This repository has been archived by the owner on Aug 21, 2018. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2
/
t4_cpl_io.c
1838 lines (1550 loc) · 49.4 KB
/
t4_cpl_io.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*-
* Copyright (c) 2012 Chelsio Communications, Inc.
* All rights reserved.
* Written by: Navdeep Parhar <np@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#ifdef TCP_OFFLOAD
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sglist.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp_var.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/toecore.h>
#include "common/common.h"
#include "common/t4_msg.h"
#include "common/t4_regs.h"
#include "common/t4_tcb.h"
#include "tom/t4_tom_l2t.h"
#include "tom/t4_tom.h"
VNET_DECLARE(int, tcp_do_autosndbuf);
#define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
VNET_DECLARE(int, tcp_autosndbuf_inc);
#define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
VNET_DECLARE(int, tcp_autosndbuf_max);
#define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
VNET_DECLARE(int, tcp_do_autorcvbuf);
#define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
VNET_DECLARE(int, tcp_autorcvbuf_inc);
#define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc)
VNET_DECLARE(int, tcp_autorcvbuf_max);
#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
/*
* For ULP connections HW may add headers, e.g., for digests, that aren't part
* of the messages sent by the host but that are part of the TCP payload and
* therefore consume TCP sequence space. Tx connection parameters that
* operate in TCP sequence space are affected by the HW additions and need to
* compensate for them to accurately track TCP sequence numbers. This array
* contains the compensating extra lengths for ULP packets. It is indexed by
* a packet's ULP submode.
*/
const unsigned int t4_ulp_extra_len[] = {0, 4, 4, 8};
/*
* Return the length of any HW additions that will be made to a Tx packet.
* Such additions can happen for some types of ULP packets.
*/
static inline unsigned int
ulp_extra_len(struct mbuf *m, int *ulp_mode)
{
struct m_tag *mtag;
if ((mtag = m_tag_find(m, CXGBE_ISCSI_MBUF_TAG, NULL)) == NULL)
return (0);
*ulp_mode = *((int *)(mtag + 1));
return (t4_ulp_extra_len[*ulp_mode & 3]);
}
void
send_flowc_wr(struct toepcb *toep, struct flowc_tx_params *ftxp)
{
struct wrqe *wr;
struct fw_flowc_wr *flowc;
unsigned int nparams = ftxp ? 8 : 6, flowclen;
struct port_info *pi = toep->port;
struct adapter *sc = pi->adapter;
unsigned int pfvf = G_FW_VIID_PFN(pi->viid) << S_FW_VIID_PFN;
struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx];
KASSERT(!(toep->flags & TPF_FLOWC_WR_SENT),
("%s: flowc for tid %u sent already", __func__, toep->tid));
flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval);
wr = alloc_wrqe(roundup2(flowclen, 16), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
flowc = wrtod(wr);
memset(flowc, 0, wr->wr_len);
flowc->op_to_nparams = htobe32(V_FW_WR_OP(FW_FLOWC_WR) |
V_FW_FLOWC_WR_NPARAMS(nparams));
flowc->flowid_len16 = htonl(V_FW_WR_LEN16(howmany(flowclen, 16)) |
V_FW_WR_FLOWID(toep->tid));
flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
flowc->mnemval[0].val = htobe32(pfvf);
flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
flowc->mnemval[1].val = htobe32(pi->tx_chan);
flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
flowc->mnemval[2].val = htobe32(pi->tx_chan);
flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
flowc->mnemval[3].val = htobe32(toep->ofld_rxq->iq.abs_id);
if (ftxp) {
uint32_t sndbuf = min(ftxp->snd_space, sc->tt.sndbuf);
flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
flowc->mnemval[4].val = htobe32(ftxp->snd_nxt);
flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
flowc->mnemval[5].val = htobe32(ftxp->rcv_nxt);
flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
flowc->mnemval[6].val = htobe32(sndbuf);
flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
flowc->mnemval[7].val = htobe32(ftxp->mss);
CTR6(KTR_CXGBE,
"%s: tid %u, mss %u, sndbuf %u, snd_nxt 0x%x, rcv_nxt 0x%x",
__func__, toep->tid, ftxp->mss, sndbuf, ftxp->snd_nxt,
ftxp->rcv_nxt);
} else {
flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDBUF;
flowc->mnemval[4].val = htobe32(512);
flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_MSS;
flowc->mnemval[5].val = htobe32(512);
CTR2(KTR_CXGBE, "%s: tid %u", __func__, toep->tid);
}
txsd->tx_credits = howmany(flowclen, 16);
txsd->plen = 0;
KASSERT(toep->tx_credits >= txsd->tx_credits && toep->txsd_avail > 0,
("%s: not enough credits (%d)", __func__, toep->tx_credits));
toep->tx_credits -= txsd->tx_credits;
if (__predict_false(++toep->txsd_pidx == toep->txsd_total))
toep->txsd_pidx = 0;
toep->txsd_avail--;
toep->flags |= TPF_FLOWC_WR_SENT;
t4_wrq_tx(sc, wr);
}
void
send_reset(struct adapter *sc, struct toepcb *toep, uint32_t snd_nxt)
{
struct wrqe *wr;
struct cpl_abort_req *req;
int tid = toep->tid;
struct inpcb *inp = toep->inp;
struct tcpcb *tp = intotcpcb(inp); /* don't use if INP_DROPPED */
INP_WLOCK_ASSERT(inp);
CTR6(KTR_CXGBE, "%s: tid %d (%s), toep_flags 0x%x, inp_flags 0x%x%s",
__func__, toep->tid,
inp->inp_flags & INP_DROPPED ? "inp dropped" :
tcpstates[tp->t_state],
toep->flags, inp->inp_flags,
toep->flags & TPF_ABORT_SHUTDOWN ?
" (abort already in progress)" : "");
if (toep->flags & TPF_ABORT_SHUTDOWN)
return; /* abort already in progress */
toep->flags |= TPF_ABORT_SHUTDOWN;
KASSERT(toep->flags & TPF_FLOWC_WR_SENT,
("%s: flowc_wr not sent for tid %d.", __func__, tid));
wr = alloc_wrqe(sizeof(*req), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
req = wrtod(wr);
INIT_TP_WR_MIT_CPL(req, CPL_ABORT_REQ, tid);
if (inp->inp_flags & INP_DROPPED)
req->rsvd0 = htobe32(snd_nxt);
else
req->rsvd0 = htobe32(tp->snd_nxt);
req->rsvd1 = !(toep->flags & TPF_TX_DATA_SENT);
req->cmd = CPL_ABORT_SEND_RST;
/*
* XXX: What's the correct way to tell that the inp hasn't been detached
* from its socket? Should I even be flushing the snd buffer here?
*/
if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) == 0) {
struct socket *so = inp->inp_socket;
if (so != NULL) /* because I'm not sure. See comment above */
sbflush(&so->so_snd);
}
t4_l2t_send(sc, wr, toep->l2te);
}
/*
* Called when a connection is established to translate the TCP options
* reported by HW to FreeBSD's native format.
*/
static void
assign_rxopt(struct tcpcb *tp, unsigned int opt)
{
struct toepcb *toep = tp->t_toe;
struct inpcb *inp = tp->t_inpcb;
struct adapter *sc = td_adapter(toep->td);
int n;
INP_LOCK_ASSERT(inp);
if (inp->inp_inc.inc_flags & INC_ISIPV6)
n = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
else
n = sizeof(struct ip) + sizeof(struct tcphdr);
tp->t_maxseg = tp->t_maxopd = sc->params.mtus[G_TCPOPT_MSS(opt)] - n;
CTR4(KTR_CXGBE, "%s: tid %d, mtu_idx %u (%u)", __func__, toep->tid,
G_TCPOPT_MSS(opt), sc->params.mtus[G_TCPOPT_MSS(opt)]);
if (G_TCPOPT_TSTAMP(opt)) {
tp->t_flags |= TF_RCVD_TSTMP; /* timestamps ok */
tp->ts_recent = 0; /* hmmm */
tp->ts_recent_age = tcp_ts_getticks();
tp->t_maxseg -= TCPOLEN_TSTAMP_APPA;
}
if (G_TCPOPT_SACK(opt))
tp->t_flags |= TF_SACK_PERMIT; /* should already be set */
else
tp->t_flags &= ~TF_SACK_PERMIT; /* sack disallowed by peer */
if (G_TCPOPT_WSCALE_OK(opt))
tp->t_flags |= TF_RCVD_SCALE;
/* Doing window scaling? */
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
tp->snd_scale = G_TCPOPT_SND_WSCALE(opt);
}
}
/*
* Completes some final bits of initialization for just established connections
* and changes their state to TCPS_ESTABLISHED.
*
* The ISNs are from after the exchange of SYNs. i.e., the true ISN + 1.
*/
void
make_established(struct toepcb *toep, uint32_t snd_isn, uint32_t rcv_isn,
uint16_t opt)
{
struct inpcb *inp = toep->inp;
struct socket *so = inp->inp_socket;
struct tcpcb *tp = intotcpcb(inp);
long bufsize;
uint32_t iss = be32toh(snd_isn) - 1; /* true ISS */
uint32_t irs = be32toh(rcv_isn) - 1; /* true IRS */
uint16_t tcpopt = be16toh(opt);
struct flowc_tx_params ftxp;
INP_WLOCK_ASSERT(inp);
KASSERT(tp->t_state == TCPS_SYN_SENT ||
tp->t_state == TCPS_SYN_RECEIVED,
("%s: TCP state %s", __func__, tcpstates[tp->t_state]));
CTR4(KTR_CXGBE, "%s: tid %d, toep %p, inp %p",
__func__, toep->tid, toep, inp);
tp->t_state = TCPS_ESTABLISHED;
tp->t_starttime = ticks;
TCPSTAT_INC(tcps_connects);
tp->irs = irs;
tcp_rcvseqinit(tp);
tp->rcv_wnd = toep->rx_credits << 10;
tp->rcv_adv += tp->rcv_wnd;
tp->last_ack_sent = tp->rcv_nxt;
/*
* If we were unable to send all rx credits via opt0, save the remainder
* in rx_credits so that they can be handed over with the next credit
* update.
*/
SOCKBUF_LOCK(&so->so_rcv);
bufsize = select_rcv_wnd(so);
SOCKBUF_UNLOCK(&so->so_rcv);
toep->rx_credits = bufsize - tp->rcv_wnd;
tp->iss = iss;
tcp_sendseqinit(tp);
tp->snd_una = iss + 1;
tp->snd_nxt = iss + 1;
tp->snd_max = iss + 1;
assign_rxopt(tp, tcpopt);
SOCKBUF_LOCK(&so->so_snd);
if (so->so_snd.sb_flags & SB_AUTOSIZE && V_tcp_do_autosndbuf)
bufsize = V_tcp_autosndbuf_max;
else
bufsize = sbspace(&so->so_snd);
SOCKBUF_UNLOCK(&so->so_snd);
ftxp.snd_nxt = tp->snd_nxt;
ftxp.rcv_nxt = tp->rcv_nxt;
ftxp.snd_space = bufsize;
ftxp.mss = tp->t_maxseg;
send_flowc_wr(toep, &ftxp);
soisconnected(so);
}
static int
send_rx_credits(struct adapter *sc, struct toepcb *toep, int credits)
{
struct wrqe *wr;
struct cpl_rx_data_ack *req;
uint32_t dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
KASSERT(credits >= 0, ("%s: %d credits", __func__, credits));
wr = alloc_wrqe(sizeof(*req), toep->ctrlq);
if (wr == NULL)
return (0);
req = wrtod(wr);
INIT_TP_WR_MIT_CPL(req, CPL_RX_DATA_ACK, toep->tid);
req->credit_dack = htobe32(dack | V_RX_CREDITS(credits));
t4_wrq_tx(sc, wr);
return (credits);
}
void
t4_rcvd(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
struct sockbuf *sb = &so->so_rcv;
struct toepcb *toep = tp->t_toe;
int credits;
INP_WLOCK_ASSERT(inp);
SOCKBUF_LOCK(sb);
KASSERT(toep->sb_cc >= sb->sb_cc,
("%s: sb %p has more data (%d) than last time (%d).",
__func__, sb, sb->sb_cc, toep->sb_cc));
if (toep->ulp_mode == ULP_MODE_ISCSI) {
toep->rx_credits += toep->sb_cc;
toep->sb_cc = 0;
} else {
toep->rx_credits += toep->sb_cc - sb->sb_cc;
toep->sb_cc = sb->sb_cc;
}
if (toep->rx_credits > 0 &&
(tp->rcv_wnd <= 32 * 1024 || toep->rx_credits >= 64 * 1024 ||
(toep->rx_credits >= 16 * 1024 && tp->rcv_wnd <= 128 * 1024) ||
toep->sb_cc + tp->rcv_wnd < sb->sb_lowat)) {
credits = send_rx_credits(sc, toep, toep->rx_credits);
toep->rx_credits -= credits;
tp->rcv_wnd += credits;
tp->rcv_adv += credits;
}
SOCKBUF_UNLOCK(sb);
}
/*
* Close a connection by sending a CPL_CLOSE_CON_REQ message.
*/
static int
close_conn(struct adapter *sc, struct toepcb *toep)
{
struct wrqe *wr;
struct cpl_close_con_req *req;
unsigned int tid = toep->tid;
CTR3(KTR_CXGBE, "%s: tid %u%s", __func__, toep->tid,
toep->flags & TPF_FIN_SENT ? ", IGNORED" : "");
if (toep->flags & TPF_FIN_SENT)
return (0);
KASSERT(toep->flags & TPF_FLOWC_WR_SENT,
("%s: flowc_wr not sent for tid %u.", __func__, tid));
wr = alloc_wrqe(sizeof(*req), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
req = wrtod(wr);
req->wr.wr_hi = htonl(V_FW_WR_OP(FW_TP_WR) |
V_FW_WR_IMMDLEN(sizeof(*req) - sizeof(req->wr)));
req->wr.wr_mid = htonl(V_FW_WR_LEN16(howmany(sizeof(*req), 16)) |
V_FW_WR_FLOWID(tid));
req->wr.wr_lo = cpu_to_be64(0);
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
req->rsvd = 0;
toep->flags |= TPF_FIN_SENT;
toep->flags &= ~TPF_SEND_FIN;
t4_l2t_send(sc, wr, toep->l2te);
return (0);
}
#define MAX_OFLD_TX_CREDITS (SGE_MAX_WR_LEN / 16)
#define MIN_OFLD_TX_CREDITS (howmany(sizeof(struct fw_ofld_tx_data_wr) + 1, 16))
/* Maximum amount of immediate data we could stuff in a WR */
static inline int
max_imm_payload(int tx_credits)
{
const int n = 2; /* Use only up to 2 desc for imm. data WR */
KASSERT(tx_credits >= 0 &&
tx_credits <= MAX_OFLD_TX_CREDITS,
("%s: %d credits", __func__, tx_credits));
if (tx_credits < MIN_OFLD_TX_CREDITS)
return (0);
if (tx_credits >= (n * EQ_ESIZE) / 16)
return ((n * EQ_ESIZE) - sizeof(struct fw_ofld_tx_data_wr));
else
return (tx_credits * 16 - sizeof(struct fw_ofld_tx_data_wr));
}
/* Maximum number of SGL entries we could stuff in a WR */
static inline int
max_dsgl_nsegs(int tx_credits)
{
int nseg = 1; /* ulptx_sgl has room for 1, rest ulp_tx_sge_pair */
int sge_pair_credits = tx_credits - MIN_OFLD_TX_CREDITS;
KASSERT(tx_credits >= 0 &&
tx_credits <= MAX_OFLD_TX_CREDITS,
("%s: %d credits", __func__, tx_credits));
if (tx_credits < MIN_OFLD_TX_CREDITS)
return (0);
nseg += 2 * (sge_pair_credits * 16 / 24);
if ((sge_pair_credits * 16) % 24 == 16)
nseg++;
return (nseg);
}
static inline void
write_tx_wr(void *dst, struct toepcb *toep, unsigned int immdlen,
unsigned int plen, uint8_t credits, int shove, int ulp_mode, int txalign)
{
struct fw_ofld_tx_data_wr *txwr = dst;
unsigned int wr_ulp_mode;
txwr->op_to_immdlen = htobe32(V_WR_OP(FW_OFLD_TX_DATA_WR) |
V_FW_WR_IMMDLEN(immdlen));
txwr->flowid_len16 = htobe32(V_FW_WR_FLOWID(toep->tid) |
V_FW_WR_LEN16(credits));
/* for iscsi, the mode & submode setting is per-packet */
if (toep->ulp_mode == ULP_MODE_ISCSI)
wr_ulp_mode = V_TX_ULP_MODE(ulp_mode >> 4) |
V_TX_ULP_SUBMODE(ulp_mode & 3);
else
wr_ulp_mode = V_TX_ULP_MODE(toep->ulp_mode);
txwr->lsodisable_to_flags = htobe32(wr_ulp_mode | V_TX_URG(0) | /*XXX*/
V_TX_SHOVE(shove));
txwr->plen = htobe32(plen);
if (txalign > 0) {
struct tcpcb *tp = intotcpcb(toep->inp);
if (plen < 2 * tp->t_maxseg || is_10G_port(toep->port))
txwr->lsodisable_to_flags |=
htobe32(F_FW_OFLD_TX_DATA_WR_LSODISABLE);
else
txwr->lsodisable_to_flags |=
htobe32(F_FW_OFLD_TX_DATA_WR_ALIGNPLD |
(tp->t_flags & TF_NODELAY ? 0 :
F_FW_OFLD_TX_DATA_WR_ALIGNPLDSHOVE));
}
}
/*
* Generate a DSGL from a starting mbuf. The total number of segments and the
* maximum segments in any one mbuf are provided.
*/
static void
write_tx_sgl(void *dst, struct mbuf *start, struct mbuf *stop, int nsegs, int n)
{
struct mbuf *m;
struct ulptx_sgl *usgl = dst;
int i, j, rc;
struct sglist sg;
struct sglist_seg segs[n];
KASSERT(nsegs > 0, ("%s: nsegs 0", __func__));
sglist_init(&sg, n, segs);
usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
V_ULPTX_NSGE(nsegs));
i = -1;
for (m = start; m != stop; m = m->m_next) {
rc = sglist_append(&sg, mtod(m, void *), m->m_len);
if (__predict_false(rc != 0))
panic("%s: sglist_append %d", __func__, rc);
for (j = 0; j < sg.sg_nseg; i++, j++) {
if (i < 0) {
usgl->len0 = htobe32(segs[j].ss_len);
usgl->addr0 = htobe64(segs[j].ss_paddr);
} else {
usgl->sge[i / 2].len[i & 1] =
htobe32(segs[j].ss_len);
usgl->sge[i / 2].addr[i & 1] =
htobe64(segs[j].ss_paddr);
}
#ifdef INVARIANTS
nsegs--;
#endif
}
sglist_reset(&sg);
}
if (i & 1)
usgl->sge[i / 2].len[1] = htobe32(0);
KASSERT(nsegs == 0, ("%s: nsegs %d, start %p, stop %p",
__func__, nsegs, start, stop));
}
/*
* Max number of SGL entries an offload tx work request can have. This is 41
* (1 + 40) for a full 512B work request.
* fw_ofld_tx_data_wr(16B) + ulptx_sgl(16B, 1) + ulptx_sge_pair(480B, 40)
*/
#define OFLD_SGL_LEN (41)
/*
* Send data and/or a FIN to the peer.
*
* The socket's so_snd buffer consists of a stream of data starting with sb_mb
* and linked together with m_next. sb_sndptr, if set, is the last mbuf that
* was transmitted.
*
* drop indicates the number of bytes that should be dropped from the head of
* the send buffer. It is an optimization that lets do_fw4_ack avoid creating
* contention on the send buffer lock (before this change it used to do
* sowwakeup and then t4_push_frames right after that when recovering from tx
* stalls). When drop is set this function MUST drop the bytes and wake up any
* writers.
*/
void
t4_push_frames(struct adapter *sc, struct toepcb *toep, int drop)
{
struct mbuf *sndptr, *m, *sb_sndptr;
struct fw_ofld_tx_data_wr *txwr;
struct wrqe *wr;
u_int plen, nsegs, credits, max_imm, max_nsegs, max_nsegs_1mbuf;
struct inpcb *inp = toep->inp;
struct tcpcb *tp = intotcpcb(inp);
struct socket *so = inp->inp_socket;
struct sockbuf *sb = &so->so_snd;
int tx_credits, shove, compl, space, sowwakeup;
struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx];
INP_WLOCK_ASSERT(inp);
KASSERT(toep->flags & TPF_FLOWC_WR_SENT,
("%s: flowc_wr not sent for tid %u.", __func__, toep->tid));
KASSERT(toep->ulp_mode == ULP_MODE_NONE ||
toep->ulp_mode == ULP_MODE_TCPDDP ||
toep->ulp_mode == ULP_MODE_RDMA,
("%s: ulp_mode %u for toep %p", __func__, toep->ulp_mode, toep));
/*
* This function doesn't resume by itself. Someone else must clear the
* flag and call this function.
*/
if (__predict_false(toep->flags & TPF_TX_SUSPENDED)) {
KASSERT(drop == 0,
("%s: drop (%d) != 0 but tx is suspended", __func__, drop));
return;
}
do {
tx_credits = min(toep->tx_credits, MAX_OFLD_TX_CREDITS);
max_imm = max_imm_payload(tx_credits);
max_nsegs = max_dsgl_nsegs(tx_credits);
SOCKBUF_LOCK(sb);
sowwakeup = drop;
if (drop) {
sbdrop_locked(sb, drop);
drop = 0;
}
sb_sndptr = sb->sb_sndptr;
sndptr = sb_sndptr ? sb_sndptr->m_next : sb->sb_mb;
plen = 0;
nsegs = 0;
max_nsegs_1mbuf = 0; /* max # of SGL segments in any one mbuf */
for (m = sndptr; m != NULL; m = m->m_next) {
int n = sglist_count(mtod(m, void *), m->m_len);
nsegs += n;
plen += m->m_len;
/* This mbuf sent us _over_ the nsegs limit, back out */
if (plen > max_imm && nsegs > max_nsegs) {
nsegs -= n;
plen -= m->m_len;
if (plen == 0) {
/* Too few credits */
toep->flags |= TPF_TX_SUSPENDED;
if (sowwakeup)
sowwakeup_locked(so);
else
SOCKBUF_UNLOCK(sb);
SOCKBUF_UNLOCK_ASSERT(sb);
return;
}
break;
}
if (max_nsegs_1mbuf < n)
max_nsegs_1mbuf = n;
sb_sndptr = m; /* new sb->sb_sndptr if all goes well */
/* This mbuf put us right at the max_nsegs limit */
if (plen > max_imm && nsegs == max_nsegs) {
m = m->m_next;
break;
}
}
shove = m == NULL && !(tp->t_flags & TF_MORETOCOME);
space = sbspace(sb);
if (space <= sb->sb_hiwat * 3 / 8 &&
toep->plen_nocompl + plen >= sb->sb_hiwat / 4)
compl = 1;
else
compl = 0;
if (sb->sb_flags & SB_AUTOSIZE &&
V_tcp_do_autosndbuf &&
sb->sb_hiwat < V_tcp_autosndbuf_max &&
space < sb->sb_hiwat / 8) {
int newsize = min(sb->sb_hiwat + V_tcp_autosndbuf_inc,
V_tcp_autosndbuf_max);
if (!sbreserve_locked(sb, newsize, so, NULL))
sb->sb_flags &= ~SB_AUTOSIZE;
else
sowwakeup = 1; /* room available */
}
if (sowwakeup)
sowwakeup_locked(so);
else
SOCKBUF_UNLOCK(sb);
SOCKBUF_UNLOCK_ASSERT(sb);
/* nothing to send */
if (plen == 0) {
KASSERT(m == NULL,
("%s: nothing to send, but m != NULL", __func__));
break;
}
if (__predict_false(toep->flags & TPF_FIN_SENT))
panic("%s: excess tx.", __func__);
if (plen <= max_imm) {
/* Immediate data tx */
wr = alloc_wrqe(roundup2(sizeof(*txwr) + plen, 16),
toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toep->flags |= TPF_TX_SUSPENDED;
return;
}
txwr = wrtod(wr);
credits = howmany(wr->wr_len, 16);
write_tx_wr(txwr, toep, plen, plen, credits, shove, 0,
sc->tt.tx_align);
m_copydata(sndptr, 0, plen, (void *)(txwr + 1));
nsegs = 0;
} else {
int wr_len;
/* DSGL tx */
wr_len = sizeof(*txwr) + sizeof(struct ulptx_sgl) +
((3 * (nsegs - 1)) / 2 + ((nsegs - 1) & 1)) * 8;
wr = alloc_wrqe(roundup2(wr_len, 16), toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toep->flags |= TPF_TX_SUSPENDED;
return;
}
txwr = wrtod(wr);
credits = howmany(wr_len, 16);
write_tx_wr(txwr, toep, 0, plen, credits, shove, 0,
sc->tt.tx_align);
write_tx_sgl(txwr + 1, sndptr, m, nsegs,
max_nsegs_1mbuf);
if (wr_len & 0xf) {
uint64_t *pad = (uint64_t *)
((uintptr_t)txwr + wr_len);
*pad = 0;
}
}
KASSERT(toep->tx_credits >= credits,
("%s: not enough credits", __func__));
toep->tx_credits -= credits;
toep->tx_nocompl += credits;
toep->plen_nocompl += plen;
if (toep->tx_credits <= toep->tx_total * 3 / 8 &&
toep->tx_nocompl >= toep->tx_total / 4)
compl = 1;
if (compl || toep->ulp_mode == ULP_MODE_RDMA) {
txwr->op_to_immdlen |= htobe32(F_FW_WR_COMPL);
toep->tx_nocompl = 0;
toep->plen_nocompl = 0;
}
tp->snd_nxt += plen;
tp->snd_max += plen;
SOCKBUF_LOCK(sb);
KASSERT(sb_sndptr, ("%s: sb_sndptr is NULL", __func__));
sb->sb_sndptr = sb_sndptr;
SOCKBUF_UNLOCK(sb);
toep->flags |= TPF_TX_DATA_SENT;
if (toep->tx_credits < MIN_OFLD_TX_CREDITS)
toep->flags |= TPF_TX_SUSPENDED;
KASSERT(toep->txsd_avail > 0, ("%s: no txsd", __func__));
txsd->plen = plen;
txsd->tx_credits = credits;
txsd++;
if (__predict_false(++toep->txsd_pidx == toep->txsd_total)) {
toep->txsd_pidx = 0;
txsd = &toep->txsd[0];
}
toep->txsd_avail--;
t4_l2t_send(sc, wr, toep->l2te);
} while (m != NULL);
/* Send a FIN if requested, but only if there's no more data to send */
if (m == NULL && toep->flags & TPF_SEND_FIN)
close_conn(sc, toep);
}
/* Send ULP data over TOE using TX_DATA_WR. We send whole mbuf at once */
void
t4_ulp_push_frames(struct adapter *sc, struct toepcb *toep, int drop)
{
struct mbuf *sndptr, *m = NULL;
struct fw_ofld_tx_data_wr *txwr;
struct wrqe *wr;
unsigned int plen, nsegs, credits, max_imm, max_nsegs, max_nsegs_1mbuf;
struct inpcb *inp = toep->inp;
struct tcpcb *tp;
struct socket *so;
struct sockbuf *sb;
int tx_credits, ulp_len = 0, ulp_mode = 0, qlen = 0;
int shove, compl;
struct ofld_tx_sdesc *txsd;
INP_WLOCK_ASSERT(inp);
if (toep->flags & TPF_ABORT_SHUTDOWN)
return;
tp = intotcpcb(inp);
so = inp->inp_socket;
sb = &so->so_snd;
txsd = &toep->txsd[toep->txsd_pidx];
KASSERT(toep->flags & TPF_FLOWC_WR_SENT,
("%s: flowc_wr not sent for tid %u.", __func__, toep->tid));
/*
* This function doesn't resume by itself. Someone else must clear the
* flag and call this function.
*/
if (__predict_false(toep->flags & TPF_TX_SUSPENDED))
return;
sndptr = t4_queue_iscsi_callback(so, toep, 1, &qlen);
if (!qlen)
return;
do {
tx_credits = min(toep->tx_credits, MAX_OFLD_TX_CREDITS);
max_imm = max_imm_payload(tx_credits);
max_nsegs = max_dsgl_nsegs(tx_credits);
if (drop) {
t4_cpl_iscsi_callback(toep->td, toep, &drop,
CPL_FW4_ACK);
drop = 0;
}
plen = 0;
nsegs = 0;
max_nsegs_1mbuf = 0; /* max # of SGL segments in any one mbuf */
for (m = sndptr; m != NULL; m = m->m_next) {
int n = sglist_count(mtod(m, void *), m->m_len);
nsegs += n;
plen += m->m_len;
/* This mbuf sent us _over_ the nsegs limit, return */
if (plen > max_imm && nsegs > max_nsegs) {
toep->flags |= TPF_TX_SUSPENDED;
return;
}
if (max_nsegs_1mbuf < n)
max_nsegs_1mbuf = n;
/* This mbuf put us right at the max_nsegs limit */
if (plen > max_imm && nsegs == max_nsegs) {
toep->flags |= TPF_TX_SUSPENDED;
return;
}
}
shove = m == NULL && !(tp->t_flags & TF_MORETOCOME);
/* nothing to send */
if (plen == 0) {
KASSERT(m == NULL,
("%s: nothing to send, but m != NULL", __func__));
break;
}
if (__predict_false(toep->flags & TPF_FIN_SENT))
panic("%s: excess tx.", __func__);
ulp_len = plen + ulp_extra_len(sndptr, &ulp_mode);
if (plen <= max_imm) {
/* Immediate data tx */
wr = alloc_wrqe(roundup(sizeof(*txwr) + plen, 16),
toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toep->flags |= TPF_TX_SUSPENDED;
return;
}
txwr = wrtod(wr);
credits = howmany(wr->wr_len, 16);
write_tx_wr(txwr, toep, plen, ulp_len, credits, shove,
ulp_mode, 0);
m_copydata(sndptr, 0, plen, (void *)(txwr + 1));
} else {
int wr_len;
/* DSGL tx */
wr_len = sizeof(*txwr) + sizeof(struct ulptx_sgl) +
((3 * (nsegs - 1)) / 2 + ((nsegs - 1) & 1)) * 8;
wr = alloc_wrqe(roundup(wr_len, 16), toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toep->flags |= TPF_TX_SUSPENDED;
return;
}
txwr = wrtod(wr);
credits = howmany(wr_len, 16);
write_tx_wr(txwr, toep, 0, ulp_len, credits, shove,
ulp_mode, 0);
write_tx_sgl(txwr + 1, sndptr, m, nsegs,
max_nsegs_1mbuf);
if (wr_len & 0xf) {
uint64_t *pad = (uint64_t *)
((uintptr_t)txwr + wr_len);
*pad = 0;
}
}
KASSERT(toep->tx_credits >= credits,
("%s: not enough credits", __func__));
toep->tx_credits -= credits;
toep->tx_nocompl += credits;
toep->plen_nocompl += plen;
if (toep->tx_credits <= toep->tx_total * 3 / 8 &&
toep->tx_nocompl >= toep->tx_total / 4)
compl = 1;
if (compl) {
txwr->op_to_immdlen |= htobe32(F_FW_WR_COMPL);
toep->tx_nocompl = 0;
toep->plen_nocompl = 0;
}
tp->snd_nxt += ulp_len;
tp->snd_max += ulp_len;
/* goto next mbuf */
sndptr = m = t4_queue_iscsi_callback(so, toep, 2, &qlen);
toep->flags |= TPF_TX_DATA_SENT;
if (toep->tx_credits < MIN_OFLD_TX_CREDITS) {
toep->flags |= TPF_TX_SUSPENDED;
}
KASSERT(toep->txsd_avail > 0, ("%s: no txsd", __func__));
txsd->plen = plen;
txsd->tx_credits = credits;
txsd++;
if (__predict_false(++toep->txsd_pidx == toep->txsd_total)) {
toep->txsd_pidx = 0;
txsd = &toep->txsd[0];
}
toep->txsd_avail--;
t4_l2t_send(sc, wr, toep->l2te);
} while (m != NULL);
/* Send a FIN if requested, but only if there's no more data to send */
if (m == NULL && toep->flags & TPF_SEND_FIN)
close_conn(sc, toep);
}
int
t4_tod_output(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
#ifdef INVARIANTS
struct inpcb *inp = tp->t_inpcb;
#endif
struct toepcb *toep = tp->t_toe;
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & INP_DROPPED) == 0,
("%s: inp %p dropped.", __func__, inp));
KASSERT(toep != NULL, ("%s: toep is NULL", __func__));
t4_push_frames(sc, toep, 0);
return (0);
}
int
t4_send_fin(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
#ifdef INVARIANTS
struct inpcb *inp = tp->t_inpcb;
#endif