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c3673464 KX |
1 | /* |
2 | * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management | |
3 | * | |
4 | * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
7 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
8 | * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this | |
9 | * release for licensing terms and conditions. | |
10 | * | |
11 | * Written by: Dimitris Michailidis (dm@chelsio.com) | |
12 | * Karen Xie (kxie@chelsio.com) | |
13 | */ | |
14 | ||
15 | #include <linux/if_vlan.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
c3673464 KX |
17 | #include <linux/version.h> |
18 | ||
19 | #include "cxgb3_defs.h" | |
20 | #include "cxgb3_ctl_defs.h" | |
21 | #include "firmware_exports.h" | |
22 | #include "cxgb3i_offload.h" | |
23 | #include "cxgb3i_pdu.h" | |
24 | #include "cxgb3i_ddp.h" | |
25 | ||
26 | #ifdef __DEBUG_C3CN_CONN__ | |
1648b11e | 27 | #define c3cn_conn_debug cxgb3i_log_debug |
c3673464 KX |
28 | #else |
29 | #define c3cn_conn_debug(fmt...) | |
30 | #endif | |
31 | ||
32 | #ifdef __DEBUG_C3CN_TX__ | |
1648b11e | 33 | #define c3cn_tx_debug cxgb3i_log_debug |
c3673464 KX |
34 | #else |
35 | #define c3cn_tx_debug(fmt...) | |
36 | #endif | |
37 | ||
38 | #ifdef __DEBUG_C3CN_RX__ | |
1648b11e | 39 | #define c3cn_rx_debug cxgb3i_log_debug |
c3673464 KX |
40 | #else |
41 | #define c3cn_rx_debug(fmt...) | |
42 | #endif | |
43 | ||
44 | /* | |
45 | * module parameters releated to offloaded iscsi connection | |
46 | */ | |
47 | static int cxgb3_rcv_win = 256 * 1024; | |
48 | module_param(cxgb3_rcv_win, int, 0644); | |
49 | MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)"); | |
50 | ||
1648b11e | 51 | static int cxgb3_snd_win = 128 * 1024; |
c3673464 | 52 | module_param(cxgb3_snd_win, int, 0644); |
1648b11e | 53 | MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)"); |
c3673464 KX |
54 | |
55 | static int cxgb3_rx_credit_thres = 10 * 1024; | |
56 | module_param(cxgb3_rx_credit_thres, int, 0644); | |
57 | MODULE_PARM_DESC(rx_credit_thres, | |
58 | "RX credits return threshold in bytes (default=10KB)"); | |
59 | ||
60 | static unsigned int cxgb3_max_connect = 8 * 1024; | |
61 | module_param(cxgb3_max_connect, uint, 0644); | |
62 | MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)"); | |
63 | ||
64 | static unsigned int cxgb3_sport_base = 20000; | |
65 | module_param(cxgb3_sport_base, uint, 0644); | |
66 | MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)"); | |
67 | ||
68 | /* | |
69 | * cxgb3i tcp connection data(per adapter) list | |
70 | */ | |
71 | static LIST_HEAD(cdata_list); | |
72 | static DEFINE_RWLOCK(cdata_rwlock); | |
73 | ||
74 | static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion); | |
75 | static void c3cn_release_offload_resources(struct s3_conn *c3cn); | |
76 | ||
77 | /* | |
78 | * iscsi source port management | |
79 | * | |
80 | * Find a free source port in the port allocation map. We use a very simple | |
81 | * rotor scheme to look for the next free port. | |
82 | * | |
83 | * If a source port has been specified make sure that it doesn't collide with | |
84 | * our normal source port allocation map. If it's outside the range of our | |
85 | * allocation/deallocation scheme just let them use it. | |
86 | * | |
87 | * If the source port is outside our allocation range, the caller is | |
88 | * responsible for keeping track of their port usage. | |
89 | */ | |
90 | static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata) | |
91 | { | |
92 | unsigned int start; | |
93 | int idx; | |
94 | ||
95 | if (!cdata) | |
96 | goto error_out; | |
97 | ||
2a90030f KX |
98 | if (c3cn->saddr.sin_port) { |
99 | cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n", | |
100 | c3cn->saddr.sin_port); | |
101 | return -EADDRINUSE; | |
c3673464 KX |
102 | } |
103 | ||
2a90030f KX |
104 | spin_lock_bh(&cdata->lock); |
105 | start = idx = cdata->sport_next; | |
c3673464 KX |
106 | do { |
107 | if (++idx >= cxgb3_max_connect) | |
108 | idx = 0; | |
2a90030f | 109 | if (!cdata->sport_conn[idx]) { |
c3673464 | 110 | c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx); |
2a90030f KX |
111 | cdata->sport_next = idx; |
112 | cdata->sport_conn[idx] = c3cn; | |
113 | spin_unlock_bh(&cdata->lock); | |
114 | ||
c3673464 KX |
115 | c3cn_conn_debug("%s reserve port %u.\n", |
116 | cdata->cdev->name, | |
117 | cxgb3_sport_base + idx); | |
118 | return 0; | |
119 | } | |
120 | } while (idx != start); | |
2a90030f | 121 | spin_unlock_bh(&cdata->lock); |
c3673464 KX |
122 | |
123 | error_out: | |
124 | return -EADDRNOTAVAIL; | |
125 | } | |
126 | ||
127 | static void c3cn_put_port(struct s3_conn *c3cn) | |
128 | { | |
2a90030f KX |
129 | if (!c3cn->cdev) |
130 | return; | |
c3673464 KX |
131 | |
132 | if (c3cn->saddr.sin_port) { | |
2a90030f | 133 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev); |
c3673464 KX |
134 | int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base; |
135 | ||
136 | c3cn->saddr.sin_port = 0; | |
137 | if (idx < 0 || idx >= cxgb3_max_connect) | |
138 | return; | |
2a90030f KX |
139 | spin_lock_bh(&cdata->lock); |
140 | cdata->sport_conn[idx] = NULL; | |
141 | spin_unlock_bh(&cdata->lock); | |
c3673464 KX |
142 | c3cn_conn_debug("%s, release port %u.\n", |
143 | cdata->cdev->name, cxgb3_sport_base + idx); | |
144 | } | |
145 | } | |
146 | ||
147 | static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag) | |
148 | { | |
149 | __set_bit(flag, &c3cn->flags); | |
150 | c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n", | |
151 | c3cn, flag, c3cn->state, c3cn->flags); | |
152 | } | |
153 | ||
154 | static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag) | |
155 | { | |
156 | __clear_bit(flag, &c3cn->flags); | |
157 | c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n", | |
158 | c3cn, flag, c3cn->state, c3cn->flags); | |
159 | } | |
160 | ||
161 | static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag) | |
162 | { | |
163 | if (c3cn == NULL) | |
164 | return 0; | |
165 | return test_bit(flag, &c3cn->flags); | |
166 | } | |
167 | ||
168 | static void c3cn_set_state(struct s3_conn *c3cn, int state) | |
169 | { | |
170 | c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state); | |
171 | c3cn->state = state; | |
172 | } | |
173 | ||
174 | static inline void c3cn_hold(struct s3_conn *c3cn) | |
175 | { | |
176 | atomic_inc(&c3cn->refcnt); | |
177 | } | |
178 | ||
179 | static inline void c3cn_put(struct s3_conn *c3cn) | |
180 | { | |
181 | if (atomic_dec_and_test(&c3cn->refcnt)) { | |
182 | c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n", | |
183 | c3cn, c3cn->state, c3cn->flags); | |
184 | kfree(c3cn); | |
185 | } | |
186 | } | |
187 | ||
188 | static void c3cn_closed(struct s3_conn *c3cn) | |
189 | { | |
190 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
191 | c3cn, c3cn->state, c3cn->flags); | |
192 | ||
193 | c3cn_put_port(c3cn); | |
194 | c3cn_release_offload_resources(c3cn); | |
195 | c3cn_set_state(c3cn, C3CN_STATE_CLOSED); | |
196 | cxgb3i_conn_closing(c3cn); | |
197 | } | |
198 | ||
199 | /* | |
200 | * CPL (Chelsio Protocol Language) defines a message passing interface between | |
201 | * the host driver and T3 asic. | |
202 | * The section below implments CPLs that related to iscsi tcp connection | |
203 | * open/close/abort and data send/receive. | |
204 | */ | |
205 | ||
206 | /* | |
207 | * CPL connection active open request: host -> | |
208 | */ | |
209 | static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu) | |
210 | { | |
211 | int i = 0; | |
212 | ||
213 | while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu) | |
214 | ++i; | |
215 | return i; | |
216 | } | |
217 | ||
218 | static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu) | |
219 | { | |
220 | unsigned int idx; | |
221 | struct dst_entry *dst = c3cn->dst_cache; | |
222 | struct t3cdev *cdev = c3cn->cdev; | |
223 | const struct t3c_data *td = T3C_DATA(cdev); | |
224 | u16 advmss = dst_metric(dst, RTAX_ADVMSS); | |
225 | ||
226 | if (advmss > pmtu - 40) | |
227 | advmss = pmtu - 40; | |
228 | if (advmss < td->mtus[0] - 40) | |
229 | advmss = td->mtus[0] - 40; | |
230 | idx = find_best_mtu(td, advmss + 40); | |
231 | return idx; | |
232 | } | |
233 | ||
234 | static inline int compute_wscale(int win) | |
235 | { | |
236 | int wscale = 0; | |
237 | while (wscale < 14 && (65535<<wscale) < win) | |
238 | wscale++; | |
239 | return wscale; | |
240 | } | |
241 | ||
242 | static inline unsigned int calc_opt0h(struct s3_conn *c3cn) | |
243 | { | |
244 | int wscale = compute_wscale(cxgb3_rcv_win); | |
245 | return V_KEEP_ALIVE(1) | | |
246 | F_TCAM_BYPASS | | |
247 | V_WND_SCALE(wscale) | | |
248 | V_MSS_IDX(c3cn->mss_idx); | |
249 | } | |
250 | ||
251 | static inline unsigned int calc_opt0l(struct s3_conn *c3cn) | |
252 | { | |
253 | return V_ULP_MODE(ULP_MODE_ISCSI) | | |
254 | V_RCV_BUFSIZ(cxgb3_rcv_win>>10); | |
255 | } | |
256 | ||
257 | static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb, | |
258 | unsigned int atid, const struct l2t_entry *e) | |
259 | { | |
260 | struct cpl_act_open_req *req; | |
261 | ||
262 | c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid); | |
263 | ||
264 | skb->priority = CPL_PRIORITY_SETUP; | |
265 | req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req)); | |
266 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); | |
267 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid)); | |
268 | req->local_port = c3cn->saddr.sin_port; | |
269 | req->peer_port = c3cn->daddr.sin_port; | |
270 | req->local_ip = c3cn->saddr.sin_addr.s_addr; | |
271 | req->peer_ip = c3cn->daddr.sin_addr.s_addr; | |
272 | req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) | | |
273 | V_TX_CHANNEL(e->smt_idx)); | |
274 | req->opt0l = htonl(calc_opt0l(c3cn)); | |
275 | req->params = 0; | |
276 | } | |
277 | ||
278 | static void fail_act_open(struct s3_conn *c3cn, int errno) | |
279 | { | |
280 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
281 | c3cn, c3cn->state, c3cn->flags); | |
282 | c3cn->err = errno; | |
283 | c3cn_closed(c3cn); | |
284 | } | |
285 | ||
286 | static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb) | |
287 | { | |
288 | struct s3_conn *c3cn = (struct s3_conn *)skb->sk; | |
289 | ||
290 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); | |
291 | ||
292 | c3cn_hold(c3cn); | |
293 | spin_lock_bh(&c3cn->lock); | |
294 | if (c3cn->state == C3CN_STATE_CONNECTING) | |
0109abff | 295 | fail_act_open(c3cn, -EHOSTUNREACH); |
c3673464 KX |
296 | spin_unlock_bh(&c3cn->lock); |
297 | c3cn_put(c3cn); | |
298 | __kfree_skb(skb); | |
299 | } | |
300 | ||
301 | /* | |
302 | * CPL connection close request: host -> | |
303 | * | |
304 | * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to | |
305 | * the write queue (i.e., after any unsent txt data). | |
306 | */ | |
307 | static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb, | |
308 | int flags) | |
309 | { | |
1648b11e KX |
310 | skb_tcp_seq(skb) = c3cn->write_seq; |
311 | skb_flags(skb) = flags; | |
c3673464 KX |
312 | __skb_queue_tail(&c3cn->write_queue, skb); |
313 | } | |
314 | ||
315 | static void send_close_req(struct s3_conn *c3cn) | |
316 | { | |
317 | struct sk_buff *skb = c3cn->cpl_close; | |
318 | struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head; | |
319 | unsigned int tid = c3cn->tid; | |
320 | ||
321 | c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n", | |
322 | c3cn, c3cn->state, c3cn->flags); | |
323 | ||
324 | c3cn->cpl_close = NULL; | |
325 | ||
326 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON)); | |
327 | req->wr.wr_lo = htonl(V_WR_TID(tid)); | |
328 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid)); | |
329 | req->rsvd = htonl(c3cn->write_seq); | |
330 | ||
331 | skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND); | |
332 | if (c3cn->state != C3CN_STATE_CONNECTING) | |
333 | c3cn_push_tx_frames(c3cn, 1); | |
334 | } | |
335 | ||
336 | /* | |
337 | * CPL connection abort request: host -> | |
338 | * | |
339 | * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs | |
340 | * for the same connection and also that we do not try to send a message | |
341 | * after the connection has closed. | |
342 | */ | |
343 | static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb) | |
344 | { | |
345 | struct cpl_abort_req *req = cplhdr(skb); | |
346 | ||
347 | c3cn_conn_debug("tdev 0x%p.\n", cdev); | |
348 | ||
349 | req->cmd = CPL_ABORT_NO_RST; | |
350 | cxgb3_ofld_send(cdev, skb); | |
351 | } | |
352 | ||
353 | static inline void c3cn_purge_write_queue(struct s3_conn *c3cn) | |
354 | { | |
355 | struct sk_buff *skb; | |
356 | ||
357 | while ((skb = __skb_dequeue(&c3cn->write_queue))) | |
358 | __kfree_skb(skb); | |
359 | } | |
360 | ||
361 | static void send_abort_req(struct s3_conn *c3cn) | |
362 | { | |
363 | struct sk_buff *skb = c3cn->cpl_abort_req; | |
364 | struct cpl_abort_req *req; | |
365 | unsigned int tid = c3cn->tid; | |
366 | ||
367 | if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb || | |
368 | !c3cn->cdev) | |
369 | return; | |
370 | ||
371 | c3cn_set_state(c3cn, C3CN_STATE_ABORTING); | |
372 | ||
373 | c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn); | |
374 | ||
375 | c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING); | |
376 | ||
377 | /* Purge the send queue so we don't send anything after an abort. */ | |
378 | c3cn_purge_write_queue(c3cn); | |
379 | ||
380 | c3cn->cpl_abort_req = NULL; | |
381 | req = (struct cpl_abort_req *)skb->head; | |
382 | ||
383 | skb->priority = CPL_PRIORITY_DATA; | |
384 | set_arp_failure_handler(skb, abort_arp_failure); | |
385 | ||
386 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ)); | |
387 | req->wr.wr_lo = htonl(V_WR_TID(tid)); | |
388 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid)); | |
389 | req->rsvd0 = htonl(c3cn->snd_nxt); | |
390 | req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT); | |
391 | req->cmd = CPL_ABORT_SEND_RST; | |
392 | ||
393 | l2t_send(c3cn->cdev, skb, c3cn->l2t); | |
394 | } | |
395 | ||
396 | /* | |
397 | * CPL connection abort reply: host -> | |
398 | * | |
399 | * Send an ABORT_RPL message in response of the ABORT_REQ received. | |
400 | */ | |
401 | static void send_abort_rpl(struct s3_conn *c3cn, int rst_status) | |
402 | { | |
403 | struct sk_buff *skb = c3cn->cpl_abort_rpl; | |
404 | struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head; | |
405 | ||
406 | c3cn->cpl_abort_rpl = NULL; | |
407 | ||
408 | skb->priority = CPL_PRIORITY_DATA; | |
409 | rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL)); | |
410 | rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid)); | |
411 | OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid)); | |
412 | rpl->cmd = rst_status; | |
413 | ||
414 | cxgb3_ofld_send(c3cn->cdev, skb); | |
415 | } | |
416 | ||
417 | /* | |
418 | * CPL connection rx data ack: host -> | |
419 | * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of | |
420 | * credits sent. | |
421 | */ | |
422 | static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack) | |
423 | { | |
424 | struct sk_buff *skb; | |
425 | struct cpl_rx_data_ack *req; | |
426 | ||
427 | skb = alloc_skb(sizeof(*req), GFP_ATOMIC); | |
428 | if (!skb) | |
429 | return 0; | |
430 | ||
431 | req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req)); | |
432 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); | |
433 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid)); | |
434 | req->credit_dack = htonl(dack | V_RX_CREDITS(credits)); | |
435 | skb->priority = CPL_PRIORITY_ACK; | |
436 | cxgb3_ofld_send(c3cn->cdev, skb); | |
437 | return credits; | |
438 | } | |
439 | ||
440 | /* | |
441 | * CPL connection tx data: host -> | |
442 | * | |
443 | * Send iscsi PDU via TX_DATA CPL message. Returns the number of | |
444 | * credits sent. | |
445 | * Each TX_DATA consumes work request credit (wrs), so we need to keep track of | |
446 | * how many we've used so far and how many are pending (i.e., yet ack'ed by T3). | |
447 | */ | |
448 | ||
449 | /* | |
450 | * For ULP connections HW may inserts digest bytes into the pdu. Those digest | |
451 | * bytes are not sent by the host but are part of the TCP payload and therefore | |
452 | * consume TCP sequence space. | |
453 | */ | |
454 | static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 }; | |
455 | static inline unsigned int ulp_extra_len(const struct sk_buff *skb) | |
456 | { | |
457 | return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3]; | |
458 | } | |
459 | ||
460 | static unsigned int wrlen __read_mostly; | |
461 | ||
462 | /* | |
463 | * The number of WRs needed for an skb depends on the number of fragments | |
464 | * in the skb and whether it has any payload in its main body. This maps the | |
465 | * length of the gather list represented by an skb into the # of necessary WRs. | |
1648b11e | 466 | * The extra two fragments are for iscsi bhs and payload padding. |
c3673464 | 467 | */ |
1648b11e | 468 | #define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2) |
c3673464 KX |
469 | static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly; |
470 | ||
471 | static void s3_init_wr_tab(unsigned int wr_len) | |
472 | { | |
473 | int i; | |
474 | ||
475 | if (skb_wrs[1]) /* already initialized */ | |
476 | return; | |
477 | ||
478 | for (i = 1; i < SKB_WR_LIST_SIZE; i++) { | |
479 | int sgl_len = (3 * i) / 2 + (i & 1); | |
480 | ||
481 | sgl_len += 3; | |
482 | skb_wrs[i] = (sgl_len <= wr_len | |
483 | ? 1 : 1 + (sgl_len - 2) / (wr_len - 1)); | |
484 | } | |
485 | ||
486 | wrlen = wr_len * 8; | |
487 | } | |
488 | ||
489 | static inline void reset_wr_list(struct s3_conn *c3cn) | |
490 | { | |
1648b11e | 491 | c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL; |
c3673464 KX |
492 | } |
493 | ||
494 | /* | |
495 | * Add a WR to a connections's list of pending WRs. This is a singly-linked | |
496 | * list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head | |
497 | * and the tail in wr_pending_tail. | |
498 | */ | |
499 | static inline void enqueue_wr(struct s3_conn *c3cn, | |
500 | struct sk_buff *skb) | |
501 | { | |
1648b11e | 502 | skb_tx_wr_next(skb) = NULL; |
c3673464 KX |
503 | |
504 | /* | |
505 | * We want to take an extra reference since both us and the driver | |
506 | * need to free the packet before it's really freed. We know there's | |
507 | * just one user currently so we use atomic_set rather than skb_get | |
508 | * to avoid the atomic op. | |
509 | */ | |
510 | atomic_set(&skb->users, 2); | |
511 | ||
512 | if (!c3cn->wr_pending_head) | |
513 | c3cn->wr_pending_head = skb; | |
514 | else | |
1648b11e | 515 | skb_tx_wr_next(c3cn->wr_pending_tail) = skb; |
c3673464 KX |
516 | c3cn->wr_pending_tail = skb; |
517 | } | |
518 | ||
1648b11e KX |
519 | static int count_pending_wrs(struct s3_conn *c3cn) |
520 | { | |
521 | int n = 0; | |
522 | const struct sk_buff *skb = c3cn->wr_pending_head; | |
523 | ||
524 | while (skb) { | |
525 | n += skb->csum; | |
526 | skb = skb_tx_wr_next(skb); | |
527 | } | |
528 | return n; | |
529 | } | |
530 | ||
c3673464 KX |
531 | static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn) |
532 | { | |
533 | return c3cn->wr_pending_head; | |
534 | } | |
535 | ||
536 | static inline void free_wr_skb(struct sk_buff *skb) | |
537 | { | |
538 | kfree_skb(skb); | |
539 | } | |
540 | ||
541 | static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn) | |
542 | { | |
543 | struct sk_buff *skb = c3cn->wr_pending_head; | |
544 | ||
545 | if (likely(skb)) { | |
546 | /* Don't bother clearing the tail */ | |
1648b11e KX |
547 | c3cn->wr_pending_head = skb_tx_wr_next(skb); |
548 | skb_tx_wr_next(skb) = NULL; | |
c3673464 KX |
549 | } |
550 | return skb; | |
551 | } | |
552 | ||
553 | static void purge_wr_queue(struct s3_conn *c3cn) | |
554 | { | |
555 | struct sk_buff *skb; | |
556 | while ((skb = dequeue_wr(c3cn)) != NULL) | |
557 | free_wr_skb(skb); | |
558 | } | |
559 | ||
560 | static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb, | |
1648b11e | 561 | int len, int req_completion) |
c3673464 KX |
562 | { |
563 | struct tx_data_wr *req; | |
564 | ||
565 | skb_reset_transport_header(skb); | |
566 | req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req)); | |
1648b11e KX |
567 | req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) | |
568 | (req_completion ? F_WR_COMPL : 0)); | |
c3673464 KX |
569 | req->wr_lo = htonl(V_WR_TID(c3cn->tid)); |
570 | req->sndseq = htonl(c3cn->snd_nxt); | |
571 | /* len includes the length of any HW ULP additions */ | |
572 | req->len = htonl(len); | |
573 | req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx)); | |
574 | /* V_TX_ULP_SUBMODE sets both the mode and submode */ | |
575 | req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) | | |
576 | V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1))); | |
577 | ||
578 | if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) { | |
579 | req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT | | |
580 | V_TX_CPU_IDX(c3cn->qset)); | |
581 | /* Sendbuffer is in units of 32KB. */ | |
582 | req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15)); | |
583 | c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT); | |
584 | } | |
585 | } | |
586 | ||
587 | /** | |
588 | * c3cn_push_tx_frames -- start transmit | |
589 | * @c3cn: the offloaded connection | |
590 | * @req_completion: request wr_ack or not | |
591 | * | |
592 | * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a | |
593 | * connection's send queue and sends them on to T3. Must be called with the | |
594 | * connection's lock held. Returns the amount of send buffer space that was | |
595 | * freed as a result of sending queued data to T3. | |
596 | */ | |
597 | static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb) | |
598 | { | |
599 | kfree_skb(skb); | |
600 | } | |
601 | ||
602 | static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion) | |
603 | { | |
604 | int total_size = 0; | |
605 | struct sk_buff *skb; | |
606 | struct t3cdev *cdev; | |
607 | struct cxgb3i_sdev_data *cdata; | |
608 | ||
609 | if (unlikely(c3cn->state == C3CN_STATE_CONNECTING || | |
610 | c3cn->state == C3CN_STATE_CLOSE_WAIT_1 || | |
1648b11e | 611 | c3cn->state >= C3CN_STATE_ABORTING)) { |
c3673464 KX |
612 | c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n", |
613 | c3cn, c3cn->state); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | cdev = c3cn->cdev; | |
618 | cdata = CXGB3_SDEV_DATA(cdev); | |
619 | ||
620 | while (c3cn->wr_avail | |
621 | && (skb = skb_peek(&c3cn->write_queue)) != NULL) { | |
622 | int len = skb->len; /* length before skb_push */ | |
623 | int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len); | |
624 | int wrs_needed = skb_wrs[frags]; | |
625 | ||
626 | if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen) | |
627 | wrs_needed = 1; | |
628 | ||
629 | WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1); | |
630 | ||
631 | if (c3cn->wr_avail < wrs_needed) { | |
632 | c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, " | |
633 | "wr %d < %u.\n", | |
1648b11e | 634 | c3cn, skb->len, skb->data_len, frags, |
c3673464 KX |
635 | wrs_needed, c3cn->wr_avail); |
636 | break; | |
637 | } | |
638 | ||
639 | __skb_unlink(skb, &c3cn->write_queue); | |
640 | skb->priority = CPL_PRIORITY_DATA; | |
641 | skb->csum = wrs_needed; /* remember this until the WR_ACK */ | |
642 | c3cn->wr_avail -= wrs_needed; | |
643 | c3cn->wr_unacked += wrs_needed; | |
644 | enqueue_wr(c3cn, skb); | |
645 | ||
1648b11e KX |
646 | c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, " |
647 | "wr %d, left %u, unack %u.\n", | |
648 | c3cn, skb->len, skb->data_len, frags, | |
649 | wrs_needed, c3cn->wr_avail, c3cn->wr_unacked); | |
650 | ||
c3673464 | 651 | |
1648b11e KX |
652 | if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) { |
653 | if ((req_completion && | |
654 | c3cn->wr_unacked == wrs_needed) || | |
655 | (skb_flags(skb) & C3CB_FLAG_COMPL) || | |
656 | c3cn->wr_unacked >= c3cn->wr_max / 2) { | |
657 | req_completion = 1; | |
c3673464 KX |
658 | c3cn->wr_unacked = 0; |
659 | } | |
1648b11e KX |
660 | len += ulp_extra_len(skb); |
661 | make_tx_data_wr(c3cn, skb, len, req_completion); | |
662 | c3cn->snd_nxt += len; | |
663 | skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR; | |
c3673464 KX |
664 | } |
665 | ||
666 | total_size += skb->truesize; | |
667 | set_arp_failure_handler(skb, arp_failure_discard); | |
668 | l2t_send(cdev, skb, c3cn->l2t); | |
669 | } | |
670 | return total_size; | |
671 | } | |
672 | ||
673 | /* | |
674 | * process_cpl_msg: -> host | |
675 | * Top-level CPL message processing used by most CPL messages that | |
676 | * pertain to connections. | |
677 | */ | |
678 | static inline void process_cpl_msg(void (*fn)(struct s3_conn *, | |
679 | struct sk_buff *), | |
680 | struct s3_conn *c3cn, | |
681 | struct sk_buff *skb) | |
682 | { | |
683 | spin_lock_bh(&c3cn->lock); | |
684 | fn(c3cn, skb); | |
685 | spin_unlock_bh(&c3cn->lock); | |
686 | } | |
687 | ||
688 | /* | |
689 | * process_cpl_msg_ref: -> host | |
690 | * Similar to process_cpl_msg() but takes an extra connection reference around | |
691 | * the call to the handler. Should be used if the handler may drop a | |
692 | * connection reference. | |
693 | */ | |
694 | static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *, | |
695 | struct sk_buff *), | |
696 | struct s3_conn *c3cn, | |
697 | struct sk_buff *skb) | |
698 | { | |
699 | c3cn_hold(c3cn); | |
700 | process_cpl_msg(fn, c3cn, skb); | |
701 | c3cn_put(c3cn); | |
702 | } | |
703 | ||
704 | /* | |
705 | * Process a CPL_ACT_ESTABLISH message: -> host | |
706 | * Updates connection state from an active establish CPL message. Runs with | |
707 | * the connection lock held. | |
708 | */ | |
709 | ||
710 | static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid) | |
711 | { | |
712 | struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid); | |
713 | if (c3cn) | |
714 | c3cn_put(c3cn); | |
715 | } | |
716 | ||
717 | static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn, | |
718 | unsigned int opt) | |
719 | { | |
720 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); | |
721 | ||
722 | c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn; | |
723 | ||
724 | /* | |
725 | * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't | |
726 | * pass through opt0. | |
727 | */ | |
728 | if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10)) | |
729 | c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10); | |
730 | ||
731 | dst_confirm(c3cn->dst_cache); | |
732 | ||
733 | smp_mb(); | |
734 | ||
735 | c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED); | |
736 | } | |
737 | ||
738 | static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb) | |
739 | { | |
740 | struct cpl_act_establish *req = cplhdr(skb); | |
741 | u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */ | |
742 | ||
743 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
744 | c3cn, c3cn->state, c3cn->flags); | |
745 | ||
746 | if (unlikely(c3cn->state != C3CN_STATE_CONNECTING)) | |
747 | cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n", | |
748 | c3cn->tid, c3cn->state); | |
749 | ||
750 | c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn; | |
751 | c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt)); | |
752 | ||
753 | __kfree_skb(skb); | |
754 | ||
755 | if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED))) | |
756 | /* upper layer has requested closing */ | |
757 | send_abort_req(c3cn); | |
1648b11e KX |
758 | else { |
759 | if (skb_queue_len(&c3cn->write_queue)) | |
760 | c3cn_push_tx_frames(c3cn, 1); | |
c3673464 | 761 | cxgb3i_conn_tx_open(c3cn); |
1648b11e | 762 | } |
c3673464 KX |
763 | } |
764 | ||
765 | static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb, | |
766 | void *ctx) | |
767 | { | |
768 | struct cpl_act_establish *req = cplhdr(skb); | |
769 | unsigned int tid = GET_TID(req); | |
770 | unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid)); | |
771 | struct s3_conn *c3cn = ctx; | |
772 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); | |
773 | ||
774 | c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", | |
775 | tid, c3cn, c3cn->state, c3cn->flags); | |
776 | ||
777 | c3cn->tid = tid; | |
778 | c3cn_hold(c3cn); | |
779 | cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid); | |
780 | s3_free_atid(cdev, atid); | |
781 | ||
782 | c3cn->qset = G_QNUM(ntohl(skb->csum)); | |
783 | ||
784 | process_cpl_msg(process_act_establish, c3cn, skb); | |
785 | return 0; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Process a CPL_ACT_OPEN_RPL message: -> host | |
790 | * Handle active open failures. | |
791 | */ | |
792 | static int act_open_rpl_status_to_errno(int status) | |
793 | { | |
794 | switch (status) { | |
795 | case CPL_ERR_CONN_RESET: | |
0109abff | 796 | return -ECONNREFUSED; |
c3673464 | 797 | case CPL_ERR_ARP_MISS: |
0109abff | 798 | return -EHOSTUNREACH; |
c3673464 | 799 | case CPL_ERR_CONN_TIMEDOUT: |
0109abff | 800 | return -ETIMEDOUT; |
c3673464 | 801 | case CPL_ERR_TCAM_FULL: |
0109abff | 802 | return -ENOMEM; |
c3673464 KX |
803 | case CPL_ERR_CONN_EXIST: |
804 | cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n"); | |
0109abff | 805 | return -EADDRINUSE; |
c3673464 | 806 | default: |
0109abff | 807 | return -EIO; |
c3673464 KX |
808 | } |
809 | } | |
810 | ||
811 | static void act_open_retry_timer(unsigned long data) | |
812 | { | |
813 | struct sk_buff *skb; | |
814 | struct s3_conn *c3cn = (struct s3_conn *)data; | |
815 | ||
816 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); | |
817 | ||
818 | spin_lock_bh(&c3cn->lock); | |
819 | skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC); | |
820 | if (!skb) | |
0109abff | 821 | fail_act_open(c3cn, -ENOMEM); |
c3673464 KX |
822 | else { |
823 | skb->sk = (struct sock *)c3cn; | |
824 | set_arp_failure_handler(skb, act_open_req_arp_failure); | |
825 | make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); | |
826 | l2t_send(c3cn->cdev, skb, c3cn->l2t); | |
827 | } | |
828 | spin_unlock_bh(&c3cn->lock); | |
829 | c3cn_put(c3cn); | |
830 | } | |
831 | ||
832 | static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb) | |
833 | { | |
834 | struct cpl_act_open_rpl *rpl = cplhdr(skb); | |
835 | ||
836 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
837 | c3cn, c3cn->state, c3cn->flags); | |
838 | ||
839 | if (rpl->status == CPL_ERR_CONN_EXIST && | |
840 | c3cn->retry_timer.function != act_open_retry_timer) { | |
841 | c3cn->retry_timer.function = act_open_retry_timer; | |
842 | if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2)) | |
843 | c3cn_hold(c3cn); | |
844 | } else | |
845 | fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status)); | |
846 | __kfree_skb(skb); | |
847 | } | |
848 | ||
849 | static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) | |
850 | { | |
851 | struct s3_conn *c3cn = ctx; | |
852 | struct cpl_act_open_rpl *rpl = cplhdr(skb); | |
853 | ||
854 | c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", | |
855 | rpl->status, c3cn, c3cn->state, c3cn->flags); | |
856 | ||
857 | if (rpl->status != CPL_ERR_TCAM_FULL && | |
858 | rpl->status != CPL_ERR_CONN_EXIST && | |
859 | rpl->status != CPL_ERR_ARP_MISS) | |
860 | cxgb3_queue_tid_release(cdev, GET_TID(rpl)); | |
861 | ||
862 | process_cpl_msg_ref(process_act_open_rpl, c3cn, skb); | |
863 | return 0; | |
864 | } | |
865 | ||
866 | /* | |
867 | * Process PEER_CLOSE CPL messages: -> host | |
868 | * Handle peer FIN. | |
869 | */ | |
870 | static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb) | |
871 | { | |
872 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
873 | c3cn, c3cn->state, c3cn->flags); | |
874 | ||
875 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) | |
876 | goto out; | |
877 | ||
878 | switch (c3cn->state) { | |
879 | case C3CN_STATE_ESTABLISHED: | |
880 | c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE); | |
881 | break; | |
882 | case C3CN_STATE_ACTIVE_CLOSE: | |
883 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); | |
884 | break; | |
885 | case C3CN_STATE_CLOSE_WAIT_1: | |
886 | c3cn_closed(c3cn); | |
887 | break; | |
888 | case C3CN_STATE_ABORTING: | |
889 | break; | |
890 | default: | |
891 | cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n", | |
892 | c3cn->cdev->name, c3cn->tid, c3cn->state); | |
893 | } | |
894 | ||
895 | cxgb3i_conn_closing(c3cn); | |
896 | out: | |
897 | __kfree_skb(skb); | |
898 | } | |
899 | ||
900 | static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) | |
901 | { | |
902 | struct s3_conn *c3cn = ctx; | |
903 | ||
904 | c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", | |
905 | c3cn, c3cn->state, c3cn->flags); | |
906 | process_cpl_msg_ref(process_peer_close, c3cn, skb); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /* | |
911 | * Process CLOSE_CONN_RPL CPL message: -> host | |
912 | * Process a peer ACK to our FIN. | |
913 | */ | |
914 | static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb) | |
915 | { | |
916 | struct cpl_close_con_rpl *rpl = cplhdr(skb); | |
917 | ||
918 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
919 | c3cn, c3cn->state, c3cn->flags); | |
920 | ||
921 | c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */ | |
922 | ||
923 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) | |
924 | goto out; | |
925 | ||
926 | switch (c3cn->state) { | |
927 | case C3CN_STATE_ACTIVE_CLOSE: | |
928 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1); | |
929 | break; | |
930 | case C3CN_STATE_CLOSE_WAIT_1: | |
931 | case C3CN_STATE_CLOSE_WAIT_2: | |
932 | c3cn_closed(c3cn); | |
933 | break; | |
934 | case C3CN_STATE_ABORTING: | |
935 | break; | |
936 | default: | |
937 | cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n", | |
938 | c3cn->cdev->name, c3cn->tid, c3cn->state); | |
939 | } | |
940 | ||
941 | out: | |
942 | kfree_skb(skb); | |
943 | } | |
944 | ||
945 | static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb, | |
946 | void *ctx) | |
947 | { | |
948 | struct s3_conn *c3cn = ctx; | |
949 | ||
950 | c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", | |
951 | c3cn, c3cn->state, c3cn->flags); | |
952 | ||
953 | process_cpl_msg_ref(process_close_con_rpl, c3cn, skb); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | /* | |
958 | * Process ABORT_REQ_RSS CPL message: -> host | |
959 | * Process abort requests. If we are waiting for an ABORT_RPL we ignore this | |
960 | * request except that we need to reply to it. | |
961 | */ | |
962 | ||
963 | static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason, | |
964 | int *need_rst) | |
965 | { | |
966 | switch (abort_reason) { | |
967 | case CPL_ERR_BAD_SYN: /* fall through */ | |
968 | case CPL_ERR_CONN_RESET: | |
969 | return c3cn->state > C3CN_STATE_ESTABLISHED ? | |
0109abff | 970 | -EPIPE : -ECONNRESET; |
c3673464 KX |
971 | case CPL_ERR_XMIT_TIMEDOUT: |
972 | case CPL_ERR_PERSIST_TIMEDOUT: | |
973 | case CPL_ERR_FINWAIT2_TIMEDOUT: | |
974 | case CPL_ERR_KEEPALIVE_TIMEDOUT: | |
0109abff | 975 | return -ETIMEDOUT; |
c3673464 | 976 | default: |
0109abff | 977 | return -EIO; |
c3673464 KX |
978 | } |
979 | } | |
980 | ||
981 | static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb) | |
982 | { | |
983 | int rst_status = CPL_ABORT_NO_RST; | |
984 | const struct cpl_abort_req_rss *req = cplhdr(skb); | |
985 | ||
986 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
987 | c3cn, c3cn->state, c3cn->flags); | |
988 | ||
989 | if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) { | |
990 | c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD); | |
991 | c3cn_set_state(c3cn, C3CN_STATE_ABORTING); | |
992 | __kfree_skb(skb); | |
993 | return; | |
994 | } | |
995 | ||
996 | c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD); | |
997 | send_abort_rpl(c3cn, rst_status); | |
998 | ||
999 | if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { | |
1000 | c3cn->err = | |
1001 | abort_status_to_errno(c3cn, req->status, &rst_status); | |
1002 | c3cn_closed(c3cn); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) | |
1007 | { | |
1008 | const struct cpl_abort_req_rss *req = cplhdr(skb); | |
1009 | struct s3_conn *c3cn = ctx; | |
1010 | ||
1011 | c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n", | |
1012 | c3cn, c3cn->state, c3cn->flags); | |
1013 | ||
1014 | if (req->status == CPL_ERR_RTX_NEG_ADVICE || | |
1015 | req->status == CPL_ERR_PERSIST_NEG_ADVICE) { | |
1016 | __kfree_skb(skb); | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | process_cpl_msg_ref(process_abort_req, c3cn, skb); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Process ABORT_RPL_RSS CPL message: -> host | |
1026 | * Process abort replies. We only process these messages if we anticipate | |
1027 | * them as the coordination between SW and HW in this area is somewhat lacking | |
1028 | * and sometimes we get ABORT_RPLs after we are done with the connection that | |
1029 | * originated the ABORT_REQ. | |
1030 | */ | |
1031 | static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb) | |
1032 | { | |
1033 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
1034 | c3cn, c3cn->state, c3cn->flags); | |
1035 | ||
1036 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { | |
1037 | if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD)) | |
1038 | c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD); | |
1039 | else { | |
1040 | c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD); | |
1041 | c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING); | |
1042 | if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) | |
1043 | cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n", | |
1044 | c3cn->cdev->name, c3cn->tid); | |
1045 | c3cn_closed(c3cn); | |
1046 | } | |
1047 | } | |
1048 | __kfree_skb(skb); | |
1049 | } | |
1050 | ||
1051 | static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) | |
1052 | { | |
1053 | struct cpl_abort_rpl_rss *rpl = cplhdr(skb); | |
1054 | struct s3_conn *c3cn = ctx; | |
1055 | ||
1056 | c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n", | |
1057 | rpl->status, c3cn, c3cn ? c3cn->state : 0, | |
1058 | c3cn ? c3cn->flags : 0UL); | |
1059 | ||
1060 | /* | |
1061 | * Ignore replies to post-close aborts indicating that the abort was | |
1062 | * requested too late. These connections are terminated when we get | |
1063 | * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss | |
1064 | * arrives the TID is either no longer used or it has been recycled. | |
1065 | */ | |
1066 | if (rpl->status == CPL_ERR_ABORT_FAILED) | |
1067 | goto discard; | |
1068 | ||
1069 | /* | |
1070 | * Sometimes we've already closed the connection, e.g., a post-close | |
1071 | * abort races with ABORT_REQ_RSS, the latter frees the connection | |
1072 | * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED, | |
1073 | * but FW turns the ABORT_REQ into a regular one and so we get | |
1074 | * ABORT_RPL_RSS with status 0 and no connection. | |
1075 | */ | |
1076 | if (!c3cn) | |
1077 | goto discard; | |
1078 | ||
1079 | process_cpl_msg_ref(process_abort_rpl, c3cn, skb); | |
1080 | return 0; | |
1081 | ||
1082 | discard: | |
1083 | __kfree_skb(skb); | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Process RX_ISCSI_HDR CPL message: -> host | |
1089 | * Handle received PDUs, the payload could be DDP'ed. If not, the payload | |
1090 | * follow after the bhs. | |
1091 | */ | |
1092 | static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb) | |
1093 | { | |
1094 | struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb); | |
1095 | struct cpl_iscsi_hdr_norss data_cpl; | |
1096 | struct cpl_rx_data_ddp_norss ddp_cpl; | |
1097 | unsigned int hdr_len, data_len, status; | |
1098 | unsigned int len; | |
1099 | int err; | |
1100 | ||
1101 | if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) { | |
1102 | if (c3cn->state != C3CN_STATE_ABORTING) | |
1103 | send_abort_req(c3cn); | |
1104 | __kfree_skb(skb); | |
1105 | return; | |
1106 | } | |
1107 | ||
1648b11e KX |
1108 | skb_tcp_seq(skb) = ntohl(hdr_cpl->seq); |
1109 | skb_flags(skb) = 0; | |
c3673464 KX |
1110 | |
1111 | skb_reset_transport_header(skb); | |
1112 | __skb_pull(skb, sizeof(struct cpl_iscsi_hdr)); | |
1113 | ||
1114 | len = hdr_len = ntohs(hdr_cpl->len); | |
1115 | /* msg coalesce is off or not enough data received */ | |
1116 | if (skb->len <= hdr_len) { | |
1117 | cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n", | |
1118 | c3cn->cdev->name, c3cn->tid, | |
1119 | skb->len, hdr_len); | |
1120 | goto abort_conn; | |
1121 | } | |
1122 | ||
1123 | err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl, | |
1124 | sizeof(ddp_cpl)); | |
1125 | if (err < 0) | |
1126 | goto abort_conn; | |
1127 | ||
1128 | skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY; | |
1648b11e KX |
1129 | skb_rx_pdulen(skb) = ntohs(ddp_cpl.len); |
1130 | skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc); | |
c3673464 KX |
1131 | status = ntohl(ddp_cpl.ddp_status); |
1132 | ||
1133 | c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n", | |
1648b11e | 1134 | skb, skb->len, skb_rx_pdulen(skb), status); |
c3673464 KX |
1135 | |
1136 | if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT)) | |
1137 | skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR; | |
1138 | if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT)) | |
1139 | skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR; | |
1140 | if (status & (1 << RX_DDP_STATUS_PAD_SHIFT)) | |
1141 | skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR; | |
1142 | ||
1143 | if (skb->len > (hdr_len + sizeof(ddp_cpl))) { | |
1144 | err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl)); | |
1145 | if (err < 0) | |
1146 | goto abort_conn; | |
1147 | data_len = ntohs(data_cpl.len); | |
1148 | len += sizeof(data_cpl) + data_len; | |
1149 | } else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT)) | |
1150 | skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED; | |
1151 | ||
1648b11e | 1152 | c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb); |
c3673464 KX |
1153 | __pskb_trim(skb, len); |
1154 | __skb_queue_tail(&c3cn->receive_queue, skb); | |
1155 | cxgb3i_conn_pdu_ready(c3cn); | |
1156 | ||
1157 | return; | |
1158 | ||
1159 | abort_conn: | |
1160 | send_abort_req(c3cn); | |
1161 | __kfree_skb(skb); | |
1162 | } | |
1163 | ||
1164 | static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx) | |
1165 | { | |
1166 | struct s3_conn *c3cn = ctx; | |
1167 | ||
1168 | process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb); | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Process TX_DATA_ACK CPL messages: -> host | |
1174 | * Process an acknowledgment of WR completion. Advance snd_una and send the | |
1175 | * next batch of work requests from the write queue. | |
1176 | */ | |
1648b11e KX |
1177 | static void check_wr_invariants(struct s3_conn *c3cn) |
1178 | { | |
1179 | int pending = count_pending_wrs(c3cn); | |
1180 | ||
1181 | if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max)) | |
1182 | cxgb3i_log_error("TID %u: credit imbalance: avail %u, " | |
1183 | "pending %u, total should be %u\n", | |
1184 | c3cn->tid, c3cn->wr_avail, pending, | |
1185 | c3cn->wr_max); | |
1186 | } | |
1187 | ||
c3673464 KX |
1188 | static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb) |
1189 | { | |
1190 | struct cpl_wr_ack *hdr = cplhdr(skb); | |
1191 | unsigned int credits = ntohs(hdr->credits); | |
1192 | u32 snd_una = ntohl(hdr->snd_una); | |
1193 | ||
1648b11e KX |
1194 | c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n", |
1195 | credits, c3cn->wr_avail, c3cn->wr_unacked, | |
1196 | c3cn->tid, c3cn->state); | |
1197 | ||
c3673464 KX |
1198 | c3cn->wr_avail += credits; |
1199 | if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail) | |
1200 | c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail; | |
1201 | ||
1202 | while (credits) { | |
1203 | struct sk_buff *p = peek_wr(c3cn); | |
1204 | ||
1205 | if (unlikely(!p)) { | |
1206 | cxgb3i_log_error("%u WR_ACK credits for TID %u with " | |
1207 | "nothing pending, state %u\n", | |
1208 | credits, c3cn->tid, c3cn->state); | |
1209 | break; | |
1210 | } | |
1211 | if (unlikely(credits < p->csum)) { | |
1648b11e KX |
1212 | struct tx_data_wr *w = cplhdr(p); |
1213 | cxgb3i_log_error("TID %u got %u WR credits need %u, " | |
1214 | "len %u, main body %u, frags %u, " | |
1215 | "seq # %u, ACK una %u, ACK nxt %u, " | |
1216 | "WR_AVAIL %u, WRs pending %u\n", | |
1217 | c3cn->tid, credits, p->csum, p->len, | |
1218 | p->len - p->data_len, | |
1219 | skb_shinfo(p)->nr_frags, | |
1220 | ntohl(w->sndseq), snd_una, | |
1221 | ntohl(hdr->snd_nxt), c3cn->wr_avail, | |
1222 | count_pending_wrs(c3cn) - credits); | |
c3673464 KX |
1223 | p->csum -= credits; |
1224 | break; | |
1225 | } else { | |
1226 | dequeue_wr(c3cn); | |
1227 | credits -= p->csum; | |
1228 | free_wr_skb(p); | |
1229 | } | |
1230 | } | |
1231 | ||
1648b11e KX |
1232 | check_wr_invariants(c3cn); |
1233 | ||
1234 | if (unlikely(before(snd_una, c3cn->snd_una))) { | |
1235 | cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK " | |
1236 | "snd_una %u\n", | |
1237 | c3cn->tid, snd_una, c3cn->snd_una); | |
c3673464 | 1238 | goto out_free; |
1648b11e | 1239 | } |
c3673464 KX |
1240 | |
1241 | if (c3cn->snd_una != snd_una) { | |
1242 | c3cn->snd_una = snd_una; | |
1243 | dst_confirm(c3cn->dst_cache); | |
1244 | } | |
1245 | ||
1648b11e KX |
1246 | if (skb_queue_len(&c3cn->write_queue)) { |
1247 | if (c3cn_push_tx_frames(c3cn, 0)) | |
1248 | cxgb3i_conn_tx_open(c3cn); | |
1249 | } else | |
c3673464 KX |
1250 | cxgb3i_conn_tx_open(c3cn); |
1251 | out_free: | |
1252 | __kfree_skb(skb); | |
1253 | } | |
1254 | ||
1255 | static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) | |
1256 | { | |
1257 | struct s3_conn *c3cn = ctx; | |
1258 | ||
1259 | process_cpl_msg(process_wr_ack, c3cn, skb); | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * for each connection, pre-allocate skbs needed for close/abort requests. So | |
1265 | * that we can service the request right away. | |
1266 | */ | |
1267 | static void c3cn_free_cpl_skbs(struct s3_conn *c3cn) | |
1268 | { | |
1269 | if (c3cn->cpl_close) | |
1270 | kfree_skb(c3cn->cpl_close); | |
1271 | if (c3cn->cpl_abort_req) | |
1272 | kfree_skb(c3cn->cpl_abort_req); | |
1273 | if (c3cn->cpl_abort_rpl) | |
1274 | kfree_skb(c3cn->cpl_abort_rpl); | |
1275 | } | |
1276 | ||
1277 | static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn) | |
1278 | { | |
1279 | c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req), | |
1280 | GFP_KERNEL); | |
1281 | if (!c3cn->cpl_close) | |
1282 | return -ENOMEM; | |
1283 | skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req)); | |
1284 | ||
1285 | c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req), | |
1286 | GFP_KERNEL); | |
1287 | if (!c3cn->cpl_abort_req) | |
1288 | goto free_cpl_skbs; | |
1289 | skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req)); | |
1290 | ||
1291 | c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl), | |
1292 | GFP_KERNEL); | |
1293 | if (!c3cn->cpl_abort_rpl) | |
1294 | goto free_cpl_skbs; | |
1295 | skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl)); | |
1296 | ||
1297 | return 0; | |
1298 | ||
1299 | free_cpl_skbs: | |
1300 | c3cn_free_cpl_skbs(c3cn); | |
1301 | return -ENOMEM; | |
1302 | } | |
1303 | ||
1304 | /** | |
1305 | * c3cn_release_offload_resources - release offload resource | |
1306 | * @c3cn: the offloaded iscsi tcp connection. | |
1307 | * Release resources held by an offload connection (TID, L2T entry, etc.) | |
1308 | */ | |
1309 | static void c3cn_release_offload_resources(struct s3_conn *c3cn) | |
1310 | { | |
1311 | struct t3cdev *cdev = c3cn->cdev; | |
1312 | unsigned int tid = c3cn->tid; | |
1313 | ||
c3673464 | 1314 | c3cn->qset = 0; |
c3673464 KX |
1315 | c3cn_free_cpl_skbs(c3cn); |
1316 | ||
1317 | if (c3cn->wr_avail != c3cn->wr_max) { | |
1318 | purge_wr_queue(c3cn); | |
1319 | reset_wr_list(c3cn); | |
1320 | } | |
1321 | ||
2a90030f KX |
1322 | if (cdev) { |
1323 | if (c3cn->l2t) { | |
1324 | l2t_release(L2DATA(cdev), c3cn->l2t); | |
1325 | c3cn->l2t = NULL; | |
1326 | } | |
1327 | if (c3cn->state == C3CN_STATE_CONNECTING) | |
1328 | /* we have ATID */ | |
1329 | s3_free_atid(cdev, tid); | |
1330 | else { | |
1331 | /* we have TID */ | |
1332 | cxgb3_remove_tid(cdev, (void *)c3cn, tid); | |
1333 | c3cn_put(c3cn); | |
1334 | } | |
c3673464 KX |
1335 | } |
1336 | ||
2a90030f | 1337 | c3cn->dst_cache = NULL; |
c3673464 KX |
1338 | c3cn->cdev = NULL; |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure | |
1343 | * returns the s3_conn structure allocated. | |
1344 | */ | |
1345 | struct s3_conn *cxgb3i_c3cn_create(void) | |
1346 | { | |
1347 | struct s3_conn *c3cn; | |
1348 | ||
1349 | c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL); | |
1350 | if (!c3cn) | |
1351 | return NULL; | |
1352 | ||
1353 | /* pre-allocate close/abort cpl, so we don't need to wait for memory | |
1354 | when close/abort is requested. */ | |
1355 | if (c3cn_alloc_cpl_skbs(c3cn) < 0) | |
1356 | goto free_c3cn; | |
1357 | ||
1358 | c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn); | |
1359 | ||
1360 | c3cn->flags = 0; | |
1361 | spin_lock_init(&c3cn->lock); | |
1362 | atomic_set(&c3cn->refcnt, 1); | |
1363 | skb_queue_head_init(&c3cn->receive_queue); | |
1364 | skb_queue_head_init(&c3cn->write_queue); | |
1365 | setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn); | |
1366 | rwlock_init(&c3cn->callback_lock); | |
1367 | ||
1368 | return c3cn; | |
1369 | ||
1370 | free_c3cn: | |
1371 | kfree(c3cn); | |
1372 | return NULL; | |
1373 | } | |
1374 | ||
1375 | static void c3cn_active_close(struct s3_conn *c3cn) | |
1376 | { | |
1377 | int data_lost; | |
1378 | int close_req = 0; | |
1379 | ||
1380 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
1381 | c3cn, c3cn->state, c3cn->flags); | |
1382 | ||
1383 | dst_confirm(c3cn->dst_cache); | |
1384 | ||
1385 | c3cn_hold(c3cn); | |
1386 | spin_lock_bh(&c3cn->lock); | |
1387 | ||
1388 | data_lost = skb_queue_len(&c3cn->receive_queue); | |
1389 | __skb_queue_purge(&c3cn->receive_queue); | |
1390 | ||
1391 | switch (c3cn->state) { | |
1392 | case C3CN_STATE_CLOSED: | |
1393 | case C3CN_STATE_ACTIVE_CLOSE: | |
1394 | case C3CN_STATE_CLOSE_WAIT_1: | |
1395 | case C3CN_STATE_CLOSE_WAIT_2: | |
1396 | case C3CN_STATE_ABORTING: | |
1397 | /* nothing need to be done */ | |
1398 | break; | |
1399 | case C3CN_STATE_CONNECTING: | |
1400 | /* defer until cpl_act_open_rpl or cpl_act_establish */ | |
1401 | c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); | |
1402 | break; | |
1403 | case C3CN_STATE_ESTABLISHED: | |
1404 | close_req = 1; | |
1405 | c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE); | |
1406 | break; | |
1407 | case C3CN_STATE_PASSIVE_CLOSE: | |
1408 | close_req = 1; | |
1409 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); | |
1410 | break; | |
1411 | } | |
1412 | ||
1413 | if (close_req) { | |
1414 | if (data_lost) | |
1415 | /* Unread data was tossed, zap the connection. */ | |
1416 | send_abort_req(c3cn); | |
1417 | else | |
1418 | send_close_req(c3cn); | |
1419 | } | |
1420 | ||
1421 | spin_unlock_bh(&c3cn->lock); | |
1422 | c3cn_put(c3cn); | |
1423 | } | |
1424 | ||
1425 | /** | |
2a90030f KX |
1426 | * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any |
1427 | * resource held | |
c3673464 KX |
1428 | * @c3cn: the iscsi tcp connection |
1429 | */ | |
1430 | void cxgb3i_c3cn_release(struct s3_conn *c3cn) | |
1431 | { | |
1432 | c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n", | |
1433 | c3cn, c3cn->state, c3cn->flags); | |
2a90030f | 1434 | if (unlikely(c3cn->state == C3CN_STATE_CONNECTING)) |
c3673464 | 1435 | c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); |
2a90030f KX |
1436 | else if (likely(c3cn->state != C3CN_STATE_CLOSED)) |
1437 | c3cn_active_close(c3cn); | |
c3673464 KX |
1438 | c3cn_put(c3cn); |
1439 | } | |
1440 | ||
1441 | static int is_cxgb3_dev(struct net_device *dev) | |
1442 | { | |
1443 | struct cxgb3i_sdev_data *cdata; | |
44214ab4 RR |
1444 | struct net_device *ndev = dev; |
1445 | ||
1446 | if (dev->priv_flags & IFF_802_1Q_VLAN) | |
1447 | ndev = vlan_dev_real_dev(dev); | |
c3673464 KX |
1448 | |
1449 | write_lock(&cdata_rwlock); | |
1450 | list_for_each_entry(cdata, &cdata_list, list) { | |
1451 | struct adap_ports *ports = &cdata->ports; | |
1452 | int i; | |
1453 | ||
1454 | for (i = 0; i < ports->nports; i++) | |
44214ab4 | 1455 | if (ndev == ports->lldevs[i]) { |
c3673464 KX |
1456 | write_unlock(&cdata_rwlock); |
1457 | return 1; | |
1458 | } | |
1459 | } | |
1460 | write_unlock(&cdata_rwlock); | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | /** | |
1465 | * cxgb3_egress_dev - return the cxgb3 egress device | |
1466 | * @root_dev: the root device anchoring the search | |
1467 | * @c3cn: the connection used to determine egress port in bonding mode | |
1468 | * @context: in bonding mode, indicates a connection set up or failover | |
1469 | * | |
1470 | * Return egress device or NULL if the egress device isn't one of our ports. | |
1471 | */ | |
1472 | static struct net_device *cxgb3_egress_dev(struct net_device *root_dev, | |
1473 | struct s3_conn *c3cn, | |
1474 | int context) | |
1475 | { | |
1476 | while (root_dev) { | |
1477 | if (root_dev->priv_flags & IFF_802_1Q_VLAN) | |
1478 | root_dev = vlan_dev_real_dev(root_dev); | |
1479 | else if (is_cxgb3_dev(root_dev)) | |
1480 | return root_dev; | |
1481 | else | |
1482 | return NULL; | |
1483 | } | |
1484 | return NULL; | |
1485 | } | |
1486 | ||
10eb0f01 MC |
1487 | static struct rtable *find_route(struct net_device *dev, |
1488 | __be32 saddr, __be32 daddr, | |
c3673464 KX |
1489 | __be16 sport, __be16 dport) |
1490 | { | |
1491 | struct rtable *rt; | |
1492 | struct flowi fl = { | |
10eb0f01 | 1493 | .oif = dev ? dev->ifindex : 0, |
c3673464 KX |
1494 | .nl_u = { |
1495 | .ip4_u = { | |
1496 | .daddr = daddr, | |
1497 | .saddr = saddr, | |
1498 | .tos = 0 } }, | |
1499 | .proto = IPPROTO_TCP, | |
1500 | .uli_u = { | |
1501 | .ports = { | |
1502 | .sport = sport, | |
1503 | .dport = dport } } }; | |
1504 | ||
1505 | if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0)) | |
1506 | return NULL; | |
1507 | return rt; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * Assign offload parameters to some connection fields. | |
1512 | */ | |
1513 | static void init_offload_conn(struct s3_conn *c3cn, | |
1514 | struct t3cdev *cdev, | |
1515 | struct dst_entry *dst) | |
1516 | { | |
1517 | BUG_ON(c3cn->cdev != cdev); | |
1648b11e | 1518 | c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1; |
c3673464 KX |
1519 | c3cn->wr_unacked = 0; |
1520 | c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst)); | |
1521 | ||
1522 | reset_wr_list(c3cn); | |
1523 | } | |
1524 | ||
1525 | static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev) | |
1526 | { | |
1527 | struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev); | |
1528 | struct t3cdev *cdev = cdata->cdev; | |
1529 | struct dst_entry *dst = c3cn->dst_cache; | |
1530 | struct sk_buff *skb; | |
1531 | ||
1532 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", | |
1533 | c3cn, c3cn->state, c3cn->flags); | |
1534 | /* | |
1535 | * Initialize connection data. Note that the flags and ULP mode are | |
1536 | * initialized higher up ... | |
1537 | */ | |
1538 | c3cn->dev = dev; | |
1539 | c3cn->cdev = cdev; | |
1540 | c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn); | |
1541 | if (c3cn->tid < 0) | |
1542 | goto out_err; | |
1543 | ||
1544 | c3cn->qset = 0; | |
1545 | c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev); | |
1546 | if (!c3cn->l2t) | |
1547 | goto free_tid; | |
1548 | ||
1549 | skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL); | |
1550 | if (!skb) | |
1551 | goto free_l2t; | |
1552 | ||
1553 | skb->sk = (struct sock *)c3cn; | |
1554 | set_arp_failure_handler(skb, act_open_req_arp_failure); | |
1555 | ||
1556 | c3cn_hold(c3cn); | |
1557 | ||
1558 | init_offload_conn(c3cn, cdev, dst); | |
1559 | c3cn->err = 0; | |
1560 | ||
1561 | make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); | |
1562 | l2t_send(cdev, skb, c3cn->l2t); | |
1563 | return 0; | |
1564 | ||
1565 | free_l2t: | |
1566 | l2t_release(L2DATA(cdev), c3cn->l2t); | |
1567 | free_tid: | |
1568 | s3_free_atid(cdev, c3cn->tid); | |
1569 | c3cn->tid = 0; | |
1570 | out_err: | |
0109abff | 1571 | return -EINVAL; |
c3673464 KX |
1572 | } |
1573 | ||
44214ab4 RR |
1574 | /** |
1575 | * cxgb3i_find_dev - find the interface associated with the given address | |
1576 | * @ipaddr: ip address | |
1577 | */ | |
1578 | static struct net_device * | |
1579 | cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr) | |
1580 | { | |
1581 | struct flowi fl; | |
1582 | int err; | |
1583 | struct rtable *rt; | |
1584 | ||
1585 | memset(&fl, 0, sizeof(fl)); | |
1586 | fl.nl_u.ip4_u.daddr = ipaddr; | |
1587 | ||
1588 | err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl); | |
1589 | if (!err) | |
d8d1f30b | 1590 | return (&rt->dst)->dev; |
44214ab4 RR |
1591 | |
1592 | return NULL; | |
1593 | } | |
c3673464 KX |
1594 | |
1595 | /** | |
1596 | * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address | |
1597 | * @c3cn: the iscsi tcp connection | |
1598 | * @usin: destination address | |
1599 | * | |
1600 | * return 0 if active open request is sent, < 0 otherwise. | |
1601 | */ | |
10eb0f01 MC |
1602 | int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn, |
1603 | struct sockaddr_in *usin) | |
c3673464 KX |
1604 | { |
1605 | struct rtable *rt; | |
c3673464 KX |
1606 | struct cxgb3i_sdev_data *cdata; |
1607 | struct t3cdev *cdev; | |
1608 | __be32 sipv4; | |
44214ab4 | 1609 | struct net_device *dstdev; |
c3673464 KX |
1610 | int err; |
1611 | ||
10eb0f01 MC |
1612 | c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev); |
1613 | ||
c3673464 KX |
1614 | if (usin->sin_family != AF_INET) |
1615 | return -EAFNOSUPPORT; | |
1616 | ||
1617 | c3cn->daddr.sin_port = usin->sin_port; | |
1618 | c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr; | |
1619 | ||
44214ab4 RR |
1620 | dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr); |
1621 | if (!dstdev || !is_cxgb3_dev(dstdev)) | |
1622 | return -ENETUNREACH; | |
1623 | ||
1624 | if (dstdev->priv_flags & IFF_802_1Q_VLAN) | |
1625 | dev = dstdev; | |
1626 | ||
10eb0f01 | 1627 | rt = find_route(dev, c3cn->saddr.sin_addr.s_addr, |
c3673464 KX |
1628 | c3cn->daddr.sin_addr.s_addr, |
1629 | c3cn->saddr.sin_port, | |
1630 | c3cn->daddr.sin_port); | |
1631 | if (rt == NULL) { | |
10eb0f01 | 1632 | c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n", |
c3673464 | 1633 | c3cn->daddr.sin_addr.s_addr, |
10eb0f01 MC |
1634 | ntohs(c3cn->daddr.sin_port), |
1635 | dev ? dev->name : "any"); | |
c3673464 KX |
1636 | return -ENETUNREACH; |
1637 | } | |
1638 | ||
1639 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
10eb0f01 | 1640 | c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n", |
c3673464 | 1641 | c3cn->daddr.sin_addr.s_addr, |
10eb0f01 MC |
1642 | ntohs(c3cn->daddr.sin_port), |
1643 | dev ? dev->name : "any"); | |
c3673464 KX |
1644 | ip_rt_put(rt); |
1645 | return -ENETUNREACH; | |
1646 | } | |
1647 | ||
1648 | if (!c3cn->saddr.sin_addr.s_addr) | |
1649 | c3cn->saddr.sin_addr.s_addr = rt->rt_src; | |
1650 | ||
1651 | /* now commit destination to connection */ | |
d8d1f30b | 1652 | c3cn->dst_cache = &rt->dst; |
c3673464 KX |
1653 | |
1654 | /* try to establish an offloaded connection */ | |
1655 | dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0); | |
1656 | if (dev == NULL) { | |
1657 | c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn); | |
1658 | return -ENETUNREACH; | |
1659 | } | |
1660 | cdata = NDEV2CDATA(dev); | |
1661 | cdev = cdata->cdev; | |
1662 | ||
1663 | /* get a source port if one hasn't been provided */ | |
1664 | err = c3cn_get_port(c3cn, cdata); | |
1665 | if (err) | |
1666 | return err; | |
1667 | ||
1668 | c3cn_conn_debug("c3cn 0x%p get port %u.\n", | |
1669 | c3cn, ntohs(c3cn->saddr.sin_port)); | |
1670 | ||
1671 | sipv4 = cxgb3i_get_private_ipv4addr(dev); | |
1672 | if (!sipv4) { | |
1673 | c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn); | |
1674 | sipv4 = c3cn->saddr.sin_addr.s_addr; | |
1675 | cxgb3i_set_private_ipv4addr(dev, sipv4); | |
1676 | } else | |
1677 | c3cn->saddr.sin_addr.s_addr = sipv4; | |
1678 | ||
d9573e7a JP |
1679 | c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n", |
1680 | c3cn, | |
1681 | &c3cn->saddr.sin_addr.s_addr, | |
c3673464 | 1682 | ntohs(c3cn->saddr.sin_port), |
d9573e7a | 1683 | &c3cn->daddr.sin_addr.s_addr, |
c3673464 KX |
1684 | ntohs(c3cn->daddr.sin_port)); |
1685 | ||
1686 | c3cn_set_state(c3cn, C3CN_STATE_CONNECTING); | |
1687 | if (!initiate_act_open(c3cn, dev)) | |
1688 | return 0; | |
1689 | ||
1690 | /* | |
1691 | * If we get here, we don't have an offload connection so simply | |
1692 | * return a failure. | |
1693 | */ | |
1694 | err = -ENOTSUPP; | |
1695 | ||
1696 | /* | |
1697 | * This trashes the connection and releases the local port, | |
1698 | * if necessary. | |
1699 | */ | |
1700 | c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn); | |
1701 | c3cn_set_state(c3cn, C3CN_STATE_CLOSED); | |
1702 | ip_rt_put(rt); | |
1703 | c3cn_put_port(c3cn); | |
c3673464 KX |
1704 | return err; |
1705 | } | |
1706 | ||
1707 | /** | |
1708 | * cxgb3i_c3cn_rx_credits - ack received tcp data. | |
1709 | * @c3cn: iscsi tcp connection | |
1710 | * @copied: # of bytes processed | |
1711 | * | |
1712 | * Called after some received data has been read. It returns RX credits | |
1713 | * to the HW for the amount of data processed. | |
1714 | */ | |
1715 | void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied) | |
1716 | { | |
1717 | struct t3cdev *cdev; | |
1718 | int must_send; | |
1719 | u32 credits, dack = 0; | |
1720 | ||
1721 | if (c3cn->state != C3CN_STATE_ESTABLISHED) | |
1722 | return; | |
1723 | ||
1724 | credits = c3cn->copied_seq - c3cn->rcv_wup; | |
1725 | if (unlikely(!credits)) | |
1726 | return; | |
1727 | ||
1728 | cdev = c3cn->cdev; | |
1729 | ||
1730 | if (unlikely(cxgb3_rx_credit_thres == 0)) | |
1731 | return; | |
1732 | ||
1733 | dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1); | |
1734 | ||
1735 | /* | |
1736 | * For coalescing to work effectively ensure the receive window has | |
1737 | * at least 16KB left. | |
1738 | */ | |
1739 | must_send = credits + 16384 >= cxgb3_rcv_win; | |
1740 | ||
1741 | if (must_send || credits >= cxgb3_rx_credit_thres) | |
1742 | c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack); | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus | |
1747 | * @c3cn: iscsi tcp connection | |
1748 | * @skb: skb contains the iscsi pdu | |
1749 | * | |
1750 | * Add a list of skbs to a connection send queue. The skbs must comply with | |
1751 | * the max size limit of the device and have a headroom of at least | |
1752 | * TX_HEADER_LEN bytes. | |
1753 | * Return # of bytes queued. | |
1754 | */ | |
1755 | int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb) | |
1756 | { | |
1757 | struct sk_buff *next; | |
1758 | int err, copied = 0; | |
1759 | ||
1760 | spin_lock_bh(&c3cn->lock); | |
1761 | ||
1762 | if (c3cn->state != C3CN_STATE_ESTABLISHED) { | |
1763 | c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n", | |
1764 | c3cn, c3cn->state); | |
1765 | err = -EAGAIN; | |
1766 | goto out_err; | |
1767 | } | |
1768 | ||
c3673464 KX |
1769 | if (c3cn->err) { |
1770 | c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err); | |
1648b11e KX |
1771 | err = -EPIPE; |
1772 | goto out_err; | |
1773 | } | |
1774 | ||
1775 | if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) { | |
1776 | c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n", | |
1777 | c3cn, c3cn->write_seq, c3cn->snd_una, | |
1778 | cxgb3_snd_win); | |
1393109f | 1779 | err = -ENOBUFS; |
c3673464 KX |
1780 | goto out_err; |
1781 | } | |
1782 | ||
1783 | while (skb) { | |
1784 | int frags = skb_shinfo(skb)->nr_frags + | |
1785 | (skb->len != skb->data_len); | |
1786 | ||
1787 | if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) { | |
1788 | c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn); | |
1789 | err = -EINVAL; | |
1790 | goto out_err; | |
1791 | } | |
1792 | ||
1793 | if (frags >= SKB_WR_LIST_SIZE) { | |
1794 | cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n", | |
1795 | c3cn, skb_shinfo(skb)->nr_frags, | |
1796 | skb->len, skb->data_len); | |
1797 | err = -EINVAL; | |
1798 | goto out_err; | |
1799 | } | |
1800 | ||
1801 | next = skb->next; | |
1802 | skb->next = NULL; | |
1803 | skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR); | |
1804 | copied += skb->len; | |
1805 | c3cn->write_seq += skb->len + ulp_extra_len(skb); | |
1806 | skb = next; | |
1807 | } | |
1808 | done: | |
1809 | if (likely(skb_queue_len(&c3cn->write_queue))) | |
1810 | c3cn_push_tx_frames(c3cn, 1); | |
1811 | spin_unlock_bh(&c3cn->lock); | |
1812 | return copied; | |
1813 | ||
1814 | out_err: | |
1815 | if (copied == 0 && err == -EPIPE) | |
1816 | copied = c3cn->err ? c3cn->err : -EPIPE; | |
1393109f MC |
1817 | else |
1818 | copied = err; | |
c3673464 KX |
1819 | goto done; |
1820 | } | |
1821 | ||
1822 | static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata) | |
1823 | { | |
1824 | struct adap_ports *ports = &cdata->ports; | |
2a90030f | 1825 | struct s3_conn *c3cn; |
c3673464 KX |
1826 | int i; |
1827 | ||
2a90030f KX |
1828 | for (i = 0; i < cxgb3_max_connect; i++) { |
1829 | if (cdata->sport_conn[i]) { | |
1830 | c3cn = cdata->sport_conn[i]; | |
1831 | cdata->sport_conn[i] = NULL; | |
1832 | ||
1833 | spin_lock_bh(&c3cn->lock); | |
1834 | c3cn->cdev = NULL; | |
1835 | c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN); | |
1836 | c3cn_closed(c3cn); | |
1837 | spin_unlock_bh(&c3cn->lock); | |
1838 | } | |
1839 | } | |
1840 | ||
c3673464 KX |
1841 | for (i = 0; i < ports->nports; i++) |
1842 | NDEV2CDATA(ports->lldevs[i]) = NULL; | |
2a90030f | 1843 | |
c3673464 KX |
1844 | cxgb3i_free_big_mem(cdata); |
1845 | } | |
1846 | ||
1847 | void cxgb3i_sdev_cleanup(void) | |
1848 | { | |
1849 | struct cxgb3i_sdev_data *cdata; | |
1850 | ||
1851 | write_lock(&cdata_rwlock); | |
1852 | list_for_each_entry(cdata, &cdata_list, list) { | |
1853 | list_del(&cdata->list); | |
1854 | sdev_data_cleanup(cdata); | |
1855 | } | |
1856 | write_unlock(&cdata_rwlock); | |
1857 | } | |
1858 | ||
1859 | int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers) | |
1860 | { | |
1861 | cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish; | |
1862 | cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl; | |
1863 | cpl_handlers[CPL_PEER_CLOSE] = do_peer_close; | |
1864 | cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req; | |
1865 | cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl; | |
1866 | cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl; | |
1867 | cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack; | |
1868 | cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr; | |
1869 | ||
1870 | if (cxgb3_max_connect > CXGB3I_MAX_CONN) | |
1871 | cxgb3_max_connect = CXGB3I_MAX_CONN; | |
1872 | return 0; | |
1873 | } | |
1874 | ||
1875 | /** | |
1876 | * cxgb3i_sdev_add - allocate and initialize resources for each adapter found | |
1877 | * @cdev: t3cdev adapter | |
1878 | * @client: cxgb3 driver client | |
1879 | */ | |
1880 | void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client) | |
1881 | { | |
1882 | struct cxgb3i_sdev_data *cdata; | |
1883 | struct ofld_page_info rx_page_info; | |
1884 | unsigned int wr_len; | |
2a90030f | 1885 | int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *); |
c3673464 KX |
1886 | int i; |
1887 | ||
1888 | cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL); | |
2a90030f KX |
1889 | if (!cdata) { |
1890 | cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n", | |
1891 | cdev, mapsize); | |
c3673464 | 1892 | return; |
2a90030f | 1893 | } |
c3673464 KX |
1894 | |
1895 | if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 || | |
1896 | cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 || | |
2a90030f KX |
1897 | cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) { |
1898 | cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n", | |
1899 | cdev); | |
c3673464 | 1900 | goto free_cdata; |
2a90030f | 1901 | } |
c3673464 KX |
1902 | |
1903 | s3_init_wr_tab(wr_len); | |
1904 | ||
2a90030f | 1905 | spin_lock_init(&cdata->lock); |
c3673464 KX |
1906 | INIT_LIST_HEAD(&cdata->list); |
1907 | cdata->cdev = cdev; | |
1908 | cdata->client = client; | |
1909 | ||
1910 | for (i = 0; i < cdata->ports.nports; i++) | |
1911 | NDEV2CDATA(cdata->ports.lldevs[i]) = cdata; | |
1912 | ||
1913 | write_lock(&cdata_rwlock); | |
1914 | list_add_tail(&cdata->list, &cdata_list); | |
1915 | write_unlock(&cdata_rwlock); | |
1916 | ||
2a90030f | 1917 | cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev); |
c3673464 KX |
1918 | return; |
1919 | ||
1920 | free_cdata: | |
1921 | cxgb3i_free_big_mem(cdata); | |
1922 | } | |
1923 | ||
1924 | /** | |
1925 | * cxgb3i_sdev_remove - free the allocated resources for the adapter | |
1926 | * @cdev: t3cdev adapter | |
1927 | */ | |
1928 | void cxgb3i_sdev_remove(struct t3cdev *cdev) | |
1929 | { | |
1930 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); | |
1931 | ||
2a90030f KX |
1932 | cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev); |
1933 | ||
c3673464 KX |
1934 | write_lock(&cdata_rwlock); |
1935 | list_del(&cdata->list); | |
1936 | write_unlock(&cdata_rwlock); | |
1937 | ||
1938 | sdev_data_cleanup(cdata); | |
1939 | } |