports;
1560         cdev->mtus = lldi->mtus;
1561         cdev->nmtus = NMTUS;
1562         cdev->snd_win = cxgb4i_snd_win;
1563         cdev->rcv_win = cxgb4i_rcv_win;
1564         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1565         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1566         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1567         cdev->itp = &cxgb4i_iscsi_transport;
1568
1569         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1570         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1571                 cdev, lldi->ports[0]->name, cdev->pfvf);
1572
1573         rc = cxgb4i_ddp_init(cdev);
1574         if (rc) {
1575                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1576                 goto err_out;
1577         }
1578         rc = cxgb4i_ofld_init(cdev);
1579         if (rc) {
1580                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1581                 goto err_out;
1582         }
1583
1584         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1585                                 &cxgb4i_host_template, cxgb4i_stt);
1586         if (rc)
1587                 goto err_out;
1588
1589         for (i = 0; i < cdev->nports; i++) {
1590                 pi = netdev_priv(lldi->ports[i]);
1591                 cdev->hbas[i]->port_id = pi->port_id;
1592         }
1593         return cdev;
1594
1595 err_out:
1596         cxgbi_device_unregister(cdev);
1597         return ERR_PTR(-ENOMEM);
1598 }
1599
1600 #define RX_PULL_LEN     128
1601 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1602                                 const struct pkt_gl *pgl)
1603 {
1604         const struct cpl_act_establish *rpl;
1605         struct sk_buff *skb;
1606         unsigned int opc;
1607         struct cxgbi_device *cdev = handle;
1608
1609         if (pgl == NULL) {
1610                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1611
1612                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1613                 if (!skb)
1614                         goto nomem;
1615                 skb_copy_to_linear_data(skb, &rsp[1], len);
1616         } else {
1617                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1618                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1619                                 pgl->va, be64_to_cpu(*rsp),
1620                                 be64_to_cpu(*(u64 *)pgl->va),
1621                                 pgl->tot_len);
1622                         return 0;
1623                 }
1624                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1625                 if (unlikely(!skb))
1626                         goto nomem;
1627         }
1628
1629         rpl = (struct cpl_act_establish *)skb->data;
1630         opc = rpl->ot.opcode;
1631         log_debug(1 << CXGBI_DBG_TOE,
1632                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1633                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1634         if (cxgb4i_cplhandlers[opc])
1635                 cxgb4i_cplhandlers[opc](cdev, skb);
1636         else {
1637                 pr_err("No handler for opcode 0x%x.\n", opc);
1638                 __kfree_skb(skb);
1639         }
1640         return 0;
1641 nomem:
1642         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1643         return 1;
1644 }
1645
1646 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1647 {
1648         struct cxgbi_device *cdev = handle;
1649
1650         switch (state) {
1651         case CXGB4_STATE_UP:
1652                 pr_info("cdev 0x%p, UP.\n", cdev);
1653                 /* re-initialize */
1654                 break;
1655         case CXGB4_STATE_START_RECOVERY:
1656                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1657                 /* close all connections */
1658                 break;
1659         case CXGB4_STATE_DOWN:
1660                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1661                 break;
1662         case CXGB4_STATE_DETACH:
1663                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1664                 cxgbi_device_unregister(cdev);
1665                 break;
1666         default:
1667                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1668                 break;
1669         }
1670         return 0;
1671 }
1672
1673 static int __init cxgb4i_init_module(void)
1674 {
1675         int rc;
1676
1677         printk(KERN_INFO "%s", version);
1678
1679         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1680         if (rc < 0)
1681                 return rc;
1682         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1683         return 0;
1684 }
1685
1686 static void __exit cxgb4i_exit_module(void)
1687 {
1688         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1689         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1690         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1691 }
1692
1693 module_init(cxgb4i_init_module);
1694 module_exit(cxgb4i_exit_module);