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[FreeBSD/stable/10.git] / sys / dev / cxgbe / t4_netmap.c
1 /*-
2  * Copyright (c) 2014 Chelsio Communications, Inc.
3  * All rights reserved.
4  * Written by: Navdeep Parhar <np@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #ifdef DEV_NETMAP
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/eventhandler.h>
38 #include <sys/lock.h>
39 #include <sys/mbuf.h>
40 #include <sys/module.h>
41 #include <sys/selinfo.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
44 #include <machine/bus.h>
45 #include <net/ethernet.h>
46 #include <net/if.h>
47 #include <net/if_media.h>
48 #include <net/if_var.h>
49 #include <net/if_clone.h>
50 #include <net/if_types.h>
51 #include <net/netmap.h>
52 #include <dev/netmap/netmap_kern.h>
53
54 #include "common/common.h"
55 #include "common/t4_regs.h"
56 #include "common/t4_regs_values.h"
57
58 extern int fl_pad;      /* XXXNM */
59
60 SYSCTL_NODE(_hw, OID_AUTO, cxgbe, CTLFLAG_RD, 0, "cxgbe netmap parameters");
61
62 /*
63  * 0 = normal netmap rx
64  * 1 = black hole
65  * 2 = supermassive black hole (buffer packing enabled)
66  */
67 int black_hole = 0;
68 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_black_hole, CTLFLAG_RDTUN, &black_hole, 0,
69     "Sink incoming packets.");
70
71 int rx_ndesc = 256;
72 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_rx_ndesc, CTLFLAG_RWTUN,
73     &rx_ndesc, 0, "# of rx descriptors after which the hw cidx is updated.");
74
75 int holdoff_tmr_idx = 2;
76 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_holdoff_tmr_idx, CTLFLAG_RWTUN,
77     &holdoff_tmr_idx, 0, "Holdoff timer index for netmap rx queues.");
78
79 /*
80  * Congestion drops.
81  * -1: no congestion feedback (not recommended).
82  *  0: backpressure the channel instead of dropping packets right away.
83  *  1: no backpressure, drop packets for the congested queue immediately.
84  */
85 static int nm_cong_drop = 1;
86 TUNABLE_INT("hw.cxgbe.nm_cong_drop", &nm_cong_drop);
87
88 static int
89 alloc_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq, int cong)
90 {
91         int rc, cntxt_id, i;
92         __be32 v;
93         struct adapter *sc = vi->pi->adapter;
94         struct sge_params *sp = &sc->params.sge;
95         struct netmap_adapter *na = NA(vi->ifp);
96         struct fw_iq_cmd c;
97
98         MPASS(na != NULL);
99         MPASS(nm_rxq->iq_desc != NULL);
100         MPASS(nm_rxq->fl_desc != NULL);
101
102         bzero(nm_rxq->iq_desc, vi->qsize_rxq * IQ_ESIZE);
103         bzero(nm_rxq->fl_desc, na->num_rx_desc * EQ_ESIZE + sp->spg_len);
104
105         bzero(&c, sizeof(c));
106         c.op_to_vfn = htobe32(V_FW_CMD_OP(FW_IQ_CMD) | F_FW_CMD_REQUEST |
107             F_FW_CMD_WRITE | F_FW_CMD_EXEC | V_FW_IQ_CMD_PFN(sc->pf) |
108             V_FW_IQ_CMD_VFN(0));
109         c.alloc_to_len16 = htobe32(F_FW_IQ_CMD_ALLOC | F_FW_IQ_CMD_IQSTART |
110             FW_LEN16(c));
111         if (vi->flags & INTR_RXQ) {
112                 KASSERT(nm_rxq->intr_idx < sc->intr_count,
113                     ("%s: invalid direct intr_idx %d", __func__,
114                     nm_rxq->intr_idx));
115                 v = V_FW_IQ_CMD_IQANDSTINDEX(nm_rxq->intr_idx);
116         } else {
117                 CXGBE_UNIMPLEMENTED(__func__);  /* XXXNM: needs review */
118                 v = V_FW_IQ_CMD_IQANDSTINDEX(nm_rxq->intr_idx) |
119                     F_FW_IQ_CMD_IQANDST;
120         }
121         c.type_to_iqandstindex = htobe32(v |
122             V_FW_IQ_CMD_TYPE(FW_IQ_TYPE_FL_INT_CAP) |
123             V_FW_IQ_CMD_VIID(vi->viid) |
124             V_FW_IQ_CMD_IQANUD(X_UPDATEDELIVERY_INTERRUPT));
125         c.iqdroprss_to_iqesize = htobe16(V_FW_IQ_CMD_IQPCIECH(vi->pi->tx_chan) |
126             F_FW_IQ_CMD_IQGTSMODE |
127             V_FW_IQ_CMD_IQINTCNTTHRESH(0) |
128             V_FW_IQ_CMD_IQESIZE(ilog2(IQ_ESIZE) - 4));
129         c.iqsize = htobe16(vi->qsize_rxq);
130         c.iqaddr = htobe64(nm_rxq->iq_ba);
131         if (cong >= 0) {
132                 c.iqns_to_fl0congen = htobe32(F_FW_IQ_CMD_IQFLINTCONGEN |
133                     V_FW_IQ_CMD_FL0CNGCHMAP(cong) | F_FW_IQ_CMD_FL0CONGCIF |
134                     F_FW_IQ_CMD_FL0CONGEN);
135         }
136         c.iqns_to_fl0congen |=
137             htobe32(V_FW_IQ_CMD_FL0HOSTFCMODE(X_HOSTFCMODE_NONE) |
138                 F_FW_IQ_CMD_FL0FETCHRO | F_FW_IQ_CMD_FL0DATARO |
139                 (fl_pad ? F_FW_IQ_CMD_FL0PADEN : 0) |
140                 (black_hole == 2 ? F_FW_IQ_CMD_FL0PACKEN : 0));
141         c.fl0dcaen_to_fl0cidxfthresh =
142             htobe16(V_FW_IQ_CMD_FL0FBMIN(X_FETCHBURSTMIN_128B) |
143                 V_FW_IQ_CMD_FL0FBMAX(X_FETCHBURSTMAX_512B));
144         c.fl0size = htobe16(na->num_rx_desc / 8 + sp->spg_len / EQ_ESIZE);
145         c.fl0addr = htobe64(nm_rxq->fl_ba);
146
147         rc = -t4_wr_mbox(sc, sc->mbox, &c, sizeof(c), &c);
148         if (rc != 0) {
149                 device_printf(sc->dev,
150                     "failed to create netmap ingress queue: %d\n", rc);
151                 return (rc);
152         }
153
154         nm_rxq->iq_cidx = 0;
155         MPASS(nm_rxq->iq_sidx == vi->qsize_rxq - sp->spg_len / IQ_ESIZE);
156         nm_rxq->iq_gen = F_RSPD_GEN;
157         nm_rxq->iq_cntxt_id = be16toh(c.iqid);
158         nm_rxq->iq_abs_id = be16toh(c.physiqid);
159         cntxt_id = nm_rxq->iq_cntxt_id - sc->sge.iq_start;
160         if (cntxt_id >= sc->sge.niq) {
161                 panic ("%s: nm_rxq->iq_cntxt_id (%d) more than the max (%d)",
162                     __func__, cntxt_id, sc->sge.niq - 1);
163         }
164         sc->sge.iqmap[cntxt_id] = (void *)nm_rxq;
165
166         nm_rxq->fl_cntxt_id = be16toh(c.fl0id);
167         nm_rxq->fl_pidx = nm_rxq->fl_cidx = 0;
168         MPASS(nm_rxq->fl_sidx == na->num_rx_desc);
169         cntxt_id = nm_rxq->fl_cntxt_id - sc->sge.eq_start;
170         if (cntxt_id >= sc->sge.neq) {
171                 panic("%s: nm_rxq->fl_cntxt_id (%d) more than the max (%d)",
172                     __func__, cntxt_id, sc->sge.neq - 1);
173         }
174         sc->sge.eqmap[cntxt_id] = (void *)nm_rxq;
175
176         nm_rxq->fl_db_val = V_QID(nm_rxq->fl_cntxt_id) |
177             sc->chip_params->sge_fl_db;
178
179         if (is_t5(sc) && cong >= 0) {
180                 uint32_t param, val;
181
182                 param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) |
183                     V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DMAQ_CONM_CTXT) |
184                     V_FW_PARAMS_PARAM_YZ(nm_rxq->iq_cntxt_id);
185                 param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) |
186                     V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DMAQ_CONM_CTXT) |
187                     V_FW_PARAMS_PARAM_YZ(nm_rxq->iq_cntxt_id);
188                 if (cong == 0)
189                         val = 1 << 19;
190                 else {
191                         val = 2 << 19;
192                         for (i = 0; i < 4; i++) {
193                                 if (cong & (1 << i))
194                                         val |= 1 << (i << 2);
195                         }
196                 }
197
198                 rc = -t4_set_params(sc, sc->mbox, sc->pf, 0, 1, &param, &val);
199                 if (rc != 0) {
200                         /* report error but carry on */
201                         device_printf(sc->dev,
202                             "failed to set congestion manager context for "
203                             "ingress queue %d: %d\n", nm_rxq->iq_cntxt_id, rc);
204                 }
205         }
206
207         t4_write_reg(sc, MYPF_REG(A_SGE_PF_GTS),
208             V_INGRESSQID(nm_rxq->iq_cntxt_id) |
209             V_SEINTARM(V_QINTR_TIMER_IDX(holdoff_tmr_idx)));
210
211         return (rc);
212 }
213
214 static int
215 free_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq)
216 {
217         struct adapter *sc = vi->pi->adapter;
218         int rc;
219
220         rc = -t4_iq_free(sc, sc->mbox, sc->pf, 0, FW_IQ_TYPE_FL_INT_CAP,
221             nm_rxq->iq_cntxt_id, nm_rxq->fl_cntxt_id, 0xffff);
222         if (rc != 0)
223                 device_printf(sc->dev, "%s: failed for iq %d, fl %d: %d\n",
224                     __func__, nm_rxq->iq_cntxt_id, nm_rxq->fl_cntxt_id, rc);
225         return (rc);
226 }
227
228 static int
229 alloc_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq)
230 {
231         int rc, cntxt_id;
232         size_t len;
233         struct adapter *sc = vi->pi->adapter;
234         struct netmap_adapter *na = NA(vi->ifp);
235         struct fw_eq_eth_cmd c;
236
237         MPASS(na != NULL);
238         MPASS(nm_txq->desc != NULL);
239
240         len = na->num_tx_desc * EQ_ESIZE + sc->params.sge.spg_len;
241         bzero(nm_txq->desc, len);
242
243         bzero(&c, sizeof(c));
244         c.op_to_vfn = htobe32(V_FW_CMD_OP(FW_EQ_ETH_CMD) | F_FW_CMD_REQUEST |
245             F_FW_CMD_WRITE | F_FW_CMD_EXEC | V_FW_EQ_ETH_CMD_PFN(sc->pf) |
246             V_FW_EQ_ETH_CMD_VFN(0));
247         c.alloc_to_len16 = htobe32(F_FW_EQ_ETH_CMD_ALLOC |
248             F_FW_EQ_ETH_CMD_EQSTART | FW_LEN16(c));
249         c.autoequiqe_to_viid = htobe32(F_FW_EQ_ETH_CMD_AUTOEQUIQE |
250             F_FW_EQ_ETH_CMD_AUTOEQUEQE | V_FW_EQ_ETH_CMD_VIID(vi->viid));
251         c.fetchszm_to_iqid =
252             htobe32(V_FW_EQ_ETH_CMD_HOSTFCMODE(X_HOSTFCMODE_NONE) |
253                 V_FW_EQ_ETH_CMD_PCIECHN(vi->pi->tx_chan) | F_FW_EQ_ETH_CMD_FETCHRO |
254                 V_FW_EQ_ETH_CMD_IQID(sc->sge.nm_rxq[nm_txq->iqidx].iq_cntxt_id));
255         c.dcaen_to_eqsize = htobe32(V_FW_EQ_ETH_CMD_FBMIN(X_FETCHBURSTMIN_64B) |
256                       V_FW_EQ_ETH_CMD_FBMAX(X_FETCHBURSTMAX_512B) |
257                       V_FW_EQ_ETH_CMD_EQSIZE(len / EQ_ESIZE));
258         c.eqaddr = htobe64(nm_txq->ba);
259
260         rc = -t4_wr_mbox(sc, sc->mbox, &c, sizeof(c), &c);
261         if (rc != 0) {
262                 device_printf(vi->dev,
263                     "failed to create netmap egress queue: %d\n", rc);
264                 return (rc);
265         }
266
267         nm_txq->cntxt_id = G_FW_EQ_ETH_CMD_EQID(be32toh(c.eqid_pkd));
268         cntxt_id = nm_txq->cntxt_id - sc->sge.eq_start;
269         if (cntxt_id >= sc->sge.neq)
270             panic("%s: nm_txq->cntxt_id (%d) more than the max (%d)", __func__,
271                 cntxt_id, sc->sge.neq - 1);
272         sc->sge.eqmap[cntxt_id] = (void *)nm_txq;
273
274         nm_txq->pidx = nm_txq->cidx = 0;
275         MPASS(nm_txq->sidx == na->num_tx_desc);
276         nm_txq->equiqidx = nm_txq->equeqidx = nm_txq->dbidx = 0;
277
278         nm_txq->doorbells = sc->doorbells;
279         if (isset(&nm_txq->doorbells, DOORBELL_UDB) ||
280             isset(&nm_txq->doorbells, DOORBELL_UDBWC) ||
281             isset(&nm_txq->doorbells, DOORBELL_WCWR)) {
282                 uint32_t s_qpp = sc->params.sge.eq_s_qpp;
283                 uint32_t mask = (1 << s_qpp) - 1;
284                 volatile uint8_t *udb;
285
286                 udb = sc->udbs_base + UDBS_DB_OFFSET;
287                 udb += (nm_txq->cntxt_id >> s_qpp) << PAGE_SHIFT;
288                 nm_txq->udb_qid = nm_txq->cntxt_id & mask;
289                 if (nm_txq->udb_qid >= PAGE_SIZE / UDBS_SEG_SIZE)
290                         clrbit(&nm_txq->doorbells, DOORBELL_WCWR);
291                 else {
292                         udb += nm_txq->udb_qid << UDBS_SEG_SHIFT;
293                         nm_txq->udb_qid = 0;
294                 }
295                 nm_txq->udb = (volatile void *)udb;
296         }
297
298         return (rc);
299 }
300
301 static int
302 free_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq)
303 {
304         struct adapter *sc = vi->pi->adapter;
305         int rc;
306
307         rc = -t4_eth_eq_free(sc, sc->mbox, sc->pf, 0, nm_txq->cntxt_id);
308         if (rc != 0)
309                 device_printf(sc->dev, "%s: failed for eq %d: %d\n", __func__,
310                     nm_txq->cntxt_id, rc);
311         return (rc);
312 }
313
314 static int
315 cxgbe_netmap_on(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
316     struct netmap_adapter *na)
317 {
318         struct netmap_slot *slot;
319         struct sge_nm_rxq *nm_rxq;
320         struct sge_nm_txq *nm_txq;
321         int rc, i, j, hwidx;
322         struct hw_buf_info *hwb;
323
324         ASSERT_SYNCHRONIZED_OP(sc);
325
326         if ((vi->flags & VI_INIT_DONE) == 0 ||
327             (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
328                 return (EAGAIN);
329
330         hwb = &sc->sge.hw_buf_info[0];
331         for (i = 0; i < SGE_FLBUF_SIZES; i++, hwb++) {
332                 if (hwb->size == NETMAP_BUF_SIZE(na))
333                         break;
334         }
335         if (i >= SGE_FLBUF_SIZES) {
336                 if_printf(ifp, "no hwidx for netmap buffer size %d.\n",
337                     NETMAP_BUF_SIZE(na));
338                 return (ENXIO);
339         }
340         hwidx = i;
341
342         /* Must set caps before calling netmap_reset */
343         nm_set_native_flags(na);
344
345         for_each_nm_rxq(vi, i, nm_rxq) {
346                 struct irq *irq = &sc->irq[vi->first_intr + i];
347
348                 alloc_nm_rxq_hwq(vi, nm_rxq, tnl_cong(vi->pi, nm_cong_drop));
349                 nm_rxq->fl_hwidx = hwidx;
350                 slot = netmap_reset(na, NR_RX, i, 0);
351                 MPASS(slot != NULL);    /* XXXNM: error check, not assert */
352
353                 /* We deal with 8 bufs at a time */
354                 MPASS((na->num_rx_desc & 7) == 0);
355                 MPASS(na->num_rx_desc == nm_rxq->fl_sidx);
356                 for (j = 0; j < nm_rxq->fl_sidx; j++) {
357                         uint64_t ba;
358
359                         PNMB(na, &slot[j], &ba);
360                         MPASS(ba != 0);
361                         nm_rxq->fl_desc[j] = htobe64(ba | hwidx);
362                 }
363                 j = nm_rxq->fl_pidx = nm_rxq->fl_sidx - 8;
364                 MPASS((j & 7) == 0);
365                 j /= 8; /* driver pidx to hardware pidx */
366                 wmb();
367                 t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
368                     nm_rxq->fl_db_val | V_PIDX(j));
369
370                 atomic_cmpset_int(&irq->nm_state, NM_OFF, NM_ON);
371         }
372
373         for_each_nm_txq(vi, i, nm_txq) {
374                 alloc_nm_txq_hwq(vi, nm_txq);
375                 slot = netmap_reset(na, NR_TX, i, 0);
376                 MPASS(slot != NULL);    /* XXXNM: error check, not assert */
377         }
378
379         if (vi->nm_rss == NULL) {
380                 vi->nm_rss = malloc(vi->rss_size * sizeof(uint16_t), M_CXGBE,
381                     M_ZERO | M_WAITOK);
382         }
383         for (i = 0; i < vi->rss_size;) {
384                 for_each_nm_rxq(vi, j, nm_rxq) {
385                         vi->nm_rss[i++] = nm_rxq->iq_abs_id;
386                         if (i == vi->rss_size)
387                                 break;
388                 }
389         }
390         rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
391             vi->nm_rss, vi->rss_size);
392         if (rc != 0)
393                 if_printf(ifp, "netmap rss_config failed: %d\n", rc);
394
395         return (rc);
396 }
397
398 static int
399 cxgbe_netmap_off(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
400     struct netmap_adapter *na)
401 {
402         int rc, i;
403         struct sge_nm_txq *nm_txq;
404         struct sge_nm_rxq *nm_rxq;
405
406         ASSERT_SYNCHRONIZED_OP(sc);
407
408         if ((vi->flags & VI_INIT_DONE) == 0)
409                 return (0);
410
411         rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
412             vi->rss, vi->rss_size);
413         if (rc != 0)
414                 if_printf(ifp, "failed to restore RSS config: %d\n", rc);
415         nm_clear_native_flags(na);
416
417         for_each_nm_txq(vi, i, nm_txq) {
418                 struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
419
420                 /* Wait for hw pidx to catch up ... */
421                 while (be16toh(nm_txq->pidx) != spg->pidx)
422                         pause("nmpidx", 1);
423
424                 /* ... and then for the cidx. */
425                 while (spg->pidx != spg->cidx)
426                         pause("nmcidx", 1);
427
428                 free_nm_txq_hwq(vi, nm_txq);
429         }
430         for_each_nm_rxq(vi, i, nm_rxq) {
431                 struct irq *irq = &sc->irq[vi->first_intr + i];
432
433                 while (!atomic_cmpset_int(&irq->nm_state, NM_ON, NM_OFF))
434                         pause("nmst", 1);
435
436                 free_nm_rxq_hwq(vi, nm_rxq);
437         }
438
439         return (rc);
440 }
441
442 static int
443 cxgbe_netmap_reg(struct netmap_adapter *na, int on)
444 {
445         struct ifnet *ifp = na->ifp;
446         struct vi_info *vi = ifp->if_softc;
447         struct adapter *sc = vi->pi->adapter;
448         int rc;
449
450         rc = begin_synchronized_op(sc, vi, SLEEP_OK | INTR_OK, "t4nmreg");
451         if (rc != 0)
452                 return (rc);
453         if (on)
454                 rc = cxgbe_netmap_on(sc, vi, ifp, na);
455         else
456                 rc = cxgbe_netmap_off(sc, vi, ifp, na);
457         end_synchronized_op(sc, 0);
458
459         return (rc);
460 }
461
462 /* How many packets can a single type1 WR carry in n descriptors */
463 static inline int
464 ndesc_to_npkt(const int n)
465 {
466
467         MPASS(n > 0 && n <= SGE_MAX_WR_NDESC);
468
469         return (n * 2 - 1);
470 }
471 #define MAX_NPKT_IN_TYPE1_WR    (ndesc_to_npkt(SGE_MAX_WR_NDESC))
472
473 /* Space (in descriptors) needed for a type1 WR that carries n packets */
474 static inline int
475 npkt_to_ndesc(const int n)
476 {
477
478         MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
479
480         return ((n + 2) / 2);
481 }
482
483 /* Space (in 16B units) needed for a type1 WR that carries n packets */
484 static inline int
485 npkt_to_len16(const int n)
486 {
487
488         MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
489
490         return (n * 2 + 1);
491 }
492
493 #define NMIDXDIFF(q, idx) IDXDIFF((q)->pidx, (q)->idx, (q)->sidx)
494
495 static void
496 ring_nm_txq_db(struct adapter *sc, struct sge_nm_txq *nm_txq)
497 {
498         int n;
499         u_int db = nm_txq->doorbells;
500
501         MPASS(nm_txq->pidx != nm_txq->dbidx);
502
503         n = NMIDXDIFF(nm_txq, dbidx);
504         if (n > 1)
505                 clrbit(&db, DOORBELL_WCWR);
506         wmb();
507
508         switch (ffs(db) - 1) {
509         case DOORBELL_UDB:
510                 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
511                 break;
512
513         case DOORBELL_WCWR: {
514                 volatile uint64_t *dst, *src;
515
516                 /*
517                  * Queues whose 128B doorbell segment fits in the page do not
518                  * use relative qid (udb_qid is always 0).  Only queues with
519                  * doorbell segments can do WCWR.
520                  */
521                 KASSERT(nm_txq->udb_qid == 0 && n == 1,
522                     ("%s: inappropriate doorbell (0x%x, %d, %d) for nm_txq %p",
523                     __func__, nm_txq->doorbells, n, nm_txq->pidx, nm_txq));
524
525                 dst = (volatile void *)((uintptr_t)nm_txq->udb +
526                     UDBS_WR_OFFSET - UDBS_DB_OFFSET);
527                 src = (void *)&nm_txq->desc[nm_txq->dbidx];
528                 while (src != (void *)&nm_txq->desc[nm_txq->dbidx + 1])
529                         *dst++ = *src++;
530                 wmb();
531                 break;
532         }
533
534         case DOORBELL_UDBWC:
535                 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
536                 wmb();
537                 break;
538
539         case DOORBELL_KDB:
540                 t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
541                     V_QID(nm_txq->cntxt_id) | V_PIDX(n));
542                 break;
543         }
544         nm_txq->dbidx = nm_txq->pidx;
545 }
546
547 int lazy_tx_credit_flush = 1;
548
549 /*
550  * Write work requests to send 'npkt' frames and ring the doorbell to send them
551  * on their way.  No need to check for wraparound.
552  */
553 static void
554 cxgbe_nm_tx(struct adapter *sc, struct sge_nm_txq *nm_txq,
555     struct netmap_kring *kring, int npkt, int npkt_remaining, int txcsum)
556 {
557         struct netmap_ring *ring = kring->ring;
558         struct netmap_slot *slot;
559         const u_int lim = kring->nkr_num_slots - 1;
560         struct fw_eth_tx_pkts_wr *wr = (void *)&nm_txq->desc[nm_txq->pidx];
561         uint16_t len;
562         uint64_t ba;
563         struct cpl_tx_pkt_core *cpl;
564         struct ulptx_sgl *usgl;
565         int i, n;
566
567         while (npkt) {
568                 n = min(npkt, MAX_NPKT_IN_TYPE1_WR);
569                 len = 0;
570
571                 wr = (void *)&nm_txq->desc[nm_txq->pidx];
572                 wr->op_pkd = htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS_WR));
573                 wr->equiq_to_len16 = htobe32(V_FW_WR_LEN16(npkt_to_len16(n)));
574                 wr->npkt = n;
575                 wr->r3 = 0;
576                 wr->type = 1;
577                 cpl = (void *)(wr + 1);
578
579                 for (i = 0; i < n; i++) {
580                         slot = &ring->slot[kring->nr_hwcur];
581                         PNMB(kring->na, slot, &ba);
582                         MPASS(ba != 0);
583
584                         cpl->ctrl0 = nm_txq->cpl_ctrl0;
585                         cpl->pack = 0;
586                         cpl->len = htobe16(slot->len);
587                         /*
588                          * netmap(4) says "netmap does not use features such as
589                          * checksum offloading, TCP segmentation offloading,
590                          * encryption, VLAN encapsulation/decapsulation, etc."
591                          *
592                          * So the ncxl interfaces have tx hardware checksumming
593                          * disabled by default.  But you can override netmap by
594                          * enabling IFCAP_TXCSUM on the interface manully.
595                          */
596                         cpl->ctrl1 = txcsum ? 0 :
597                             htobe64(F_TXPKT_IPCSUM_DIS | F_TXPKT_L4CSUM_DIS);
598
599                         usgl = (void *)(cpl + 1);
600                         usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
601                             V_ULPTX_NSGE(1));
602                         usgl->len0 = htobe32(slot->len);
603                         usgl->addr0 = htobe64(ba);
604
605                         slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
606                         cpl = (void *)(usgl + 1);
607                         MPASS(slot->len + len <= UINT16_MAX);
608                         len += slot->len;
609                         kring->nr_hwcur = nm_next(kring->nr_hwcur, lim);
610                 }
611                 wr->plen = htobe16(len);
612
613                 npkt -= n;
614                 nm_txq->pidx += npkt_to_ndesc(n);
615                 MPASS(nm_txq->pidx <= nm_txq->sidx);
616                 if (__predict_false(nm_txq->pidx == nm_txq->sidx)) {
617                         /*
618                          * This routine doesn't know how to write WRs that wrap
619                          * around.  Make sure it wasn't asked to.
620                          */
621                         MPASS(npkt == 0);
622                         nm_txq->pidx = 0;
623                 }
624
625                 if (npkt == 0 && npkt_remaining == 0) {
626                         /* All done. */
627                         if (lazy_tx_credit_flush == 0) {
628                                 wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
629                                     F_FW_WR_EQUIQ);
630                                 nm_txq->equeqidx = nm_txq->pidx;
631                                 nm_txq->equiqidx = nm_txq->pidx;
632                         }
633                         ring_nm_txq_db(sc, nm_txq);
634                         return;
635                 }
636
637                 if (NMIDXDIFF(nm_txq, equiqidx) >= nm_txq->sidx / 2) {
638                         wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
639                             F_FW_WR_EQUIQ);
640                         nm_txq->equeqidx = nm_txq->pidx;
641                         nm_txq->equiqidx = nm_txq->pidx;
642                 } else if (NMIDXDIFF(nm_txq, equeqidx) >= 64) {
643                         wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ);
644                         nm_txq->equeqidx = nm_txq->pidx;
645                 }
646                 if (NMIDXDIFF(nm_txq, dbidx) >= 2 * SGE_MAX_WR_NDESC)
647                         ring_nm_txq_db(sc, nm_txq);
648         }
649
650         /* Will get called again. */
651         MPASS(npkt_remaining);
652 }
653
654 /* How many contiguous free descriptors starting at pidx */
655 static inline int
656 contiguous_ndesc_available(struct sge_nm_txq *nm_txq)
657 {
658
659         if (nm_txq->cidx > nm_txq->pidx)
660                 return (nm_txq->cidx - nm_txq->pidx - 1);
661         else if (nm_txq->cidx > 0)
662                 return (nm_txq->sidx - nm_txq->pidx);
663         else
664                 return (nm_txq->sidx - nm_txq->pidx - 1);
665 }
666
667 static int
668 reclaim_nm_tx_desc(struct sge_nm_txq *nm_txq)
669 {
670         struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
671         uint16_t hw_cidx = spg->cidx;   /* snapshot */
672         struct fw_eth_tx_pkts_wr *wr;
673         int n = 0;
674
675         hw_cidx = be16toh(hw_cidx);
676
677         while (nm_txq->cidx != hw_cidx) {
678                 wr = (void *)&nm_txq->desc[nm_txq->cidx];
679
680                 MPASS(wr->op_pkd == htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS_WR)));
681                 MPASS(wr->type == 1);
682                 MPASS(wr->npkt > 0 && wr->npkt <= MAX_NPKT_IN_TYPE1_WR);
683
684                 n += wr->npkt;
685                 nm_txq->cidx += npkt_to_ndesc(wr->npkt);
686
687                 /*
688                  * We never sent a WR that wrapped around so the credits coming
689                  * back, WR by WR, should never cause the cidx to wrap around
690                  * either.
691                  */
692                 MPASS(nm_txq->cidx <= nm_txq->sidx);
693                 if (__predict_false(nm_txq->cidx == nm_txq->sidx))
694                         nm_txq->cidx = 0;
695         }
696
697         return (n);
698 }
699
700 static int
701 cxgbe_netmap_txsync(struct netmap_kring *kring, int flags)
702 {
703         struct netmap_adapter *na = kring->na;
704         struct ifnet *ifp = na->ifp;
705         struct vi_info *vi = ifp->if_softc;
706         struct adapter *sc = vi->pi->adapter;
707         struct sge_nm_txq *nm_txq = &sc->sge.nm_txq[vi->first_nm_txq + kring->ring_id];
708         const u_int head = kring->rhead;
709         u_int reclaimed = 0;
710         int n, d, npkt_remaining, ndesc_remaining, txcsum;
711
712         /*
713          * Tx was at kring->nr_hwcur last time around and now we need to advance
714          * to kring->rhead.  Note that the driver's pidx moves independent of
715          * netmap's kring->nr_hwcur (pidx counts descriptors and the relation
716          * between descriptors and frames isn't 1:1).
717          */
718
719         npkt_remaining = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
720             kring->nkr_num_slots - kring->nr_hwcur + head;
721         txcsum = ifp->if_capenable & (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6);
722         while (npkt_remaining) {
723                 reclaimed += reclaim_nm_tx_desc(nm_txq);
724                 ndesc_remaining = contiguous_ndesc_available(nm_txq);
725                 /* Can't run out of descriptors with packets still remaining */
726                 MPASS(ndesc_remaining > 0);
727
728                 /* # of desc needed to tx all remaining packets */
729                 d = (npkt_remaining / MAX_NPKT_IN_TYPE1_WR) * SGE_MAX_WR_NDESC;
730                 if (npkt_remaining % MAX_NPKT_IN_TYPE1_WR)
731                         d += npkt_to_ndesc(npkt_remaining % MAX_NPKT_IN_TYPE1_WR);
732
733                 if (d <= ndesc_remaining)
734                         n = npkt_remaining;
735                 else {
736                         /* Can't send all, calculate how many can be sent */
737                         n = (ndesc_remaining / SGE_MAX_WR_NDESC) *
738                             MAX_NPKT_IN_TYPE1_WR;
739                         if (ndesc_remaining % SGE_MAX_WR_NDESC)
740                                 n += ndesc_to_npkt(ndesc_remaining % SGE_MAX_WR_NDESC);
741                 }
742
743                 /* Send n packets and update nm_txq->pidx and kring->nr_hwcur */
744                 npkt_remaining -= n;
745                 cxgbe_nm_tx(sc, nm_txq, kring, n, npkt_remaining, txcsum);
746         }
747         MPASS(npkt_remaining == 0);
748         MPASS(kring->nr_hwcur == head);
749         MPASS(nm_txq->dbidx == nm_txq->pidx);
750
751         /*
752          * Second part: reclaim buffers for completed transmissions.
753          */
754         if (reclaimed || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
755                 reclaimed += reclaim_nm_tx_desc(nm_txq);
756                 kring->nr_hwtail += reclaimed;
757                 if (kring->nr_hwtail >= kring->nkr_num_slots)
758                         kring->nr_hwtail -= kring->nkr_num_slots;
759         }
760
761         nm_txsync_finalize(kring);
762
763         return (0);
764 }
765
766 static int
767 cxgbe_netmap_rxsync(struct netmap_kring *kring, int flags)
768 {
769         struct netmap_adapter *na = kring->na;
770         struct netmap_ring *ring = kring->ring;
771         struct ifnet *ifp = na->ifp;
772         struct vi_info *vi = ifp->if_softc;
773         struct adapter *sc = vi->pi->adapter;
774         struct sge_nm_rxq *nm_rxq = &sc->sge.nm_rxq[vi->first_nm_rxq + kring->ring_id];
775         u_int const head = nm_rxsync_prologue(kring);
776         u_int n;
777         int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
778
779         if (black_hole)
780                 return (0);     /* No updates ever. */
781
782         if (netmap_no_pendintr || force_update) {
783                 kring->nr_hwtail = atomic_load_acq_32(&nm_rxq->fl_cidx);
784                 kring->nr_kflags &= ~NKR_PENDINTR;
785         }
786
787         /* Userspace done with buffers from kring->nr_hwcur to head */
788         n = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
789             kring->nkr_num_slots - kring->nr_hwcur + head;
790         n &= ~7U;
791         if (n > 0) {
792                 u_int fl_pidx = nm_rxq->fl_pidx;
793                 struct netmap_slot *slot = &ring->slot[fl_pidx];
794                 uint64_t ba;
795                 int i, dbinc = 0, hwidx = nm_rxq->fl_hwidx;
796
797                 /*
798                  * We always deal with 8 buffers at a time.  We must have
799                  * stopped at an 8B boundary (fl_pidx) last time around and we
800                  * must have a multiple of 8B buffers to give to the freelist.
801                  */
802                 MPASS((fl_pidx & 7) == 0);
803                 MPASS((n & 7) == 0);
804
805                 IDXINCR(kring->nr_hwcur, n, kring->nkr_num_slots);
806                 IDXINCR(nm_rxq->fl_pidx, n, nm_rxq->fl_sidx);
807
808                 while (n > 0) {
809                         for (i = 0; i < 8; i++, fl_pidx++, slot++) {
810                                 PNMB(na, slot, &ba);
811                                 MPASS(ba != 0);
812                                 nm_rxq->fl_desc[fl_pidx] = htobe64(ba | hwidx);
813                                 slot->flags &= ~NS_BUF_CHANGED;
814                                 MPASS(fl_pidx <= nm_rxq->fl_sidx);
815                         }
816                         n -= 8;
817                         if (fl_pidx == nm_rxq->fl_sidx) {
818                                 fl_pidx = 0;
819                                 slot = &ring->slot[0];
820                         }
821                         if (++dbinc == 8 && n >= 32) {
822                                 wmb();
823                                 t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
824                                     nm_rxq->fl_db_val | V_PIDX(dbinc));
825                                 dbinc = 0;
826                         }
827                 }
828                 MPASS(nm_rxq->fl_pidx == fl_pidx);
829
830                 if (dbinc > 0) {
831                         wmb();
832                         t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
833                             nm_rxq->fl_db_val | V_PIDX(dbinc));
834                 }
835         }
836
837         nm_rxsync_finalize(kring);
838
839         return (0);
840 }
841
842 void
843 cxgbe_nm_attach(struct vi_info *vi)
844 {
845         struct port_info *pi;
846         struct adapter *sc;
847         struct netmap_adapter na;
848
849         MPASS(vi->nnmrxq > 0);
850         MPASS(vi->ifp != NULL);
851
852         pi = vi->pi;
853         sc = pi->adapter;
854
855         bzero(&na, sizeof(na));
856
857         na.ifp = vi->ifp;
858         na.na_flags = NAF_BDG_MAYSLEEP;
859
860         /* Netmap doesn't know about the space reserved for the status page. */
861         na.num_tx_desc = vi->qsize_txq - sc->params.sge.spg_len / EQ_ESIZE;
862
863         /*
864          * The freelist's cidx/pidx drives netmap's rx cidx/pidx.  So
865          * num_rx_desc is based on the number of buffers that can be held in the
866          * freelist, and not the number of entries in the iq.  (These two are
867          * not exactly the same due to the space taken up by the status page).
868          */
869         na.num_rx_desc = (vi->qsize_rxq / 8) * 8;
870         na.nm_txsync = cxgbe_netmap_txsync;
871         na.nm_rxsync = cxgbe_netmap_rxsync;
872         na.nm_register = cxgbe_netmap_reg;
873         na.num_tx_rings = vi->nnmtxq;
874         na.num_rx_rings = vi->nnmrxq;
875         netmap_attach(&na);     /* This adds IFCAP_NETMAP to if_capabilities */
876 }
877
878 void
879 cxgbe_nm_detach(struct vi_info *vi)
880 {
881
882         MPASS(vi->nnmrxq > 0);
883         MPASS(vi->ifp != NULL);
884
885         netmap_detach(vi->ifp);
886 }
887
888 static void
889 handle_nm_fw6_msg(struct adapter *sc, struct ifnet *ifp,
890     const struct cpl_fw6_msg *cpl)
891 {
892         const struct cpl_sge_egr_update *egr;
893         uint32_t oq;
894         struct sge_nm_txq *nm_txq;
895
896         if (cpl->type != FW_TYPE_RSSCPL && cpl->type != FW6_TYPE_RSSCPL)
897                 panic("%s: FW_TYPE 0x%x on nm_rxq.", __func__, cpl->type);
898
899         /* data[0] is RSS header */
900         egr = (const void *)&cpl->data[1];
901         oq = be32toh(egr->opcode_qid);
902         MPASS(G_CPL_OPCODE(oq) == CPL_SGE_EGR_UPDATE);
903         nm_txq = (void *)sc->sge.eqmap[G_EGR_QID(oq) - sc->sge.eq_start];
904
905         netmap_tx_irq(ifp, nm_txq->nid);
906 }
907
908 void
909 t4_nm_intr(void *arg)
910 {
911         struct sge_nm_rxq *nm_rxq = arg;
912         struct vi_info *vi = nm_rxq->vi;
913         struct adapter *sc = vi->pi->adapter;
914         struct ifnet *ifp = vi->ifp;
915         struct netmap_adapter *na = NA(ifp);
916         struct netmap_kring *kring = &na->rx_rings[nm_rxq->nid];
917         struct netmap_ring *ring = kring->ring;
918         struct iq_desc *d = &nm_rxq->iq_desc[nm_rxq->iq_cidx];
919         uint32_t lq;
920         u_int n = 0, work = 0;
921         uint8_t opcode;
922         uint32_t fl_cidx = atomic_load_acq_32(&nm_rxq->fl_cidx);
923         u_int fl_credits = fl_cidx & 7;
924
925         while ((d->rsp.u.type_gen & F_RSPD_GEN) == nm_rxq->iq_gen) {
926
927                 rmb();
928
929                 lq = be32toh(d->rsp.pldbuflen_qid);
930                 opcode = d->rss.opcode;
931
932                 switch (G_RSPD_TYPE(d->rsp.u.type_gen)) {
933                 case X_RSPD_TYPE_FLBUF:
934                         if (black_hole != 2) {
935                                 /* No buffer packing so new buf every time */
936                                 MPASS(lq & F_RSPD_NEWBUF);
937                         }
938
939                         /* fall through */
940
941                 case X_RSPD_TYPE_CPL:
942                         MPASS(opcode < NUM_CPL_CMDS);
943
944                         switch (opcode) {
945                         case CPL_FW4_MSG:
946                         case CPL_FW6_MSG:
947                                 handle_nm_fw6_msg(sc, ifp,
948                                     (const void *)&d->cpl[0]);
949                                 break;
950                         case CPL_RX_PKT:
951                                 ring->slot[fl_cidx].len = G_RSPD_LEN(lq) -
952                                     sc->params.sge.fl_pktshift;
953                                 ring->slot[fl_cidx].flags = kring->nkr_slot_flags;
954                                 fl_cidx += (lq & F_RSPD_NEWBUF) ? 1 : 0;
955                                 fl_credits += (lq & F_RSPD_NEWBUF) ? 1 : 0;
956                                 if (__predict_false(fl_cidx == nm_rxq->fl_sidx))
957                                         fl_cidx = 0;
958                                 break;
959                         default:
960                                 panic("%s: unexpected opcode 0x%x on nm_rxq %p",
961                                     __func__, opcode, nm_rxq);
962                         }
963                         break;
964
965                 case X_RSPD_TYPE_INTR:
966                         /* Not equipped to handle forwarded interrupts. */
967                         panic("%s: netmap queue received interrupt for iq %u\n",
968                             __func__, lq);
969
970                 default:
971                         panic("%s: illegal response type %d on nm_rxq %p",
972                             __func__, G_RSPD_TYPE(d->rsp.u.type_gen), nm_rxq);
973                 }
974
975                 d++;
976                 if (__predict_false(++nm_rxq->iq_cidx == nm_rxq->iq_sidx)) {
977                         nm_rxq->iq_cidx = 0;
978                         d = &nm_rxq->iq_desc[0];
979                         nm_rxq->iq_gen ^= F_RSPD_GEN;
980                 }
981
982                 if (__predict_false(++n == rx_ndesc)) {
983                         atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
984                         if (black_hole && fl_credits >= 8) {
985                                 fl_credits /= 8;
986                                 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8,
987                                     nm_rxq->fl_sidx);
988                                 t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
989                                     nm_rxq->fl_db_val | V_PIDX(fl_credits));
990                                 fl_credits = fl_cidx & 7;
991                         } else if (!black_hole) {
992                                 netmap_rx_irq(ifp, nm_rxq->nid, &work);
993                                 MPASS(work != 0);
994                         }
995                         t4_write_reg(sc, MYPF_REG(A_SGE_PF_GTS),
996                             V_CIDXINC(n) | V_INGRESSQID(nm_rxq->iq_cntxt_id) |
997                             V_SEINTARM(V_QINTR_TIMER_IDX(X_TIMERREG_UPDATE_CIDX)));
998                         n = 0;
999                 }
1000         }
1001
1002         atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
1003         if (black_hole) {
1004                 fl_credits /= 8;
1005                 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8, nm_rxq->fl_sidx);
1006                 t4_write_reg(sc, MYPF_REG(A_SGE_PF_KDOORBELL),
1007                     nm_rxq->fl_db_val | V_PIDX(fl_credits));
1008         } else
1009                 netmap_rx_irq(ifp, nm_rxq->nid, &work);
1010
1011         t4_write_reg(sc, MYPF_REG(A_SGE_PF_GTS), V_CIDXINC(n) |
1012             V_INGRESSQID((u32)nm_rxq->iq_cntxt_id) |
1013             V_SEINTARM(V_QINTR_TIMER_IDX(holdoff_tmr_idx)));
1014 }
1015 #endif