if_igb_netmap.h revision 228881
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 228881 2011-12-25 21:00:56Z 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 na.buff_size = NETMAP_BUF_SIZE; 62 netmap_attach(&na, adapter->num_queues); 63} 64 65 66/* 67 * wrapper to export locks to the generic code 68 */ 69static void 70igb_netmap_lock_wrapper(void *_a, int what, u_int queueid) 71{ 72 struct adapter *adapter = _a; 73 74 ASSERT(queueid < adapter->num_queues); 75 switch (what) { 76 case NETMAP_CORE_LOCK: 77 IGB_CORE_LOCK(adapter); 78 break; 79 case NETMAP_CORE_UNLOCK: 80 IGB_CORE_UNLOCK(adapter); 81 break; 82 case NETMAP_TX_LOCK: 83 IGB_TX_LOCK(&adapter->tx_rings[queueid]); 84 break; 85 case NETMAP_TX_UNLOCK: 86 IGB_TX_UNLOCK(&adapter->tx_rings[queueid]); 87 break; 88 case NETMAP_RX_LOCK: 89 IGB_RX_LOCK(&adapter->rx_rings[queueid]); 90 break; 91 case NETMAP_RX_UNLOCK: 92 IGB_RX_UNLOCK(&adapter->rx_rings[queueid]); 93 break; 94 } 95} 96 97 98/* 99 * support for netmap register/unregisted. We are already under core lock. 100 * only called on the first init or the last unregister. 101 */ 102static int 103igb_netmap_reg(struct ifnet *ifp, int onoff) 104{ 105 struct adapter *adapter = ifp->if_softc; 106 struct netmap_adapter *na = NA(ifp); 107 int error = 0; 108 109 if (na == NULL) 110 return EINVAL; 111 112 igb_disable_intr(adapter); 113 114 /* Tell the stack that the interface is no longer active */ 115 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 116 117 if (onoff) { 118 ifp->if_capenable |= IFCAP_NETMAP; 119 120 /* save if_transmit to restore it later */ 121 na->if_transmit = ifp->if_transmit; 122 ifp->if_transmit = netmap_start; 123 124 igb_init_locked(adapter); 125 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) { 126 error = ENOMEM; 127 goto fail; 128 } 129 } else { 130fail: 131 /* restore if_transmit */ 132 ifp->if_transmit = na->if_transmit; 133 ifp->if_capenable &= ~IFCAP_NETMAP; 134 igb_init_locked(adapter); /* also enables intr */ 135 } 136 return (error); 137} 138 139 140/* 141 * Reconcile kernel and user view of the transmit ring. 142 */ 143static int 144igb_netmap_txsync(void *a, u_int ring_nr, int do_lock) 145{ 146 struct adapter *adapter = a; 147 struct tx_ring *txr = &adapter->tx_rings[ring_nr]; 148 struct netmap_adapter *na = NA(adapter->ifp); 149 struct netmap_kring *kring = &na->tx_rings[ring_nr]; 150 struct netmap_ring *ring = kring->ring; 151 int j, k, l, n = 0, lim = kring->nkr_num_slots - 1; 152 153 /* generate an interrupt approximately every half ring */ 154 int report_frequency = kring->nkr_num_slots >> 1; 155 156 k = ring->cur; 157 if (k > lim) 158 return netmap_ring_reinit(kring); 159 160 if (do_lock) 161 IGB_TX_LOCK(txr); 162 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 163 BUS_DMASYNC_POSTREAD); 164 165 /* update avail to what the hardware knows */ 166 ring->avail = kring->nr_hwavail; 167 168 j = kring->nr_hwcur; /* netmap ring index */ 169 if (j != k) { /* we have new packets to send */ 170 u32 olinfo_status = 0; 171 172 l = j - kring->nkr_hwofs; /* NIC ring index */ 173 if (l < 0) 174 l += lim + 1; 175 /* 82575 needs the queue index added */ 176 if (adapter->hw.mac.type == e1000_82575) 177 olinfo_status |= txr->me << 4; 178 179 while (j != k) { 180 struct netmap_slot *slot = &ring->slot[j]; 181 struct igb_tx_buffer *txbuf = &txr->tx_buffers[l]; 182 union e1000_adv_tx_desc *curr = 183 (union e1000_adv_tx_desc *)&txr->tx_base[l]; 184 void *addr = NMB(slot); 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(vtophys(addr)); 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, 210 addr, na->buff_size); 211 slot->flags &= ~NS_BUF_CHANGED; 212 } 213 214 bus_dmamap_sync(txr->txtag, txbuf->map, 215 BUS_DMASYNC_PREWRITE); 216 j = (j == lim) ? 0 : j + 1; 217 l = (l == lim) ? 0 : l + 1; 218 n++; 219 } 220 kring->nr_hwcur = k; 221 222 /* decrease avail by number of sent packets */ 223 kring->nr_hwavail -= n; 224 ring->avail = kring->nr_hwavail; 225 226 /* Set the watchdog XXX ? */ 227 txr->queue_status = IGB_QUEUE_WORKING; 228 txr->watchdog_time = ticks; 229 230 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 231 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 232 233 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), l); 234 } 235 if (n == 0 || kring->nr_hwavail < 1) { 236 int delta; 237 238 /* record completed transmission using TDH */ 239 l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr)); 240 if (l >= kring->nkr_num_slots) /* XXX can it happen ? */ 241 l -= kring->nkr_num_slots; 242 delta = l - txr->next_to_clean; 243 if (delta) { 244 /* new tx were completed */ 245 if (delta < 0) 246 delta += kring->nkr_num_slots; 247 txr->next_to_clean = l; 248 kring->nr_hwavail += delta; 249 ring->avail = kring->nr_hwavail; 250 } 251 } 252 if (do_lock) 253 IGB_TX_UNLOCK(txr); 254 return 0; 255} 256 257 258/* 259 * Reconcile kernel and user view of the receive ring. 260 */ 261static int 262igb_netmap_rxsync(void *a, u_int ring_nr, int do_lock) 263{ 264 struct adapter *adapter = a; 265 struct rx_ring *rxr = &adapter->rx_rings[ring_nr]; 266 struct netmap_adapter *na = NA(adapter->ifp); 267 struct netmap_kring *kring = &na->rx_rings[ring_nr]; 268 struct netmap_ring *ring = kring->ring; 269 int j, k, l, n, lim = kring->nkr_num_slots - 1; 270 271 k = ring->cur; 272 if (k > lim) 273 return netmap_ring_reinit(kring); 274 275 if (do_lock) 276 IGB_RX_LOCK(rxr); 277 278 /* Sync the ring. */ 279 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 280 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 281 282 l = rxr->next_to_check; 283 j = l + kring->nkr_hwofs; 284 if (j > lim) 285 j -= lim + 1; 286 for (n = 0; ; n++) { 287 union e1000_adv_rx_desc *curr = &rxr->rx_base[l]; 288 uint32_t staterr = le32toh(curr->wb.upper.status_error); 289 290 if ((staterr & E1000_RXD_STAT_DD) == 0) 291 break; 292 ring->slot[j].len = le16toh(curr->wb.upper.length); 293 294 bus_dmamap_sync(rxr->ptag, 295 rxr->rx_buffers[l].pmap, BUS_DMASYNC_POSTREAD); 296 j = (j == lim) ? 0 : j + 1; 297 l = (l == lim) ? 0 : l + 1; 298 } 299 if (n) { 300 rxr->next_to_check = l; 301 kring->nr_hwavail += n; 302 } 303 304 /* skip past packets that userspace has already processed, 305 * making them available for reception. 306 * advance nr_hwcur and issue a bus_dmamap_sync on the 307 * buffers so it is safe to write to them. 308 * Also increase nr_hwavail 309 */ 310 j = kring->nr_hwcur; 311 l = kring->nr_hwcur - kring->nkr_hwofs; 312 if (l < 0) 313 l += lim + 1; 314 if (j != k) { /* userspace has read some packets. */ 315 n = 0; 316 while (j != k) { 317 struct netmap_slot *slot = ring->slot + j; 318 union e1000_adv_rx_desc *curr = &rxr->rx_base[l]; 319 struct igb_rx_buf *rxbuf = rxr->rx_buffers + l; 320 void *addr = NMB(slot); 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(vtophys(addr)); 330 if (slot->flags & NS_BUF_CHANGED) { 331 netmap_reload_map(rxr->ptag, rxbuf->pmap, 332 addr, na->buff_size); 333 slot->flags &= ~NS_BUF_CHANGED; 334 } 335 336 bus_dmamap_sync(rxr->ptag, rxbuf->pmap, 337 BUS_DMASYNC_PREREAD); 338 339 j = (j == lim) ? 0 : j + 1; 340 l = (l == lim) ? 0 : l + 1; 341 n++; 342 } 343 kring->nr_hwavail -= n; 344 kring->nr_hwcur = ring->cur; 345 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 346 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 347 /* IMPORTANT: we must leave one free slot in the ring, 348 * so move l back by one unit 349 */ 350 l = (l == 0) ? lim : l - 1; 351 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l); 352 } 353 /* tell userspace that there are new packets */ 354 ring->avail = kring->nr_hwavail ; 355 if (do_lock) 356 IGB_RX_UNLOCK(rxr); 357 return 0; 358} 359