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 <linux/module.h>
  29 #include <net/tcp.h>
  30
  31 static unsigned int dbg_level;
  32
  33 #include "libcxgbi.h"
  34
  35 #define DRV_MODULE_NAME         "libcxgbi"
  36 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  37 #define DRV_MODULE_VERSION      "0.9.0"
  38 #define DRV_MODULE_RELDATE      "Jun. 2010"
  39
  40 MODULE_AUTHOR("Chelsio Communications, Inc.");
  41 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  42 MODULE_VERSION(DRV_MODULE_VERSION);
  43 MODULE_LICENSE("GPL");
  44
  45 module_param(dbg_level, uint, 0644);
  46 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  47
  48
  49 /*
  50  * cxgbi device management
  51  * maintains a list of the cxgbi devices
  52  */
  53 static LIST_HEAD(cdev_list);
  54 static DEFINE_MUTEX(cdev_mutex);
  55
  56 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  57                                 unsigned int max_conn)
  58 {
  59         struct cxgbi_ports_map *pmap = &cdev->pmap;
  60
  61         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  62                                              sizeof(struct cxgbi_sock *),
  63                                              GFP_KERNEL);
  64         if (!pmap->port_csk) {
  65                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  66                 return -ENOMEM;
  67         }
  68
  69         pmap->max_connect = max_conn;
  70         pmap->sport_base = base;
  71         spin_lock_init(&pmap->lock);
  72         return 0;
  73 }
  74 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  75
  76 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79         struct cxgbi_sock *csk;
  80         int i;
  81
  82         for (i = 0; i < pmap->max_connect; i++) {
  83                 if (pmap->port_csk[i]) {
  84                         csk = pmap->port_csk[i];
  85                         pmap->port_csk[i] = NULL;
  86                         log_debug(1 << CXGBI_DBG_SOCK,
  87                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  88                                 csk, cdev);
  89                         spin_lock_bh(&csk->lock);
  90                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  91                         cxgbi_sock_closed(csk);
  92                         spin_unlock_bh(&csk->lock);
  93                         cxgbi_sock_put(csk);
  94                 }
  95         }
  96 }
  97 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
  98
  99 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 100 {
 101         log_debug(1 << CXGBI_DBG_DEV,
 102                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 103         cxgbi_hbas_remove(cdev);
 104         cxgbi_device_portmap_cleanup(cdev);
 105         if (cdev->dev_ddp_cleanup)
 106                 cdev->dev_ddp_cleanup(cdev);
 107         else
 108                 cxgbi_ddp_cleanup(cdev);
 109         if (cdev->ddp)
 110                 cxgbi_ddp_cleanup(cdev);
 111         if (cdev->pmap.max_connect)
 112                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 113         kfree(cdev);
 114 }
 115
 116 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 117                                            unsigned int nports)
 118 {
 119         struct cxgbi_device *cdev;
 120
 121         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 122                         (sizeof(struct cxgbi_hba *) +
 123                          sizeof(struct net_device *)),
 124                         GFP_KERNEL);
 125         if (!cdev) {
 126                 pr_warn("nport %d, OOM.\n", nports);
 127                 return NULL;
 128         }
 129         cdev->ports = (struct net_device **)(cdev + 1);
 130         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 131                                                 sizeof(struct net_device *));
 132         if (extra)
 133                 cdev->dd_data = ((char *)cdev->hbas) +
 134                                 nports * sizeof(struct cxgbi_hba *);
 135         spin_lock_init(&cdev->pmap.lock);
 136
 137         mutex_lock(&cdev_mutex);
 138         list_add_tail(&cdev->list_head, &cdev_list);
 139         mutex_unlock(&cdev_mutex);
 140
 141         log_debug(1 << CXGBI_DBG_DEV,
 142                 "cdev 0x%p, p# %u.\n", cdev, nports);
 143         return cdev;
 144 }
 145 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 146
 147 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 148 {
 149         log_debug(1 << CXGBI_DBG_DEV,
 150                 "cdev 0x%p, p# %u,%s.\n",
 151                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 152         mutex_lock(&cdev_mutex);
 153         list_del(&cdev->list_head);
 154         mutex_unlock(&cdev_mutex);
 155         cxgbi_device_destroy(cdev);
 156 }
 157 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 158
 159 void cxgbi_device_unregister_all(unsigned int flag)
 160 {
 161         struct cxgbi_device *cdev, *tmp;
 162
 163         mutex_lock(&cdev_mutex);
 164         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 165                 if ((cdev->flags & flag) == flag) {
 166                         log_debug(1 << CXGBI_DBG_DEV,
 167                                 "cdev 0x%p, p# %u,%s.\n",
 168                                 cdev, cdev->nports, cdev->nports ?
 169                                  cdev->ports[0]->name : "");
 170                         list_del(&cdev->list_head);
 171                         cxgbi_device_destroy(cdev);
 172                 }
 173         }
 174         mutex_unlock(&cdev_mutex);
 175 }
 176 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 177
 178 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 179 {
 180         struct cxgbi_device *cdev, *tmp;
 181
 182         mutex_lock(&cdev_mutex);
 183         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 184                 if (cdev->lldev == lldev) {
 185                         mutex_unlock(&cdev_mutex);
 186                         return cdev;
 187                 }
 188         }
 189         mutex_unlock(&cdev_mutex);
 190         log_debug(1 << CXGBI_DBG_DEV,
 191                 "lldev 0x%p, NO match found.\n", lldev);
 192         return NULL;
 193 }
 194 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 195
 196 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 197                                                         int *port)
 198 {
 199         struct net_device *vdev = NULL;
 200         struct cxgbi_device *cdev, *tmp;
 201         int i;
 202
 203         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 204                 vdev = ndev;
 205                 ndev = vlan_dev_real_dev(ndev);
 206                 log_debug(1 << CXGBI_DBG_DEV,
 207                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 208         }
 209
 210         mutex_lock(&cdev_mutex);
 211         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 212                 for (i = 0; i < cdev->nports; i++) {
 213                         if (ndev == cdev->ports[i]) {
 214                                 cdev->hbas[i]->vdev = vdev;
 215                                 mutex_unlock(&cdev_mutex);
 216                                 if (port)
 217                                         *port = i;
 218                                 return cdev;
 219                         }
 220                 }
 221         }
 222         mutex_unlock(&cdev_mutex);
 223         log_debug(1 << CXGBI_DBG_DEV,
 224                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 225         return NULL;
 226 }
 227
 228 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 229 {
 230         int i;
 231         struct cxgbi_hba *chba;
 232
 233         log_debug(1 << CXGBI_DBG_DEV,
 234                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 235
 236         for (i = 0; i < cdev->nports; i++) {
 237                 chba = cdev->hbas[i];
 238                 if (chba) {
 239                         cdev->hbas[i] = NULL;
 240                         iscsi_host_remove(chba->shost);
 241                         pci_dev_put(cdev->pdev);
 242                         iscsi_host_free(chba->shost);
 243                 }
 244         }
 245 }
 246 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 247
 248 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
 249                 unsigned int max_id, struct scsi_host_template *sht,
 250                 struct scsi_transport_template *stt)
 251 {
 252         struct cxgbi_hba *chba;
 253         struct Scsi_Host *shost;
 254         int i, err;
 255
 256         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 257
 258         for (i = 0; i < cdev->nports; i++) {
 259                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 260                 if (!shost) {
 261                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 262                                 cdev, i, cdev->ports[i]->name);
 263                         err = -ENOMEM;
 264                         goto err_out;
 265                 }
 266
 267                 shost->transportt = stt;
 268                 shost->max_lun = max_lun;
 269                 shost->max_id = max_id;
 270                 shost->max_channel = 0;
 271                 shost->max_cmd_len = 16;
 272
 273                 chba = iscsi_host_priv(shost);
 274                 chba->cdev = cdev;
 275                 chba->ndev = cdev->ports[i];
 276                 chba->shost = shost;
 277
 278                 log_debug(1 << CXGBI_DBG_DEV,
 279                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 280                         cdev, i, cdev->ports[i]->name, chba);
 281
 282                 pci_dev_get(cdev->pdev);
 283                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 284                 if (err) {
 285                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 286                                 cdev, i, cdev->ports[i]->name);
 287                         pci_dev_put(cdev->pdev);
 288                         scsi_host_put(shost);
 289                         goto  err_out;
 290                 }
 291
 292                 cdev->hbas[i] = chba;
 293         }
 294
 295         return 0;
 296
 297 err_out:
 298         cxgbi_hbas_remove(cdev);
 299         return err;
 300 }
 301 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 302
 303 /*
 304  * iSCSI offload
 305  *
 306  * - source port management
 307  *   To find a free source port in the port allocation map we use a very simple
 308  *   rotor scheme to look for the next free port.
 309  *
 310  *   If a source port has been specified make sure that it doesn't collide with
 311  *   our normal source port allocation map.  If it's outside the range of our
 312  *   allocation/deallocation scheme just let them use it.
 313  *
 314  *   If the source port is outside our allocation range, the caller is
 315  *   responsible for keeping track of their port usage.
 316  */
 317 static int sock_get_port(struct cxgbi_sock *csk)
 318 {
 319         struct cxgbi_device *cdev = csk->cdev;
 320         struct cxgbi_ports_map *pmap = &cdev->pmap;
 321         unsigned int start;
 322         int idx;
 323
 324         if (!pmap->max_connect) {
 325                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 326                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 327                 return -EADDRNOTAVAIL;
 328         }
 329
 330         if (csk->saddr.sin_port) {
 331                 pr_err("source port NON-ZERO %u.\n",
 332                         ntohs(csk->saddr.sin_port));
 333                 return -EADDRINUSE;
 334         }
 335
 336         spin_lock_bh(&pmap->lock);
 337         if (pmap->used >= pmap->max_connect) {
 338                 spin_unlock_bh(&pmap->lock);
 339                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 340                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 341                 return -EADDRNOTAVAIL;
 342         }
 343
 344         start = idx = pmap->next;
 345         do {
 346                 if (++idx >= pmap->max_connect)
 347                         idx = 0;
 348                 if (!pmap->port_csk[idx]) {
 349                         pmap->used++;
 350                         csk->saddr.sin_port =
 351                                 htons(pmap->sport_base + idx);
 352                         pmap->next = idx;
 353                         pmap->port_csk[idx] = csk;
 354                         spin_unlock_bh(&pmap->lock);
 355                         cxgbi_sock_get(csk);
 356                         log_debug(1 << CXGBI_DBG_SOCK,
 357                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 358                                 cdev, csk->port_id,
 359                                 cdev->ports[csk->port_id]->name,
 360                                 pmap->sport_base + idx, pmap->next);
 361                         return 0;
 362                 }
 363         } while (idx != start);
 364         spin_unlock_bh(&pmap->lock);
 365
 366         /* should not happen */
 367         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 368                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 369                 pmap->next);
 370         return -EADDRNOTAVAIL;
 371 }
 372
 373 static void sock_put_port(struct cxgbi_sock *csk)
 374 {
 375         struct cxgbi_device *cdev = csk->cdev;
 376         struct cxgbi_ports_map *pmap = &cdev->pmap;
 377
 378         if (csk->saddr.sin_port) {
 379                 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
 380
 381                 csk->saddr.sin_port = 0;
 382                 if (idx < 0 || idx >= pmap->max_connect) {
 383                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 384                                 cdev, csk->port_id,
 385                                 cdev->ports[csk->port_id]->name,
 386                                 ntohs(csk->saddr.sin_port));
 387                         return;
 388                 }
 389
 390                 spin_lock_bh(&pmap->lock);
 391                 pmap->port_csk[idx] = NULL;
 392                 pmap->used--;
 393                 spin_unlock_bh(&pmap->lock);
 394
 395                 log_debug(1 << CXGBI_DBG_SOCK,
 396                         "cdev 0x%p, p#%u %s, release %u.\n",
 397                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 398                         pmap->sport_base + idx);
 399
 400                 cxgbi_sock_put(csk);
 401         }
 402 }
 403
 404 /*
 405  * iscsi tcp connection
 406  */
 407 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 408 {
 409         if (csk->cpl_close) {
 410                 kfree_skb(csk->cpl_close);
 411                 csk->cpl_close = NULL;
 412         }
 413         if (csk->cpl_abort_req) {
 414                 kfree_skb(csk->cpl_abort_req);
 415                 csk->cpl_abort_req = NULL;
 416         }
 417         if (csk->cpl_abort_rpl) {
 418                 kfree_skb(csk->cpl_abort_rpl);
 419                 csk->cpl_abort_rpl = NULL;
 420         }
 421 }
 422 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 423
 424 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 425 {
 426         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 427
 428         if (!csk) {
 429                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 430                 return NULL;
 431         }
 432
 433         if (cdev->csk_alloc_cpls(csk) < 0) {
 434                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 435                 kfree(csk);
 436                 return NULL;
 437         }
 438
 439         spin_lock_init(&csk->lock);
 440         kref_init(&csk->refcnt);
 441         skb_queue_head_init(&csk->receive_queue);
 442         skb_queue_head_init(&csk->write_queue);
 443         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 444         rwlock_init(&csk->callback_lock);
 445         csk->cdev = cdev;
 446         csk->flags = 0;
 447         cxgbi_sock_set_state(csk, CTP_CLOSED);
 448
 449         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 450
 451         return csk;
 452 }
 453
 454 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 455                                       __be32 saddr, __be32 daddr,
 456                                       __be16 sport, __be16 dport, u8 tos)
 457 {
 458         struct rtable *rt;
 459
 460         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 461                                    dport, sport, IPPROTO_TCP, tos, 0);
 462         if (IS_ERR(rt))
 463                 return NULL;
 464
 465         return rt;
 466 }
 467
 468 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 469 {
 470         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 471         struct dst_entry *dst;
 472         struct net_device *ndev;
 473         struct cxgbi_device *cdev;
 474         struct rtable *rt = NULL;
 475         struct flowi4 fl4;
 476         struct cxgbi_sock *csk = NULL;
 477         unsigned int mtu = 0;
 478         int port = 0xFFFF;
 479         int err = 0;
 480
 481         if (daddr->sin_family != AF_INET) {
 482                 pr_info("address family 0x%x NOT supported.\n",
 483                         daddr->sin_family);
 484                 err = -EAFNOSUPPORT;
 485                 goto err_out;
 486         }
 487
 488         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 489         if (!rt) {
 490                 pr_info("no route to ipv4 0x%x, port %u.\n",
 491                         daddr->sin_addr.s_addr, daddr->sin_port);
 492                 err = -ENETUNREACH;
 493                 goto err_out;
 494         }
 495         dst = &rt->dst;
 496         ndev = dst_get_neighbour(dst)->dev;
 497
 498         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 499                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 500                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 501                         ndev->name);
 502                 err = -ENETUNREACH;
 503                 goto rel_rt;
 504         }
 505
 506         if (ndev->flags & IFF_LOOPBACK) {
 507                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 508                 mtu = ndev->mtu;
 509                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 510                         dst_get_neighbour(dst)->dev->name, ndev->name, mtu);
 511         }
 512
 513         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 514         if (!cdev) {
 515                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 516                         &daddr->sin_addr.s_addr, ndev->name);
 517                 err = -ENETUNREACH;
 518                 goto rel_rt;
 519         }
 520         log_debug(1 << CXGBI_DBG_SOCK,
 521                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 522                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 523                            port, ndev->name, cdev);
 524
 525         csk = cxgbi_sock_create(cdev);
 526         if (!csk) {
 527                 err = -ENOMEM;
 528                 goto rel_rt;
 529         }
 530         csk->cdev = cdev;
 531         csk->port_id = port;
 532         csk->mtu = mtu;
 533         csk->dst = dst;
 534         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 535         csk->daddr.sin_port = daddr->sin_port;
 536         csk->daddr.sin_family = daddr->sin_family;
 537         csk->saddr.sin_addr.s_addr = fl4.saddr;
 538
 539         return csk;
 540
 541 rel_rt:
 542         ip_rt_put(rt);
 543         if (csk)
 544                 cxgbi_sock_closed(csk);
 545 err_out:
 546         return ERR_PTR(err);
 547 }
 548
 549 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 550                         unsigned int opt)
 551 {
 552         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 553         dst_confirm(csk->dst);
 554         smp_mb();
 555         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 556 }
 557 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 558
 559 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 560 {
 561         log_debug(1 << CXGBI_DBG_SOCK,
 562                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 563                 csk, csk->state, csk->flags, csk->user_data);
 564
 565         if (csk->state != CTP_ESTABLISHED) {
 566                 read_lock_bh(&csk->callback_lock);
 567                 if (csk->user_data)
 568                         iscsi_conn_failure(csk->user_data,
 569                                         ISCSI_ERR_CONN_FAILED);
 570                 read_unlock_bh(&csk->callback_lock);
 571         }
 572 }
 573
 574 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 575 {
 576         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 577                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 578         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 579         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 580                 return;
 581         if (csk->saddr.sin_port)
 582                 sock_put_port(csk);
 583         if (csk->dst)
 584                 dst_release(csk->dst);
 585         csk->cdev->csk_release_offload_resources(csk);
 586         cxgbi_sock_set_state(csk, CTP_CLOSED);
 587         cxgbi_inform_iscsi_conn_closing(csk);
 588         cxgbi_sock_put(csk);
 589 }
 590 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 591
 592 static void need_active_close(struct cxgbi_sock *csk)
 593 {
 594         int data_lost;
 595         int close_req = 0;
 596
 597         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 598                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 599         spin_lock_bh(&csk->lock);
 600         dst_confirm(csk->dst);
 601         data_lost = skb_queue_len(&csk->receive_queue);
 602         __skb_queue_purge(&csk->receive_queue);
 603
 604         if (csk->state == CTP_ACTIVE_OPEN)
 605                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 606         else if (csk->state == CTP_ESTABLISHED) {
 607                 close_req = 1;
 608                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 609         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 610                 close_req = 1;
 611                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 612         }
 613
 614         if (close_req) {
 615                 if (data_lost)
 616                         csk->cdev->csk_send_abort_req(csk);
 617                 else
 618                         csk->cdev->csk_send_close_req(csk);
 619         }
 620
 621         spin_unlock_bh(&csk->lock);
 622 }
 623
 624 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 625 {
 626         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 627                         csk, csk->state, csk->flags,
 628                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 629                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 630                         errno);
 631
 632         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 633         csk->err = errno;
 634         cxgbi_sock_closed(csk);
 635 }
 636 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 637
 638 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 639 {
 640         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 641
 642         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 643                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 644         cxgbi_sock_get(csk);
 645         spin_lock_bh(&csk->lock);
 646         if (csk->state == CTP_ACTIVE_OPEN)
 647                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 648         spin_unlock_bh(&csk->lock);
 649         cxgbi_sock_put(csk);
 650         __kfree_skb(skb);
 651 }
 652 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 653
 654 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 655 {
 656         cxgbi_sock_get(csk);
 657         spin_lock_bh(&csk->lock);
 658         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 659                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 660                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 661                 else {
 662                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 663                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 664                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 665                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 666                                         csk, csk->state, csk->flags, csk->tid);
 667                         cxgbi_sock_closed(csk);
 668                 }
 669         }
 670         spin_unlock_bh(&csk->lock);
 671         cxgbi_sock_put(csk);
 672 }
 673 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 674
 675 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 676 {
 677         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 678                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 679         cxgbi_sock_get(csk);
 680         spin_lock_bh(&csk->lock);
 681
 682         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 683                 goto done;
 684
 685         switch (csk->state) {
 686         case CTP_ESTABLISHED:
 687                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 688                 break;
 689         case CTP_ACTIVE_CLOSE:
 690                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 691                 break;
 692         case CTP_CLOSE_WAIT_1:
 693                 cxgbi_sock_closed(csk);
 694                 break;
 695         case CTP_ABORTING:
 696                 break;
 697         default:
 698                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 699                         csk, csk->state, csk->flags, csk->tid);
 700         }
 701         cxgbi_inform_iscsi_conn_closing(csk);
 702 done:
 703         spin_unlock_bh(&csk->lock);
 704         cxgbi_sock_put(csk);
 705 }
 706 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 707
 708 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 709 {
 710         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 711                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 712         cxgbi_sock_get(csk);
 713         spin_lock_bh(&csk->lock);
 714
 715         csk->snd_una = snd_nxt - 1;
 716         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 717                 goto done;
 718
 719         switch (csk->state) {
 720         case CTP_ACTIVE_CLOSE:
 721                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 722                 break;
 723         case CTP_CLOSE_WAIT_1:
 724         case CTP_CLOSE_WAIT_2:
 725                 cxgbi_sock_closed(csk);
 726                 break;
 727         case CTP_ABORTING:
 728                 break;
 729         default:
 730                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 731                         csk, csk->state, csk->flags, csk->tid);
 732         }
 733 done:
 734         spin_unlock_bh(&csk->lock);
 735         cxgbi_sock_put(csk);
 736 }
 737 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 738
 739 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 740                            unsigned int snd_una, int seq_chk)
 741 {
 742         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 743                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 744                         csk, csk->state, csk->flags, csk->tid, credits,
 745                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 746
 747         spin_lock_bh(&csk->lock);
 748
 749         csk->wr_cred += credits;
 750         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 751                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 752
 753         while (credits) {
 754                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 755
 756                 if (unlikely(!p)) {
 757                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 758                                 csk, csk->state, csk->flags, csk->tid, credits,
 759                                 csk->wr_cred, csk->wr_una_cred);
 760                         break;
 761                 }
 762
 763                 if (unlikely(credits < p->csum)) {
 764                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 765                                 csk, csk->state, csk->flags, csk->tid,
 766                                 credits, csk->wr_cred, csk->wr_una_cred,
 767                                 p->csum);
 768                         p->csum -= credits;
 769                         break;
 770                 } else {
 771                         cxgbi_sock_dequeue_wr(csk);
 772                         credits -= p->csum;
 773                         kfree_skb(p);
 774                 }
 775         }
 776
 777         cxgbi_sock_check_wr_invariants(csk);
 778
 779         if (seq_chk) {
 780                 if (unlikely(before(snd_una, csk->snd_una))) {
 781                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
 782                                 csk, csk->state, csk->flags, csk->tid, snd_una,
 783                                 csk->snd_una);
 784                         goto done;
 785                 }
 786
 787                 if (csk->snd_una != snd_una) {
 788                         csk->snd_una = snd_una;
 789                         dst_confirm(csk->dst);
 790                 }
 791         }
 792
 793         if (skb_queue_len(&csk->write_queue)) {
 794                 if (csk->cdev->csk_push_tx_frames(csk, 0))
 795                         cxgbi_conn_tx_open(csk);
 796         } else
 797                 cxgbi_conn_tx_open(csk);
 798 done:
 799         spin_unlock_bh(&csk->lock);
 800 }
 801 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
 802
 803 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
 804                                              unsigned short mtu)
 805 {
 806         int i = 0;
 807
 808         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
 809                 ++i;
 810
 811         return i;
 812 }
 813
 814 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
 815 {
 816         unsigned int idx;
 817         struct dst_entry *dst = csk->dst;
 818
 819         csk->advmss = dst_metric_advmss(dst);
 820
 821         if (csk->advmss > pmtu - 40)
 822                 csk->advmss = pmtu - 40;
 823         if (csk->advmss < csk->cdev->mtus[0] - 40)
 824                 csk->advmss = csk->cdev->mtus[0] - 40;
 825         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
 826
 827         return idx;
 828 }
 829 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
 830
 831 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
 832 {
 833         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
 834         __skb_queue_tail(&csk->write_queue, skb);
 835 }
 836 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
 837
 838 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
 839 {
 840         struct sk_buff *skb;
 841
 842         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
 843                 kfree_skb(skb);
 844 }
 845 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
 846
 847 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
 848 {
 849         int pending = cxgbi_sock_count_pending_wrs(csk);
 850
 851         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
 852                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
 853                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
 854 }
 855 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
 856
 857 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
 858 {
 859         struct cxgbi_device *cdev = csk->cdev;
 860         struct sk_buff *next;
 861         int err, copied = 0;
 862
 863         spin_lock_bh(&csk->lock);
 864
 865         if (csk->state != CTP_ESTABLISHED) {
 866                 log_debug(1 << CXGBI_DBG_PDU_TX,
 867                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
 868                         csk, csk->state, csk->flags, csk->tid);
 869                 err = -EAGAIN;
 870                 goto out_err;
 871         }
 872
 873         if (csk->err) {
 874                 log_debug(1 << CXGBI_DBG_PDU_TX,
 875                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
 876                         csk, csk->state, csk->flags, csk->tid, csk->err);
 877                 err = -EPIPE;
 878                 goto out_err;
 879         }
 880
 881         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
 882                 log_debug(1 << CXGBI_DBG_PDU_TX,
 883                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
 884                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
 885                         csk->snd_una, cdev->snd_win);
 886                 err = -ENOBUFS;
 887                 goto out_err;
 888         }
 889
 890         while (skb) {
 891                 int frags = skb_shinfo(skb)->nr_frags +
 892                                 (skb->len != skb->data_len);
 893
 894                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
 895                         pr_err("csk 0x%p, skb head %u < %u.\n",
 896                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
 897                         err = -EINVAL;
 898                         goto out_err;
 899                 }
 900
 901                 if (frags >= SKB_WR_LIST_SIZE) {
 902                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
 903                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
 904                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
 905                         err = -EINVAL;
 906                         goto out_err;
 907                 }
 908
 909                 next = skb->next;
 910                 skb->next = NULL;
 911                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
 912                 cxgbi_sock_skb_entail(csk, skb);
 913                 copied += skb->len;
 914                 csk->write_seq += skb->len +
 915                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 916                 skb = next;
 917         }
 918 done:
 919         if (likely(skb_queue_len(&csk->write_queue)))
 920                 cdev->csk_push_tx_frames(csk, 1);
 921         spin_unlock_bh(&csk->lock);
 922         return copied;
 923
 924 out_err:
 925         if (copied == 0 && err == -EPIPE)
 926                 copied = csk->err ? csk->err : -EPIPE;
 927         else
 928                 copied = err;
 929         goto done;
 930 }
 931
 932 /*
 933  * Direct Data Placement -
 934  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
 935  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
 936  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
 937  * The host memory address is programmed into h/w in the format of pagepod
 938  * entries.
 939  * The location of the pagepod entry is encoded into ddp tag which is used as
 940  * the base for ITT/TTT.
 941  */
 942
 943 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
 944 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
 945 static unsigned char page_idx = DDP_PGIDX_MAX;
 946
 947 static unsigned char sw_tag_idx_bits;
 948 static unsigned char sw_tag_age_bits;
 949
 950 /*
 951  * Direct-Data Placement page size adjustment
 952  */
 953 static int ddp_adjust_page_table(void)
 954 {
 955         int i;
 956         unsigned int base_order, order;
 957
 958         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
 959                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
 960                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
 961                 return -EINVAL;
 962         }
 963
 964         base_order = get_order(1UL << ddp_page_shift[0]);
 965         order = get_order(1UL << PAGE_SHIFT);
 966
 967         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 968                 /* first is the kernel page size, then just doubling */
 969                 ddp_page_order[i] = order - base_order + i;
 970                 ddp_page_shift[i] = PAGE_SHIFT + i;
 971         }
 972         return 0;
 973 }
 974
 975 static int ddp_find_page_index(unsigned long pgsz)
 976 {
 977         int i;
 978
 979         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 980                 if (pgsz == (1UL << ddp_page_shift[i]))
 981                         return i;
 982         }
 983         pr_info("ddp page size %lu not supported.\n", pgsz);
 984         return DDP_PGIDX_MAX;
 985 }
 986
 987 static void ddp_setup_host_page_size(void)
 988 {
 989         if (page_idx == DDP_PGIDX_MAX) {
 990                 page_idx = ddp_find_page_index(PAGE_SIZE);
 991
 992                 if (page_idx == DDP_PGIDX_MAX) {
 993                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
 994                         if (ddp_adjust_page_table() < 0) {
 995                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
 996                                 return;
 997                         }
 998                         page_idx = ddp_find_page_index(PAGE_SIZE);
 999                 }
1000                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1001         }
1002 }
1003
1004 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1005 {
1006         int i;
1007
1008         for (i = 0; i < DDP_PGIDX_MAX; i++)
1009                 pgsz_factor[i] = ddp_page_order[i];
1010 }
1011 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1012
1013 /*
1014  * DDP setup & teardown
1015  */
1016
1017 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1018                         struct cxgbi_pagepod_hdr *hdr,
1019                         struct cxgbi_gather_list *gl, unsigned int gidx)
1020 {
1021         int i;
1022
1023         memcpy(ppod, hdr, sizeof(*hdr));
1024         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1025                 ppod->addr[i] = gidx < gl->nelem ?
1026                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1027         }
1028 }
1029 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1030
1031 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1032 {
1033         memset(ppod, 0, sizeof(*ppod));
1034 }
1035 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1036
1037 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1038                                         unsigned int start, unsigned int max,
1039                                         unsigned int count,
1040                                         struct cxgbi_gather_list *gl)
1041 {
1042         unsigned int i, j, k;
1043
1044         /*  not enough entries */
1045         if ((max - start) < count) {
1046                 log_debug(1 << CXGBI_DBG_DDP,
1047                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1048                 return -EBUSY;
1049         }
1050
1051         max -= count;
1052         spin_lock(&ddp->map_lock);
1053         for (i = start; i < max;) {
1054                 for (j = 0, k = i; j < count; j++, k++) {
1055                         if (ddp->gl_map[k])
1056                                 break;
1057                 }
1058                 if (j == count) {
1059                         for (j = 0, k = i; j < count; j++, k++)
1060                                 ddp->gl_map[k] = gl;
1061                         spin_unlock(&ddp->map_lock);
1062                         return i;
1063                 }
1064                 i += j + 1;
1065         }
1066         spin_unlock(&ddp->map_lock);
1067         log_debug(1 << CXGBI_DBG_DDP,
1068                 "NO suitable entries %u available.\n", count);
1069         return -EBUSY;
1070 }
1071
1072 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1073                                                 int start, int count)
1074 {
1075         spin_lock(&ddp->map_lock);
1076         memset(&ddp->gl_map[start], 0,
1077                 count * sizeof(struct cxgbi_gather_list *));
1078         spin_unlock(&ddp->map_lock);
1079 }
1080
1081 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1082                                         struct cxgbi_gather_list *gl)
1083 {
1084         int i;
1085
1086         for (i = 0; i < gl->nelem; i++)
1087                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1088                                 PCI_DMA_FROMDEVICE);
1089 }
1090
1091 static inline int ddp_gl_map(struct pci_dev *pdev,
1092                                     struct cxgbi_gather_list *gl)
1093 {
1094         int i;
1095
1096         for (i = 0; i < gl->nelem; i++) {
1097                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1098                                                 PAGE_SIZE,
1099                                                 PCI_DMA_FROMDEVICE);
1100                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1101                         log_debug(1 << CXGBI_DBG_DDP,
1102                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1103                                 i, gl->pages[i], pdev);
1104                         goto unmap;
1105                 }
1106         }
1107         return i;
1108 unmap:
1109         if (i) {
1110                 unsigned int nelem = gl->nelem;
1111
1112                 gl->nelem = i;
1113                 ddp_gl_unmap(pdev, gl);
1114                 gl->nelem = nelem;
1115         }
1116         return -EINVAL;
1117 }
1118
1119 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1120                                   struct pci_dev *pdev)
1121 {
1122         ddp_gl_unmap(pdev, gl);
1123         kfree(gl);
1124 }
1125
1126 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1127                                                     struct scatterlist *sgl,
1128                                                     unsigned int sgcnt,
1129                                                     struct pci_dev *pdev,
1130                                                     gfp_t gfp)
1131 {
1132         struct cxgbi_gather_list *gl;
1133         struct scatterlist *sg = sgl;
1134         struct page *sgpage = sg_page(sg);
1135         unsigned int sglen = sg->length;
1136         unsigned int sgoffset = sg->offset;
1137         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1138                                 PAGE_SHIFT;
1139         int i = 1, j = 0;
1140
1141         if (xferlen < DDP_THRESHOLD) {
1142                 log_debug(1 << CXGBI_DBG_DDP,
1143                         "xfer %u < threshold %u, no ddp.\n",
1144                         xferlen, DDP_THRESHOLD);
1145                 return NULL;
1146         }
1147
1148         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1149                      npages * (sizeof(dma_addr_t) +
1150                      sizeof(struct page *)), gfp);
1151         if (!gl) {
1152                 log_debug(1 << CXGBI_DBG_DDP,
1153                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1154                 return NULL;
1155         }
1156
1157          log_debug(1 << CXGBI_DBG_DDP,
1158                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1159
1160         gl->pages = (struct page **)&gl->phys_addr[npages];
1161         gl->nelem = npages;
1162         gl->length = xferlen;
1163         gl->offset = sgoffset;
1164         gl->pages[0] = sgpage;
1165
1166         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1167                 i++, sg = sg_next(sg)) {
1168                 struct page *page = sg_page(sg);
1169
1170                 if (sgpage == page && sg->offset == sgoffset + sglen)
1171                         sglen += sg->length;
1172                 else {
1173                         /*  make sure the sgl is fit for ddp:
1174                          *  each has the same page size, and
1175                          *  all of the middle pages are used completely
1176                          */
1177                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1178                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1179                                 log_debug(1 << CXGBI_DBG_DDP,
1180                                         "page %d/%u, %u + %u.\n",
1181                                         i, sgcnt, sgoffset, sglen);
1182                                 goto error_out;
1183                         }
1184
1185                         j++;
1186                         if (j == gl->nelem || sg->offset) {
1187                                 log_debug(1 << CXGBI_DBG_DDP,
1188                                         "page %d/%u, offset %u.\n",
1189                                         j, gl->nelem, sg->offset);
1190                                 goto error_out;
1191                         }
1192                         gl->pages[j] = page;
1193                         sglen = sg->length;
1194                         sgoffset = sg->offset;
1195                         sgpage = page;
1196                 }
1197         }
1198         gl->nelem = ++j;
1199
1200         if (ddp_gl_map(pdev, gl) < 0)
1201                 goto error_out;
1202
1203         return gl;
1204
1205 error_out:
1206         kfree(gl);
1207         return NULL;
1208 }
1209
1210 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1211 {
1212         struct cxgbi_device *cdev = chba->cdev;
1213         struct cxgbi_ddp_info *ddp = cdev->ddp;
1214         u32 idx;
1215
1216         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1217         if (idx < ddp->nppods) {
1218                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1219                 unsigned int npods;
1220
1221                 if (!gl || !gl->nelem) {
1222                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1223                                 tag, idx, gl, gl ? gl->nelem : 0);
1224                         return;
1225                 }
1226                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1227                 log_debug(1 << CXGBI_DBG_DDP,
1228                         "tag 0x%x, release idx %u, npods %u.\n",
1229                         tag, idx, npods);
1230                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1231                 ddp_unmark_entries(ddp, idx, npods);
1232                 ddp_release_gl(gl, ddp->pdev);
1233         } else
1234                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1235 }
1236
1237 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1238                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1239                            gfp_t gfp)
1240 {
1241         struct cxgbi_device *cdev = csk->cdev;
1242         struct cxgbi_ddp_info *ddp = cdev->ddp;
1243         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1244         struct cxgbi_pagepod_hdr hdr;
1245         unsigned int npods;
1246         int idx = -1;
1247         int err = -ENOMEM;
1248         u32 tag;
1249
1250         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1251         if (ddp->idx_last == ddp->nppods)
1252                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1253                                                         npods, gl);
1254         else {
1255                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1256                                                         ddp->nppods, npods,
1257                                                         gl);
1258                 if (idx < 0 && ddp->idx_last >= npods) {
1259                         idx = ddp_find_unused_entries(ddp, 0,
1260                                 min(ddp->idx_last + npods, ddp->nppods),
1261                                                         npods, gl);
1262                 }
1263         }
1264         if (idx < 0) {
1265                 log_debug(1 << CXGBI_DBG_DDP,
1266                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1267                         gl->length, gl->nelem, npods);
1268                 return idx;
1269         }
1270
1271         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1272         tag |= idx << PPOD_IDX_SHIFT;
1273
1274         hdr.rsvd = 0;
1275         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1276         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1277         hdr.max_offset = htonl(gl->length);
1278         hdr.page_offset = htonl(gl->offset);
1279
1280         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1281         if (err < 0)
1282                 goto unmark_entries;
1283
1284         ddp->idx_last = idx;
1285         log_debug(1 << CXGBI_DBG_DDP,
1286                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1287                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1288                 npods);
1289         *tagp = tag;
1290         return 0;
1291
1292 unmark_entries:
1293         ddp_unmark_entries(ddp, idx, npods);
1294         return err;
1295 }
1296
1297 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1298                         unsigned int sw_tag, unsigned int xferlen,
1299                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1300 {
1301         struct cxgbi_device *cdev = csk->cdev;
1302         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1303         struct cxgbi_gather_list *gl;
1304         int err;
1305
1306         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1307             xferlen < DDP_THRESHOLD) {
1308                 log_debug(1 << CXGBI_DBG_DDP,
1309                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1310                 return -EINVAL;
1311         }
1312
1313         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1314                 log_debug(1 << CXGBI_DBG_DDP,
1315                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1316                 return -EINVAL;
1317         }
1318
1319         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1320         if (!gl)
1321                 return -ENOMEM;
1322
1323         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1324         if (err < 0)
1325                 ddp_release_gl(gl, cdev->pdev);
1326
1327         return err;
1328 }
1329
1330 static void ddp_destroy(struct kref *kref)
1331 {
1332         struct cxgbi_ddp_info *ddp = container_of(kref,
1333                                                 struct cxgbi_ddp_info,
1334                                                 refcnt);
1335         struct cxgbi_device *cdev = ddp->cdev;
1336         int i = 0;
1337
1338         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1339
1340         while (i < ddp->nppods) {
1341                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1342
1343                 if (gl) {
1344                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1345                                         >> PPOD_PAGES_SHIFT;
1346                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1347                         kfree(gl);
1348                         i += npods;
1349                 } else
1350                         i++;
1351         }
1352         cxgbi_free_big_mem(ddp);
1353 }
1354
1355 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1356 {
1357         struct cxgbi_ddp_info *ddp = cdev->ddp;
1358
1359         log_debug(1 << CXGBI_DBG_DDP,
1360                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1361         cdev->ddp = NULL;
1362         if (ddp)
1363                 return kref_put(&ddp->refcnt, ddp_destroy);
1364         return 0;
1365 }
1366 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1367
1368 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1369                    unsigned int llimit, unsigned int ulimit,
1370                    unsigned int max_txsz, unsigned int max_rxsz)
1371 {
1372         struct cxgbi_ddp_info *ddp;
1373         unsigned int ppmax, bits;
1374
1375         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1376         bits = __ilog2_u32(ppmax) + 1;
1377         if (bits > PPOD_IDX_MAX_SIZE)
1378                 bits = PPOD_IDX_MAX_SIZE;
1379         ppmax = (1 << (bits - 1)) - 1;
1380
1381         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1382                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1383                                          sizeof(struct sk_buff *)),
1384                                 GFP_KERNEL);
1385         if (!ddp) {
1386                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1387                 return -ENOMEM;
1388         }
1389         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1390         cdev->ddp = ddp;
1391
1392         spin_lock_init(&ddp->map_lock);
1393         kref_init(&ddp->refcnt);
1394
1395         ddp->cdev = cdev;
1396         ddp->pdev = cdev->pdev;
1397         ddp->llimit = llimit;
1398         ddp->ulimit = ulimit;
1399         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1400         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1401         ddp->nppods = ppmax;
1402         ddp->idx_last = ppmax;
1403         ddp->idx_bits = bits;
1404         ddp->idx_mask = (1 << bits) - 1;
1405         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1406
1407         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1408         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1409         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1410         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1411
1412         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1413                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1414                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1415                 cdev->tag_format.rsvd_mask);
1416
1417         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1418                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1419         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1420                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1421
1422         log_debug(1 << CXGBI_DBG_DDP,
1423                 "%s max payload size: %u/%u, %u/%u.\n",
1424                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1425                 cdev->rx_max_size, ddp->max_rxsz);
1426         return 0;
1427 }
1428 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1429
1430 /*
1431  * APIs interacting with open-iscsi libraries
1432  */
1433
1434 static unsigned char padding[4];
1435
1436 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1437 {
1438         struct scsi_cmnd *sc = task->sc;
1439         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1440         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1441         struct cxgbi_hba *chba = cconn->chba;
1442         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1443         u32 tag = ntohl((__force u32)hdr_itt);
1444
1445         log_debug(1 << CXGBI_DBG_DDP,
1446                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1447         if (sc &&
1448             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1449             cxgbi_is_ddp_tag(tformat, tag))
1450                 ddp_tag_release(chba, tag);
1451 }
1452
1453 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1454 {
1455         struct scsi_cmnd *sc = task->sc;
1456         struct iscsi_conn *conn = task->conn;
1457         struct iscsi_session *sess = conn->session;
1458         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1459         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1460         struct cxgbi_hba *chba = cconn->chba;
1461         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1462         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1463         u32 tag = 0;
1464         int err = -EINVAL;
1465
1466         if (sc &&
1467             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1468                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1469                                         scsi_in(sc)->length,
1470                                         scsi_in(sc)->table.sgl,
1471                                         scsi_in(sc)->table.nents,
1472                                         GFP_ATOMIC);
1473                 if (err < 0)
1474                         log_debug(1 << CXGBI_DBG_DDP,
1475                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1476                                 cconn->cep->csk, task, scsi_in(sc)->length,
1477                                 scsi_in(sc)->table.nents);
1478         }
1479
1480         if (err < 0)
1481                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1482         /*  the itt need to sent in big-endian order */
1483         *hdr_itt = (__force itt_t)htonl(tag);
1484
1485         log_debug(1 << CXGBI_DBG_DDP,
1486                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1487                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1488         return 0;
1489 }
1490
1491 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1492 {
1493         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1494         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1495         struct cxgbi_device *cdev = cconn->chba->cdev;
1496         u32 tag = ntohl((__force u32) itt);
1497         u32 sw_bits;
1498
1499         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1500         if (idx)
1501                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1502         if (age)
1503                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1504
1505         log_debug(1 << CXGBI_DBG_DDP,
1506                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1507                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1508                 age ? *age : 0xFF);
1509 }
1510 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1511
1512 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1513 {
1514         struct iscsi_conn *conn = csk->user_data;
1515
1516         if (conn) {
1517                 log_debug(1 << CXGBI_DBG_SOCK,
1518                         "csk 0x%p, cid %d.\n", csk, conn->id);
1519                 iscsi_conn_queue_work(conn);
1520         }
1521 }
1522 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1523
1524 /*
1525  * pdu receive, interact with libiscsi_tcp
1526  */
1527 static inline int read_pdu_skb(struct iscsi_conn *conn,
1528                                struct sk_buff *skb,
1529                                unsigned int offset,
1530                                int offloaded)
1531 {
1532         int status = 0;
1533         int bytes_read;
1534
1535         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1536         switch (status) {
1537         case ISCSI_TCP_CONN_ERR:
1538                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1539                           skb, offset, offloaded);
1540                 return -EIO;
1541         case ISCSI_TCP_SUSPENDED:
1542                 log_debug(1 << CXGBI_DBG_PDU_RX,
1543                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1544                         skb, offset, offloaded, bytes_read);
1545                 /* no transfer - just have caller flush queue */
1546                 return bytes_read;
1547         case ISCSI_TCP_SKB_DONE:
1548                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1549                         skb, offset, offloaded);
1550                 /*
1551                  * pdus should always fit in the skb and we should get
1552                  * segment done notifcation.
1553                  */
1554                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1555                 return -EFAULT;
1556         case ISCSI_TCP_SEGMENT_DONE:
1557                 log_debug(1 << CXGBI_DBG_PDU_RX,
1558                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1559                         skb, offset, offloaded, bytes_read);
1560                 return bytes_read;
1561         default:
1562                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1563                         skb, offset, offloaded, status);
1564                 return -EINVAL;
1565         }
1566 }
1567
1568 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1569 {
1570         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1571
1572         log_debug(1 << CXGBI_DBG_PDU_RX,
1573                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1574                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1575
1576         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1577                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1578                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1579                 return -EIO;
1580         }
1581
1582         if (conn->hdrdgst_en &&
1583             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1584                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1585                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1586                 return -EIO;
1587         }
1588
1589         return read_pdu_skb(conn, skb, 0, 0);
1590 }
1591
1592 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1593                              struct sk_buff *skb, unsigned int offset)
1594 {
1595         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1596         bool offloaded = 0;
1597         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1598
1599         log_debug(1 << CXGBI_DBG_PDU_RX,
1600                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1601                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1602
1603         if (conn->datadgst_en &&
1604             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1605                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1606                         conn, lskb, cxgbi_skcb_flags(lskb));
1607                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1608                 return -EIO;
1609         }
1610
1611         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1612                 return 0;
1613
1614         /* coalesced, add header digest length */
1615         if (lskb == skb && conn->hdrdgst_en)
1616                 offset += ISCSI_DIGEST_SIZE;
1617
1618         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1619                 offloaded = 1;
1620
1621         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1622                 log_debug(1 << CXGBI_DBG_PDU_RX,
1623                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1624                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1625                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1626
1627         return read_pdu_skb(conn, skb, offset, offloaded);
1628 }
1629
1630 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1631 {
1632         struct cxgbi_device *cdev = csk->cdev;
1633         int must_send;
1634         u32 credits;
1635
1636         log_debug(1 << CXGBI_DBG_PDU_RX,
1637                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1638                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1639                 csk->rcv_wup, cdev->rx_credit_thres,
1640                 cdev->rcv_win);
1641
1642         if (csk->state != CTP_ESTABLISHED)
1643                 return;
1644
1645         credits = csk->copied_seq - csk->rcv_wup;
1646         if (unlikely(!credits))
1647                 return;
1648         if (unlikely(cdev->rx_credit_thres == 0))
1649                 return;
1650
1651         must_send = credits + 16384 >= cdev->rcv_win;
1652         if (must_send || credits >= cdev->rx_credit_thres)
1653                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1654 }
1655
1656 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1657 {
1658         struct cxgbi_device *cdev = csk->cdev;
1659         struct iscsi_conn *conn = csk->user_data;
1660         struct sk_buff *skb;
1661         unsigned int read = 0;
1662         int err = 0;
1663
1664         log_debug(1 << CXGBI_DBG_PDU_RX,
1665                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1666
1667         if (unlikely(!conn || conn->suspend_rx)) {
1668                 log_debug(1 << CXGBI_DBG_PDU_RX,
1669                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1670                         csk, conn, conn ? conn->id : 0xFF,
1671                         conn ? conn->suspend_rx : 0xFF);
1672                 return;
1673         }
1674
1675         while (!err) {
1676                 skb = skb_peek(&csk->receive_queue);
1677                 if (!skb ||
1678                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1679                         if (skb)
1680                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1681                                         "skb 0x%p, NOT ready 0x%lx.\n",
1682                                         skb, cxgbi_skcb_flags(skb));
1683                         break;
1684                 }
1685                 __skb_unlink(skb, &csk->receive_queue);
1686
1687                 read += cxgbi_skcb_rx_pdulen(skb);
1688                 log_debug(1 << CXGBI_DBG_PDU_RX,
1689                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1690                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1691                         cxgbi_skcb_rx_pdulen(skb));
1692
1693                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1694                         err = skb_read_pdu_bhs(conn, skb);
1695                         if (err < 0) {
1696                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1697                                         "f 0x%lx, plen %u.\n",
1698                                         csk, skb, skb->len,
1699                                         cxgbi_skcb_flags(skb),
1700                                         cxgbi_skcb_rx_pdulen(skb));
1701                                 goto skb_done;
1702                         }
1703                         err = skb_read_pdu_data(conn, skb, skb,
1704                                                 err + cdev->skb_rx_extra);
1705                         if (err < 0)
1706                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1707                                         "f 0x%lx, plen %u.\n",
1708                                         csk, skb, skb->len,
1709                                         cxgbi_skcb_flags(skb),
1710                                         cxgbi_skcb_rx_pdulen(skb));
1711                 } else {
1712                         err = skb_read_pdu_bhs(conn, skb);
1713                         if (err < 0) {
1714                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1715                                         "f 0x%lx, plen %u.\n",
1716                                         csk, skb, skb->len,
1717                                         cxgbi_skcb_flags(skb),
1718                                         cxgbi_skcb_rx_pdulen(skb));
1719                                 goto skb_done;
1720                         }
1721
1722                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1723                                 struct sk_buff *dskb;
1724
1725                                 dskb = skb_peek(&csk->receive_queue);
1726                                 if (!dskb) {
1727                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1728                                                 " plen %u, NO data.\n",
1729                                                 csk, skb, skb->len,
1730                                                 cxgbi_skcb_flags(skb),
1731                                                 cxgbi_skcb_rx_pdulen(skb));
1732                                         err = -EIO;
1733                                         goto skb_done;
1734                                 }
1735                                 __skb_unlink(dskb, &csk->receive_queue);
1736
1737                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1738                                 if (err < 0)
1739                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1740                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1741                                                 "%u.\n",
1742                                                 csk, skb, skb->len,
1743                                                 cxgbi_skcb_flags(skb),
1744                                                 cxgbi_skcb_rx_pdulen(skb),
1745                                                 dskb, dskb->len);
1746                                 __kfree_skb(dskb);
1747                         } else
1748                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1749                 }
1750 skb_done:
1751                 __kfree_skb(skb);
1752
1753                 if (err < 0)
1754                         break;
1755         }
1756
1757         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1758         if (read) {
1759                 csk->copied_seq += read;
1760                 csk_return_rx_credits(csk, read);
1761                 conn->rxdata_octets += read;
1762         }
1763
1764         if (err < 0) {
1765                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1766                         csk, conn, err, read);
1767                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1768         }
1769 }
1770 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1771
1772 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1773                                 unsigned int offset, unsigned int *off,
1774                                 struct scatterlist **sgp)
1775 {
1776         int i;
1777         struct scatterlist *sg;
1778
1779         for_each_sg(sgl, sg, sgcnt, i) {
1780                 if (offset < sg->length) {
1781                         *off = offset;
1782                         *sgp = sg;
1783                         return 0;
1784                 }
1785                 offset -= sg->length;
1786         }
1787         return -EFAULT;
1788 }
1789
1790 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1791                                 unsigned int dlen, struct page_frag *frags,
1792                                 int frag_max)
1793 {
1794         unsigned int datalen = dlen;
1795         unsigned int sglen = sg->length - sgoffset;
1796         struct page *page = sg_page(sg);
1797         int i;
1798
1799         i = 0;
1800         do {
1801                 unsigned int copy;
1802
1803                 if (!sglen) {
1804                         sg = sg_next(sg);
1805                         if (!sg) {
1806                                 pr_warn("sg %d NULL, len %u/%u.\n",
1807                                         i, datalen, dlen);
1808                                 return -EINVAL;
1809                         }
1810                         sgoffset = 0;
1811                         sglen = sg->length;
1812                         page = sg_page(sg);
1813
1814                 }
1815                 copy = min(datalen, sglen);
1816                 if (i && page == frags[i - 1].page &&
1817                     sgoffset + sg->offset ==
1818                         frags[i - 1].offset + frags[i - 1].size) {
1819                         frags[i - 1].size += copy;
1820                 } else {
1821                         if (i >= frag_max) {
1822                                 pr_warn("too many pages %u, dlen %u.\n",
1823                                         frag_max, dlen);
1824                                 return -EINVAL;
1825                         }
1826
1827                         frags[i].page = page;
1828                         frags[i].offset = sg->offset + sgoffset;
1829                         frags[i].size = copy;
1830                         i++;
1831                 }
1832                 datalen -= copy;
1833                 sgoffset += copy;
1834                 sglen -= copy;
1835         } while (datalen);
1836
1837         return i;
1838 }
1839
1840 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1841 {
1842         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1843         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1844         struct cxgbi_device *cdev = cconn->chba->cdev;
1845         struct iscsi_conn *conn = task->conn;
1846         struct iscsi_tcp_task *tcp_task = task->dd_data;
1847         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1848         struct scsi_cmnd *sc = task->sc;
1849         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1850
1851         tcp_task->dd_data = tdata;
1852         task->hdr = NULL;
1853
1854         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1855             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1856              (opcode == ISCSI_OP_SCSI_CMD &&
1857               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1858                 /* data could goes into skb head */
1859                 headroom += min_t(unsigned int,
1860                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1861                                 conn->max_xmit_dlength);
1862
1863         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1864         if (!tdata->skb) {
1865                 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1866                         cdev->skb_tx_rsvd, headroom, opcode);
1867                 return -ENOMEM;
1868         }
1869
1870         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1871         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1872         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1873
1874         /* data_out uses scsi_cmd's itt */
1875         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1876                 task_reserve_itt(task, &task->hdr->itt);
1877
1878         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1879                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1880                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1881                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1882
1883         return 0;
1884 }
1885 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1886
1887 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1888 {
1889         if (hcrc || dcrc) {
1890                 u8 submode = 0;
1891
1892                 if (hcrc)
1893                         submode |= 1;
1894                 if (dcrc)
1895                         submode |= 2;
1896                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1897         } else
1898                 cxgbi_skcb_ulp_mode(skb) = 0;
1899 }
1900
1901 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1902                               unsigned int count)
1903 {
1904         struct iscsi_conn *conn = task->conn;
1905         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1906         struct sk_buff *skb = tdata->skb;
1907         unsigned int datalen = count;
1908         int i, padlen = iscsi_padding(count);
1909         struct page *pg;
1910
1911         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1912                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1913                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1914                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1915
1916         skb_put(skb, task->hdr_len);
1917         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1918         if (!count)
1919                 return 0;
1920
1921         if (task->sc) {
1922                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1923                 struct scatterlist *sg = NULL;
1924                 int err;
1925
1926                 tdata->offset = offset;
1927                 tdata->count = count;
1928                 err = sgl_seek_offset(
1929                                         sdb->table.sgl, sdb->table.nents,
1930                                         tdata->offset, &tdata->sgoffset, &sg);
1931                 if (err < 0) {
1932                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1933                                 sdb->table.nents, tdata->offset, sdb->length);
1934                         return err;
1935                 }
1936                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1937                                         tdata->frags, MAX_PDU_FRAGS);
1938                 if (err < 0) {
1939                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1940                                 sdb->table.nents, tdata->offset, tdata->count);
1941                         return err;
1942                 }
1943                 tdata->nr_frags = err;
1944
1945                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1946                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1947                         char *dst = skb->data + task->hdr_len;
1948                         struct page_frag *frag = tdata->frags;
1949
1950                         /* data fits in the skb's headroom */
1951                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1952                                 char *src = kmap_atomic(frag->page,
1953                                                         KM_SOFTIRQ0);
1954
1955                                 memcpy(dst, src+frag->offset, frag->size);
1956                                 dst += frag->size;
1957                                 kunmap_atomic(src, KM_SOFTIRQ0);
1958                         }
1959                         if (padlen) {
1960                                 memset(dst, 0, padlen);
1961                                 padlen = 0;
1962                         }
1963                         skb_put(skb, count + padlen);
1964                 } else {
1965                         /* data fit into frag_list */
1966                         for (i = 0; i < tdata->nr_frags; i++) {
1967                                 __skb_fill_page_desc(skb, i,
1968                                                 tdata->frags[i].page,
1969                                                 tdata->frags[i].offset,
1970                                                 tdata->frags[i].size);
1971                                 skb_frag_ref(skb, i);
1972                         }
1973                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1974                         skb->len += count;
1975                         skb->data_len += count;
1976                         skb->truesize += count;
1977                 }
1978
1979         } else {
1980                 pg = virt_to_page(task->data);
1981
1982                 get_page(pg);
1983                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1984                                         count);
1985                 skb->len += count;
1986                 skb->data_len += count;
1987                 skb->truesize += count;
1988         }
1989
1990         if (padlen) {
1991                 i = skb_shinfo(skb)->nr_frags;
1992                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1993                                 virt_to_page(padding), offset_in_page(padding),
1994                                 padlen);
1995
1996                 skb->data_len += padlen;
1997                 skb->truesize += padlen;
1998                 skb->len += padlen;
1999         }
2000
2001         return 0;
2002 }
2003 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2004
2005 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2006 {
2007         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2008         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2009         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2010         struct sk_buff *skb = tdata->skb;
2011         unsigned int datalen;
2012         int err;
2013
2014         if (!skb) {
2015                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2016                         "task 0x%p, skb NULL.\n", task);
2017                 return 0;
2018         }
2019
2020         datalen = skb->data_len;
2021         tdata->skb = NULL;
2022         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2023         if (err > 0) {
2024                 int pdulen = err;
2025
2026                 log_debug(1 << CXGBI_DBG_PDU_TX,
2027                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2028                         task, task->sc, skb, skb->len, skb->data_len, err);
2029
2030                 if (task->conn->hdrdgst_en)
2031                         pdulen += ISCSI_DIGEST_SIZE;
2032
2033                 if (datalen && task->conn->datadgst_en)
2034                         pdulen += ISCSI_DIGEST_SIZE;
2035
2036                 task->conn->txdata_octets += pdulen;
2037                 return 0;
2038         }
2039
2040         if (err == -EAGAIN || err == -ENOBUFS) {
2041                 log_debug(1 << CXGBI_DBG_PDU_TX,
2042                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2043                         task, skb, skb->len, skb->data_len, err);
2044                 /* reset skb to send when we are called again */
2045                 tdata->skb = skb;
2046                 return err;
2047         }
2048
2049         kfree_skb(skb);
2050         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2051                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2052                 task->itt, skb, skb->len, skb->data_len, err);
2053         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2054         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2055         return err;
2056 }
2057 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2058
2059 void cxgbi_cleanup_task(struct iscsi_task *task)
2060 {
2061         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2062
2063         log_debug(1 << CXGBI_DBG_ISCSI,
2064                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2065                 task, tdata->skb, task->hdr_itt);
2066
2067         /*  never reached the xmit task callout */
2068         if (tdata->skb)
2069                 __kfree_skb(tdata->skb);
2070         memset(tdata, 0, sizeof(*tdata));
2071
2072         task_release_itt(task, task->hdr_itt);
2073         iscsi_tcp_cleanup_task(task);
2074 }
2075 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2076
2077 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2078                                 struct iscsi_stats *stats)
2079 {
2080         struct iscsi_conn *conn = cls_conn->dd_data;
2081
2082         stats->txdata_octets = conn->txdata_octets;
2083         stats->rxdata_octets = conn->rxdata_octets;
2084         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2085         stats->dataout_pdus = conn->dataout_pdus_cnt;
2086         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2087         stats->datain_pdus = conn->datain_pdus_cnt;
2088         stats->r2t_pdus = conn->r2t_pdus_cnt;
2089         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2090         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2091         stats->digest_err = 0;
2092         stats->timeout_err = 0;
2093         stats->custom_length = 1;
2094         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2095         stats->custom[0].value = conn->eh_abort_cnt;
2096 }
2097 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2098
2099 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2100 {
2101         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2102         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2103         struct cxgbi_device *cdev = cconn->chba->cdev;
2104         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2105         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2106         unsigned int max = max(max_def, headroom);
2107
2108         max = min(cconn->chba->cdev->tx_max_size, max);
2109         if (conn->max_xmit_dlength)
2110                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2111         else
2112                 conn->max_xmit_dlength = max;
2113         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2114
2115         return 0;
2116 }
2117
2118 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2119 {
2120         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2121         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2122         unsigned int max = cconn->chba->cdev->rx_max_size;
2123
2124         cxgbi_align_pdu_size(max);
2125
2126         if (conn->max_recv_dlength) {
2127                 if (conn->max_recv_dlength > max) {
2128                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2129                                 conn->max_recv_dlength, max);
2130                         return -EINVAL;
2131                 }
2132                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2133                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2134         } else
2135                 conn->max_recv_dlength = max;
2136
2137         return 0;
2138 }
2139
2140 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2141                         enum iscsi_param param, char *buf, int buflen)
2142 {
2143         struct iscsi_conn *conn = cls_conn->dd_data;
2144         struct iscsi_session *session = conn->session;
2145         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2146         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2147         struct cxgbi_sock *csk = cconn->cep->csk;
2148         int value, err = 0;
2149
2150         log_debug(1 << CXGBI_DBG_ISCSI,
2151                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2152                 cls_conn, param, buflen, buf);
2153
2154         switch (param) {
2155         case ISCSI_PARAM_HDRDGST_EN:
2156                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2157                 if (!err && conn->hdrdgst_en)
2158                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2159                                                         conn->hdrdgst_en,
2160                                                         conn->datadgst_en, 0);
2161                 break;
2162         case ISCSI_PARAM_DATADGST_EN:
2163                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2164                 if (!err && conn->datadgst_en)
2165                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2166                                                         conn->hdrdgst_en,
2167                                                         conn->datadgst_en, 0);
2168                 break;
2169         case ISCSI_PARAM_MAX_R2T:
2170                 sscanf(buf, "%d", &value);
2171                 if (value <= 0 || !is_power_of_2(value))
2172                         return -EINVAL;
2173                 if (session->max_r2t == value)
2174                         break;
2175                 iscsi_tcp_r2tpool_free(session);
2176                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2177                 if (!err && iscsi_tcp_r2tpool_alloc(session))
2178                         return -ENOMEM;
2179         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2180                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181                 if (!err)
2182                         err = cxgbi_conn_max_recv_dlength(conn);
2183                 break;
2184         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2185                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2186                 if (!err)
2187                         err = cxgbi_conn_max_xmit_dlength(conn);
2188                 break;
2189         default:
2190                 return iscsi_set_param(cls_conn, param, buf, buflen);
2191         }
2192         return err;
2193 }
2194 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2195
2196 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2197                        char *buf)
2198 {
2199         struct cxgbi_endpoint *cep = ep->dd_data;
2200         struct cxgbi_sock *csk;
2201         int len;
2202
2203         log_debug(1 << CXGBI_DBG_ISCSI,
2204                 "cls_conn 0x%p, param %d.\n", ep, param);
2205
2206         switch (param) {
2207         case ISCSI_PARAM_CONN_PORT:
2208         case ISCSI_PARAM_CONN_ADDRESS:
2209                 if (!cep)
2210                         return -ENOTCONN;
2211
2212                 csk = cep->csk;
2213                 if (!csk)
2214                         return -ENOTCONN;
2215
2216                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2217                                                  &csk->daddr, param, buf);
2218         default:
2219                 return -ENOSYS;
2220         }
2221         return len;
2222 }
2223 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2224
2225 struct iscsi_cls_conn *
2226 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2227 {
2228         struct iscsi_cls_conn *cls_conn;
2229         struct iscsi_conn *conn;
2230         struct iscsi_tcp_conn *tcp_conn;
2231         struct cxgbi_conn *cconn;
2232
2233         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2234         if (!cls_conn)
2235                 return NULL;
2236
2237         conn = cls_conn->dd_data;
2238         tcp_conn = conn->dd_data;
2239         cconn = tcp_conn->dd_data;
2240         cconn->iconn = conn;
2241
2242         log_debug(1 << CXGBI_DBG_ISCSI,
2243                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2244                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2245
2246         return cls_conn;
2247 }
2248 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2249
2250 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2251                                 struct iscsi_cls_conn *cls_conn,
2252                                 u64 transport_eph, int is_leading)
2253 {
2254         struct iscsi_conn *conn = cls_conn->dd_data;
2255         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2256         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2257         struct iscsi_endpoint *ep;
2258         struct cxgbi_endpoint *cep;
2259         struct cxgbi_sock *csk;
2260         int err;
2261
2262         ep = iscsi_lookup_endpoint(transport_eph);
2263         if (!ep)
2264                 return -EINVAL;
2265
2266         /*  setup ddp pagesize */
2267         cep = ep->dd_data;
2268         csk = cep->csk;
2269         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2270         if (err < 0)
2271                 return err;
2272
2273         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2274         if (err)
2275                 return -EINVAL;
2276
2277         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2278         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2279
2280         write_lock_bh(&csk->callback_lock);
2281         csk->user_data = conn;
2282         cconn->chba = cep->chba;
2283         cconn->cep = cep;
2284         cep->cconn = cconn;
2285         write_unlock_bh(&csk->callback_lock);
2286
2287         cxgbi_conn_max_xmit_dlength(conn);
2288         cxgbi_conn_max_recv_dlength(conn);
2289
2290         log_debug(1 << CXGBI_DBG_ISCSI,
2291                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2292                 cls_session, cls_conn, ep, cconn, csk);
2293         /*  init recv engine */
2294         iscsi_tcp_hdr_recv_prep(tcp_conn);
2295
2296         return 0;
2297 }
2298 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2299
2300 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2301                                                 u16 cmds_max, u16 qdepth,
2302                                                 u32 initial_cmdsn)
2303 {
2304         struct cxgbi_endpoint *cep;
2305         struct cxgbi_hba *chba;
2306         struct Scsi_Host *shost;
2307         struct iscsi_cls_session *cls_session;
2308         struct iscsi_session *session;
2309
2310         if (!ep) {
2311                 pr_err("missing endpoint.\n");
2312                 return NULL;
2313         }
2314
2315         cep = ep->dd_data;
2316         chba = cep->chba;
2317         shost = chba->shost;
2318
2319         BUG_ON(chba != iscsi_host_priv(shost));
2320
2321         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2322                                         cmds_max, 0,
2323                                         sizeof(struct iscsi_tcp_task) +
2324                                         sizeof(struct cxgbi_task_data),
2325                                         initial_cmdsn, ISCSI_MAX_TARGET);
2326         if (!cls_session)
2327                 return NULL;
2328
2329         session = cls_session->dd_data;
2330         if (iscsi_tcp_r2tpool_alloc(session))
2331                 goto remove_session;
2332
2333         log_debug(1 << CXGBI_DBG_ISCSI,
2334                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2335         return cls_session;
2336
2337 remove_session:
2338         iscsi_session_teardown(cls_session);
2339         return NULL;
2340 }
2341 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2342
2343 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2344 {
2345         log_debug(1 << CXGBI_DBG_ISCSI,
2346                 "cls sess 0x%p.\n", cls_session);
2347
2348         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2349         iscsi_session_teardown(cls_session);
2350 }
2351 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2352
2353 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2354                         char *buf, int buflen)
2355 {
2356         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2357
2358         if (!chba->ndev) {
2359                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2360                                 "netdev for host not set.\n");
2361                 return -ENODEV;
2362         }
2363
2364         log_debug(1 << CXGBI_DBG_ISCSI,
2365                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2366                 shost, chba, chba->ndev->name, param, buflen, buf);
2367
2368         switch (param) {
2369         case ISCSI_HOST_PARAM_IPADDRESS:
2370         {
2371                 __be32 addr = in_aton(buf);
2372                 log_debug(1 << CXGBI_DBG_ISCSI,
2373                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2374                 cxgbi_set_iscsi_ipv4(chba, addr);
2375                 return 0;
2376         }
2377         case ISCSI_HOST_PARAM_HWADDRESS:
2378         case ISCSI_HOST_PARAM_NETDEV_NAME:
2379                 return 0;
2380         default:
2381                 return iscsi_host_set_param(shost, param, buf, buflen);
2382         }
2383 }
2384 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2385
2386 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2387                         char *buf)
2388 {
2389         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2390         int len = 0;
2391
2392         if (!chba->ndev) {
2393                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2394                                 "netdev for host not set.\n");
2395                 return -ENODEV;
2396         }
2397
2398         log_debug(1 << CXGBI_DBG_ISCSI,
2399                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2400                 shost, chba, chba->ndev->name, param);
2401
2402         switch (param) {
2403         case ISCSI_HOST_PARAM_HWADDRESS:
2404                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2405                 break;
2406         case ISCSI_HOST_PARAM_NETDEV_NAME:
2407                 len = sprintf(buf, "%s\n", chba->ndev->name);
2408                 break;
2409         case ISCSI_HOST_PARAM_IPADDRESS:
2410         {
2411                 __be32 addr;
2412
2413                 addr = cxgbi_get_iscsi_ipv4(chba);
2414                 len = sprintf(buf, "%pI4", &addr);
2415                 log_debug(1 << CXGBI_DBG_ISCSI,
2416                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2417                 break;
2418         }
2419         default:
2420                 return iscsi_host_get_param(shost, param, buf);
2421         }
2422
2423         return len;
2424 }
2425 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2426
2427 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2428                                         struct sockaddr *dst_addr,
2429                                         int non_blocking)
2430 {
2431         struct iscsi_endpoint *ep;
2432         struct cxgbi_endpoint *cep;
2433         struct cxgbi_hba *hba = NULL;
2434         struct cxgbi_sock *csk;
2435         int err = -EINVAL;
2436
2437         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2438                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2439                 shost, non_blocking, dst_addr);
2440
2441         if (shost) {
2442                 hba = iscsi_host_priv(shost);
2443                 if (!hba) {
2444                         pr_info("shost 0x%p, priv NULL.\n", shost);
2445                         goto err_out;
2446                 }
2447         }
2448
2449         csk = cxgbi_check_route(dst_addr);
2450         if (IS_ERR(csk))
2451                 return (struct iscsi_endpoint *)csk;
2452         cxgbi_sock_get(csk);
2453
2454         if (!hba)
2455                 hba = csk->cdev->hbas[csk->port_id];
2456         else if (hba != csk->cdev->hbas[csk->port_id]) {
2457                 pr_info("Could not connect through requested host %u"
2458                         "hba 0x%p != 0x%p (%u).\n",
2459                         shost->host_no, hba,
2460                         csk->cdev->hbas[csk->port_id], csk->port_id);
2461                 err = -ENOSPC;
2462                 goto release_conn;
2463         }
2464
2465         err = sock_get_port(csk);
2466         if (err)
2467                 goto release_conn;
2468
2469         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2470         err = csk->cdev->csk_init_act_open(csk);
2471         if (err)
2472                 goto release_conn;
2473
2474         if (cxgbi_sock_is_closing(csk)) {
2475                 err = -ENOSPC;
2476                 pr_info("csk 0x%p is closing.\n", csk);
2477                 goto release_conn;
2478         }
2479
2480         ep = iscsi_create_endpoint(sizeof(*cep));
2481         if (!ep) {
2482                 err = -ENOMEM;
2483                 pr_info("iscsi alloc ep, OOM.\n");
2484                 goto release_conn;
2485         }
2486
2487         cep = ep->dd_data;
2488         cep->csk = csk;
2489         cep->chba = hba;
2490
2491         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2492                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2493                 ep, cep, csk, hba, hba->ndev->name);
2494         return ep;
2495
2496 release_conn:
2497         cxgbi_sock_put(csk);
2498         cxgbi_sock_closed(csk);
2499 err_out:
2500         return ERR_PTR(err);
2501 }
2502 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2503
2504 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2505 {
2506         struct cxgbi_endpoint *cep = ep->dd_data;
2507         struct cxgbi_sock *csk = cep->csk;
2508
2509         if (!cxgbi_sock_is_established(csk))
2510                 return 0;
2511         return 1;
2512 }
2513 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2514
2515 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2516 {
2517         struct cxgbi_endpoint *cep = ep->dd_data;
2518         struct cxgbi_conn *cconn = cep->cconn;
2519         struct cxgbi_sock *csk = cep->csk;
2520
2521         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2522                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2523                 ep, cep, cconn, csk, csk->state, csk->flags);
2524
2525         if (cconn && cconn->iconn) {
2526                 iscsi_suspend_tx(cconn->iconn);
2527                 write_lock_bh(&csk->callback_lock);
2528                 cep->csk->user_data = NULL;
2529                 cconn->cep = NULL;
2530                 write_unlock_bh(&csk->callback_lock);
2531         }
2532         iscsi_destroy_endpoint(ep);
2533
2534         if (likely(csk->state >= CTP_ESTABLISHED))
2535                 need_active_close(csk);
2536         else
2537                 cxgbi_sock_closed(csk);
2538
2539         cxgbi_sock_put(csk);
2540 }
2541 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2542
2543 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2544                         struct scsi_transport_template **stt)
2545 {
2546         *stt = iscsi_register_transport(itp);
2547         if (*stt == NULL) {
2548                 pr_err("unable to register %s transport 0x%p.\n",
2549                         itp->name, itp);
2550                 return -ENODEV;
2551         }
2552         log_debug(1 << CXGBI_DBG_ISCSI,
2553                 "%s, registered iscsi transport 0x%p.\n",
2554                 itp->name, stt);
2555         return 0;
2556 }
2557 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2558
2559 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2560                         struct scsi_transport_template **stt)
2561 {
2562         if (*stt) {
2563                 log_debug(1 << CXGBI_DBG_ISCSI,
2564                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2565                         itp, itp->name, *stt);
2566                 *stt = NULL;
2567                 iscsi_unregister_transport(itp);
2568         }
2569 }
2570 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2571
2572 mode_t cxgbi_attr_is_visible(int param_type, int param)
2573 {
2574         switch (param_type) {
2575         case ISCSI_HOST_PARAM:
2576                 switch (param) {
2577                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2578                 case ISCSI_HOST_PARAM_HWADDRESS:
2579                 case ISCSI_HOST_PARAM_IPADDRESS:
2580                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2581                         return S_IRUGO;
2582                 default:
2583                         return 0;
2584                 }
2585         case ISCSI_PARAM:
2586                 switch (param) {
2587                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2588                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2589                 case ISCSI_PARAM_HDRDGST_EN:
2590                 case ISCSI_PARAM_DATADGST_EN:
2591                 case ISCSI_PARAM_CONN_ADDRESS:
2592                 case ISCSI_PARAM_CONN_PORT:
2593                 case ISCSI_PARAM_EXP_STATSN:
2594                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2595                 case ISCSI_PARAM_PERSISTENT_PORT:
2596                 case ISCSI_PARAM_PING_TMO:
2597                 case ISCSI_PARAM_RECV_TMO:
2598                 case ISCSI_PARAM_INITIAL_R2T_EN:
2599                 case ISCSI_PARAM_MAX_R2T:
2600                 case ISCSI_PARAM_IMM_DATA_EN:
2601                 case ISCSI_PARAM_FIRST_BURST:
2602                 case ISCSI_PARAM_MAX_BURST:
2603                 case ISCSI_PARAM_PDU_INORDER_EN:
2604                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2605                 case ISCSI_PARAM_ERL:
2606                 case ISCSI_PARAM_TARGET_NAME:
2607                 case ISCSI_PARAM_TPGT:
2608                 case ISCSI_PARAM_USERNAME:
2609                 case ISCSI_PARAM_PASSWORD:
2610                 case ISCSI_PARAM_USERNAME_IN:
2611                 case ISCSI_PARAM_PASSWORD_IN:
2612                 case ISCSI_PARAM_FAST_ABORT:
2613                 case ISCSI_PARAM_ABORT_TMO:
2614                 case ISCSI_PARAM_LU_RESET_TMO:
2615                 case ISCSI_PARAM_TGT_RESET_TMO:
2616                 case ISCSI_PARAM_IFACE_NAME:
2617                 case ISCSI_PARAM_INITIATOR_NAME:
2618                         return S_IRUGO;
2619                 default:
2620                         return 0;
2621                 }
2622         }
2623
2624         return 0;
2625 }
2626 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2627
2628 static int __init libcxgbi_init_module(void)
2629 {
2630         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2631         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2632
2633         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2634                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2635                 ISCSI_AGE_MASK, sw_tag_age_bits);
2636
2637         ddp_setup_host_page_size();
2638         return 0;
2639 }
2640
2641 static void __exit libcxgbi_exit_module(void)
2642 {
2643         cxgbi_device_unregister_all(0xFF);
2644         return;
2645 }
2646
2647 module_init(libcxgbi_init_module);
2648 module_exit(libcxgbi_exit_module);