drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <linux/inetdevice.h>   /* ip_dev_find */
  28 #include <net/tcp.h>
  29
  30 static unsigned int dbg_level;
  31
  32 #include "libcxgbi.h"
  33
  34 #define DRV_MODULE_NAME         "libcxgbi"
  35 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  36 #define DRV_MODULE_VERSION      "0.9.0"
  37 #define DRV_MODULE_RELDATE      "Jun. 2010"
  38
  39 MODULE_AUTHOR("Chelsio Communications, Inc.");
  40 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  41 MODULE_VERSION(DRV_MODULE_VERSION);
  42 MODULE_LICENSE("GPL");
  43
  44 module_param(dbg_level, uint, 0644);
  45 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  46
  47
  48 /*
  49  * cxgbi device management
  50  * maintains a list of the cxgbi devices
  51  */
  52 static LIST_HEAD(cdev_list);
  53 static DEFINE_MUTEX(cdev_mutex);
  54
  55 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  56                                 unsigned int max_conn)
  57 {
  58         struct cxgbi_ports_map *pmap = &cdev->pmap;
  59
  60         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  61                                              sizeof(struct cxgbi_sock *),
  62                                              GFP_KERNEL);
  63         if (!pmap->port_csk) {
  64                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  65                 return -ENOMEM;
  66         }
  67
  68         pmap->max_connect = max_conn;
  69         pmap->sport_base = base;
  70         spin_lock_init(&pmap->lock);
  71         return 0;
  72 }
  73 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  74
  75 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  76 {
  77         struct cxgbi_ports_map *pmap = &cdev->pmap;
  78         struct cxgbi_sock *csk;
  79         int i;
  80
  81         for (i = 0; i < pmap->max_connect; i++) {
  82                 if (pmap->port_csk[i]) {
  83                         csk = pmap->port_csk[i];
  84                         pmap->port_csk[i] = NULL;
  85                         log_debug(1 << CXGBI_DBG_SOCK,
  86                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  87                                 csk, cdev);
  88                         spin_lock_bh(&csk->lock);
  89                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  90                         cxgbi_sock_closed(csk);
  91                         spin_unlock_bh(&csk->lock);
  92                         cxgbi_sock_put(csk);
  93                 }
  94         }
  95 }
  96 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
  97
  98 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
  99 {
 100         log_debug(1 << CXGBI_DBG_DEV,
 101                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 102         cxgbi_hbas_remove(cdev);
 103         cxgbi_device_portmap_cleanup(cdev);
 104         if (cdev->dev_ddp_cleanup)
 105                 cdev->dev_ddp_cleanup(cdev);
 106         else
 107                 cxgbi_ddp_cleanup(cdev);
 108         if (cdev->ddp)
 109                 cxgbi_ddp_cleanup(cdev);
 110         if (cdev->pmap.max_connect)
 111                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 112         kfree(cdev);
 113 }
 114
 115 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 116                                            unsigned int nports)
 117 {
 118         struct cxgbi_device *cdev;
 119
 120         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 121                         (sizeof(struct cxgbi_hba *) +
 122                          sizeof(struct net_device *)),
 123                         GFP_KERNEL);
 124         if (!cdev) {
 125                 pr_warn("nport %d, OOM.\n", nports);
 126                 return NULL;
 127         }
 128         cdev->ports = (struct net_device **)(cdev + 1);
 129         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 130                                                 sizeof(struct net_device *));
 131         if (extra)
 132                 cdev->dd_data = ((char *)cdev->hbas) +
 133                                 nports * sizeof(struct cxgbi_hba *);
 134         spin_lock_init(&cdev->pmap.lock);
 135
 136         mutex_lock(&cdev_mutex);
 137         list_add_tail(&cdev->list_head, &cdev_list);
 138         mutex_unlock(&cdev_mutex);
 139
 140         log_debug(1 << CXGBI_DBG_DEV,
 141                 "cdev 0x%p, p# %u.\n", cdev, nports);
 142         return cdev;
 143 }
 144 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 145
 146 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 147 {
 148         log_debug(1 << CXGBI_DBG_DEV,
 149                 "cdev 0x%p, p# %u,%s.\n",
 150                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 151         mutex_lock(&cdev_mutex);
 152         list_del(&cdev->list_head);
 153         mutex_unlock(&cdev_mutex);
 154         cxgbi_device_destroy(cdev);
 155 }
 156 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 157
 158 void cxgbi_device_unregister_all(unsigned int flag)
 159 {
 160         struct cxgbi_device *cdev, *tmp;
 161
 162         mutex_lock(&cdev_mutex);
 163         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 164                 if ((cdev->flags & flag) == flag) {
 165                         log_debug(1 << CXGBI_DBG_DEV,
 166                                 "cdev 0x%p, p# %u,%s.\n",
 167                                 cdev, cdev->nports, cdev->nports ?
 168                                  cdev->ports[0]->name : "");
 169                         list_del(&cdev->list_head);
 170                         cxgbi_device_destroy(cdev);
 171                 }
 172         }
 173         mutex_unlock(&cdev_mutex);
 174 }
 175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 176
 177 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 178 {
 179         struct cxgbi_device *cdev, *tmp;
 180
 181         mutex_lock(&cdev_mutex);
 182         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 183                 if (cdev->lldev == lldev) {
 184                         mutex_unlock(&cdev_mutex);
 185                         return cdev;
 186                 }
 187         }
 188         mutex_unlock(&cdev_mutex);
 189         log_debug(1 << CXGBI_DBG_DEV,
 190                 "lldev 0x%p, NO match found.\n", lldev);
 191         return NULL;
 192 }
 193 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 194
 195 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 196                                                         int *port)
 197 {
 198         struct net_device *vdev = NULL;
 199         struct cxgbi_device *cdev, *tmp;
 200         int i;
 201
 202         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 203                 vdev = ndev;
 204                 ndev = vlan_dev_real_dev(ndev);
 205                 log_debug(1 << CXGBI_DBG_DEV,
 206                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 207         }
 208
 209         mutex_lock(&cdev_mutex);
 210         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 211                 for (i = 0; i < cdev->nports; i++) {
 212                         if (ndev == cdev->ports[i]) {
 213                                 cdev->hbas[i]->vdev = vdev;
 214                                 mutex_unlock(&cdev_mutex);
 215                                 if (port)
 216                                         *port = i;
 217                                 return cdev;
 218                         }
 219                 }
 220         }
 221         mutex_unlock(&cdev_mutex);
 222         log_debug(1 << CXGBI_DBG_DEV,
 223                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 224         return NULL;
 225 }
 226
 227 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 228 {
 229         int i;
 230         struct cxgbi_hba *chba;
 231
 232         log_debug(1 << CXGBI_DBG_DEV,
 233                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 234
 235         for (i = 0; i < cdev->nports; i++) {
 236                 chba = cdev->hbas[i];
 237                 if (chba) {
 238                         cdev->hbas[i] = NULL;
 239                         iscsi_host_remove(chba->shost);
 240                         pci_dev_put(cdev->pdev);
 241                         iscsi_host_free(chba->shost);
 242                 }
 243         }
 244 }
 245 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 246
 247 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
 248                 unsigned int max_id, struct scsi_host_template *sht,
 249                 struct scsi_transport_template *stt)
 250 {
 251         struct cxgbi_hba *chba;
 252         struct Scsi_Host *shost;
 253         int i, err;
 254
 255         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 256
 257         for (i = 0; i < cdev->nports; i++) {
 258                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 259                 if (!shost) {
 260                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 261                                 cdev, i, cdev->ports[i]->name);
 262                         err = -ENOMEM;
 263                         goto err_out;
 264                 }
 265
 266                 shost->transportt = stt;
 267                 shost->max_lun = max_lun;
 268                 shost->max_id = max_id;
 269                 shost->max_channel = 0;
 270                 shost->max_cmd_len = 16;
 271
 272                 chba = iscsi_host_priv(shost);
 273                 chba->cdev = cdev;
 274                 chba->ndev = cdev->ports[i];
 275                 chba->shost = shost;
 276
 277                 log_debug(1 << CXGBI_DBG_DEV,
 278                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 279                         cdev, i, cdev->ports[i]->name, chba);
 280
 281                 pci_dev_get(cdev->pdev);
 282                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 283                 if (err) {
 284                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 285                                 cdev, i, cdev->ports[i]->name);
 286                         pci_dev_put(cdev->pdev);
 287                         scsi_host_put(shost);
 288                         goto  err_out;
 289                 }
 290
 291                 cdev->hbas[i] = chba;
 292         }
 293
 294         return 0;
 295
 296 err_out:
 297         cxgbi_hbas_remove(cdev);
 298         return err;
 299 }
 300 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 301
 302 /*
 303  * iSCSI offload
 304  *
 305  * - source port management
 306  *   To find a free source port in the port allocation map we use a very simple
 307  *   rotor scheme to look for the next free port.
 308  *
 309  *   If a source port has been specified make sure that it doesn't collide with
 310  *   our normal source port allocation map.  If it's outside the range of our
 311  *   allocation/deallocation scheme just let them use it.
 312  *
 313  *   If the source port is outside our allocation range, the caller is
 314  *   responsible for keeping track of their port usage.
 315  */
 316 static int sock_get_port(struct cxgbi_sock *csk)
 317 {
 318         struct cxgbi_device *cdev = csk->cdev;
 319         struct cxgbi_ports_map *pmap = &cdev->pmap;
 320         unsigned int start;
 321         int idx;
 322
 323         if (!pmap->max_connect) {
 324                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 325                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 326                 return -EADDRNOTAVAIL;
 327         }
 328
 329         if (csk->saddr.sin_port) {
 330                 pr_err("source port NON-ZERO %u.\n",
 331                         ntohs(csk->saddr.sin_port));
 332                 return -EADDRINUSE;
 333         }
 334
 335         spin_lock_bh(&pmap->lock);
 336         if (pmap->used >= pmap->max_connect) {
 337                 spin_unlock_bh(&pmap->lock);
 338                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 339                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 340                 return -EADDRNOTAVAIL;
 341         }
 342
 343         start = idx = pmap->next;
 344         do {
 345                 if (++idx >= pmap->max_connect)
 346                         idx = 0;
 347                 if (!pmap->port_csk[idx]) {
 348                         pmap->used++;
 349                         csk->saddr.sin_port =
 350                                 htons(pmap->sport_base + idx);
 351                         pmap->next = idx;
 352                         pmap->port_csk[idx] = csk;
 353                         spin_unlock_bh(&pmap->lock);
 354                         cxgbi_sock_get(csk);
 355                         log_debug(1 << CXGBI_DBG_SOCK,
 356                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 357                                 cdev, csk->port_id,
 358                                 cdev->ports[csk->port_id]->name,
 359                                 pmap->sport_base + idx, pmap->next);
 360                         return 0;
 361                 }
 362         } while (idx != start);
 363         spin_unlock_bh(&pmap->lock);
 364
 365         /* should not happen */
 366         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 367                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 368                 pmap->next);
 369         return -EADDRNOTAVAIL;
 370 }
 371
 372 static void sock_put_port(struct cxgbi_sock *csk)
 373 {
 374         struct cxgbi_device *cdev = csk->cdev;
 375         struct cxgbi_ports_map *pmap = &cdev->pmap;
 376
 377         if (csk->saddr.sin_port) {
 378                 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
 379
 380                 csk->saddr.sin_port = 0;
 381                 if (idx < 0 || idx >= pmap->max_connect) {
 382                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 383                                 cdev, csk->port_id,
 384                                 cdev->ports[csk->port_id]->name,
 385                                 ntohs(csk->saddr.sin_port));
 386                         return;
 387                 }
 388
 389                 spin_lock_bh(&pmap->lock);
 390                 pmap->port_csk[idx] = NULL;
 391                 pmap->used--;
 392                 spin_unlock_bh(&pmap->lock);
 393
 394                 log_debug(1 << CXGBI_DBG_SOCK,
 395                         "cdev 0x%p, p#%u %s, release %u.\n",
 396                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 397                         pmap->sport_base + idx);
 398
 399                 cxgbi_sock_put(csk);
 400         }
 401 }
 402
 403 /*
 404  * iscsi tcp connection
 405  */
 406 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 407 {
 408         if (csk->cpl_close) {
 409                 kfree_skb(csk->cpl_close);
 410                 csk->cpl_close = NULL;
 411         }
 412         if (csk->cpl_abort_req) {
 413                 kfree_skb(csk->cpl_abort_req);
 414                 csk->cpl_abort_req = NULL;
 415         }
 416         if (csk->cpl_abort_rpl) {
 417                 kfree_skb(csk->cpl_abort_rpl);
 418                 csk->cpl_abort_rpl = NULL;
 419         }
 420 }
 421 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 422
 423 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 424 {
 425         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 426
 427         if (!csk) {
 428                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 429                 return NULL;
 430         }
 431
 432         if (cdev->csk_alloc_cpls(csk) < 0) {
 433                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 434                 kfree(csk);
 435                 return NULL;
 436         }
 437
 438         spin_lock_init(&csk->lock);
 439         kref_init(&csk->refcnt);
 440         skb_queue_head_init(&csk->receive_queue);
 441         skb_queue_head_init(&csk->write_queue);
 442         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 443         rwlock_init(&csk->callback_lock);
 444         csk->cdev = cdev;
 445         csk->flags = 0;
 446         cxgbi_sock_set_state(csk, CTP_CLOSED);
 447
 448         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 449
 450         return csk;
 451 }
 452
 453 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 454                                       __be32 saddr, __be32 daddr,
 455                                       __be16 sport, __be16 dport, u8 tos)
 456 {
 457         struct rtable *rt;
 458
 459         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 460                                    dport, sport, IPPROTO_TCP, tos, 0);
 461         if (IS_ERR(rt))
 462                 return NULL;
 463
 464         return rt;
 465 }
 466
 467 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 468 {
 469         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 470         struct dst_entry *dst;
 471         struct net_device *ndev;
 472         struct cxgbi_device *cdev;
 473         struct rtable *rt = NULL;
 474         struct flowi4 fl4;
 475         struct cxgbi_sock *csk = NULL;
 476         unsigned int mtu = 0;
 477         int port = 0xFFFF;
 478         int err = 0;
 479
 480         if (daddr->sin_family != AF_INET) {
 481                 pr_info("address family 0x%x NOT supported.\n",
 482                         daddr->sin_family);
 483                 err = -EAFNOSUPPORT;
 484                 goto err_out;
 485         }
 486
 487         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 488         if (!rt) {
 489                 pr_info("no route to ipv4 0x%x, port %u.\n",
 490                         daddr->sin_addr.s_addr, daddr->sin_port);
 491                 err = -ENETUNREACH;
 492                 goto err_out;
 493         }
 494         dst = &rt->dst;
 495         ndev = dst_get_neighbour(dst)->dev;
 496
 497         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 498                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 499                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 500                         ndev->name);
 501                 err = -ENETUNREACH;
 502                 goto rel_rt;
 503         }
 504
 505         if (ndev->flags & IFF_LOOPBACK) {
 506                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 507                 mtu = ndev->mtu;
 508                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 509                         dst_get_neighbour(dst)->dev->name, ndev->name, mtu);
 510         }
 511
 512         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 513         if (!cdev) {
 514                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 515                         &daddr->sin_addr.s_addr, ndev->name);
 516                 err = -ENETUNREACH;
 517                 goto rel_rt;
 518         }
 519         log_debug(1 << CXGBI_DBG_SOCK,
 520                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 521                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 522                            port, ndev->name, cdev);
 523
 524         csk = cxgbi_sock_create(cdev);
 525         if (!csk) {
 526                 err = -ENOMEM;
 527                 goto rel_rt;
 528         }
 529         csk->cdev = cdev;
 530         csk->port_id = port;
 531         csk->mtu = mtu;
 532         csk->dst = dst;
 533         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 534         csk->daddr.sin_port = daddr->sin_port;
 535         csk->daddr.sin_family = daddr->sin_family;
 536         csk->saddr.sin_addr.s_addr = fl4.saddr;
 537
 538         return csk;
 539
 540 rel_rt:
 541         ip_rt_put(rt);
 542         if (csk)
 543                 cxgbi_sock_closed(csk);
 544 err_out:
 545         return ERR_PTR(err);
 546 }
 547
 548 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 549                         unsigned int opt)
 550 {
 551         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 552         dst_confirm(csk->dst);
 553         smp_mb();
 554         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 555 }
 556 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 557
 558 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 559 {
 560         log_debug(1 << CXGBI_DBG_SOCK,
 561                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 562                 csk, csk->state, csk->flags, csk->user_data);
 563
 564         if (csk->state != CTP_ESTABLISHED) {
 565                 read_lock_bh(&csk->callback_lock);
 566                 if (csk->user_data)
 567                         iscsi_conn_failure(csk->user_data,
 568                                         ISCSI_ERR_CONN_FAILED);
 569                 read_unlock_bh(&csk->callback_lock);
 570         }
 571 }
 572
 573 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 574 {
 575         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 576                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 577         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 578         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 579                 return;
 580         if (csk->saddr.sin_port)
 581                 sock_put_port(csk);
 582         if (csk->dst)
 583                 dst_release(csk->dst);
 584         csk->cdev->csk_release_offload_resources(csk);
 585         cxgbi_sock_set_state(csk, CTP_CLOSED);
 586         cxgbi_inform_iscsi_conn_closing(csk);
 587         cxgbi_sock_put(csk);
 588 }
 589 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 590
 591 static void need_active_close(struct cxgbi_sock *csk)
 592 {
 593         int data_lost;
 594         int close_req = 0;
 595
 596         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 597                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 598         spin_lock_bh(&csk->lock);
 599         dst_confirm(csk->dst);
 600         data_lost = skb_queue_len(&csk->receive_queue);
 601         __skb_queue_purge(&csk->receive_queue);
 602
 603         if (csk->state == CTP_ACTIVE_OPEN)
 604                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 605         else if (csk->state == CTP_ESTABLISHED) {
 606                 close_req = 1;
 607                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 608         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 609                 close_req = 1;
 610                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 611         }
 612
 613         if (close_req) {
 614                 if (data_lost)
 615                         csk->cdev->csk_send_abort_req(csk);
 616                 else
 617                         csk->cdev->csk_send_close_req(csk);
 618         }
 619
 620         spin_unlock_bh(&csk->lock);
 621 }
 622
 623 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 624 {
 625         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 626                         csk, csk->state, csk->flags,
 627                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 628                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 629                         errno);
 630
 631         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 632         csk->err = errno;
 633         cxgbi_sock_closed(csk);
 634 }
 635 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 636
 637 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 638 {
 639         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 640
 641         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 642                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 643         cxgbi_sock_get(csk);
 644         spin_lock_bh(&csk->lock);
 645         if (csk->state == CTP_ACTIVE_OPEN)
 646                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 647         spin_unlock_bh(&csk->lock);
 648         cxgbi_sock_put(csk);
 649         __kfree_skb(skb);
 650 }
 651 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 652
 653 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 654 {
 655         cxgbi_sock_get(csk);
 656         spin_lock_bh(&csk->lock);
 657         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 658                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 659                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 660                 else {
 661                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 662                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 663                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 664                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 665                                         csk, csk->state, csk->flags, csk->tid);
 666                         cxgbi_sock_closed(csk);
 667                 }
 668         }
 669         spin_unlock_bh(&csk->lock);
 670         cxgbi_sock_put(csk);
 671 }
 672 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 673
 674 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 675 {
 676         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 677                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 678         cxgbi_sock_get(csk);
 679         spin_lock_bh(&csk->lock);
 680
 681         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 682                 goto done;
 683
 684         switch (csk->state) {
 685         case CTP_ESTABLISHED:
 686                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 687                 break;
 688         case CTP_ACTIVE_CLOSE:
 689                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 690                 break;
 691         case CTP_CLOSE_WAIT_1:
 692                 cxgbi_sock_closed(csk);
 693                 break;
 694         case CTP_ABORTING:
 695                 break;
 696         default:
 697                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 698                         csk, csk->state, csk->flags, csk->tid);
 699         }
 700         cxgbi_inform_iscsi_conn_closing(csk);
 701 done:
 702         spin_unlock_bh(&csk->lock);
 703         cxgbi_sock_put(csk);
 704 }
 705 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 706
 707 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 708 {
 709         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 710                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 711         cxgbi_sock_get(csk);
 712         spin_lock_bh(&csk->lock);
 713
 714         csk->snd_una = snd_nxt - 1;
 715         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 716                 goto done;
 717
 718         switch (csk->state) {
 719         case CTP_ACTIVE_CLOSE:
 720                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 721                 break;
 722         case CTP_CLOSE_WAIT_1:
 723         case CTP_CLOSE_WAIT_2:
 724                 cxgbi_sock_closed(csk);
 725                 break;
 726         case CTP_ABORTING:
 727                 break;
 728         default:
 729                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 730                         csk, csk->state, csk->flags, csk->tid);
 731         }
 732 done:
 733         spin_unlock_bh(&csk->lock);
 734         cxgbi_sock_put(csk);
 735 }
 736 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 737
 738 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 739                            unsigned int snd_una, int seq_chk)
 740 {
 741         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 742                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 743                         csk, csk->state, csk->flags, csk->tid, credits,
 744                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 745
 746         spin_lock_bh(&csk->lock);
 747
 748         csk->wr_cred += credits;
 749         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 750                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 751
 752         while (credits) {
 753                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 754
 755                 if (unlikely(!p)) {
 756                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 757                                 csk, csk->state, csk->flags, csk->tid, credits,
 758                                 csk->wr_cred, csk->wr_una_cred);
 759                         break;
 760                 }
 761
 762                 if (unlikely(credits < p->csum)) {
 763                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 764                                 csk, csk->state, csk->flags, csk->tid,
 765                                 credits, csk->wr_cred, csk->wr_una_cred,
 766                                 p->csum);
 767                         p->csum -= credits;
 768                         break;
 769                 } else {
 770                         cxgbi_sock_dequeue_wr(csk);
 771                         credits -= p->csum;
 772                         kfree_skb(p);
 773                 }
 774         }
 775
 776         cxgbi_sock_check_wr_invariants(csk);
 777
 778         if (seq_chk) {
 779                 if (unlikely(before(snd_una, csk->snd_una))) {
 780                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
 781                                 csk, csk->state, csk->flags, csk->tid, snd_una,
 782                                 csk->snd_una);
 783                         goto done;
 784                 }
 785
 786                 if (csk->snd_una != snd_una) {
 787                         csk->snd_una = snd_una;
 788                         dst_confirm(csk->dst);
 789                 }
 790         }
 791
 792         if (skb_queue_len(&csk->write_queue)) {
 793                 if (csk->cdev->csk_push_tx_frames(csk, 0))
 794                         cxgbi_conn_tx_open(csk);
 795         } else
 796                 cxgbi_conn_tx_open(csk);
 797 done:
 798         spin_unlock_bh(&csk->lock);
 799 }
 800 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
 801
 802 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
 803                                              unsigned short mtu)
 804 {
 805         int i = 0;
 806
 807         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
 808                 ++i;
 809
 810         return i;
 811 }
 812
 813 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
 814 {
 815         unsigned int idx;
 816         struct dst_entry *dst = csk->dst;
 817
 818         csk->advmss = dst_metric_advmss(dst);
 819
 820         if (csk->advmss > pmtu - 40)
 821                 csk->advmss = pmtu - 40;
 822         if (csk->advmss < csk->cdev->mtus[0] - 40)
 823                 csk->advmss = csk->cdev->mtus[0] - 40;
 824         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
 825
 826         return idx;
 827 }
 828 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
 829
 830 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
 831 {
 832         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
 833         __skb_queue_tail(&csk->write_queue, skb);
 834 }
 835 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
 836
 837 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
 838 {
 839         struct sk_buff *skb;
 840
 841         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
 842                 kfree_skb(skb);
 843 }
 844 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
 845
 846 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
 847 {
 848         int pending = cxgbi_sock_count_pending_wrs(csk);
 849
 850         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
 851                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
 852                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
 853 }
 854 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
 855
 856 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
 857 {
 858         struct cxgbi_device *cdev = csk->cdev;
 859         struct sk_buff *next;
 860         int err, copied = 0;
 861
 862         spin_lock_bh(&csk->lock);
 863
 864         if (csk->state != CTP_ESTABLISHED) {
 865                 log_debug(1 << CXGBI_DBG_PDU_TX,
 866                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
 867                         csk, csk->state, csk->flags, csk->tid);
 868                 err = -EAGAIN;
 869                 goto out_err;
 870         }
 871
 872         if (csk->err) {
 873                 log_debug(1 << CXGBI_DBG_PDU_TX,
 874                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
 875                         csk, csk->state, csk->flags, csk->tid, csk->err);
 876                 err = -EPIPE;
 877                 goto out_err;
 878         }
 879
 880         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
 881                 log_debug(1 << CXGBI_DBG_PDU_TX,
 882                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
 883                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
 884                         csk->snd_una, cdev->snd_win);
 885                 err = -ENOBUFS;
 886                 goto out_err;
 887         }
 888
 889         while (skb) {
 890                 int frags = skb_shinfo(skb)->nr_frags +
 891                                 (skb->len != skb->data_len);
 892
 893                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
 894                         pr_err("csk 0x%p, skb head %u < %u.\n",
 895                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
 896                         err = -EINVAL;
 897                         goto out_err;
 898                 }
 899
 900                 if (frags >= SKB_WR_LIST_SIZE) {
 901                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
 902                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
 903                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
 904                         err = -EINVAL;
 905                         goto out_err;
 906                 }
 907
 908                 next = skb->next;
 909                 skb->next = NULL;
 910                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
 911                 cxgbi_sock_skb_entail(csk, skb);
 912                 copied += skb->len;
 913                 csk->write_seq += skb->len +
 914                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 915                 skb = next;
 916         }
 917 done:
 918         if (likely(skb_queue_len(&csk->write_queue)))
 919                 cdev->csk_push_tx_frames(csk, 1);
 920         spin_unlock_bh(&csk->lock);
 921         return copied;
 922
 923 out_err:
 924         if (copied == 0 && err == -EPIPE)
 925                 copied = csk->err ? csk->err : -EPIPE;
 926         else
 927                 copied = err;
 928         goto done;
 929 }
 930
 931 /*
 932  * Direct Data Placement -
 933  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
 934  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
 935  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
 936  * The host memory address is programmed into h/w in the format of pagepod
 937  * entries.
 938  * The location of the pagepod entry is encoded into ddp tag which is used as
 939  * the base for ITT/TTT.
 940  */
 941
 942 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
 943 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
 944 static unsigned char page_idx = DDP_PGIDX_MAX;
 945
 946 static unsigned char sw_tag_idx_bits;
 947 static unsigned char sw_tag_age_bits;
 948
 949 /*
 950  * Direct-Data Placement page size adjustment
 951  */
 952 static int ddp_adjust_page_table(void)
 953 {
 954         int i;
 955         unsigned int base_order, order;
 956
 957         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
 958                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
 959                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
 960                 return -EINVAL;
 961         }
 962
 963         base_order = get_order(1UL << ddp_page_shift[0]);
 964         order = get_order(1UL << PAGE_SHIFT);
 965
 966         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 967                 /* first is the kernel page size, then just doubling */
 968                 ddp_page_order[i] = order - base_order + i;
 969                 ddp_page_shift[i] = PAGE_SHIFT + i;
 970         }
 971         return 0;
 972 }
 973
 974 static int ddp_find_page_index(unsigned long pgsz)
 975 {
 976         int i;
 977
 978         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 979                 if (pgsz == (1UL << ddp_page_shift[i]))
 980                         return i;
 981         }
 982         pr_info("ddp page size %lu not supported.\n", pgsz);
 983         return DDP_PGIDX_MAX;
 984 }
 985
 986 static void ddp_setup_host_page_size(void)
 987 {
 988         if (page_idx == DDP_PGIDX_MAX) {
 989                 page_idx = ddp_find_page_index(PAGE_SIZE);
 990
 991                 if (page_idx == DDP_PGIDX_MAX) {
 992                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
 993                         if (ddp_adjust_page_table() < 0) {
 994                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
 995                                 return;
 996                         }
 997                         page_idx = ddp_find_page_index(PAGE_SIZE);
 998                 }
 999                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1000         }
1001 }
1002
1003 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1004 {
1005         int i;
1006
1007         for (i = 0; i < DDP_PGIDX_MAX; i++)
1008                 pgsz_factor[i] = ddp_page_order[i];
1009 }
1010 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1011
1012 /*
1013  * DDP setup & teardown
1014  */
1015
1016 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1017                         struct cxgbi_pagepod_hdr *hdr,
1018                         struct cxgbi_gather_list *gl, unsigned int gidx)
1019 {
1020         int i;
1021
1022         memcpy(ppod, hdr, sizeof(*hdr));
1023         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1024                 ppod->addr[i] = gidx < gl->nelem ?
1025                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1026         }
1027 }
1028 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1029
1030 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1031 {
1032         memset(ppod, 0, sizeof(*ppod));
1033 }
1034 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1035
1036 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1037                                         unsigned int start, unsigned int max,
1038                                         unsigned int count,
1039                                         struct cxgbi_gather_list *gl)
1040 {
1041         unsigned int i, j, k;
1042
1043         /*  not enough entries */
1044         if ((max - start) < count) {
1045                 log_debug(1 << CXGBI_DBG_DDP,
1046                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1047                 return -EBUSY;
1048         }
1049
1050         max -= count;
1051         spin_lock(&ddp->map_lock);
1052         for (i = start; i < max;) {
1053                 for (j = 0, k = i; j < count; j++, k++) {
1054                         if (ddp->gl_map[k])
1055                                 break;
1056                 }
1057                 if (j == count) {
1058                         for (j = 0, k = i; j < count; j++, k++)
1059                                 ddp->gl_map[k] = gl;
1060                         spin_unlock(&ddp->map_lock);
1061                         return i;
1062                 }
1063                 i += j + 1;
1064         }
1065         spin_unlock(&ddp->map_lock);
1066         log_debug(1 << CXGBI_DBG_DDP,
1067                 "NO suitable entries %u available.\n", count);
1068         return -EBUSY;
1069 }
1070
1071 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1072                                                 int start, int count)
1073 {
1074         spin_lock(&ddp->map_lock);
1075         memset(&ddp->gl_map[start], 0,
1076                 count * sizeof(struct cxgbi_gather_list *));
1077         spin_unlock(&ddp->map_lock);
1078 }
1079
1080 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1081                                         struct cxgbi_gather_list *gl)
1082 {
1083         int i;
1084
1085         for (i = 0; i < gl->nelem; i++)
1086                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1087                                 PCI_DMA_FROMDEVICE);
1088 }
1089
1090 static inline int ddp_gl_map(struct pci_dev *pdev,
1091                                     struct cxgbi_gather_list *gl)
1092 {
1093         int i;
1094
1095         for (i = 0; i < gl->nelem; i++) {
1096                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1097                                                 PAGE_SIZE,
1098                                                 PCI_DMA_FROMDEVICE);
1099                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1100                         log_debug(1 << CXGBI_DBG_DDP,
1101                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1102                                 i, gl->pages[i], pdev);
1103                         goto unmap;
1104                 }
1105         }
1106         return i;
1107 unmap:
1108         if (i) {
1109                 unsigned int nelem = gl->nelem;
1110
1111                 gl->nelem = i;
1112                 ddp_gl_unmap(pdev, gl);
1113                 gl->nelem = nelem;
1114         }
1115         return -EINVAL;
1116 }
1117
1118 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1119                                   struct pci_dev *pdev)
1120 {
1121         ddp_gl_unmap(pdev, gl);
1122         kfree(gl);
1123 }
1124
1125 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1126                                                     struct scatterlist *sgl,
1127                                                     unsigned int sgcnt,
1128                                                     struct pci_dev *pdev,
1129                                                     gfp_t gfp)
1130 {
1131         struct cxgbi_gather_list *gl;
1132         struct scatterlist *sg = sgl;
1133         struct page *sgpage = sg_page(sg);
1134         unsigned int sglen = sg->length;
1135         unsigned int sgoffset = sg->offset;
1136         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1137                                 PAGE_SHIFT;
1138         int i = 1, j = 0;
1139
1140         if (xferlen < DDP_THRESHOLD) {
1141                 log_debug(1 << CXGBI_DBG_DDP,
1142                         "xfer %u < threshold %u, no ddp.\n",
1143                         xferlen, DDP_THRESHOLD);
1144                 return NULL;
1145         }
1146
1147         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1148                      npages * (sizeof(dma_addr_t) +
1149                      sizeof(struct page *)), gfp);
1150         if (!gl) {
1151                 log_debug(1 << CXGBI_DBG_DDP,
1152                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1153                 return NULL;
1154         }
1155
1156          log_debug(1 << CXGBI_DBG_DDP,
1157                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1158
1159         gl->pages = (struct page **)&gl->phys_addr[npages];
1160         gl->nelem = npages;
1161         gl->length = xferlen;
1162         gl->offset = sgoffset;
1163         gl->pages[0] = sgpage;
1164
1165         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1166                 i++, sg = sg_next(sg)) {
1167                 struct page *page = sg_page(sg);
1168
1169                 if (sgpage == page && sg->offset == sgoffset + sglen)
1170                         sglen += sg->length;
1171                 else {
1172                         /*  make sure the sgl is fit for ddp:
1173                          *  each has the same page size, and
1174                          *  all of the middle pages are used completely
1175                          */
1176                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1177                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1178                                 log_debug(1 << CXGBI_DBG_DDP,
1179                                         "page %d/%u, %u + %u.\n",
1180                                         i, sgcnt, sgoffset, sglen);
1181                                 goto error_out;
1182                         }
1183
1184                         j++;
1185                         if (j == gl->nelem || sg->offset) {
1186                                 log_debug(1 << CXGBI_DBG_DDP,
1187                                         "page %d/%u, offset %u.\n",
1188                                         j, gl->nelem, sg->offset);
1189                                 goto error_out;
1190                         }
1191                         gl->pages[j] = page;
1192                         sglen = sg->length;
1193                         sgoffset = sg->offset;
1194                         sgpage = page;
1195                 }
1196         }
1197         gl->nelem = ++j;
1198
1199         if (ddp_gl_map(pdev, gl) < 0)
1200                 goto error_out;
1201
1202         return gl;
1203
1204 error_out:
1205         kfree(gl);
1206         return NULL;
1207 }
1208
1209 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1210 {
1211         struct cxgbi_device *cdev = chba->cdev;
1212         struct cxgbi_ddp_info *ddp = cdev->ddp;
1213         u32 idx;
1214
1215         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1216         if (idx < ddp->nppods) {
1217                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1218                 unsigned int npods;
1219
1220                 if (!gl || !gl->nelem) {
1221                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1222                                 tag, idx, gl, gl ? gl->nelem : 0);
1223                         return;
1224                 }
1225                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1226                 log_debug(1 << CXGBI_DBG_DDP,
1227                         "tag 0x%x, release idx %u, npods %u.\n",
1228                         tag, idx, npods);
1229                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1230                 ddp_unmark_entries(ddp, idx, npods);
1231                 ddp_release_gl(gl, ddp->pdev);
1232         } else
1233                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1234 }
1235
1236 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1237                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1238                            gfp_t gfp)
1239 {
1240         struct cxgbi_device *cdev = csk->cdev;
1241         struct cxgbi_ddp_info *ddp = cdev->ddp;
1242         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1243         struct cxgbi_pagepod_hdr hdr;
1244         unsigned int npods;
1245         int idx = -1;
1246         int err = -ENOMEM;
1247         u32 tag;
1248
1249         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1250         if (ddp->idx_last == ddp->nppods)
1251                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1252                                                         npods, gl);
1253         else {
1254                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1255                                                         ddp->nppods, npods,
1256                                                         gl);
1257                 if (idx < 0 && ddp->idx_last >= npods) {
1258                         idx = ddp_find_unused_entries(ddp, 0,
1259                                 min(ddp->idx_last + npods, ddp->nppods),
1260                                                         npods, gl);
1261                 }
1262         }
1263         if (idx < 0) {
1264                 log_debug(1 << CXGBI_DBG_DDP,
1265                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1266                         gl->length, gl->nelem, npods);
1267                 return idx;
1268         }
1269
1270         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1271         tag |= idx << PPOD_IDX_SHIFT;
1272
1273         hdr.rsvd = 0;
1274         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1275         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1276         hdr.max_offset = htonl(gl->length);
1277         hdr.page_offset = htonl(gl->offset);
1278
1279         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1280         if (err < 0)
1281                 goto unmark_entries;
1282
1283         ddp->idx_last = idx;
1284         log_debug(1 << CXGBI_DBG_DDP,
1285                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1286                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1287                 npods);
1288         *tagp = tag;
1289         return 0;
1290
1291 unmark_entries:
1292         ddp_unmark_entries(ddp, idx, npods);
1293         return err;
1294 }
1295
1296 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1297                         unsigned int sw_tag, unsigned int xferlen,
1298                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1299 {
1300         struct cxgbi_device *cdev = csk->cdev;
1301         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1302         struct cxgbi_gather_list *gl;
1303         int err;
1304
1305         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1306             xferlen < DDP_THRESHOLD) {
1307                 log_debug(1 << CXGBI_DBG_DDP,
1308                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1309                 return -EINVAL;
1310         }
1311
1312         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1313                 log_debug(1 << CXGBI_DBG_DDP,
1314                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1315                 return -EINVAL;
1316         }
1317
1318         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1319         if (!gl)
1320                 return -ENOMEM;
1321
1322         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1323         if (err < 0)
1324                 ddp_release_gl(gl, cdev->pdev);
1325
1326         return err;
1327 }
1328
1329 static void ddp_destroy(struct kref *kref)
1330 {
1331         struct cxgbi_ddp_info *ddp = container_of(kref,
1332                                                 struct cxgbi_ddp_info,
1333                                                 refcnt);
1334         struct cxgbi_device *cdev = ddp->cdev;
1335         int i = 0;
1336
1337         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1338
1339         while (i < ddp->nppods) {
1340                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1341
1342                 if (gl) {
1343                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1344                                         >> PPOD_PAGES_SHIFT;
1345                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1346                         kfree(gl);
1347                         i += npods;
1348                 } else
1349                         i++;
1350         }
1351         cxgbi_free_big_mem(ddp);
1352 }
1353
1354 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1355 {
1356         struct cxgbi_ddp_info *ddp = cdev->ddp;
1357
1358         log_debug(1 << CXGBI_DBG_DDP,
1359                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1360         cdev->ddp = NULL;
1361         if (ddp)
1362                 return kref_put(&ddp->refcnt, ddp_destroy);
1363         return 0;
1364 }
1365 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1366
1367 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1368                    unsigned int llimit, unsigned int ulimit,
1369                    unsigned int max_txsz, unsigned int max_rxsz)
1370 {
1371         struct cxgbi_ddp_info *ddp;
1372         unsigned int ppmax, bits;
1373
1374         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1375         bits = __ilog2_u32(ppmax) + 1;
1376         if (bits > PPOD_IDX_MAX_SIZE)
1377                 bits = PPOD_IDX_MAX_SIZE;
1378         ppmax = (1 << (bits - 1)) - 1;
1379
1380         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1381                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1382                                          sizeof(struct sk_buff *)),
1383                                 GFP_KERNEL);
1384         if (!ddp) {
1385                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1386                 return -ENOMEM;
1387         }
1388         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1389         cdev->ddp = ddp;
1390
1391         spin_lock_init(&ddp->map_lock);
1392         kref_init(&ddp->refcnt);
1393
1394         ddp->cdev = cdev;
1395         ddp->pdev = cdev->pdev;
1396         ddp->llimit = llimit;
1397         ddp->ulimit = ulimit;
1398         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1399         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1400         ddp->nppods = ppmax;
1401         ddp->idx_last = ppmax;
1402         ddp->idx_bits = bits;
1403         ddp->idx_mask = (1 << bits) - 1;
1404         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1405
1406         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1407         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1408         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1409         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1410
1411         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1412                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1413                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1414                 cdev->tag_format.rsvd_mask);
1415
1416         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1417                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1418         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1419                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1420
1421         log_debug(1 << CXGBI_DBG_DDP,
1422                 "%s max payload size: %u/%u, %u/%u.\n",
1423                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1424                 cdev->rx_max_size, ddp->max_rxsz);
1425         return 0;
1426 }
1427 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1428
1429 /*
1430  * APIs interacting with open-iscsi libraries
1431  */
1432
1433 static unsigned char padding[4];
1434
1435 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1436 {
1437         struct scsi_cmnd *sc = task->sc;
1438         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1439         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1440         struct cxgbi_hba *chba = cconn->chba;
1441         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1442         u32 tag = ntohl((__force u32)hdr_itt);
1443
1444         log_debug(1 << CXGBI_DBG_DDP,
1445                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1446         if (sc &&
1447             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1448             cxgbi_is_ddp_tag(tformat, tag))
1449                 ddp_tag_release(chba, tag);
1450 }
1451
1452 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1453 {
1454         struct scsi_cmnd *sc = task->sc;
1455         struct iscsi_conn *conn = task->conn;
1456         struct iscsi_session *sess = conn->session;
1457         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1458         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1459         struct cxgbi_hba *chba = cconn->chba;
1460         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1461         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1462         u32 tag = 0;
1463         int err = -EINVAL;
1464
1465         if (sc &&
1466             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1467                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1468                                         scsi_in(sc)->length,
1469                                         scsi_in(sc)->table.sgl,
1470                                         scsi_in(sc)->table.nents,
1471                                         GFP_ATOMIC);
1472                 if (err < 0)
1473                         log_debug(1 << CXGBI_DBG_DDP,
1474                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1475                                 cconn->cep->csk, task, scsi_in(sc)->length,
1476                                 scsi_in(sc)->table.nents);
1477         }
1478
1479         if (err < 0)
1480                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1481         /*  the itt need to sent in big-endian order */
1482         *hdr_itt = (__force itt_t)htonl(tag);
1483
1484         log_debug(1 << CXGBI_DBG_DDP,
1485                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1486                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1487         return 0;
1488 }
1489
1490 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1491 {
1492         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1493         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1494         struct cxgbi_device *cdev = cconn->chba->cdev;
1495         u32 tag = ntohl((__force u32) itt);
1496         u32 sw_bits;
1497
1498         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1499         if (idx)
1500                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1501         if (age)
1502                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1503
1504         log_debug(1 << CXGBI_DBG_DDP,
1505                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1506                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1507                 age ? *age : 0xFF);
1508 }
1509 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1510
1511 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1512 {
1513         struct iscsi_conn *conn = csk->user_data;
1514
1515         if (conn) {
1516                 log_debug(1 << CXGBI_DBG_SOCK,
1517                         "csk 0x%p, cid %d.\n", csk, conn->id);
1518                 iscsi_conn_queue_work(conn);
1519         }
1520 }
1521 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1522
1523 /*
1524  * pdu receive, interact with libiscsi_tcp
1525  */
1526 static inline int read_pdu_skb(struct iscsi_conn *conn,
1527                                struct sk_buff *skb,
1528                                unsigned int offset,
1529                                int offloaded)
1530 {
1531         int status = 0;
1532         int bytes_read;
1533
1534         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1535         switch (status) {
1536         case ISCSI_TCP_CONN_ERR:
1537                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1538                           skb, offset, offloaded);
1539                 return -EIO;
1540         case ISCSI_TCP_SUSPENDED:
1541                 log_debug(1 << CXGBI_DBG_PDU_RX,
1542                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1543                         skb, offset, offloaded, bytes_read);
1544                 /* no transfer - just have caller flush queue */
1545                 return bytes_read;
1546         case ISCSI_TCP_SKB_DONE:
1547                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1548                         skb, offset, offloaded);
1549                 /*
1550                  * pdus should always fit in the skb and we should get
1551                  * segment done notifcation.
1552                  */
1553                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1554                 return -EFAULT;
1555         case ISCSI_TCP_SEGMENT_DONE:
1556                 log_debug(1 << CXGBI_DBG_PDU_RX,
1557                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1558                         skb, offset, offloaded, bytes_read);
1559                 return bytes_read;
1560         default:
1561                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1562                         skb, offset, offloaded, status);
1563                 return -EINVAL;
1564         }
1565 }
1566
1567 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1568 {
1569         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1570
1571         log_debug(1 << CXGBI_DBG_PDU_RX,
1572                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1573                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1574
1575         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1576                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1577                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1578                 return -EIO;
1579         }
1580
1581         if (conn->hdrdgst_en &&
1582             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1583                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1584                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1585                 return -EIO;
1586         }
1587
1588         return read_pdu_skb(conn, skb, 0, 0);
1589 }
1590
1591 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1592                              struct sk_buff *skb, unsigned int offset)
1593 {
1594         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1595         bool offloaded = 0;
1596         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1597
1598         log_debug(1 << CXGBI_DBG_PDU_RX,
1599                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1600                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1601
1602         if (conn->datadgst_en &&
1603             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1604                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1605                         conn, lskb, cxgbi_skcb_flags(lskb));
1606                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1607                 return -EIO;
1608         }
1609
1610         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1611                 return 0;
1612
1613         /* coalesced, add header digest length */
1614         if (lskb == skb && conn->hdrdgst_en)
1615                 offset += ISCSI_DIGEST_SIZE;
1616
1617         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1618                 offloaded = 1;
1619
1620         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1621                 log_debug(1 << CXGBI_DBG_PDU_RX,
1622                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1623                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1624                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1625
1626         return read_pdu_skb(conn, skb, offset, offloaded);
1627 }
1628
1629 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1630 {
1631         struct cxgbi_device *cdev = csk->cdev;
1632         int must_send;
1633         u32 credits;
1634
1635         log_debug(1 << CXGBI_DBG_PDU_RX,
1636                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1637                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1638                 csk->rcv_wup, cdev->rx_credit_thres,
1639                 cdev->rcv_win);
1640
1641         if (csk->state != CTP_ESTABLISHED)
1642                 return;
1643
1644         credits = csk->copied_seq - csk->rcv_wup;
1645         if (unlikely(!credits))
1646                 return;
1647         if (unlikely(cdev->rx_credit_thres == 0))
1648                 return;
1649
1650         must_send = credits + 16384 >= cdev->rcv_win;
1651         if (must_send || credits >= cdev->rx_credit_thres)
1652                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1653 }
1654
1655 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1656 {
1657         struct cxgbi_device *cdev = csk->cdev;
1658         struct iscsi_conn *conn = csk->user_data;
1659         struct sk_buff *skb;
1660         unsigned int read = 0;
1661         int err = 0;
1662
1663         log_debug(1 << CXGBI_DBG_PDU_RX,
1664                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1665
1666         if (unlikely(!conn || conn->suspend_rx)) {
1667                 log_debug(1 << CXGBI_DBG_PDU_RX,
1668                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1669                         csk, conn, conn ? conn->id : 0xFF,
1670                         conn ? conn->suspend_rx : 0xFF);
1671                 return;
1672         }
1673
1674         while (!err) {
1675                 skb = skb_peek(&csk->receive_queue);
1676                 if (!skb ||
1677                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1678                         if (skb)
1679                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1680                                         "skb 0x%p, NOT ready 0x%lx.\n",
1681                                         skb, cxgbi_skcb_flags(skb));
1682                         break;
1683                 }
1684                 __skb_unlink(skb, &csk->receive_queue);
1685
1686                 read += cxgbi_skcb_rx_pdulen(skb);
1687                 log_debug(1 << CXGBI_DBG_PDU_RX,
1688                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1689                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1690                         cxgbi_skcb_rx_pdulen(skb));
1691
1692                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1693                         err = skb_read_pdu_bhs(conn, skb);
1694                         if (err < 0) {
1695                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1696                                         "f 0x%lx, plen %u.\n",
1697                                         csk, skb, skb->len,
1698                                         cxgbi_skcb_flags(skb),
1699                                         cxgbi_skcb_rx_pdulen(skb));
1700                                 goto skb_done;
1701                         }
1702                         err = skb_read_pdu_data(conn, skb, skb,
1703                                                 err + cdev->skb_rx_extra);
1704                         if (err < 0)
1705                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1706                                         "f 0x%lx, plen %u.\n",
1707                                         csk, skb, skb->len,
1708                                         cxgbi_skcb_flags(skb),
1709                                         cxgbi_skcb_rx_pdulen(skb));
1710                 } else {
1711                         err = skb_read_pdu_bhs(conn, skb);
1712                         if (err < 0) {
1713                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1714                                         "f 0x%lx, plen %u.\n",
1715                                         csk, skb, skb->len,
1716                                         cxgbi_skcb_flags(skb),
1717                                         cxgbi_skcb_rx_pdulen(skb));
1718                                 goto skb_done;
1719                         }
1720
1721                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1722                                 struct sk_buff *dskb;
1723
1724                                 dskb = skb_peek(&csk->receive_queue);
1725                                 if (!dskb) {
1726                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1727                                                 " plen %u, NO data.\n",
1728                                                 csk, skb, skb->len,
1729                                                 cxgbi_skcb_flags(skb),
1730                                                 cxgbi_skcb_rx_pdulen(skb));
1731                                         err = -EIO;
1732                                         goto skb_done;
1733                                 }
1734                                 __skb_unlink(dskb, &csk->receive_queue);
1735
1736                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1737                                 if (err < 0)
1738                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1739                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1740                                                 "%u.\n",
1741                                                 csk, skb, skb->len,
1742                                                 cxgbi_skcb_flags(skb),
1743                                                 cxgbi_skcb_rx_pdulen(skb),
1744                                                 dskb, dskb->len);
1745                                 __kfree_skb(dskb);
1746                         } else
1747                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1748                 }
1749 skb_done:
1750                 __kfree_skb(skb);
1751
1752                 if (err < 0)
1753                         break;
1754         }
1755
1756         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1757         if (read) {
1758                 csk->copied_seq += read;
1759                 csk_return_rx_credits(csk, read);
1760                 conn->rxdata_octets += read;
1761         }
1762
1763         if (err < 0) {
1764                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1765                         csk, conn, err, read);
1766                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1767         }
1768 }
1769 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1770
1771 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1772                                 unsigned int offset, unsigned int *off,
1773                                 struct scatterlist **sgp)
1774 {
1775         int i;
1776         struct scatterlist *sg;
1777
1778         for_each_sg(sgl, sg, sgcnt, i) {
1779                 if (offset < sg->length) {
1780                         *off = offset;
1781                         *sgp = sg;
1782                         return 0;
1783                 }
1784                 offset -= sg->length;
1785         }
1786         return -EFAULT;
1787 }
1788
1789 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1790                                 unsigned int dlen, skb_frag_t *frags,
1791                                 int frag_max)
1792 {
1793         unsigned int datalen = dlen;
1794         unsigned int sglen = sg->length - sgoffset;
1795         struct page *page = sg_page(sg);
1796         int i;
1797
1798         i = 0;
1799         do {
1800                 unsigned int copy;
1801
1802                 if (!sglen) {
1803                         sg = sg_next(sg);
1804                         if (!sg) {
1805                                 pr_warn("sg %d NULL, len %u/%u.\n",
1806                                         i, datalen, dlen);
1807                                 return -EINVAL;
1808                         }
1809                         sgoffset = 0;
1810                         sglen = sg->length;
1811                         page = sg_page(sg);
1812
1813                 }
1814                 copy = min(datalen, sglen);
1815                 if (i && page == frags[i - 1].page &&
1816                     sgoffset + sg->offset ==
1817                         frags[i - 1].page_offset + skb_frag_size(&frags[i - 1])) {
1818                         skb_frag_size_add(&frags[i - 1], copy);
1819                 } else {
1820                         if (i >= frag_max) {
1821                                 pr_warn("too many pages %u, dlen %u.\n",
1822                                         frag_max, dlen);
1823                                 return -EINVAL;
1824                         }
1825
1826                         frags[i].page = page;
1827                         frags[i].page_offset = sg->offset + sgoffset;
1828                         skb_frag_size_set(&frags[i], copy);
1829                         i++;
1830                 }
1831                 datalen -= copy;
1832                 sgoffset += copy;
1833                 sglen -= copy;
1834         } while (datalen);
1835
1836         return i;
1837 }
1838
1839 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1840 {
1841         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1842         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1843         struct cxgbi_device *cdev = cconn->chba->cdev;
1844         struct iscsi_conn *conn = task->conn;
1845         struct iscsi_tcp_task *tcp_task = task->dd_data;
1846         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1847         struct scsi_cmnd *sc = task->sc;
1848         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1849
1850         tcp_task->dd_data = tdata;
1851         task->hdr = NULL;
1852
1853         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1854             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1855              (opcode == ISCSI_OP_SCSI_CMD &&
1856               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1857                 /* data could goes into skb head */
1858                 headroom += min_t(unsigned int,
1859                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1860                                 conn->max_xmit_dlength);
1861
1862         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1863         if (!tdata->skb) {
1864                 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1865                         cdev->skb_tx_rsvd, headroom, opcode);
1866                 return -ENOMEM;
1867         }
1868
1869         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1870         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1871         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1872
1873         /* data_out uses scsi_cmd's itt */
1874         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1875                 task_reserve_itt(task, &task->hdr->itt);
1876
1877         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1879                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1880                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1881
1882         return 0;
1883 }
1884 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1885
1886 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1887 {
1888         if (hcrc || dcrc) {
1889                 u8 submode = 0;
1890
1891                 if (hcrc)
1892                         submode |= 1;
1893                 if (dcrc)
1894                         submode |= 2;
1895                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1896         } else
1897                 cxgbi_skcb_ulp_mode(skb) = 0;
1898 }
1899
1900 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1901                               unsigned int count)
1902 {
1903         struct iscsi_conn *conn = task->conn;
1904         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1905         struct sk_buff *skb = tdata->skb;
1906         unsigned int datalen = count;
1907         int i, padlen = iscsi_padding(count);
1908         struct page *pg;
1909
1910         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1911                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1912                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1913                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1914
1915         skb_put(skb, task->hdr_len);
1916         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1917         if (!count)
1918                 return 0;
1919
1920         if (task->sc) {
1921                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1922                 struct scatterlist *sg = NULL;
1923                 int err;
1924
1925                 tdata->offset = offset;
1926                 tdata->count = count;
1927                 err = sgl_seek_offset(
1928                                         sdb->table.sgl, sdb->table.nents,
1929                                         tdata->offset, &tdata->sgoffset, &sg);
1930                 if (err < 0) {
1931                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1932                                 sdb->table.nents, tdata->offset, sdb->length);
1933                         return err;
1934                 }
1935                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1936                                         tdata->frags, MAX_PDU_FRAGS);
1937                 if (err < 0) {
1938                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1939                                 sdb->table.nents, tdata->offset, tdata->count);
1940                         return err;
1941                 }
1942                 tdata->nr_frags = err;
1943
1944                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1945                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1946                         char *dst = skb->data + task->hdr_len;
1947                         skb_frag_t *frag = tdata->frags;
1948
1949                         /* data fits in the skb's headroom */
1950                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1951                                 char *src = kmap_atomic(frag->page,
1952                                                         KM_SOFTIRQ0);
1953
1954                                 memcpy(dst, src+frag->page_offset, skb_frag_size(frag));
1955                                 dst += skb_frag_size(frag);
1956                                 kunmap_atomic(src, KM_SOFTIRQ0);
1957                         }
1958                         if (padlen) {
1959                                 memset(dst, 0, padlen);
1960                                 padlen = 0;
1961                         }
1962                         skb_put(skb, count + padlen);
1963                 } else {
1964                         /* data fit into frag_list */
1965                         for (i = 0; i < tdata->nr_frags; i++)
1966                                 get_page(tdata->frags[i].page);
1967
1968                         memcpy(skb_shinfo(skb)->frags, tdata->frags,
1969                                 sizeof(skb_frag_t) * tdata->nr_frags);
1970                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1971                         skb->len += count;
1972                         skb->data_len += count;
1973                         skb->truesize += count;
1974                 }
1975
1976         } else {
1977                 pg = virt_to_page(task->data);
1978
1979                 get_page(pg);
1980                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1981                                         count);
1982                 skb->len += count;
1983                 skb->data_len += count;
1984                 skb->truesize += count;
1985         }
1986
1987         if (padlen) {
1988                 i = skb_shinfo(skb)->nr_frags;
1989                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1990                                 virt_to_page(padding), offset_in_page(padding),
1991                                 padlen);
1992
1993                 skb->data_len += padlen;
1994                 skb->truesize += padlen;
1995                 skb->len += padlen;
1996         }
1997
1998         return 0;
1999 }
2000 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2001
2002 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2003 {
2004         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2005         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2006         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2007         struct sk_buff *skb = tdata->skb;
2008         unsigned int datalen;
2009         int err;
2010
2011         if (!skb) {
2012                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2013                         "task 0x%p, skb NULL.\n", task);
2014                 return 0;
2015         }
2016
2017         datalen = skb->data_len;
2018         tdata->skb = NULL;
2019         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2020         if (err > 0) {
2021                 int pdulen = err;
2022
2023                 log_debug(1 << CXGBI_DBG_PDU_TX,
2024                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2025                         task, task->sc, skb, skb->len, skb->data_len, err);
2026
2027                 if (task->conn->hdrdgst_en)
2028                         pdulen += ISCSI_DIGEST_SIZE;
2029
2030                 if (datalen && task->conn->datadgst_en)
2031                         pdulen += ISCSI_DIGEST_SIZE;
2032
2033                 task->conn->txdata_octets += pdulen;
2034                 return 0;
2035         }
2036
2037         if (err == -EAGAIN || err == -ENOBUFS) {
2038                 log_debug(1 << CXGBI_DBG_PDU_TX,
2039                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2040                         task, skb, skb->len, skb->data_len, err);
2041                 /* reset skb to send when we are called again */
2042                 tdata->skb = skb;
2043                 return err;
2044         }
2045
2046         kfree_skb(skb);
2047         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2049                 task->itt, skb, skb->len, skb->data_len, err);
2050         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2051         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2052         return err;
2053 }
2054 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2055
2056 void cxgbi_cleanup_task(struct iscsi_task *task)
2057 {
2058         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2059
2060         log_debug(1 << CXGBI_DBG_ISCSI,
2061                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2062                 task, tdata->skb, task->hdr_itt);
2063
2064         /*  never reached the xmit task callout */
2065         if (tdata->skb)
2066                 __kfree_skb(tdata->skb);
2067         memset(tdata, 0, sizeof(*tdata));
2068
2069         task_release_itt(task, task->hdr_itt);
2070         iscsi_tcp_cleanup_task(task);
2071 }
2072 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2073
2074 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2075                                 struct iscsi_stats *stats)
2076 {
2077         struct iscsi_conn *conn = cls_conn->dd_data;
2078
2079         stats->txdata_octets = conn->txdata_octets;
2080         stats->rxdata_octets = conn->rxdata_octets;
2081         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2082         stats->dataout_pdus = conn->dataout_pdus_cnt;
2083         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2084         stats->datain_pdus = conn->datain_pdus_cnt;
2085         stats->r2t_pdus = conn->r2t_pdus_cnt;
2086         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2087         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2088         stats->digest_err = 0;
2089         stats->timeout_err = 0;
2090         stats->custom_length = 1;
2091         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2092         stats->custom[0].value = conn->eh_abort_cnt;
2093 }
2094 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2095
2096 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2097 {
2098         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2099         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2100         struct cxgbi_device *cdev = cconn->chba->cdev;
2101         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2102         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2103         unsigned int max = max(max_def, headroom);
2104
2105         max = min(cconn->chba->cdev->tx_max_size, max);
2106         if (conn->max_xmit_dlength)
2107                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2108         else
2109                 conn->max_xmit_dlength = max;
2110         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2111
2112         return 0;
2113 }
2114
2115 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2116 {
2117         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2118         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2119         unsigned int max = cconn->chba->cdev->rx_max_size;
2120
2121         cxgbi_align_pdu_size(max);
2122
2123         if (conn->max_recv_dlength) {
2124                 if (conn->max_recv_dlength > max) {
2125                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2126                                 conn->max_recv_dlength, max);
2127                         return -EINVAL;
2128                 }
2129                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2130                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2131         } else
2132                 conn->max_recv_dlength = max;
2133
2134         return 0;
2135 }
2136
2137 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2138                         enum iscsi_param param, char *buf, int buflen)
2139 {
2140         struct iscsi_conn *conn = cls_conn->dd_data;
2141         struct iscsi_session *session = conn->session;
2142         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2143         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2144         struct cxgbi_sock *csk = cconn->cep->csk;
2145         int value, err = 0;
2146
2147         log_debug(1 << CXGBI_DBG_ISCSI,
2148                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2149                 cls_conn, param, buflen, buf);
2150
2151         switch (param) {
2152         case ISCSI_PARAM_HDRDGST_EN:
2153                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2154                 if (!err && conn->hdrdgst_en)
2155                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2156                                                         conn->hdrdgst_en,
2157                                                         conn->datadgst_en, 0);
2158                 break;
2159         case ISCSI_PARAM_DATADGST_EN:
2160                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2161                 if (!err && conn->datadgst_en)
2162                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2163                                                         conn->hdrdgst_en,
2164                                                         conn->datadgst_en, 0);
2165                 break;
2166         case ISCSI_PARAM_MAX_R2T:
2167                 sscanf(buf, "%d", &value);
2168                 if (value <= 0 || !is_power_of_2(value))
2169                         return -EINVAL;
2170                 if (session->max_r2t == value)
2171                         break;
2172                 iscsi_tcp_r2tpool_free(session);
2173                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2174                 if (!err && iscsi_tcp_r2tpool_alloc(session))
2175                         return -ENOMEM;
2176         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2177                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2178                 if (!err)
2179                         err = cxgbi_conn_max_recv_dlength(conn);
2180                 break;
2181         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2182                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2183                 if (!err)
2184                         err = cxgbi_conn_max_xmit_dlength(conn);
2185                 break;
2186         default:
2187                 return iscsi_set_param(cls_conn, param, buf, buflen);
2188         }
2189         return err;
2190 }
2191 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2192
2193 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2194                        char *buf)
2195 {
2196         struct cxgbi_endpoint *cep = ep->dd_data;
2197         struct cxgbi_sock *csk;
2198         int len;
2199
2200         log_debug(1 << CXGBI_DBG_ISCSI,
2201                 "cls_conn 0x%p, param %d.\n", ep, param);
2202
2203         switch (param) {
2204         case ISCSI_PARAM_CONN_PORT:
2205         case ISCSI_PARAM_CONN_ADDRESS:
2206                 if (!cep)
2207                         return -ENOTCONN;
2208
2209                 csk = cep->csk;
2210                 if (!csk)
2211                         return -ENOTCONN;
2212
2213                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2214                                                  &csk->daddr, param, buf);
2215         default:
2216                 return -ENOSYS;
2217         }
2218         return len;
2219 }
2220 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2221
2222 struct iscsi_cls_conn *
2223 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2224 {
2225         struct iscsi_cls_conn *cls_conn;
2226         struct iscsi_conn *conn;
2227         struct iscsi_tcp_conn *tcp_conn;
2228         struct cxgbi_conn *cconn;
2229
2230         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2231         if (!cls_conn)
2232                 return NULL;
2233
2234         conn = cls_conn->dd_data;
2235         tcp_conn = conn->dd_data;
2236         cconn = tcp_conn->dd_data;
2237         cconn->iconn = conn;
2238
2239         log_debug(1 << CXGBI_DBG_ISCSI,
2240                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2241                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2242
2243         return cls_conn;
2244 }
2245 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2246
2247 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2248                                 struct iscsi_cls_conn *cls_conn,
2249                                 u64 transport_eph, int is_leading)
2250 {
2251         struct iscsi_conn *conn = cls_conn->dd_data;
2252         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2253         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2254         struct iscsi_endpoint *ep;
2255         struct cxgbi_endpoint *cep;
2256         struct cxgbi_sock *csk;
2257         int err;
2258
2259         ep = iscsi_lookup_endpoint(transport_eph);
2260         if (!ep)
2261                 return -EINVAL;
2262
2263         /*  setup ddp pagesize */
2264         cep = ep->dd_data;
2265         csk = cep->csk;
2266         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2267         if (err < 0)
2268                 return err;
2269
2270         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2271         if (err)
2272                 return -EINVAL;
2273
2274         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2275         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2276
2277         write_lock_bh(&csk->callback_lock);
2278         csk->user_data = conn;
2279         cconn->chba = cep->chba;
2280         cconn->cep = cep;
2281         cep->cconn = cconn;
2282         write_unlock_bh(&csk->callback_lock);
2283
2284         cxgbi_conn_max_xmit_dlength(conn);
2285         cxgbi_conn_max_recv_dlength(conn);
2286
2287         log_debug(1 << CXGBI_DBG_ISCSI,
2288                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2289                 cls_session, cls_conn, ep, cconn, csk);
2290         /*  init recv engine */
2291         iscsi_tcp_hdr_recv_prep(tcp_conn);
2292
2293         return 0;
2294 }
2295 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2296
2297 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2298                                                 u16 cmds_max, u16 qdepth,
2299                                                 u32 initial_cmdsn)
2300 {
2301         struct cxgbi_endpoint *cep;
2302         struct cxgbi_hba *chba;
2303         struct Scsi_Host *shost;
2304         struct iscsi_cls_session *cls_session;
2305         struct iscsi_session *session;
2306
2307         if (!ep) {
2308                 pr_err("missing endpoint.\n");
2309                 return NULL;
2310         }
2311
2312         cep = ep->dd_data;
2313         chba = cep->chba;
2314         shost = chba->shost;
2315
2316         BUG_ON(chba != iscsi_host_priv(shost));
2317
2318         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2319                                         cmds_max, 0,
2320                                         sizeof(struct iscsi_tcp_task) +
2321                                         sizeof(struct cxgbi_task_data),
2322                                         initial_cmdsn, ISCSI_MAX_TARGET);
2323         if (!cls_session)
2324                 return NULL;
2325
2326         session = cls_session->dd_data;
2327         if (iscsi_tcp_r2tpool_alloc(session))
2328                 goto remove_session;
2329
2330         log_debug(1 << CXGBI_DBG_ISCSI,
2331                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2332         return cls_session;
2333
2334 remove_session:
2335         iscsi_session_teardown(cls_session);
2336         return NULL;
2337 }
2338 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2339
2340 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2341 {
2342         log_debug(1 << CXGBI_DBG_ISCSI,
2343                 "cls sess 0x%p.\n", cls_session);
2344
2345         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2346         iscsi_session_teardown(cls_session);
2347 }
2348 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2349
2350 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2351                         char *buf, int buflen)
2352 {
2353         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2354
2355         if (!chba->ndev) {
2356                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2357                                 "netdev for host not set.\n");
2358                 return -ENODEV;
2359         }
2360
2361         log_debug(1 << CXGBI_DBG_ISCSI,
2362                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2363                 shost, chba, chba->ndev->name, param, buflen, buf);
2364
2365         switch (param) {
2366         case ISCSI_HOST_PARAM_IPADDRESS:
2367         {
2368                 __be32 addr = in_aton(buf);
2369                 log_debug(1 << CXGBI_DBG_ISCSI,
2370                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2371                 cxgbi_set_iscsi_ipv4(chba, addr);
2372                 return 0;
2373         }
2374         case ISCSI_HOST_PARAM_HWADDRESS:
2375         case ISCSI_HOST_PARAM_NETDEV_NAME:
2376                 return 0;
2377         default:
2378                 return iscsi_host_set_param(shost, param, buf, buflen);
2379         }
2380 }
2381 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2382
2383 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2384                         char *buf)
2385 {
2386         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2387         int len = 0;
2388
2389         if (!chba->ndev) {
2390                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2391                                 "netdev for host not set.\n");
2392                 return -ENODEV;
2393         }
2394
2395         log_debug(1 << CXGBI_DBG_ISCSI,
2396                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2397                 shost, chba, chba->ndev->name, param);
2398
2399         switch (param) {
2400         case ISCSI_HOST_PARAM_HWADDRESS:
2401                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2402                 break;
2403         case ISCSI_HOST_PARAM_NETDEV_NAME:
2404                 len = sprintf(buf, "%s\n", chba->ndev->name);
2405                 break;
2406         case ISCSI_HOST_PARAM_IPADDRESS:
2407         {
2408                 __be32 addr;
2409
2410                 addr = cxgbi_get_iscsi_ipv4(chba);
2411                 len = sprintf(buf, "%pI4", &addr);
2412                 log_debug(1 << CXGBI_DBG_ISCSI,
2413                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2414                 break;
2415         }
2416         default:
2417                 return iscsi_host_get_param(shost, param, buf);
2418         }
2419
2420         return len;
2421 }
2422 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2423
2424 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2425                                         struct sockaddr *dst_addr,
2426                                         int non_blocking)
2427 {
2428         struct iscsi_endpoint *ep;
2429         struct cxgbi_endpoint *cep;
2430         struct cxgbi_hba *hba = NULL;
2431         struct cxgbi_sock *csk;
2432         int err = -EINVAL;
2433
2434         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2435                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2436                 shost, non_blocking, dst_addr);
2437
2438         if (shost) {
2439                 hba = iscsi_host_priv(shost);
2440                 if (!hba) {
2441                         pr_info("shost 0x%p, priv NULL.\n", shost);
2442                         goto err_out;
2443                 }
2444         }
2445
2446         csk = cxgbi_check_route(dst_addr);
2447         if (IS_ERR(csk))
2448                 return (struct iscsi_endpoint *)csk;
2449         cxgbi_sock_get(csk);
2450
2451         if (!hba)
2452                 hba = csk->cdev->hbas[csk->port_id];
2453         else if (hba != csk->cdev->hbas[csk->port_id]) {
2454                 pr_info("Could not connect through requested host %u"
2455                         "hba 0x%p != 0x%p (%u).\n",
2456                         shost->host_no, hba,
2457                         csk->cdev->hbas[csk->port_id], csk->port_id);
2458                 err = -ENOSPC;
2459                 goto release_conn;
2460         }
2461
2462         err = sock_get_port(csk);
2463         if (err)
2464                 goto release_conn;
2465
2466         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2467         err = csk->cdev->csk_init_act_open(csk);
2468         if (err)
2469                 goto release_conn;
2470
2471         if (cxgbi_sock_is_closing(csk)) {
2472                 err = -ENOSPC;
2473                 pr_info("csk 0x%p is closing.\n", csk);
2474                 goto release_conn;
2475         }
2476
2477         ep = iscsi_create_endpoint(sizeof(*cep));
2478         if (!ep) {
2479                 err = -ENOMEM;
2480                 pr_info("iscsi alloc ep, OOM.\n");
2481                 goto release_conn;
2482         }
2483
2484         cep = ep->dd_data;
2485         cep->csk = csk;
2486         cep->chba = hba;
2487
2488         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2489                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2490                 ep, cep, csk, hba, hba->ndev->name);
2491         return ep;
2492
2493 release_conn:
2494         cxgbi_sock_put(csk);
2495         cxgbi_sock_closed(csk);
2496 err_out:
2497         return ERR_PTR(err);
2498 }
2499 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2500
2501 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2502 {
2503         struct cxgbi_endpoint *cep = ep->dd_data;
2504         struct cxgbi_sock *csk = cep->csk;
2505
2506         if (!cxgbi_sock_is_established(csk))
2507                 return 0;
2508         return 1;
2509 }
2510 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2511
2512 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2513 {
2514         struct cxgbi_endpoint *cep = ep->dd_data;
2515         struct cxgbi_conn *cconn = cep->cconn;
2516         struct cxgbi_sock *csk = cep->csk;
2517
2518         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2519                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2520                 ep, cep, cconn, csk, csk->state, csk->flags);
2521
2522         if (cconn && cconn->iconn) {
2523                 iscsi_suspend_tx(cconn->iconn);
2524                 write_lock_bh(&csk->callback_lock);
2525                 cep->csk->user_data = NULL;
2526                 cconn->cep = NULL;
2527                 write_unlock_bh(&csk->callback_lock);
2528         }
2529         iscsi_destroy_endpoint(ep);
2530
2531         if (likely(csk->state >= CTP_ESTABLISHED))
2532                 need_active_close(csk);
2533         else
2534                 cxgbi_sock_closed(csk);
2535
2536         cxgbi_sock_put(csk);
2537 }
2538 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2539
2540 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2541                         struct scsi_transport_template **stt)
2542 {
2543         *stt = iscsi_register_transport(itp);
2544         if (*stt == NULL) {
2545                 pr_err("unable to register %s transport 0x%p.\n",
2546                         itp->name, itp);
2547                 return -ENODEV;
2548         }
2549         log_debug(1 << CXGBI_DBG_ISCSI,
2550                 "%s, registered iscsi transport 0x%p.\n",
2551                 itp->name, stt);
2552         return 0;
2553 }
2554 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2555
2556 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2557                         struct scsi_transport_template **stt)
2558 {
2559         if (*stt) {
2560                 log_debug(1 << CXGBI_DBG_ISCSI,
2561                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2562                         itp, itp->name, *stt);
2563                 *stt = NULL;
2564                 iscsi_unregister_transport(itp);
2565         }
2566 }
2567 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2568
2569 static int __init libcxgbi_init_module(void)
2570 {
2571         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2572         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2573
2574         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2575                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2576                 ISCSI_AGE_MASK, sw_tag_age_bits);
2577
2578         ddp_setup_host_page_size();
2579         return 0;
2580 }
2581
2582 static void __exit libcxgbi_exit_module(void)
2583 {
2584         cxgbi_device_unregister_all(0xFF);
2585         return;
2586 }
2587
2588 module_init(libcxgbi_init_module);
2589 module_exit(libcxgbi_exit_module);