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