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 /*
  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
 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_T6) |
 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, &param, &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
 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
 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 =
 278             htobe32(V_FW_EQ_ETH_CMD_FBMIN(chip_id(sc) <= CHELSIO_T5 ?
 279                 X_FETCHBURSTMIN_64B : X_FETCHBURSTMIN_64B_T6) |
 280                 V_FW_EQ_ETH_CMD_FBMAX(X_FETCHBURSTMAX_512B) |
 281                 V_FW_EQ_ETH_CMD_EQSIZE(len / EQ_ESIZE));
 282         c.eqaddr = htobe64(nm_txq->ba);
 283
 284         rc = -t4_wr_mbox(sc, sc->mbox, &c, sizeof(c), &c);
 285         if (rc != 0) {
 286                 device_printf(vi->dev,
 287                     "failed to create netmap egress queue: %d\n", rc);
 288                 return (rc);
 289         }
 290
 291         nm_txq->cntxt_id = G_FW_EQ_ETH_CMD_EQID(be32toh(c.eqid_pkd));
 292         cntxt_id = nm_txq->cntxt_id - sc->sge.eq_start;
 293         if (cntxt_id >= sc->sge.neq)
 294             panic("%s: nm_txq->cntxt_id (%d) more than the max (%d)", __func__,
 295                 cntxt_id, sc->sge.neq - 1);
 296         sc->sge.eqmap[cntxt_id] = (void *)nm_txq;
 297
 298         nm_txq->pidx = nm_txq->cidx = 0;
 299         MPASS(nm_txq->sidx == na->num_tx_desc);
 300         nm_txq->equiqidx = nm_txq->equeqidx = nm_txq->dbidx = 0;
 301
 302         nm_txq->doorbells = sc->doorbells;
 303         if (isset(&nm_txq->doorbells, DOORBELL_UDB) ||
 304             isset(&nm_txq->doorbells, DOORBELL_UDBWC) ||
 305             isset(&nm_txq->doorbells, DOORBELL_WCWR)) {
 306                 uint32_t s_qpp = sc->params.sge.eq_s_qpp;
 307                 uint32_t mask = (1 << s_qpp) - 1;
 308                 volatile uint8_t *udb;
 309
 310                 udb = sc->udbs_base + UDBS_DB_OFFSET;
 311                 udb += (nm_txq->cntxt_id >> s_qpp) << PAGE_SHIFT;
 312                 nm_txq->udb_qid = nm_txq->cntxt_id & mask;
 313                 if (nm_txq->udb_qid >= PAGE_SIZE / UDBS_SEG_SIZE)
 314                         clrbit(&nm_txq->doorbells, DOORBELL_WCWR);
 315                 else {
 316                         udb += nm_txq->udb_qid << UDBS_SEG_SHIFT;
 317                         nm_txq->udb_qid = 0;
 318                 }
 319                 nm_txq->udb = (volatile void *)udb;
 320         }
 321
 322         return (rc);
 323 }
 324
 325 static int
 326 free_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq)
 327 {
 328         struct adapter *sc = vi->pi->adapter;
 329         int rc;
 330
 331         rc = -t4_eth_eq_free(sc, sc->mbox, sc->pf, 0, nm_txq->cntxt_id);
 332         if (rc != 0)
 333                 device_printf(sc->dev, "%s: failed for eq %d: %d\n", __func__,
 334                     nm_txq->cntxt_id, rc);
 335         nm_txq->cntxt_id = INVALID_NM_TXQ_CNTXT_ID;
 336         return (rc);
 337 }
 338
 339 static int
 340 cxgbe_netmap_on(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
 341     struct netmap_adapter *na)
 342 {
 343         struct netmap_slot *slot;
 344         struct netmap_kring *kring;
 345         struct sge_nm_rxq *nm_rxq;
 346         struct sge_nm_txq *nm_txq;
 347         int rc, i, j, hwidx, defq, nrssq;
 348         struct hw_buf_info *hwb;
 349
 350         ASSERT_SYNCHRONIZED_OP(sc);
 351
 352         if ((vi->flags & VI_INIT_DONE) == 0 ||
 353             (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 354                 return (EAGAIN);
 355
 356         hwb = &sc->sge.hw_buf_info[0];
 357         for (i = 0; i < SGE_FLBUF_SIZES; i++, hwb++) {
 358                 if (hwb->size == NETMAP_BUF_SIZE(na))
 359                         break;
 360         }
 361         if (i >= SGE_FLBUF_SIZES) {
 362                 if_printf(ifp, "no hwidx for netmap buffer size %d.\n",
 363                     NETMAP_BUF_SIZE(na));
 364                 return (ENXIO);
 365         }
 366         hwidx = i;
 367
 368         /* Must set caps before calling netmap_reset */
 369         nm_set_native_flags(na);
 370
 371         for_each_nm_rxq(vi, i, nm_rxq) {
 372                 kring = na->rx_rings[nm_rxq->nid];
 373                 if (!nm_kring_pending_on(kring) ||
 374                     nm_rxq->iq_cntxt_id != INVALID_NM_RXQ_CNTXT_ID)
 375                         continue;
 376
 377                 alloc_nm_rxq_hwq(vi, nm_rxq, tnl_cong(vi->pi, nm_cong_drop));
 378                 nm_rxq->fl_hwidx = hwidx;
 379                 slot = netmap_reset(na, NR_RX, i, 0);
 380                 MPASS(slot != NULL);    /* XXXNM: error check, not assert */
 381
 382                 /* We deal with 8 bufs at a time */
 383                 MPASS((na->num_rx_desc & 7) == 0);
 384                 MPASS(na->num_rx_desc == nm_rxq->fl_sidx);
 385                 for (j = 0; j < nm_rxq->fl_sidx; j++) {
 386                         uint64_t ba;
 387
 388                         PNMB(na, &slot[j], &ba);
 389                         MPASS(ba != 0);
 390                         nm_rxq->fl_desc[j] = htobe64(ba | hwidx);
 391                 }
 392                 j = nm_rxq->fl_pidx = nm_rxq->fl_sidx - 8;
 393                 MPASS((j & 7) == 0);
 394                 j /= 8; /* driver pidx to hardware pidx */
 395                 wmb();
 396                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
 397                     nm_rxq->fl_db_val | V_PIDX(j));
 398
 399                 (void) atomic_cmpset_int(&nm_rxq->nm_state, NM_OFF, NM_ON);
 400         }
 401
 402         for_each_nm_txq(vi, i, nm_txq) {
 403                 kring = na->tx_rings[nm_txq->nid];
 404                 if (!nm_kring_pending_on(kring) ||
 405                     nm_txq->cntxt_id != INVALID_NM_TXQ_CNTXT_ID)
 406                         continue;
 407
 408                 alloc_nm_txq_hwq(vi, nm_txq);
 409                 slot = netmap_reset(na, NR_TX, i, 0);
 410                 MPASS(slot != NULL);    /* XXXNM: error check, not assert */
 411         }
 412
 413         if (vi->nm_rss == NULL) {
 414                 vi->nm_rss = malloc(vi->rss_size * sizeof(uint16_t), M_CXGBE,
 415                     M_ZERO | M_WAITOK);
 416         }
 417
 418         MPASS(vi->nnmrxq > 0);
 419         if (nm_split_rss == 0 || vi->nnmrxq == 1) {
 420                 for (i = 0; i < vi->rss_size;) {
 421                         for_each_nm_rxq(vi, j, nm_rxq) {
 422                                 vi->nm_rss[i++] = nm_rxq->iq_abs_id;
 423                                 if (i == vi->rss_size)
 424                                         break;
 425                         }
 426                 }
 427                 defq = vi->nm_rss[0];
 428         } else {
 429                 /* We have multiple queues and we want to split the table. */
 430                 MPASS(nm_split_rss != 0);
 431                 MPASS(vi->nnmrxq > 1);
 432
 433                 nm_rxq = &sc->sge.nm_rxq[vi->first_nm_rxq];
 434                 nrssq = vi->nnmrxq;
 435                 if (vi->nnmrxq & 1) {
 436                         /*
 437                          * Odd number of queues. The first rxq is designated the
 438                          * default queue, the rest are split evenly.
 439                          */
 440                         defq = nm_rxq->iq_abs_id;
 441                         nm_rxq++;
 442                         nrssq--;
 443                 } else {
 444                         /*
 445                          * Even number of queues split into two halves.  The
 446                          * first rxq in one of the halves is designated the
 447                          * default queue.
 448                          */
 449 #if 1
 450                         /* First rxq in the first half. */
 451                         defq = nm_rxq->iq_abs_id;
 452 #else
 453                         /* First rxq in the second half. */
 454                         defq = nm_rxq[vi->nnmrxq / 2].iq_abs_id;
 455 #endif
 456                 }
 457
 458                 i = 0;
 459                 while (i < vi->rss_size / 2) {
 460                         for (j = 0; j < nrssq / 2; j++) {
 461                                 vi->nm_rss[i++] = nm_rxq[j].iq_abs_id;
 462                                 if (i == vi->rss_size / 2)
 463                                         break;
 464                         }
 465                 }
 466                 while (i < vi->rss_size) {
 467                         for (j = nrssq / 2; j < nrssq; j++) {
 468                                 vi->nm_rss[i++] = nm_rxq[j].iq_abs_id;
 469                                 if (i == vi->rss_size)
 470                                         break;
 471                         }
 472                 }
 473         }
 474         rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
 475             vi->nm_rss, vi->rss_size);
 476         if (rc != 0)
 477                 if_printf(ifp, "netmap rss_config failed: %d\n", rc);
 478
 479         rc = -t4_config_vi_rss(sc, sc->mbox, vi->viid, vi->hashen, defq, 0, 0);
 480         if (rc != 0)
 481                 if_printf(ifp, "netmap rss hash/defaultq config failed: %d\n", rc);
 482
 483         return (rc);
 484 }
 485
 486 static int
 487 cxgbe_netmap_off(struct adapter *sc, struct vi_info *vi, struct ifnet *ifp,
 488     struct netmap_adapter *na)
 489 {
 490         struct netmap_kring *kring;
 491         int rc, i;
 492         struct sge_nm_txq *nm_txq;
 493         struct sge_nm_rxq *nm_rxq;
 494
 495         ASSERT_SYNCHRONIZED_OP(sc);
 496
 497         if (!nm_netmap_on(na))
 498                 return (0);
 499
 500         if ((vi->flags & VI_INIT_DONE) == 0)
 501                 return (0);
 502
 503         rc = -t4_config_rss_range(sc, sc->mbox, vi->viid, 0, vi->rss_size,
 504             vi->rss, vi->rss_size);
 505         if (rc != 0)
 506                 if_printf(ifp, "failed to restore RSS config: %d\n", rc);
 507         rc = -t4_config_vi_rss(sc, sc->mbox, vi->viid, vi->hashen, vi->rss[0], 0, 0);
 508         if (rc != 0)
 509                 if_printf(ifp, "failed to restore RSS hash/defaultq: %d\n", rc);
 510         nm_clear_native_flags(na);
 511
 512         for_each_nm_txq(vi, i, nm_txq) {
 513                 struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
 514
 515                 kring = na->tx_rings[nm_txq->nid];
 516                 if (!nm_kring_pending_off(kring) ||
 517                     nm_txq->cntxt_id == INVALID_NM_TXQ_CNTXT_ID)
 518                         continue;
 519
 520                 /* Wait for hw pidx to catch up ... */
 521                 while (be16toh(nm_txq->pidx) != spg->pidx)
 522                         pause("nmpidx", 1);
 523
 524                 /* ... and then for the cidx. */
 525                 while (spg->pidx != spg->cidx)
 526                         pause("nmcidx", 1);
 527
 528                 free_nm_txq_hwq(vi, nm_txq);
 529         }
 530         for_each_nm_rxq(vi, i, nm_rxq) {
 531                 kring = na->rx_rings[nm_rxq->nid];
 532                 if (!nm_kring_pending_off(kring) ||
 533                     nm_rxq->iq_cntxt_id == INVALID_NM_RXQ_CNTXT_ID)
 534                         continue;
 535
 536                 while (!atomic_cmpset_int(&nm_rxq->nm_state, NM_ON, NM_OFF))
 537                         pause("nmst", 1);
 538
 539                 free_nm_rxq_hwq(vi, nm_rxq);
 540         }
 541
 542         return (rc);
 543 }
 544
 545 static int
 546 cxgbe_netmap_reg(struct netmap_adapter *na, int on)
 547 {
 548         struct ifnet *ifp = na->ifp;
 549         struct vi_info *vi = ifp->if_softc;
 550         struct adapter *sc = vi->pi->adapter;
 551         int rc;
 552
 553         rc = begin_synchronized_op(sc, vi, SLEEP_OK | INTR_OK, "t4nmreg");
 554         if (rc != 0)
 555                 return (rc);
 556         if (on)
 557                 rc = cxgbe_netmap_on(sc, vi, ifp, na);
 558         else
 559                 rc = cxgbe_netmap_off(sc, vi, ifp, na);
 560         end_synchronized_op(sc, 0);
 561
 562         return (rc);
 563 }
 564
 565 /* How many packets can a single type1 WR carry in n descriptors */
 566 static inline int
 567 ndesc_to_npkt(const int n)
 568 {
 569
 570         MPASS(n > 0 && n <= SGE_MAX_WR_NDESC);
 571
 572         return (n * 2 - 1);
 573 }
 574 #define MAX_NPKT_IN_TYPE1_WR    (ndesc_to_npkt(SGE_MAX_WR_NDESC))
 575
 576 /*
 577  * Space (in descriptors) needed for a type1 WR (TX_PKTS or TX_PKTS2) that
 578  * carries n packets
 579  */
 580 static inline int
 581 npkt_to_ndesc(const int n)
 582 {
 583
 584         MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
 585
 586         return ((n + 2) / 2);
 587 }
 588
 589 /*
 590  * Space (in 16B units) needed for a type1 WR (TX_PKTS or TX_PKTS2) that
 591  * carries n packets
 592  */
 593 static inline int
 594 npkt_to_len16(const int n)
 595 {
 596
 597         MPASS(n > 0 && n <= MAX_NPKT_IN_TYPE1_WR);
 598
 599         return (n * 2 + 1);
 600 }
 601
 602 #define NMIDXDIFF(q, idx) IDXDIFF((q)->pidx, (q)->idx, (q)->sidx)
 603
 604 static void
 605 ring_nm_txq_db(struct adapter *sc, struct sge_nm_txq *nm_txq)
 606 {
 607         int n;
 608         u_int db = nm_txq->doorbells;
 609
 610         MPASS(nm_txq->pidx != nm_txq->dbidx);
 611
 612         n = NMIDXDIFF(nm_txq, dbidx);
 613         if (n > 1)
 614                 clrbit(&db, DOORBELL_WCWR);
 615         wmb();
 616
 617         switch (ffs(db) - 1) {
 618         case DOORBELL_UDB:
 619                 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
 620                 break;
 621
 622         case DOORBELL_WCWR: {
 623                 volatile uint64_t *dst, *src;
 624
 625                 /*
 626                  * Queues whose 128B doorbell segment fits in the page do not
 627                  * use relative qid (udb_qid is always 0).  Only queues with
 628                  * doorbell segments can do WCWR.
 629                  */
 630                 KASSERT(nm_txq->udb_qid == 0 && n == 1,
 631                     ("%s: inappropriate doorbell (0x%x, %d, %d) for nm_txq %p",
 632                     __func__, nm_txq->doorbells, n, nm_txq->pidx, nm_txq));
 633
 634                 dst = (volatile void *)((uintptr_t)nm_txq->udb +
 635                     UDBS_WR_OFFSET - UDBS_DB_OFFSET);
 636                 src = (void *)&nm_txq->desc[nm_txq->dbidx];
 637                 while (src != (void *)&nm_txq->desc[nm_txq->dbidx + 1])
 638                         *dst++ = *src++;
 639                 wmb();
 640                 break;
 641         }
 642
 643         case DOORBELL_UDBWC:
 644                 *nm_txq->udb = htole32(V_QID(nm_txq->udb_qid) | V_PIDX(n));
 645                 wmb();
 646                 break;
 647
 648         case DOORBELL_KDB:
 649                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
 650                     V_QID(nm_txq->cntxt_id) | V_PIDX(n));
 651                 break;
 652         }
 653         nm_txq->dbidx = nm_txq->pidx;
 654 }
 655
 656 /*
 657  * Write work requests to send 'npkt' frames and ring the doorbell to send them
 658  * on their way.  No need to check for wraparound.
 659  */
 660 static void
 661 cxgbe_nm_tx(struct adapter *sc, struct sge_nm_txq *nm_txq,
 662     struct netmap_kring *kring, int npkt, int npkt_remaining, int txcsum)
 663 {
 664         struct netmap_ring *ring = kring->ring;
 665         struct netmap_slot *slot;
 666         const u_int lim = kring->nkr_num_slots - 1;
 667         struct fw_eth_tx_pkts_wr *wr = (void *)&nm_txq->desc[nm_txq->pidx];
 668         uint16_t len;
 669         uint64_t ba;
 670         struct cpl_tx_pkt_core *cpl;
 671         struct ulptx_sgl *usgl;
 672         int i, n;
 673
 674         while (npkt) {
 675                 n = min(npkt, MAX_NPKT_IN_TYPE1_WR);
 676                 len = 0;
 677
 678                 wr = (void *)&nm_txq->desc[nm_txq->pidx];
 679                 wr->op_pkd = nm_txq->op_pkd;
 680                 wr->equiq_to_len16 = htobe32(V_FW_WR_LEN16(npkt_to_len16(n)));
 681                 wr->npkt = n;
 682                 wr->r3 = 0;
 683                 wr->type = 1;
 684                 cpl = (void *)(wr + 1);
 685
 686                 for (i = 0; i < n; i++) {
 687                         slot = &ring->slot[kring->nr_hwcur];
 688                         PNMB(kring->na, slot, &ba);
 689                         MPASS(ba != 0);
 690
 691                         cpl->ctrl0 = nm_txq->cpl_ctrl0;
 692                         cpl->pack = 0;
 693                         cpl->len = htobe16(slot->len);
 694                         /*
 695                          * netmap(4) says "netmap does not use features such as
 696                          * checksum offloading, TCP segmentation offloading,
 697                          * encryption, VLAN encapsulation/decapsulation, etc."
 698                          *
 699                          * So the ncxl interfaces have tx hardware checksumming
 700                          * disabled by default.  But you can override netmap by
 701                          * enabling IFCAP_TXCSUM on the interface manully.
 702                          */
 703                         cpl->ctrl1 = txcsum ? 0 :
 704                             htobe64(F_TXPKT_IPCSUM_DIS | F_TXPKT_L4CSUM_DIS);
 705
 706                         usgl = (void *)(cpl + 1);
 707                         usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
 708                             V_ULPTX_NSGE(1));
 709                         usgl->len0 = htobe32(slot->len);
 710                         usgl->addr0 = htobe64(ba);
 711
 712                         slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
 713                         cpl = (void *)(usgl + 1);
 714                         MPASS(slot->len + len <= UINT16_MAX);
 715                         len += slot->len;
 716                         kring->nr_hwcur = nm_next(kring->nr_hwcur, lim);
 717                 }
 718                 wr->plen = htobe16(len);
 719
 720                 npkt -= n;
 721                 nm_txq->pidx += npkt_to_ndesc(n);
 722                 MPASS(nm_txq->pidx <= nm_txq->sidx);
 723                 if (__predict_false(nm_txq->pidx == nm_txq->sidx)) {
 724                         /*
 725                          * This routine doesn't know how to write WRs that wrap
 726                          * around.  Make sure it wasn't asked to.
 727                          */
 728                         MPASS(npkt == 0);
 729                         nm_txq->pidx = 0;
 730                 }
 731
 732                 if (npkt == 0 && npkt_remaining == 0) {
 733                         /* All done. */
 734                         if (lazy_tx_credit_flush == 0) {
 735                                 wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
 736                                     F_FW_WR_EQUIQ);
 737                                 nm_txq->equeqidx = nm_txq->pidx;
 738                                 nm_txq->equiqidx = nm_txq->pidx;
 739                         }
 740                         ring_nm_txq_db(sc, nm_txq);
 741                         return;
 742                 }
 743
 744                 if (NMIDXDIFF(nm_txq, equiqidx) >= nm_txq->sidx / 2) {
 745                         wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ |
 746                             F_FW_WR_EQUIQ);
 747                         nm_txq->equeqidx = nm_txq->pidx;
 748                         nm_txq->equiqidx = nm_txq->pidx;
 749                 } else if (NMIDXDIFF(nm_txq, equeqidx) >= 64) {
 750                         wr->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ);
 751                         nm_txq->equeqidx = nm_txq->pidx;
 752                 }
 753                 if (NMIDXDIFF(nm_txq, dbidx) >= 2 * SGE_MAX_WR_NDESC)
 754                         ring_nm_txq_db(sc, nm_txq);
 755         }
 756
 757         /* Will get called again. */
 758         MPASS(npkt_remaining);
 759 }
 760
 761 /* How many contiguous free descriptors starting at pidx */
 762 static inline int
 763 contiguous_ndesc_available(struct sge_nm_txq *nm_txq)
 764 {
 765
 766         if (nm_txq->cidx > nm_txq->pidx)
 767                 return (nm_txq->cidx - nm_txq->pidx - 1);
 768         else if (nm_txq->cidx > 0)
 769                 return (nm_txq->sidx - nm_txq->pidx);
 770         else
 771                 return (nm_txq->sidx - nm_txq->pidx - 1);
 772 }
 773
 774 static int
 775 reclaim_nm_tx_desc(struct sge_nm_txq *nm_txq)
 776 {
 777         struct sge_qstat *spg = (void *)&nm_txq->desc[nm_txq->sidx];
 778         uint16_t hw_cidx = spg->cidx;   /* snapshot */
 779         struct fw_eth_tx_pkts_wr *wr;
 780         int n = 0;
 781
 782         hw_cidx = be16toh(hw_cidx);
 783
 784         while (nm_txq->cidx != hw_cidx) {
 785                 wr = (void *)&nm_txq->desc[nm_txq->cidx];
 786
 787                 MPASS(wr->op_pkd == htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS_WR)) ||
 788                     wr->op_pkd == htobe32(V_FW_WR_OP(FW_ETH_TX_PKTS2_WR)));
 789                 MPASS(wr->type == 1);
 790                 MPASS(wr->npkt > 0 && wr->npkt <= MAX_NPKT_IN_TYPE1_WR);
 791
 792                 n += wr->npkt;
 793                 nm_txq->cidx += npkt_to_ndesc(wr->npkt);
 794
 795                 /*
 796                  * We never sent a WR that wrapped around so the credits coming
 797                  * back, WR by WR, should never cause the cidx to wrap around
 798                  * either.
 799                  */
 800                 MPASS(nm_txq->cidx <= nm_txq->sidx);
 801                 if (__predict_false(nm_txq->cidx == nm_txq->sidx))
 802                         nm_txq->cidx = 0;
 803         }
 804
 805         return (n);
 806 }
 807
 808 static int
 809 cxgbe_netmap_txsync(struct netmap_kring *kring, int flags)
 810 {
 811         struct netmap_adapter *na = kring->na;
 812         struct ifnet *ifp = na->ifp;
 813         struct vi_info *vi = ifp->if_softc;
 814         struct adapter *sc = vi->pi->adapter;
 815         struct sge_nm_txq *nm_txq = &sc->sge.nm_txq[vi->first_nm_txq + kring->ring_id];
 816         const u_int head = kring->rhead;
 817         u_int reclaimed = 0;
 818         int n, d, npkt_remaining, ndesc_remaining, txcsum;
 819
 820         /*
 821          * Tx was at kring->nr_hwcur last time around and now we need to advance
 822          * to kring->rhead.  Note that the driver's pidx moves independent of
 823          * netmap's kring->nr_hwcur (pidx counts descriptors and the relation
 824          * between descriptors and frames isn't 1:1).
 825          */
 826
 827         npkt_remaining = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
 828             kring->nkr_num_slots - kring->nr_hwcur + head;
 829         txcsum = ifp->if_capenable & (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6);
 830         while (npkt_remaining) {
 831                 reclaimed += reclaim_nm_tx_desc(nm_txq);
 832                 ndesc_remaining = contiguous_ndesc_available(nm_txq);
 833                 /* Can't run out of descriptors with packets still remaining */
 834                 MPASS(ndesc_remaining > 0);
 835
 836                 /* # of desc needed to tx all remaining packets */
 837                 d = (npkt_remaining / MAX_NPKT_IN_TYPE1_WR) * SGE_MAX_WR_NDESC;
 838                 if (npkt_remaining % MAX_NPKT_IN_TYPE1_WR)
 839                         d += npkt_to_ndesc(npkt_remaining % MAX_NPKT_IN_TYPE1_WR);
 840
 841                 if (d <= ndesc_remaining)
 842                         n = npkt_remaining;
 843                 else {
 844                         /* Can't send all, calculate how many can be sent */
 845                         n = (ndesc_remaining / SGE_MAX_WR_NDESC) *
 846                             MAX_NPKT_IN_TYPE1_WR;
 847                         if (ndesc_remaining % SGE_MAX_WR_NDESC)
 848                                 n += ndesc_to_npkt(ndesc_remaining % SGE_MAX_WR_NDESC);
 849                 }
 850
 851                 /* Send n packets and update nm_txq->pidx and kring->nr_hwcur */
 852                 npkt_remaining -= n;
 853                 cxgbe_nm_tx(sc, nm_txq, kring, n, npkt_remaining, txcsum);
 854         }
 855         MPASS(npkt_remaining == 0);
 856         MPASS(kring->nr_hwcur == head);
 857         MPASS(nm_txq->dbidx == nm_txq->pidx);
 858
 859         /*
 860          * Second part: reclaim buffers for completed transmissions.
 861          */
 862         if (reclaimed || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
 863                 reclaimed += reclaim_nm_tx_desc(nm_txq);
 864                 kring->nr_hwtail += reclaimed;
 865                 if (kring->nr_hwtail >= kring->nkr_num_slots)
 866                         kring->nr_hwtail -= kring->nkr_num_slots;
 867         }
 868
 869         return (0);
 870 }
 871
 872 static int
 873 cxgbe_netmap_rxsync(struct netmap_kring *kring, int flags)
 874 {
 875         struct netmap_adapter *na = kring->na;
 876         struct netmap_ring *ring = kring->ring;
 877         struct ifnet *ifp = na->ifp;
 878         struct vi_info *vi = ifp->if_softc;
 879         struct adapter *sc = vi->pi->adapter;
 880         struct sge_nm_rxq *nm_rxq = &sc->sge.nm_rxq[vi->first_nm_rxq + kring->ring_id];
 881         u_int const head = kring->rhead;
 882         u_int n;
 883         int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
 884
 885         if (black_hole)
 886                 return (0);     /* No updates ever. */
 887
 888         if (netmap_no_pendintr || force_update) {
 889                 kring->nr_hwtail = atomic_load_acq_32(&nm_rxq->fl_cidx);
 890                 kring->nr_kflags &= ~NKR_PENDINTR;
 891         }
 892
 893         if (nm_rxq->fl_db_saved > 0 && starve_fl == 0) {
 894                 wmb();
 895                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
 896                     nm_rxq->fl_db_val | V_PIDX(nm_rxq->fl_db_saved));
 897                 nm_rxq->fl_db_saved = 0;
 898         }
 899
 900         /* Userspace done with buffers from kring->nr_hwcur to head */
 901         n = head >= kring->nr_hwcur ? head - kring->nr_hwcur :
 902             kring->nkr_num_slots - kring->nr_hwcur + head;
 903         n &= ~7U;
 904         if (n > 0) {
 905                 u_int fl_pidx = nm_rxq->fl_pidx;
 906                 struct netmap_slot *slot = &ring->slot[fl_pidx];
 907                 uint64_t ba;
 908                 int i, dbinc = 0, hwidx = nm_rxq->fl_hwidx;
 909
 910                 /*
 911                  * We always deal with 8 buffers at a time.  We must have
 912                  * stopped at an 8B boundary (fl_pidx) last time around and we
 913                  * must have a multiple of 8B buffers to give to the freelist.
 914                  */
 915                 MPASS((fl_pidx & 7) == 0);
 916                 MPASS((n & 7) == 0);
 917
 918                 IDXINCR(kring->nr_hwcur, n, kring->nkr_num_slots);
 919                 IDXINCR(nm_rxq->fl_pidx, n, nm_rxq->fl_sidx);
 920
 921                 while (n > 0) {
 922                         for (i = 0; i < 8; i++, fl_pidx++, slot++) {
 923                                 PNMB(na, slot, &ba);
 924                                 MPASS(ba != 0);
 925                                 nm_rxq->fl_desc[fl_pidx] = htobe64(ba | hwidx);
 926                                 slot->flags &= ~NS_BUF_CHANGED;
 927                                 MPASS(fl_pidx <= nm_rxq->fl_sidx);
 928                         }
 929                         n -= 8;
 930                         if (fl_pidx == nm_rxq->fl_sidx) {
 931                                 fl_pidx = 0;
 932                                 slot = &ring->slot[0];
 933                         }
 934                         if (++dbinc == 8 && n >= 32) {
 935                                 wmb();
 936                                 if (starve_fl)
 937                                         nm_rxq->fl_db_saved += dbinc;
 938                                 else {
 939                                         t4_write_reg(sc, sc->sge_kdoorbell_reg,
 940                                             nm_rxq->fl_db_val | V_PIDX(dbinc));
 941                                 }
 942                                 dbinc = 0;
 943                         }
 944                 }
 945                 MPASS(nm_rxq->fl_pidx == fl_pidx);
 946
 947                 if (dbinc > 0) {
 948                         wmb();
 949                         if (starve_fl)
 950                                 nm_rxq->fl_db_saved += dbinc;
 951                         else {
 952                                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
 953                                     nm_rxq->fl_db_val | V_PIDX(dbinc));
 954                         }
 955                 }
 956         }
 957
 958         return (0);
 959 }
 960
 961 void
 962 cxgbe_nm_attach(struct vi_info *vi)
 963 {
 964         struct port_info *pi;
 965         struct adapter *sc;
 966         struct netmap_adapter na;
 967
 968         MPASS(vi->nnmrxq > 0);
 969         MPASS(vi->ifp != NULL);
 970
 971         pi = vi->pi;
 972         sc = pi->adapter;
 973
 974         bzero(&na, sizeof(na));
 975
 976         na.ifp = vi->ifp;
 977         na.na_flags = NAF_BDG_MAYSLEEP;
 978
 979         /* Netmap doesn't know about the space reserved for the status page. */
 980         na.num_tx_desc = vi->qsize_txq - sc->params.sge.spg_len / EQ_ESIZE;
 981
 982         /*
 983          * The freelist's cidx/pidx drives netmap's rx cidx/pidx.  So
 984          * num_rx_desc is based on the number of buffers that can be held in the
 985          * freelist, and not the number of entries in the iq.  (These two are
 986          * not exactly the same due to the space taken up by the status page).
 987          */
 988         na.num_rx_desc = rounddown(vi->qsize_rxq, 8);
 989         na.nm_txsync = cxgbe_netmap_txsync;
 990         na.nm_rxsync = cxgbe_netmap_rxsync;
 991         na.nm_register = cxgbe_netmap_reg;
 992         na.num_tx_rings = vi->nnmtxq;
 993         na.num_rx_rings = vi->nnmrxq;
 994         netmap_attach(&na);     /* This adds IFCAP_NETMAP to if_capabilities */
 995 }
 996
 997 void
 998 cxgbe_nm_detach(struct vi_info *vi)
 999 {
1000
1001         MPASS(vi->nnmrxq > 0);
1002         MPASS(vi->ifp != NULL);
1003
1004         netmap_detach(vi->ifp);
1005 }
1006
1007 static inline const void *
1008 unwrap_nm_fw6_msg(const struct cpl_fw6_msg *cpl)
1009 {
1010
1011         MPASS(cpl->type == FW_TYPE_RSSCPL || cpl->type == FW6_TYPE_RSSCPL);
1012
1013         /* data[0] is RSS header */
1014         return (&cpl->data[1]);
1015 }
1016
1017 static void
1018 handle_nm_sge_egr_update(struct adapter *sc, struct ifnet *ifp,
1019     const struct cpl_sge_egr_update *egr)
1020 {
1021         uint32_t oq;
1022         struct sge_nm_txq *nm_txq;
1023
1024         oq = be32toh(egr->opcode_qid);
1025         MPASS(G_CPL_OPCODE(oq) == CPL_SGE_EGR_UPDATE);
1026         nm_txq = (void *)sc->sge.eqmap[G_EGR_QID(oq) - sc->sge.eq_start];
1027
1028         netmap_tx_irq(ifp, nm_txq->nid);
1029 }
1030
1031 void
1032 service_nm_rxq(struct sge_nm_rxq *nm_rxq)
1033 {
1034         struct vi_info *vi = nm_rxq->vi;
1035         struct adapter *sc = vi->pi->adapter;
1036         struct ifnet *ifp = vi->ifp;
1037         struct netmap_adapter *na = NA(ifp);
1038         struct netmap_kring *kring = na->rx_rings[nm_rxq->nid];
1039         struct netmap_ring *ring = kring->ring;
1040         struct iq_desc *d = &nm_rxq->iq_desc[nm_rxq->iq_cidx];
1041         const void *cpl;
1042         uint32_t lq;
1043         u_int work = 0;
1044         uint8_t opcode;
1045         uint32_t fl_cidx = atomic_load_acq_32(&nm_rxq->fl_cidx);
1046         u_int fl_credits = fl_cidx & 7;
1047         u_int ndesc = 0;        /* desc processed since last cidx update */
1048         u_int nframes = 0;      /* frames processed since last netmap wakeup */
1049
1050         while ((d->rsp.u.type_gen & F_RSPD_GEN) == nm_rxq->iq_gen) {
1051
1052                 rmb();
1053
1054                 lq = be32toh(d->rsp.pldbuflen_qid);
1055                 opcode = d->rss.opcode;
1056                 cpl = &d->cpl[0];
1057
1058                 switch (G_RSPD_TYPE(d->rsp.u.type_gen)) {
1059                 case X_RSPD_TYPE_FLBUF:
1060
1061                         /* fall through */
1062
1063                 case X_RSPD_TYPE_CPL:
1064                         MPASS(opcode < NUM_CPL_CMDS);
1065
1066                         switch (opcode) {
1067                         case CPL_FW4_MSG:
1068                         case CPL_FW6_MSG:
1069                                 cpl = unwrap_nm_fw6_msg(cpl);
1070                                 /* fall through */
1071                         case CPL_SGE_EGR_UPDATE:
1072                                 handle_nm_sge_egr_update(sc, ifp, cpl);
1073                                 break;
1074                         case CPL_RX_PKT:
1075                                 ring->slot[fl_cidx].len = G_RSPD_LEN(lq) -
1076                                     sc->params.sge.fl_pktshift;
1077                                 ring->slot[fl_cidx].flags = 0;
1078                                 nframes++;
1079                                 if (!(lq & F_RSPD_NEWBUF)) {
1080                                         MPASS(black_hole == 2);
1081                                         break;
1082                                 }
1083                                 fl_credits++;
1084                                 if (__predict_false(++fl_cidx == nm_rxq->fl_sidx))
1085                                         fl_cidx = 0;
1086                                 break;
1087                         default:
1088                                 panic("%s: unexpected opcode 0x%x on nm_rxq %p",
1089                                     __func__, opcode, nm_rxq);
1090                         }
1091                         break;
1092
1093                 case X_RSPD_TYPE_INTR:
1094                         /* Not equipped to handle forwarded interrupts. */
1095                         panic("%s: netmap queue received interrupt for iq %u\n",
1096                             __func__, lq);
1097
1098                 default:
1099                         panic("%s: illegal response type %d on nm_rxq %p",
1100                             __func__, G_RSPD_TYPE(d->rsp.u.type_gen), nm_rxq);
1101                 }
1102
1103                 d++;
1104                 if (__predict_false(++nm_rxq->iq_cidx == nm_rxq->iq_sidx)) {
1105                         nm_rxq->iq_cidx = 0;
1106                         d = &nm_rxq->iq_desc[0];
1107                         nm_rxq->iq_gen ^= F_RSPD_GEN;
1108                 }
1109
1110                 if (__predict_false(++nframes == rx_nframes) && !black_hole) {
1111                         atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
1112                         netmap_rx_irq(ifp, nm_rxq->nid, &work);
1113                         nframes = 0;
1114                 }
1115
1116                 if (__predict_false(++ndesc == rx_ndesc)) {
1117                         if (black_hole && fl_credits >= 8) {
1118                                 fl_credits /= 8;
1119                                 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8,
1120                                     nm_rxq->fl_sidx);
1121                                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
1122                                     nm_rxq->fl_db_val | V_PIDX(fl_credits));
1123                                 fl_credits = fl_cidx & 7;
1124                         }
1125                         t4_write_reg(sc, sc->sge_gts_reg,
1126                             V_CIDXINC(ndesc) |
1127                             V_INGRESSQID(nm_rxq->iq_cntxt_id) |
1128                             V_SEINTARM(V_QINTR_TIMER_IDX(X_TIMERREG_UPDATE_CIDX)));
1129                         ndesc = 0;
1130                 }
1131         }
1132
1133         atomic_store_rel_32(&nm_rxq->fl_cidx, fl_cidx);
1134         if (black_hole) {
1135                 fl_credits /= 8;
1136                 IDXINCR(nm_rxq->fl_pidx, fl_credits * 8, nm_rxq->fl_sidx);
1137                 t4_write_reg(sc, sc->sge_kdoorbell_reg,
1138                     nm_rxq->fl_db_val | V_PIDX(fl_credits));
1139         } else if (nframes > 0)
1140                 netmap_rx_irq(ifp, nm_rxq->nid, &work);
1141
1142         t4_write_reg(sc, sc->sge_gts_reg, V_CIDXINC(ndesc) |
1143             V_INGRESSQID((u32)nm_rxq->iq_cntxt_id) |
1144             V_SEINTARM(V_QINTR_TIMER_IDX(holdoff_tmr_idx)));
1145 }
1146 #endif