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 */ 376