f76185b010dadd91d8e35861c135758c51ef3366
[linux-2.6.git] / drivers / scsi / cxgbi / cxgb3i / cxgb3i.c
1 /*
2  * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
3  *
4  * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
5  *
6  * This program is distributed in the hope that it will be useful, but WITHOUT
7  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8  * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
9  * release for licensing terms and conditions.
10  *
11  * Written by:  Dimitris Michailidis (dm@chelsio.com)
12  *              Karen Xie (kxie@chelsio.com)
13  */
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
16
17 #include <linux/version.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <scsi/scsi_host.h>
21
22 #include "common.h"
23 #include "t3_cpl.h"
24 #include "t3cdev.h"
25 #include "cxgb3_defs.h"
26 #include "cxgb3_ctl_defs.h"
27 #include "cxgb3_offload.h"
28 #include "firmware_exports.h"
29 #include "cxgb3i.h"
30
31 static unsigned int dbg_level;
32 #include "../libcxgbi.h"
33
34 #define DRV_MODULE_NAME         "cxgb3i"
35 #define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
36 #define DRV_MODULE_VERSION      "2.0.0"
37 #define DRV_MODULE_RELDATE      "Jun. 2010"
38
39 static char version[] =
40         DRV_MODULE_DESC " " DRV_MODULE_NAME
41         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
42
43 MODULE_AUTHOR("Chelsio Communications, Inc.");
44 MODULE_DESCRIPTION(DRV_MODULE_DESC);
45 MODULE_VERSION(DRV_MODULE_VERSION);
46 MODULE_LICENSE("GPL");
47
48 module_param(dbg_level, uint, 0644);
49 MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
50
51 static int cxgb3i_rcv_win = 256 * 1024;
52 module_param(cxgb3i_rcv_win, int, 0644);
53 MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
54
55 static int cxgb3i_snd_win = 128 * 1024;
56 module_param(cxgb3i_snd_win, int, 0644);
57 MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
58
59 static int cxgb3i_rx_credit_thres = 10 * 1024;
60 module_param(cxgb3i_rx_credit_thres, int, 0644);
61 MODULE_PARM_DESC(rx_credit_thres,
62                  "RX credits return threshold in bytes (default=10KB)");
63
64 static unsigned int cxgb3i_max_connect = 8 * 1024;
65 module_param(cxgb3i_max_connect, uint, 0644);
66 MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
67
68 static unsigned int cxgb3i_sport_base = 20000;
69 module_param(cxgb3i_sport_base, uint, 0644);
70 MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
71
72 static void cxgb3i_dev_open(struct t3cdev *);
73 static void cxgb3i_dev_close(struct t3cdev *);
74 static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
75
76 static struct cxgb3_client t3_client = {
77         .name = DRV_MODULE_NAME,
78         .handlers = cxgb3i_cpl_handlers,
79         .add = cxgb3i_dev_open,
80         .remove = cxgb3i_dev_close,
81         .event_handler = cxgb3i_dev_event_handler,
82 };
83
84 static struct scsi_host_template cxgb3i_host_template = {
85         .module         = THIS_MODULE,
86         .name           = DRV_MODULE_NAME,
87         .proc_name      = DRV_MODULE_NAME,
88         .can_queue      = CXGB3I_SCSI_HOST_QDEPTH,
89         .queuecommand   = iscsi_queuecommand,
90         .change_queue_depth = iscsi_change_queue_depth,
91         .sg_tablesize   = SG_ALL,
92         .max_sectors    = 0xFFFF,
93         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
94         .eh_abort_handler = iscsi_eh_abort,
95         .eh_device_reset_handler = iscsi_eh_device_reset,
96         .eh_target_reset_handler = iscsi_eh_recover_target,
97         .target_alloc   = iscsi_target_alloc,
98         .use_clustering = DISABLE_CLUSTERING,
99         .this_id        = -1,
100 };
101
102 static struct iscsi_transport cxgb3i_iscsi_transport = {
103         .owner          = THIS_MODULE,
104         .name           = DRV_MODULE_NAME,
105         /* owner and name should be set already */
106         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
107                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
108                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
109         .attr_is_visible        = cxgbi_attr_is_visible,
110         .get_host_param = cxgbi_get_host_param,
111         .set_host_param = cxgbi_set_host_param,
112         /* session management */
113         .create_session = cxgbi_create_session,
114         .destroy_session        = cxgbi_destroy_session,
115         .get_session_param = iscsi_session_get_param,
116         /* connection management */
117         .create_conn    = cxgbi_create_conn,
118         .bind_conn      = cxgbi_bind_conn,
119         .destroy_conn   = iscsi_tcp_conn_teardown,
120         .start_conn     = iscsi_conn_start,
121         .stop_conn      = iscsi_conn_stop,
122         .get_conn_param = iscsi_conn_get_param,
123         .set_param      = cxgbi_set_conn_param,
124         .get_stats      = cxgbi_get_conn_stats,
125         /* pdu xmit req from user space */
126         .send_pdu       = iscsi_conn_send_pdu,
127         /* task */
128         .init_task      = iscsi_tcp_task_init,
129         .xmit_task      = iscsi_tcp_task_xmit,
130         .cleanup_task   = cxgbi_cleanup_task,
131         /* pdu */
132         .alloc_pdu      = cxgbi_conn_alloc_pdu,
133         .init_pdu       = cxgbi_conn_init_pdu,
134         .xmit_pdu       = cxgbi_conn_xmit_pdu,
135         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
136         /* TCP connect/disconnect */
137         .get_ep_param   = cxgbi_get_ep_param,
138         .ep_connect     = cxgbi_ep_connect,
139         .ep_poll        = cxgbi_ep_poll,
140         .ep_disconnect  = cxgbi_ep_disconnect,
141         /* Error recovery timeout call */
142         .session_recovery_timedout = iscsi_session_recovery_timedout,
143 };
144
145 static struct scsi_transport_template *cxgb3i_stt;
146
147 /*
148  * CPL (Chelsio Protocol Language) defines a message passing interface between
149  * the host driver and Chelsio asic.
150  * The section below implments CPLs that related to iscsi tcp connection
151  * open/close/abort and data send/receive.
152  */
153
154 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
155
156 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
157                               const struct l2t_entry *e)
158 {
159         unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
160         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
161
162         skb->priority = CPL_PRIORITY_SETUP;
163
164         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
165         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
166         req->local_port = csk->saddr.sin_port;
167         req->peer_port = csk->daddr.sin_port;
168         req->local_ip = csk->saddr.sin_addr.s_addr;
169         req->peer_ip = csk->daddr.sin_addr.s_addr;
170
171         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
172                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
173                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
174         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
175                         V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
176
177         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
178                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
179                 csk, csk->state, csk->flags, csk->atid,
180                 &req->local_ip, ntohs(req->local_port),
181                 &req->peer_ip, ntohs(req->peer_port),
182                 csk->mss_idx, e->idx, e->smt_idx);
183
184         l2t_send(csk->cdev->lldev, skb, csk->l2t);
185 }
186
187 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
188 {
189         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
190 }
191
192 /*
193  * CPL connection close request: host ->
194  *
195  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
196  * the write queue (i.e., after any unsent txt data).
197  */
198 static void send_close_req(struct cxgbi_sock *csk)
199 {
200         struct sk_buff *skb = csk->cpl_close;
201         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
202         unsigned int tid = csk->tid;
203
204         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
205                 "csk 0x%p,%u,0x%lx,%u.\n",
206                 csk, csk->state, csk->flags, csk->tid);
207
208         csk->cpl_close = NULL;
209         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
210         req->wr.wr_lo = htonl(V_WR_TID(tid));
211         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
212         req->rsvd = htonl(csk->write_seq);
213
214         cxgbi_sock_skb_entail(csk, skb);
215         if (csk->state >= CTP_ESTABLISHED)
216                 push_tx_frames(csk, 1);
217 }
218
219 /*
220  * CPL connection abort request: host ->
221  *
222  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
223  * for the same connection and also that we do not try to send a message
224  * after the connection has closed.
225  */
226 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
227 {
228         struct cpl_abort_req *req = cplhdr(skb);
229
230         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
231                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
232                 tdev, GET_TID(req), skb);
233         req->cmd = CPL_ABORT_NO_RST;
234         cxgb3_ofld_send(tdev, skb);
235 }
236
237 static void send_abort_req(struct cxgbi_sock *csk)
238 {
239         struct sk_buff *skb = csk->cpl_abort_req;
240         struct cpl_abort_req *req;
241
242         if (unlikely(csk->state == CTP_ABORTING || !skb))
243                 return;
244         cxgbi_sock_set_state(csk, CTP_ABORTING);
245         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
246         /* Purge the send queue so we don't send anything after an abort. */
247         cxgbi_sock_purge_write_queue(csk);
248
249         csk->cpl_abort_req = NULL;
250         req = (struct cpl_abort_req *)skb->head;
251         skb->priority = CPL_PRIORITY_DATA;
252         set_arp_failure_handler(skb, abort_arp_failure);
253         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
254         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
255         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
256         req->rsvd0 = htonl(csk->snd_nxt);
257         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
258         req->cmd = CPL_ABORT_SEND_RST;
259
260         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
261                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
262                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
263                 req->rsvd1);
264
265         l2t_send(csk->cdev->lldev, skb, csk->l2t);
266 }
267
268 /*
269  * CPL connection abort reply: host ->
270  *
271  * Send an ABORT_RPL message in response of the ABORT_REQ received.
272  */
273 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
274 {
275         struct sk_buff *skb = csk->cpl_abort_rpl;
276         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
277
278         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
279                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
280                 csk, csk->state, csk->flags, csk->tid, rst_status);
281
282         csk->cpl_abort_rpl = NULL;
283         skb->priority = CPL_PRIORITY_DATA;
284         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
285         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
286         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
287         rpl->cmd = rst_status;
288         cxgb3_ofld_send(csk->cdev->lldev, skb);
289 }
290
291 /*
292  * CPL connection rx data ack: host ->
293  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
294  * credits sent.
295  */
296 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
297 {
298         struct sk_buff *skb;
299         struct cpl_rx_data_ack *req;
300         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
301
302         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
303                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
304                 csk, csk->state, csk->flags, csk->tid, credits, dack);
305
306         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
307         if (!skb) {
308                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
309                 return 0;
310         }
311         req = (struct cpl_rx_data_ack *)skb->head;
312         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
313         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
314         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
315                                 V_RX_CREDITS(credits));
316         skb->priority = CPL_PRIORITY_ACK;
317         cxgb3_ofld_send(csk->cdev->lldev, skb);
318         return credits;
319 }
320
321 /*
322  * CPL connection tx data: host ->
323  *
324  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
325  * credits sent.
326  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
327  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
328  */
329
330 static unsigned int wrlen __read_mostly;
331 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
332
333 static void init_wr_tab(unsigned int wr_len)
334 {
335         int i;
336
337         if (skb_wrs[1])         /* already initialized */
338                 return;
339         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
340                 int sgl_len = (3 * i) / 2 + (i & 1);
341
342                 sgl_len += 3;
343                 skb_wrs[i] = (sgl_len <= wr_len
344                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
345         }
346         wrlen = wr_len * 8;
347 }
348
349 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
350                                    int len, int req_completion)
351 {
352         struct tx_data_wr *req;
353         struct l2t_entry *l2t = csk->l2t;
354
355         skb_reset_transport_header(skb);
356         req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
357         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
358                         (req_completion ? F_WR_COMPL : 0));
359         req->wr_lo = htonl(V_WR_TID(csk->tid));
360         /* len includes the length of any HW ULP additions */
361         req->len = htonl(len);
362         /* V_TX_ULP_SUBMODE sets both the mode and submode */
363         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
364                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
365         req->sndseq = htonl(csk->snd_nxt);
366         req->param = htonl(V_TX_PORT(l2t->smt_idx));
367
368         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
369                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
370                                     V_TX_CPU_IDX(csk->rss_qid));
371                 /* sendbuffer is in units of 32KB. */
372                 req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
373                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
374         }
375 }
376
377 /**
378  * push_tx_frames -- start transmit
379  * @c3cn: the offloaded connection
380  * @req_completion: request wr_ack or not
381  *
382  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
383  * connection's send queue and sends them on to T3.  Must be called with the
384  * connection's lock held.  Returns the amount of send buffer space that was
385  * freed as a result of sending queued data to T3.
386  */
387
388 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
389 {
390         kfree_skb(skb);
391 }
392
393 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
394 {
395         int total_size = 0;
396         struct sk_buff *skb;
397
398         if (unlikely(csk->state < CTP_ESTABLISHED ||
399                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
400                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
401                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
402                                 csk, csk->state, csk->flags, csk->tid);
403                 return 0;
404         }
405
406         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
407                 int len = skb->len;     /* length before skb_push */
408                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
409                 int wrs_needed = skb_wrs[frags];
410
411                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
412                         wrs_needed = 1;
413
414                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
415
416                 if (csk->wr_cred < wrs_needed) {
417                         log_debug(1 << CXGBI_DBG_PDU_TX,
418                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
419                                 csk, skb->len, skb->data_len, frags,
420                                 wrs_needed, csk->wr_cred);
421                         break;
422                 }
423
424                 __skb_unlink(skb, &csk->write_queue);
425                 skb->priority = CPL_PRIORITY_DATA;
426                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
427                 csk->wr_cred -= wrs_needed;
428                 csk->wr_una_cred += wrs_needed;
429                 cxgbi_sock_enqueue_wr(csk, skb);
430
431                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
432                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
433                         "left %u, unack %u.\n",
434                         csk, skb->len, skb->data_len, frags, skb->csum,
435                         csk->wr_cred, csk->wr_una_cred);
436
437                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
438                         if ((req_completion &&
439                                 csk->wr_una_cred == wrs_needed) ||
440                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
441                                 req_completion = 1;
442                                 csk->wr_una_cred = 0;
443                         }
444                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
445                         make_tx_data_wr(csk, skb, len, req_completion);
446                         csk->snd_nxt += len;
447                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
448                 }
449                 total_size += skb->truesize;
450                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
451                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
452                         csk, csk->tid, skb);
453                 set_arp_failure_handler(skb, arp_failure_skb_discard);
454                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
455         }
456         return total_size;
457 }
458
459 /*
460  * Process a CPL_ACT_ESTABLISH message: -> host
461  * Updates connection state from an active establish CPL message.  Runs with
462  * the connection lock held.
463  */
464
465 static inline void free_atid(struct cxgbi_sock *csk)
466 {
467         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
468                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
469                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
470                 cxgbi_sock_put(csk);
471         }
472 }
473
474 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
475 {
476         struct cxgbi_sock *csk = ctx;
477         struct cpl_act_establish *req = cplhdr(skb);
478         unsigned int tid = GET_TID(req);
479         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
480         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
481
482         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
483                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
484                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
485
486         cxgbi_sock_get(csk);
487         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
488         csk->tid = tid;
489         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
490
491         free_atid(csk);
492
493         csk->rss_qid = G_QNUM(ntohs(skb->csum));
494
495         spin_lock_bh(&csk->lock);
496         if (csk->retry_timer.function) {
497                 del_timer(&csk->retry_timer);
498                 csk->retry_timer.function = NULL;
499         }
500
501         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
502                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
503                         csk, csk->state, csk->flags, csk->tid);
504
505         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
506         if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
507                 csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
508
509         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
510
511         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
512                 /* upper layer has requested closing */
513                 send_abort_req(csk);
514         else {
515                 if (skb_queue_len(&csk->write_queue))
516                         push_tx_frames(csk, 1);
517                 cxgbi_conn_tx_open(csk);
518         }
519
520         spin_unlock_bh(&csk->lock);
521         __kfree_skb(skb);
522         return 0;
523 }
524
525 /*
526  * Process a CPL_ACT_OPEN_RPL message: -> host
527  * Handle active open failures.
528  */
529 static int act_open_rpl_status_to_errno(int status)
530 {
531         switch (status) {
532         case CPL_ERR_CONN_RESET:
533                 return -ECONNREFUSED;
534         case CPL_ERR_ARP_MISS:
535                 return -EHOSTUNREACH;
536         case CPL_ERR_CONN_TIMEDOUT:
537                 return -ETIMEDOUT;
538         case CPL_ERR_TCAM_FULL:
539                 return -ENOMEM;
540         case CPL_ERR_CONN_EXIST:
541                 return -EADDRINUSE;
542         default:
543                 return -EIO;
544         }
545 }
546
547 static void act_open_retry_timer(unsigned long data)
548 {
549         struct sk_buff *skb;
550         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
551
552         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
553                 "csk 0x%p,%u,0x%lx,%u.\n",
554                 csk, csk->state, csk->flags, csk->tid);
555
556         cxgbi_sock_get(csk);
557         spin_lock_bh(&csk->lock);
558         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
559         if (!skb)
560                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
561         else {
562                 skb->sk = (struct sock *)csk;
563                 set_arp_failure_handler(skb, act_open_arp_failure);
564                 send_act_open_req(csk, skb, csk->l2t);
565         }
566         spin_unlock_bh(&csk->lock);
567         cxgbi_sock_put(csk);
568 }
569
570 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
571 {
572         struct cxgbi_sock *csk = ctx;
573         struct cpl_act_open_rpl *rpl = cplhdr(skb);
574
575         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
576                 csk, csk->state, csk->flags, csk->atid, rpl->status,
577                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
578                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
579
580         if (rpl->status != CPL_ERR_TCAM_FULL &&
581             rpl->status != CPL_ERR_CONN_EXIST &&
582             rpl->status != CPL_ERR_ARP_MISS)
583                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
584
585         cxgbi_sock_get(csk);
586         spin_lock_bh(&csk->lock);
587         if (rpl->status == CPL_ERR_CONN_EXIST &&
588             csk->retry_timer.function != act_open_retry_timer) {
589                 csk->retry_timer.function = act_open_retry_timer;
590                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
591         } else
592                 cxgbi_sock_fail_act_open(csk,
593                                 act_open_rpl_status_to_errno(rpl->status));
594
595         spin_unlock_bh(&csk->lock);
596         cxgbi_sock_put(csk);
597         __kfree_skb(skb);
598         return 0;
599 }
600
601 /*
602  * Process PEER_CLOSE CPL messages: -> host
603  * Handle peer FIN.
604  */
605 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
606 {
607         struct cxgbi_sock *csk = ctx;
608
609         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
610                 "csk 0x%p,%u,0x%lx,%u.\n",
611                 csk, csk->state, csk->flags, csk->tid);
612
613         cxgbi_sock_rcv_peer_close(csk);
614         __kfree_skb(skb);
615         return 0;
616 }
617
618 /*
619  * Process CLOSE_CONN_RPL CPL message: -> host
620  * Process a peer ACK to our FIN.
621  */
622 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
623                             void *ctx)
624 {
625         struct cxgbi_sock *csk = ctx;
626         struct cpl_close_con_rpl *rpl = cplhdr(skb);
627
628         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
629                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
630                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
631
632         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
633         __kfree_skb(skb);
634         return 0;
635 }
636
637 /*
638  * Process ABORT_REQ_RSS CPL message: -> host
639  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
640  * request except that we need to reply to it.
641  */
642
643 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
644                                  int *need_rst)
645 {
646         switch (abort_reason) {
647         case CPL_ERR_BAD_SYN: /* fall through */
648         case CPL_ERR_CONN_RESET:
649                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
650         case CPL_ERR_XMIT_TIMEDOUT:
651         case CPL_ERR_PERSIST_TIMEDOUT:
652         case CPL_ERR_FINWAIT2_TIMEDOUT:
653         case CPL_ERR_KEEPALIVE_TIMEDOUT:
654                 return -ETIMEDOUT;
655         default:
656                 return -EIO;
657         }
658 }
659
660 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
661 {
662         const struct cpl_abort_req_rss *req = cplhdr(skb);
663         struct cxgbi_sock *csk = ctx;
664         int rst_status = CPL_ABORT_NO_RST;
665
666         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
667                 "csk 0x%p,%u,0x%lx,%u.\n",
668                 csk, csk->state, csk->flags, csk->tid);
669
670         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
671             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
672                 goto done;
673         }
674
675         cxgbi_sock_get(csk);
676         spin_lock_bh(&csk->lock);
677
678         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
679                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
680                 cxgbi_sock_set_state(csk, CTP_ABORTING);
681                 goto out;
682         }
683
684         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
685         send_abort_rpl(csk, rst_status);
686
687         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
688                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
689                 cxgbi_sock_closed(csk);
690         }
691
692 out:
693         spin_unlock_bh(&csk->lock);
694         cxgbi_sock_put(csk);
695 done:
696         __kfree_skb(skb);
697         return 0;
698 }
699
700 /*
701  * Process ABORT_RPL_RSS CPL message: -> host
702  * Process abort replies.  We only process these messages if we anticipate
703  * them as the coordination between SW and HW in this area is somewhat lacking
704  * and sometimes we get ABORT_RPLs after we are done with the connection that
705  * originated the ABORT_REQ.
706  */
707 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
708 {
709         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
710         struct cxgbi_sock *csk = ctx;
711
712         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
713                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
714                 rpl->status, csk, csk ? csk->state : 0,
715                 csk ? csk->flags : 0UL);
716         /*
717          * Ignore replies to post-close aborts indicating that the abort was
718          * requested too late.  These connections are terminated when we get
719          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
720          * arrives the TID is either no longer used or it has been recycled.
721          */
722         if (rpl->status == CPL_ERR_ABORT_FAILED)
723                 goto rel_skb;
724         /*
725          * Sometimes we've already closed the connection, e.g., a post-close
726          * abort races with ABORT_REQ_RSS, the latter frees the connection
727          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
728          * but FW turns the ABORT_REQ into a regular one and so we get
729          * ABORT_RPL_RSS with status 0 and no connection.
730          */
731         if (csk)
732                 cxgbi_sock_rcv_abort_rpl(csk);
733 rel_skb:
734         __kfree_skb(skb);
735         return 0;
736 }
737
738 /*
739  * Process RX_ISCSI_HDR CPL message: -> host
740  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
741  * follow after the bhs.
742  */
743 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
744 {
745         struct cxgbi_sock *csk = ctx;
746         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
747         struct cpl_iscsi_hdr_norss data_cpl;
748         struct cpl_rx_data_ddp_norss ddp_cpl;
749         unsigned int hdr_len, data_len, status;
750         unsigned int len;
751         int err;
752
753         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
754                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
755                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
756
757         spin_lock_bh(&csk->lock);
758
759         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
760                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
761                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
762                         csk, csk->state, csk->flags, csk->tid);
763                 if (csk->state != CTP_ABORTING)
764                         goto abort_conn;
765                 else
766                         goto discard;
767         }
768
769         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
770         cxgbi_skcb_flags(skb) = 0;
771
772         skb_reset_transport_header(skb);
773         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
774
775         len = hdr_len = ntohs(hdr_cpl->len);
776         /* msg coalesce is off or not enough data received */
777         if (skb->len <= hdr_len) {
778                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
779                         csk->cdev->ports[csk->port_id]->name, csk->tid,
780                         skb->len, hdr_len);
781                 goto abort_conn;
782         }
783         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
784
785         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
786                             sizeof(ddp_cpl));
787         if (err < 0) {
788                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
789                         csk->cdev->ports[csk->port_id]->name, csk->tid,
790                         skb->len, sizeof(ddp_cpl), err);
791                 goto abort_conn;
792         }
793
794         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
795         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
796         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
797         status = ntohl(ddp_cpl.ddp_status);
798
799         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
800                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
801                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
802
803         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
804                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
805         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
806                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
807         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
808                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
809
810         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
811                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
812                 if (err < 0) {
813                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
814                                 csk->cdev->ports[csk->port_id]->name,
815                                 csk->tid, sizeof(data_cpl), skb->len, err);
816                         goto abort_conn;
817                 }
818                 data_len = ntohs(data_cpl.len);
819                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
820                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
821                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
822                 len += sizeof(data_cpl) + data_len;
823         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
824                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
825
826         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
827         __pskb_trim(skb, len);
828         __skb_queue_tail(&csk->receive_queue, skb);
829         cxgbi_conn_pdu_ready(csk);
830
831         spin_unlock_bh(&csk->lock);
832         return 0;
833
834 abort_conn:
835         send_abort_req(csk);
836 discard:
837         spin_unlock_bh(&csk->lock);
838         __kfree_skb(skb);
839         return 0;
840 }
841
842 /*
843  * Process TX_DATA_ACK CPL messages: -> host
844  * Process an acknowledgment of WR completion.  Advance snd_una and send the
845  * next batch of work requests from the write queue.
846  */
847 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
848 {
849         struct cxgbi_sock *csk = ctx;
850         struct cpl_wr_ack *hdr = cplhdr(skb);
851
852         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
853                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
854                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
855
856         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
857         __kfree_skb(skb);
858         return 0;
859 }
860
861 /*
862  * for each connection, pre-allocate skbs needed for close/abort requests. So
863  * that we can service the request right away.
864  */
865 static int alloc_cpls(struct cxgbi_sock *csk)
866 {
867         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
868                                         GFP_KERNEL);
869         if (!csk->cpl_close)
870                 return -ENOMEM;
871         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
872                                         GFP_KERNEL);
873         if (!csk->cpl_abort_req)
874                 goto free_cpl_skbs;
875
876         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
877                                         GFP_KERNEL);
878         if (!csk->cpl_abort_rpl)
879                 goto free_cpl_skbs;
880
881         return 0;
882
883 free_cpl_skbs:
884         cxgbi_sock_free_cpl_skbs(csk);
885         return -ENOMEM;
886 }
887
888 /**
889  * release_offload_resources - release offload resource
890  * @c3cn: the offloaded iscsi tcp connection.
891  * Release resources held by an offload connection (TID, L2T entry, etc.)
892  */
893 static void l2t_put(struct cxgbi_sock *csk)
894 {
895         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
896
897         if (csk->l2t) {
898                 l2t_release(L2DATA(t3dev), csk->l2t);
899                 csk->l2t = NULL;
900                 cxgbi_sock_put(csk);
901         }
902 }
903
904 static void release_offload_resources(struct cxgbi_sock *csk)
905 {
906         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
907
908         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
909                 "csk 0x%p,%u,0x%lx,%u.\n",
910                 csk, csk->state, csk->flags, csk->tid);
911
912         csk->rss_qid = 0;
913         cxgbi_sock_free_cpl_skbs(csk);
914
915         if (csk->wr_cred != csk->wr_max_cred) {
916                 cxgbi_sock_purge_wr_queue(csk);
917                 cxgbi_sock_reset_wr_list(csk);
918         }
919         l2t_put(csk);
920         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
921                 free_atid(csk);
922         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
923                 cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
924                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
925                 cxgbi_sock_put(csk);
926         }
927         csk->dst = NULL;
928         csk->cdev = NULL;
929 }
930
931 static void update_address(struct cxgbi_hba *chba)
932 {
933         if (chba->ipv4addr) {
934                 if (chba->vdev &&
935                     chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
936                         cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
937                         cxgb3i_set_private_ipv4addr(chba->ndev, 0);
938                         pr_info("%s set %pI4.\n",
939                                 chba->vdev->name, &chba->ipv4addr);
940                 } else if (chba->ipv4addr !=
941                                 cxgb3i_get_private_ipv4addr(chba->ndev)) {
942                         cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
943                         pr_info("%s set %pI4.\n",
944                                 chba->ndev->name, &chba->ipv4addr);
945                 }
946         } else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
947                 if (chba->vdev)
948                         cxgb3i_set_private_ipv4addr(chba->vdev, 0);
949                 cxgb3i_set_private_ipv4addr(chba->ndev, 0);
950         }
951 }
952
953 static int init_act_open(struct cxgbi_sock *csk)
954 {
955         struct dst_entry *dst = csk->dst;
956         struct cxgbi_device *cdev = csk->cdev;
957         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
958         struct net_device *ndev = cdev->ports[csk->port_id];
959         struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
960         struct sk_buff *skb = NULL;
961
962         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
963                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
964
965         update_address(chba);
966         if (chba->ipv4addr)
967                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
968
969         csk->rss_qid = 0;
970         csk->l2t = t3_l2t_get(t3dev, dst_get_neighbour(dst), ndev);
971         if (!csk->l2t) {
972                 pr_err("NO l2t available.\n");
973                 return -EINVAL;
974         }
975         cxgbi_sock_get(csk);
976
977         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
978         if (csk->atid < 0) {
979                 pr_err("NO atid available.\n");
980                 goto rel_resource;
981         }
982         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
983         cxgbi_sock_get(csk);
984
985         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
986         if (!skb)
987                 goto rel_resource;
988         skb->sk = (struct sock *)csk;
989         set_arp_failure_handler(skb, act_open_arp_failure);
990
991         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
992         csk->wr_una_cred = 0;
993         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
994         cxgbi_sock_reset_wr_list(csk);
995         csk->err = 0;
996
997         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
998                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
999                 csk, csk->state, csk->flags,
1000                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1001                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1002
1003         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1004         send_act_open_req(csk, skb, csk->l2t);
1005         return 0;
1006
1007 rel_resource:
1008         if (skb)
1009                 __kfree_skb(skb);
1010         return -EINVAL;
1011 }
1012
1013 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1014         [CPL_ACT_ESTABLISH] = do_act_establish,
1015         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1016         [CPL_PEER_CLOSE] = do_peer_close,
1017         [CPL_ABORT_REQ_RSS] = do_abort_req,
1018         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1019         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1020         [CPL_TX_DMA_ACK] = do_wr_ack,
1021         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1022 };
1023
1024 /**
1025  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1026  * @cdev:       cxgbi adapter
1027  */
1028 int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1029 {
1030         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1031         struct adap_ports port;
1032         struct ofld_page_info rx_page_info;
1033         unsigned int wr_len;
1034         int rc;
1035
1036         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1037             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1038             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1039                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1040                 return -EINVAL;
1041         }
1042
1043         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1044                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1045
1046         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1047                                         cxgb3i_max_connect);
1048         if (rc < 0)
1049                 return rc;
1050
1051         init_wr_tab(wr_len);
1052         cdev->csk_release_offload_resources = release_offload_resources;
1053         cdev->csk_push_tx_frames = push_tx_frames;
1054         cdev->csk_send_abort_req = send_abort_req;
1055         cdev->csk_send_close_req = send_close_req;
1056         cdev->csk_send_rx_credits = send_rx_credits;
1057         cdev->csk_alloc_cpls = alloc_cpls;
1058         cdev->csk_init_act_open = init_act_open;
1059
1060         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1061         return 0;
1062 }
1063
1064 /*
1065  * functions to program the pagepod in h/w
1066  */
1067 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1068 {
1069         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1070
1071         memset(req, 0, sizeof(*req));
1072
1073         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1074         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1075                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1076         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
1077                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
1078 }
1079
1080 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1081                         unsigned int idx, unsigned int npods,
1082                                 struct cxgbi_gather_list *gl)
1083 {
1084         struct cxgbi_device *cdev = csk->cdev;
1085         struct cxgbi_ddp_info *ddp = cdev->ddp;
1086         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1087         int i;
1088
1089         log_debug(1 << CXGBI_DBG_DDP,
1090                 "csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
1091                 csk, idx, npods, gl);
1092
1093         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1094                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1095                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1096
1097                 if (!skb)
1098                         return -ENOMEM;
1099
1100                 ulp_mem_io_set_hdr(skb, pm_addr);
1101                 cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
1102                                         sizeof(struct ulp_mem_io)),
1103                                    hdr, gl, i * PPOD_PAGES_MAX);
1104                 skb->priority = CPL_PRIORITY_CONTROL;
1105                 cxgb3_ofld_send(cdev->lldev, skb);
1106         }
1107         return 0;
1108 }
1109
1110 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1111                           unsigned int idx, unsigned int npods)
1112 {
1113         struct cxgbi_device *cdev = chba->cdev;
1114         struct cxgbi_ddp_info *ddp = cdev->ddp;
1115         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1116         int i;
1117
1118         log_debug(1 << CXGBI_DBG_DDP,
1119                 "cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
1120                 cdev, idx, npods, tag);
1121
1122         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1123                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1124                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1125
1126                 if (!skb) {
1127                         pr_err("tag 0x%x, 0x%x, %d/%u, skb OOM.\n",
1128                                 tag, idx, i, npods);
1129                         continue;
1130                 }
1131                 ulp_mem_io_set_hdr(skb, pm_addr);
1132                 skb->priority = CPL_PRIORITY_CONTROL;
1133                 cxgb3_ofld_send(cdev->lldev, skb);
1134         }
1135 }
1136
1137 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1138                                        unsigned int tid, int pg_idx, bool reply)
1139 {
1140         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1141                                         GFP_KERNEL);
1142         struct cpl_set_tcb_field *req;
1143         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1144
1145         log_debug(1 << CXGBI_DBG_DDP,
1146                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1147         if (!skb)
1148                 return -ENOMEM;
1149
1150         /* set up ulp submode and page size */
1151         req = (struct cpl_set_tcb_field *)skb->head;
1152         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1153         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1154         req->reply = V_NO_REPLY(reply ? 0 : 1);
1155         req->cpu_idx = 0;
1156         req->word = htons(31);
1157         req->mask = cpu_to_be64(0xF0000000);
1158         req->val = cpu_to_be64(val << 28);
1159         skb->priority = CPL_PRIORITY_CONTROL;
1160
1161         cxgb3_ofld_send(csk->cdev->lldev, skb);
1162         return 0;
1163 }
1164
1165 /**
1166  * cxgb3i_setup_conn_digest - setup conn. digest setting
1167  * @csk: cxgb tcp socket
1168  * @tid: connection id
1169  * @hcrc: header digest enabled
1170  * @dcrc: data digest enabled
1171  * @reply: request reply from h/w
1172  * set up the iscsi digest settings for a connection identified by tid
1173  */
1174 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1175                              int hcrc, int dcrc, int reply)
1176 {
1177         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1178                                         GFP_KERNEL);
1179         struct cpl_set_tcb_field *req;
1180         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1181
1182         log_debug(1 << CXGBI_DBG_DDP,
1183                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1184         if (!skb)
1185                 return -ENOMEM;
1186
1187         /* set up ulp submode and page size */
1188         req = (struct cpl_set_tcb_field *)skb->head;
1189         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1190         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1191         req->reply = V_NO_REPLY(reply ? 0 : 1);
1192         req->cpu_idx = 0;
1193         req->word = htons(31);
1194         req->mask = cpu_to_be64(0x0F000000);
1195         req->val = cpu_to_be64(val << 24);
1196         skb->priority = CPL_PRIORITY_CONTROL;
1197
1198         cxgb3_ofld_send(csk->cdev->lldev, skb);
1199         return 0;
1200 }
1201
1202 /**
1203  * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
1204  * @cdev: cxgb3i adapter
1205  * release all the resource held by the ddp pagepod manager for a given
1206  * adapter if needed
1207  */
1208
1209 static void t3_ddp_cleanup(struct cxgbi_device *cdev)
1210 {
1211         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1212
1213         if (cxgbi_ddp_cleanup(cdev)) {
1214                 pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
1215                 tdev->ulp_iscsi = NULL;
1216         }
1217 }
1218
1219 /**
1220  * ddp_init - initialize the cxgb3 adapter's ddp resource
1221  * @cdev: cxgb3i adapter
1222  * initialize the ddp pagepod manager for a given adapter
1223  */
1224 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1225 {
1226         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1227         struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
1228         struct ulp_iscsi_info uinfo;
1229         unsigned int pgsz_factor[4];
1230         int i, err;
1231
1232         if (ddp) {
1233                 kref_get(&ddp->refcnt);
1234                 pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
1235                         tdev, tdev->ulp_iscsi);
1236                 cdev->ddp = ddp;
1237                 return -EALREADY;
1238         }
1239
1240         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1241         if (err < 0) {
1242                 pr_err("%s, failed to get iscsi param err=%d.\n",
1243                          tdev->name, err);
1244                 return err;
1245         }
1246
1247         err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
1248                         uinfo.max_txsz, uinfo.max_rxsz);
1249         if (err < 0)
1250                 return err;
1251
1252         ddp = cdev->ddp;
1253
1254         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1255         cxgbi_ddp_page_size_factor(pgsz_factor);
1256         for (i = 0; i < 4; i++)
1257                 uinfo.pgsz_factor[i] = pgsz_factor[i];
1258         uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
1259
1260         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1261         if (err < 0) {
1262                 pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
1263                         tdev->name, err);
1264                 cxgbi_ddp_cleanup(cdev);
1265                 return err;
1266         }
1267         tdev->ulp_iscsi = ddp;
1268
1269         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1270         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1271         cdev->csk_ddp_set = ddp_set_map;
1272         cdev->csk_ddp_clear = ddp_clear_map;
1273
1274         pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1275                 "%u/%u.\n",
1276                 tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1277                 ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
1278                 ddp->max_rxsz, uinfo.max_rxsz);
1279         return 0;
1280 }
1281
1282 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1283 {
1284         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1285
1286         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1287                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1288                 return;
1289         }
1290
1291         cxgbi_device_unregister(cdev);
1292 }
1293
1294 /**
1295  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1296  * @t3dev: t3cdev adapter
1297  */
1298 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1299 {
1300         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1301         struct adapter *adapter = tdev2adap(t3dev);
1302         int i, err;
1303
1304         if (cdev) {
1305                 pr_info("0x%p, updating.\n", cdev);
1306                 return;
1307         }
1308
1309         cdev = cxgbi_device_register(0, adapter->params.nports);
1310         if (!cdev) {
1311                 pr_warn("device 0x%p register failed.\n", t3dev);
1312                 return;
1313         }
1314
1315         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1316         cdev->lldev = t3dev;
1317         cdev->pdev = adapter->pdev;
1318         cdev->ports = adapter->port;
1319         cdev->nports = adapter->params.nports;
1320         cdev->mtus = adapter->params.mtus;
1321         cdev->nmtus = NMTUS;
1322         cdev->snd_win = cxgb3i_snd_win;
1323         cdev->rcv_win = cxgb3i_rcv_win;
1324         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1325         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1326         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1327         cdev->dev_ddp_cleanup = t3_ddp_cleanup;
1328         cdev->itp = &cxgb3i_iscsi_transport;
1329
1330         err = cxgb3i_ddp_init(cdev);
1331         if (err) {
1332                 pr_info("0x%p ddp init failed\n", cdev);
1333                 goto err_out;
1334         }
1335
1336         err = cxgb3i_ofld_init(cdev);
1337         if (err) {
1338                 pr_info("0x%p offload init failed\n", cdev);
1339                 goto err_out;
1340         }
1341
1342         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1343                                 &cxgb3i_host_template, cxgb3i_stt);
1344         if (err)
1345                 goto err_out;
1346
1347         for (i = 0; i < cdev->nports; i++)
1348                 cdev->hbas[i]->ipv4addr =
1349                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1350
1351         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1352                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1353         return;
1354
1355 err_out:
1356         cxgbi_device_unregister(cdev);
1357 }
1358
1359 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1360 {
1361         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1362
1363         log_debug(1 << CXGBI_DBG_TOE,
1364                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1365                 t3dev, cdev, event, port);
1366         if (!cdev)
1367                 return;
1368
1369         switch (event) {
1370         case OFFLOAD_STATUS_DOWN:
1371                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1372                 break;
1373         case OFFLOAD_STATUS_UP:
1374                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1375                 break;
1376         }
1377 }
1378
1379 /**
1380  * cxgb3i_init_module - module init entry point
1381  *
1382  * initialize any driver wide global data structures and register itself
1383  *      with the cxgb3 module
1384  */
1385 static int __init cxgb3i_init_module(void)
1386 {
1387         int rc;
1388
1389         printk(KERN_INFO "%s", version);
1390
1391         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1392         if (rc < 0)
1393                 return rc;
1394
1395         cxgb3_register_client(&t3_client);
1396         return 0;
1397 }
1398
1399 /**
1400  * cxgb3i_exit_module - module cleanup/exit entry point
1401  *
1402  * go through the driver hba list and for each hba, release any resource held.
1403  *      and unregisters iscsi transport and the cxgb3 module
1404  */
1405 static void __exit cxgb3i_exit_module(void)
1406 {
1407         cxgb3_unregister_client(&t3_client);
1408         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1409         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1410 }
1411
1412 module_init(cxgb3i_init_module);
1413 module_exit(cxgb3i_exit_module);