1 /*-
2 * Copyright (c) 2014 Chelsio Communications, Inc.
3 * All rights reserved.
4 * Written by: Navdeep Parhar <[email protected]>
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 /*
61 * 0 = normal netmap rx
62 * 1 = black hole
63 * 2 = supermassive black hole (buffer packing enabled)
64 */
65 int black_hole = 0;
66 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_black_hole, CTLFLAG_RDTUN, &black_hole, 0,
67 "Sink incoming packets.");
68
69 int rx_ndesc = 256;
70 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_rx_ndesc, CTLFLAG_RWTUN,
71 &rx_ndesc, 0, "# of rx descriptors after which the hw cidx is updated.");
72
73 int rx_nframes = 64;
74 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_rx_nframes, CTLFLAG_RWTUN,
75 &rx_nframes, 0, "max # of frames received before waking up netmap rx.");
76
77 int holdoff_tmr_idx = 2;
78 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_holdoff_tmr_idx, CTLFLAG_RWTUN,
79 &holdoff_tmr_idx, 0, "Holdoff timer index for netmap rx queues.");
80
81 /*
82 * Congestion drops.
83 * -1: no congestion feedback (not recommended).
84 * 0: backpressure the channel instead of dropping packets right away.
85 * 1: no backpressure, drop packets for the congested queue immediately.
86 */
87 static int nm_cong_drop = 1;
88 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_cong_drop, CTLFLAG_RDTUN,
89 &nm_cong_drop, 0,
90 "Congestion control for netmap rx queues (0 = backpressure, 1 = drop");
91
92 int starve_fl = 0;
93 SYSCTL_INT(_hw_cxgbe, OID_AUTO, starve_fl, CTLFLAG_RWTUN,
94 &starve_fl, 0, "Don't ring fl db for netmap rx queues.");
95
96 /*
97 * Try to process tx credits in bulk. This may cause a delay in the return of
98 * tx credits and is suitable for bursty or non-stop tx only.
99 */
100 int lazy_tx_credit_flush = 1;
101 SYSCTL_INT(_hw_cxgbe, OID_AUTO, lazy_tx_credit_flush, CTLFLAG_RWTUN,
102 &lazy_tx_credit_flush, 0, "lazy credit flush for netmap tx queues.");
103
104 /*
105 * Split the netmap rx queues into two groups that populate separate halves of
106 * the RSS indirection table. This allows filters with hashmask to steer to a
107 * particular group of queues.
108 */
109 static int nm_split_rss = 0;
110 SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_split_rss, CTLFLAG_RWTUN,
111 &nm_split_rss, 0, "Split the netmap rx queues into two groups.");
112
113 static int
alloc_nm_rxq_hwq(struct vi_info * vi,struct sge_nm_rxq * nm_rxq,int cong)114 alloc_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq, int cong)
115 {
116 int rc, cntxt_id, i;
117 __be32 v;
118 struct adapter *sc = vi->pi->adapter;
119 struct sge_params *sp = &sc->params.sge;
120 struct netmap_adapter *na = NA(vi->ifp);
121 struct fw_iq_cmd c;
122
123 MPASS(na != NULL);
124 MPASS(nm_rxq->iq_desc != NULL);
125 MPASS(nm_rxq->fl_desc != NULL);
126
127 bzero(nm_rxq->iq_desc, vi->qsize_rxq * IQ_ESIZE);
128 bzero(nm_rxq->fl_desc, na->num_rx_desc * EQ_ESIZE + sp->spg_len);
129
130 bzero(&c, sizeof(c));
131 c.op_to_vfn = htobe32(V_FW_CMD_OP(FW_IQ_CMD) | F_FW_CMD_REQUEST |
132 F_FW_CMD_WRITE | F_FW_CMD_EXEC | V_FW_IQ_CMD_PFN(sc->pf) |
133 V_FW_IQ_CMD_VFN(0));
134 c.alloc_to_len16 = htobe32(F_FW_IQ_CMD_ALLOC | F_FW_IQ_CMD_IQSTART |
135 FW_LEN16(c));
136 MPASS(!forwarding_intr_to_fwq(sc));
137 KASSERT(nm_rxq->intr_idx < sc->intr_count,
138 ("%s: invalid direct intr_idx %d", __func__, nm_rxq->intr_idx));
139 v = V_FW_IQ_CMD_IQANDSTINDEX(nm_rxq->intr_idx);
140 c.type_to_iqandstindex = htobe32(v |
141 V_FW_IQ_CMD_TYPE(FW_IQ_TYPE_FL_INT_CAP) |
142 V_FW_IQ_CMD_VIID(vi->viid) |
143 V_FW_IQ_CMD_IQANUD(X_UPDATEDELIVERY_INTERRUPT));
144 c.iqdroprss_to_iqesize = htobe16(V_FW_IQ_CMD_IQPCIECH(vi->pi->tx_chan) |
145 F_FW_IQ_CMD_IQGTSMODE |
146 V_FW_IQ_CMD_IQINTCNTTHRESH(0) |
147 V_FW_IQ_CMD_IQESIZE(ilog2(IQ_ESIZE) - 4));
148 c.iqsize = htobe16(vi->qsize_rxq);
149 c.iqaddr = htobe64(nm_rxq->iq_ba);
150 if (cong >= 0) {
151 c.iqns_to_fl0congen = htobe32(F_FW_IQ_CMD_IQFLINTCONGEN |
152 V_FW_IQ_CMD_FL0CNGCHMAP(cong) | F_FW_IQ_CMD_FL0CONGCIF |
153 F_FW_IQ_CMD_FL0CONGEN);
154 }
155 c.iqns_to_fl0congen |=
156 htobe32(V_FW_IQ_CMD_FL0HOSTFCMODE(X_HOSTFCMODE_NONE) |
157 F_FW_IQ_CMD_FL0FETCHRO | F_FW_IQ_CMD_FL0DATARO |
158 (fl_pad ? F_FW_IQ_CMD_FL0PADEN : 0) |
159 (black_hole == 2 ? F_FW_IQ_CMD_FL0PACKEN : 0));
160 c.fl0dcaen_to_fl0cidxfthresh =
161 htobe16(V_FW_IQ_CMD_FL0FBMIN(chip_id(sc) <= CHELSIO_T5 ?
162 X_FETCHBURSTMIN_128B : X_FETCHBURSTMIN_64B) |
163 V_FW_IQ_CMD_FL0FBMAX(chip_id(sc) <= CHELSIO_T5 ?
164 X_FETCHBURSTMAX_512B : X_FETCHBURSTMAX_256B));
165 c.fl0size = htobe16(na->num_rx_desc / 8 + sp->spg_len / EQ_ESIZE);
166 c.fl0addr = htobe64(nm_rxq->fl_ba);
167
168 rc = -t4_wr_mbox(sc, sc->mbox, &c, sizeof(c), &c);
169 if (rc != 0) {
170 device_printf(sc->dev,
171 "failed to create netmap ingress queue: %d\n", rc);
172 return (rc);
173 }
174
175 nm_rxq->iq_cidx = 0;
176 MPASS(nm_rxq->iq_sidx == vi->qsize_rxq - sp->spg_len / IQ_ESIZE);
177 nm_rxq->iq_gen = F_RSPD_GEN;
178 nm_rxq->iq_cntxt_id = be16toh(c.iqid);
179 nm_rxq->iq_abs_id = be16toh(c.physiqid);
180 cntxt_id = nm_rxq->iq_cntxt_id - sc->sge.iq_start;
181 if (cntxt_id >= sc->sge.niq) {
182 panic ("%s: nm_rxq->iq_cntxt_id (%d) more than the max (%d)",
183 __func__, cntxt_id, sc->sge.niq - 1);
184 }
185 sc->sge.iqmap[cntxt_id] = (void *)nm_rxq;
186
187 nm_rxq->fl_cntxt_id = be16toh(c.fl0id);
188 nm_rxq->fl_pidx = nm_rxq->fl_cidx = 0;
189 MPASS(nm_rxq->fl_sidx == na->num_rx_desc);
190 cntxt_id = nm_rxq->fl_cntxt_id - sc->sge.eq_start;
191 if (cntxt_id >= sc->sge.neq) {
192 panic("%s: nm_rxq->fl_cntxt_id (%d) more than the max (%d)",
193 __func__, cntxt_id, sc->sge.neq - 1);
194 }
195 sc->sge.eqmap[cntxt_id] = (void *)nm_rxq;
196
197 nm_rxq->fl_db_val = V_QID(nm_rxq->fl_cntxt_id) |
198 sc->chip_params->sge_fl_db;
199
200 if (chip_id(sc) >= CHELSIO_T5 && cong >= 0) {
201 uint32_t param, val;
202
203 param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) |
204 V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DMAQ_CONM_CTXT) |
205 V_FW_PARAMS_PARAM_YZ(nm_rxq->iq_cntxt_id);
206 param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) |
207 V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DMAQ_CONM_CTXT) |
208 V_FW_PARAMS_PARAM_YZ(nm_rxq->iq_cntxt_id);
209 if (cong == 0)
210 val = 1 << 19;
211 else {
212 val = 2 << 19;
213 for (i = 0; i < 4; i++) {
214 if (cong & (1 << i))
215 val |= 1 << (i << 2);
216 }
217 }
218
219 rc = -t4_set_params(sc, sc->mbox, sc->pf, 0, 1, ¶m, &val);
220 if (rc != 0) {
221 /* report error but carry on */
222 device_printf(sc->dev,
223 "failed to set congestion manager context for "
224 "ingress queue %d: %d\n", nm_rxq->iq_cntxt_id, rc);
225 }
226 }
227
228 t4_write_reg(sc, sc->sge_gts_reg,
229 V_INGRESSQID(nm_rxq->iq_cntxt_id) |
230 V_SEINTARM(V_QINTR_TIMER_IDX(holdoff_tmr_idx)));
231
232 return (rc);
233 }
234
235 static int
free_nm_rxq_hwq(struct vi_info * vi,struct sge_nm_rxq * nm_rxq)236 free_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq)
237 {
238 struct adapter *sc = vi->pi->adapter;
239 int rc;
240
241 rc = -t4_iq_free(sc, sc->mbox, sc->pf, 0, FW_IQ_TYPE_FL_INT_CAP,
242 nm_rxq->iq_cntxt_id, nm_rxq->fl_cntxt_id, 0xffff);
243 if (rc != 0)
244 device_printf(sc->dev, "%s: failed for iq %d, fl %d: %d\n",
245 __func__, nm_rxq->iq_cntxt_id, nm_rxq->fl_cntxt_id, rc);
246 nm_rxq->iq_cntxt_id = INVALID_NM_RXQ_CNTXT_ID;
247 return (rc);
248 }
249
250 static int
alloc_nm_txq_hwq(struct vi_info * vi,struct sge_nm_txq * nm_txq)251 alloc_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq)
252 {
253 int rc, cntxt_id;
254 size_t len;
255 struct adapter *sc = vi->pi->adapter;
256 struct netmap_adapter *na = NA(vi->ifp);
257 struct fw_eq_eth_cmd c;
258
259 MPASS(na != NULL);
260 MPASS(nm_txq->desc != NULL);
261
262 len = na->num_tx_desc * EQ_ESIZE + sc->params.sge.spg_len;
263 bzero(nm_txq->desc, len);
264
265 bzero(&c, sizeof(c));
266 c.op_to_vfn = htobe32(V_FW_CMD_OP(FW_EQ_ETH_CMD) | F_FW_CMD_REQUEST |
267 F_FW_CMD_WRITE | F_FW_CMD_EXEC | V_FW_EQ_ETH_CMD_PFN(sc->pf) |
268 V_FW_EQ_ETH_CMD_VFN(0));
269 c.alloc_to_len16 = htobe32(F_FW_EQ_ETH_CMD_ALLOC |
270 F_FW_EQ_ETH_CMD_EQSTART | FW_LEN16(c));
271 c.autoequiqe_to_viid = htobe32(F_FW_EQ_ETH_CMD_AUTOEQUIQE |
272 F_FW_EQ_ETH_CMD_AUTOEQUEQE | V_FW_EQ_ETH_CMD_VIID(vi->viid));
273 c.fetchszm_to_iqid =
274 htobe32(V_FW_EQ_ETH_CMD_HOSTFCMODE(X_HOSTFCMODE_NONE) |
275 V_FW_EQ_ETH_CMD_PCIECHN(vi->pi->tx_chan) | F_FW_EQ_ETH_CMD_FETCHRO |
276 V_FW_EQ_ETH_CMD_IQID(sc->sge.nm_rxq[nm_txq->iqidx].iq_cntxt_id));
277 c.dcaen_to_eqsize = htobe32(V_FW_EQ_ETH_CMD_FBMIN(X_FETCHBURSTMIN_64B) |
278 V_FW_EQ_ETH_CMD_FBMAX(X_FETCHBURSTMAX_512B) |
279 V_FW_EQ_ETH_CMD_EQSIZE(len / EQ_ESIZE));
280 c.eqaddr = htobe64(nm_txq->ba);
281
282 rc = -t4_wr_mbox(sc, sc->mbox, &c, sizeof(c), &c);
283 if (rc != 0) {
284 device_printf(vi->dev,
285 "failed to create netmap egress queue: %d\n", rc);
286 return (rc);
287 }
288
289 nm_txq->cntxt_id = G_FW_EQ_ETH_CMD_EQID(be32toh(c.eqid_pkd));
290 cntxt_id = nm_txq->cntxt_id - sc->sge.eq_start;
291 if (cntxt_id >= sc->sge.neq)
292 panic("%s: nm_txq->cntxt_id (%d) more than the max (%d)", __func__,
293 cntxt_id, sc->sge.neq - 1);
294 sc->sge.eqmap[cntxt_id] = (void *)nm_txq;
295
296 nm_txq->pidx = nm_txq->cidx = 0;
297 MPASS(nm_txq->sidx == na->num_tx_desc);
298 nm_txq->equiqidx = nm_txq->equeqidx = nm_txq->dbidx = 0;
299
300 nm_txq->doorbells = sc->doorbells;
301 if (isset(&nm_txq->doorbells, DOORBELL_UDB) ||
302 isset(&nm_txq->doorbells, DOORBELL_UDBWC) ||
303 isset(&nm_txq->doorbells, DOORBELL_WCWR)) {
304 uint32_t s_qpp = sc->params.sge.eq_s_qpp;
305 uint32_t mask = (1 << s_qpp) - 1;
306 volatile uint8_t *udb;
307
308 udb = sc->udbs_base + UDBS_DB_OFFSET;
309 udb += (nm_txq->cntxt_id >> s_qpp) << PAGE_SHIFT;
310 nm_txq->udb_qid = nm_txq->cntxt_id & mask;
311 if (nm_txq->udb_qid >= PAGE_SIZE / UDBS_SEG_SIZE)
312 clrbit(&nm_txq->doorbells, DOORBELL_WCWR);
313 else {
314 udb += nm_txq->udb_qid << UDBS_SEG_SHIFT;
315 nm_txq->udb_qid = 0;
316 }
317 nm_txq->udb = (volatile void *)udb;
318 }
319
320 return (rc);
321 }
322
323 static int
free_nm_txq_hwq(struct vi_info * vi,struct sge_nm_txq * nm_txq)324 free_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq)
325 {
326 struct adapter *sc = vi->pi->adapter;
327 int rc;
328
329 rc = -t4_eth_eq_free(sc, sc->mbox, sc->pf, 0, nm_txq->cntxt_id);
330 if (rc != 0)
331 device_printf(sc->dev, "%s: failed for eq %d: %d\n", __func__,
332 nm_txq->cntxt_id, rc);
333 nm_txq->cntxt_id = INVALID_NM_TXQ_CNTXT_ID;
334 return (rc);
335 }
336
337 static int
cxgbe_netmap_on(struct adapter * sc,struct vi_info * vi,struct ifnet * ifp,struct netmap_adapter * na)338 cxgbe_netmap_on(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
339 struct netmap_adapter *na)
340 {
341 struct netmap_slot *slot;
342 struct netmap_kring *kring;
343 struct sge_nm_rxq *nm_rxq;
344 struct sge_nm_txq *nm_txq;
345 int rc, i, j, hwidx, defq, nrssq;
346 struct hw_buf_info *hwb;
347
348 ASSERT_SYNCHRONIZED_OP(sc);
349
350 if ((vi->flags & VI_INIT_DONE) == 0 ||
351 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
352 return (EAGAIN);
353
354 hwb = &sc->sge.hw_buf_info[0];
355 for (i = 0; i < SGE_FLBUF_SIZES; i++, hwb++) {
356 if (hwb->size == NETMAP_BUF_SIZE(na))
357 break;
358 }
359 if (i >= SGE_FLBUF_SIZES) {
360 if_printf(ifp, "no hwidx for netmap buffer size %d.\n",
361 NETMAP_BUF_SIZE(na));
362 return (ENXIO);
363 }
364 hwidx = i;
365
366 /* Must set caps before calling netmap_reset */
367 nm_set_native_flags(na);
368
369 for_each_nm_rxq(vi, i, nm_rxq) {
370 kring = na->rx_rings[nm_rxq->nid];
371 if (!nm_kring_pending_on(kring) ||
372 nm_rxq->iq_cntxt_id != INVALID_NM_RXQ_CNTXT_ID)
373 continue;
374
375 alloc_nm_rxq_hwq(vi, nm_rxq, tnl_cong(vi->pi, nm_cong_drop));
376 nm_rxq->fl_hwidx = hwidx;
377 slot = netmap_reset(na, NR_RX, i, 0);
378 MPASS(slot != NULL); /* XXXNM: error check, not assert */
379
380 /* We deal with 8 bufs at a time */
381 MPASS((na->num_rx_desc & 7) == 0);
382 MPASS(na->num_rx_desc == nm_rxq->fl_sidx);
383 for (j = 0; j < nm_rxq->fl_sidx; j++) {
384 uint64_t ba;
385
386 PNMB(na, &slot[j], &ba);
387 MPASS(ba != 0);
388 nm_rxq->fl_desc[j] = htobe64(ba | hwidx);
389 }
390 j = nm_rxq->fl_pidx = nm_rxq->fl_sidx - 8;
391 MPASS((j & 7) == 0);
392 j /= 8; /* driver pidx to hardware pidx */
393 wmb();
394 t4_write_reg(sc, sc->sge_kdoorbell_reg,
395 nm_rxq->fl_db_val | V_PIDX(j));
396
397 (void) atomic_cmpset_int(&nm_rxq->nm_state, NM_OFF, NM_ON);
398 }
399
400 for_each_nm_txq(vi, i, nm_txq) {
401 kring = na->tx_rings[nm_txq->nid];
402 if (!nm_kring_pending_on(kring) ||
403 nm_txq->cntxt_id != INVALID_NM_TXQ_CNTXT_ID)
404 continue;
405
406 alloc_nm_txq_hwq(vi, nm_txq);
407 slot = netmap_reset(na, NR_TX, i, 0);
408 MPASS(slot != NULL); /* XXXNM: error check, not assert */
409 }
410
411 if (vi->nm_rss == NULL) {
412 vi->nm_rss = malloc(vi->rss_size * sizeof(uint16_t), M_CXGBE,
413 M_ZERO | M_WAITOK);
414 }
415
416 MPASS(vi->nnmrxq > 0);
417 if (nm_split_rss == 0 || vi->nnmrxq == 1) {
418 for (i = 0; i < vi->rss_size;) {
419 for_each_nm_rxq(vi, j, nm_rxq) {
420 vi->nm_rss[i++] = nm_rxq->iq_abs_id;
421 if (i == vi->rss_size)
422 break;
423 }
424 }
425 defq = vi->nm_rss[0];
426 } else {
427 /* We have multiple queues and we want to split the table. */
428 MPASS(nm_split_rss != 0);
429 MPASS(vi->nnmrxq > 1);
430
431 nm_rxq = &sc->sge.nm_rxq[vi->first_nm_rxq];
432 nrssq = vi->nnmrxq;
433 if (vi->nnmrxq & 1) {
434 /*
435 * Odd number of queues. The first rxq is designated the
436 * default queue, the rest are split evenly.
437 */
438 defq = nm_rxq->iq_abs_id;
439 nm_rxq++;
440 nrssq--;
441 } else {
442 /*
443 * Even number of queues split into two halves. The
444 * first rxq in one of the halves is designated the
445 * default queue.
446 */
447 #if 1
448 /* First rxq in the first half. */
449 defq = nm_rxq->iq_abs_id;
450 #else
451 /* First rxq in the second half. */
452 defq = nm_rxq[vi->nnmrxq / 2].iq_abs_id;
453 #endif
454 }
455
456 i = 0;
457 while (i < vi->rss_size / 2) {
458 for (j = 0; j < nrssq / 2; j++) {
459 vi->nm_rss[i++] = nm_rxq[j].iq_abs_id;
460 if (i == vi->rss_size / 2)
461 break;
462 }
463 }
464 while (i < vi->rss_size) {
465 for (j = nrssq / 2; j < nrssq; j++) {
466 vi->nm_rss[i++] = nm_rxq[j].iq_abs_id;
467 if (i == vi->rss_size)
468 break;
469 }
470 }
471 }
472 rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
473 vi->nm_rss, vi->rss_size);
474 if (rc != 0)
475 if_printf(ifp, "netmap rss_config failed: %d\n", rc);
476
477 rc = -t4_config_vi_rss(sc, sc->mbox, vi->viid, vi->hashen, defq, 0, 0);
478 if (rc != 0)
479 if_printf(ifp, "netmap rss hash/defaultq config failed: %d\n", rc);
480
481 return (rc);
482 }
483
484 static int
cxgbe_netmap_off(struct adapter * sc,struct vi_info * vi,struct ifnet * ifp,struct netmap_adapter * na)485 cxgbe_netmap_off(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
486 struct netmap_adapter *na)
487 {
488 struct netmap_kring *kring;
489 int rc, i;
490 struct sge_nm_txq *nm_txq;
491 struct sge_nm_rxq *nm_rxq;
492
493 ASSERT_SYNCHRONIZED_OP(sc);
494
495 if (!nm_netmap_on(na))
496 return (0);
497
498 if ((vi->flags & VI_INIT_DONE) == 0)
499 return (0);
500
501 rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
502 vi->rss, vi->rss_size);
503 if (rc != 0)
504 if_printf(ifp, "failed to restore RSS config: %d\n", rc);
505 rc = -t4_config_vi_rss(sc, sc->mbox, vi->viid, vi->hashen, vi->rss[0], 0, 0);
506 if (rc != 0)
507 if_printf(ifp, "failed to restore RSS hash/defaultq: %d\n", rc);
508 nm_clear_native_flags(na);
509
510 for_each_nm_txq(vi, i, nm_txq) {
511 struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
512
513 kring = na->tx_rings[nm_txq->nid];
514 if (!nm_kring_pending_off(kring) ||
515 nm_txq->cntxt_id == INVALID_NM_TXQ_CNTXT_ID)
516 continue;
517
518 /* Wait for hw pidx to catch up ... */
519 while (be16toh(nm_txq->pidx) != spg->pidx)
520 pause("nmpidx", 1);
521
522 /* ... and then for the cidx. */
523 while (spg->pidx != spg->cidx)
524 pause("nmcidx", 1);
525
526 free_nm_txq_hwq(vi, nm_txq);
527 }
528 for_each_nm_rxq(vi, i, nm_rxq) {
529 kring = na->rx_rings[nm_rxq->nid];
530 if (!nm_kring_pending_off(kring) ||
531 nm_rxq->iq_cntxt_id == INVALID_NM_RXQ_CNTXT_ID)
532 continue;
533
534 while (!atomic_cmpset_int(&nm_rxq->nm_state, NM_ON, NM_OFF))
535 pause("nmst", 1);
536
537 free_nm_rxq_hwq(vi, nm_rxq);
538 }
539
540 return (rc);
541 }
542
543 static int
cxgbe_netmap_reg(struct netmap_adapter * na,int on)544 cxgbe_netmap_reg(struct netmap_adapter *na, int on)
545 {
546 struct ifnet *ifp = na->ifp;
547 struct vi_info *vi = ifp->if_softc;
548 struct adapter *sc = vi->pi->adapter;
549 int rc;
550
551 rc = begin_synchronized_op(sc, vi, SLEEP_OK | INTR_OK, "t4nmreg");
552 if (rc != 0)
553 return (rc);
554 if (on)
555 rc = cxgbe_netmap_on(sc, vi, ifp, na);
556 else
557 rc = cxgbe_netmap_off(sc, vi, ifp, na);
558 end_synchronized_op(sc, 0);
559
560 return (rc);
561 }
562
563 /* How many packets can a single type1 WR carry in n descriptors */
564 static inline int
ndesc_to_npkt(const int n)565 ndesc_to_npkt(const int n)
566 {
567
568 MPASS(n > 0 && n <= SGE_MAX_WR_NDESC);
569
570 return (n * 2 - 1);
571 }
572 #define MAX_NPKT_IN_TYPE1_WR (ndesc_to_npkt(SGE_MAX_WR_NDESC))
573
574 /* Space (in descriptors) needed for a type1 WR that carries n packets */
575 static inline int
npkt_to_ndesc(const int n)576 npkt_to_ndesc(const int n)
577 {
578
579 MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
580
581 return ((n + 2) / 2);
582 }
583
584 /* Space (in 16B units) needed for a type1 WR that carries n packets */
585 static inline int
npkt_to_len16(const int n)586 npkt_to_len16(const int n)
587 {
588
589 MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
590
591 return (n * 2 + 1);
592 }
593
594 #define NMIDXDIFF(q, idx) IDXDIFF((q)->pidx, (q)->idx, (q)->sidx)
595
596 static void
ring_nm_txq_db(struct adapter * sc,struct sge_nm_txq * nm_txq)597 ring_nm_txq_db(struct adapter *sc, struct sge_nm_txq *nm_txq)
598 {
599 int n;
600 u_int db = nm_txq->doorbells;
601
602 MPASS(nm_txq->pidx != nm_txq->dbidx);
603
604 n = NMIDXDIFF(nm_txq, dbidx);
605 if (n > 1)
606 clrbit(&db, DOORBELL_WCWR);
607 wmb();
608
609 switch (ffs(db) - 1) {
610 case DOORBELL_UDB:
611 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
612 break;
613
614 case DOORBELL_WCWR: {
615 volatile uint64_t *dst, *src;
616
617 /*
618 * Queues whose 128B doorbell segment fits in the page do not
619 * use relative qid (udb_qid is always 0). Only queues with
620 * doorbell segments can do WCWR.
621 */
622 KASSERT(nm_txq->udb_qid == 0 && n == 1,
623 ("%s: inappropriate doorbell (0x%x, %d, %d) for nm_txq %p",
624 __func__, nm_txq->doorbells, n, nm_txq->pidx, nm_txq));
625
626 dst = (volatile void *)((uintptr_t)nm_txq->udb +
627 UDBS_WR_OFFSET - UDBS_DB_OFFSET);
628 src = (void *)&nm_txq->desc[nm_txq->dbidx];
629 while (src != (void *)&nm_txq->desc[nm_txq->dbidx + 1])
630 *dst++ = *src++;
631 wmb();
632 break;
633 }
634
635 case DOORBELL_UDBWC:
636 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
637 wmb();
638 break;
639
640 case DOORBELL_KDB:
641 t4_write_reg(sc, sc->sge_kdoorbell_reg,
642 V_QID(nm_txq->cntxt_id) | V_PIDX(n));
643 break;
644 }
645 nm_txq->dbidx = nm_txq->pidx;
646 }
647
648 /*
649 * Write work requests to send 'npkt' frames and ring the doorbell to send them
650 * on their way. No need to check for wraparound.
651 */
652 static void
cxgbe_nm_tx(struct adapter * sc,struct sge_nm_txq * nm_txq,struct netmap_kring * kring,int npkt,int npkt_remaining,int txcsum)653 cxgbe_nm_tx(struct adapter *sc, struct sge_nm_txq *nm_txq,
654 struct netmap_kring *kring, int npkt, int npkt_remaining, int txcsum)
655 {
656 struct netmap_ring *ring = kring->ring;
657 struct netmap_slot *slot;
658 const u_int lim = kring->nkr_num_slots - 1;
659 struct fw_eth_tx_pkts_wr *wr = (void *)&nm_txq->desc[nm_txq->pidx];
660 uint16_t len;
661 uint64_t ba;
662 struct cpl_tx_pkt_core *cpl;
663 struct ulptx_sgl *usgl;
664 int i, n;
665
666 while (npkt) {
667 n = min(npkt, MAX_NPKT_IN_TYPE1_WR);
668 len = 0;
669
670 wr = (void *)&nm_txq->desc[nm_txq->pidx];
671 wr->op_pkd = htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS_WR));
672 wr->equiq_to_len16 = htobe32(V_FW_WR_LEN16(npkt_to_len16(n)));
673 wr->npkt = n;
674 wr->r3 = 0;
675 wr->type = 1;
676 cpl = (void *)(wr + 1);
677
678 for (i = 0; i < n; i++) {
679 slot = &ring->slot[kring->nr_hwcur];
680 PNMB(kring->na, slot, &ba);
681 MPASS(ba != 0);
682
683 cpl->ctrl0 = nm_txq->cpl_ctrl0;
684 cpl->pack = 0;
685 cpl->len = htobe16(slot->len);
686 /*
687 * netmap(4) says "netmap does not use features such as
688 * checksum offloading, TCP segmentation offloading,
689 * encryption, VLAN encapsulation/decapsulation, etc."
690 *
691 * So the ncxl interfaces have tx hardware checksumming
692 * disabled by default. But you can override netmap by
693 * enabling IFCAP_TXCSUM on the interface manully.
694 */
695 cpl->ctrl1 = txcsum ? 0 :
696 htobe64(F_TXPKT_IPCSUM_DIS | F_TXPKT_L4CSUM_DIS);
697
698 usgl = (void *)(cpl + 1);
699 usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
700 V_ULPTX_NSGE(1));
701 usgl->len0 = htobe32(slot->len);
702 usgl->addr0 = htobe64(ba);
703
704 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
705 cpl = (void *)(usgl + 1);
706 MPASS(slot->len + len <= UINT16_MAX);
707 len += slot->len;
708 kring->nr_hwcur = nm_next(kring->nr_hwcur, lim);
709 }
710 wr->plen = htobe16(len);
711
712 npkt -= n;
713 nm_txq->pidx += npkt_to_ndesc(n);
714 MPASS(nm_txq->pidx <= nm_txq->sidx);
715 if (__predict_false(nm_txq->pidx == nm_txq->sidx)) {
716 /*
717 * This routine doesn't know how to write WRs that wrap
718 * around. Make sure it wasn't asked to.
719 */
720 MPASS(npkt == 0);
721 nm_txq->pidx = 0;
722 }
723
724 if (npkt == 0 && npkt_remaining == 0) {
725 /* All done. */
726 if (lazy_tx_credit_flush == 0) {
727 wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
728 F_FW_WR_EQUIQ);
729 nm_txq->equeqidx = nm_txq->pidx;
730 nm_txq->equiqidx = nm_txq->pidx;
731 }
732 ring_nm_txq_db(sc, nm_txq);
733 return;
734 }
735
736 if (NMIDXDIFF(nm_txq, equiqidx) >= nm_txq->sidx / 2) {
737 wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
738 F_FW_WR_EQUIQ);
739 nm_txq->equeqidx = nm_txq->pidx;
740 nm_txq->equiqidx = nm_txq->pidx;
741 } else if (NMIDXDIFF(nm_txq, equeqidx) >= 64) {
742 wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ);
743 nm_txq->equeqidx = nm_txq->pidx;
744 }
745 if (NMIDXDIFF(nm_txq, dbidx) >= 2 * SGE_MAX_WR_NDESC)
746 ring_nm_txq_db(sc, nm_txq);
747 }
748
749 /* Will get called again. */
750 MPASS(npkt_remaining);
751 }
752
753 /* How many contiguous free descriptors starting at pidx */
754 static inline int
contiguous_ndesc_available(struct sge_nm_txq * nm_txq)755 contiguous_ndesc_available(struct sge_nm_txq *nm_txq)
756 {
757
758 if (nm_txq->cidx > nm_txq->pidx)
759 return (nm_txq->cidx - nm_txq->pidx - 1);
760 else if (nm_txq->cidx > 0)
761 return (nm_txq->sidx - nm_txq->pidx);
762 else
763 return (nm_txq->sidx - nm_txq->pidx - 1);
764 }
765
766 static int
reclaim_nm_tx_desc(struct sge_nm_txq * nm_txq)767 reclaim_nm_tx_desc(struct sge_nm_txq *nm_txq)
768 {
769 struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
770 uint16_t hw_cidx = spg->cidx; /* snapshot */
771 struct fw_eth_tx_pkts_wr *wr;
772 int n = 0;
773
774 hw_cidx = be16toh(hw_cidx);
775
776 while (nm_txq->cidx != hw_cidx) {
777 wr = (void *)&nm_txq->desc[nm_txq->cidx];
778
779 MPASS(wr->op_pkd == htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS_WR)));
780 MPASS(wr->type == 1);
781 MPASS(wr->npkt > 0 && wr->npkt <= MAX_NPKT_IN_TYPE1_WR);
782
783 n += wr->npkt;
784 nm_txq->cidx += npkt_to_ndesc(wr->npkt);
785
786 /*
787 * We never sent a WR that wrapped around so the credits coming
788 * back, WR by WR, should never cause the cidx to wrap around
789 * either.
790 */
791 MPASS(nm_txq->cidx <= nm_txq->sidx);
792 if (__predict_false(nm_txq->cidx == nm_txq->sidx))
793 nm_txq->cidx = 0;
794 }
795
796 return (n);
797 }
798
799 static int
cxgbe_netmap_txsync(struct netmap_kring * kring,int flags)800 cxgbe_netmap_txsync(struct netmap_kring *kring, int flags)
801 {
802 struct netmap_adapter *na = kring->na;
803 struct ifnet *ifp = na->ifp;
804 struct vi_info *vi = ifp->if_softc;
805 struct adapter *sc = vi->pi->adapter;
806 struct sge_nm_txq *nm_txq = &sc->sge.nm_txq[vi->first_nm_txq + kring->ring_id];
807 const u_int head = kring->rhead;
808 u_int reclaimed = 0;
809 int n, d, npkt_remaining, ndesc_remaining, txcsum;
810
811 /*
812 * Tx was at kring->nr_hwcur last time around and now we need to advance
813 * to kring->rhead. Note that the driver's pidx moves independent of
814 * netmap's kring->nr_hwcur (pidx counts descriptors and the relation
815 * between descriptors and frames isn't 1:1).
816 */
817
818 npkt_remaining = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
819 kring->nkr_num_slots - kring->nr_hwcur + head;
820 txcsum = ifp->if_capenable & (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6);
821 while (npkt_remaining) {
822 reclaimed += reclaim_nm_tx_desc(nm_txq);
823 ndesc_remaining = contiguous_ndesc_available(nm_txq);
824 /* Can't run out of descriptors with packets still remaining */
825 MPASS(ndesc_remaining > 0);
826
827 /* # of desc needed to tx all remaining packets */
828 d = (npkt_remaining / MAX_NPKT_IN_TYPE1_WR) * SGE_MAX_WR_NDESC;
829 if (npkt_remaining % MAX_NPKT_IN_TYPE1_WR)
830 d += npkt_to_ndesc(npkt_remaining % MAX_NPKT_IN_TYPE1_WR);
831
832 if (d <= ndesc_remaining)
833 n = npkt_remaining;
834 else {
835 /* Can't send all, calculate how many can be sent */
836 n = (ndesc_remaining / SGE_MAX_WR_NDESC) *
837 MAX_NPKT_IN_TYPE1_WR;
838 if (ndesc_remaining % SGE_MAX_WR_NDESC)
839 n += ndesc_to_npkt(ndesc_remaining % SGE_MAX_WR_NDESC);
840 }
841
842 /* Send n packets and update nm_txq->pidx and kring->nr_hwcur */
843 npkt_remaining -= n;
844 cxgbe_nm_tx(sc, nm_txq, kring, n, npkt_remaining, txcsum);
845 }
846 MPASS(npkt_remaining == 0);
847 MPASS(kring->nr_hwcur == head);
848 MPASS(nm_txq->dbidx == nm_txq->pidx);
849
850 /*
851 * Second part: reclaim buffers for completed transmissions.
852 */
853 if (reclaimed || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
854 reclaimed += reclaim_nm_tx_desc(nm_txq);
855 kring->nr_hwtail += reclaimed;
856 if (kring->nr_hwtail >= kring->nkr_num_slots)
857 kring->nr_hwtail -= kring->nkr_num_slots;
858 }
859
860 return (0);
861 }
862
863 static int
cxgbe_netmap_rxsync(struct netmap_kring * kring,int flags)864 cxgbe_netmap_rxsync(struct netmap_kring *kring, int flags)
865 {
866 struct netmap_adapter *na = kring->na;
867 struct netmap_ring *ring = kring->ring;
868 struct ifnet *ifp = na->ifp;
869 struct vi_info *vi = ifp->if_softc;
870 struct adapter *sc = vi->pi->adapter;
871 struct sge_nm_rxq *nm_rxq = &sc->sge.nm_rxq[vi->first_nm_rxq + kring->ring_id];
872 u_int const head = kring->rhead;
873 u_int n;
874 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
875
876 if (black_hole)
877 return (0); /* No updates ever. */
878
879 if (netmap_no_pendintr || force_update) {
880 kring->nr_hwtail = atomic_load_acq_32(&nm_rxq->fl_cidx);
881 kring->nr_kflags &= ~NKR_PENDINTR;
882 }
883
884 if (nm_rxq->fl_db_saved > 0 && starve_fl == 0) {
885 wmb();
886 t4_write_reg(sc, sc->sge_kdoorbell_reg,
887 nm_rxq->fl_db_val | V_PIDX(nm_rxq->fl_db_saved));
888 nm_rxq->fl_db_saved = 0;
889 }
890
891 /* Userspace done with buffers from kring->nr_hwcur to head */
892 n = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
893 kring->nkr_num_slots - kring->nr_hwcur + head;
894 n &= ~7U;
895 if (n > 0) {
896 u_int fl_pidx = nm_rxq->fl_pidx;
897 struct netmap_slot *slot = &ring->slot[fl_pidx];
898 uint64_t ba;
899 int i, dbinc = 0, hwidx = nm_rxq->fl_hwidx;
900
901 /*
902 * We always deal with 8 buffers at a time. We must have
903 * stopped at an 8B boundary (fl_pidx) last time around and we
904 * must have a multiple of 8B buffers to give to the freelist.
905 */
906 MPASS((fl_pidx & 7) == 0);
907 MPASS((n & 7) == 0);
908
909 IDXINCR(kring->nr_hwcur, n, kring->nkr_num_slots);
910 IDXINCR(nm_rxq->fl_pidx, n, nm_rxq->fl_sidx);
911
912 while (n > 0) {
913 for (i = 0; i < 8; i++, fl_pidx++, slot++) {
914 PNMB(na, slot, &ba);
915 MPASS(ba != 0);
916 nm_rxq->fl_desc[fl_pidx] = htobe64(ba | hwidx);
917 slot->flags &= ~NS_BUF_CHANGED;
918 MPASS(fl_pidx <= nm_rxq->fl_sidx);
919 }
920 n -= 8;
921 if (fl_pidx == nm_rxq->fl_sidx) {
922 fl_pidx = 0;
923 slot = &ring->slot[0];
924 }
925 if (++dbinc == 8 && n >= 32) {
926 wmb();
927 if (starve_fl)
928 nm_rxq->fl_db_saved += dbinc;
929 else {
930 t4_write_reg(sc, sc->sge_kdoorbell_reg,
931 nm_rxq->fl_db_val | V_PIDX(dbinc));
932 }
933 dbinc = 0;
934 }
935 }
936 MPASS(nm_rxq->fl_pidx == fl_pidx);
937
938 if (dbinc > 0) {
939 wmb();
940 if (starve_fl)
941 nm_rxq->fl_db_saved += dbinc;
942 else {
943 t4_write_reg(sc, sc->sge_kdoorbell_reg,
944 nm_rxq->fl_db_val | V_PIDX(dbinc));
945 }
946 }
947 }
948
949 return (0);
950 }
951
952 void
cxgbe_nm_attach(struct vi_info * vi)953 cxgbe_nm_attach(struct vi_info *vi)
954 {
955 struct port_info *pi;
956 struct adapter *sc;
957 struct netmap_adapter na;
958
959 MPASS(vi->nnmrxq > 0);
960 MPASS(vi->ifp != NULL);
961
962 pi = vi->pi;
963 sc = pi->adapter;
964
965 bzero(&na, sizeof(na));
966
967 na.ifp = vi->ifp;
968 na.na_flags = NAF_BDG_MAYSLEEP;
969
970 /* Netmap doesn't know about the space reserved for the status page. */
971 na.num_tx_desc = vi->qsize_txq - sc->params.sge.spg_len / EQ_ESIZE;
972
973 /*
974 * The freelist's cidx/pidx drives netmap's rx cidx/pidx. So
975 * num_rx_desc is based on the number of buffers that can be held in the
976 * freelist, and not the number of entries in the iq. (These two are
977 * not exactly the same due to the space taken up by the status page).
978 */
979 na.num_rx_desc = rounddown(vi->qsize_rxq, 8);
980 na.nm_txsync = cxgbe_netmap_txsync;
981 na.nm_rxsync = cxgbe_netmap_rxsync;
982 na.nm_register = cxgbe_netmap_reg;
983 na.num_tx_rings = vi->nnmtxq;
984 na.num_rx_rings = vi->nnmrxq;
985 netmap_attach(&na); /* This adds IFCAP_NETMAP to if_capabilities */
986 }
987
988 void
cxgbe_nm_detach(struct vi_info * vi)989 cxgbe_nm_detach(struct vi_info *vi)
990 {
991
992 MPASS(vi->nnmrxq > 0);
993 MPASS(vi->ifp != NULL);
994
995 netmap_detach(vi->ifp);
996 }
997
998 static inline const void *
unwrap_nm_fw6_msg(const struct cpl_fw6_msg * cpl)999 unwrap_nm_fw6_msg(const struct cpl_fw6_msg *cpl)
1000 {
1001
1002 MPASS(cpl->type == FW_TYPE_RSSCPL || cpl->type == FW6_TYPE_RSSCPL);
1003
1004 /* data[0] is RSS header */
1005 return (&cpl->data[1]);
1006 }
1007
1008 static void
handle_nm_sge_egr_update(struct adapter * sc,struct ifnet * ifp,const struct cpl_sge_egr_update * egr)1009 handle_nm_sge_egr_update(struct adapter *sc, struct ifnet *ifp,
1010 const struct cpl_sge_egr_update *egr)
1011 {
1012 uint32_t oq;
1013 struct sge_nm_txq *nm_txq;
1014
1015 oq = be32toh(egr->opcode_qid);
1016 MPASS(G_CPL_OPCODE(oq) == CPL_SGE_EGR_UPDATE);
1017 nm_txq = (void *)sc->sge.eqmap[G_EGR_QID(oq) - sc->sge.eq_start];
1018
1019 netmap_tx_irq(ifp, nm_txq->nid);
1020 }
1021
1022 void
service_nm_rxq(struct sge_nm_rxq * nm_rxq)1023 service_nm_rxq(struct sge_nm_rxq *nm_rxq)
1024 {
1025 struct vi_info *vi = nm_rxq->vi;
1026 struct adapter *sc = vi->pi->adapter;
1027 struct ifnet *ifp = vi->ifp;
1028 struct netmap_adapter *na = NA(ifp);
1029 struct netmap_kring *kring = na->rx_rings[nm_rxq->nid];
1030 struct netmap_ring *ring = kring->ring;
1031 struct iq_desc *d = &nm_rxq->iq_desc[nm_rxq->iq_cidx];
1032 const void *cpl;
1033 uint32_t lq;
1034 u_int work = 0;
1035 uint8_t opcode;
1036 uint32_t fl_cidx = atomic_load_acq_32(&nm_rxq->fl_cidx);
1037 u_int fl_credits = fl_cidx & 7;
1038 u_int ndesc = 0; /* desc processed since last cidx update */
1039 u_int nframes = 0; /* frames processed since last netmap wakeup */
1040
1041 while ((d->rsp.u.type_gen & F_RSPD_GEN) == nm_rxq->iq_gen) {
1042
1043 rmb();
1044
1045 lq = be32toh(d->rsp.pldbuflen_qid);
1046 opcode = d->rss.opcode;
1047 cpl = &d->cpl[0];
1048
1049 switch (G_RSPD_TYPE(d->rsp.u.type_gen)) {
1050 case X_RSPD_TYPE_FLBUF:
1051
1052 /* fall through */
1053
1054 case X_RSPD_TYPE_CPL:
1055 MPASS(opcode < NUM_CPL_CMDS);
1056
1057 switch (opcode) {
1058 case CPL_FW4_MSG:
1059 case CPL_FW6_MSG:
1060 cpl = unwrap_nm_fw6_msg(cpl);
1061 /* fall through */
1062 case CPL_SGE_EGR_UPDATE:
1063 handle_nm_sge_egr_update(sc, ifp, cpl);
1064 break;
1065 case CPL_RX_PKT:
1066 ring->slot[fl_cidx].len = G_RSPD_LEN(lq) -
1067 sc->params.sge.fl_pktshift;
1068 ring->slot[fl_cidx].flags = 0;
1069 nframes++;
1070 if (!(lq & F_RSPD_NEWBUF)) {
1071 MPASS(black_hole == 2);
1072 break;
1073 }
1074 fl_credits++;
1075 if (__predict_false(++fl_cidx == nm_rxq->fl_sidx))
1076 fl_cidx = 0;
1077 break;
1078 default:
1079 panic("%s: unexpected opcode 0x%x on nm_rxq %p",
1080 __func__, opcode, nm_rxq);
1081 }
1082 break;
1083
1084 case X_RSPD_TYPE_INTR:
1085 /* Not equipped to handle forwarded interrupts. */
1086 panic("%s: netmap queue received interrupt for iq %u\n",
1087 __func__, lq);
1088
1089 default:
1090 panic("%s: illegal response type %d on nm_rxq %p",
1091 __func__, G_RSPD_TYPE(d->rsp.u.type_gen), nm_rxq);
1092 }
1093
1094 d++;
1095 if (__predict_false(++nm_rxq->iq_cidx == nm_rxq->iq_sidx)) {
1096 nm_rxq->iq_cidx = 0;
1097 d = &nm_rxq->iq_desc[0];
1098 nm_rxq->iq_gen ^= F_RSPD_GEN;
1099 }
1100
1101 if (__predict_false(++nframes == rx_nframes) && !black_hole) {
1102 atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
1103 netmap_rx_irq(ifp, nm_rxq->nid, &work);
1104 nframes = 0;
1105 }
1106
1107 if (__predict_false(++ndesc == rx_ndesc)) {
1108 if (black_hole && fl_credits >= 8) {
1109 fl_credits /= 8;
1110 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8,
1111 nm_rxq->fl_sidx);
1112 t4_write_reg(sc, sc->sge_kdoorbell_reg,
1113 nm_rxq->fl_db_val | V_PIDX(fl_credits));
1114 fl_credits = fl_cidx & 7;
1115 }
1116 t4_write_reg(sc, sc->sge_gts_reg,
1117 V_CIDXINC(ndesc) |
1118 V_INGRESSQID(nm_rxq->iq_cntxt_id) |
1119 V_SEINTARM(V_QINTR_TIMER_IDX(X_TIMERREG_UPDATE_CIDX)));
1120 ndesc = 0;
1121 }
1122 }
1123
1124 atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
1125 if (black_hole) {
1126 fl_credits /= 8;
1127 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8, nm_rxq->fl_sidx);
1128 t4_write_reg(sc, sc->sge_kdoorbell_reg,
1129 nm_rxq->fl_db_val | V_PIDX(fl_credits));
1130 } else if (nframes > 0)
1131 netmap_rx_irq(ifp, nm_rxq->nid, &work);
1132
1133 t4_write_reg(sc, sc->sge_gts_reg, V_CIDXINC(ndesc) |
1134 V_INGRESSQID((u32)nm_rxq->iq_cntxt_id) |
1135 V_SEINTARM(V_QINTR_TIMER_IDX(holdoff_tmr_idx)));
1136 }
1137 #endif
1138