if_igb_netmap.h revision 231198
1/* 2 * Copyright (C) 2011 Universita` di Pisa. 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: head/sys/dev/netmap/if_igb_netmap.h 231198 2012-02-08 11:43:29Z luigi $ 28 * $Id: if_igb_netmap.h 9802 2011-12-02 18:42:37Z luigi $ 29 * 30 * netmap modifications for igb 31 * contribured by Ahmed Kooli 32 */ 33 34#include <net/netmap.h> 35#include <sys/selinfo.h> 36#include <vm/vm.h> 37#include <vm/pmap.h> /* vtophys ? */ 38#include <dev/netmap/netmap_kern.h> 39 40static int igb_netmap_reg(struct ifnet *, int onoff); 41static int igb_netmap_txsync(void *, u_int, int); 42static int igb_netmap_rxsync(void *, u_int, int); 43static void igb_netmap_lock_wrapper(void *, int, u_int); 44 45 46static void 47igb_netmap_attach(struct adapter *adapter) 48{ 49 struct netmap_adapter na; 50 51 bzero(&na, sizeof(na)); 52 53 na.ifp = adapter->ifp; 54 na.separate_locks = 1; 55 na.num_tx_desc = adapter->num_tx_desc; 56 na.num_rx_desc = adapter->num_rx_desc; 57 na.nm_txsync = igb_netmap_txsync; 58 na.nm_rxsync = igb_netmap_rxsync; 59 na.nm_lock = igb_netmap_lock_wrapper; 60 na.nm_register = igb_netmap_reg; 61 netmap_attach(&na, adapter->num_queues); 62} 63 64 65/* 66 * wrapper to export locks to the generic code 67 */ 68static void 69igb_netmap_lock_wrapper(void *_a, int what, u_int queueid) 70{ 71 struct adapter *adapter = _a; 72 73 ASSERT(queueid < adapter->num_queues); 74 switch (what) { 75 case NETMAP_CORE_LOCK: 76 IGB_CORE_LOCK(adapter); 77 break; 78 case NETMAP_CORE_UNLOCK: 79 IGB_CORE_UNLOCK(adapter); 80 break; 81 case NETMAP_TX_LOCK: 82 IGB_TX_LOCK(&adapter->tx_rings[queueid]); 83 break; 84 case NETMAP_TX_UNLOCK: 85 IGB_TX_UNLOCK(&adapter->tx_rings[queueid]); 86 break; 87 case NETMAP_RX_LOCK: 88 IGB_RX_LOCK(&adapter->rx_rings[queueid]); 89 break; 90 case NETMAP_RX_UNLOCK: 91 IGB_RX_UNLOCK(&adapter->rx_rings[queueid]); 92 break; 93 } 94} 95 96 97/* 98 * support for netmap register/unregisted. We are already under core lock. 99 * only called on the first init or the last unregister. 100 */ 101static int 102igb_netmap_reg(struct ifnet *ifp, int onoff) 103{ 104 struct adapter *adapter = ifp->if_softc; 105 struct netmap_adapter *na = NA(ifp); 106 int error = 0; 107 108 if (na == NULL) 109 return EINVAL; 110 111 igb_disable_intr(adapter); 112 113 /* Tell the stack that the interface is no longer active */ 114 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 115 116 if (onoff) { 117 ifp->if_capenable |= IFCAP_NETMAP; 118 119 /* save if_transmit to restore it later */ 120 na->if_transmit = ifp->if_transmit; 121 ifp->if_transmit = netmap_start; 122 123 igb_init_locked(adapter); 124 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) { 125 error = ENOMEM; 126 goto fail; 127 } 128 } else { 129fail: 130 /* restore if_transmit */ 131 ifp->if_transmit = na->if_transmit; 132 ifp->if_capenable &= ~IFCAP_NETMAP; 133 igb_init_locked(adapter); /* also enables intr */ 134 } 135 return (error); 136} 137 138 139/* 140 * Reconcile kernel and user view of the transmit ring. 141 */ 142static int 143igb_netmap_txsync(void *a, u_int ring_nr, int do_lock) 144{ 145 struct adapter *adapter = a; 146 struct tx_ring *txr = &adapter->tx_rings[ring_nr]; 147 struct netmap_adapter *na = NA(adapter->ifp); 148 struct netmap_kring *kring = &na->tx_rings[ring_nr]; 149 struct netmap_ring *ring = kring->ring; 150 int j, k, l, n = 0, lim = kring->nkr_num_slots - 1; 151 152 /* generate an interrupt approximately every half ring */ 153 int report_frequency = kring->nkr_num_slots >> 1; 154 155 k = ring->cur; 156 if (k > lim) 157 return netmap_ring_reinit(kring); 158 159 if (do_lock) 160 IGB_TX_LOCK(txr); 161 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 162 BUS_DMASYNC_POSTREAD); 163 164 /* update avail to what the hardware knows */ 165 ring->avail = kring->nr_hwavail; 166 167 j = kring->nr_hwcur; /* netmap ring index */ 168 if (j != k) { /* we have new packets to send */ 169 u32 olinfo_status = 0; 170 171 l = j - kring->nkr_hwofs; /* NIC ring index */ 172 if (l < 0) 173 l += lim + 1; 174 /* 82575 needs the queue index added */ 175 if (adapter->hw.mac.type == e1000_82575) 176 olinfo_status |= txr->me << 4; 177 178 while (j != k) { 179 struct netmap_slot *slot = &ring->slot[j]; 180 struct igb_tx_buffer *txbuf = &txr->tx_buffers[l]; 181 union e1000_adv_tx_desc *curr = 182 (union e1000_adv_tx_desc *)&txr->tx_base[l]; 183 uint64_t paddr; 184 void *addr = PNMB(slot, &paddr); 185 int flags = ((slot->flags & NS_REPORT) || 186 j == 0 || j == report_frequency) ? 187 E1000_ADVTXD_DCMD_RS : 0; 188 int len = slot->len; 189 190 if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) { 191 if (do_lock) 192 IGB_TX_UNLOCK(txr); 193 return netmap_ring_reinit(kring); 194 } 195 196 slot->flags &= ~NS_REPORT; 197 // XXX do we need to set the address ? 198 curr->read.buffer_addr = htole64(paddr); 199 curr->read.olinfo_status = 200 htole32(olinfo_status | 201 (len<< E1000_ADVTXD_PAYLEN_SHIFT)); 202 curr->read.cmd_type_len = 203 htole32(len | E1000_ADVTXD_DTYP_DATA | 204 E1000_ADVTXD_DCMD_IFCS | 205 E1000_ADVTXD_DCMD_DEXT | 206 E1000_ADVTXD_DCMD_EOP | flags); 207 if (slot->flags & NS_BUF_CHANGED) { 208 /* buffer has changed, reload map */ 209 netmap_reload_map(txr->txtag, txbuf->map, addr); 210 slot->flags &= ~NS_BUF_CHANGED; 211 } 212 213 bus_dmamap_sync(txr->txtag, txbuf->map, 214 BUS_DMASYNC_PREWRITE); 215 j = (j == lim) ? 0 : j + 1; 216 l = (l == lim) ? 0 : l + 1; 217 n++; 218 } 219 kring->nr_hwcur = k; 220 221 /* decrease avail by number of sent packets */ 222 kring->nr_hwavail -= n; 223 ring->avail = kring->nr_hwavail; 224 225 /* Set the watchdog XXX ? */ 226 txr->queue_status = IGB_QUEUE_WORKING; 227 txr->watchdog_time = ticks; 228 229 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 230 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 231 232 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), l); 233 } 234 if (n == 0 || kring->nr_hwavail < 1) { 235 int delta; 236 237 /* record completed transmission using TDH */ 238 l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr)); 239 if (l >= kring->nkr_num_slots) /* XXX can it happen ? */ 240 l -= kring->nkr_num_slots; 241 delta = l - txr->next_to_clean; 242 if (delta) { 243 /* new tx were completed */ 244 if (delta < 0) 245 delta += kring->nkr_num_slots; 246 txr->next_to_clean = l; 247 kring->nr_hwavail += delta; 248 ring->avail = kring->nr_hwavail; 249 } 250 } 251 if (do_lock) 252 IGB_TX_UNLOCK(txr); 253 return 0; 254} 255 256 257/* 258 * Reconcile kernel and user view of the receive ring. 259 */ 260static int 261igb_netmap_rxsync(void *a, u_int ring_nr, int do_lock) 262{ 263 struct adapter *adapter = a; 264 struct rx_ring *rxr = &adapter->rx_rings[ring_nr]; 265 struct netmap_adapter *na = NA(adapter->ifp); 266 struct netmap_kring *kring = &na->rx_rings[ring_nr]; 267 struct netmap_ring *ring = kring->ring; 268 int j, k, l, n, lim = kring->nkr_num_slots - 1; 269 270 k = ring->cur; 271 if (k > lim) 272 return netmap_ring_reinit(kring); 273 274 if (do_lock) 275 IGB_RX_LOCK(rxr); 276 277 /* Sync the ring. */ 278 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 279 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 280 281 l = rxr->next_to_check; 282 j = l + kring->nkr_hwofs; 283 if (j > lim) 284 j -= lim + 1; 285 for (n = 0; ; n++) { 286 union e1000_adv_rx_desc *curr = &rxr->rx_base[l]; 287 uint32_t staterr = le32toh(curr->wb.upper.status_error); 288 289 if ((staterr & E1000_RXD_STAT_DD) == 0) 290 break; 291 ring->slot[j].len = le16toh(curr->wb.upper.length); 292 293 bus_dmamap_sync(rxr->ptag, 294 rxr->rx_buffers[l].pmap, BUS_DMASYNC_POSTREAD); 295 j = (j == lim) ? 0 : j + 1; 296 l = (l == lim) ? 0 : l + 1; 297 } 298 if (n) { 299 rxr->next_to_check = l; 300 kring->nr_hwavail += n; 301 } 302 303 /* skip past packets that userspace has already processed, 304 * making them available for reception. 305 * advance nr_hwcur and issue a bus_dmamap_sync on the 306 * buffers so it is safe to write to them. 307 * Also increase nr_hwavail 308 */ 309 j = kring->nr_hwcur; 310 l = kring->nr_hwcur - kring->nkr_hwofs; 311 if (l < 0) 312 l += lim + 1; 313 if (j != k) { /* userspace has read some packets. */ 314 n = 0; 315 while (j != k) { 316 struct netmap_slot *slot = ring->slot + j; 317 union e1000_adv_rx_desc *curr = &rxr->rx_base[l]; 318 struct igb_rx_buf *rxbuf = rxr->rx_buffers + l; 319 uint64_t paddr; 320 void *addr = PNMB(slot, &paddr); 321 322 if (addr == netmap_buffer_base) { /* bad buf */ 323 if (do_lock) 324 IGB_RX_UNLOCK(rxr); 325 return netmap_ring_reinit(kring); 326 } 327 328 curr->wb.upper.status_error = 0; 329 curr->read.pkt_addr = htole64(paddr); 330 if (slot->flags & NS_BUF_CHANGED) { 331 netmap_reload_map(rxr->ptag, rxbuf->pmap, addr); 332 slot->flags &= ~NS_BUF_CHANGED; 333 } 334 335 bus_dmamap_sync(rxr->ptag, rxbuf->pmap, 336 BUS_DMASYNC_PREREAD); 337 338 j = (j == lim) ? 0 : j + 1; 339 l = (l == lim) ? 0 : l + 1; 340 n++; 341 } 342 kring->nr_hwavail -= n; 343 kring->nr_hwcur = ring->cur; 344 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 345 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 346 /* IMPORTANT: we must leave one free slot in the ring, 347 * so move l back by one unit 348 */ 349 l = (l == 0) ? lim : l - 1; 350 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l); 351 } 352 /* tell userspace that there are new packets */ 353 ring->avail = kring->nr_hwavail ; 354 if (do_lock) 355 IGB_RX_UNLOCK(rxr); 356 return 0; 357} 358