drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

   1 /*
   2  * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
   3  *
   4  * Copyright (C) 2003-2015 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      "2.0.1-ko"
  36 #define DRV_MODULE_RELDATE      "Apr. 2015"
  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(cxgb3i_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_timed_out   = iscsi_eh_cmd_timed_out,
  94         .eh_abort_handler = iscsi_eh_abort,
  95         .eh_device_reset_handler = iscsi_eh_device_reset,
  96         .eh_target_reset_handler = iscsi_eh_recover_target,
  97         .target_alloc   = iscsi_target_alloc,
  98         .use_clustering = DISABLE_CLUSTERING,
  99         .this_id        = -1,
 100         .track_queue_depth = 1,
 101 };
 102
 103 static struct iscsi_transport cxgb3i_iscsi_transport = {
 104         .owner          = THIS_MODULE,
 105         .name           = DRV_MODULE_NAME,
 106         /* owner and name should be set already */
 107         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 108                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 109                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 110         .attr_is_visible        = cxgbi_attr_is_visible,
 111         .get_host_param = cxgbi_get_host_param,
 112         .set_host_param = cxgbi_set_host_param,
 113         /* session management */
 114         .create_session = cxgbi_create_session,
 115         .destroy_session        = cxgbi_destroy_session,
 116         .get_session_param = iscsi_session_get_param,
 117         /* connection management */
 118         .create_conn    = cxgbi_create_conn,
 119         .bind_conn      = cxgbi_bind_conn,
 120         .destroy_conn   = iscsi_tcp_conn_teardown,
 121         .start_conn     = iscsi_conn_start,
 122         .stop_conn      = iscsi_conn_stop,
 123         .get_conn_param = iscsi_conn_get_param,
 124         .set_param      = cxgbi_set_conn_param,
 125         .get_stats      = cxgbi_get_conn_stats,
 126         /* pdu xmit req from user space */
 127         .send_pdu       = iscsi_conn_send_pdu,
 128         /* task */
 129         .init_task      = iscsi_tcp_task_init,
 130         .xmit_task      = iscsi_tcp_task_xmit,
 131         .cleanup_task   = cxgbi_cleanup_task,
 132         /* pdu */
 133         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 134         .init_pdu       = cxgbi_conn_init_pdu,
 135         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 136         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 137         /* TCP connect/disconnect */
 138         .get_ep_param   = cxgbi_get_ep_param,
 139         .ep_connect     = cxgbi_ep_connect,
 140         .ep_poll        = cxgbi_ep_poll,
 141         .ep_disconnect  = cxgbi_ep_disconnect,
 142         /* Error recovery timeout call */
 143         .session_recovery_timedout = iscsi_session_recovery_timedout,
 144 };
 145
 146 static struct scsi_transport_template *cxgb3i_stt;
 147
 148 /*
 149  * CPL (Chelsio Protocol Language) defines a message passing interface between
 150  * the host driver and Chelsio asic.
 151  * The section below implments CPLs that related to iscsi tcp connection
 152  * open/close/abort and data send/receive.
 153  */
 154
 155 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
 156
 157 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 158                               const struct l2t_entry *e)
 159 {
 160         unsigned int wscale = cxgbi_sock_compute_wscale(csk->rcv_win);
 161         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
 162
 163         skb->priority = CPL_PRIORITY_SETUP;
 164
 165         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 166         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
 167         req->local_port = csk->saddr.sin_port;
 168         req->peer_port = csk->daddr.sin_port;
 169         req->local_ip = csk->saddr.sin_addr.s_addr;
 170         req->peer_ip = csk->daddr.sin_addr.s_addr;
 171
 172         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
 173                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
 174                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
 175         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
 176                         V_RCV_BUFSIZ(csk->rcv_win >> 10));
 177
 178         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 179                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
 180                 csk, csk->state, csk->flags, csk->atid,
 181                 &req->local_ip, ntohs(req->local_port),
 182                 &req->peer_ip, ntohs(req->peer_port),
 183                 csk->mss_idx, e->idx, e->smt_idx);
 184
 185         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 186 }
 187
 188 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 189 {
 190         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
 191 }
 192
 193 /*
 194  * CPL connection close request: host ->
 195  *
 196  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 197  * the write queue (i.e., after any unsent txt data).
 198  */
 199 static void send_close_req(struct cxgbi_sock *csk)
 200 {
 201         struct sk_buff *skb = csk->cpl_close;
 202         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 203         unsigned int tid = csk->tid;
 204
 205         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 206                 "csk 0x%p,%u,0x%lx,%u.\n",
 207                 csk, csk->state, csk->flags, csk->tid);
 208
 209         csk->cpl_close = NULL;
 210         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
 211         req->wr.wr_lo = htonl(V_WR_TID(tid));
 212         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 213         req->rsvd = htonl(csk->write_seq);
 214
 215         cxgbi_sock_skb_entail(csk, skb);
 216         if (csk->state >= CTP_ESTABLISHED)
 217                 push_tx_frames(csk, 1);
 218 }
 219
 220 /*
 221  * CPL connection abort request: host ->
 222  *
 223  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 224  * for the same connection and also that we do not try to send a message
 225  * after the connection has closed.
 226  */
 227 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
 228 {
 229         struct cpl_abort_req *req = cplhdr(skb);
 230
 231         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 232                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
 233                 tdev, GET_TID(req), skb);
 234         req->cmd = CPL_ABORT_NO_RST;
 235         cxgb3_ofld_send(tdev, skb);
 236 }
 237
 238 static void send_abort_req(struct cxgbi_sock *csk)
 239 {
 240         struct sk_buff *skb = csk->cpl_abort_req;
 241         struct cpl_abort_req *req;
 242
 243         if (unlikely(csk->state == CTP_ABORTING || !skb))
 244                 return;
 245         cxgbi_sock_set_state(csk, CTP_ABORTING);
 246         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 247         /* Purge the send queue so we don't send anything after an abort. */
 248         cxgbi_sock_purge_write_queue(csk);
 249
 250         csk->cpl_abort_req = NULL;
 251         req = (struct cpl_abort_req *)skb->head;
 252         skb->priority = CPL_PRIORITY_DATA;
 253         set_arp_failure_handler(skb, abort_arp_failure);
 254         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
 255         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 256         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 257         req->rsvd0 = htonl(csk->snd_nxt);
 258         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 259         req->cmd = CPL_ABORT_SEND_RST;
 260
 261         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 262                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 263                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 264                 req->rsvd1);
 265
 266         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 267 }
 268
 269 /*
 270  * CPL connection abort reply: host ->
 271  *
 272  * Send an ABORT_RPL message in response of the ABORT_REQ received.
 273  */
 274 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 275 {
 276         struct sk_buff *skb = csk->cpl_abort_rpl;
 277         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 278
 279         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 280                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 281                 csk, csk->state, csk->flags, csk->tid, rst_status);
 282
 283         csk->cpl_abort_rpl = NULL;
 284         skb->priority = CPL_PRIORITY_DATA;
 285         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 286         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 287         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 288         rpl->cmd = rst_status;
 289         cxgb3_ofld_send(csk->cdev->lldev, skb);
 290 }
 291
 292 /*
 293  * CPL connection rx data ack: host ->
 294  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 295  * credits sent.
 296  */
 297 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 298 {
 299         struct sk_buff *skb;
 300         struct cpl_rx_data_ack *req;
 301         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
 302
 303         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 304                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
 305                 csk, csk->state, csk->flags, csk->tid, credits, dack);
 306
 307         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 308         if (!skb) {
 309                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 310                 return 0;
 311         }
 312         req = (struct cpl_rx_data_ack *)skb->head;
 313         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 314         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
 315         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
 316                                 V_RX_CREDITS(credits));
 317         skb->priority = CPL_PRIORITY_ACK;
 318         cxgb3_ofld_send(csk->cdev->lldev, skb);
 319         return credits;
 320 }
 321
 322 /*
 323  * CPL connection tx data: host ->
 324  *
 325  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 326  * credits sent.
 327  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 328  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 329  */
 330
 331 static unsigned int wrlen __read_mostly;
 332 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
 333
 334 static void init_wr_tab(unsigned int wr_len)
 335 {
 336         int i;
 337
 338         if (skb_wrs[1])         /* already initialized */
 339                 return;
 340         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
 341                 int sgl_len = (3 * i) / 2 + (i & 1);
 342
 343                 sgl_len += 3;
 344                 skb_wrs[i] = (sgl_len <= wr_len
 345                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
 346         }
 347         wrlen = wr_len * 8;
 348 }
 349
 350 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 351                                    int len, int req_completion)
 352 {
 353         struct tx_data_wr *req;
 354         struct l2t_entry *l2t = csk->l2t;
 355
 356         skb_reset_transport_header(skb);
 357         req = __skb_push(skb, sizeof(*req));
 358         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
 359                         (req_completion ? F_WR_COMPL : 0));
 360         req->wr_lo = htonl(V_WR_TID(csk->tid));
 361         /* len includes the length of any HW ULP additions */
 362         req->len = htonl(len);
 363         /* V_TX_ULP_SUBMODE sets both the mode and submode */
 364         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
 365                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
 366         req->sndseq = htonl(csk->snd_nxt);
 367         req->param = htonl(V_TX_PORT(l2t->smt_idx));
 368
 369         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 370                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
 371                                     V_TX_CPU_IDX(csk->rss_qid));
 372                 /* sendbuffer is in units of 32KB. */
 373                 req->param |= htonl(V_TX_SNDBUF(csk->snd_win >> 15));
 374                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 375         }
 376 }
 377
 378 /**
 379  * push_tx_frames -- start transmit
 380  * @c3cn: the offloaded connection
 381  * @req_completion: request wr_ack or not
 382  *
 383  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 384  * connection's send queue and sends them on to T3.  Must be called with the
 385  * connection's lock held.  Returns the amount of send buffer space that was
 386  * freed as a result of sending queued data to T3.
 387  */
 388
 389 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
 390 {
 391         kfree_skb(skb);
 392 }
 393
 394 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 395 {
 396         int total_size = 0;
 397         struct sk_buff *skb;
 398
 399         if (unlikely(csk->state < CTP_ESTABLISHED ||
 400                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 401                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 402                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 403                                 csk, csk->state, csk->flags, csk->tid);
 404                 return 0;
 405         }
 406
 407         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 408                 int len = skb->len;     /* length before skb_push */
 409                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
 410                 int wrs_needed = skb_wrs[frags];
 411
 412                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
 413                         wrs_needed = 1;
 414
 415                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
 416
 417                 if (csk->wr_cred < wrs_needed) {
 418                         log_debug(1 << CXGBI_DBG_PDU_TX,
 419                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
 420                                 csk, skb->len, skb->data_len, frags,
 421                                 wrs_needed, csk->wr_cred);
 422                         break;
 423                 }
 424
 425                 __skb_unlink(skb, &csk->write_queue);
 426                 skb->priority = CPL_PRIORITY_DATA;
 427                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
 428                 csk->wr_cred -= wrs_needed;
 429                 csk->wr_una_cred += wrs_needed;
 430                 cxgbi_sock_enqueue_wr(csk, skb);
 431
 432                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 433                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
 434                         "left %u, unack %u.\n",
 435                         csk, skb->len, skb->data_len, frags, skb->csum,
 436                         csk->wr_cred, csk->wr_una_cred);
 437
 438                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 439                         if ((req_completion &&
 440                                 csk->wr_una_cred == wrs_needed) ||
 441                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
 442                                 req_completion = 1;
 443                                 csk->wr_una_cred = 0;
 444                         }
 445                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 446                         make_tx_data_wr(csk, skb, len, req_completion);
 447                         csk->snd_nxt += len;
 448                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 449                 }
 450                 total_size += skb->truesize;
 451                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 452                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
 453                         csk, csk->tid, skb);
 454                 set_arp_failure_handler(skb, arp_failure_skb_discard);
 455                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
 456         }
 457         return total_size;
 458 }
 459
 460 /*
 461  * Process a CPL_ACT_ESTABLISH message: -> host
 462  * Updates connection state from an active establish CPL message.  Runs with
 463  * the connection lock held.
 464  */
 465
 466 static inline void free_atid(struct cxgbi_sock *csk)
 467 {
 468         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 469                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
 470                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 471                 cxgbi_sock_put(csk);
 472         }
 473 }
 474
 475 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 476 {
 477         struct cxgbi_sock *csk = ctx;
 478         struct cpl_act_establish *req = cplhdr(skb);
 479         unsigned int tid = GET_TID(req);
 480         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 481         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
 482
 483         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 484                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 485                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
 486
 487         cxgbi_sock_get(csk);
 488         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 489         csk->tid = tid;
 490         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
 491
 492         free_atid(csk);
 493
 494         csk->rss_qid = G_QNUM(ntohs(skb->csum));
 495
 496         spin_lock_bh(&csk->lock);
 497         if (csk->retry_timer.function) {
 498                 del_timer(&csk->retry_timer);
 499                 csk->retry_timer.function = NULL;
 500         }
 501
 502         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 503                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 504                         csk, csk->state, csk->flags, csk->tid);
 505
 506         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 507         if (csk->rcv_win > (M_RCV_BUFSIZ << 10))
 508                 csk->rcv_wup -= csk->rcv_win - (M_RCV_BUFSIZ << 10);
 509
 510         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 511
 512         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 513                 /* upper layer has requested closing */
 514                 send_abort_req(csk);
 515         else {
 516                 if (skb_queue_len(&csk->write_queue))
 517                         push_tx_frames(csk, 1);
 518                 cxgbi_conn_tx_open(csk);
 519         }
 520
 521         spin_unlock_bh(&csk->lock);
 522         __kfree_skb(skb);
 523         return 0;
 524 }
 525
 526 /*
 527  * Process a CPL_ACT_OPEN_RPL message: -> host
 528  * Handle active open failures.
 529  */
 530 static int act_open_rpl_status_to_errno(int status)
 531 {
 532         switch (status) {
 533         case CPL_ERR_CONN_RESET:
 534                 return -ECONNREFUSED;
 535         case CPL_ERR_ARP_MISS:
 536                 return -EHOSTUNREACH;
 537         case CPL_ERR_CONN_TIMEDOUT:
 538                 return -ETIMEDOUT;
 539         case CPL_ERR_TCAM_FULL:
 540                 return -ENOMEM;
 541         case CPL_ERR_CONN_EXIST:
 542                 return -EADDRINUSE;
 543         default:
 544                 return -EIO;
 545         }
 546 }
 547
 548 static void act_open_retry_timer(struct timer_list *t)
 549 {
 550         struct cxgbi_sock *csk = from_timer(csk, t, retry_timer);
 551         struct sk_buff *skb;
 552
 553         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 554                 "csk 0x%p,%u,0x%lx,%u.\n",
 555                 csk, csk->state, csk->flags, csk->tid);
 556
 557         cxgbi_sock_get(csk);
 558         spin_lock_bh(&csk->lock);
 559         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 560         if (!skb)
 561                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 562         else {
 563                 skb->sk = (struct sock *)csk;
 564                 set_arp_failure_handler(skb, act_open_arp_failure);
 565                 send_act_open_req(csk, skb, csk->l2t);
 566         }
 567         spin_unlock_bh(&csk->lock);
 568         cxgbi_sock_put(csk);
 569 }
 570
 571 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 572 {
 573         struct cxgbi_sock *csk = ctx;
 574         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 575
 576         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
 577                 csk, csk->state, csk->flags, csk->atid, rpl->status,
 578                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 579                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
 580
 581         if (rpl->status != CPL_ERR_TCAM_FULL &&
 582             rpl->status != CPL_ERR_CONN_EXIST &&
 583             rpl->status != CPL_ERR_ARP_MISS)
 584                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
 585
 586         cxgbi_sock_get(csk);
 587         spin_lock_bh(&csk->lock);
 588         if (rpl->status == CPL_ERR_CONN_EXIST &&
 589             csk->retry_timer.function != (TIMER_FUNC_TYPE)act_open_retry_timer) {
 590                 csk->retry_timer.function = (TIMER_FUNC_TYPE)act_open_retry_timer;
 591                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 592         } else
 593                 cxgbi_sock_fail_act_open(csk,
 594                                 act_open_rpl_status_to_errno(rpl->status));
 595
 596         spin_unlock_bh(&csk->lock);
 597         cxgbi_sock_put(csk);
 598         __kfree_skb(skb);
 599         return 0;
 600 }
 601
 602 /*
 603  * Process PEER_CLOSE CPL messages: -> host
 604  * Handle peer FIN.
 605  */
 606 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 607 {
 608         struct cxgbi_sock *csk = ctx;
 609
 610         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 611                 "csk 0x%p,%u,0x%lx,%u.\n",
 612                 csk, csk->state, csk->flags, csk->tid);
 613
 614         cxgbi_sock_rcv_peer_close(csk);
 615         __kfree_skb(skb);
 616         return 0;
 617 }
 618
 619 /*
 620  * Process CLOSE_CONN_RPL CPL message: -> host
 621  * Process a peer ACK to our FIN.
 622  */
 623 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
 624                             void *ctx)
 625 {
 626         struct cxgbi_sock *csk = ctx;
 627         struct cpl_close_con_rpl *rpl = cplhdr(skb);
 628
 629         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 630                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
 631                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
 632
 633         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 634         __kfree_skb(skb);
 635         return 0;
 636 }
 637
 638 /*
 639  * Process ABORT_REQ_RSS CPL message: -> host
 640  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 641  * request except that we need to reply to it.
 642  */
 643
 644 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 645                                  int *need_rst)
 646 {
 647         switch (abort_reason) {
 648         case CPL_ERR_BAD_SYN: /* fall through */
 649         case CPL_ERR_CONN_RESET:
 650                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
 651         case CPL_ERR_XMIT_TIMEDOUT:
 652         case CPL_ERR_PERSIST_TIMEDOUT:
 653         case CPL_ERR_FINWAIT2_TIMEDOUT:
 654         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 655                 return -ETIMEDOUT;
 656         default:
 657                 return -EIO;
 658         }
 659 }
 660
 661 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 662 {
 663         const struct cpl_abort_req_rss *req = cplhdr(skb);
 664         struct cxgbi_sock *csk = ctx;
 665         int rst_status = CPL_ABORT_NO_RST;
 666
 667         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 668                 "csk 0x%p,%u,0x%lx,%u.\n",
 669                 csk, csk->state, csk->flags, csk->tid);
 670
 671         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 672             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
 673                 goto done;
 674         }
 675
 676         cxgbi_sock_get(csk);
 677         spin_lock_bh(&csk->lock);
 678
 679         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 680                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 681                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 682                 goto out;
 683         }
 684
 685         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 686         send_abort_rpl(csk, rst_status);
 687
 688         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 689                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 690                 cxgbi_sock_closed(csk);
 691         }
 692
 693 out:
 694         spin_unlock_bh(&csk->lock);
 695         cxgbi_sock_put(csk);
 696 done:
 697         __kfree_skb(skb);
 698         return 0;
 699 }
 700
 701 /*
 702  * Process ABORT_RPL_RSS CPL message: -> host
 703  * Process abort replies.  We only process these messages if we anticipate
 704  * them as the coordination between SW and HW in this area is somewhat lacking
 705  * and sometimes we get ABORT_RPLs after we are done with the connection that
 706  * originated the ABORT_REQ.
 707  */
 708 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 709 {
 710         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
 711         struct cxgbi_sock *csk = ctx;
 712
 713         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 714                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 715                 rpl->status, csk, csk ? csk->state : 0,
 716                 csk ? csk->flags : 0UL);
 717         /*
 718          * Ignore replies to post-close aborts indicating that the abort was
 719          * requested too late.  These connections are terminated when we get
 720          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
 721          * arrives the TID is either no longer used or it has been recycled.
 722          */
 723         if (rpl->status == CPL_ERR_ABORT_FAILED)
 724                 goto rel_skb;
 725         /*
 726          * Sometimes we've already closed the connection, e.g., a post-close
 727          * abort races with ABORT_REQ_RSS, the latter frees the connection
 728          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
 729          * but FW turns the ABORT_REQ into a regular one and so we get
 730          * ABORT_RPL_RSS with status 0 and no connection.
 731          */
 732         if (csk)
 733                 cxgbi_sock_rcv_abort_rpl(csk);
 734 rel_skb:
 735         __kfree_skb(skb);
 736         return 0;
 737 }
 738
 739 /*
 740  * Process RX_ISCSI_HDR CPL message: -> host
 741  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 742  * follow after the bhs.
 743  */
 744 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
 745 {
 746         struct cxgbi_sock *csk = ctx;
 747         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
 748         struct cpl_iscsi_hdr_norss data_cpl;
 749         struct cpl_rx_data_ddp_norss ddp_cpl;
 750         unsigned int hdr_len, data_len, status;
 751         unsigned int len;
 752         int err;
 753
 754         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 755                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
 756                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
 757
 758         spin_lock_bh(&csk->lock);
 759
 760         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 761                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 762                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 763                         csk, csk->state, csk->flags, csk->tid);
 764                 if (csk->state != CTP_ABORTING)
 765                         goto abort_conn;
 766                 else
 767                         goto discard;
 768         }
 769
 770         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
 771         cxgbi_skcb_flags(skb) = 0;
 772
 773         skb_reset_transport_header(skb);
 774         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
 775
 776         len = hdr_len = ntohs(hdr_cpl->len);
 777         /* msg coalesce is off or not enough data received */
 778         if (skb->len <= hdr_len) {
 779                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
 780                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 781                         skb->len, hdr_len);
 782                 goto abort_conn;
 783         }
 784         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
 785
 786         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
 787                             sizeof(ddp_cpl));
 788         if (err < 0) {
 789                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
 790                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 791                         skb->len, sizeof(ddp_cpl), err);
 792                 goto abort_conn;
 793         }
 794
 795         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
 796         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
 797         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
 798         status = ntohl(ddp_cpl.ddp_status);
 799
 800         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 801                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
 802                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
 803
 804         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
 805                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
 806         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
 807                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
 808         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
 809                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
 810
 811         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
 812                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
 813                 if (err < 0) {
 814                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
 815                                 csk->cdev->ports[csk->port_id]->name,
 816                                 csk->tid, sizeof(data_cpl), skb->len, err);
 817                         goto abort_conn;
 818                 }
 819                 data_len = ntohs(data_cpl.len);
 820                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
 821                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
 822                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
 823                 len += sizeof(data_cpl) + data_len;
 824         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
 825                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
 826
 827         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
 828         __pskb_trim(skb, len);
 829         __skb_queue_tail(&csk->receive_queue, skb);
 830         cxgbi_conn_pdu_ready(csk);
 831
 832         spin_unlock_bh(&csk->lock);
 833         return 0;
 834
 835 abort_conn:
 836         send_abort_req(csk);
 837 discard:
 838         spin_unlock_bh(&csk->lock);
 839         __kfree_skb(skb);
 840         return 0;
 841 }
 842
 843 /*
 844  * Process TX_DATA_ACK CPL messages: -> host
 845  * Process an acknowledgment of WR completion.  Advance snd_una and send the
 846  * next batch of work requests from the write queue.
 847  */
 848 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 849 {
 850         struct cxgbi_sock *csk = ctx;
 851         struct cpl_wr_ack *hdr = cplhdr(skb);
 852
 853         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 854                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
 855                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
 856
 857         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
 858         __kfree_skb(skb);
 859         return 0;
 860 }
 861
 862 /*
 863  * for each connection, pre-allocate skbs needed for close/abort requests. So
 864  * that we can service the request right away.
 865  */
 866 static int alloc_cpls(struct cxgbi_sock *csk)
 867 {
 868         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
 869                                         GFP_KERNEL);
 870         if (!csk->cpl_close)
 871                 return -ENOMEM;
 872         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
 873                                         GFP_KERNEL);
 874         if (!csk->cpl_abort_req)
 875                 goto free_cpl_skbs;
 876
 877         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
 878                                         GFP_KERNEL);
 879         if (!csk->cpl_abort_rpl)
 880                 goto free_cpl_skbs;
 881
 882         return 0;
 883
 884 free_cpl_skbs:
 885         cxgbi_sock_free_cpl_skbs(csk);
 886         return -ENOMEM;
 887 }
 888
 889 /**
 890  * release_offload_resources - release offload resource
 891  * @c3cn: the offloaded iscsi tcp connection.
 892  * Release resources held by an offload connection (TID, L2T entry, etc.)
 893  */
 894 static void l2t_put(struct cxgbi_sock *csk)
 895 {
 896         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 897
 898         if (csk->l2t) {
 899                 l2t_release(t3dev, csk->l2t);
 900                 csk->l2t = NULL;
 901                 cxgbi_sock_put(csk);
 902         }
 903 }
 904
 905 static void release_offload_resources(struct cxgbi_sock *csk)
 906 {
 907         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 908
 909         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 910                 "csk 0x%p,%u,0x%lx,%u.\n",
 911                 csk, csk->state, csk->flags, csk->tid);
 912
 913         csk->rss_qid = 0;
 914         cxgbi_sock_free_cpl_skbs(csk);
 915
 916         if (csk->wr_cred != csk->wr_max_cred) {
 917                 cxgbi_sock_purge_wr_queue(csk);
 918                 cxgbi_sock_reset_wr_list(csk);
 919         }
 920         l2t_put(csk);
 921         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
 922                 free_atid(csk);
 923         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
 924                 cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
 925                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
 926                 cxgbi_sock_put(csk);
 927         }
 928         csk->dst = NULL;
 929         csk->cdev = NULL;
 930 }
 931
 932 static void update_address(struct cxgbi_hba *chba)
 933 {
 934         if (chba->ipv4addr) {
 935                 if (chba->vdev &&
 936                     chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
 937                         cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
 938                         cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 939                         pr_info("%s set %pI4.\n",
 940                                 chba->vdev->name, &chba->ipv4addr);
 941                 } else if (chba->ipv4addr !=
 942                                 cxgb3i_get_private_ipv4addr(chba->ndev)) {
 943                         cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
 944                         pr_info("%s set %pI4.\n",
 945                                 chba->ndev->name, &chba->ipv4addr);
 946                 }
 947         } else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
 948                 if (chba->vdev)
 949                         cxgb3i_set_private_ipv4addr(chba->vdev, 0);
 950                 cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 951         }
 952 }
 953
 954 static int init_act_open(struct cxgbi_sock *csk)
 955 {
 956         struct dst_entry *dst = csk->dst;
 957         struct cxgbi_device *cdev = csk->cdev;
 958         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
 959         struct net_device *ndev = cdev->ports[csk->port_id];
 960         struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
 961         struct sk_buff *skb = NULL;
 962
 963         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 964                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
 965
 966         update_address(chba);
 967         if (chba->ipv4addr)
 968                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
 969
 970         csk->rss_qid = 0;
 971         csk->l2t = t3_l2t_get(t3dev, dst, ndev,
 972                               &csk->daddr.sin_addr.s_addr);
 973         if (!csk->l2t) {
 974                 pr_err("NO l2t available.\n");
 975                 return -EINVAL;
 976         }
 977         cxgbi_sock_get(csk);
 978
 979         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 980         if (csk->atid < 0) {
 981                 pr_err("NO atid available.\n");
 982                 goto rel_resource;
 983         }
 984         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 985         cxgbi_sock_get(csk);
 986
 987         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
 988         if (!skb)
 989                 goto rel_resource;
 990         skb->sk = (struct sock *)csk;
 991         set_arp_failure_handler(skb, act_open_arp_failure);
 992         csk->snd_win = cxgb3i_snd_win;
 993         csk->rcv_win = cxgb3i_rcv_win;
 994
 995         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
 996         csk->wr_una_cred = 0;
 997         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
 998         cxgbi_sock_reset_wr_list(csk);
 999         csk->err = 0;
1000
1001         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1002                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
1003                 csk, csk->state, csk->flags,
1004                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1005                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1006
1007         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1008         send_act_open_req(csk, skb, csk->l2t);
1009         return 0;
1010
1011 rel_resource:
1012         if (skb)
1013                 __kfree_skb(skb);
1014         return -EINVAL;
1015 }
1016
1017 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1018         [CPL_ACT_ESTABLISH] = do_act_establish,
1019         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1020         [CPL_PEER_CLOSE] = do_peer_close,
1021         [CPL_ABORT_REQ_RSS] = do_abort_req,
1022         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1023         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1024         [CPL_TX_DMA_ACK] = do_wr_ack,
1025         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1026 };
1027
1028 /**
1029  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1030  * @cdev:       cxgbi adapter
1031  */
1032 static int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1033 {
1034         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1035         struct adap_ports port;
1036         struct ofld_page_info rx_page_info;
1037         unsigned int wr_len;
1038         int rc;
1039
1040         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1041             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1042             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1043                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1044                 return -EINVAL;
1045         }
1046
1047         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1048                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1049
1050         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1051                                         cxgb3i_max_connect);
1052         if (rc < 0)
1053                 return rc;
1054
1055         init_wr_tab(wr_len);
1056         cdev->csk_release_offload_resources = release_offload_resources;
1057         cdev->csk_push_tx_frames = push_tx_frames;
1058         cdev->csk_send_abort_req = send_abort_req;
1059         cdev->csk_send_close_req = send_close_req;
1060         cdev->csk_send_rx_credits = send_rx_credits;
1061         cdev->csk_alloc_cpls = alloc_cpls;
1062         cdev->csk_init_act_open = init_act_open;
1063
1064         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1065         return 0;
1066 }
1067
1068 /*
1069  * functions to program the pagepod in h/w
1070  */
1071 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1072 {
1073         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1074
1075         memset(req, 0, sizeof(*req));
1076
1077         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1078         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1079                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1080         req->len = htonl(V_ULP_MEMIO_DATA_LEN(IPPOD_SIZE >> 5) |
1081                          V_ULPTX_NFLITS((IPPOD_SIZE >> 3) + 1));
1082 }
1083
1084 static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
1085 {
1086         return ((struct t3cdev *)cdev->lldev)->ulp_iscsi;
1087 }
1088
1089 static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
1090                        struct cxgbi_task_tag_info *ttinfo)
1091 {
1092         unsigned int idx = ttinfo->idx;
1093         unsigned int npods = ttinfo->npods;
1094         struct scatterlist *sg = ttinfo->sgl;
1095         struct cxgbi_pagepod *ppod;
1096         struct ulp_mem_io *req;
1097         unsigned int sg_off;
1098         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
1099         int i;
1100
1101         for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
1102                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1103                                                IPPOD_SIZE, 0, GFP_ATOMIC);
1104
1105                 if (!skb)
1106                         return -ENOMEM;
1107                 ulp_mem_io_set_hdr(skb, pm_addr);
1108                 req = (struct ulp_mem_io *)skb->head;
1109                 ppod = (struct cxgbi_pagepod *)(req + 1);
1110                 sg_off = i * PPOD_PAGES_MAX;
1111                 cxgbi_ddp_set_one_ppod(ppod, ttinfo, &sg,
1112                                        &sg_off);
1113                 skb->priority = CPL_PRIORITY_CONTROL;
1114                 cxgb3_ofld_send(ppm->lldev, skb);
1115         }
1116         return 0;
1117 }
1118
1119 static void ddp_clear_map(struct cxgbi_device *cdev, struct cxgbi_ppm *ppm,
1120                           struct cxgbi_task_tag_info *ttinfo)
1121 {
1122         unsigned int idx = ttinfo->idx;
1123         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
1124         unsigned int npods = ttinfo->npods;
1125         int i;
1126
1127         log_debug(1 << CXGBI_DBG_DDP,
1128                   "cdev 0x%p, clear idx %u, npods %u.\n",
1129                   cdev, idx, npods);
1130
1131         for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
1132                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1133                                                IPPOD_SIZE, 0, GFP_ATOMIC);
1134
1135                 if (!skb) {
1136                         pr_err("cdev 0x%p, clear ddp, %u,%d/%u, skb OOM.\n",
1137                                cdev, idx, i, npods);
1138                         continue;
1139                 }
1140                 ulp_mem_io_set_hdr(skb, pm_addr);
1141                 skb->priority = CPL_PRIORITY_CONTROL;
1142                 cxgb3_ofld_send(ppm->lldev, skb);
1143         }
1144 }
1145
1146 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1147                                        unsigned int tid, int pg_idx, bool reply)
1148 {
1149         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1150                                         GFP_KERNEL);
1151         struct cpl_set_tcb_field *req;
1152         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1153
1154         log_debug(1 << CXGBI_DBG_DDP,
1155                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1156         if (!skb)
1157                 return -ENOMEM;
1158
1159         /* set up ulp submode and page size */
1160         req = (struct cpl_set_tcb_field *)skb->head;
1161         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1162         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1163         req->reply = V_NO_REPLY(reply ? 0 : 1);
1164         req->cpu_idx = 0;
1165         req->word = htons(31);
1166         req->mask = cpu_to_be64(0xF0000000);
1167         req->val = cpu_to_be64(val << 28);
1168         skb->priority = CPL_PRIORITY_CONTROL;
1169
1170         cxgb3_ofld_send(csk->cdev->lldev, skb);
1171         return 0;
1172 }
1173
1174 /**
1175  * cxgb3i_setup_conn_digest - setup conn. digest setting
1176  * @csk: cxgb tcp socket
1177  * @tid: connection id
1178  * @hcrc: header digest enabled
1179  * @dcrc: data digest enabled
1180  * @reply: request reply from h/w
1181  * set up the iscsi digest settings for a connection identified by tid
1182  */
1183 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1184                              int hcrc, int dcrc, int reply)
1185 {
1186         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1187                                         GFP_KERNEL);
1188         struct cpl_set_tcb_field *req;
1189         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1190
1191         log_debug(1 << CXGBI_DBG_DDP,
1192                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1193         if (!skb)
1194                 return -ENOMEM;
1195
1196         /* set up ulp submode and page size */
1197         req = (struct cpl_set_tcb_field *)skb->head;
1198         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1199         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1200         req->reply = V_NO_REPLY(reply ? 0 : 1);
1201         req->cpu_idx = 0;
1202         req->word = htons(31);
1203         req->mask = cpu_to_be64(0x0F000000);
1204         req->val = cpu_to_be64(val << 24);
1205         skb->priority = CPL_PRIORITY_CONTROL;
1206
1207         cxgb3_ofld_send(csk->cdev->lldev, skb);
1208         return 0;
1209 }
1210
1211 /**
1212  * cxgb3i_ddp_init - initialize the cxgb3 adapter's ddp resource
1213  * @cdev: cxgb3i adapter
1214  * initialize the ddp pagepod manager for a given adapter
1215  */
1216 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1217 {
1218         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1219         struct net_device *ndev = cdev->ports[0];
1220         struct cxgbi_tag_format tformat;
1221         unsigned int ppmax, tagmask = 0;
1222         struct ulp_iscsi_info uinfo;
1223         int i, err;
1224
1225         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1226         if (err < 0) {
1227                 pr_err("%s, failed to get iscsi param %d.\n",
1228                        ndev->name, err);
1229                 return err;
1230         }
1231         if (uinfo.llimit >= uinfo.ulimit) {
1232                 pr_warn("T3 %s, iscsi NOT enabled %u ~ %u!\n",
1233                         ndev->name, uinfo.llimit, uinfo.ulimit);
1234                 return -EACCES;
1235         }
1236
1237         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
1238         tagmask = cxgbi_tagmask_set(ppmax);
1239
1240         pr_info("T3 %s: 0x%x~0x%x, 0x%x, tagmask 0x%x -> 0x%x.\n",
1241                 ndev->name, uinfo.llimit, uinfo.ulimit, ppmax, uinfo.tagmask,
1242                 tagmask);
1243
1244         memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
1245         for (i = 0; i < 4; i++)
1246                 tformat.pgsz_order[i] = uinfo.pgsz_factor[i];
1247         cxgbi_tagmask_check(tagmask, &tformat);
1248
1249         cxgbi_ddp_ppm_setup(&tdev->ulp_iscsi, cdev, &tformat, ppmax,
1250                             uinfo.llimit, uinfo.llimit, 0);
1251         if (!(cdev->flags & CXGBI_FLAG_DDP_OFF)) {
1252                 uinfo.tagmask = tagmask;
1253                 uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
1254
1255                 err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1256                 if (err < 0) {
1257                         pr_err("T3 %s fail to set iscsi param %d.\n",
1258                                ndev->name, err);
1259                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1260                 }
1261                 err = 0;
1262         }
1263
1264         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1265         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1266         cdev->csk_ddp_set_map = ddp_set_map;
1267         cdev->csk_ddp_clear_map = ddp_clear_map;
1268         cdev->cdev2ppm = cdev2ppm;
1269         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1270                                   uinfo.max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1271         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1272                                   uinfo.max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1273
1274         return 0;
1275 }
1276
1277 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1278 {
1279         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1280
1281         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1282                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1283                 return;
1284         }
1285
1286         cxgbi_device_unregister(cdev);
1287 }
1288
1289 /**
1290  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1291  * @t3dev: t3cdev adapter
1292  */
1293 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1294 {
1295         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1296         struct adapter *adapter = tdev2adap(t3dev);
1297         int i, err;
1298
1299         if (cdev) {
1300                 pr_info("0x%p, updating.\n", cdev);
1301                 return;
1302         }
1303
1304         cdev = cxgbi_device_register(0, adapter->params.nports);
1305         if (!cdev) {
1306                 pr_warn("device 0x%p register failed.\n", t3dev);
1307                 return;
1308         }
1309
1310         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1311         cdev->lldev = t3dev;
1312         cdev->pdev = adapter->pdev;
1313         cdev->ports = adapter->port;
1314         cdev->nports = adapter->params.nports;
1315         cdev->mtus = adapter->params.mtus;
1316         cdev->nmtus = NMTUS;
1317         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1318         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1319         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1320         cdev->itp = &cxgb3i_iscsi_transport;
1321
1322         err = cxgb3i_ddp_init(cdev);
1323         if (err) {
1324                 pr_info("0x%p ddp init failed\n", cdev);
1325                 goto err_out;
1326         }
1327
1328         err = cxgb3i_ofld_init(cdev);
1329         if (err) {
1330                 pr_info("0x%p offload init failed\n", cdev);
1331                 goto err_out;
1332         }
1333
1334         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1335                                 &cxgb3i_host_template, cxgb3i_stt);
1336         if (err)
1337                 goto err_out;
1338
1339         for (i = 0; i < cdev->nports; i++)
1340                 cdev->hbas[i]->ipv4addr =
1341                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1342
1343         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1344                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1345         return;
1346
1347 err_out:
1348         cxgbi_device_unregister(cdev);
1349 }
1350
1351 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1352 {
1353         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1354
1355         log_debug(1 << CXGBI_DBG_TOE,
1356                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1357                 t3dev, cdev, event, port);
1358         if (!cdev)
1359                 return;
1360
1361         switch (event) {
1362         case OFFLOAD_STATUS_DOWN:
1363                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1364                 break;
1365         case OFFLOAD_STATUS_UP:
1366                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1367                 break;
1368         }
1369 }
1370
1371 /**
1372  * cxgb3i_init_module - module init entry point
1373  *
1374  * initialize any driver wide global data structures and register itself
1375  *      with the cxgb3 module
1376  */
1377 static int __init cxgb3i_init_module(void)
1378 {
1379         int rc;
1380
1381         printk(KERN_INFO "%s", version);
1382
1383         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1384         if (rc < 0)
1385                 return rc;
1386
1387         cxgb3_register_client(&t3_client);
1388         return 0;
1389 }
1390
1391 /**
1392  * cxgb3i_exit_module - module cleanup/exit entry point
1393  *
1394  * go through the driver hba list and for each hba, release any resource held.
1395  *      and unregisters iscsi transport and the cxgb3 module
1396  */
1397 static void __exit cxgb3i_exit_module(void)
1398 {
1399         cxgb3_unregister_client(&t3_client);
1400         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1401         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1402 }
1403
1404 module_init(cxgb3i_init_module);
1405 module_exit(cxgb3i_exit_module);