if_em_netmap.h revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2011-2014 Matteo Landi, 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: stable/11/sys/dev/netmap/if_em_netmap.h 330897 2018-03-14 03:19:51Z eadler $ 30 * 31 * netmap support for: em. 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// XXX do we need to block/unblock the tasks ? 45static void 46em_netmap_block_tasks(struct adapter *adapter) 47{ 48 if (adapter->msix > 1) { /* MSIX */ 49 int i; 50 struct tx_ring *txr = adapter->tx_rings; 51 struct rx_ring *rxr = adapter->rx_rings; 52 53 for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) { 54 taskqueue_block(txr->tq); 55 taskqueue_drain(txr->tq, &txr->tx_task); 56 taskqueue_block(rxr->tq); 57 taskqueue_drain(rxr->tq, &rxr->rx_task); 58 } 59 } else { /* legacy */ 60 taskqueue_block(adapter->tq); 61 taskqueue_drain(adapter->tq, &adapter->link_task); 62 taskqueue_drain(adapter->tq, &adapter->que_task); 63 } 64} 65 66 67static void 68em_netmap_unblock_tasks(struct adapter *adapter) 69{ 70 if (adapter->msix > 1) { 71 struct tx_ring *txr = adapter->tx_rings; 72 struct rx_ring *rxr = adapter->rx_rings; 73 int i; 74 75 for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) { 76 taskqueue_unblock(txr->tq); 77 taskqueue_unblock(rxr->tq); 78 } 79 } else { /* legacy */ 80 taskqueue_unblock(adapter->tq); 81 } 82} 83 84 85/* 86 * Register/unregister. We are already under netmap lock. 87 */ 88static int 89em_netmap_reg(struct netmap_adapter *na, int onoff) 90{ 91 struct ifnet *ifp = na->ifp; 92 struct adapter *adapter = ifp->if_softc; 93 94 EM_CORE_LOCK(adapter); 95 em_disable_intr(adapter); 96 97 /* Tell the stack that the interface is no longer active */ 98 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 99 100 em_netmap_block_tasks(adapter); 101 /* enable or disable flags and callbacks in na and ifp */ 102 if (onoff) { 103 nm_set_native_flags(na); 104 } else { 105 nm_clear_native_flags(na); 106 } 107 em_init_locked(adapter); /* also enable intr */ 108 em_netmap_unblock_tasks(adapter); 109 EM_CORE_UNLOCK(adapter); 110 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 111} 112 113 114/* 115 * Reconcile kernel and user view of the transmit ring. 116 */ 117static int 118em_netmap_txsync(struct netmap_kring *kring, int flags) 119{ 120 struct netmap_adapter *na = kring->na; 121 struct ifnet *ifp = na->ifp; 122 struct netmap_ring *ring = kring->ring; 123 u_int nm_i; /* index into the netmap ring */ 124 u_int nic_i; /* index into the NIC ring */ 125 u_int n; 126 u_int const lim = kring->nkr_num_slots - 1; 127 u_int const head = kring->rhead; 128 /* generate an interrupt approximately every half ring */ 129 u_int report_frequency = kring->nkr_num_slots >> 1; 130 131 /* device-specific */ 132 struct adapter *adapter = ifp->if_softc; 133 struct tx_ring *txr = &adapter->tx_rings[kring->ring_id]; 134 135 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 136 BUS_DMASYNC_POSTREAD); 137 138 /* 139 * First part: process new packets to send. 140 */ 141 142 nm_i = kring->nr_hwcur; 143 if (nm_i != head) { /* we have new packets to send */ 144 nic_i = netmap_idx_k2n(kring, nm_i); 145 for (n = 0; nm_i != head; n++) { 146 struct netmap_slot *slot = &ring->slot[nm_i]; 147 u_int len = slot->len; 148 uint64_t paddr; 149 void *addr = PNMB(na, slot, &paddr); 150 151 /* device-specific */ 152 struct e1000_tx_desc *curr = &txr->tx_base[nic_i]; 153 struct em_txbuffer *txbuf = &txr->tx_buffers[nic_i]; 154 int flags = (slot->flags & NS_REPORT || 155 nic_i == 0 || nic_i == report_frequency) ? 156 E1000_TXD_CMD_RS : 0; 157 158 NM_CHECK_ADDR_LEN(na, addr, len); 159 160 if (slot->flags & NS_BUF_CHANGED) { 161 curr->buffer_addr = htole64(paddr); 162 /* buffer has changed, reload map */ 163 netmap_reload_map(na, txr->txtag, txbuf->map, addr); 164 } 165 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 166 167 /* Fill the slot in the NIC ring. */ 168 curr->upper.data = 0; 169 curr->lower.data = htole32(adapter->txd_cmd | len | 170 (E1000_TXD_CMD_EOP | flags) ); 171 bus_dmamap_sync(txr->txtag, txbuf->map, 172 BUS_DMASYNC_PREWRITE); 173 174 nm_i = nm_next(nm_i, lim); 175 nic_i = nm_next(nic_i, lim); 176 } 177 kring->nr_hwcur = head; 178 179 /* synchronize the NIC ring */ 180 bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 181 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 182 183 /* (re)start the tx unit up to slot nic_i (excluded) */ 184 E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), nic_i); 185 } 186 187 /* 188 * Second part: reclaim buffers for completed transmissions. 189 */ 190 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 191 /* record completed transmissions using TDH */ 192 nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(kring->ring_id)); 193 if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */ 194 D("TDH wrap %d", nic_i); 195 nic_i -= kring->nkr_num_slots; 196 } 197 if (nic_i != txr->next_to_clean) { 198 txr->next_to_clean = nic_i; 199 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 200 } 201 } 202 203 return 0; 204} 205 206 207/* 208 * Reconcile kernel and user view of the receive ring. 209 */ 210static int 211em_netmap_rxsync(struct netmap_kring *kring, int flags) 212{ 213 struct netmap_adapter *na = kring->na; 214 struct ifnet *ifp = na->ifp; 215 struct netmap_ring *ring = kring->ring; 216 u_int nm_i; /* index into the netmap ring */ 217 u_int nic_i; /* index into the NIC ring */ 218 u_int n; 219 u_int const lim = kring->nkr_num_slots - 1; 220 u_int const head = kring->rhead; 221 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 222 223 /* device-specific */ 224 struct adapter *adapter = ifp->if_softc; 225 struct rx_ring *rxr = &adapter->rx_rings[kring->ring_id]; 226 227 if (head > lim) 228 return netmap_ring_reinit(kring); 229 230 /* XXX check sync modes */ 231 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 232 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 233 234 /* 235 * First part: import newly received packets. 236 */ 237 if (netmap_no_pendintr || force_update) { 238 uint16_t slot_flags = kring->nkr_slot_flags; 239 240 nic_i = rxr->next_to_check; 241 nm_i = netmap_idx_n2k(kring, nic_i); 242 243 for (n = 0; ; n++) { // XXX no need to count 244 union e1000_rx_desc_extended *curr = &rxr->rx_base[nic_i]; 245 uint32_t staterr = le32toh(curr->wb.upper.status_error); 246 247 if ((staterr & E1000_RXD_STAT_DD) == 0) 248 break; 249 ring->slot[nm_i].len = le16toh(curr->wb.upper.length); 250 ring->slot[nm_i].flags = slot_flags; 251 bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[nic_i].map, 252 BUS_DMASYNC_POSTREAD); 253 nm_i = nm_next(nm_i, lim); 254 /* make sure next_to_refresh follows next_to_check */ 255 rxr->next_to_refresh = nic_i; // XXX 256 nic_i = nm_next(nic_i, lim); 257 } 258 if (n) { /* update the state variables */ 259 rxr->next_to_check = nic_i; 260 kring->nr_hwtail = nm_i; 261 } 262 kring->nr_kflags &= ~NKR_PENDINTR; 263 } 264 265 /* 266 * Second part: skip past packets that userspace has released. 267 */ 268 nm_i = kring->nr_hwcur; 269 if (nm_i != head) { 270 nic_i = netmap_idx_k2n(kring, nm_i); 271 for (n = 0; nm_i != head; n++) { 272 struct netmap_slot *slot = &ring->slot[nm_i]; 273 uint64_t paddr; 274 void *addr = PNMB(na, slot, &paddr); 275 276 union e1000_rx_desc_extended *curr = &rxr->rx_base[nic_i]; 277 struct em_rxbuffer *rxbuf = &rxr->rx_buffers[nic_i]; 278 279 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */ 280 goto ring_reset; 281 282 curr->read.buffer_addr = htole64(paddr); 283 if (slot->flags & NS_BUF_CHANGED) { 284 /* buffer has changed, reload map */ 285 netmap_reload_map(na, rxr->rxtag, rxbuf->map, addr); 286 slot->flags &= ~NS_BUF_CHANGED; 287 } 288 curr->wb.upper.status_error = 0; 289 bus_dmamap_sync(rxr->rxtag, rxbuf->map, 290 BUS_DMASYNC_PREREAD); 291 nm_i = nm_next(nm_i, lim); 292 nic_i = nm_next(nic_i, lim); 293 } 294 kring->nr_hwcur = head; 295 296 bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 297 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 298 /* 299 * IMPORTANT: we must leave one free slot in the ring, 300 * so move nic_i back by one unit 301 */ 302 nic_i = nm_prev(nic_i, lim); 303 E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), nic_i); 304 } 305 306 return 0; 307 308ring_reset: 309 return netmap_ring_reinit(kring); 310} 311 312 313static void 314em_netmap_attach(struct adapter *adapter) 315{ 316 struct netmap_adapter na; 317 318 bzero(&na, sizeof(na)); 319 320 na.ifp = adapter->ifp; 321 na.na_flags = NAF_BDG_MAYSLEEP; 322 na.num_tx_desc = adapter->num_tx_desc; 323 na.num_rx_desc = adapter->num_rx_desc; 324 na.nm_txsync = em_netmap_txsync; 325 na.nm_rxsync = em_netmap_rxsync; 326 na.nm_register = em_netmap_reg; 327 na.num_tx_rings = na.num_rx_rings = adapter->num_queues; 328 netmap_attach(&na); 329} 330 331/* end of file */ 332