[SCSI] cxgbi: convert to use iscsi_conn_get_addr_param
[linux-2.6.git] / drivers / scsi / cxgbi / libcxgbi.c
1 /*
2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3  *
4  * Copyright (c) 2010 Chelsio Communications, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation.
9  *
10  * Written by: Karen Xie (kxie@chelsio.com)
11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12  */
13
14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
15
16 #include <linux/skbuff.h>
17 #include <linux/crypto.h>
18 #include <linux/scatterlist.h>
19 #include <linux/pci.h>
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/if_vlan.h>
24 #include <linux/inet.h>
25 #include <net/dst.h>
26 #include <net/route.h>
27 #include <linux/inetdevice.h>   /* ip_dev_find */
28 #include <net/tcp.h>
29
30 static unsigned int dbg_level;
31
32 #include "libcxgbi.h"
33
34 #define DRV_MODULE_NAME         "libcxgbi"
35 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
36 #define DRV_MODULE_VERSION      "0.9.0"
37 #define DRV_MODULE_RELDATE      "Jun. 2010"
38
39 MODULE_AUTHOR("Chelsio Communications, Inc.");
40 MODULE_DESCRIPTION(DRV_MODULE_DESC);
41 MODULE_VERSION(DRV_MODULE_VERSION);
42 MODULE_LICENSE("GPL");
43
44 module_param(dbg_level, uint, 0644);
45 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
46
47
48 /*
49  * cxgbi device management
50  * maintains a list of the cxgbi devices
51  */
52 static LIST_HEAD(cdev_list);
53 static DEFINE_MUTEX(cdev_mutex);
54
55 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
56                                 unsigned int max_conn)
57 {
58         struct cxgbi_ports_map *pmap = &cdev->pmap;
59
60         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
61                                              sizeof(struct cxgbi_sock *),
62                                              GFP_KERNEL);
63         if (!pmap->port_csk) {
64                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
65                 return -ENOMEM;
66         }
67
68         pmap->max_connect = max_conn;
69         pmap->sport_base = base;
70         spin_lock_init(&pmap->lock);
71         return 0;
72 }
73 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
74
75 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
76 {
77         struct cxgbi_ports_map *pmap = &cdev->pmap;
78         struct cxgbi_sock *csk;
79         int i;
80
81         for (i = 0; i < pmap->max_connect; i++) {
82                 if (pmap->port_csk[i]) {
83                         csk = pmap->port_csk[i];
84                         pmap->port_csk[i] = NULL;
85                         log_debug(1 << CXGBI_DBG_SOCK,
86                                 "csk 0x%p, cdev 0x%p, offload down.\n",
87                                 csk, cdev);
88                         spin_lock_bh(&csk->lock);
89                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
90                         cxgbi_sock_closed(csk);
91                         spin_unlock_bh(&csk->lock);
92                         cxgbi_sock_put(csk);
93                 }
94         }
95 }
96 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
97
98 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
99 {
100         log_debug(1 << CXGBI_DBG_DEV,
101                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
102         cxgbi_hbas_remove(cdev);
103         cxgbi_device_portmap_cleanup(cdev);
104         if (cdev->dev_ddp_cleanup)
105                 cdev->dev_ddp_cleanup(cdev);
106         else
107                 cxgbi_ddp_cleanup(cdev);
108         if (cdev->ddp)
109                 cxgbi_ddp_cleanup(cdev);
110         if (cdev->pmap.max_connect)
111                 cxgbi_free_big_mem(cdev->pmap.port_csk);
112         kfree(cdev);
113 }
114
115 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
116                                            unsigned int nports)
117 {
118         struct cxgbi_device *cdev;
119
120         cdev = kzalloc(sizeof(*cdev) + extra + nports *
121                         (sizeof(struct cxgbi_hba *) +
122                          sizeof(struct net_device *)),
123                         GFP_KERNEL);
124         if (!cdev) {
125                 pr_warn("nport %d, OOM.\n", nports);
126                 return NULL;
127         }
128         cdev->ports = (struct net_device **)(cdev + 1);
129         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
130                                                 sizeof(struct net_device *));
131         if (extra)
132                 cdev->dd_data = ((char *)cdev->hbas) +
133                                 nports * sizeof(struct cxgbi_hba *);
134         spin_lock_init(&cdev->pmap.lock);
135
136         mutex_lock(&cdev_mutex);
137         list_add_tail(&cdev->list_head, &cdev_list);
138         mutex_unlock(&cdev_mutex);
139
140         log_debug(1 << CXGBI_DBG_DEV,
141                 "cdev 0x%p, p# %u.\n", cdev, nports);
142         return cdev;
143 }
144 EXPORT_SYMBOL_GPL(cxgbi_device_register);
145
146 void cxgbi_device_unregister(struct cxgbi_device *cdev)
147 {
148         log_debug(1 << CXGBI_DBG_DEV,
149                 "cdev 0x%p, p# %u,%s.\n",
150                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
151         mutex_lock(&cdev_mutex);
152         list_del(&cdev->list_head);
153         mutex_unlock(&cdev_mutex);
154         cxgbi_device_destroy(cdev);
155 }
156 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
157
158 void cxgbi_device_unregister_all(unsigned int flag)
159 {
160         struct cxgbi_device *cdev, *tmp;
161
162         mutex_lock(&cdev_mutex);
163         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
164                 if ((cdev->flags & flag) == flag) {
165                         log_debug(1 << CXGBI_DBG_DEV,
166                                 "cdev 0x%p, p# %u,%s.\n",
167                                 cdev, cdev->nports, cdev->nports ?
168                                  cdev->ports[0]->name : "");
169                         list_del(&cdev->list_head);
170                         cxgbi_device_destroy(cdev);
171                 }
172         }
173         mutex_unlock(&cdev_mutex);
174 }
175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
176
177 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
178 {
179         struct cxgbi_device *cdev, *tmp;
180
181         mutex_lock(&cdev_mutex);
182         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183                 if (cdev->lldev == lldev) {
184                         mutex_unlock(&cdev_mutex);
185                         return cdev;
186                 }
187         }
188         mutex_unlock(&cdev_mutex);
189         log_debug(1 << CXGBI_DBG_DEV,
190                 "lldev 0x%p, NO match found.\n", lldev);
191         return NULL;
192 }
193 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
194
195 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
196                                                         int *port)
197 {
198         struct net_device *vdev = NULL;
199         struct cxgbi_device *cdev, *tmp;
200         int i;
201
202         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203                 vdev = ndev;
204                 ndev = vlan_dev_real_dev(ndev);
205                 log_debug(1 << CXGBI_DBG_DEV,
206                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207         }
208
209         mutex_lock(&cdev_mutex);
210         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
211                 for (i = 0; i < cdev->nports; i++) {
212                         if (ndev == cdev->ports[i]) {
213                                 cdev->hbas[i]->vdev = vdev;
214                                 mutex_unlock(&cdev_mutex);
215                                 if (port)
216                                         *port = i;
217                                 return cdev;
218                         }
219                 }
220         }
221         mutex_unlock(&cdev_mutex);
222         log_debug(1 << CXGBI_DBG_DEV,
223                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
224         return NULL;
225 }
226
227 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
228 {
229         int i;
230         struct cxgbi_hba *chba;
231
232         log_debug(1 << CXGBI_DBG_DEV,
233                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
234
235         for (i = 0; i < cdev->nports; i++) {
236                 chba = cdev->hbas[i];
237                 if (chba) {
238                         cdev->hbas[i] = NULL;
239                         iscsi_host_remove(chba->shost);
240                         pci_dev_put(cdev->pdev);
241                         iscsi_host_free(chba->shost);
242                 }
243         }
244 }
245 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
246
247 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
248                 unsigned int max_id, struct scsi_host_template *sht,
249                 struct scsi_transport_template *stt)
250 {
251         struct cxgbi_hba *chba;
252         struct Scsi_Host *shost;
253         int i, err;
254
255         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
256
257         for (i = 0; i < cdev->nports; i++) {
258                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
259                 if (!shost) {
260                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
261                                 cdev, i, cdev->ports[i]->name);
262                         err = -ENOMEM;
263                         goto err_out;
264                 }
265
266                 shost->transportt = stt;
267                 shost->max_lun = max_lun;
268                 shost->max_id = max_id;
269                 shost->max_channel = 0;
270                 shost->max_cmd_len = 16;
271
272                 chba = iscsi_host_priv(shost);
273                 chba->cdev = cdev;
274                 chba->ndev = cdev->ports[i];
275                 chba->shost = shost;
276
277                 log_debug(1 << CXGBI_DBG_DEV,
278                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
279                         cdev, i, cdev->ports[i]->name, chba);
280
281                 pci_dev_get(cdev->pdev);
282                 err = iscsi_host_add(shost, &cdev->pdev->dev);
283                 if (err) {
284                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
285                                 cdev, i, cdev->ports[i]->name);
286                         pci_dev_put(cdev->pdev);
287                         scsi_host_put(shost);
288                         goto  err_out;
289                 }
290
291                 cdev->hbas[i] = chba;
292         }
293
294         return 0;
295
296 err_out:
297         cxgbi_hbas_remove(cdev);
298         return err;
299 }
300 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
301
302 /*
303  * iSCSI offload
304  *
305  * - source port management
306  *   To find a free source port in the port allocation map we use a very simple
307  *   rotor scheme to look for the next free port.
308  *
309  *   If a source port has been specified make sure that it doesn't collide with
310  *   our normal source port allocation map.  If it's outside the range of our
311  *   allocation/deallocation scheme just let them use it.
312  *
313  *   If the source port is outside our allocation range, the caller is
314  *   responsible for keeping track of their port usage.
315  */
316 static int sock_get_port(struct cxgbi_sock *csk)
317 {
318         struct cxgbi_device *cdev = csk->cdev;
319         struct cxgbi_ports_map *pmap = &cdev->pmap;
320         unsigned int start;
321         int idx;
322
323         if (!pmap->max_connect) {
324                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
325                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
326                 return -EADDRNOTAVAIL;
327         }
328
329         if (csk->saddr.sin_port) {
330                 pr_err("source port NON-ZERO %u.\n",
331                         ntohs(csk->saddr.sin_port));
332                 return -EADDRINUSE;
333         }
334
335         spin_lock_bh(&pmap->lock);
336         if (pmap->used >= pmap->max_connect) {
337                 spin_unlock_bh(&pmap->lock);
338                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
339                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
340                 return -EADDRNOTAVAIL;
341         }
342
343         start = idx = pmap->next;
344         do {
345                 if (++idx >= pmap->max_connect)
346                         idx = 0;
347                 if (!pmap->port_csk[idx]) {
348                         pmap->used++;
349                         csk->saddr.sin_port =
350                                 htons(pmap->sport_base + idx);
351                         pmap->next = idx;
352                         pmap->port_csk[idx] = csk;
353                         spin_unlock_bh(&pmap->lock);
354                         cxgbi_sock_get(csk);
355                         log_debug(1 << CXGBI_DBG_SOCK,
356                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
357                                 cdev, csk->port_id,
358                                 cdev->ports[csk->port_id]->name,
359                                 pmap->sport_base + idx, pmap->next);
360                         return 0;
361                 }
362         } while (idx != start);
363         spin_unlock_bh(&pmap->lock);
364
365         /* should not happen */
366         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
367                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
368                 pmap->next);
369         return -EADDRNOTAVAIL;
370 }
371
372 static void sock_put_port(struct cxgbi_sock *csk)
373 {
374         struct cxgbi_device *cdev = csk->cdev;
375         struct cxgbi_ports_map *pmap = &cdev->pmap;
376
377         if (csk->saddr.sin_port) {
378                 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
379
380                 csk->saddr.sin_port = 0;
381                 if (idx < 0 || idx >= pmap->max_connect) {
382                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
383                                 cdev, csk->port_id,
384                                 cdev->ports[csk->port_id]->name,
385                                 ntohs(csk->saddr.sin_port));
386                         return;
387                 }
388
389                 spin_lock_bh(&pmap->lock);
390                 pmap->port_csk[idx] = NULL;
391                 pmap->used--;
392                 spin_unlock_bh(&pmap->lock);
393
394                 log_debug(1 << CXGBI_DBG_SOCK,
395                         "cdev 0x%p, p#%u %s, release %u.\n",
396                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
397                         pmap->sport_base + idx);
398
399                 cxgbi_sock_put(csk);
400         }
401 }
402
403 /*
404  * iscsi tcp connection
405  */
406 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
407 {
408         if (csk->cpl_close) {
409                 kfree_skb(csk->cpl_close);
410                 csk->cpl_close = NULL;
411         }
412         if (csk->cpl_abort_req) {
413                 kfree_skb(csk->cpl_abort_req);
414                 csk->cpl_abort_req = NULL;
415         }
416         if (csk->cpl_abort_rpl) {
417                 kfree_skb(csk->cpl_abort_rpl);
418                 csk->cpl_abort_rpl = NULL;
419         }
420 }
421 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
422
423 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
424 {
425         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
426
427         if (!csk) {
428                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
429                 return NULL;
430         }
431
432         if (cdev->csk_alloc_cpls(csk) < 0) {
433                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
434                 kfree(csk);
435                 return NULL;
436         }
437
438         spin_lock_init(&csk->lock);
439         kref_init(&csk->refcnt);
440         skb_queue_head_init(&csk->receive_queue);
441         skb_queue_head_init(&csk->write_queue);
442         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
443         rwlock_init(&csk->callback_lock);
444         csk->cdev = cdev;
445         csk->flags = 0;
446         cxgbi_sock_set_state(csk, CTP_CLOSED);
447
448         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
449
450         return csk;
451 }
452
453 static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
454                                         __be16 sport, __be16 dport, u8 tos)
455 {
456         struct rtable *rt;
457         struct flowi fl = {
458                 .oif = 0,
459                 .nl_u = {
460                         .ip4_u = {
461                                 .daddr = daddr,
462                                 .saddr = saddr,
463                                 .tos = tos }
464                         },
465                 .proto = IPPROTO_TCP,
466                 .uli_u = {
467                         .ports = {
468                                 .sport = sport,
469                                 .dport = dport }
470                         }
471         };
472
473         if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
474                 return NULL;
475
476         return rt;
477 }
478
479 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
480 {
481         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
482         struct dst_entry *dst;
483         struct net_device *ndev;
484         struct cxgbi_device *cdev;
485         struct rtable *rt = NULL;
486         struct cxgbi_sock *csk = NULL;
487         unsigned int mtu = 0;
488         int port = 0xFFFF;
489         int err = 0;
490
491         if (daddr->sin_family != AF_INET) {
492                 pr_info("address family 0x%x NOT supported.\n",
493                         daddr->sin_family);
494                 err = -EAFNOSUPPORT;
495                 goto err_out;
496         }
497
498         rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
499         if (!rt) {
500                 pr_info("no route to ipv4 0x%x, port %u.\n",
501                         daddr->sin_addr.s_addr, daddr->sin_port);
502                 err = -ENETUNREACH;
503                 goto err_out;
504         }
505         dst = &rt->dst;
506         ndev = dst->neighbour->dev;
507
508         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
509                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
510                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
511                         ndev->name);
512                 err = -ENETUNREACH;
513                 goto rel_rt;
514         }
515
516         if (ndev->flags & IFF_LOOPBACK) {
517                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
518                 mtu = ndev->mtu;
519                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
520                         dst->neighbour->dev->name, ndev->name, mtu);
521         }
522
523         cdev = cxgbi_device_find_by_netdev(ndev, &port);
524         if (!cdev) {
525                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
526                         &daddr->sin_addr.s_addr, ndev->name);
527                 err = -ENETUNREACH;
528                 goto rel_rt;
529         }
530         log_debug(1 << CXGBI_DBG_SOCK,
531                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
532                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
533                            port, ndev->name, cdev);
534
535         csk = cxgbi_sock_create(cdev);
536         if (!csk) {
537                 err = -ENOMEM;
538                 goto rel_rt;
539         }
540         csk->cdev = cdev;
541         csk->port_id = port;
542         csk->mtu = mtu;
543         csk->dst = dst;
544         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
545         csk->daddr.sin_port = daddr->sin_port;
546         csk->daddr.sin_family = daddr->sin_family;
547         csk->saddr.sin_addr.s_addr = rt->rt_src;
548
549         return csk;
550
551 rel_rt:
552         ip_rt_put(rt);
553         if (csk)
554                 cxgbi_sock_closed(csk);
555 err_out:
556         return ERR_PTR(err);
557 }
558
559 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
560                         unsigned int opt)
561 {
562         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
563         dst_confirm(csk->dst);
564         smp_mb();
565         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
566 }
567 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
568
569 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
570 {
571         log_debug(1 << CXGBI_DBG_SOCK,
572                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
573                 csk, csk->state, csk->flags, csk->user_data);
574
575         if (csk->state != CTP_ESTABLISHED) {
576                 read_lock_bh(&csk->callback_lock);
577                 if (csk->user_data)
578                         iscsi_conn_failure(csk->user_data,
579                                         ISCSI_ERR_CONN_FAILED);
580                 read_unlock_bh(&csk->callback_lock);
581         }
582 }
583
584 void cxgbi_sock_closed(struct cxgbi_sock *csk)
585 {
586         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
587                 csk, (csk)->state, (csk)->flags, (csk)->tid);
588         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
589         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
590                 return;
591         if (csk->saddr.sin_port)
592                 sock_put_port(csk);
593         if (csk->dst)
594                 dst_release(csk->dst);
595         csk->cdev->csk_release_offload_resources(csk);
596         cxgbi_sock_set_state(csk, CTP_CLOSED);
597         cxgbi_inform_iscsi_conn_closing(csk);
598         cxgbi_sock_put(csk);
599 }
600 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
601
602 static void need_active_close(struct cxgbi_sock *csk)
603 {
604         int data_lost;
605         int close_req = 0;
606
607         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
608                 csk, (csk)->state, (csk)->flags, (csk)->tid);
609         spin_lock_bh(&csk->lock);
610         dst_confirm(csk->dst);
611         data_lost = skb_queue_len(&csk->receive_queue);
612         __skb_queue_purge(&csk->receive_queue);
613
614         if (csk->state == CTP_ACTIVE_OPEN)
615                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
616         else if (csk->state == CTP_ESTABLISHED) {
617                 close_req = 1;
618                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
619         } else if (csk->state == CTP_PASSIVE_CLOSE) {
620                 close_req = 1;
621                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
622         }
623
624         if (close_req) {
625                 if (data_lost)
626                         csk->cdev->csk_send_abort_req(csk);
627                 else
628                         csk->cdev->csk_send_close_req(csk);
629         }
630
631         spin_unlock_bh(&csk->lock);
632 }
633
634 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
635 {
636         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
637                         csk, csk->state, csk->flags,
638                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
639                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
640                         errno);
641
642         cxgbi_sock_set_state(csk, CTP_CONNECTING);
643         csk->err = errno;
644         cxgbi_sock_closed(csk);
645 }
646 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
647
648 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
649 {
650         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
651
652         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
653                 csk, (csk)->state, (csk)->flags, (csk)->tid);
654         cxgbi_sock_get(csk);
655         spin_lock_bh(&csk->lock);
656         if (csk->state == CTP_ACTIVE_OPEN)
657                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
658         spin_unlock_bh(&csk->lock);
659         cxgbi_sock_put(csk);
660         __kfree_skb(skb);
661 }
662 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
663
664 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
665 {
666         cxgbi_sock_get(csk);
667         spin_lock_bh(&csk->lock);
668         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
669                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
670                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
671                 else {
672                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
673                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
674                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
675                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
676                                         csk, csk->state, csk->flags, csk->tid);
677                         cxgbi_sock_closed(csk);
678                 }
679         }
680         spin_unlock_bh(&csk->lock);
681         cxgbi_sock_put(csk);
682 }
683 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
684
685 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
686 {
687         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
688                 csk, (csk)->state, (csk)->flags, (csk)->tid);
689         cxgbi_sock_get(csk);
690         spin_lock_bh(&csk->lock);
691
692         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
693                 goto done;
694
695         switch (csk->state) {
696         case CTP_ESTABLISHED:
697                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
698                 break;
699         case CTP_ACTIVE_CLOSE:
700                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
701                 break;
702         case CTP_CLOSE_WAIT_1:
703                 cxgbi_sock_closed(csk);
704                 break;
705         case CTP_ABORTING:
706                 break;
707         default:
708                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
709                         csk, csk->state, csk->flags, csk->tid);
710         }
711         cxgbi_inform_iscsi_conn_closing(csk);
712 done:
713         spin_unlock_bh(&csk->lock);
714         cxgbi_sock_put(csk);
715 }
716 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
717
718 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
719 {
720         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
721                 csk, (csk)->state, (csk)->flags, (csk)->tid);
722         cxgbi_sock_get(csk);
723         spin_lock_bh(&csk->lock);
724
725         csk->snd_una = snd_nxt - 1;
726         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
727                 goto done;
728
729         switch (csk->state) {
730         case CTP_ACTIVE_CLOSE:
731                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
732                 break;
733         case CTP_CLOSE_WAIT_1:
734         case CTP_CLOSE_WAIT_2:
735                 cxgbi_sock_closed(csk);
736                 break;
737         case CTP_ABORTING:
738                 break;
739         default:
740                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
741                         csk, csk->state, csk->flags, csk->tid);
742         }
743 done:
744         spin_unlock_bh(&csk->lock);
745         cxgbi_sock_put(csk);
746 }
747 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
748
749 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
750                            unsigned int snd_una, int seq_chk)
751 {
752         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
753                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
754                         csk, csk->state, csk->flags, csk->tid, credits,
755                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
756
757         spin_lock_bh(&csk->lock);
758
759         csk->wr_cred += credits;
760         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
761                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
762
763         while (credits) {
764                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
765
766                 if (unlikely(!p)) {
767                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
768                                 csk, csk->state, csk->flags, csk->tid, credits,
769                                 csk->wr_cred, csk->wr_una_cred);
770                         break;
771                 }
772
773                 if (unlikely(credits < p->csum)) {
774                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
775                                 csk, csk->state, csk->flags, csk->tid,
776                                 credits, csk->wr_cred, csk->wr_una_cred,
777                                 p->csum);
778                         p->csum -= credits;
779                         break;
780                 } else {
781                         cxgbi_sock_dequeue_wr(csk);
782                         credits -= p->csum;
783                         kfree_skb(p);
784                 }
785         }
786
787         cxgbi_sock_check_wr_invariants(csk);
788
789         if (seq_chk) {
790                 if (unlikely(before(snd_una, csk->snd_una))) {
791                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
792                                 csk, csk->state, csk->flags, csk->tid, snd_una,
793                                 csk->snd_una);
794                         goto done;
795                 }
796
797                 if (csk->snd_una != snd_una) {
798                         csk->snd_una = snd_una;
799                         dst_confirm(csk->dst);
800                 }
801         }
802
803         if (skb_queue_len(&csk->write_queue)) {
804                 if (csk->cdev->csk_push_tx_frames(csk, 0))
805                         cxgbi_conn_tx_open(csk);
806         } else
807                 cxgbi_conn_tx_open(csk);
808 done:
809         spin_unlock_bh(&csk->lock);
810 }
811 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
812
813 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
814                                              unsigned short mtu)
815 {
816         int i = 0;
817
818         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
819                 ++i;
820
821         return i;
822 }
823
824 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
825 {
826         unsigned int idx;
827         struct dst_entry *dst = csk->dst;
828
829         csk->advmss = dst_metric_advmss(dst);
830
831         if (csk->advmss > pmtu - 40)
832                 csk->advmss = pmtu - 40;
833         if (csk->advmss < csk->cdev->mtus[0] - 40)
834                 csk->advmss = csk->cdev->mtus[0] - 40;
835         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
836
837         return idx;
838 }
839 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
840
841 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
842 {
843         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
844         __skb_queue_tail(&csk->write_queue, skb);
845 }
846 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
847
848 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
849 {
850         struct sk_buff *skb;
851
852         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
853                 kfree_skb(skb);
854 }
855 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
856
857 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
858 {
859         int pending = cxgbi_sock_count_pending_wrs(csk);
860
861         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
862                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
863                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
864 }
865 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
866
867 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
868 {
869         struct cxgbi_device *cdev = csk->cdev;
870         struct sk_buff *next;
871         int err, copied = 0;
872
873         spin_lock_bh(&csk->lock);
874
875         if (csk->state != CTP_ESTABLISHED) {
876                 log_debug(1 << CXGBI_DBG_PDU_TX,
877                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
878                         csk, csk->state, csk->flags, csk->tid);
879                 err = -EAGAIN;
880                 goto out_err;
881         }
882
883         if (csk->err) {
884                 log_debug(1 << CXGBI_DBG_PDU_TX,
885                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
886                         csk, csk->state, csk->flags, csk->tid, csk->err);
887                 err = -EPIPE;
888                 goto out_err;
889         }
890
891         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
892                 log_debug(1 << CXGBI_DBG_PDU_TX,
893                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
894                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
895                         csk->snd_una, cdev->snd_win);
896                 err = -ENOBUFS;
897                 goto out_err;
898         }
899
900         while (skb) {
901                 int frags = skb_shinfo(skb)->nr_frags +
902                                 (skb->len != skb->data_len);
903
904                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
905                         pr_err("csk 0x%p, skb head %u < %u.\n",
906                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
907                         err = -EINVAL;
908                         goto out_err;
909                 }
910
911                 if (frags >= SKB_WR_LIST_SIZE) {
912                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
913                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
914                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
915                         err = -EINVAL;
916                         goto out_err;
917                 }
918
919                 next = skb->next;
920                 skb->next = NULL;
921                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
922                 cxgbi_sock_skb_entail(csk, skb);
923                 copied += skb->len;
924                 csk->write_seq += skb->len +
925                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
926                 skb = next;
927         }
928 done:
929         if (likely(skb_queue_len(&csk->write_queue)))
930                 cdev->csk_push_tx_frames(csk, 1);
931         spin_unlock_bh(&csk->lock);
932         return copied;
933
934 out_err:
935         if (copied == 0 && err == -EPIPE)
936                 copied = csk->err ? csk->err : -EPIPE;
937         else
938                 copied = err;
939         goto done;
940 }
941
942 /*
943  * Direct Data Placement -
944  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
945  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
946  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
947  * The host memory address is programmed into h/w in the format of pagepod
948  * entries.
949  * The location of the pagepod entry is encoded into ddp tag which is used as
950  * the base for ITT/TTT.
951  */
952
953 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
954 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
955 static unsigned char page_idx = DDP_PGIDX_MAX;
956
957 static unsigned char sw_tag_idx_bits;
958 static unsigned char sw_tag_age_bits;
959
960 /*
961  * Direct-Data Placement page size adjustment
962  */
963 static int ddp_adjust_page_table(void)
964 {
965         int i;
966         unsigned int base_order, order;
967
968         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
969                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
970                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
971                 return -EINVAL;
972         }
973
974         base_order = get_order(1UL << ddp_page_shift[0]);
975         order = get_order(1UL << PAGE_SHIFT);
976
977         for (i = 0; i < DDP_PGIDX_MAX; i++) {
978                 /* first is the kernel page size, then just doubling */
979                 ddp_page_order[i] = order - base_order + i;
980                 ddp_page_shift[i] = PAGE_SHIFT + i;
981         }
982         return 0;
983 }
984
985 static int ddp_find_page_index(unsigned long pgsz)
986 {
987         int i;
988
989         for (i = 0; i < DDP_PGIDX_MAX; i++) {
990                 if (pgsz == (1UL << ddp_page_shift[i]))
991                         return i;
992         }
993         pr_info("ddp page size %lu not supported.\n", pgsz);
994         return DDP_PGIDX_MAX;
995 }
996
997 static void ddp_setup_host_page_size(void)
998 {
999         if (page_idx == DDP_PGIDX_MAX) {
1000                 page_idx = ddp_find_page_index(PAGE_SIZE);
1001
1002                 if (page_idx == DDP_PGIDX_MAX) {
1003                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1004                         if (ddp_adjust_page_table() < 0) {
1005                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1006                                 return;
1007                         }
1008                         page_idx = ddp_find_page_index(PAGE_SIZE);
1009                 }
1010                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1011         }
1012 }
1013
1014 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1015 {
1016         int i;
1017
1018         for (i = 0; i < DDP_PGIDX_MAX; i++)
1019                 pgsz_factor[i] = ddp_page_order[i];
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1022
1023 /*
1024  * DDP setup & teardown
1025  */
1026
1027 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1028                         struct cxgbi_pagepod_hdr *hdr,
1029                         struct cxgbi_gather_list *gl, unsigned int gidx)
1030 {
1031         int i;
1032
1033         memcpy(ppod, hdr, sizeof(*hdr));
1034         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1035                 ppod->addr[i] = gidx < gl->nelem ?
1036                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1037         }
1038 }
1039 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1040
1041 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1042 {
1043         memset(ppod, 0, sizeof(*ppod));
1044 }
1045 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1046
1047 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1048                                         unsigned int start, unsigned int max,
1049                                         unsigned int count,
1050                                         struct cxgbi_gather_list *gl)
1051 {
1052         unsigned int i, j, k;
1053
1054         /*  not enough entries */
1055         if ((max - start) < count) {
1056                 log_debug(1 << CXGBI_DBG_DDP,
1057                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1058                 return -EBUSY;
1059         }
1060
1061         max -= count;
1062         spin_lock(&ddp->map_lock);
1063         for (i = start; i < max;) {
1064                 for (j = 0, k = i; j < count; j++, k++) {
1065                         if (ddp->gl_map[k])
1066                                 break;
1067                 }
1068                 if (j == count) {
1069                         for (j = 0, k = i; j < count; j++, k++)
1070                                 ddp->gl_map[k] = gl;
1071                         spin_unlock(&ddp->map_lock);
1072                         return i;
1073                 }
1074                 i += j + 1;
1075         }
1076         spin_unlock(&ddp->map_lock);
1077         log_debug(1 << CXGBI_DBG_DDP,
1078                 "NO suitable entries %u available.\n", count);
1079         return -EBUSY;
1080 }
1081
1082 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1083                                                 int start, int count)
1084 {
1085         spin_lock(&ddp->map_lock);
1086         memset(&ddp->gl_map[start], 0,
1087                 count * sizeof(struct cxgbi_gather_list *));
1088         spin_unlock(&ddp->map_lock);
1089 }
1090
1091 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1092                                         struct cxgbi_gather_list *gl)
1093 {
1094         int i;
1095
1096         for (i = 0; i < gl->nelem; i++)
1097                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1098                                 PCI_DMA_FROMDEVICE);
1099 }
1100
1101 static inline int ddp_gl_map(struct pci_dev *pdev,
1102                                     struct cxgbi_gather_list *gl)
1103 {
1104         int i;
1105
1106         for (i = 0; i < gl->nelem; i++) {
1107                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1108                                                 PAGE_SIZE,
1109                                                 PCI_DMA_FROMDEVICE);
1110                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1111                         log_debug(1 << CXGBI_DBG_DDP,
1112                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1113                                 i, gl->pages[i], pdev);
1114                         goto unmap;
1115                 }
1116         }
1117         return i;
1118 unmap:
1119         if (i) {
1120                 unsigned int nelem = gl->nelem;
1121
1122                 gl->nelem = i;
1123                 ddp_gl_unmap(pdev, gl);
1124                 gl->nelem = nelem;
1125         }
1126         return -EINVAL;
1127 }
1128
1129 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1130                                   struct pci_dev *pdev)
1131 {
1132         ddp_gl_unmap(pdev, gl);
1133         kfree(gl);
1134 }
1135
1136 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1137                                                     struct scatterlist *sgl,
1138                                                     unsigned int sgcnt,
1139                                                     struct pci_dev *pdev,
1140                                                     gfp_t gfp)
1141 {
1142         struct cxgbi_gather_list *gl;
1143         struct scatterlist *sg = sgl;
1144         struct page *sgpage = sg_page(sg);
1145         unsigned int sglen = sg->length;
1146         unsigned int sgoffset = sg->offset;
1147         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1148                                 PAGE_SHIFT;
1149         int i = 1, j = 0;
1150
1151         if (xferlen < DDP_THRESHOLD) {
1152                 log_debug(1 << CXGBI_DBG_DDP,
1153                         "xfer %u < threshold %u, no ddp.\n",
1154                         xferlen, DDP_THRESHOLD);
1155                 return NULL;
1156         }
1157
1158         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1159                      npages * (sizeof(dma_addr_t) +
1160                      sizeof(struct page *)), gfp);
1161         if (!gl) {
1162                 log_debug(1 << CXGBI_DBG_DDP,
1163                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1164                 return NULL;
1165         }
1166
1167          log_debug(1 << CXGBI_DBG_DDP,
1168                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1169
1170         gl->pages = (struct page **)&gl->phys_addr[npages];
1171         gl->nelem = npages;
1172         gl->length = xferlen;
1173         gl->offset = sgoffset;
1174         gl->pages[0] = sgpage;
1175
1176         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1177                 i++, sg = sg_next(sg)) {
1178                 struct page *page = sg_page(sg);
1179
1180                 if (sgpage == page && sg->offset == sgoffset + sglen)
1181                         sglen += sg->length;
1182                 else {
1183                         /*  make sure the sgl is fit for ddp:
1184                          *  each has the same page size, and
1185                          *  all of the middle pages are used completely
1186                          */
1187                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1188                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1189                                 log_debug(1 << CXGBI_DBG_DDP,
1190                                         "page %d/%u, %u + %u.\n",
1191                                         i, sgcnt, sgoffset, sglen);
1192                                 goto error_out;
1193                         }
1194
1195                         j++;
1196                         if (j == gl->nelem || sg->offset) {
1197                                 log_debug(1 << CXGBI_DBG_DDP,
1198                                         "page %d/%u, offset %u.\n",
1199                                         j, gl->nelem, sg->offset);
1200                                 goto error_out;
1201                         }
1202                         gl->pages[j] = page;
1203                         sglen = sg->length;
1204                         sgoffset = sg->offset;
1205                         sgpage = page;
1206                 }
1207         }
1208         gl->nelem = ++j;
1209
1210         if (ddp_gl_map(pdev, gl) < 0)
1211                 goto error_out;
1212
1213         return gl;
1214
1215 error_out:
1216         kfree(gl);
1217         return NULL;
1218 }
1219
1220 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1221 {
1222         struct cxgbi_device *cdev = chba->cdev;
1223         struct cxgbi_ddp_info *ddp = cdev->ddp;
1224         u32 idx;
1225
1226         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1227         if (idx < ddp->nppods) {
1228                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1229                 unsigned int npods;
1230
1231                 if (!gl || !gl->nelem) {
1232                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1233                                 tag, idx, gl, gl ? gl->nelem : 0);
1234                         return;
1235                 }
1236                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1237                 log_debug(1 << CXGBI_DBG_DDP,
1238                         "tag 0x%x, release idx %u, npods %u.\n",
1239                         tag, idx, npods);
1240                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1241                 ddp_unmark_entries(ddp, idx, npods);
1242                 ddp_release_gl(gl, ddp->pdev);
1243         } else
1244                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1245 }
1246
1247 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1248                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1249                            gfp_t gfp)
1250 {
1251         struct cxgbi_device *cdev = csk->cdev;
1252         struct cxgbi_ddp_info *ddp = cdev->ddp;
1253         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1254         struct cxgbi_pagepod_hdr hdr;
1255         unsigned int npods;
1256         int idx = -1;
1257         int err = -ENOMEM;
1258         u32 tag;
1259
1260         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1261         if (ddp->idx_last == ddp->nppods)
1262                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1263                                                         npods, gl);
1264         else {
1265                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1266                                                         ddp->nppods, npods,
1267                                                         gl);
1268                 if (idx < 0 && ddp->idx_last >= npods) {
1269                         idx = ddp_find_unused_entries(ddp, 0,
1270                                 min(ddp->idx_last + npods, ddp->nppods),
1271                                                         npods, gl);
1272                 }
1273         }
1274         if (idx < 0) {
1275                 log_debug(1 << CXGBI_DBG_DDP,
1276                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1277                         gl->length, gl->nelem, npods);
1278                 return idx;
1279         }
1280
1281         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1282         tag |= idx << PPOD_IDX_SHIFT;
1283
1284         hdr.rsvd = 0;
1285         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1286         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1287         hdr.max_offset = htonl(gl->length);
1288         hdr.page_offset = htonl(gl->offset);
1289
1290         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1291         if (err < 0)
1292                 goto unmark_entries;
1293
1294         ddp->idx_last = idx;
1295         log_debug(1 << CXGBI_DBG_DDP,
1296                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1297                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1298                 npods);
1299         *tagp = tag;
1300         return 0;
1301
1302 unmark_entries:
1303         ddp_unmark_entries(ddp, idx, npods);
1304         return err;
1305 }
1306
1307 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1308                         unsigned int sw_tag, unsigned int xferlen,
1309                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1310 {
1311         struct cxgbi_device *cdev = csk->cdev;
1312         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1313         struct cxgbi_gather_list *gl;
1314         int err;
1315
1316         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1317             xferlen < DDP_THRESHOLD) {
1318                 log_debug(1 << CXGBI_DBG_DDP,
1319                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1320                 return -EINVAL;
1321         }
1322
1323         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1324                 log_debug(1 << CXGBI_DBG_DDP,
1325                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1326                 return -EINVAL;
1327         }
1328
1329         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1330         if (!gl)
1331                 return -ENOMEM;
1332
1333         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1334         if (err < 0)
1335                 ddp_release_gl(gl, cdev->pdev);
1336
1337         return err;
1338 }
1339
1340 static void ddp_destroy(struct kref *kref)
1341 {
1342         struct cxgbi_ddp_info *ddp = container_of(kref,
1343                                                 struct cxgbi_ddp_info,
1344                                                 refcnt);
1345         struct cxgbi_device *cdev = ddp->cdev;
1346         int i = 0;
1347
1348         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1349
1350         while (i < ddp->nppods) {
1351                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1352
1353                 if (gl) {
1354                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1355                                         >> PPOD_PAGES_SHIFT;
1356                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1357                         kfree(gl);
1358                         i += npods;
1359                 } else
1360                         i++;
1361         }
1362         cxgbi_free_big_mem(ddp);
1363 }
1364
1365 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1366 {
1367         struct cxgbi_ddp_info *ddp = cdev->ddp;
1368
1369         log_debug(1 << CXGBI_DBG_DDP,
1370                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1371         cdev->ddp = NULL;
1372         if (ddp)
1373                 return kref_put(&ddp->refcnt, ddp_destroy);
1374         return 0;
1375 }
1376 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1377
1378 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1379                    unsigned int llimit, unsigned int ulimit,
1380                    unsigned int max_txsz, unsigned int max_rxsz)
1381 {
1382         struct cxgbi_ddp_info *ddp;
1383         unsigned int ppmax, bits;
1384
1385         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1386         bits = __ilog2_u32(ppmax) + 1;
1387         if (bits > PPOD_IDX_MAX_SIZE)
1388                 bits = PPOD_IDX_MAX_SIZE;
1389         ppmax = (1 << (bits - 1)) - 1;
1390
1391         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1392                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1393                                          sizeof(struct sk_buff *)),
1394                                 GFP_KERNEL);
1395         if (!ddp) {
1396                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1397                 return -ENOMEM;
1398         }
1399         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1400         cdev->ddp = ddp;
1401
1402         spin_lock_init(&ddp->map_lock);
1403         kref_init(&ddp->refcnt);
1404
1405         ddp->cdev = cdev;
1406         ddp->pdev = cdev->pdev;
1407         ddp->llimit = llimit;
1408         ddp->ulimit = ulimit;
1409         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1410         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1411         ddp->nppods = ppmax;
1412         ddp->idx_last = ppmax;
1413         ddp->idx_bits = bits;
1414         ddp->idx_mask = (1 << bits) - 1;
1415         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1416
1417         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1418         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1419         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1420         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1421
1422         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1423                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1424                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1425                 cdev->tag_format.rsvd_mask);
1426
1427         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1428                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1429         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1430                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1431
1432         log_debug(1 << CXGBI_DBG_DDP,
1433                 "%s max payload size: %u/%u, %u/%u.\n",
1434                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1435                 cdev->rx_max_size, ddp->max_rxsz);
1436         return 0;
1437 }
1438 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1439
1440 /*
1441  * APIs interacting with open-iscsi libraries
1442  */
1443
1444 static unsigned char padding[4];
1445
1446 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1447 {
1448         struct scsi_cmnd *sc = task->sc;
1449         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1450         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1451         struct cxgbi_hba *chba = cconn->chba;
1452         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1453         u32 tag = ntohl((__force u32)hdr_itt);
1454
1455         log_debug(1 << CXGBI_DBG_DDP,
1456                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1457         if (sc &&
1458             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1459             cxgbi_is_ddp_tag(tformat, tag))
1460                 ddp_tag_release(chba, tag);
1461 }
1462
1463 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1464 {
1465         struct scsi_cmnd *sc = task->sc;
1466         struct iscsi_conn *conn = task->conn;
1467         struct iscsi_session *sess = conn->session;
1468         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1469         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1470         struct cxgbi_hba *chba = cconn->chba;
1471         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1472         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1473         u32 tag = 0;
1474         int err = -EINVAL;
1475
1476         if (sc &&
1477             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1478                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1479                                         scsi_in(sc)->length,
1480                                         scsi_in(sc)->table.sgl,
1481                                         scsi_in(sc)->table.nents,
1482                                         GFP_ATOMIC);
1483                 if (err < 0)
1484                         log_debug(1 << CXGBI_DBG_DDP,
1485                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1486                                 cconn->cep->csk, task, scsi_in(sc)->length,
1487                                 scsi_in(sc)->table.nents);
1488         }
1489
1490         if (err < 0)
1491                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1492         /*  the itt need to sent in big-endian order */
1493         *hdr_itt = (__force itt_t)htonl(tag);
1494
1495         log_debug(1 << CXGBI_DBG_DDP,
1496                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1497                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1498         return 0;
1499 }
1500
1501 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1502 {
1503         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1504         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1505         struct cxgbi_device *cdev = cconn->chba->cdev;
1506         u32 tag = ntohl((__force u32) itt);
1507         u32 sw_bits;
1508
1509         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1510         if (idx)
1511                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1512         if (age)
1513                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1514
1515         log_debug(1 << CXGBI_DBG_DDP,
1516                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1517                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1518                 age ? *age : 0xFF);
1519 }
1520 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1521
1522 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1523 {
1524         struct iscsi_conn *conn = csk->user_data;
1525
1526         if (conn) {
1527                 log_debug(1 << CXGBI_DBG_SOCK,
1528                         "csk 0x%p, cid %d.\n", csk, conn->id);
1529                 iscsi_conn_queue_work(conn);
1530         }
1531 }
1532 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1533
1534 /*
1535  * pdu receive, interact with libiscsi_tcp
1536  */
1537 static inline int read_pdu_skb(struct iscsi_conn *conn,
1538                                struct sk_buff *skb,
1539                                unsigned int offset,
1540                                int offloaded)
1541 {
1542         int status = 0;
1543         int bytes_read;
1544
1545         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1546         switch (status) {
1547         case ISCSI_TCP_CONN_ERR:
1548                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1549                           skb, offset, offloaded);
1550                 return -EIO;
1551         case ISCSI_TCP_SUSPENDED:
1552                 log_debug(1 << CXGBI_DBG_PDU_RX,
1553                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1554                         skb, offset, offloaded, bytes_read);
1555                 /* no transfer - just have caller flush queue */
1556                 return bytes_read;
1557         case ISCSI_TCP_SKB_DONE:
1558                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1559                         skb, offset, offloaded);
1560                 /*
1561                  * pdus should always fit in the skb and we should get
1562                  * segment done notifcation.
1563                  */
1564                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1565                 return -EFAULT;
1566         case ISCSI_TCP_SEGMENT_DONE:
1567                 log_debug(1 << CXGBI_DBG_PDU_RX,
1568                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1569                         skb, offset, offloaded, bytes_read);
1570                 return bytes_read;
1571         default:
1572                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1573                         skb, offset, offloaded, status);
1574                 return -EINVAL;
1575         }
1576 }
1577
1578 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1579 {
1580         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1581
1582         log_debug(1 << CXGBI_DBG_PDU_RX,
1583                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1584                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1585
1586         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1587                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1588                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1589                 return -EIO;
1590         }
1591
1592         if (conn->hdrdgst_en &&
1593             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1594                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1595                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1596                 return -EIO;
1597         }
1598
1599         return read_pdu_skb(conn, skb, 0, 0);
1600 }
1601
1602 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1603                              struct sk_buff *skb, unsigned int offset)
1604 {
1605         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1606         bool offloaded = 0;
1607         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1608
1609         log_debug(1 << CXGBI_DBG_PDU_RX,
1610                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1611                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1612
1613         if (conn->datadgst_en &&
1614             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1615                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1616                         conn, lskb, cxgbi_skcb_flags(lskb));
1617                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1618                 return -EIO;
1619         }
1620
1621         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1622                 return 0;
1623
1624         /* coalesced, add header digest length */
1625         if (lskb == skb && conn->hdrdgst_en)
1626                 offset += ISCSI_DIGEST_SIZE;
1627
1628         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1629                 offloaded = 1;
1630
1631         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1632                 log_debug(1 << CXGBI_DBG_PDU_RX,
1633                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1634                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1635                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1636
1637         return read_pdu_skb(conn, skb, offset, offloaded);
1638 }
1639
1640 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1641 {
1642         struct cxgbi_device *cdev = csk->cdev;
1643         int must_send;
1644         u32 credits;
1645
1646         log_debug(1 << CXGBI_DBG_PDU_RX,
1647                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1648                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1649                 csk->rcv_wup, cdev->rx_credit_thres,
1650                 cdev->rcv_win);
1651
1652         if (csk->state != CTP_ESTABLISHED)
1653                 return;
1654
1655         credits = csk->copied_seq - csk->rcv_wup;
1656         if (unlikely(!credits))
1657                 return;
1658         if (unlikely(cdev->rx_credit_thres == 0))
1659                 return;
1660
1661         must_send = credits + 16384 >= cdev->rcv_win;
1662         if (must_send || credits >= cdev->rx_credit_thres)
1663                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1664 }
1665
1666 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1667 {
1668         struct cxgbi_device *cdev = csk->cdev;
1669         struct iscsi_conn *conn = csk->user_data;
1670         struct sk_buff *skb;
1671         unsigned int read = 0;
1672         int err = 0;
1673
1674         log_debug(1 << CXGBI_DBG_PDU_RX,
1675                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1676
1677         if (unlikely(!conn || conn->suspend_rx)) {
1678                 log_debug(1 << CXGBI_DBG_PDU_RX,
1679                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1680                         csk, conn, conn ? conn->id : 0xFF,
1681                         conn ? conn->suspend_rx : 0xFF);
1682                 return;
1683         }
1684
1685         while (!err) {
1686                 skb = skb_peek(&csk->receive_queue);
1687                 if (!skb ||
1688                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1689                         if (skb)
1690                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1691                                         "skb 0x%p, NOT ready 0x%lx.\n",
1692                                         skb, cxgbi_skcb_flags(skb));
1693                         break;
1694                 }
1695                 __skb_unlink(skb, &csk->receive_queue);
1696
1697                 read += cxgbi_skcb_rx_pdulen(skb);
1698                 log_debug(1 << CXGBI_DBG_PDU_RX,
1699                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1700                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1701                         cxgbi_skcb_rx_pdulen(skb));
1702
1703                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1704                         err = skb_read_pdu_bhs(conn, skb);
1705                         if (err < 0) {
1706                                 pr_err("coalesced bhs, 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                                 goto skb_done;
1712                         }
1713                         err = skb_read_pdu_data(conn, skb, skb,
1714                                                 err + cdev->skb_rx_extra);
1715                         if (err < 0)
1716                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1717                                         "f 0x%lx, plen %u.\n",
1718                                         csk, skb, skb->len,
1719                                         cxgbi_skcb_flags(skb),
1720                                         cxgbi_skcb_rx_pdulen(skb));
1721                 } else {
1722                         err = skb_read_pdu_bhs(conn, skb);
1723                         if (err < 0) {
1724                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1725                                         "f 0x%lx, plen %u.\n",
1726                                         csk, skb, skb->len,
1727                                         cxgbi_skcb_flags(skb),
1728                                         cxgbi_skcb_rx_pdulen(skb));
1729                                 goto skb_done;
1730                         }
1731
1732                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1733                                 struct sk_buff *dskb;
1734
1735                                 dskb = skb_peek(&csk->receive_queue);
1736                                 if (!dskb) {
1737                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1738                                                 " plen %u, NO data.\n",
1739                                                 csk, skb, skb->len,
1740                                                 cxgbi_skcb_flags(skb),
1741                                                 cxgbi_skcb_rx_pdulen(skb));
1742                                         err = -EIO;
1743                                         goto skb_done;
1744                                 }
1745                                 __skb_unlink(dskb, &csk->receive_queue);
1746
1747                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1748                                 if (err < 0)
1749                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1750                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1751                                                 "%u.\n",
1752                                                 csk, skb, skb->len,
1753                                                 cxgbi_skcb_flags(skb),
1754                                                 cxgbi_skcb_rx_pdulen(skb),
1755                                                 dskb, dskb->len);
1756                                 __kfree_skb(dskb);
1757                         } else
1758                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1759                 }
1760 skb_done:
1761                 __kfree_skb(skb);
1762
1763                 if (err < 0)
1764                         break;
1765         }
1766
1767         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1768         if (read) {
1769                 csk->copied_seq += read;
1770                 csk_return_rx_credits(csk, read);
1771                 conn->rxdata_octets += read;
1772         }
1773
1774         if (err < 0) {
1775                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1776                         csk, conn, err, read);
1777                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1778         }
1779 }
1780 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1781
1782 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1783                                 unsigned int offset, unsigned int *off,
1784                                 struct scatterlist **sgp)
1785 {
1786         int i;
1787         struct scatterlist *sg;
1788
1789         for_each_sg(sgl, sg, sgcnt, i) {
1790                 if (offset < sg->length) {
1791                         *off = offset;
1792                         *sgp = sg;
1793                         return 0;
1794                 }
1795                 offset -= sg->length;
1796         }
1797         return -EFAULT;
1798 }
1799
1800 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1801                                 unsigned int dlen, skb_frag_t *frags,
1802                                 int frag_max)
1803 {
1804         unsigned int datalen = dlen;
1805         unsigned int sglen = sg->length - sgoffset;
1806         struct page *page = sg_page(sg);
1807         int i;
1808
1809         i = 0;
1810         do {
1811                 unsigned int copy;
1812
1813                 if (!sglen) {
1814                         sg = sg_next(sg);
1815                         if (!sg) {
1816                                 pr_warn("sg %d NULL, len %u/%u.\n",
1817                                         i, datalen, dlen);
1818                                 return -EINVAL;
1819                         }
1820                         sgoffset = 0;
1821                         sglen = sg->length;
1822                         page = sg_page(sg);
1823
1824                 }
1825                 copy = min(datalen, sglen);
1826                 if (i && page == frags[i - 1].page &&
1827                     sgoffset + sg->offset ==
1828                         frags[i - 1].page_offset + frags[i - 1].size) {
1829                         frags[i - 1].size += copy;
1830                 } else {
1831                         if (i >= frag_max) {
1832                                 pr_warn("too many pages %u, dlen %u.\n",
1833                                         frag_max, dlen);
1834                                 return -EINVAL;
1835                         }
1836
1837                         frags[i].page = page;
1838                         frags[i].page_offset = sg->offset + sgoffset;
1839                         frags[i].size = copy;
1840                         i++;
1841                 }
1842                 datalen -= copy;
1843                 sgoffset += copy;
1844                 sglen -= copy;
1845         } while (datalen);
1846
1847         return i;
1848 }
1849
1850 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1851 {
1852         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1853         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1854         struct cxgbi_device *cdev = cconn->chba->cdev;
1855         struct iscsi_conn *conn = task->conn;
1856         struct iscsi_tcp_task *tcp_task = task->dd_data;
1857         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1858         struct scsi_cmnd *sc = task->sc;
1859         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1860
1861         tcp_task->dd_data = tdata;
1862         task->hdr = NULL;
1863
1864         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1865             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1866              (opcode == ISCSI_OP_SCSI_CMD &&
1867               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1868                 /* data could goes into skb head */
1869                 headroom += min_t(unsigned int,
1870                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1871                                 conn->max_xmit_dlength);
1872
1873         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1874         if (!tdata->skb) {
1875                 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1876                         cdev->skb_tx_rsvd, headroom, opcode);
1877                 return -ENOMEM;
1878         }
1879
1880         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1881         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1882         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1883
1884         /* data_out uses scsi_cmd's itt */
1885         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1886                 task_reserve_itt(task, &task->hdr->itt);
1887
1888         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1889                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1890                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1891                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1892
1893         return 0;
1894 }
1895 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1896
1897 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1898 {
1899         if (hcrc || dcrc) {
1900                 u8 submode = 0;
1901
1902                 if (hcrc)
1903                         submode |= 1;
1904                 if (dcrc)
1905                         submode |= 2;
1906                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1907         } else
1908                 cxgbi_skcb_ulp_mode(skb) = 0;
1909 }
1910
1911 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1912                               unsigned int count)
1913 {
1914         struct iscsi_conn *conn = task->conn;
1915         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1916         struct sk_buff *skb = tdata->skb;
1917         unsigned int datalen = count;
1918         int i, padlen = iscsi_padding(count);
1919         struct page *pg;
1920
1921         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1922                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1923                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1924                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1925
1926         skb_put(skb, task->hdr_len);
1927         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1928         if (!count)
1929                 return 0;
1930
1931         if (task->sc) {
1932                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1933                 struct scatterlist *sg = NULL;
1934                 int err;
1935
1936                 tdata->offset = offset;
1937                 tdata->count = count;
1938                 err = sgl_seek_offset(
1939                                         sdb->table.sgl, sdb->table.nents,
1940                                         tdata->offset, &tdata->sgoffset, &sg);
1941                 if (err < 0) {
1942                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1943                                 sdb->table.nents, tdata->offset, sdb->length);
1944                         return err;
1945                 }
1946                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1947                                         tdata->frags, MAX_PDU_FRAGS);
1948                 if (err < 0) {
1949                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1950                                 sdb->table.nents, tdata->offset, tdata->count);
1951                         return err;
1952                 }
1953                 tdata->nr_frags = err;
1954
1955                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1956                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1957                         char *dst = skb->data + task->hdr_len;
1958                         skb_frag_t *frag = tdata->frags;
1959
1960                         /* data fits in the skb's headroom */
1961                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1962                                 char *src = kmap_atomic(frag->page,
1963                                                         KM_SOFTIRQ0);
1964
1965                                 memcpy(dst, src+frag->page_offset, frag->size);
1966                                 dst += frag->size;
1967                                 kunmap_atomic(src, KM_SOFTIRQ0);
1968                         }
1969                         if (padlen) {
1970                                 memset(dst, 0, padlen);
1971                                 padlen = 0;
1972                         }
1973                         skb_put(skb, count + padlen);
1974                 } else {
1975                         /* data fit into frag_list */
1976                         for (i = 0; i < tdata->nr_frags; i++)
1977                                 get_page(tdata->frags[i].page);
1978
1979                         memcpy(skb_shinfo(skb)->frags, tdata->frags,
1980                                 sizeof(skb_frag_t) * tdata->nr_frags);
1981                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1982                         skb->len += count;
1983                         skb->data_len += count;
1984                         skb->truesize += count;
1985                 }
1986
1987         } else {
1988                 pg = virt_to_page(task->data);
1989
1990                 get_page(pg);
1991                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1992                                         count);
1993                 skb->len += count;
1994                 skb->data_len += count;
1995                 skb->truesize += count;
1996         }
1997
1998         if (padlen) {
1999                 i = skb_shinfo(skb)->nr_frags;
2000                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2001                                 virt_to_page(padding), offset_in_page(padding),
2002                                 padlen);
2003
2004                 skb->data_len += padlen;
2005                 skb->truesize += padlen;
2006                 skb->len += padlen;
2007         }
2008
2009         return 0;
2010 }
2011 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2012
2013 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2014 {
2015         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2016         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2017         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2018         struct sk_buff *skb = tdata->skb;
2019         unsigned int datalen;
2020         int err;
2021
2022         if (!skb) {
2023                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2024                         "task 0x%p, skb NULL.\n", task);
2025                 return 0;
2026         }
2027
2028         datalen = skb->data_len;
2029         tdata->skb = NULL;
2030         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2031         if (err > 0) {
2032                 int pdulen = err;
2033
2034                 log_debug(1 << CXGBI_DBG_PDU_TX,
2035                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2036                         task, task->sc, skb, skb->len, skb->data_len, err);
2037
2038                 if (task->conn->hdrdgst_en)
2039                         pdulen += ISCSI_DIGEST_SIZE;
2040
2041                 if (datalen && task->conn->datadgst_en)
2042                         pdulen += ISCSI_DIGEST_SIZE;
2043
2044                 task->conn->txdata_octets += pdulen;
2045                 return 0;
2046         }
2047
2048         if (err == -EAGAIN || err == -ENOBUFS) {
2049                 log_debug(1 << CXGBI_DBG_PDU_TX,
2050                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2051                         task, skb, skb->len, skb->data_len, err);
2052                 /* reset skb to send when we are called again */
2053                 tdata->skb = skb;
2054                 return err;
2055         }
2056
2057         kfree_skb(skb);
2058         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2059                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2060                 task->itt, skb, skb->len, skb->data_len, err);
2061         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2062         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2063         return err;
2064 }
2065 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2066
2067 void cxgbi_cleanup_task(struct iscsi_task *task)
2068 {
2069         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2070
2071         log_debug(1 << CXGBI_DBG_ISCSI,
2072                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2073                 task, tdata->skb, task->hdr_itt);
2074
2075         /*  never reached the xmit task callout */
2076         if (tdata->skb)
2077                 __kfree_skb(tdata->skb);
2078         memset(tdata, 0, sizeof(*tdata));
2079
2080         task_release_itt(task, task->hdr_itt);
2081         iscsi_tcp_cleanup_task(task);
2082 }
2083 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2084
2085 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2086                                 struct iscsi_stats *stats)
2087 {
2088         struct iscsi_conn *conn = cls_conn->dd_data;
2089
2090         stats->txdata_octets = conn->txdata_octets;
2091         stats->rxdata_octets = conn->rxdata_octets;
2092         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2093         stats->dataout_pdus = conn->dataout_pdus_cnt;
2094         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2095         stats->datain_pdus = conn->datain_pdus_cnt;
2096         stats->r2t_pdus = conn->r2t_pdus_cnt;
2097         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2098         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2099         stats->digest_err = 0;
2100         stats->timeout_err = 0;
2101         stats->custom_length = 1;
2102         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2103         stats->custom[0].value = conn->eh_abort_cnt;
2104 }
2105 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2106
2107 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2108 {
2109         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2110         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2111         struct cxgbi_device *cdev = cconn->chba->cdev;
2112         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2113         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2114         unsigned int max = max(max_def, headroom);
2115
2116         max = min(cconn->chba->cdev->tx_max_size, max);
2117         if (conn->max_xmit_dlength)
2118                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2119         else
2120                 conn->max_xmit_dlength = max;
2121         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2122
2123         return 0;
2124 }
2125
2126 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2127 {
2128         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2129         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2130         unsigned int max = cconn->chba->cdev->rx_max_size;
2131
2132         cxgbi_align_pdu_size(max);
2133
2134         if (conn->max_recv_dlength) {
2135                 if (conn->max_recv_dlength > max) {
2136                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2137                                 conn->max_recv_dlength, max);
2138                         return -EINVAL;
2139                 }
2140                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2141                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2142         } else
2143                 conn->max_recv_dlength = max;
2144
2145         return 0;
2146 }
2147
2148 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2149                         enum iscsi_param param, char *buf, int buflen)
2150 {
2151         struct iscsi_conn *conn = cls_conn->dd_data;
2152         struct iscsi_session *session = conn->session;
2153         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2154         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2155         struct cxgbi_sock *csk = cconn->cep->csk;
2156         int value, err = 0;
2157
2158         log_debug(1 << CXGBI_DBG_ISCSI,
2159                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2160                 cls_conn, param, buflen, buf);
2161
2162         switch (param) {
2163         case ISCSI_PARAM_HDRDGST_EN:
2164                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2165                 if (!err && conn->hdrdgst_en)
2166                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2167                                                         conn->hdrdgst_en,
2168                                                         conn->datadgst_en, 0);
2169                 break;
2170         case ISCSI_PARAM_DATADGST_EN:
2171                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2172                 if (!err && conn->datadgst_en)
2173                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2174                                                         conn->hdrdgst_en,
2175                                                         conn->datadgst_en, 0);
2176                 break;
2177         case ISCSI_PARAM_MAX_R2T:
2178                 sscanf(buf, "%d", &value);
2179                 if (value <= 0 || !is_power_of_2(value))
2180                         return -EINVAL;
2181                 if (session->max_r2t == value)
2182                         break;
2183                 iscsi_tcp_r2tpool_free(session);
2184                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2185                 if (!err && iscsi_tcp_r2tpool_alloc(session))
2186                         return -ENOMEM;
2187         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2188                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2189                 if (!err)
2190                         err = cxgbi_conn_max_recv_dlength(conn);
2191                 break;
2192         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2193                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2194                 if (!err)
2195                         err = cxgbi_conn_max_xmit_dlength(conn);
2196                 break;
2197         default:
2198                 return iscsi_set_param(cls_conn, param, buf, buflen);
2199         }
2200         return err;
2201 }
2202 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2203
2204 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2205                        char *buf)
2206 {
2207         struct cxgbi_endpoint *cep = ep->dd_data;
2208         struct cxgbi_sock *csk;
2209         int len;
2210
2211         log_debug(1 << CXGBI_DBG_ISCSI,
2212                 "cls_conn 0x%p, param %d.\n", ep, param);
2213
2214         switch (param) {
2215         case ISCSI_PARAM_CONN_PORT:
2216         case ISCSI_PARAM_CONN_ADDRESS:
2217                 if (!cep)
2218                         return -ENOTCONN;
2219
2220                 csk = cep->csk;
2221                 if (!csk)
2222                         return -ENOTCONN;
2223
2224                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2225                                                  &csk->daddr, param, buf);
2226         default:
2227                 return -ENOSYS;
2228         }
2229         return len;
2230 }
2231 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2232
2233 struct iscsi_cls_conn *
2234 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2235 {
2236         struct iscsi_cls_conn *cls_conn;
2237         struct iscsi_conn *conn;
2238         struct iscsi_tcp_conn *tcp_conn;
2239         struct cxgbi_conn *cconn;
2240
2241         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2242         if (!cls_conn)
2243                 return NULL;
2244
2245         conn = cls_conn->dd_data;
2246         tcp_conn = conn->dd_data;
2247         cconn = tcp_conn->dd_data;
2248         cconn->iconn = conn;
2249
2250         log_debug(1 << CXGBI_DBG_ISCSI,
2251                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2252                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2253
2254         return cls_conn;
2255 }
2256 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2257
2258 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2259                                 struct iscsi_cls_conn *cls_conn,
2260                                 u64 transport_eph, int is_leading)
2261 {
2262         struct iscsi_conn *conn = cls_conn->dd_data;
2263         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2264         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2265         struct iscsi_endpoint *ep;
2266         struct cxgbi_endpoint *cep;
2267         struct cxgbi_sock *csk;
2268         int err;
2269
2270         ep = iscsi_lookup_endpoint(transport_eph);
2271         if (!ep)
2272                 return -EINVAL;
2273
2274         /*  setup ddp pagesize */
2275         cep = ep->dd_data;
2276         csk = cep->csk;
2277         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2278         if (err < 0)
2279                 return err;
2280
2281         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2282         if (err)
2283                 return -EINVAL;
2284
2285         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2286         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2287
2288         write_lock_bh(&csk->callback_lock);
2289         csk->user_data = conn;
2290         cconn->chba = cep->chba;
2291         cconn->cep = cep;
2292         cep->cconn = cconn;
2293         write_unlock_bh(&csk->callback_lock);
2294
2295         cxgbi_conn_max_xmit_dlength(conn);
2296         cxgbi_conn_max_recv_dlength(conn);
2297
2298         log_debug(1 << CXGBI_DBG_ISCSI,
2299                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2300                 cls_session, cls_conn, ep, cconn, csk);
2301         /*  init recv engine */
2302         iscsi_tcp_hdr_recv_prep(tcp_conn);
2303
2304         return 0;
2305 }
2306 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2307
2308 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2309                                                 u16 cmds_max, u16 qdepth,
2310                                                 u32 initial_cmdsn)
2311 {
2312         struct cxgbi_endpoint *cep;
2313         struct cxgbi_hba *chba;
2314         struct Scsi_Host *shost;
2315         struct iscsi_cls_session *cls_session;
2316         struct iscsi_session *session;
2317
2318         if (!ep) {
2319                 pr_err("missing endpoint.\n");
2320                 return NULL;
2321         }
2322
2323         cep = ep->dd_data;
2324         chba = cep->chba;
2325         shost = chba->shost;
2326
2327         BUG_ON(chba != iscsi_host_priv(shost));
2328
2329         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2330                                         cmds_max, 0,
2331                                         sizeof(struct iscsi_tcp_task) +
2332                                         sizeof(struct cxgbi_task_data),
2333                                         initial_cmdsn, ISCSI_MAX_TARGET);
2334         if (!cls_session)
2335                 return NULL;
2336
2337         session = cls_session->dd_data;
2338         if (iscsi_tcp_r2tpool_alloc(session))
2339                 goto remove_session;
2340
2341         log_debug(1 << CXGBI_DBG_ISCSI,
2342                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2343         return cls_session;
2344
2345 remove_session:
2346         iscsi_session_teardown(cls_session);
2347         return NULL;
2348 }
2349 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2350
2351 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2352 {
2353         log_debug(1 << CXGBI_DBG_ISCSI,
2354                 "cls sess 0x%p.\n", cls_session);
2355
2356         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2357         iscsi_session_teardown(cls_session);
2358 }
2359 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2360
2361 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2362                         char *buf, int buflen)
2363 {
2364         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2365
2366         if (!chba->ndev) {
2367                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2368                                 "netdev for host not set.\n");
2369                 return -ENODEV;
2370         }
2371
2372         log_debug(1 << CXGBI_DBG_ISCSI,
2373                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2374                 shost, chba, chba->ndev->name, param, buflen, buf);
2375
2376         switch (param) {
2377         case ISCSI_HOST_PARAM_IPADDRESS:
2378         {
2379                 __be32 addr = in_aton(buf);
2380                 log_debug(1 << CXGBI_DBG_ISCSI,
2381                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2382                 cxgbi_set_iscsi_ipv4(chba, addr);
2383                 return 0;
2384         }
2385         case ISCSI_HOST_PARAM_HWADDRESS:
2386         case ISCSI_HOST_PARAM_NETDEV_NAME:
2387                 return 0;
2388         default:
2389                 return iscsi_host_set_param(shost, param, buf, buflen);
2390         }
2391 }
2392 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2393
2394 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2395                         char *buf)
2396 {
2397         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2398         int len = 0;
2399
2400         if (!chba->ndev) {
2401                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2402                                 "netdev for host not set.\n");
2403                 return -ENODEV;
2404         }
2405
2406         log_debug(1 << CXGBI_DBG_ISCSI,
2407                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2408                 shost, chba, chba->ndev->name, param);
2409
2410         switch (param) {
2411         case ISCSI_HOST_PARAM_HWADDRESS:
2412                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2413                 break;
2414         case ISCSI_HOST_PARAM_NETDEV_NAME:
2415                 len = sprintf(buf, "%s\n", chba->ndev->name);
2416                 break;
2417         case ISCSI_HOST_PARAM_IPADDRESS:
2418         {
2419                 __be32 addr;
2420
2421                 addr = cxgbi_get_iscsi_ipv4(chba);
2422                 len = sprintf(buf, "%pI4", &addr);
2423                 log_debug(1 << CXGBI_DBG_ISCSI,
2424                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2425                 break;
2426         }
2427         default:
2428                 return iscsi_host_get_param(shost, param, buf);
2429         }
2430
2431         return len;
2432 }
2433 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2434
2435 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2436                                         struct sockaddr *dst_addr,
2437                                         int non_blocking)
2438 {
2439         struct iscsi_endpoint *ep;
2440         struct cxgbi_endpoint *cep;
2441         struct cxgbi_hba *hba = NULL;
2442         struct cxgbi_sock *csk;
2443         int err = -EINVAL;
2444
2445         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2446                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2447                 shost, non_blocking, dst_addr);
2448
2449         if (shost) {
2450                 hba = iscsi_host_priv(shost);
2451                 if (!hba) {
2452                         pr_info("shost 0x%p, priv NULL.\n", shost);
2453                         goto err_out;
2454                 }
2455         }
2456
2457         csk = cxgbi_check_route(dst_addr);
2458         if (IS_ERR(csk))
2459                 return (struct iscsi_endpoint *)csk;
2460         cxgbi_sock_get(csk);
2461
2462         if (!hba)
2463                 hba = csk->cdev->hbas[csk->port_id];
2464         else if (hba != csk->cdev->hbas[csk->port_id]) {
2465                 pr_info("Could not connect through requested host %u"
2466                         "hba 0x%p != 0x%p (%u).\n",
2467                         shost->host_no, hba,
2468                         csk->cdev->hbas[csk->port_id], csk->port_id);
2469                 err = -ENOSPC;
2470                 goto release_conn;
2471         }
2472
2473         err = sock_get_port(csk);
2474         if (err)
2475                 goto release_conn;
2476
2477         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2478         err = csk->cdev->csk_init_act_open(csk);
2479         if (err)
2480                 goto release_conn;
2481
2482         if (cxgbi_sock_is_closing(csk)) {
2483                 err = -ENOSPC;
2484                 pr_info("csk 0x%p is closing.\n", csk);
2485                 goto release_conn;
2486         }
2487
2488         ep = iscsi_create_endpoint(sizeof(*cep));
2489         if (!ep) {
2490                 err = -ENOMEM;
2491                 pr_info("iscsi alloc ep, OOM.\n");
2492                 goto release_conn;
2493         }
2494
2495         cep = ep->dd_data;
2496         cep->csk = csk;
2497         cep->chba = hba;
2498
2499         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2500                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2501                 ep, cep, csk, hba, hba->ndev->name);
2502         return ep;
2503
2504 release_conn:
2505         cxgbi_sock_put(csk);
2506         cxgbi_sock_closed(csk);
2507 err_out:
2508         return ERR_PTR(err);
2509 }
2510 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2511
2512 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2513 {
2514         struct cxgbi_endpoint *cep = ep->dd_data;
2515         struct cxgbi_sock *csk = cep->csk;
2516
2517         if (!cxgbi_sock_is_established(csk))
2518                 return 0;
2519         return 1;
2520 }
2521 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2522
2523 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2524 {
2525         struct cxgbi_endpoint *cep = ep->dd_data;
2526         struct cxgbi_conn *cconn = cep->cconn;
2527         struct cxgbi_sock *csk = cep->csk;
2528
2529         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2530                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2531                 ep, cep, cconn, csk, csk->state, csk->flags);
2532
2533         if (cconn && cconn->iconn) {
2534                 iscsi_suspend_tx(cconn->iconn);
2535                 write_lock_bh(&csk->callback_lock);
2536                 cep->csk->user_data = NULL;
2537                 cconn->cep = NULL;
2538                 write_unlock_bh(&csk->callback_lock);
2539         }
2540         iscsi_destroy_endpoint(ep);
2541
2542         if (likely(csk->state >= CTP_ESTABLISHED))
2543                 need_active_close(csk);
2544         else
2545                 cxgbi_sock_closed(csk);
2546
2547         cxgbi_sock_put(csk);
2548 }
2549 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2550
2551 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2552                         struct scsi_transport_template **stt)
2553 {
2554         *stt = iscsi_register_transport(itp);
2555         if (*stt == NULL) {
2556                 pr_err("unable to register %s transport 0x%p.\n",
2557                         itp->name, itp);
2558                 return -ENODEV;
2559         }
2560         log_debug(1 << CXGBI_DBG_ISCSI,
2561                 "%s, registered iscsi transport 0x%p.\n",
2562                 itp->name, stt);
2563         return 0;
2564 }
2565 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2566
2567 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2568                         struct scsi_transport_template **stt)
2569 {
2570         if (*stt) {
2571                 log_debug(1 << CXGBI_DBG_ISCSI,
2572                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2573                         itp, itp->name, *stt);
2574                 *stt = NULL;
2575                 iscsi_unregister_transport(itp);
2576         }
2577 }
2578 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2579
2580 static int __init libcxgbi_init_module(void)
2581 {
2582         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2583         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2584
2585         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2586                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2587                 ISCSI_AGE_MASK, sw_tag_age_bits);
2588
2589         ddp_setup_host_page_size();
2590         return 0;
2591 }
2592
2593 static void __exit libcxgbi_exit_module(void)
2594 {
2595         cxgbi_device_unregister_all(0xFF);
2596         return;
2597 }
2598
2599 module_init(libcxgbi_init_module);
2600 module_exit(libcxgbi_exit_module);