ac7a9b1e3e237ade16f38436fecffa2e6ded69bb
[linux-2.6.git] / drivers / scsi / cxgbi / cxgb4i / cxgb4i.c
1 /*
2  * cxgb4i.c: Chelsio 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  *              Rakesh Ranjan (rranjan@chelsio.com)
12  */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <scsi/scsi_host.h>
19 #include <net/tcp.h>
20 #include <net/dst.h>
21 #include <linux/netdevice.h>
22
23 #include "t4_msg.h"
24 #include "cxgb4.h"
25 #include "cxgb4_uld.h"
26 #include "t4fw_api.h"
27 #include "l2t.h"
28 #include "cxgb4i.h"
29
30 static unsigned int dbg_level;
31
32 #include "../libcxgbi.h"
33
34 #define DRV_MODULE_NAME         "cxgb4i"
35 #define DRV_MODULE_DESC         "Chelsio T4 iSCSI Driver"
36 #define DRV_MODULE_VERSION      "0.9.1"
37 #define DRV_MODULE_RELDATE      "Aug. 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 cxgb4i_rcv_win = 256 * 1024;
52 module_param(cxgb4i_rcv_win, int, 0644);
53 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
54
55 static int cxgb4i_snd_win = 128 * 1024;
56 module_param(cxgb4i_snd_win, int, 0644);
57 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
58
59 static int cxgb4i_rx_credit_thres = 10 * 1024;
60 module_param(cxgb4i_rx_credit_thres, int, 0644);
61 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
62                 "RX credits return threshold in bytes (default=10KB)");
63
64 static unsigned int cxgb4i_max_connect = (8 * 1024);
65 module_param(cxgb4i_max_connect, uint, 0644);
66 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
67
68 static unsigned short cxgb4i_sport_base = 20000;
69 module_param(cxgb4i_sport_base, ushort, 0644);
70 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
71
72 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
73
74 static void *t4_uld_add(const struct cxgb4_lld_info *);
75 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
76 static int t4_uld_state_change(void *, enum cxgb4_state state);
77
78 static const struct cxgb4_uld_info cxgb4i_uld_info = {
79         .name = DRV_MODULE_NAME,
80         .add = t4_uld_add,
81         .rx_handler = t4_uld_rx_handler,
82         .state_change = t4_uld_state_change,
83 };
84
85 static struct scsi_host_template cxgb4i_host_template = {
86         .module         = THIS_MODULE,
87         .name           = DRV_MODULE_NAME,
88         .proc_name      = DRV_MODULE_NAME,
89         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
90         .queuecommand   = iscsi_queuecommand,
91         .change_queue_depth = iscsi_change_queue_depth,
92         .sg_tablesize   = SG_ALL,
93         .max_sectors    = 0xFFFF,
94         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
95         .eh_abort_handler = iscsi_eh_abort,
96         .eh_device_reset_handler = iscsi_eh_device_reset,
97         .eh_target_reset_handler = iscsi_eh_recover_target,
98         .target_alloc   = iscsi_target_alloc,
99         .use_clustering = DISABLE_CLUSTERING,
100         .this_id        = -1,
101 };
102
103 static struct iscsi_transport cxgb4i_iscsi_transport = {
104         .owner          = THIS_MODULE,
105         .name           = DRV_MODULE_NAME,
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 *cxgb4i_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 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
154 #define RCV_BUFSIZ_MASK         0x3FFU
155 #define MAX_IMM_TX_PKT_LEN      128
156
157 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
158                                 const struct cxgbi_sock *csk)
159 {
160         skb->queue_mapping = queue;
161 }
162
163 static int push_tx_frames(struct cxgbi_sock *, int);
164
165 /*
166  * is_ofld_imm - check whether a packet can be sent as immediate data
167  * @skb: the packet
168  *
169  * Returns true if a packet can be sent as an offload WR with immediate
170  * data.  We currently use the same limit as for Ethernet packets.
171  */
172 static inline int is_ofld_imm(const struct sk_buff *skb)
173 {
174         return skb->len <= (MAX_IMM_TX_PKT_LEN -
175                         sizeof(struct fw_ofld_tx_data_wr));
176 }
177
178 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
179                                 struct l2t_entry *e)
180 {
181         struct cpl_act_open_req *req;
182         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
183         unsigned long long opt0;
184         unsigned int opt2;
185         unsigned int qid_atid = ((unsigned int)csk->atid) |
186                                  (((unsigned int)csk->rss_qid) << 14);
187
188         opt0 = KEEP_ALIVE(1) |
189                 WND_SCALE(wscale) |
190                 MSS_IDX(csk->mss_idx) |
191                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
192                 TX_CHAN(csk->tx_chan) |
193                 SMAC_SEL(csk->smac_idx) |
194                 ULP_MODE(ULP_MODE_ISCSI) |
195                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
196         opt2 = RX_CHANNEL(0) |
197                 RSS_QUEUE_VALID |
198                 (1 << 20) | (1 << 22) |
199                 RSS_QUEUE(csk->rss_qid);
200
201         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
202         req = (struct cpl_act_open_req *)skb->head;
203
204         INIT_TP_WR(req, 0);
205         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
206                                         qid_atid));
207         req->local_port = csk->saddr.sin_port;
208         req->peer_port = csk->daddr.sin_port;
209         req->local_ip = csk->saddr.sin_addr.s_addr;
210         req->peer_ip = csk->daddr.sin_addr.s_addr;
211         req->opt0 = cpu_to_be64(opt0);
212         req->params = 0;
213         req->opt2 = cpu_to_be32(opt2);
214
215         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
216                 "csk 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
217                 csk, &req->local_ip, ntohs(req->local_port),
218                 &req->peer_ip, ntohs(req->peer_port),
219                 csk->atid, csk->rss_qid);
220
221         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
222 }
223
224 static void send_close_req(struct cxgbi_sock *csk)
225 {
226         struct sk_buff *skb = csk->cpl_close;
227         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
228         unsigned int tid = csk->tid;
229
230         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
231                 "csk 0x%p,%u,0x%lx, tid %u.\n",
232                 csk, csk->state, csk->flags, csk->tid);
233         csk->cpl_close = NULL;
234         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
235         INIT_TP_WR(req, tid);
236         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
237         req->rsvd = 0;
238
239         cxgbi_sock_skb_entail(csk, skb);
240         if (csk->state >= CTP_ESTABLISHED)
241                 push_tx_frames(csk, 1);
242 }
243
244 static void abort_arp_failure(void *handle, struct sk_buff *skb)
245 {
246         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
247         struct cpl_abort_req *req;
248
249         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
250                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
251                 csk, csk->state, csk->flags, csk->tid);
252         req = (struct cpl_abort_req *)skb->data;
253         req->cmd = CPL_ABORT_NO_RST;
254         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
255 }
256
257 static void send_abort_req(struct cxgbi_sock *csk)
258 {
259         struct cpl_abort_req *req;
260         struct sk_buff *skb = csk->cpl_abort_req;
261
262         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
263                 return;
264         cxgbi_sock_set_state(csk, CTP_ABORTING);
265         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
266         cxgbi_sock_purge_write_queue(csk);
267
268         csk->cpl_abort_req = NULL;
269         req = (struct cpl_abort_req *)skb->head;
270         set_queue(skb, CPL_PRIORITY_DATA, csk);
271         req->cmd = CPL_ABORT_SEND_RST;
272         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
273         INIT_TP_WR(req, csk->tid);
274         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
275         req->rsvd0 = htonl(csk->snd_nxt);
276         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
277
278         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
279                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
280                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
281                 req->rsvd1);
282
283         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
284 }
285
286 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
287 {
288         struct sk_buff *skb = csk->cpl_abort_rpl;
289         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
290
291         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
292                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
293                 csk, csk->state, csk->flags, csk->tid, rst_status);
294
295         csk->cpl_abort_rpl = NULL;
296         set_queue(skb, CPL_PRIORITY_DATA, csk);
297         INIT_TP_WR(rpl, csk->tid);
298         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
299         rpl->cmd = rst_status;
300         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
301 }
302
303 /*
304  * CPL connection rx data ack: host ->
305  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
306  * credits sent.
307  */
308 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
309 {
310         struct sk_buff *skb;
311         struct cpl_rx_data_ack *req;
312
313         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
314                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
315                 csk, csk->state, csk->flags, csk->tid, credits);
316
317         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
318         if (!skb) {
319                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
320                 return 0;
321         }
322         req = (struct cpl_rx_data_ack *)skb->head;
323
324         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
325         INIT_TP_WR(req, csk->tid);
326         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
327                                       csk->tid));
328         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
329         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
330         return credits;
331 }
332
333 /*
334  * sgl_len - calculates the size of an SGL of the given capacity
335  * @n: the number of SGL entries
336  * Calculates the number of flits needed for a scatter/gather list that
337  * can hold the given number of entries.
338  */
339 static inline unsigned int sgl_len(unsigned int n)
340 {
341         n--;
342         return (3 * n) / 2 + (n & 1) + 2;
343 }
344
345 /*
346  * calc_tx_flits_ofld - calculate # of flits for an offload packet
347  * @skb: the packet
348  *
349  * Returns the number of flits needed for the given offload packet.
350  * These packets are already fully constructed and no additional headers
351  * will be added.
352  */
353 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
354 {
355         unsigned int flits, cnt;
356
357         if (is_ofld_imm(skb))
358                 return DIV_ROUND_UP(skb->len, 8);
359         flits = skb_transport_offset(skb) / 8;
360         cnt = skb_shinfo(skb)->nr_frags;
361         if (skb->tail != skb->transport_header)
362                 cnt++;
363         return flits + sgl_len(cnt);
364 }
365
366 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
367 {
368         struct sk_buff *skb;
369         struct fw_flowc_wr *flowc;
370         int flowclen, i;
371
372         flowclen = 80;
373         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
374         flowc = (struct fw_flowc_wr *)skb->head;
375         flowc->op_to_nparams =
376                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
377         flowc->flowid_len16 =
378                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
379                                 FW_WR_FLOWID(csk->tid));
380         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
381         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
382         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
383         flowc->mnemval[1].val = htonl(csk->tx_chan);
384         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
385         flowc->mnemval[2].val = htonl(csk->tx_chan);
386         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
387         flowc->mnemval[3].val = htonl(csk->rss_qid);
388         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
389         flowc->mnemval[4].val = htonl(csk->snd_nxt);
390         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
391         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
392         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
393         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
394         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
395         flowc->mnemval[7].val = htonl(csk->advmss);
396         flowc->mnemval[8].mnemonic = 0;
397         flowc->mnemval[8].val = 0;
398         for (i = 0; i < 9; i++) {
399                 flowc->mnemval[i].r4[0] = 0;
400                 flowc->mnemval[i].r4[1] = 0;
401                 flowc->mnemval[i].r4[2] = 0;
402         }
403         set_queue(skb, CPL_PRIORITY_DATA, csk);
404
405         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
406                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
407                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
408                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
409                 csk->advmss);
410
411         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
412 }
413
414 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
415                                    int dlen, int len, u32 credits, int compl)
416 {
417         struct fw_ofld_tx_data_wr *req;
418         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
419         unsigned int wr_ulp_mode = 0;
420
421         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
422
423         if (is_ofld_imm(skb)) {
424                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
425                                         FW_WR_COMPL(1) |
426                                         FW_WR_IMMDLEN(dlen));
427                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
428                                                 FW_WR_LEN16(credits));
429         } else {
430                 req->op_to_immdlen =
431                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
432                                         FW_WR_COMPL(1) |
433                                         FW_WR_IMMDLEN(0));
434                 req->flowid_len16 =
435                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
436                                         FW_WR_LEN16(credits));
437         }
438         if (submode)
439                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
440                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
441         req->tunnel_to_proxy = htonl(wr_ulp_mode) |
442                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1);
443         req->plen = htonl(len);
444         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
445                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
446 }
447
448 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
449 {
450         kfree_skb(skb);
451 }
452
453 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
454 {
455         int total_size = 0;
456         struct sk_buff *skb;
457
458         if (unlikely(csk->state < CTP_ESTABLISHED ||
459                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
460                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
461                          1 << CXGBI_DBG_PDU_TX,
462                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
463                         csk, csk->state, csk->flags, csk->tid);
464                 return 0;
465         }
466
467         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
468                 int dlen = skb->len;
469                 int len = skb->len;
470                 unsigned int credits_needed;
471
472                 skb_reset_transport_header(skb);
473                 if (is_ofld_imm(skb))
474                         credits_needed = DIV_ROUND_UP(dlen +
475                                         sizeof(struct fw_ofld_tx_data_wr), 16);
476                 else
477                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
478                                         + sizeof(struct fw_ofld_tx_data_wr),
479                                         16);
480
481                 if (csk->wr_cred < credits_needed) {
482                         log_debug(1 << CXGBI_DBG_PDU_TX,
483                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
484                                 csk, skb->len, skb->data_len,
485                                 credits_needed, csk->wr_cred);
486                         break;
487                 }
488                 __skb_unlink(skb, &csk->write_queue);
489                 set_queue(skb, CPL_PRIORITY_DATA, csk);
490                 skb->csum = credits_needed;
491                 csk->wr_cred -= credits_needed;
492                 csk->wr_una_cred += credits_needed;
493                 cxgbi_sock_enqueue_wr(csk, skb);
494
495                 log_debug(1 << CXGBI_DBG_PDU_TX,
496                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
497                         csk, skb->len, skb->data_len, credits_needed,
498                         csk->wr_cred, csk->wr_una_cred);
499
500                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
501                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
502                                 send_tx_flowc_wr(csk);
503                                 skb->csum += 5;
504                                 csk->wr_cred -= 5;
505                                 csk->wr_una_cred += 5;
506                         }
507                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
508                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
509                                         req_completion);
510                         csk->snd_nxt += len;
511                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
512                 }
513                 total_size += skb->truesize;
514                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
515
516                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
517                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
518                         csk, csk->state, csk->flags, csk->tid, skb, len);
519
520                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
521         }
522         return total_size;
523 }
524
525 static inline void free_atid(struct cxgbi_sock *csk)
526 {
527         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
528
529         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
530                 cxgb4_free_atid(lldi->tids, csk->atid);
531                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
532                 cxgbi_sock_put(csk);
533         }
534 }
535
536 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
537 {
538         struct cxgbi_sock *csk;
539         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
540         unsigned short tcp_opt = ntohs(req->tcp_opt);
541         unsigned int tid = GET_TID(req);
542         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
543         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
544         struct tid_info *t = lldi->tids;
545         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
546
547         csk = lookup_atid(t, atid);
548         if (unlikely(!csk)) {
549                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
550                 goto rel_skb;
551         }
552
553         if (csk->atid != atid) {
554                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
555                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
556                 goto rel_skb;
557         }
558
559         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
560                 "csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
561                 csk, csk->state, csk->flags, tid, atid, rcv_isn);
562
563         cxgbi_sock_get(csk);
564         csk->tid = tid;
565         cxgb4_insert_tid(lldi->tids, csk, tid);
566         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
567
568         free_atid(csk);
569
570         spin_lock_bh(&csk->lock);
571         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
572                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
573                         csk, csk->state, csk->flags, csk->tid);
574
575         if (csk->retry_timer.function) {
576                 del_timer(&csk->retry_timer);
577                 csk->retry_timer.function = NULL;
578         }
579
580         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
581         /*
582          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
583          * pass through opt0.
584          */
585         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
586                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
587
588         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
589         if (GET_TCPOPT_TSTAMP(tcp_opt))
590                 csk->advmss -= 12;
591         if (csk->advmss < 128)
592                 csk->advmss = 128;
593
594         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
595                 "csk 0x%p, mss_idx %u, advmss %u.\n",
596                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
597
598         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
599
600         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
601                 send_abort_req(csk);
602         else {
603                 if (skb_queue_len(&csk->write_queue))
604                         push_tx_frames(csk, 0);
605                 cxgbi_conn_tx_open(csk);
606         }
607         spin_unlock_bh(&csk->lock);
608
609 rel_skb:
610         __kfree_skb(skb);
611 }
612
613 static int act_open_rpl_status_to_errno(int status)
614 {
615         switch (status) {
616         case CPL_ERR_CONN_RESET:
617                 return -ECONNREFUSED;
618         case CPL_ERR_ARP_MISS:
619                 return -EHOSTUNREACH;
620         case CPL_ERR_CONN_TIMEDOUT:
621                 return -ETIMEDOUT;
622         case CPL_ERR_TCAM_FULL:
623                 return -ENOMEM;
624         case CPL_ERR_CONN_EXIST:
625                 return -EADDRINUSE;
626         default:
627                 return -EIO;
628         }
629 }
630
631 static void csk_act_open_retry_timer(unsigned long data)
632 {
633         struct sk_buff *skb;
634         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
635
636         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
637                 "csk 0x%p,%u,0x%lx,%u.\n",
638                 csk, csk->state, csk->flags, csk->tid);
639
640         cxgbi_sock_get(csk);
641         spin_lock_bh(&csk->lock);
642         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
643         if (!skb)
644                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
645         else {
646                 skb->sk = (struct sock *)csk;
647                 t4_set_arp_err_handler(skb, csk,
648                                         cxgbi_sock_act_open_req_arp_failure);
649                 send_act_open_req(csk, skb, csk->l2t);
650         }
651         spin_unlock_bh(&csk->lock);
652         cxgbi_sock_put(csk);
653 }
654
655 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
656 {
657         struct cxgbi_sock *csk;
658         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
659         unsigned int tid = GET_TID(rpl);
660         unsigned int atid =
661                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
662         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
663         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
664         struct tid_info *t = lldi->tids;
665
666         csk = lookup_atid(t, atid);
667         if (unlikely(!csk)) {
668                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
669                 goto rel_skb;
670         }
671
672         pr_info("%pI4:%u-%pI4:%u, atid %u,%u, status %u, csk 0x%p,%u,0x%lx.\n",
673                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
674                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port),
675                 atid, tid, status, csk, csk->state, csk->flags);
676
677         if (status == CPL_ERR_RTX_NEG_ADVICE)
678                 goto rel_skb;
679
680         if (status && status != CPL_ERR_TCAM_FULL &&
681             status != CPL_ERR_CONN_EXIST &&
682             status != CPL_ERR_ARP_MISS)
683                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
684
685         cxgbi_sock_get(csk);
686         spin_lock_bh(&csk->lock);
687
688         if (status == CPL_ERR_CONN_EXIST &&
689             csk->retry_timer.function != csk_act_open_retry_timer) {
690                 csk->retry_timer.function = csk_act_open_retry_timer;
691                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
692         } else
693                 cxgbi_sock_fail_act_open(csk,
694                                         act_open_rpl_status_to_errno(status));
695
696         spin_unlock_bh(&csk->lock);
697         cxgbi_sock_put(csk);
698 rel_skb:
699         __kfree_skb(skb);
700 }
701
702 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
703 {
704         struct cxgbi_sock *csk;
705         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
706         unsigned int tid = GET_TID(req);
707         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
708         struct tid_info *t = lldi->tids;
709
710         csk = lookup_tid(t, tid);
711         if (unlikely(!csk)) {
712                 pr_err("can't find connection for tid %u.\n", tid);
713                 goto rel_skb;
714         }
715         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
716                 "csk 0x%p,%u,0x%lx,%u.\n",
717                 csk, csk->state, csk->flags, csk->tid);
718         cxgbi_sock_rcv_peer_close(csk);
719 rel_skb:
720         __kfree_skb(skb);
721 }
722
723 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
724 {
725         struct cxgbi_sock *csk;
726         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
727         unsigned int tid = GET_TID(rpl);
728         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
729         struct tid_info *t = lldi->tids;
730
731         csk = lookup_tid(t, tid);
732         if (unlikely(!csk)) {
733                 pr_err("can't find connection for tid %u.\n", tid);
734                 goto rel_skb;
735         }
736         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
737                 "csk 0x%p,%u,0x%lx,%u.\n",
738                 csk, csk->state, csk->flags, csk->tid);
739         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
740 rel_skb:
741         __kfree_skb(skb);
742 }
743
744 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
745                                                                 int *need_rst)
746 {
747         switch (abort_reason) {
748         case CPL_ERR_BAD_SYN: /* fall through */
749         case CPL_ERR_CONN_RESET:
750                 return csk->state > CTP_ESTABLISHED ?
751                         -EPIPE : -ECONNRESET;
752         case CPL_ERR_XMIT_TIMEDOUT:
753         case CPL_ERR_PERSIST_TIMEDOUT:
754         case CPL_ERR_FINWAIT2_TIMEDOUT:
755         case CPL_ERR_KEEPALIVE_TIMEDOUT:
756                 return -ETIMEDOUT;
757         default:
758                 return -EIO;
759         }
760 }
761
762 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
763 {
764         struct cxgbi_sock *csk;
765         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
766         unsigned int tid = GET_TID(req);
767         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
768         struct tid_info *t = lldi->tids;
769         int rst_status = CPL_ABORT_NO_RST;
770
771         csk = lookup_tid(t, tid);
772         if (unlikely(!csk)) {
773                 pr_err("can't find connection for tid %u.\n", tid);
774                 goto rel_skb;
775         }
776
777         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
778                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
779                 csk, csk->state, csk->flags, csk->tid, req->status);
780
781         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
782             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
783                 goto rel_skb;
784
785         cxgbi_sock_get(csk);
786         spin_lock_bh(&csk->lock);
787
788         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
789                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
790                 cxgbi_sock_set_state(csk, CTP_ABORTING);
791                 goto done;
792         }
793
794         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
795         send_abort_rpl(csk, rst_status);
796
797         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
798                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
799                 cxgbi_sock_closed(csk);
800         }
801 done:
802         spin_unlock_bh(&csk->lock);
803         cxgbi_sock_put(csk);
804 rel_skb:
805         __kfree_skb(skb);
806 }
807
808 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
809 {
810         struct cxgbi_sock *csk;
811         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
812         unsigned int tid = GET_TID(rpl);
813         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
814         struct tid_info *t = lldi->tids;
815
816         csk = lookup_tid(t, tid);
817         if (!csk)
818                 goto rel_skb;
819
820         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
821                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
822                 rpl->status, csk, csk ? csk->state : 0,
823                 csk ? csk->flags : 0UL);
824
825         if (rpl->status == CPL_ERR_ABORT_FAILED)
826                 goto rel_skb;
827
828         cxgbi_sock_rcv_abort_rpl(csk);
829 rel_skb:
830         __kfree_skb(skb);
831 }
832
833 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
834 {
835         struct cxgbi_sock *csk;
836         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
837         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
838         unsigned int tid = GET_TID(cpl);
839         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
840         struct tid_info *t = lldi->tids;
841
842         csk = lookup_tid(t, tid);
843         if (unlikely(!csk)) {
844                 pr_err("can't find conn. for tid %u.\n", tid);
845                 goto rel_skb;
846         }
847
848         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
849                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
850                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
851                 pdu_len_ddp);
852
853         spin_lock_bh(&csk->lock);
854
855         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
856                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
857                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
858                         csk, csk->state, csk->flags, csk->tid);
859                 if (csk->state != CTP_ABORTING)
860                         goto abort_conn;
861                 else
862                         goto discard;
863         }
864
865         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
866         cxgbi_skcb_flags(skb) = 0;
867
868         skb_reset_transport_header(skb);
869         __skb_pull(skb, sizeof(*cpl));
870         __pskb_trim(skb, ntohs(cpl->len));
871
872         if (!csk->skb_ulp_lhdr) {
873                 unsigned char *bhs;
874                 unsigned int hlen, dlen;
875
876                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
877                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
878                         csk, csk->state, csk->flags, csk->tid, skb);
879                 csk->skb_ulp_lhdr = skb;
880                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
881
882                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
883                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
884                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
885                                 csk->rcv_nxt);
886                         goto abort_conn;
887                 }
888
889                 bhs = skb->data;
890                 hlen = ntohs(cpl->len);
891                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
892
893                 if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
894                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
895                                 "mismatch %u != %u + %u, seq 0x%x.\n",
896                                 csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
897                                 hlen, dlen, cxgbi_skcb_tcp_seq(skb));
898                         goto abort_conn;
899                 }
900
901                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
902                 if (dlen)
903                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
904                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
905
906                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
907                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
908                         csk, skb, *bhs, hlen, dlen,
909                         ntohl(*((unsigned int *)(bhs + 16))),
910                         ntohl(*((unsigned int *)(bhs + 24))));
911
912         } else {
913                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
914
915                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
916                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
917                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
918                         csk, csk->state, csk->flags, skb, lskb);
919         }
920
921         __skb_queue_tail(&csk->receive_queue, skb);
922         spin_unlock_bh(&csk->lock);
923         return;
924
925 abort_conn:
926         send_abort_req(csk);
927 discard:
928         spin_unlock_bh(&csk->lock);
929 rel_skb:
930         __kfree_skb(skb);
931 }
932
933 static void do_rx_data_ddp(struct cxgbi_device *cdev,
934                                   struct sk_buff *skb)
935 {
936         struct cxgbi_sock *csk;
937         struct sk_buff *lskb;
938         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
939         unsigned int tid = GET_TID(rpl);
940         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
941         struct tid_info *t = lldi->tids;
942         unsigned int status = ntohl(rpl->ddpvld);
943
944         csk = lookup_tid(t, tid);
945         if (unlikely(!csk)) {
946                 pr_err("can't find connection for tid %u.\n", tid);
947                 goto rel_skb;
948         }
949
950         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
951                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
952                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
953
954         spin_lock_bh(&csk->lock);
955
956         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
957                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
958                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
959                         csk, csk->state, csk->flags, csk->tid);
960                 if (csk->state != CTP_ABORTING)
961                         goto abort_conn;
962                 else
963                         goto discard;
964         }
965
966         if (!csk->skb_ulp_lhdr) {
967                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
968                 goto abort_conn;
969         }
970
971         lskb = csk->skb_ulp_lhdr;
972         csk->skb_ulp_lhdr = NULL;
973
974         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
975
976         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
977                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
978                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
979
980         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
981                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
982                         csk, lskb, status, cxgbi_skcb_flags(lskb));
983                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
984         }
985         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
986                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
987                         csk, lskb, status, cxgbi_skcb_flags(lskb));
988                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
989         }
990         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
991                 log_debug(1 << CXGBI_DBG_PDU_RX,
992                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
993                         csk, lskb, status);
994                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
995         }
996         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
997                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
998                 log_debug(1 << CXGBI_DBG_PDU_RX,
999                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1000                         csk, lskb, status);
1001                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1002         }
1003         log_debug(1 << CXGBI_DBG_PDU_RX,
1004                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1005                 csk, lskb, cxgbi_skcb_flags(lskb));
1006
1007         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1008         cxgbi_conn_pdu_ready(csk);
1009         spin_unlock_bh(&csk->lock);
1010         goto rel_skb;
1011
1012 abort_conn:
1013         send_abort_req(csk);
1014 discard:
1015         spin_unlock_bh(&csk->lock);
1016 rel_skb:
1017         __kfree_skb(skb);
1018 }
1019
1020 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1021 {
1022         struct cxgbi_sock *csk;
1023         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1024         unsigned int tid = GET_TID(rpl);
1025         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1026         struct tid_info *t = lldi->tids;
1027
1028         csk = lookup_tid(t, tid);
1029         if (unlikely(!csk))
1030                 pr_err("can't find connection for tid %u.\n", tid);
1031         else {
1032                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1033                         "csk 0x%p,%u,0x%lx,%u.\n",
1034                         csk, csk->state, csk->flags, csk->tid);
1035                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1036                                         rpl->seq_vld);
1037         }
1038         __kfree_skb(skb);
1039 }
1040
1041 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1042 {
1043         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1044         unsigned int tid = GET_TID(rpl);
1045         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1046         struct tid_info *t = lldi->tids;
1047         struct cxgbi_sock *csk;
1048
1049         csk = lookup_tid(t, tid);
1050         if (!csk)
1051                 pr_err("can't find conn. for tid %u.\n", tid);
1052
1053         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1054                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1055                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1056
1057         if (rpl->status != CPL_ERR_NONE)
1058                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1059                         csk, tid, rpl->status);
1060
1061         __kfree_skb(skb);
1062 }
1063
1064 static int alloc_cpls(struct cxgbi_sock *csk)
1065 {
1066         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1067                                         0, GFP_KERNEL);
1068         if (!csk->cpl_close)
1069                 return -ENOMEM;
1070
1071         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1072                                         0, GFP_KERNEL);
1073         if (!csk->cpl_abort_req)
1074                 goto free_cpls;
1075
1076         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1077                                         0, GFP_KERNEL);
1078         if (!csk->cpl_abort_rpl)
1079                 goto free_cpls;
1080         return 0;
1081
1082 free_cpls:
1083         cxgbi_sock_free_cpl_skbs(csk);
1084         return -ENOMEM;
1085 }
1086
1087 static inline void l2t_put(struct cxgbi_sock *csk)
1088 {
1089         if (csk->l2t) {
1090                 cxgb4_l2t_release(csk->l2t);
1091                 csk->l2t = NULL;
1092                 cxgbi_sock_put(csk);
1093         }
1094 }
1095
1096 static void release_offload_resources(struct cxgbi_sock *csk)
1097 {
1098         struct cxgb4_lld_info *lldi;
1099
1100         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1101                 "csk 0x%p,%u,0x%lx,%u.\n",
1102                 csk, csk->state, csk->flags, csk->tid);
1103
1104         cxgbi_sock_free_cpl_skbs(csk);
1105         if (csk->wr_cred != csk->wr_max_cred) {
1106                 cxgbi_sock_purge_wr_queue(csk);
1107                 cxgbi_sock_reset_wr_list(csk);
1108         }
1109
1110         l2t_put(csk);
1111         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1112                 free_atid(csk);
1113         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1114                 lldi = cxgbi_cdev_priv(csk->cdev);
1115                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1116                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1117                 cxgbi_sock_put(csk);
1118         }
1119         csk->dst = NULL;
1120         csk->cdev = NULL;
1121 }
1122
1123 static int init_act_open(struct cxgbi_sock *csk)
1124 {
1125         struct cxgbi_device *cdev = csk->cdev;
1126         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1127         struct net_device *ndev = cdev->ports[csk->port_id];
1128         struct port_info *pi = netdev_priv(ndev);
1129         struct sk_buff *skb = NULL;
1130         unsigned int step;
1131
1132         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1133                 "csk 0x%p,%u,0x%lx,%u.\n",
1134                 csk, csk->state, csk->flags, csk->tid);
1135
1136         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1137         if (csk->atid < 0) {
1138                 pr_err("%s, NO atid available.\n", ndev->name);
1139                 return -EINVAL;
1140         }
1141         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1142         cxgbi_sock_get(csk);
1143
1144         csk->l2t = cxgb4_l2t_get(lldi->l2t, dst_get_neighbour(csk->dst), ndev, 0);
1145         if (!csk->l2t) {
1146                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1147                 goto rel_resource;
1148         }
1149         cxgbi_sock_get(csk);
1150
1151         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1152         if (!skb)
1153                 goto rel_resource;
1154         skb->sk = (struct sock *)csk;
1155         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1156
1157         if (!csk->mtu)
1158                 csk->mtu = dst_mtu(csk->dst);
1159         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1160         csk->tx_chan = cxgb4_port_chan(ndev);
1161         /* SMT two entries per row */
1162         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1163         step = lldi->ntxq / lldi->nchan;
1164         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1165         step = lldi->nrxq / lldi->nchan;
1166         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1167         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1168         csk->wr_una_cred = 0;
1169         cxgbi_sock_reset_wr_list(csk);
1170         csk->err = 0;
1171         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1172                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1173                 csk, pi->port_id, ndev->name, csk->tx_chan,
1174                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1175                 csk->smac_idx);
1176
1177         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1178         send_act_open_req(csk, skb, csk->l2t);
1179         return 0;
1180
1181 rel_resource:
1182         if (skb)
1183                 __kfree_skb(skb);
1184         return -EINVAL;
1185 }
1186
1187 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1188         [CPL_ACT_ESTABLISH] = do_act_establish,
1189         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1190         [CPL_PEER_CLOSE] = do_peer_close,
1191         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1192         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1193         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1194         [CPL_FW4_ACK] = do_fw4_ack,
1195         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1196         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1197         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1198 };
1199
1200 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1201 {
1202         int rc;
1203
1204         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1205                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1206
1207         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1208                                         cxgb4i_max_connect);
1209         if (rc < 0)
1210                 return rc;
1211
1212         cdev->csk_release_offload_resources = release_offload_resources;
1213         cdev->csk_push_tx_frames = push_tx_frames;
1214         cdev->csk_send_abort_req = send_abort_req;
1215         cdev->csk_send_close_req = send_close_req;
1216         cdev->csk_send_rx_credits = send_rx_credits;
1217         cdev->csk_alloc_cpls = alloc_cpls;
1218         cdev->csk_init_act_open = init_act_open;
1219
1220         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1221         return 0;
1222 }
1223
1224 /*
1225  * functions to program the pagepod in h/w
1226  */
1227 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1228 static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1229                                 unsigned int wr_len, unsigned int dlen,
1230                                 unsigned int pm_addr)
1231 {
1232         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1233
1234         INIT_ULPTX_WR(req, wr_len, 0, 0);
1235         req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) | (1 << 23));
1236         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1237         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1238         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1239
1240         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1241         idata->len = htonl(dlen);
1242 }
1243
1244 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1245                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1246                                 unsigned int npods,
1247                                 struct cxgbi_gather_list *gl,
1248                                 unsigned int gl_pidx)
1249 {
1250         struct cxgbi_ddp_info *ddp = cdev->ddp;
1251         struct sk_buff *skb;
1252         struct ulp_mem_io *req;
1253         struct ulptx_idata *idata;
1254         struct cxgbi_pagepod *ppod;
1255         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1256         unsigned int dlen = PPOD_SIZE * npods;
1257         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1258                                 sizeof(struct ulptx_idata) + dlen, 16);
1259         unsigned int i;
1260
1261         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1262         if (!skb) {
1263                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1264                         cdev, idx, npods);
1265                 return -ENOMEM;
1266         }
1267         req = (struct ulp_mem_io *)skb->head;
1268         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1269
1270         ulp_mem_io_set_hdr(req, wr_len, dlen, pm_addr);
1271         idata = (struct ulptx_idata *)(req + 1);
1272         ppod = (struct cxgbi_pagepod *)(idata + 1);
1273
1274         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1275                 if (!hdr && !gl)
1276                         cxgbi_ddp_ppod_clear(ppod);
1277                 else
1278                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1279         }
1280
1281         cxgb4_ofld_send(cdev->ports[port_id], skb);
1282         return 0;
1283 }
1284
1285 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1286                         unsigned int idx, unsigned int npods,
1287                         struct cxgbi_gather_list *gl)
1288 {
1289         unsigned int i, cnt;
1290         int err = 0;
1291
1292         for (i = 0; i < npods; i += cnt, idx += cnt) {
1293                 cnt = npods - i;
1294                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1295                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1296                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1297                                         idx, cnt, gl, 4 * i);
1298                 if (err < 0)
1299                         break;
1300         }
1301         return err;
1302 }
1303
1304 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1305                           unsigned int idx, unsigned int npods)
1306 {
1307         unsigned int i, cnt;
1308         int err;
1309
1310         for (i = 0; i < npods; i += cnt, idx += cnt) {
1311                 cnt = npods - i;
1312                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1313                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1314                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1315                                         idx, cnt, NULL, 0);
1316                 if (err < 0)
1317                         break;
1318         }
1319 }
1320
1321 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1322                                 int pg_idx, bool reply)
1323 {
1324         struct sk_buff *skb;
1325         struct cpl_set_tcb_field *req;
1326
1327         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1328                 return 0;
1329
1330         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1331         if (!skb)
1332                 return -ENOMEM;
1333
1334         /*  set up ulp page size */
1335         req = (struct cpl_set_tcb_field *)skb->head;
1336         INIT_TP_WR(req, csk->tid);
1337         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1338         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1339         req->word_cookie = htons(0);
1340         req->mask = cpu_to_be64(0x3 << 8);
1341         req->val = cpu_to_be64(pg_idx << 8);
1342         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1343
1344         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1345                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1346
1347         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1348         return 0;
1349 }
1350
1351 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1352                                  int hcrc, int dcrc, int reply)
1353 {
1354         struct sk_buff *skb;
1355         struct cpl_set_tcb_field *req;
1356
1357         if (!hcrc && !dcrc)
1358                 return 0;
1359
1360         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1361         if (!skb)
1362                 return -ENOMEM;
1363
1364         csk->hcrc_len = (hcrc ? 4 : 0);
1365         csk->dcrc_len = (dcrc ? 4 : 0);
1366         /*  set up ulp submode */
1367         req = (struct cpl_set_tcb_field *)skb->head;
1368         INIT_TP_WR(req, tid);
1369         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1370         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1371         req->word_cookie = htons(0);
1372         req->mask = cpu_to_be64(0x3 << 4);
1373         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1374                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1375         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1376
1377         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1378                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1379
1380         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1381         return 0;
1382 }
1383
1384 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1385 {
1386         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1387         struct cxgbi_ddp_info *ddp = cdev->ddp;
1388         unsigned int tagmask, pgsz_factor[4];
1389         int err;
1390
1391         if (ddp) {
1392                 kref_get(&ddp->refcnt);
1393                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1394                         cdev, cdev->ddp);
1395                 return -EALREADY;
1396         }
1397
1398         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1399                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1400                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1401         if (err < 0)
1402                 return err;
1403
1404         ddp = cdev->ddp;
1405
1406         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1407         cxgbi_ddp_page_size_factor(pgsz_factor);
1408         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1409
1410         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1411         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1412         cdev->csk_ddp_set = ddp_set_map;
1413         cdev->csk_ddp_clear = ddp_clear_map;
1414
1415         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1416                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1417                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1418         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1419                 " %u/%u.\n",
1420                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1421                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1422                 ddp->max_rxsz, lldi->iscsi_iolen);
1423         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1424                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1425                 ddp->max_rxsz);
1426         return 0;
1427 }
1428
1429 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1430 {
1431         struct cxgbi_device *cdev;
1432         struct port_info *pi;
1433         int i, rc;
1434
1435         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1436         if (!cdev) {
1437                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1438                 return NULL;
1439         }
1440         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1441                 cdev, lldi->adapter_type, lldi->nports,
1442                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1443                 lldi->nrxq, lldi->wr_cred);
1444         for (i = 0; i < lldi->nrxq; i++)
1445                 log_debug(1 << CXGBI_DBG_DEV,
1446                         "t4 0x%p, rxq id #%d: %u.\n",
1447                         cdev, i, lldi->rxq_ids[i]);
1448
1449         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1450         cdev->flags = CXGBI_FLAG_DEV_T4;
1451         cdev->pdev = lldi->pdev;
1452         cdev->ports = lldi->ports;
1453         cdev->nports = lldi->nports;
1454         cdev->mtus = lldi->mtus;
1455         cdev->nmtus = NMTUS;
1456         cdev->snd_win = cxgb4i_snd_win;
1457         cdev->rcv_win = cxgb4i_rcv_win;
1458         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1459         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1460         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1461         cdev->itp = &cxgb4i_iscsi_transport;
1462
1463         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1464         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1465                 cdev, lldi->ports[0]->name, cdev->pfvf);
1466
1467         rc = cxgb4i_ddp_init(cdev);
1468         if (rc) {
1469                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1470                 goto err_out;
1471         }
1472         rc = cxgb4i_ofld_init(cdev);
1473         if (rc) {
1474                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1475                 goto err_out;
1476         }
1477
1478         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1479                                 &cxgb4i_host_template, cxgb4i_stt);
1480         if (rc)
1481                 goto err_out;
1482
1483         for (i = 0; i < cdev->nports; i++) {
1484                 pi = netdev_priv(lldi->ports[i]);
1485                 cdev->hbas[i]->port_id = pi->port_id;
1486         }
1487         return cdev;
1488
1489 err_out:
1490         cxgbi_device_unregister(cdev);
1491         return ERR_PTR(-ENOMEM);
1492 }
1493
1494 #define RX_PULL_LEN     128
1495 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1496                                 const struct pkt_gl *pgl)
1497 {
1498         const struct cpl_act_establish *rpl;
1499         struct sk_buff *skb;
1500         unsigned int opc;
1501         struct cxgbi_device *cdev = handle;
1502
1503         if (pgl == NULL) {
1504                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1505
1506                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1507                 if (!skb)
1508                         goto nomem;
1509                 skb_copy_to_linear_data(skb, &rsp[1], len);
1510         } else {
1511                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1512                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1513                                 pgl->va, be64_to_cpu(*rsp),
1514                                 be64_to_cpu(*(u64 *)pgl->va),
1515                                 pgl->tot_len);
1516                         return 0;
1517                 }
1518                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1519                 if (unlikely(!skb))
1520                         goto nomem;
1521         }
1522
1523         rpl = (struct cpl_act_establish *)skb->data;
1524         opc = rpl->ot.opcode;
1525         log_debug(1 << CXGBI_DBG_TOE,
1526                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1527                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1528         if (cxgb4i_cplhandlers[opc])
1529                 cxgb4i_cplhandlers[opc](cdev, skb);
1530         else {
1531                 pr_err("No handler for opcode 0x%x.\n", opc);
1532                 __kfree_skb(skb);
1533         }
1534         return 0;
1535 nomem:
1536         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1537         return 1;
1538 }
1539
1540 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1541 {
1542         struct cxgbi_device *cdev = handle;
1543
1544         switch (state) {
1545         case CXGB4_STATE_UP:
1546                 pr_info("cdev 0x%p, UP.\n", cdev);
1547                 /* re-initialize */
1548                 break;
1549         case CXGB4_STATE_START_RECOVERY:
1550                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1551                 /* close all connections */
1552                 break;
1553         case CXGB4_STATE_DOWN:
1554                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1555                 break;
1556         case CXGB4_STATE_DETACH:
1557                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1558                 break;
1559         default:
1560                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1561                 break;
1562         }
1563         return 0;
1564 }
1565
1566 static int __init cxgb4i_init_module(void)
1567 {
1568         int rc;
1569
1570         printk(KERN_INFO "%s", version);
1571
1572         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1573         if (rc < 0)
1574                 return rc;
1575         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1576         return 0;
1577 }
1578
1579 static void __exit cxgb4i_exit_module(void)
1580 {
1581         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1582         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1583         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1584 }
1585
1586 module_init(cxgb4i_init_module);
1587 module_exit(cxgb4i_exit_module);