1 /* 2 * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 /* 27 * $FreeBSD$ 28 * 29 * netmap support for: re 30 * 31 * For more details on netmap support please see ixgbe_netmap.h 32 */ 33 34 35 #include <net/netmap.h> 36 #include <sys/selinfo.h> 37 #include <vm/vm.h> 38 #include <vm/pmap.h> /* vtophys ? */ 39 #include <dev/netmap/netmap_kern.h> 40 41 42 /* 43 * Register/unregister. We are already under netmap lock. 44 */ 45 static int 46 re_netmap_reg(struct netmap_adapter *na, int onoff) 47 { 48 struct ifnet *ifp = na->ifp; 49 struct rl_softc *adapter = ifp->if_softc; 50 51 RL_LOCK(adapter); 52 re_stop(adapter); /* also clears IFF_DRV_RUNNING */ 53 if (onoff) { 54 nm_set_native_flags(na); 55 } else { 56 nm_clear_native_flags(na); 57 } 58 re_init_locked(adapter); /* also enables intr */ 59 RL_UNLOCK(adapter); 60 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 61 } 62 63 64 /* 65 * Reconcile kernel and user view of the transmit ring. 66 */ 67 static int 68 re_netmap_txsync(struct netmap_adapter *na, u_int ring_nr, int flags) 69 { 70 struct ifnet *ifp = na->ifp; 71 struct netmap_kring *kring = &na->tx_rings[ring_nr]; 72 struct netmap_ring *ring = kring->ring; 73 u_int nm_i; /* index into the netmap ring */ 74 u_int nic_i; /* index into the NIC ring */ 75 u_int n; 76 u_int const lim = kring->nkr_num_slots - 1; 77 u_int const head = kring->rhead; 78 79 /* device-specific */ 80 struct rl_softc *sc = ifp->if_softc; 81 struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc; 82 83 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 84 sc->rl_ldata.rl_tx_list_map, 85 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ? 86 87 /* 88 * First part: process new packets to send. 89 */ 90 nm_i = kring->nr_hwcur; 91 if (nm_i != head) { /* we have new packets to send */ 92 nic_i = sc->rl_ldata.rl_tx_prodidx; 93 // XXX or netmap_idx_k2n(kring, nm_i); 94 95 for (n = 0; nm_i != head; n++) { 96 struct netmap_slot *slot = &ring->slot[nm_i]; 97 u_int len = slot->len; 98 uint64_t paddr; 99 void *addr = PNMB(slot, &paddr); 100 101 /* device-specific */ 102 struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i]; 103 int cmd = slot->len | RL_TDESC_CMD_EOF | 104 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ; 105 106 NM_CHECK_ADDR_LEN(addr, len); 107 108 if (nic_i == lim) /* mark end of ring */ 109 cmd |= RL_TDESC_CMD_EOR; 110 111 if (slot->flags & NS_BUF_CHANGED) { 112 /* buffer has changed, reload map */ 113 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 114 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 115 netmap_reload_map(sc->rl_ldata.rl_tx_mtag, 116 txd[nic_i].tx_dmamap, addr); 117 } 118 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 119 120 /* Fill the slot in the NIC ring. */ 121 desc->rl_cmdstat = htole32(cmd); 122 123 /* make sure changes to the buffer are synced */ 124 bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag, 125 txd[nic_i].tx_dmamap, 126 BUS_DMASYNC_PREWRITE); 127 128 nm_i = nm_next(nm_i, lim); 129 nic_i = nm_next(nic_i, lim); 130 } 131 sc->rl_ldata.rl_tx_prodidx = nic_i; 132 kring->nr_hwcur = head; 133 134 /* synchronize the NIC ring */ 135 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 136 sc->rl_ldata.rl_tx_list_map, 137 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 138 139 /* start ? */ 140 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START); 141 } 142 143 /* 144 * Second part: reclaim buffers for completed transmissions. 145 */ 146 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 147 nic_i = sc->rl_ldata.rl_tx_considx; 148 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx; 149 n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) { 150 uint32_t cmdstat = 151 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat); 152 if (cmdstat & RL_TDESC_STAT_OWN) 153 break; 154 } 155 if (n > 0) { 156 sc->rl_ldata.rl_tx_considx = nic_i; 157 sc->rl_ldata.rl_tx_free += n; 158 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 159 } 160 } 161 162 nm_txsync_finalize(kring); 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_adapter *na, u_int ring_nr, int flags) 173 { 174 struct ifnet *ifp = na->ifp; 175 struct netmap_kring *kring = &na->rx_rings[ring_nr]; 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 = nm_rxsync_prologue(kring); 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 uint16_t slot_flags = kring->nkr_slot_flags; 205 uint32_t stop_i = nm_prev(kring->nr_hwcur, lim); 206 207 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */ 208 nm_i = netmap_idx_n2k(kring, nic_i); 209 210 while (nm_i != stop_i) { 211 struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i]; 212 uint32_t rxstat = le32toh(cur_rx->rl_cmdstat); 213 uint32_t total_len; 214 215 if ((rxstat & RL_RDESC_STAT_OWN) != 0) 216 break; 217 total_len = rxstat & sc->rl_rxlenmask; 218 /* XXX subtract crc */ 219 total_len = (total_len < 4) ? 0 : total_len - 4; 220 ring->slot[nm_i].len = total_len; 221 ring->slot[nm_i].flags = slot_flags; 222 /* sync was in re_newbuf() */ 223 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 224 rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD); 225 // sc->rl_ifp->if_ipackets++; 226 nm_i = nm_next(nm_i, lim); 227 nic_i = nm_next(nic_i, lim); 228 } 229 sc->rl_ldata.rl_rx_prodidx = nic_i; 230 kring->nr_hwtail = nm_i; 231 kring->nr_kflags &= ~NKR_PENDINTR; 232 } 233 234 /* 235 * Second part: skip past packets that userspace has released. 236 */ 237 nm_i = kring->nr_hwcur; 238 if (nm_i != head) { 239 nic_i = netmap_idx_k2n(kring, nm_i); 240 for (n = 0; nm_i != head; n++) { 241 struct netmap_slot *slot = &ring->slot[nm_i]; 242 uint64_t paddr; 243 void *addr = PNMB(slot, &paddr); 244 245 struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i]; 246 int cmd = NETMAP_BUF_SIZE | RL_RDESC_CMD_OWN; 247 248 if (addr == netmap_buffer_base) /* bad buf */ 249 goto ring_reset; 250 251 if (nic_i == lim) /* mark end of ring */ 252 cmd |= RL_RDESC_CMD_EOR; 253 254 if (slot->flags & NS_BUF_CHANGED) { 255 /* buffer has changed, reload map */ 256 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 257 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 258 netmap_reload_map(sc->rl_ldata.rl_rx_mtag, 259 rxd[nic_i].rx_dmamap, addr); 260 slot->flags &= ~NS_BUF_CHANGED; 261 } 262 desc->rl_cmdstat = htole32(cmd); 263 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 264 rxd[nic_i].rx_dmamap, 265 BUS_DMASYNC_PREREAD); 266 nm_i = nm_next(nm_i, lim); 267 nic_i = nm_next(nic_i, lim); 268 } 269 kring->nr_hwcur = head; 270 271 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 272 sc->rl_ldata.rl_rx_list_map, 273 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 274 } 275 276 /* tell userspace that there might be new packets */ 277 nm_rxsync_finalize(kring); 278 279 return 0; 280 281 ring_reset: 282 return netmap_ring_reinit(kring); 283 } 284 285 286 /* 287 * Additional routines to init the tx and rx rings. 288 * In other drivers we do that inline in the main code. 289 */ 290 static void 291 re_netmap_tx_init(struct rl_softc *sc) 292 { 293 struct rl_txdesc *txd; 294 struct rl_desc *desc; 295 int i, n; 296 struct netmap_adapter *na = NA(sc->rl_ifp); 297 struct netmap_slot *slot; 298 299 if (!na || !(na->na_flags & NAF_NATIVE_ON)) { 300 return; 301 } 302 303 slot = netmap_reset(na, NR_TX, 0, 0); 304 /* slot is NULL if we are not in netmap mode */ 305 if (!slot) 306 return; // XXX cannot happen 307 /* in netmap mode, overwrite addresses and maps */ 308 txd = sc->rl_ldata.rl_tx_desc; 309 desc = sc->rl_ldata.rl_tx_list; 310 n = sc->rl_ldata.rl_tx_desc_cnt; 311 312 /* l points in the netmap ring, i points in the NIC ring */ 313 for (i = 0; i < n; i++) { 314 uint64_t paddr; 315 int l = netmap_idx_n2k(&na->tx_rings[0], i); 316 void *addr = PNMB(slot + l, &paddr); 317 318 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 319 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 320 netmap_load_map(sc->rl_ldata.rl_tx_mtag, 321 txd[i].tx_dmamap, addr); 322 } 323 } 324 325 static void 326 re_netmap_rx_init(struct rl_softc *sc) 327 { 328 struct netmap_adapter *na = NA(sc->rl_ifp); 329 struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0); 330 struct rl_desc *desc = sc->rl_ldata.rl_rx_list; 331 uint32_t cmdstat; 332 uint32_t nic_i, max_avail; 333 uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt; 334 335 if (!slot) 336 return; 337 /* 338 * Do not release the slots owned by userspace, 339 * and also keep one empty. 340 */ 341 max_avail = n - 1 - nm_kr_rxspace(&na->rx_rings[0]); 342 for (nic_i = 0; nic_i < n; nic_i++) { 343 void *addr; 344 uint64_t paddr; 345 uint32_t nm_i = netmap_idx_n2k(&na->rx_rings[0], nic_i); 346 347 addr = PNMB(slot + nm_i, &paddr); 348 349 netmap_reload_map(sc->rl_ldata.rl_rx_mtag, 350 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr); 351 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 352 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD); 353 desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 354 desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 355 cmdstat = NETMAP_BUF_SIZE; 356 if (nic_i == n - 1) /* mark the end of ring */ 357 cmdstat |= RL_RDESC_CMD_EOR; 358 if (nic_i < max_avail) 359 cmdstat |= RL_RDESC_CMD_OWN; 360 desc[nic_i].rl_cmdstat = htole32(cmdstat); 361 } 362 } 363 364 365 static void 366 re_netmap_attach(struct rl_softc *sc) 367 { 368 struct netmap_adapter na; 369 370 bzero(&na, sizeof(na)); 371 372 na.ifp = sc->rl_ifp; 373 na.na_flags = NAF_BDG_MAYSLEEP; 374 na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt; 375 na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt; 376 na.nm_txsync = re_netmap_txsync; 377 na.nm_rxsync = re_netmap_rxsync; 378 na.nm_register = re_netmap_reg; 379 na.num_tx_rings = na.num_rx_rings = 1; 380 netmap_attach(&na); 381 } 382 383 /* end of file */ 384