sys/dev/netmap/if_re_netmap.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved.
   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 /*
  29  * $FreeBSD$
  30  *
  31  * netmap support for: re
  32  *
  33  * For more details on netmap support please see ixgbe_netmap.h
  34  */
  35
  36
  37 #include <net/netmap.h>
  38 #include <sys/selinfo.h>
  39 #include <vm/vm.h>
  40 #include <vm/pmap.h>    /* vtophys ? */
  41 #include <dev/netmap/netmap_kern.h>
  42
  43
  44 /*
  45  * Register/unregister. We are already under netmap lock.
  46  */
  47 static int
  48 re_netmap_reg(struct netmap_adapter *na, int onoff)
  49 {
  50         struct ifnet *ifp = na->ifp;
  51         struct rl_softc *adapter = ifp->if_softc;
  52
  53         RL_LOCK(adapter);
  54         re_stop(adapter); /* also clears IFF_DRV_RUNNING */
  55         if (onoff) {
  56                 nm_set_native_flags(na);
  57         } else {
  58                 nm_clear_native_flags(na);
  59         }
  60         re_init_locked(adapter);        /* also enables intr */
  61         RL_UNLOCK(adapter);
  62         return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
  63 }
  64
  65
  66 /*
  67  * Reconcile kernel and user view of the transmit ring.
  68  */
  69 static int
  70 re_netmap_txsync(struct netmap_kring *kring, int flags)
  71 {
  72         struct netmap_adapter *na = kring->na;
  73         struct ifnet *ifp = na->ifp;
  74         struct netmap_ring *ring = kring->ring;
  75         u_int nm_i;     /* index into the netmap ring */
  76         u_int nic_i;    /* index into the NIC ring */
  77         u_int n;
  78         u_int const lim = kring->nkr_num_slots - 1;
  79         u_int const head = kring->rhead;
  80
  81         /* device-specific */
  82         struct rl_softc *sc = ifp->if_softc;
  83         struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
  84
  85         bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
  86             sc->rl_ldata.rl_tx_list_map,
  87             BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ?
  88
  89         /*
  90          * First part: process new packets to send.
  91          */
  92         nm_i = kring->nr_hwcur;
  93         if (nm_i != head) {     /* we have new packets to send */
  94                 nic_i = sc->rl_ldata.rl_tx_prodidx;
  95                 // XXX or netmap_idx_k2n(kring, nm_i);
  96
  97                 for (n = 0; nm_i != head; n++) {
  98                         struct netmap_slot *slot = &ring->slot[nm_i];
  99                         u_int len = slot->len;
 100                         uint64_t paddr;
 101                         void *addr = PNMB(na, slot, &paddr);
 102
 103                         /* device-specific */
 104                         struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i];
 105                         int cmd = slot->len | RL_TDESC_CMD_EOF |
 106                                 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
 107
 108                         NM_CHECK_ADDR_LEN(na, addr, len);
 109
 110                         if (nic_i == lim)       /* mark end of ring */
 111                                 cmd |= RL_TDESC_CMD_EOR;
 112
 113                         if (slot->flags & NS_BUF_CHANGED) {
 114                                 /* buffer has changed, reload map */
 115                                 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
 116                                 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
 117                                 netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag,
 118                                         txd[nic_i].tx_dmamap, addr);
 119                         }
 120                         slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
 121
 122                         /* Fill the slot in the NIC ring. */
 123                         desc->rl_cmdstat = htole32(cmd);
 124
 125                         /* make sure changes to the buffer are synced */
 126                         bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
 127                                 txd[nic_i].tx_dmamap,
 128                                 BUS_DMASYNC_PREWRITE);
 129
 130                         nm_i = nm_next(nm_i, lim);
 131                         nic_i = nm_next(nic_i, lim);
 132                 }
 133                 sc->rl_ldata.rl_tx_prodidx = nic_i;
 134                 kring->nr_hwcur = head;
 135
 136                 /* synchronize the NIC ring */
 137                 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
 138                         sc->rl_ldata.rl_tx_list_map,
 139                         BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
 140
 141                 /* start ? */
 142                 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
 143         }
 144
 145         /*
 146          * Second part: reclaim buffers for completed transmissions.
 147          */
 148         if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
 149                 nic_i = sc->rl_ldata.rl_tx_considx;
 150                 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx;
 151                     n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) {
 152                         uint32_t cmdstat =
 153                                 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat);
 154                         if (cmdstat & RL_TDESC_STAT_OWN)
 155                                 break;
 156                 }
 157                 if (n > 0) {
 158                         sc->rl_ldata.rl_tx_considx = nic_i;
 159                         sc->rl_ldata.rl_tx_free += n;
 160                         kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
 161                 }
 162         }
 163
 164         return 0;
 165 }
 166
 167
 168 /*
 169  * Reconcile kernel and user view of the receive ring.
 170  */
 171 static int
 172 re_netmap_rxsync(struct netmap_kring *kring, int flags)
 173 {
 174         struct netmap_adapter *na = kring->na;
 175         struct ifnet *ifp = na->ifp;
 176         struct netmap_ring *ring = kring->ring;
 177         u_int nm_i;     /* index into the netmap ring */
 178         u_int nic_i;    /* index into the NIC ring */
 179         u_int n;
 180         u_int const lim = kring->nkr_num_slots - 1;
 181         u_int const head = kring->rhead;
 182         int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
 183
 184         /* device-specific */
 185         struct rl_softc *sc = ifp->if_softc;
 186         struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
 187
 188         if (head > lim)
 189                 return netmap_ring_reinit(kring);
 190
 191         bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
 192                         sc->rl_ldata.rl_rx_list_map,
 193                         BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
 194
 195         /*
 196          * First part: import newly received packets.
 197          *
 198          * This device uses all the buffers in the ring, so we need
 199          * another termination condition in addition to RL_RDESC_STAT_OWN
 200          * cleared (all buffers could have it cleared). The easiest one
 201          * is to stop right before nm_hwcur.
 202          */
 203         if (netmap_no_pendintr || force_update) {
 204                 uint32_t stop_i = nm_prev(kring->nr_hwcur, lim);
 205
 206                 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
 207                 nm_i = netmap_idx_n2k(kring, nic_i);
 208
 209                 while (nm_i != stop_i) {
 210                         struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i];
 211                         uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
 212                         uint32_t total_len;
 213
 214                         if ((rxstat & RL_RDESC_STAT_OWN) != 0)
 215                                 break;
 216                         total_len = rxstat & sc->rl_rxlenmask;
 217                         /* XXX subtract crc */
 218                         total_len = (total_len < 4) ? 0 : total_len - 4;
 219                         ring->slot[nm_i].len = total_len;
 220                         ring->slot[nm_i].flags = 0;
 221                         /*  sync was in re_newbuf() */
 222                         bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
 223                             rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD);
 224                         // if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1);
 225                         nm_i = nm_next(nm_i, lim);
 226                         nic_i = nm_next(nic_i, lim);
 227                 }
 228                 sc->rl_ldata.rl_rx_prodidx = nic_i;
 229                 kring->nr_hwtail = nm_i;
 230                 kring->nr_kflags &= ~NKR_PENDINTR;
 231         }
 232
 233         /*
 234          * Second part: skip past packets that userspace has released.
 235          */
 236         nm_i = kring->nr_hwcur;
 237         if (nm_i != head) {
 238                 nic_i = netmap_idx_k2n(kring, nm_i);
 239                 for (n = 0; nm_i != head; n++) {
 240                         struct netmap_slot *slot = &ring->slot[nm_i];
 241                         uint64_t paddr;
 242                         void *addr = PNMB(na, slot, &paddr);
 243
 244                         struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i];
 245                         int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN;
 246
 247                         if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
 248                                 goto ring_reset;
 249
 250                         if (nic_i == lim)       /* mark end of ring */
 251                                 cmd |= RL_RDESC_CMD_EOR;
 252
 253                         if (slot->flags & NS_BUF_CHANGED) {
 254                                 /* buffer has changed, reload map */
 255                                 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
 256                                 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
 257                                 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
 258                                         rxd[nic_i].rx_dmamap, addr);
 259                                 slot->flags &= ~NS_BUF_CHANGED;
 260                         }
 261                         desc->rl_cmdstat = htole32(cmd);
 262                         bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
 263                             rxd[nic_i].rx_dmamap,
 264                             BUS_DMASYNC_PREREAD);
 265                         nm_i = nm_next(nm_i, lim);
 266                         nic_i = nm_next(nic_i, lim);
 267                 }
 268                 kring->nr_hwcur = head;
 269
 270                 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
 271                     sc->rl_ldata.rl_rx_list_map,
 272                     BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
 273         }
 274
 275         return 0;
 276
 277 ring_reset:
 278         return netmap_ring_reinit(kring);
 279 }
 280
 281
 282 /*
 283  * Additional routines to init the tx and rx rings.
 284  * In other drivers we do that inline in the main code.
 285  */
 286 static void
 287 re_netmap_tx_init(struct rl_softc *sc)
 288 {
 289         struct rl_txdesc *txd;
 290         struct rl_desc *desc;
 291         int i, n;
 292         struct netmap_adapter *na = NA(sc->rl_ifp);
 293         struct netmap_slot *slot;
 294
 295         slot = netmap_reset(na, NR_TX, 0, 0);
 296         /* slot is NULL if we are not in native netmap mode */
 297         if (!slot)
 298                 return;
 299         /* in netmap mode, overwrite addresses and maps */
 300         txd = sc->rl_ldata.rl_tx_desc;
 301         desc = sc->rl_ldata.rl_tx_list;
 302         n = sc->rl_ldata.rl_tx_desc_cnt;
 303
 304         /* l points in the netmap ring, i points in the NIC ring */
 305         for (i = 0; i < n; i++) {
 306                 uint64_t paddr;
 307                 int l = netmap_idx_n2k(na->tx_rings[0], i);
 308                 void *addr = PNMB(na, slot + l, &paddr);
 309
 310                 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
 311                 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
 312                 netmap_load_map(na, sc->rl_ldata.rl_tx_mtag,
 313                         txd[i].tx_dmamap, addr);
 314         }
 315 }
 316
 317 static void
 318 re_netmap_rx_init(struct rl_softc *sc)
 319 {
 320         struct netmap_adapter *na = NA(sc->rl_ifp);
 321         struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
 322         struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
 323         uint32_t cmdstat;
 324         uint32_t nic_i, max_avail;
 325         uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt;
 326
 327         if (!slot)
 328                 return;
 329         /*
 330          * Do not release the slots owned by userspace,
 331          * and also keep one empty.
 332          */
 333         max_avail = n - 1 - nm_kr_rxspace(na->rx_rings[0]);
 334         for (nic_i = 0; nic_i < n; nic_i++) {
 335                 void *addr;
 336                 uint64_t paddr;
 337                 uint32_t nm_i = netmap_idx_n2k(na->rx_rings[0], nic_i);
 338
 339                 addr = PNMB(na, slot + nm_i, &paddr);
 340
 341                 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
 342                     sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr);
 343                 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
 344                     sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD);
 345                 desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
 346                 desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
 347                 cmdstat = NETMAP_BUF_SIZE(na);
 348                 if (nic_i == n - 1) /* mark the end of ring */
 349                         cmdstat |= RL_RDESC_CMD_EOR;
 350                 if (nic_i < max_avail)
 351                         cmdstat |= RL_RDESC_CMD_OWN;
 352                 desc[nic_i].rl_cmdstat = htole32(cmdstat);
 353         }
 354 }
 355
 356
 357 static void
 358 re_netmap_attach(struct rl_softc *sc)
 359 {
 360         struct netmap_adapter na;
 361
 362         bzero(&na, sizeof(na));
 363
 364         na.ifp = sc->rl_ifp;
 365         na.na_flags = NAF_BDG_MAYSLEEP;
 366         na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
 367         na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
 368         na.nm_txsync = re_netmap_txsync;
 369         na.nm_rxsync = re_netmap_rxsync;
 370         na.nm_register = re_netmap_reg;
 371         na.num_tx_rings = na.num_rx_rings = 1;
 372         netmap_attach(&na);
 373 }
 374
 375 /* end of file */