kernel/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

   1 /*
   2  * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
   3  *
   4  * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
   5  *
   6  * This program is distributed in the hope that it will be useful, but WITHOUT
   7  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   8  * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
   9  * release for licensing terms and conditions.
  10  *
  11  * Written by:  Dimitris Michailidis (dm@chelsio.com)
  12  *              Karen Xie (kxie@chelsio.com)
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  16
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <scsi/scsi_host.h>
  20
  21 #include "common.h"
  22 #include "t3_cpl.h"
  23 #include "t3cdev.h"
  24 #include "cxgb3_defs.h"
  25 #include "cxgb3_ctl_defs.h"
  26 #include "cxgb3_offload.h"
  27 #include "firmware_exports.h"
  28 #include "cxgb3i.h"
  29
  30 static unsigned int dbg_level;
  31 #include "../libcxgbi.h"
  32
  33 #define DRV_MODULE_NAME         "cxgb3i"
  34 #define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
  35 #define DRV_MODULE_VERSION      "2.0.0"
  36 #define DRV_MODULE_RELDATE      "Jun. 2010"
  37
  38 static char version[] =
  39         DRV_MODULE_DESC " " DRV_MODULE_NAME
  40         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  41
  42 MODULE_AUTHOR("Chelsio Communications, Inc.");
  43 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  44 MODULE_VERSION(DRV_MODULE_VERSION);
  45 MODULE_LICENSE("GPL");
  46
  47 module_param(dbg_level, uint, 0644);
  48 MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
  49
  50 static int cxgb3i_rcv_win = 256 * 1024;
  51 module_param(cxgb3i_rcv_win, int, 0644);
  52 MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
  53
  54 static int cxgb3i_snd_win = 128 * 1024;
  55 module_param(cxgb3i_snd_win, int, 0644);
  56 MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
  57
  58 static int cxgb3i_rx_credit_thres = 10 * 1024;
  59 module_param(cxgb3i_rx_credit_thres, int, 0644);
  60 MODULE_PARM_DESC(rx_credit_thres,
  61                  "RX credits return threshold in bytes (default=10KB)");
  62
  63 static unsigned int cxgb3i_max_connect = 8 * 1024;
  64 module_param(cxgb3i_max_connect, uint, 0644);
  65 MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
  66
  67 static unsigned int cxgb3i_sport_base = 20000;
  68 module_param(cxgb3i_sport_base, uint, 0644);
  69 MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
  70
  71 static void cxgb3i_dev_open(struct t3cdev *);
  72 static void cxgb3i_dev_close(struct t3cdev *);
  73 static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
  74
  75 static struct cxgb3_client t3_client = {
  76         .name = DRV_MODULE_NAME,
  77         .handlers = cxgb3i_cpl_handlers,
  78         .add = cxgb3i_dev_open,
  79         .remove = cxgb3i_dev_close,
  80         .event_handler = cxgb3i_dev_event_handler,
  81 };
  82
  83 static struct scsi_host_template cxgb3i_host_template = {
  84         .module         = THIS_MODULE,
  85         .name           = DRV_MODULE_NAME,
  86         .proc_name      = DRV_MODULE_NAME,
  87         .can_queue      = CXGB3I_SCSI_HOST_QDEPTH,
  88         .queuecommand   = iscsi_queuecommand,
  89         .change_queue_depth = scsi_change_queue_depth,
  90         .sg_tablesize   = SG_ALL,
  91         .max_sectors    = 0xFFFF,
  92         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  93         .eh_abort_handler = iscsi_eh_abort,
  94         .eh_device_reset_handler = iscsi_eh_device_reset,
  95         .eh_target_reset_handler = iscsi_eh_recover_target,
  96         .target_alloc   = iscsi_target_alloc,
  97         .use_clustering = DISABLE_CLUSTERING,
  98         .this_id        = -1,
  99         .track_queue_depth = 1,
 100 };
 101
 102 static struct iscsi_transport cxgb3i_iscsi_transport = {
 103         .owner          = THIS_MODULE,
 104         .name           = DRV_MODULE_NAME,
 105         /* owner and name should be set already */
 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 *cxgb3i_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
 154 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
 155
 156 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 157                               const struct l2t_entry *e)
 158 {
 159         unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
 160         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
 161
 162         skb->priority = CPL_PRIORITY_SETUP;
 163
 164         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 165         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
 166         req->local_port = csk->saddr.sin_port;
 167         req->peer_port = csk->daddr.sin_port;
 168         req->local_ip = csk->saddr.sin_addr.s_addr;
 169         req->peer_ip = csk->daddr.sin_addr.s_addr;
 170
 171         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
 172                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
 173                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
 174         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
 175                         V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
 176
 177         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 178                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
 179                 csk, csk->state, csk->flags, csk->atid,
 180                 &req->local_ip, ntohs(req->local_port),
 181                 &req->peer_ip, ntohs(req->peer_port),
 182                 csk->mss_idx, e->idx, e->smt_idx);
 183
 184         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 185 }
 186
 187 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 188 {
 189         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
 190 }
 191
 192 /*
 193  * CPL connection close request: host ->
 194  *
 195  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 196  * the write queue (i.e., after any unsent txt data).
 197  */
 198 static void send_close_req(struct cxgbi_sock *csk)
 199 {
 200         struct sk_buff *skb = csk->cpl_close;
 201         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 202         unsigned int tid = csk->tid;
 203
 204         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 205                 "csk 0x%p,%u,0x%lx,%u.\n",
 206                 csk, csk->state, csk->flags, csk->tid);
 207
 208         csk->cpl_close = NULL;
 209         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
 210         req->wr.wr_lo = htonl(V_WR_TID(tid));
 211         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 212         req->rsvd = htonl(csk->write_seq);
 213
 214         cxgbi_sock_skb_entail(csk, skb);
 215         if (csk->state >= CTP_ESTABLISHED)
 216                 push_tx_frames(csk, 1);
 217 }
 218
 219 /*
 220  * CPL connection abort request: host ->
 221  *
 222  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 223  * for the same connection and also that we do not try to send a message
 224  * after the connection has closed.
 225  */
 226 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
 227 {
 228         struct cpl_abort_req *req = cplhdr(skb);
 229
 230         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 231                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
 232                 tdev, GET_TID(req), skb);
 233         req->cmd = CPL_ABORT_NO_RST;
 234         cxgb3_ofld_send(tdev, skb);
 235 }
 236
 237 static void send_abort_req(struct cxgbi_sock *csk)
 238 {
 239         struct sk_buff *skb = csk->cpl_abort_req;
 240         struct cpl_abort_req *req;
 241
 242         if (unlikely(csk->state == CTP_ABORTING || !skb))
 243                 return;
 244         cxgbi_sock_set_state(csk, CTP_ABORTING);
 245         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 246         /* Purge the send queue so we don't send anything after an abort. */
 247         cxgbi_sock_purge_write_queue(csk);
 248
 249         csk->cpl_abort_req = NULL;
 250         req = (struct cpl_abort_req *)skb->head;
 251         skb->priority = CPL_PRIORITY_DATA;
 252         set_arp_failure_handler(skb, abort_arp_failure);
 253         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
 254         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 255         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 256         req->rsvd0 = htonl(csk->snd_nxt);
 257         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 258         req->cmd = CPL_ABORT_SEND_RST;
 259
 260         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 261                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 262                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 263                 req->rsvd1);
 264
 265         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 266 }
 267
 268 /*
 269  * CPL connection abort reply: host ->
 270  *
 271  * Send an ABORT_RPL message in response of the ABORT_REQ received.
 272  */
 273 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 274 {
 275         struct sk_buff *skb = csk->cpl_abort_rpl;
 276         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 277
 278         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 279                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 280                 csk, csk->state, csk->flags, csk->tid, rst_status);
 281
 282         csk->cpl_abort_rpl = NULL;
 283         skb->priority = CPL_PRIORITY_DATA;
 284         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 285         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 286         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 287         rpl->cmd = rst_status;
 288         cxgb3_ofld_send(csk->cdev->lldev, skb);
 289 }
 290
 291 /*
 292  * CPL connection rx data ack: host ->
 293  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 294  * credits sent.
 295  */
 296 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 297 {
 298         struct sk_buff *skb;
 299         struct cpl_rx_data_ack *req;
 300         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
 301
 302         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 303                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
 304                 csk, csk->state, csk->flags, csk->tid, credits, dack);
 305
 306         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 307         if (!skb) {
 308                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 309                 return 0;
 310         }
 311         req = (struct cpl_rx_data_ack *)skb->head;
 312         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 313         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
 314         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
 315                                 V_RX_CREDITS(credits));
 316         skb->priority = CPL_PRIORITY_ACK;
 317         cxgb3_ofld_send(csk->cdev->lldev, skb);
 318         return credits;
 319 }
 320
 321 /*
 322  * CPL connection tx data: host ->
 323  *
 324  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 325  * credits sent.
 326  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 327  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 328  */
 329
 330 static unsigned int wrlen __read_mostly;
 331 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
 332
 333 static void init_wr_tab(unsigned int wr_len)
 334 {
 335         int i;
 336
 337         if (skb_wrs[1])         /* already initialized */
 338                 return;
 339         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
 340                 int sgl_len = (3 * i) / 2 + (i & 1);
 341
 342                 sgl_len += 3;
 343                 skb_wrs[i] = (sgl_len <= wr_len
 344                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
 345         }
 346         wrlen = wr_len * 8;
 347 }
 348
 349 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 350                                    int len, int req_completion)
 351 {
 352         struct tx_data_wr *req;
 353         struct l2t_entry *l2t = csk->l2t;
 354
 355         skb_reset_transport_header(skb);
 356         req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
 357         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
 358                         (req_completion ? F_WR_COMPL : 0));
 359         req->wr_lo = htonl(V_WR_TID(csk->tid));
 360         /* len includes the length of any HW ULP additions */
 361         req->len = htonl(len);
 362         /* V_TX_ULP_SUBMODE sets both the mode and submode */
 363         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
 364                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
 365         req->sndseq = htonl(csk->snd_nxt);
 366         req->param = htonl(V_TX_PORT(l2t->smt_idx));
 367
 368         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 369                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
 370                                     V_TX_CPU_IDX(csk->rss_qid));
 371                 /* sendbuffer is in units of 32KB. */
 372                 req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
 373                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 374         }
 375 }
 376
 377 /**
 378  * push_tx_frames -- start transmit
 379  * @c3cn: the offloaded connection
 380  * @req_completion: request wr_ack or not
 381  *
 382  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 383  * connection's send queue and sends them on to T3.  Must be called with the
 384  * connection's lock held.  Returns the amount of send buffer space that was
 385  * freed as a result of sending queued data to T3.
 386  */
 387
 388 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
 389 {
 390         kfree_skb(skb);
 391 }
 392
 393 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 394 {
 395         int total_size = 0;
 396         struct sk_buff *skb;
 397
 398         if (unlikely(csk->state < CTP_ESTABLISHED ||
 399                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 400                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 401                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 402                                 csk, csk->state, csk->flags, csk->tid);
 403                 return 0;
 404         }
 405
 406         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 407                 int len = skb->len;     /* length before skb_push */
 408                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
 409                 int wrs_needed = skb_wrs[frags];
 410
 411                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
 412                         wrs_needed = 1;
 413
 414                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
 415
 416                 if (csk->wr_cred < wrs_needed) {
 417                         log_debug(1 << CXGBI_DBG_PDU_TX,
 418                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
 419                                 csk, skb->len, skb->data_len, frags,
 420                                 wrs_needed, csk->wr_cred);
 421                         break;
 422                 }
 423
 424                 __skb_unlink(skb, &csk->write_queue);
 425                 skb->priority = CPL_PRIORITY_DATA;
 426                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
 427                 csk->wr_cred -= wrs_needed;
 428                 csk->wr_una_cred += wrs_needed;
 429                 cxgbi_sock_enqueue_wr(csk, skb);
 430
 431                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 432                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
 433                         "left %u, unack %u.\n",
 434                         csk, skb->len, skb->data_len, frags, skb->csum,
 435                         csk->wr_cred, csk->wr_una_cred);
 436
 437                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 438                         if ((req_completion &&
 439                                 csk->wr_una_cred == wrs_needed) ||
 440                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
 441                                 req_completion = 1;
 442                                 csk->wr_una_cred = 0;
 443                         }
 444                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 445                         make_tx_data_wr(csk, skb, len, req_completion);
 446                         csk->snd_nxt += len;
 447                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 448                 }
 449                 total_size += skb->truesize;
 450                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 451                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
 452                         csk, csk->tid, skb);
 453                 set_arp_failure_handler(skb, arp_failure_skb_discard);
 454                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
 455         }
 456         return total_size;
 457 }
 458
 459 /*
 460  * Process a CPL_ACT_ESTABLISH message: -> host
 461  * Updates connection state from an active establish CPL message.  Runs with
 462  * the connection lock held.
 463  */
 464
 465 static inline void free_atid(struct cxgbi_sock *csk)
 466 {
 467         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 468                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
 469                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 470                 cxgbi_sock_put(csk);
 471         }
 472 }
 473
 474 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 475 {
 476         struct cxgbi_sock *csk = ctx;
 477         struct cpl_act_establish *req = cplhdr(skb);
 478         unsigned int tid = GET_TID(req);
 479         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 480         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
 481
 482         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 483                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 484                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
 485
 486         cxgbi_sock_get(csk);
 487         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 488         csk->tid = tid;
 489         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
 490
 491         free_atid(csk);
 492
 493         csk->rss_qid = G_QNUM(ntohs(skb->csum));
 494
 495         spin_lock_bh(&csk->lock);
 496         if (csk->retry_timer.function) {
 497                 del_timer(&csk->retry_timer);
 498                 csk->retry_timer.function = NULL;
 499         }
 500
 501         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 502                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 503                         csk, csk->state, csk->flags, csk->tid);
 504
 505         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 506         if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
 507                 csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
 508
 509         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 510
 511         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 512                 /* upper layer has requested closing */
 513                 send_abort_req(csk);
 514         else {
 515                 if (skb_queue_len(&csk->write_queue))
 516                         push_tx_frames(csk, 1);
 517                 cxgbi_conn_tx_open(csk);
 518         }
 519
 520         spin_unlock_bh(&csk->lock);
 521         __kfree_skb(skb);
 522         return 0;
 523 }
 524
 525 /*
 526  * Process a CPL_ACT_OPEN_RPL message: -> host
 527  * Handle active open failures.
 528  */
 529 static int act_open_rpl_status_to_errno(int status)
 530 {
 531         switch (status) {
 532         case CPL_ERR_CONN_RESET:
 533                 return -ECONNREFUSED;
 534         case CPL_ERR_ARP_MISS:
 535                 return -EHOSTUNREACH;
 536         case CPL_ERR_CONN_TIMEDOUT:
 537                 return -ETIMEDOUT;
 538         case CPL_ERR_TCAM_FULL:
 539                 return -ENOMEM;
 540         case CPL_ERR_CONN_EXIST:
 541                 return -EADDRINUSE;
 542         default:
 543                 return -EIO;
 544         }
 545 }
 546
 547 static void act_open_retry_timer(unsigned long data)
 548 {
 549         struct sk_buff *skb;
 550         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 551
 552         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 553                 "csk 0x%p,%u,0x%lx,%u.\n",
 554                 csk, csk->state, csk->flags, csk->tid);
 555
 556         cxgbi_sock_get(csk);
 557         spin_lock_bh(&csk->lock);
 558         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 559         if (!skb)
 560                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 561         else {
 562                 skb->sk = (struct sock *)csk;
 563                 set_arp_failure_handler(skb, act_open_arp_failure);
 564                 send_act_open_req(csk, skb, csk->l2t);
 565         }
 566         spin_unlock_bh(&csk->lock);
 567         cxgbi_sock_put(csk);
 568 }
 569
 570 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 571 {
 572         struct cxgbi_sock *csk = ctx;
 573         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 574
 575         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
 576                 csk, csk->state, csk->flags, csk->atid, rpl->status,
 577                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 578                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
 579
 580         if (rpl->status != CPL_ERR_TCAM_FULL &&
 581             rpl->status != CPL_ERR_CONN_EXIST &&
 582             rpl->status != CPL_ERR_ARP_MISS)
 583                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
 584
 585         cxgbi_sock_get(csk);
 586         spin_lock_bh(&csk->lock);
 587         if (rpl->status == CPL_ERR_CONN_EXIST &&
 588             csk->retry_timer.function != act_open_retry_timer) {
 589                 csk->retry_timer.function = act_open_retry_timer;
 590                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 591         } else
 592                 cxgbi_sock_fail_act_open(csk,
 593                                 act_open_rpl_status_to_errno(rpl->status));
 594
 595         spin_unlock_bh(&csk->lock);
 596         cxgbi_sock_put(csk);
 597         __kfree_skb(skb);
 598         return 0;
 599 }
 600
 601 /*
 602  * Process PEER_CLOSE CPL messages: -> host
 603  * Handle peer FIN.
 604  */
 605 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 606 {
 607         struct cxgbi_sock *csk = ctx;
 608
 609         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 610                 "csk 0x%p,%u,0x%lx,%u.\n",
 611                 csk, csk->state, csk->flags, csk->tid);
 612
 613         cxgbi_sock_rcv_peer_close(csk);
 614         __kfree_skb(skb);
 615         return 0;
 616 }
 617
 618 /*
 619  * Process CLOSE_CONN_RPL CPL message: -> host
 620  * Process a peer ACK to our FIN.
 621  */
 622 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
 623                             void *ctx)
 624 {
 625         struct cxgbi_sock *csk = ctx;
 626         struct cpl_close_con_rpl *rpl = cplhdr(skb);
 627
 628         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 629                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
 630                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
 631
 632         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 633         __kfree_skb(skb);
 634         return 0;
 635 }
 636
 637 /*
 638  * Process ABORT_REQ_RSS CPL message: -> host
 639  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 640  * request except that we need to reply to it.
 641  */
 642
 643 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 644                                  int *need_rst)
 645 {
 646         switch (abort_reason) {
 647         case CPL_ERR_BAD_SYN: /* fall through */
 648         case CPL_ERR_CONN_RESET:
 649                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
 650         case CPL_ERR_XMIT_TIMEDOUT:
 651         case CPL_ERR_PERSIST_TIMEDOUT:
 652         case CPL_ERR_FINWAIT2_TIMEDOUT:
 653         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 654                 return -ETIMEDOUT;
 655         default:
 656                 return -EIO;
 657         }
 658 }
 659
 660 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 661 {
 662         const struct cpl_abort_req_rss *req = cplhdr(skb);
 663         struct cxgbi_sock *csk = ctx;
 664         int rst_status = CPL_ABORT_NO_RST;
 665
 666         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 667                 "csk 0x%p,%u,0x%lx,%u.\n",
 668                 csk, csk->state, csk->flags, csk->tid);
 669
 670         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 671             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
 672                 goto done;
 673         }
 674
 675         cxgbi_sock_get(csk);
 676         spin_lock_bh(&csk->lock);
 677
 678         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 679                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 680                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 681                 goto out;
 682         }
 683
 684         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 685         send_abort_rpl(csk, rst_status);
 686
 687         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 688                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 689                 cxgbi_sock_closed(csk);
 690         }
 691
 692 out:
 693         spin_unlock_bh(&csk->lock);
 694         cxgbi_sock_put(csk);
 695 done:
 696         __kfree_skb(skb);
 697         return 0;
 698 }
 699
 700 /*
 701  * Process ABORT_RPL_RSS CPL message: -> host
 702  * Process abort replies.  We only process these messages if we anticipate
 703  * them as the coordination between SW and HW in this area is somewhat lacking
 704  * and sometimes we get ABORT_RPLs after we are done with the connection that
 705  * originated the ABORT_REQ.
 706  */
 707 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 708 {
 709         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
 710         struct cxgbi_sock *csk = ctx;
 711
 712         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 713                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 714                 rpl->status, csk, csk ? csk->state : 0,
 715                 csk ? csk->flags : 0UL);
 716         /*
 717          * Ignore replies to post-close aborts indicating that the abort was
 718          * requested too late.  These connections are terminated when we get
 719          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
 720          * arrives the TID is either no longer used or it has been recycled.
 721          */
 722         if (rpl->status == CPL_ERR_ABORT_FAILED)
 723                 goto rel_skb;
 724         /*
 725          * Sometimes we've already closed the connection, e.g., a post-close
 726          * abort races with ABORT_REQ_RSS, the latter frees the connection
 727          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
 728          * but FW turns the ABORT_REQ into a regular one and so we get
 729          * ABORT_RPL_RSS with status 0 and no connection.
 730          */
 731         if (csk)
 732                 cxgbi_sock_rcv_abort_rpl(csk);
 733 rel_skb:
 734         __kfree_skb(skb);
 735         return 0;
 736 }
 737
 738 /*
 739  * Process RX_ISCSI_HDR CPL message: -> host
 740  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 741  * follow after the bhs.
 742  */
 743 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
 744 {
 745         struct cxgbi_sock *csk = ctx;
 746         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
 747         struct cpl_iscsi_hdr_norss data_cpl;
 748         struct cpl_rx_data_ddp_norss ddp_cpl;
 749         unsigned int hdr_len, data_len, status;
 750         unsigned int len;
 751         int err;
 752
 753         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 754                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
 755                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
 756
 757         spin_lock_bh(&csk->lock);
 758
 759         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 760                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 761                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 762                         csk, csk->state, csk->flags, csk->tid);
 763                 if (csk->state != CTP_ABORTING)
 764                         goto abort_conn;
 765                 else
 766                         goto discard;
 767         }
 768
 769         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
 770         cxgbi_skcb_flags(skb) = 0;
 771
 772         skb_reset_transport_header(skb);
 773         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
 774
 775         len = hdr_len = ntohs(hdr_cpl->len);
 776         /* msg coalesce is off or not enough data received */
 777         if (skb->len <= hdr_len) {
 778                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
 779                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 780                         skb->len, hdr_len);
 781                 goto abort_conn;
 782         }
 783         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
 784
 785         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
 786                             sizeof(ddp_cpl));
 787         if (err < 0) {
 788                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
 789                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 790                         skb->len, sizeof(ddp_cpl), err);
 791                 goto abort_conn;
 792         }
 793
 794         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
 795         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
 796         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
 797         status = ntohl(ddp_cpl.ddp_status);
 798
 799         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 800                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
 801                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
 802
 803         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
 804                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
 805         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
 806                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
 807         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
 808                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
 809
 810         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
 811                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
 812                 if (err < 0) {
 813                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
 814                                 csk->cdev->ports[csk->port_id]->name,
 815                                 csk->tid, sizeof(data_cpl), skb->len, err);
 816                         goto abort_conn;
 817                 }
 818                 data_len = ntohs(data_cpl.len);
 819                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
 820                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
 821                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
 822                 len += sizeof(data_cpl) + data_len;
 823         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
 824                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
 825
 826         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
 827         __pskb_trim(skb, len);
 828         __skb_queue_tail(&csk->receive_queue, skb);
 829         cxgbi_conn_pdu_ready(csk);
 830
 831         spin_unlock_bh(&csk->lock);
 832         return 0;
 833
 834 abort_conn:
 835         send_abort_req(csk);
 836 discard:
 837         spin_unlock_bh(&csk->lock);
 838         __kfree_skb(skb);
 839         return 0;
 840 }
 841
 842 /*
 843  * Process TX_DATA_ACK CPL messages: -> host
 844  * Process an acknowledgment of WR completion.  Advance snd_una and send the
 845  * next batch of work requests from the write queue.
 846  */
 847 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 848 {
 849         struct cxgbi_sock *csk = ctx;
 850         struct cpl_wr_ack *hdr = cplhdr(skb);
 851
 852         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 853                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
 854                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
 855
 856         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
 857         __kfree_skb(skb);
 858         return 0;
 859 }
 860
 861 /*
 862  * for each connection, pre-allocate skbs needed for close/abort requests. So
 863  * that we can service the request right away.
 864  */
 865 static int alloc_cpls(struct cxgbi_sock *csk)
 866 {
 867         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
 868                                         GFP_KERNEL);
 869         if (!csk->cpl_close)
 870                 return -ENOMEM;
 871         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
 872                                         GFP_KERNEL);
 873         if (!csk->cpl_abort_req)
 874                 goto free_cpl_skbs;
 875
 876         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
 877                                         GFP_KERNEL);
 878         if (!csk->cpl_abort_rpl)
 879                 goto free_cpl_skbs;
 880
 881         return 0;
 882
 883 free_cpl_skbs:
 884         cxgbi_sock_free_cpl_skbs(csk);
 885         return -ENOMEM;
 886 }
 887
 888 /**
 889  * release_offload_resources - release offload resource
 890  * @c3cn: the offloaded iscsi tcp connection.
 891  * Release resources held by an offload connection (TID, L2T entry, etc.)
 892  */
 893 static void l2t_put(struct cxgbi_sock *csk)
 894 {
 895         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 896
 897         if (csk->l2t) {
 898                 l2t_release(t3dev, csk->l2t);
 899                 csk->l2t = NULL;
 900                 cxgbi_sock_put(csk);
 901         }
 902 }
 903
 904 static void release_offload_resources(struct cxgbi_sock *csk)
 905 {
 906         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 907
 908         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 909                 "csk 0x%p,%u,0x%lx,%u.\n",
 910                 csk, csk->state, csk->flags, csk->tid);
 911
 912         csk->rss_qid = 0;
 913         cxgbi_sock_free_cpl_skbs(csk);
 914
 915         if (csk->wr_cred != csk->wr_max_cred) {
 916                 cxgbi_sock_purge_wr_queue(csk);
 917                 cxgbi_sock_reset_wr_list(csk);
 918         }
 919         l2t_put(csk);
 920         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
 921                 free_atid(csk);
 922         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
 923                 cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
 924                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
 925                 cxgbi_sock_put(csk);
 926         }
 927         csk->dst = NULL;
 928         csk->cdev = NULL;
 929 }
 930
 931 static void update_address(struct cxgbi_hba *chba)
 932 {
 933         if (chba->ipv4addr) {
 934                 if (chba->vdev &&
 935                     chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
 936                         cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
 937                         cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 938                         pr_info("%s set %pI4.\n",
 939                                 chba->vdev->name, &chba->ipv4addr);
 940                 } else if (chba->ipv4addr !=
 941                                 cxgb3i_get_private_ipv4addr(chba->ndev)) {
 942                         cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
 943                         pr_info("%s set %pI4.\n",
 944                                 chba->ndev->name, &chba->ipv4addr);
 945                 }
 946         } else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
 947                 if (chba->vdev)
 948                         cxgb3i_set_private_ipv4addr(chba->vdev, 0);
 949                 cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 950         }
 951 }
 952
 953 static int init_act_open(struct cxgbi_sock *csk)
 954 {
 955         struct dst_entry *dst = csk->dst;
 956         struct cxgbi_device *cdev = csk->cdev;
 957         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
 958         struct net_device *ndev = cdev->ports[csk->port_id];
 959         struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
 960         struct sk_buff *skb = NULL;
 961
 962         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 963                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
 964
 965         update_address(chba);
 966         if (chba->ipv4addr)
 967                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
 968
 969         csk->rss_qid = 0;
 970         csk->l2t = t3_l2t_get(t3dev, dst, ndev,
 971                               &csk->daddr.sin_addr.s_addr);
 972         if (!csk->l2t) {
 973                 pr_err("NO l2t available.\n");
 974                 return -EINVAL;
 975         }
 976         cxgbi_sock_get(csk);
 977
 978         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 979         if (csk->atid < 0) {
 980                 pr_err("NO atid available.\n");
 981                 goto rel_resource;
 982         }
 983         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 984         cxgbi_sock_get(csk);
 985
 986         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
 987         if (!skb)
 988                 goto rel_resource;
 989         skb->sk = (struct sock *)csk;
 990         set_arp_failure_handler(skb, act_open_arp_failure);
 991
 992         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
 993         csk->wr_una_cred = 0;
 994         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
 995         cxgbi_sock_reset_wr_list(csk);
 996         csk->err = 0;
 997
 998         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 999                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
1000                 csk, csk->state, csk->flags,
1001                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1002                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1003
1004         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1005         send_act_open_req(csk, skb, csk->l2t);
1006         return 0;
1007
1008 rel_resource:
1009         if (skb)
1010                 __kfree_skb(skb);
1011         return -EINVAL;
1012 }
1013
1014 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1015         [CPL_ACT_ESTABLISH] = do_act_establish,
1016         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1017         [CPL_PEER_CLOSE] = do_peer_close,
1018         [CPL_ABORT_REQ_RSS] = do_abort_req,
1019         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1020         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1021         [CPL_TX_DMA_ACK] = do_wr_ack,
1022         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1023 };
1024
1025 /**
1026  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1027  * @cdev:       cxgbi adapter
1028  */
1029 int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1030 {
1031         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1032         struct adap_ports port;
1033         struct ofld_page_info rx_page_info;
1034         unsigned int wr_len;
1035         int rc;
1036
1037         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1038             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1039             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1040                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1041                 return -EINVAL;
1042         }
1043
1044         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1045                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1046
1047         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1048                                         cxgb3i_max_connect);
1049         if (rc < 0)
1050                 return rc;
1051
1052         init_wr_tab(wr_len);
1053         cdev->csk_release_offload_resources = release_offload_resources;
1054         cdev->csk_push_tx_frames = push_tx_frames;
1055         cdev->csk_send_abort_req = send_abort_req;
1056         cdev->csk_send_close_req = send_close_req;
1057         cdev->csk_send_rx_credits = send_rx_credits;
1058         cdev->csk_alloc_cpls = alloc_cpls;
1059         cdev->csk_init_act_open = init_act_open;
1060
1061         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1062         return 0;
1063 }
1064
1065 /*
1066  * functions to program the pagepod in h/w
1067  */
1068 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1069 {
1070         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1071
1072         memset(req, 0, sizeof(*req));
1073
1074         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1075         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1076                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1077         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
1078                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
1079 }
1080
1081 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1082                         unsigned int idx, unsigned int npods,
1083                                 struct cxgbi_gather_list *gl)
1084 {
1085         struct cxgbi_device *cdev = csk->cdev;
1086         struct cxgbi_ddp_info *ddp = cdev->ddp;
1087         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1088         int i;
1089
1090         log_debug(1 << CXGBI_DBG_DDP,
1091                 "csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
1092                 csk, idx, npods, gl);
1093
1094         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1095                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1096                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1097
1098                 if (!skb)
1099                         return -ENOMEM;
1100
1101                 ulp_mem_io_set_hdr(skb, pm_addr);
1102                 cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
1103                                         sizeof(struct ulp_mem_io)),
1104                                    hdr, gl, i * PPOD_PAGES_MAX);
1105                 skb->priority = CPL_PRIORITY_CONTROL;
1106                 cxgb3_ofld_send(cdev->lldev, skb);
1107         }
1108         return 0;
1109 }
1110
1111 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1112                           unsigned int idx, unsigned int npods)
1113 {
1114         struct cxgbi_device *cdev = chba->cdev;
1115         struct cxgbi_ddp_info *ddp = cdev->ddp;
1116         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1117         int i;
1118
1119         log_debug(1 << CXGBI_DBG_DDP,
1120                 "cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
1121                 cdev, idx, npods, tag);
1122
1123         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1124                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1125                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1126
1127                 if (!skb) {
1128                         pr_err("tag 0x%x, 0x%x, %d/%u, skb OOM.\n",
1129                                 tag, idx, i, npods);
1130                         continue;
1131                 }
1132                 ulp_mem_io_set_hdr(skb, pm_addr);
1133                 skb->priority = CPL_PRIORITY_CONTROL;
1134                 cxgb3_ofld_send(cdev->lldev, skb);
1135         }
1136 }
1137
1138 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1139                                        unsigned int tid, int pg_idx, bool reply)
1140 {
1141         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1142                                         GFP_KERNEL);
1143         struct cpl_set_tcb_field *req;
1144         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1145
1146         log_debug(1 << CXGBI_DBG_DDP,
1147                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1148         if (!skb)
1149                 return -ENOMEM;
1150
1151         /* set up ulp submode and page size */
1152         req = (struct cpl_set_tcb_field *)skb->head;
1153         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1154         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1155         req->reply = V_NO_REPLY(reply ? 0 : 1);
1156         req->cpu_idx = 0;
1157         req->word = htons(31);
1158         req->mask = cpu_to_be64(0xF0000000);
1159         req->val = cpu_to_be64(val << 28);
1160         skb->priority = CPL_PRIORITY_CONTROL;
1161
1162         cxgb3_ofld_send(csk->cdev->lldev, skb);
1163         return 0;
1164 }
1165
1166 /**
1167  * cxgb3i_setup_conn_digest - setup conn. digest setting
1168  * @csk: cxgb tcp socket
1169  * @tid: connection id
1170  * @hcrc: header digest enabled
1171  * @dcrc: data digest enabled
1172  * @reply: request reply from h/w
1173  * set up the iscsi digest settings for a connection identified by tid
1174  */
1175 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1176                              int hcrc, int dcrc, int reply)
1177 {
1178         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1179                                         GFP_KERNEL);
1180         struct cpl_set_tcb_field *req;
1181         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1182
1183         log_debug(1 << CXGBI_DBG_DDP,
1184                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1185         if (!skb)
1186                 return -ENOMEM;
1187
1188         /* set up ulp submode and page size */
1189         req = (struct cpl_set_tcb_field *)skb->head;
1190         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1191         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1192         req->reply = V_NO_REPLY(reply ? 0 : 1);
1193         req->cpu_idx = 0;
1194         req->word = htons(31);
1195         req->mask = cpu_to_be64(0x0F000000);
1196         req->val = cpu_to_be64(val << 24);
1197         skb->priority = CPL_PRIORITY_CONTROL;
1198
1199         cxgb3_ofld_send(csk->cdev->lldev, skb);
1200         return 0;
1201 }
1202
1203 /**
1204  * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
1205  * @cdev: cxgb3i adapter
1206  * release all the resource held by the ddp pagepod manager for a given
1207  * adapter if needed
1208  */
1209
1210 static void t3_ddp_cleanup(struct cxgbi_device *cdev)
1211 {
1212         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1213
1214         if (cxgbi_ddp_cleanup(cdev)) {
1215                 pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
1216                 tdev->ulp_iscsi = NULL;
1217         }
1218 }
1219
1220 /**
1221  * ddp_init - initialize the cxgb3 adapter's ddp resource
1222  * @cdev: cxgb3i adapter
1223  * initialize the ddp pagepod manager for a given adapter
1224  */
1225 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1226 {
1227         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1228         struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
1229         struct ulp_iscsi_info uinfo;
1230         unsigned int pgsz_factor[4];
1231         int i, err;
1232
1233         if (ddp) {
1234                 kref_get(&ddp->refcnt);
1235                 pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
1236                         tdev, tdev->ulp_iscsi);
1237                 cdev->ddp = ddp;
1238                 return -EALREADY;
1239         }
1240
1241         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1242         if (err < 0) {
1243                 pr_err("%s, failed to get iscsi param err=%d.\n",
1244                          tdev->name, err);
1245                 return err;
1246         }
1247
1248         err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
1249                         uinfo.max_txsz, uinfo.max_rxsz);
1250         if (err < 0)
1251                 return err;
1252
1253         ddp = cdev->ddp;
1254
1255         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1256         cxgbi_ddp_page_size_factor(pgsz_factor);
1257         for (i = 0; i < 4; i++)
1258                 uinfo.pgsz_factor[i] = pgsz_factor[i];
1259         uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
1260
1261         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1262         if (err < 0) {
1263                 pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
1264                         tdev->name, err);
1265                 cxgbi_ddp_cleanup(cdev);
1266                 return err;
1267         }
1268         tdev->ulp_iscsi = ddp;
1269
1270         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1271         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1272         cdev->csk_ddp_set = ddp_set_map;
1273         cdev->csk_ddp_clear = ddp_clear_map;
1274
1275         pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1276                 "%u/%u.\n",
1277                 tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1278                 ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
1279                 ddp->max_rxsz, uinfo.max_rxsz);
1280         return 0;
1281 }
1282
1283 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1284 {
1285         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1286
1287         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1288                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1289                 return;
1290         }
1291
1292         cxgbi_device_unregister(cdev);
1293 }
1294
1295 /**
1296  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1297  * @t3dev: t3cdev adapter
1298  */
1299 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1300 {
1301         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1302         struct adapter *adapter = tdev2adap(t3dev);
1303         int i, err;
1304
1305         if (cdev) {
1306                 pr_info("0x%p, updating.\n", cdev);
1307                 return;
1308         }
1309
1310         cdev = cxgbi_device_register(0, adapter->params.nports);
1311         if (!cdev) {
1312                 pr_warn("device 0x%p register failed.\n", t3dev);
1313                 return;
1314         }
1315
1316         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1317         cdev->lldev = t3dev;
1318         cdev->pdev = adapter->pdev;
1319         cdev->ports = adapter->port;
1320         cdev->nports = adapter->params.nports;
1321         cdev->mtus = adapter->params.mtus;
1322         cdev->nmtus = NMTUS;
1323         cdev->snd_win = cxgb3i_snd_win;
1324         cdev->rcv_win = cxgb3i_rcv_win;
1325         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1326         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1327         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1328         cdev->dev_ddp_cleanup = t3_ddp_cleanup;
1329         cdev->itp = &cxgb3i_iscsi_transport;
1330
1331         err = cxgb3i_ddp_init(cdev);
1332         if (err) {
1333                 pr_info("0x%p ddp init failed\n", cdev);
1334                 goto err_out;
1335         }
1336
1337         err = cxgb3i_ofld_init(cdev);
1338         if (err) {
1339                 pr_info("0x%p offload init failed\n", cdev);
1340                 goto err_out;
1341         }
1342
1343         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1344                                 &cxgb3i_host_template, cxgb3i_stt);
1345         if (err)
1346                 goto err_out;
1347
1348         for (i = 0; i < cdev->nports; i++)
1349                 cdev->hbas[i]->ipv4addr =
1350                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1351
1352         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1353                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1354         return;
1355
1356 err_out:
1357         cxgbi_device_unregister(cdev);
1358 }
1359
1360 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1361 {
1362         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1363
1364         log_debug(1 << CXGBI_DBG_TOE,
1365                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1366                 t3dev, cdev, event, port);
1367         if (!cdev)
1368                 return;
1369
1370         switch (event) {
1371         case OFFLOAD_STATUS_DOWN:
1372                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1373                 break;
1374         case OFFLOAD_STATUS_UP:
1375                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1376                 break;
1377         }
1378 }
1379
1380 /**
1381  * cxgb3i_init_module - module init entry point
1382  *
1383  * initialize any driver wide global data structures and register itself
1384  *      with the cxgb3 module
1385  */
1386 static int __init cxgb3i_init_module(void)
1387 {
1388         int rc;
1389
1390         printk(KERN_INFO "%s", version);
1391
1392         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1393         if (rc < 0)
1394                 return rc;
1395
1396         cxgb3_register_client(&t3_client);
1397         return 0;
1398 }
1399
1400 /**
1401  * cxgb3i_exit_module - module cleanup/exit entry point
1402  *
1403  * go through the driver hba list and for each hba, release any resource held.
1404  *      and unregisters iscsi transport and the cxgb3 module
1405  */
1406 static void __exit cxgb3i_exit_module(void)
1407 {
1408         cxgb3_unregister_client(&t3_client);
1409         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1410         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1411 }
1412
1413 module_init(cxgb3i_init_module);
1414 module_exit(cxgb3i_exit_module);