b375a683a6b05ba4ff68264a07f93037d6d9e436
[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/version.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <scsi/scsi_host.h>
20 #include <net/tcp.h>
21 #include <net/dst.h>
22 #include <linux/netdevice.h>
23
24 #include "t4_msg.h"
25 #include "cxgb4.h"
26 #include "cxgb4_uld.h"
27 #include "t4fw_api.h"
28 #include "l2t.h"
29 #include "cxgb4i.h"
30
31 static unsigned int dbg_level;
32
33 #include "../libcxgbi.h"
34
35 #define DRV_MODULE_NAME         "cxgb4i"
36 #define DRV_MODULE_DESC         "Chelsio T4 iSCSI Driver"
37 #define DRV_MODULE_VERSION      "0.9.0"
38 #define DRV_MODULE_RELDATE      "May 2010"
39
40 static char version[] =
41         DRV_MODULE_DESC " " DRV_MODULE_NAME
42         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
43
44 MODULE_AUTHOR("Chelsio Communications, Inc.");
45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
46 MODULE_VERSION(DRV_MODULE_VERSION);
47 MODULE_LICENSE("GPL");
48
49 module_param(dbg_level, uint, 0644);
50 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
51
52 static int cxgb4i_rcv_win = 256 * 1024;
53 module_param(cxgb4i_rcv_win, int, 0644);
54 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
55
56 static int cxgb4i_snd_win = 128 * 1024;
57 module_param(cxgb4i_snd_win, int, 0644);
58 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
59
60 static int cxgb4i_rx_credit_thres = 10 * 1024;
61 module_param(cxgb4i_rx_credit_thres, int, 0644);
62 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
63                 "RX credits return threshold in bytes (default=10KB)");
64
65 static unsigned int cxgb4i_max_connect = (8 * 1024);
66 module_param(cxgb4i_max_connect, uint, 0644);
67 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
68
69 static unsigned short cxgb4i_sport_base = 20000;
70 module_param(cxgb4i_sport_base, ushort, 0644);
71 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
72
73 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
74
75 static void *t4_uld_add(const struct cxgb4_lld_info *);
76 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
77 static int t4_uld_state_change(void *, enum cxgb4_state state);
78
79 static const struct cxgb4_uld_info cxgb4i_uld_info = {
80         .name = DRV_MODULE_NAME,
81         .add = t4_uld_add,
82         .rx_handler = t4_uld_rx_handler,
83         .state_change = t4_uld_state_change,
84 };
85
86 static struct scsi_host_template cxgb4i_host_template = {
87         .module         = THIS_MODULE,
88         .name           = DRV_MODULE_NAME,
89         .proc_name      = DRV_MODULE_NAME,
90         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
91         .queuecommand   = iscsi_queuecommand,
92         .change_queue_depth = iscsi_change_queue_depth,
93         .sg_tablesize   = SG_ALL,
94         .max_sectors    = 0xFFFF,
95         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
96         .eh_abort_handler = iscsi_eh_abort,
97         .eh_device_reset_handler = iscsi_eh_device_reset,
98         .eh_target_reset_handler = iscsi_eh_recover_target,
99         .target_alloc   = iscsi_target_alloc,
100         .use_clustering = DISABLE_CLUSTERING,
101         .this_id        = -1,
102 };
103
104 static struct iscsi_transport cxgb4i_iscsi_transport = {
105         .owner          = THIS_MODULE,
106         .name           = DRV_MODULE_NAME,
107         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
108                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
109                                 CAP_PADDING_OFFLOAD,
110         .param_mask     = ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
111                                 ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
112                                 ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
113                                 ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
114                                 ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
115                                 ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
116                                 ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
117                                 ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
118                                 ISCSI_PERSISTENT_ADDRESS |
119                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
120                                 ISCSI_USERNAME | ISCSI_PASSWORD |
121                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
122                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
123                                 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
124                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
125                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
126         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
127                                 ISCSI_HOST_INITIATOR_NAME |
128                                 ISCSI_HOST_NETDEV_NAME,
129         .get_host_param = cxgbi_get_host_param,
130         .set_host_param = cxgbi_set_host_param,
131         /* session management */
132         .create_session = cxgbi_create_session,
133         .destroy_session        = cxgbi_destroy_session,
134         .get_session_param = iscsi_session_get_param,
135         /* connection management */
136         .create_conn    = cxgbi_create_conn,
137         .bind_conn              = cxgbi_bind_conn,
138         .destroy_conn   = iscsi_tcp_conn_teardown,
139         .start_conn             = iscsi_conn_start,
140         .stop_conn              = iscsi_conn_stop,
141         .get_conn_param = cxgbi_get_conn_param,
142         .set_param      = cxgbi_set_conn_param,
143         .get_stats      = cxgbi_get_conn_stats,
144         /* pdu xmit req from user space */
145         .send_pdu       = iscsi_conn_send_pdu,
146         /* task */
147         .init_task      = iscsi_tcp_task_init,
148         .xmit_task      = iscsi_tcp_task_xmit,
149         .cleanup_task   = cxgbi_cleanup_task,
150         /* pdu */
151         .alloc_pdu      = cxgbi_conn_alloc_pdu,
152         .init_pdu       = cxgbi_conn_init_pdu,
153         .xmit_pdu       = cxgbi_conn_xmit_pdu,
154         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
155         /* TCP connect/disconnect */
156         .ep_connect     = cxgbi_ep_connect,
157         .ep_poll        = cxgbi_ep_poll,
158         .ep_disconnect  = cxgbi_ep_disconnect,
159         /* Error recovery timeout call */
160         .session_recovery_timedout = iscsi_session_recovery_timedout,
161 };
162
163 static struct scsi_transport_template *cxgb4i_stt;
164
165 /*
166  * CPL (Chelsio Protocol Language) defines a message passing interface between
167  * the host driver and Chelsio asic.
168  * The section below implments CPLs that related to iscsi tcp connection
169  * open/close/abort and data send/receive.
170  */
171 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
172 #define RCV_BUFSIZ_MASK         0x3FFU
173 #define MAX_IMM_TX_PKT_LEN      128
174
175 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
176                                 const struct cxgbi_sock *csk)
177 {
178         skb->queue_mapping = queue;
179 }
180
181 static int push_tx_frames(struct cxgbi_sock *, int);
182
183 /*
184  * is_ofld_imm - check whether a packet can be sent as immediate data
185  * @skb: the packet
186  *
187  * Returns true if a packet can be sent as an offload WR with immediate
188  * data.  We currently use the same limit as for Ethernet packets.
189  */
190 static inline int is_ofld_imm(const struct sk_buff *skb)
191 {
192         return skb->len <= (MAX_IMM_TX_PKT_LEN -
193                         sizeof(struct fw_ofld_tx_data_wr));
194 }
195
196 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
197                                 struct l2t_entry *e)
198 {
199         struct cpl_act_open_req *req;
200         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
201         unsigned long long opt0;
202         unsigned int opt2;
203         unsigned int qid_atid = ((unsigned int)csk->atid) |
204                                  (((unsigned int)csk->rss_qid) << 14);
205
206         opt0 = KEEP_ALIVE(1) |
207                 WND_SCALE(wscale) |
208                 MSS_IDX(csk->mss_idx) |
209                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
210                 TX_CHAN(csk->tx_chan) |
211                 SMAC_SEL(csk->smac_idx) |
212                 ULP_MODE(ULP_MODE_ISCSI) |
213                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
214         opt2 = RX_CHANNEL(0) |
215                 RSS_QUEUE_VALID |
216                 (1 << 20) | (1 << 22) |
217                 RSS_QUEUE(csk->rss_qid);
218
219         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
220         req = (struct cpl_act_open_req *)skb->head;
221
222         INIT_TP_WR(req, 0);
223         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
224                                         qid_atid));
225         req->local_port = csk->saddr.sin_port;
226         req->peer_port = csk->daddr.sin_port;
227         req->local_ip = csk->saddr.sin_addr.s_addr;
228         req->peer_ip = csk->daddr.sin_addr.s_addr;
229         req->opt0 = cpu_to_be64(opt0);
230         req->params = 0;
231         req->opt2 = cpu_to_be32(opt2);
232
233         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
234                 "csk 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
235                 csk, &req->local_ip, ntohs(req->local_port),
236                 &req->peer_ip, ntohs(req->peer_port),
237                 csk->atid, csk->rss_qid);
238
239         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
240 }
241
242 static void send_close_req(struct cxgbi_sock *csk)
243 {
244         struct sk_buff *skb = csk->cpl_close;
245         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
246         unsigned int tid = csk->tid;
247
248         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
249                 "csk 0x%p,%u,0x%lx, tid %u.\n",
250                 csk, csk->state, csk->flags, csk->tid);
251         csk->cpl_close = NULL;
252         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
253         INIT_TP_WR(req, tid);
254         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
255         req->rsvd = 0;
256
257         cxgbi_sock_skb_entail(csk, skb);
258         if (csk->state >= CTP_ESTABLISHED)
259                 push_tx_frames(csk, 1);
260 }
261
262 static void abort_arp_failure(void *handle, struct sk_buff *skb)
263 {
264         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
265         struct cpl_abort_req *req;
266
267         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
268                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
269                 csk, csk->state, csk->flags, csk->tid);
270         req = (struct cpl_abort_req *)skb->data;
271         req->cmd = CPL_ABORT_NO_RST;
272         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
273 }
274
275 static void send_abort_req(struct cxgbi_sock *csk)
276 {
277         struct cpl_abort_req *req;
278         struct sk_buff *skb = csk->cpl_abort_req;
279
280         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
281                 return;
282         cxgbi_sock_set_state(csk, CTP_ABORTING);
283         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
284         cxgbi_sock_purge_write_queue(csk);
285
286         csk->cpl_abort_req = NULL;
287         req = (struct cpl_abort_req *)skb->head;
288         set_queue(skb, CPL_PRIORITY_DATA, csk);
289         req->cmd = CPL_ABORT_SEND_RST;
290         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
291         INIT_TP_WR(req, csk->tid);
292         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
293         req->rsvd0 = htonl(csk->snd_nxt);
294         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
295
296         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
297                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
298                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
299                 req->rsvd1);
300
301         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
302 }
303
304 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
305 {
306         struct sk_buff *skb = csk->cpl_abort_rpl;
307         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
308
309         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
310                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
311                 csk, csk->state, csk->flags, csk->tid, rst_status);
312
313         csk->cpl_abort_rpl = NULL;
314         set_queue(skb, CPL_PRIORITY_DATA, csk);
315         INIT_TP_WR(rpl, csk->tid);
316         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
317         rpl->cmd = rst_status;
318         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
319 }
320
321 /*
322  * CPL connection rx data ack: host ->
323  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
324  * credits sent.
325  */
326 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
327 {
328         struct sk_buff *skb;
329         struct cpl_rx_data_ack *req;
330
331         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
332                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
333                 csk, csk->state, csk->flags, csk->tid, credits);
334
335         skb = alloc_cpl(sizeof(*req), 0, GFP_ATOMIC);
336         if (!skb) {
337                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
338                 return 0;
339         }
340         req = (struct cpl_rx_data_ack *)skb->head;
341
342         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
343         INIT_TP_WR(req, csk->tid);
344         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
345                                       csk->tid));
346         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
347         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
348         return credits;
349 }
350
351 /*
352  * sgl_len - calculates the size of an SGL of the given capacity
353  * @n: the number of SGL entries
354  * Calculates the number of flits needed for a scatter/gather list that
355  * can hold the given number of entries.
356  */
357 static inline unsigned int sgl_len(unsigned int n)
358 {
359         n--;
360         return (3 * n) / 2 + (n & 1) + 2;
361 }
362
363 /*
364  * calc_tx_flits_ofld - calculate # of flits for an offload packet
365  * @skb: the packet
366  *
367  * Returns the number of flits needed for the given offload packet.
368  * These packets are already fully constructed and no additional headers
369  * will be added.
370  */
371 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
372 {
373         unsigned int flits, cnt;
374
375         if (is_ofld_imm(skb))
376                 return DIV_ROUND_UP(skb->len, 8);
377         flits = skb_transport_offset(skb) / 8;
378         cnt = skb_shinfo(skb)->nr_frags;
379         if (skb->tail != skb->transport_header)
380                 cnt++;
381         return flits + sgl_len(cnt);
382 }
383
384 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
385 {
386         struct sk_buff *skb;
387         struct fw_flowc_wr *flowc;
388         int flowclen, i;
389
390         flowclen = 80;
391         skb = alloc_cpl(flowclen, 0, GFP_ATOMIC);
392         flowc = (struct fw_flowc_wr *)skb->head;
393         flowc->op_to_nparams =
394                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
395         flowc->flowid_len16 =
396                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
397                                 FW_WR_FLOWID(csk->tid));
398         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
399         flowc->mnemval[0].val = htonl(0);
400         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
401         flowc->mnemval[1].val = htonl(csk->tx_chan);
402         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
403         flowc->mnemval[2].val = htonl(csk->tx_chan);
404         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
405         flowc->mnemval[3].val = htonl(csk->rss_qid);
406         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
407         flowc->mnemval[4].val = htonl(csk->snd_nxt);
408         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
409         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
410         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
411         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
412         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
413         flowc->mnemval[7].val = htonl(csk->advmss);
414         flowc->mnemval[8].mnemonic = 0;
415         flowc->mnemval[8].val = 0;
416         for (i = 0; i < 9; i++) {
417                 flowc->mnemval[i].r4[0] = 0;
418                 flowc->mnemval[i].r4[1] = 0;
419                 flowc->mnemval[i].r4[2] = 0;
420         }
421         set_queue(skb, CPL_PRIORITY_DATA, csk);
422
423         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
424                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
425                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
426                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
427                 csk->advmss);
428
429         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
430 }
431
432 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
433                                    int dlen, int len, u32 credits, int compl)
434 {
435         struct fw_ofld_tx_data_wr *req;
436         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
437         unsigned int wr_ulp_mode = 0;
438
439         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
440
441         if (is_ofld_imm(skb)) {
442                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
443                                         FW_WR_COMPL(1) |
444                                         FW_WR_IMMDLEN(dlen));
445                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
446                                                 FW_WR_LEN16(credits));
447         } else {
448                 req->op_to_immdlen =
449                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
450                                         FW_WR_COMPL(1) |
451                                         FW_WR_IMMDLEN(0));
452                 req->flowid_len16 =
453                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
454                                         FW_WR_LEN16(credits));
455         }
456         if (submode)
457                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
458                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
459         req->tunnel_to_proxy = htonl(wr_ulp_mode) |
460                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1);
461         req->plen = htonl(len);
462         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
463                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
464 }
465
466 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
467 {
468         kfree_skb(skb);
469 }
470
471 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
472 {
473         int total_size = 0;
474         struct sk_buff *skb;
475
476         if (unlikely(csk->state < CTP_ESTABLISHED ||
477                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
478                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
479                          1 << CXGBI_DBG_PDU_TX,
480                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
481                         csk, csk->state, csk->flags, csk->tid);
482                 return 0;
483         }
484
485         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
486                 int dlen = skb->len;
487                 int len = skb->len;
488                 unsigned int credits_needed;
489
490                 skb_reset_transport_header(skb);
491                 if (is_ofld_imm(skb))
492                         credits_needed = DIV_ROUND_UP(dlen +
493                                         sizeof(struct fw_ofld_tx_data_wr), 16);
494                 else
495                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
496                                         + sizeof(struct fw_ofld_tx_data_wr),
497                                         16);
498
499                 if (csk->wr_cred < credits_needed) {
500                         log_debug(1 << CXGBI_DBG_PDU_TX,
501                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
502                                 csk, skb->len, skb->data_len,
503                                 credits_needed, csk->wr_cred);
504                         break;
505                 }
506                 __skb_unlink(skb, &csk->write_queue);
507                 set_queue(skb, CPL_PRIORITY_DATA, csk);
508                 skb->csum = credits_needed;
509                 csk->wr_cred -= credits_needed;
510                 csk->wr_una_cred += credits_needed;
511                 cxgbi_sock_enqueue_wr(csk, skb);
512
513                 log_debug(1 << CXGBI_DBG_PDU_TX,
514                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
515                         csk, skb->len, skb->data_len, credits_needed,
516                         csk->wr_cred, csk->wr_una_cred);
517
518                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
519                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
520                                 send_tx_flowc_wr(csk);
521                                 skb->csum += 5;
522                                 csk->wr_cred -= 5;
523                                 csk->wr_una_cred += 5;
524                         }
525                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
526                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
527                                         req_completion);
528                         csk->snd_nxt += len;
529                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
530                 }
531                 total_size += skb->truesize;
532                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
533
534                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
535                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
536                         csk, csk->state, csk->flags, csk->tid, skb, len);
537
538                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
539         }
540         return total_size;
541 }
542
543 static inline void free_atid(struct cxgbi_sock *csk)
544 {
545         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
546
547         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
548                 cxgb4_free_atid(lldi->tids, csk->atid);
549                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
550                 cxgbi_sock_put(csk);
551         }
552 }
553
554 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
555 {
556         struct cxgbi_sock *csk;
557         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
558         unsigned short tcp_opt = ntohs(req->tcp_opt);
559         unsigned int tid = GET_TID(req);
560         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
561         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
562         struct tid_info *t = lldi->tids;
563         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
564
565         csk = lookup_atid(t, atid);
566         if (unlikely(!csk)) {
567                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
568                 goto rel_skb;
569         }
570
571         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
572                 "csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
573                 csk, csk->state, csk->flags, tid, atid, rcv_isn);
574
575         cxgbi_sock_get(csk);
576         csk->tid = tid;
577         cxgb4_insert_tid(lldi->tids, csk, tid);
578         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
579
580         free_atid(csk);
581
582         spin_lock_bh(&csk->lock);
583         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
584                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
585                         csk, csk->state, csk->flags, csk->tid);
586
587         if (csk->retry_timer.function) {
588                 del_timer(&csk->retry_timer);
589                 csk->retry_timer.function = NULL;
590         }
591
592         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
593         /*
594          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
595          * pass through opt0.
596          */
597         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
598                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
599
600         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
601         if (GET_TCPOPT_TSTAMP(tcp_opt))
602                 csk->advmss -= 12;
603         if (csk->advmss < 128)
604                 csk->advmss = 128;
605
606         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
607                 "csk 0x%p, mss_idx %u, advmss %u.\n",
608                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
609
610         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
611
612         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
613                 send_abort_req(csk);
614         else {
615                 if (skb_queue_len(&csk->write_queue))
616                         push_tx_frames(csk, 0);
617                 cxgbi_conn_tx_open(csk);
618         }
619         spin_unlock_bh(&csk->lock);
620
621 rel_skb:
622         __kfree_skb(skb);
623 }
624
625 static int act_open_rpl_status_to_errno(int status)
626 {
627         switch (status) {
628         case CPL_ERR_CONN_RESET:
629                 return -ECONNREFUSED;
630         case CPL_ERR_ARP_MISS:
631                 return -EHOSTUNREACH;
632         case CPL_ERR_CONN_TIMEDOUT:
633                 return -ETIMEDOUT;
634         case CPL_ERR_TCAM_FULL:
635                 return -ENOMEM;
636         case CPL_ERR_CONN_EXIST:
637                 return -EADDRINUSE;
638         default:
639                 return -EIO;
640         }
641 }
642
643 static void csk_act_open_retry_timer(unsigned long data)
644 {
645         struct sk_buff *skb;
646         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
647
648         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
649                 "csk 0x%p,%u,0x%lx,%u.\n",
650                 csk, csk->state, csk->flags, csk->tid);
651
652         cxgbi_sock_get(csk);
653         spin_lock_bh(&csk->lock);
654         skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
655         if (!skb)
656                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
657         else {
658                 skb->sk = (struct sock *)csk;
659                 t4_set_arp_err_handler(skb, csk,
660                                         cxgbi_sock_act_open_req_arp_failure);
661                 send_act_open_req(csk, skb, csk->l2t);
662         }
663         spin_unlock_bh(&csk->lock);
664         cxgbi_sock_put(csk);
665 }
666
667 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
668 {
669         struct cxgbi_sock *csk;
670         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
671         unsigned int tid = GET_TID(rpl);
672         unsigned int atid =
673                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
674         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
675         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
676         struct tid_info *t = lldi->tids;
677
678         csk = lookup_atid(t, atid);
679         if (unlikely(!csk)) {
680                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
681                 goto rel_skb;
682         }
683
684         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
685                 "csk 0x%p,%u,0x%lx, status %u, atid %u, tid %u.\n",
686                         csk, csk->state, csk->flags, status, atid, tid);
687
688         if (status && status != CPL_ERR_TCAM_FULL &&
689             status != CPL_ERR_CONN_EXIST &&
690             status != CPL_ERR_ARP_MISS)
691                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
692
693         cxgbi_sock_get(csk);
694         spin_lock_bh(&csk->lock);
695
696         if (status == CPL_ERR_CONN_EXIST &&
697             csk->retry_timer.function != csk_act_open_retry_timer) {
698                 csk->retry_timer.function = csk_act_open_retry_timer;
699                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
700         } else
701                 cxgbi_sock_fail_act_open(csk,
702                                         act_open_rpl_status_to_errno(status));
703
704         spin_unlock_bh(&csk->lock);
705         cxgbi_sock_put(csk);
706 rel_skb:
707         __kfree_skb(skb);
708 }
709
710 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
711 {
712         struct cxgbi_sock *csk;
713         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
714         unsigned int tid = GET_TID(req);
715         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
716         struct tid_info *t = lldi->tids;
717
718         csk = lookup_tid(t, tid);
719         if (unlikely(!csk)) {
720                 pr_err("can't find connection for tid %u.\n", tid);
721                 goto rel_skb;
722         }
723         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
724                 "csk 0x%p,%u,0x%lx,%u.\n",
725                 csk, csk->state, csk->flags, csk->tid);
726         cxgbi_sock_rcv_peer_close(csk);
727 rel_skb:
728         __kfree_skb(skb);
729 }
730
731 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
732 {
733         struct cxgbi_sock *csk;
734         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
735         unsigned int tid = GET_TID(rpl);
736         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
737         struct tid_info *t = lldi->tids;
738
739         csk = lookup_tid(t, tid);
740         if (unlikely(!csk)) {
741                 pr_err("can't find connection for tid %u.\n", tid);
742                 goto rel_skb;
743         }
744         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
745                 "csk 0x%p,%u,0x%lx,%u.\n",
746                 csk, csk->state, csk->flags, csk->tid);
747         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
748 rel_skb:
749         __kfree_skb(skb);
750 }
751
752 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
753                                                                 int *need_rst)
754 {
755         switch (abort_reason) {
756         case CPL_ERR_BAD_SYN: /* fall through */
757         case CPL_ERR_CONN_RESET:
758                 return csk->state > CTP_ESTABLISHED ?
759                         -EPIPE : -ECONNRESET;
760         case CPL_ERR_XMIT_TIMEDOUT:
761         case CPL_ERR_PERSIST_TIMEDOUT:
762         case CPL_ERR_FINWAIT2_TIMEDOUT:
763         case CPL_ERR_KEEPALIVE_TIMEDOUT:
764                 return -ETIMEDOUT;
765         default:
766                 return -EIO;
767         }
768 }
769
770 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
771 {
772         struct cxgbi_sock *csk;
773         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
774         unsigned int tid = GET_TID(req);
775         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
776         struct tid_info *t = lldi->tids;
777         int rst_status = CPL_ABORT_NO_RST;
778
779         csk = lookup_tid(t, tid);
780         if (unlikely(!csk)) {
781                 pr_err("can't find connection for tid %u.\n", tid);
782                 goto rel_skb;
783         }
784
785         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
786                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
787                 csk, csk->state, csk->flags, csk->tid, req->status);
788
789         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
790             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
791                 goto rel_skb;
792
793         cxgbi_sock_get(csk);
794         spin_lock_bh(&csk->lock);
795
796         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
797                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
798                 cxgbi_sock_set_state(csk, CTP_ABORTING);
799                 goto done;
800         }
801
802         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
803         send_abort_rpl(csk, rst_status);
804
805         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
806                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
807                 cxgbi_sock_closed(csk);
808         }
809 done:
810         spin_unlock_bh(&csk->lock);
811         cxgbi_sock_put(csk);
812 rel_skb:
813         __kfree_skb(skb);
814 }
815
816 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
817 {
818         struct cxgbi_sock *csk;
819         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
820         unsigned int tid = GET_TID(rpl);
821         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
822         struct tid_info *t = lldi->tids;
823
824         csk = lookup_tid(t, tid);
825         if (!csk)
826                 goto rel_skb;
827
828         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
829                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
830                 rpl->status, csk, csk ? csk->state : 0,
831                 csk ? csk->flags : 0UL);
832
833         if (rpl->status == CPL_ERR_ABORT_FAILED)
834                 goto rel_skb;
835
836         cxgbi_sock_rcv_abort_rpl(csk);
837 rel_skb:
838         __kfree_skb(skb);
839 }
840
841 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
842 {
843         struct cxgbi_sock *csk;
844         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
845         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
846         unsigned int tid = GET_TID(cpl);
847         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
848         struct tid_info *t = lldi->tids;
849         struct sk_buff *lskb;
850
851         csk = lookup_tid(t, tid);
852         if (unlikely(!csk)) {
853                 pr_err("can't find conn. for tid %u.\n", tid);
854                 goto rel_skb;
855         }
856
857         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
858                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
859                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
860                 pdu_len_ddp);
861
862         spin_lock_bh(&csk->lock);
863
864         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
865                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
866                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
867                         csk, csk->state, csk->flags, csk->tid);
868                 if (csk->state != CTP_ABORTING)
869                         goto abort_conn;
870                 else
871                         goto discard;
872         }
873
874         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
875         skb_reset_transport_header(skb);
876         __skb_pull(skb, sizeof(*cpl));
877         __pskb_trim(skb, ntohs(cpl->len));
878
879         if (!csk->skb_ulp_lhdr) {
880                 unsigned char *bhs;
881                 unsigned int hlen, dlen;
882
883                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
884                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
885                         csk, csk->state, csk->flags, csk->tid, skb);
886                 csk->skb_ulp_lhdr = skb;
887                 lskb = csk->skb_ulp_lhdr;
888                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HDR);
889
890                 if (cxgbi_skcb_tcp_seq(lskb) != csk->rcv_nxt) {
891                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
892                                 csk->tid, cxgbi_skcb_tcp_seq(lskb),
893                                 csk->rcv_nxt);
894                         goto abort_conn;
895                 }
896
897                 bhs = lskb->data;
898                 hlen = ntohs(cpl->len);
899                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
900
901                 if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
902                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
903                                 "mismatch %u != %u + %u, seq 0x%x.\n",
904                                 csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
905                                 hlen, dlen, cxgbi_skcb_tcp_seq(skb));
906                         goto abort_conn;
907                 }
908
909                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
910                 if (dlen)
911                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
912                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
913
914                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
915                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
916                         csk, skb, *bhs, hlen, dlen,
917                         ntohl(*((unsigned int *)(bhs + 16))),
918                         ntohl(*((unsigned int *)(bhs + 24))));
919
920         } else {
921                 lskb = csk->skb_ulp_lhdr;
922                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
923
924                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
925                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
926                         csk, csk->state, csk->flags, skb, lskb);
927         }
928
929         __skb_queue_tail(&csk->receive_queue, skb);
930         spin_unlock_bh(&csk->lock);
931         return;
932
933 abort_conn:
934         send_abort_req(csk);
935 discard:
936         spin_unlock_bh(&csk->lock);
937 rel_skb:
938         __kfree_skb(skb);
939 }
940
941 static void do_rx_data_ddp(struct cxgbi_device *cdev,
942                                   struct sk_buff *skb)
943 {
944         struct cxgbi_sock *csk;
945         struct sk_buff *lskb;
946         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
947         unsigned int tid = GET_TID(rpl);
948         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
949         struct tid_info *t = lldi->tids;
950         unsigned int status = ntohl(rpl->ddpvld);
951
952         csk = lookup_tid(t, tid);
953         if (unlikely(!csk)) {
954                 pr_err("can't find connection for tid %u.\n", tid);
955                 goto rel_skb;
956         }
957
958         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
959                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
960                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
961
962         spin_lock_bh(&csk->lock);
963
964         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
965                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
966                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
967                         csk, csk->state, csk->flags, csk->tid);
968                 if (csk->state != CTP_ABORTING)
969                         goto abort_conn;
970                 else
971                         goto discard;
972         }
973
974         if (!csk->skb_ulp_lhdr) {
975                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
976                 goto abort_conn;
977         }
978
979         lskb = csk->skb_ulp_lhdr;
980         csk->skb_ulp_lhdr = NULL;
981
982         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
983         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
984
985         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
986                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
987                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
988
989         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
990                 log_debug(1 << CXGBI_DBG_PDU_RX,
991                         "csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad.\n",
992                         csk, lskb, status);
993                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
994         }
995         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
996                 log_debug(1 << CXGBI_DBG_PDU_RX,
997                         "csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad.\n",
998                         csk, lskb, status);
999                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1000         }
1001         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1002                 log_debug(1 << CXGBI_DBG_PDU_RX,
1003                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1004                         csk, lskb, status);
1005                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1006         }
1007         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1008                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1009                 log_debug(1 << CXGBI_DBG_PDU_RX,
1010                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1011                         csk, lskb, status);
1012                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1013         }
1014         log_debug(1 << CXGBI_DBG_PDU_RX,
1015                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1016                 csk, lskb, cxgbi_skcb_flags(lskb));
1017
1018         cxgbi_conn_pdu_ready(csk);
1019         spin_unlock_bh(&csk->lock);
1020         goto rel_skb;
1021
1022 abort_conn:
1023         send_abort_req(csk);
1024 discard:
1025         spin_unlock_bh(&csk->lock);
1026 rel_skb:
1027         __kfree_skb(skb);
1028 }
1029
1030 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1031 {
1032         struct cxgbi_sock *csk;
1033         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1034         unsigned int tid = GET_TID(rpl);
1035         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1036         struct tid_info *t = lldi->tids;
1037
1038         csk = lookup_tid(t, tid);
1039         if (unlikely(!csk))
1040                 pr_err("can't find connection for tid %u.\n", tid);
1041         else {
1042                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1043                         "csk 0x%p,%u,0x%lx,%u.\n",
1044                         csk, csk->state, csk->flags, csk->tid);
1045                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1046                                         rpl->seq_vld);
1047         }
1048         __kfree_skb(skb);
1049 }
1050
1051 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1052 {
1053         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1054         unsigned int tid = GET_TID(rpl);
1055         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1056         struct tid_info *t = lldi->tids;
1057         struct cxgbi_sock *csk;
1058
1059         csk = lookup_tid(t, tid);
1060         if (!csk)
1061                 pr_err("can't find conn. for tid %u.\n", tid);
1062
1063         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1064                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1065                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1066
1067         if (rpl->status != CPL_ERR_NONE)
1068                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1069                         csk, tid, rpl->status);
1070
1071         __kfree_skb(skb);
1072 }
1073
1074 static int alloc_cpls(struct cxgbi_sock *csk)
1075 {
1076         csk->cpl_close = alloc_cpl(sizeof(struct cpl_close_con_req),
1077                                         0, GFP_NOIO);
1078         if (!csk->cpl_close)
1079                 return -ENOMEM;
1080
1081         csk->cpl_abort_req = alloc_cpl(sizeof(struct cpl_abort_req),
1082                                         0, GFP_NOIO);
1083         if (!csk->cpl_abort_req)
1084                 goto free_cpls;
1085
1086         csk->cpl_abort_rpl = alloc_cpl(sizeof(struct cpl_abort_rpl),
1087                                         0, GFP_NOIO);
1088         if (!csk->cpl_abort_rpl)
1089                 goto free_cpls;
1090         return 0;
1091
1092 free_cpls:
1093         cxgbi_sock_free_cpl_skbs(csk);
1094         return -ENOMEM;
1095 }
1096
1097 static inline void l2t_put(struct cxgbi_sock *csk)
1098 {
1099         if (csk->l2t) {
1100                 cxgb4_l2t_release(csk->l2t);
1101                 csk->l2t = NULL;
1102                 cxgbi_sock_put(csk);
1103         }
1104 }
1105
1106 static void release_offload_resources(struct cxgbi_sock *csk)
1107 {
1108         struct cxgb4_lld_info *lldi;
1109
1110         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1111                 "csk 0x%p,%u,0x%lx,%u.\n",
1112                 csk, csk->state, csk->flags, csk->tid);
1113
1114         cxgbi_sock_free_cpl_skbs(csk);
1115         if (csk->wr_cred != csk->wr_max_cred) {
1116                 cxgbi_sock_purge_wr_queue(csk);
1117                 cxgbi_sock_reset_wr_list(csk);
1118         }
1119
1120         l2t_put(csk);
1121         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1122                 free_atid(csk);
1123         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1124                 lldi = cxgbi_cdev_priv(csk->cdev);
1125                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1126                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1127                 cxgbi_sock_put(csk);
1128         }
1129         csk->dst = NULL;
1130         csk->cdev = NULL;
1131 }
1132
1133 static int init_act_open(struct cxgbi_sock *csk)
1134 {
1135         struct cxgbi_device *cdev = csk->cdev;
1136         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1137         struct net_device *ndev = cdev->ports[csk->port_id];
1138         struct port_info *pi = netdev_priv(ndev);
1139         struct sk_buff *skb = NULL;
1140         unsigned int step;
1141
1142         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1143                 "csk 0x%p,%u,0x%lx,%u.\n",
1144                 csk, csk->state, csk->flags, csk->tid);
1145
1146         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1147         if (csk->atid < 0) {
1148                 pr_err("%s, NO atid available.\n", ndev->name);
1149                 return -EINVAL;
1150         }
1151         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1152         cxgbi_sock_get(csk);
1153
1154         csk->l2t = cxgb4_l2t_get(lldi->l2t, csk->dst->neighbour, ndev, 0);
1155         if (!csk->l2t) {
1156                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1157                 goto rel_resource;
1158         }
1159         cxgbi_sock_get(csk);
1160
1161         skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_NOIO);
1162         if (!skb)
1163                 goto rel_resource;
1164         skb->sk = (struct sock *)csk;
1165         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1166
1167         if (!csk->mtu)
1168                 csk->mtu = dst_mtu(csk->dst);
1169         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1170         csk->tx_chan = cxgb4_port_chan(ndev);
1171         /* SMT two entries per row */
1172         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1173         step = lldi->ntxq / lldi->nchan;
1174         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1175         step = lldi->nrxq / lldi->nchan;
1176         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1177         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1178         csk->wr_una_cred = 0;
1179         cxgbi_sock_reset_wr_list(csk);
1180         csk->err = 0;
1181         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1182                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1183                 csk, pi->port_id, ndev->name, csk->tx_chan,
1184                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1185                 csk->smac_idx);
1186
1187         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1188         send_act_open_req(csk, skb, csk->l2t);
1189         return 0;
1190
1191 rel_resource:
1192         if (skb)
1193                 __kfree_skb(skb);
1194         return -EINVAL;
1195 }
1196
1197 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1198         [CPL_ACT_ESTABLISH] = do_act_establish,
1199         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1200         [CPL_PEER_CLOSE] = do_peer_close,
1201         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1202         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1203         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1204         [CPL_FW4_ACK] = do_fw4_ack,
1205         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1206         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1207         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1208 };
1209
1210 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1211 {
1212         int rc;
1213
1214         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1215                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1216
1217         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1218                                         cxgb4i_max_connect);
1219         if (rc < 0)
1220                 return rc;
1221
1222         cdev->csk_release_offload_resources = release_offload_resources;
1223         cdev->csk_push_tx_frames = push_tx_frames;
1224         cdev->csk_send_abort_req = send_abort_req;
1225         cdev->csk_send_close_req = send_close_req;
1226         cdev->csk_send_rx_credits = send_rx_credits;
1227         cdev->csk_alloc_cpls = alloc_cpls;
1228         cdev->csk_init_act_open = init_act_open;
1229
1230         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1231         return 0;
1232 }
1233
1234 /*
1235  * functions to program the pagepod in h/w
1236  */
1237 static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1238                                 unsigned int dlen, unsigned int pm_addr)
1239 {
1240         struct ulptx_sgl *sgl;
1241         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1242                                         sizeof(struct ulptx_sgl), 16);
1243
1244         INIT_ULPTX_WR(req, wr_len, 0, 0);
1245         req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE));
1246         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1247         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1248         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1249         sgl = (struct ulptx_sgl *)(req + 1);
1250         sgl->cmd_nsge = htonl(ULPTX_CMD(ULP_TX_SC_DSGL) | ULPTX_NSGE(1));
1251         sgl->len0 = htonl(dlen);
1252 }
1253
1254 static int ddp_ppod_write_sgl(struct cxgbi_device *cdev, unsigned int port_id,
1255                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1256                                 unsigned int npods,
1257                                 struct cxgbi_gather_list *gl,
1258                                 unsigned int gl_pidx)
1259 {
1260         struct cxgbi_ddp_info *ddp = cdev->ddp;
1261         unsigned int dlen, pm_addr;
1262         struct sk_buff *skb;
1263         struct ulp_mem_io *req;
1264         struct ulptx_sgl *sgl;
1265         struct cxgbi_pagepod *ppod;
1266         unsigned int i;
1267
1268         dlen = PPOD_SIZE * npods;
1269         pm_addr = idx * PPOD_SIZE + ddp->llimit;
1270
1271         skb = alloc_cpl(sizeof(*req) + sizeof(*sgl), dlen, GFP_ATOMIC);
1272         if (!skb) {
1273                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1274                         cdev, idx, npods);
1275                 return -ENOMEM;
1276         }
1277         req = (struct ulp_mem_io *)skb->head;
1278         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1279
1280         ulp_mem_io_set_hdr(req, dlen, pm_addr);
1281         sgl = (struct ulptx_sgl *)(req + 1);
1282         ppod = (struct cxgbi_pagepod *)(sgl + 1);
1283         sgl->addr0 = cpu_to_be64(virt_to_phys(ppod));
1284
1285         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1286                 if (!hdr && !gl)
1287                         cxgbi_ddp_ppod_clear(ppod);
1288                 else
1289                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1290         }
1291
1292         cxgb4_ofld_send(cdev->ports[port_id], skb);
1293         return 0;
1294 }
1295
1296 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1297                         unsigned int idx, unsigned int npods,
1298                         struct cxgbi_gather_list *gl)
1299 {
1300         unsigned int i, cnt;
1301         int err = 0;
1302
1303         for (i = 0; i < npods; i += cnt, idx += cnt) {
1304                 cnt = npods - i;
1305                 if (cnt > ULPMEM_DSGL_MAX_NPPODS)
1306                         cnt = ULPMEM_DSGL_MAX_NPPODS;
1307                 err = ddp_ppod_write_sgl(csk->cdev, csk->port_id, hdr,
1308                                         idx, cnt, gl, 4 * i);
1309                 if (err < 0)
1310                         break;
1311         }
1312         return err;
1313 }
1314
1315 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1316                           unsigned int idx, unsigned int npods)
1317 {
1318         unsigned int i, cnt;
1319         int err;
1320
1321         for (i = 0; i < npods; i += cnt, idx += cnt) {
1322                 cnt = npods - i;
1323                 if (cnt > ULPMEM_DSGL_MAX_NPPODS)
1324                         cnt = ULPMEM_DSGL_MAX_NPPODS;
1325                 err = ddp_ppod_write_sgl(chba->cdev, chba->port_id, NULL,
1326                                         idx, cnt, NULL, 0);
1327                 if (err < 0)
1328                         break;
1329         }
1330 }
1331
1332 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1333                                 int pg_idx, bool reply)
1334 {
1335         struct sk_buff *skb;
1336         struct cpl_set_tcb_field *req;
1337         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1338
1339         if (!pg_idx)
1340                 return 0;
1341
1342         skb = alloc_cpl(sizeof(*req), 0, GFP_KERNEL);
1343         if (!skb)
1344                 return -ENOMEM;
1345
1346         /*  set up ulp submode and page size */
1347         val = (val & 0x03) << 2;
1348         val |= TCB_ULP_TYPE(ULP2_MODE_ISCSI);
1349
1350         req = (struct cpl_set_tcb_field *)skb->head;
1351         INIT_TP_WR(req, csk->tid);
1352         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1353         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1354         req->word_cookie = htons(TCB_WORD(W_TCB_ULP_RAW));
1355         req->mask = cpu_to_be64(TCB_ULP_TYPE(TCB_ULP_TYPE_MASK));
1356         req->val = cpu_to_be64(val);
1357         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1358
1359         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1360                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1361
1362         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1363         return 0;
1364 }
1365
1366 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1367                                  int hcrc, int dcrc, int reply)
1368 {
1369         struct sk_buff *skb;
1370         struct cpl_set_tcb_field *req;
1371         u64 val = (hcrc ? ULP_CRC_HEADER : 0) | (dcrc ? ULP_CRC_DATA : 0);
1372
1373         val = TCB_ULP_RAW(val);
1374         val |= TCB_ULP_TYPE(ULP2_MODE_ISCSI);
1375
1376         skb = alloc_cpl(sizeof(*req), 0, GFP_KERNEL);
1377         if (!skb)
1378                 return -ENOMEM;
1379
1380         csk->hcrc_len = (hcrc ? 4 : 0);
1381         csk->dcrc_len = (dcrc ? 4 : 0);
1382         /*  set up ulp submode and page size */
1383         req = (struct cpl_set_tcb_field *)skb->head;
1384         INIT_TP_WR(req, tid);
1385         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1386         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1387         req->word_cookie = htons(TCB_WORD(W_TCB_ULP_RAW));
1388         req->mask = cpu_to_be64(TCB_ULP_RAW(TCB_ULP_RAW_MASK));
1389         req->val = cpu_to_be64(val);
1390         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1391
1392         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1393                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1394
1395         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1396         return 0;
1397 }
1398
1399 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1400 {
1401         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1402         struct cxgbi_ddp_info *ddp = cdev->ddp;
1403         unsigned int tagmask, pgsz_factor[4];
1404         int err;
1405
1406         if (ddp) {
1407                 kref_get(&ddp->refcnt);
1408                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1409                         cdev, cdev->ddp);
1410                 return -EALREADY;
1411         }
1412
1413         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1414                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1415                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1416         if (err < 0)
1417                 return err;
1418
1419         ddp = cdev->ddp;
1420
1421         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1422         cxgbi_ddp_page_size_factor(pgsz_factor);
1423         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1424
1425         cdev->csk_ddp_free_gl_skb = NULL;
1426         cdev->csk_ddp_alloc_gl_skb = NULL;
1427         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1428         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1429         cdev->csk_ddp_set = ddp_set_map;
1430         cdev->csk_ddp_clear = ddp_clear_map;
1431
1432         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1433                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1434                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1435         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1436                 " %u/%u.\n",
1437                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1438                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1439                 ddp->max_rxsz, lldi->iscsi_iolen);
1440         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1441                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1442                 ddp->max_rxsz);
1443         return 0;
1444 }
1445
1446 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1447 {
1448         struct cxgbi_device *cdev;
1449         struct port_info *pi;
1450         int i, rc;
1451
1452         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1453         if (!cdev) {
1454                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1455                 return NULL;
1456         }
1457         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1458                 cdev, lldi->adapter_type, lldi->nports,
1459                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1460                 lldi->nrxq, lldi->wr_cred);
1461         for (i = 0; i < lldi->nrxq; i++)
1462                 log_debug(1 << CXGBI_DBG_DEV,
1463                         "t4 0x%p, rxq id #%d: %u.\n",
1464                         cdev, i, lldi->rxq_ids[i]);
1465
1466         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1467         cdev->flags = CXGBI_FLAG_DEV_T4;
1468         cdev->pdev = lldi->pdev;
1469         cdev->ports = lldi->ports;
1470         cdev->nports = lldi->nports;
1471         cdev->mtus = lldi->mtus;
1472         cdev->nmtus = NMTUS;
1473         cdev->snd_win = cxgb4i_snd_win;
1474         cdev->rcv_win = cxgb4i_rcv_win;
1475         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1476         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1477         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1478         cdev->itp = &cxgb4i_iscsi_transport;
1479
1480         rc = cxgb4i_ddp_init(cdev);
1481         if (rc) {
1482                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1483                 goto err_out;
1484         }
1485         rc = cxgb4i_ofld_init(cdev);
1486         if (rc) {
1487                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1488                 goto err_out;
1489         }
1490
1491         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1492                                 &cxgb4i_host_template, cxgb4i_stt);
1493         if (rc)
1494                 goto err_out;
1495
1496         for (i = 0; i < cdev->nports; i++) {
1497                 pi = netdev_priv(lldi->ports[i]);
1498                 cdev->hbas[i]->port_id = pi->port_id;
1499         }
1500         return cdev;
1501
1502 err_out:
1503         cxgbi_device_unregister(cdev);
1504         return ERR_PTR(-ENOMEM);
1505 }
1506
1507 #define RX_PULL_LEN     128
1508 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1509                                 const struct pkt_gl *pgl)
1510 {
1511         const struct cpl_act_establish *rpl;
1512         struct sk_buff *skb;
1513         unsigned int opc;
1514         struct cxgbi_device *cdev = handle;
1515
1516         if (pgl == NULL) {
1517                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1518
1519                 skb = alloc_cpl(len, 0, GFP_ATOMIC);
1520                 if (!skb)
1521                         goto nomem;
1522                 skb_copy_to_linear_data(skb, &rsp[1], len);
1523         } else {
1524                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1525                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1526                                 pgl->va, be64_to_cpu(*rsp),
1527                                 be64_to_cpu(*(u64 *)pgl->va),
1528                                 pgl->tot_len);
1529                         return 0;
1530                 }
1531                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1532                 if (unlikely(!skb))
1533                         goto nomem;
1534         }
1535
1536         rpl = (struct cpl_act_establish *)skb->data;
1537         opc = rpl->ot.opcode;
1538         log_debug(1 << CXGBI_DBG_TOE,
1539                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1540                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1541         if (cxgb4i_cplhandlers[opc])
1542                 cxgb4i_cplhandlers[opc](cdev, skb);
1543         else {
1544                 pr_err("No handler for opcode 0x%x.\n", opc);
1545                 __kfree_skb(skb);
1546         }
1547         return 0;
1548 nomem:
1549         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1550         return 1;
1551 }
1552
1553 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1554 {
1555         struct cxgbi_device *cdev = handle;
1556
1557         switch (state) {
1558         case CXGB4_STATE_UP:
1559                 pr_info("cdev 0x%p, UP.\n", cdev);
1560                 /* re-initialize */
1561                 break;
1562         case CXGB4_STATE_START_RECOVERY:
1563                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1564                 /* close all connections */
1565                 break;
1566         case CXGB4_STATE_DOWN:
1567                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1568                 break;
1569         case CXGB4_STATE_DETACH:
1570                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1571                 break;
1572         default:
1573                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1574                 break;
1575         }
1576         return 0;
1577 }
1578
1579 static int __init cxgb4i_init_module(void)
1580 {
1581         int rc;
1582
1583         printk(KERN_INFO "%s", version);
1584
1585         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1586         if (rc < 0)
1587                 return rc;
1588         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1589         return 0;
1590 }
1591
1592 static void __exit cxgb4i_exit_module(void)
1593 {
1594         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1595         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1596         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1597 }
1598
1599 module_init(cxgb4i_init_module);
1600 module_exit(cxgb4i_exit_module);