if_em_netmap.h revision 285349
1227614Sluigi/* 2260368Sluigi * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved. 3227614Sluigi * 4227614Sluigi * Redistribution and use in source and binary forms, with or without 5227614Sluigi * modification, are permitted provided that the following conditions 6227614Sluigi * are met: 7227614Sluigi * 1. Redistributions of source code must retain the above copyright 8227614Sluigi * notice, this list of conditions and the following disclaimer. 9227614Sluigi * 2. Redistributions in binary form must reproduce the above copyright 10227614Sluigi * notice, this list of conditions and the following disclaimer in the 11227614Sluigi * documentation and/or other materials provided with the distribution. 12228276Sluigi * 13227614Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14227614Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15227614Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16227614Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17227614Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18227614Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19227614Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20227614Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21227614Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22227614Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23227614Sluigi * SUCH DAMAGE. 24227614Sluigi */ 25227614Sluigi 26227614Sluigi/* 27227614Sluigi * $FreeBSD: head/sys/dev/netmap/if_em_netmap.h 285349 2015-07-10 05:51:36Z luigi $ 28227614Sluigi * 29259412Sluigi * netmap support for: em. 30228276Sluigi * 31232238Sluigi * For more details on netmap support please see ixgbe_netmap.h 32227614Sluigi */ 33227614Sluigi 34232238Sluigi 35227614Sluigi#include <net/netmap.h> 36227614Sluigi#include <sys/selinfo.h> 37227614Sluigi#include <vm/vm.h> 38227614Sluigi#include <vm/pmap.h> /* vtophys ? */ 39227614Sluigi#include <dev/netmap/netmap_kern.h> 40227614Sluigi 41232238Sluigi 42228276Sluigi// XXX do we need to block/unblock the tasks ? 43227614Sluigistatic void 44227614Sluigiem_netmap_block_tasks(struct adapter *adapter) 45227614Sluigi{ 46227614Sluigi if (adapter->msix > 1) { /* MSIX */ 47227614Sluigi int i; 48227614Sluigi struct tx_ring *txr = adapter->tx_rings; 49227614Sluigi struct rx_ring *rxr = adapter->rx_rings; 50227614Sluigi 51227614Sluigi for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) { 52227614Sluigi taskqueue_block(txr->tq); 53227614Sluigi taskqueue_drain(txr->tq, &txr->tx_task); 54227614Sluigi taskqueue_block(rxr->tq); 55227614Sluigi taskqueue_drain(rxr->tq, &rxr->rx_task); 56227614Sluigi } 57227614Sluigi } else { /* legacy */ 58227614Sluigi taskqueue_block(adapter->tq); 59227614Sluigi taskqueue_drain(adapter->tq, &adapter->link_task); 60227614Sluigi taskqueue_drain(adapter->tq, &adapter->que_task); 61227614Sluigi } 62227614Sluigi} 63227614Sluigi 64227614Sluigi 65227614Sluigistatic void 66227614Sluigiem_netmap_unblock_tasks(struct adapter *adapter) 67227614Sluigi{ 68227614Sluigi if (adapter->msix > 1) { 69227614Sluigi struct tx_ring *txr = adapter->tx_rings; 70227614Sluigi struct rx_ring *rxr = adapter->rx_rings; 71227614Sluigi int i; 72227614Sluigi 73283959Ssbruno for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) { 74227614Sluigi taskqueue_unblock(txr->tq); 75227614Sluigi taskqueue_unblock(rxr->tq); 76227614Sluigi } 77227614Sluigi } else { /* legacy */ 78227614Sluigi taskqueue_unblock(adapter->tq); 79227614Sluigi } 80227614Sluigi} 81227614Sluigi 82231778Sluigi 83227614Sluigi/* 84259412Sluigi * Register/unregister. We are already under netmap lock. 85227614Sluigi */ 86227614Sluigistatic int 87259412Sluigiem_netmap_reg(struct netmap_adapter *na, int onoff) 88227614Sluigi{ 89259412Sluigi struct ifnet *ifp = na->ifp; 90227614Sluigi struct adapter *adapter = ifp->if_softc; 91227614Sluigi 92259412Sluigi EM_CORE_LOCK(adapter); 93227614Sluigi em_disable_intr(adapter); 94227614Sluigi 95227614Sluigi /* Tell the stack that the interface is no longer active */ 96227614Sluigi ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 97227614Sluigi 98227614Sluigi em_netmap_block_tasks(adapter); 99259412Sluigi /* enable or disable flags and callbacks in na and ifp */ 100227614Sluigi if (onoff) { 101259412Sluigi nm_set_native_flags(na); 102227614Sluigi } else { 103259412Sluigi nm_clear_native_flags(na); 104227614Sluigi } 105259412Sluigi em_init_locked(adapter); /* also enable intr */ 106227614Sluigi em_netmap_unblock_tasks(adapter); 107259412Sluigi EM_CORE_UNLOCK(adapter); 108259412Sluigi return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 109227614Sluigi} 110227614Sluigi 111231778Sluigi 112227614Sluigi/* 113232238Sluigi * Reconcile kernel and user view of the transmit ring. 114227614Sluigi */ 115227614Sluigistatic int 116270063Sluigiem_netmap_txsync(struct netmap_kring *kring, int flags) 117227614Sluigi{ 118270063Sluigi struct netmap_adapter *na = kring->na; 119259412Sluigi struct ifnet *ifp = na->ifp; 120227614Sluigi struct netmap_ring *ring = kring->ring; 121259412Sluigi u_int nm_i; /* index into the netmap ring */ 122259412Sluigi u_int nic_i; /* index into the NIC ring */ 123260368Sluigi u_int n; 124259412Sluigi u_int const lim = kring->nkr_num_slots - 1; 125260368Sluigi u_int const head = kring->rhead; 126227614Sluigi /* generate an interrupt approximately every half ring */ 127238985Sluigi u_int report_frequency = kring->nkr_num_slots >> 1; 128227614Sluigi 129259412Sluigi /* device-specific */ 130259412Sluigi struct adapter *adapter = ifp->if_softc; 131270063Sluigi struct tx_ring *txr = &adapter->tx_rings[kring->ring_id]; 132259412Sluigi 133227614Sluigi bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 134227614Sluigi BUS_DMASYNC_POSTREAD); 135227614Sluigi 136232238Sluigi /* 137259412Sluigi * First part: process new packets to send. 138227614Sluigi */ 139259412Sluigi 140259412Sluigi nm_i = kring->nr_hwcur; 141260368Sluigi if (nm_i != head) { /* we have new packets to send */ 142259412Sluigi nic_i = netmap_idx_k2n(kring, nm_i); 143260368Sluigi for (n = 0; nm_i != head; n++) { 144259412Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 145259412Sluigi u_int len = slot->len; 146229939Sluigi uint64_t paddr; 147270063Sluigi void *addr = PNMB(na, slot, &paddr); 148231778Sluigi 149259412Sluigi /* device-specific */ 150259412Sluigi struct e1000_tx_desc *curr = &txr->tx_base[nic_i]; 151259412Sluigi struct em_buffer *txbuf = &txr->tx_buffers[nic_i]; 152259412Sluigi int flags = (slot->flags & NS_REPORT || 153259412Sluigi nic_i == 0 || nic_i == report_frequency) ? 154259412Sluigi E1000_TXD_CMD_RS : 0; 155227614Sluigi 156270063Sluigi NM_CHECK_ADDR_LEN(na, addr, len); 157259412Sluigi 158227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 159229939Sluigi curr->buffer_addr = htole64(paddr); 160228276Sluigi /* buffer has changed, reload map */ 161270063Sluigi netmap_reload_map(na, txr->txtag, txbuf->map, addr); 162227614Sluigi } 163259412Sluigi slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 164259412Sluigi 165259412Sluigi /* Fill the slot in the NIC ring. */ 166232238Sluigi curr->upper.data = 0; 167232238Sluigi curr->lower.data = htole32(adapter->txd_cmd | len | 168232238Sluigi (E1000_TXD_CMD_EOP | flags) ); 169227614Sluigi bus_dmamap_sync(txr->txtag, txbuf->map, 170227614Sluigi BUS_DMASYNC_PREWRITE); 171259412Sluigi 172259412Sluigi nm_i = nm_next(nm_i, lim); 173259412Sluigi nic_i = nm_next(nic_i, lim); 174227614Sluigi } 175260368Sluigi kring->nr_hwcur = head; 176227614Sluigi 177259412Sluigi /* synchronize the NIC ring */ 178227614Sluigi bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, 179259412Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 180227614Sluigi 181259412Sluigi /* (re)start the tx unit up to slot nic_i (excluded) */ 182259412Sluigi E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), nic_i); 183227614Sluigi } 184228276Sluigi 185259412Sluigi /* 186259412Sluigi * Second part: reclaim buffers for completed transmissions. 187259412Sluigi */ 188260368Sluigi if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 189231778Sluigi /* record completed transmissions using TDH */ 190270063Sluigi nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(kring->ring_id)); 191259412Sluigi if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */ 192259412Sluigi D("TDH wrap %d", nic_i); 193259412Sluigi nic_i -= kring->nkr_num_slots; 194228276Sluigi } 195260368Sluigi if (nic_i != txr->next_to_clean) { 196259412Sluigi txr->next_to_clean = nic_i; 197260368Sluigi kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 198228276Sluigi } 199228276Sluigi } 200228276Sluigi 201227614Sluigi return 0; 202227614Sluigi} 203227614Sluigi 204231778Sluigi 205227614Sluigi/* 206228276Sluigi * Reconcile kernel and user view of the receive ring. 207227614Sluigi */ 208227614Sluigistatic int 209270063Sluigiem_netmap_rxsync(struct netmap_kring *kring, int flags) 210227614Sluigi{ 211270063Sluigi struct netmap_adapter *na = kring->na; 212259412Sluigi struct ifnet *ifp = na->ifp; 213227614Sluigi struct netmap_ring *ring = kring->ring; 214259412Sluigi u_int nm_i; /* index into the netmap ring */ 215259412Sluigi u_int nic_i; /* index into the NIC ring */ 216260368Sluigi u_int n; 217259412Sluigi u_int const lim = kring->nkr_num_slots - 1; 218285349Sluigi u_int const head = kring->rhead; 219257529Sluigi int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 220227614Sluigi 221259412Sluigi /* device-specific */ 222259412Sluigi struct adapter *adapter = ifp->if_softc; 223270063Sluigi struct rx_ring *rxr = &adapter->rx_rings[kring->ring_id]; 224259412Sluigi 225260368Sluigi if (head > lim) 226227614Sluigi return netmap_ring_reinit(kring); 227250184Sluigi 228227614Sluigi /* XXX check sync modes */ 229227614Sluigi bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 230227614Sluigi BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 231227614Sluigi 232232238Sluigi /* 233259412Sluigi * First part: import newly received packets. 234228276Sluigi */ 235232238Sluigi if (netmap_no_pendintr || force_update) { 236245579Sluigi uint16_t slot_flags = kring->nkr_slot_flags; 237245579Sluigi 238259412Sluigi nic_i = rxr->next_to_check; 239259412Sluigi nm_i = netmap_idx_n2k(kring, nic_i); 240259412Sluigi 241260368Sluigi for (n = 0; ; n++) { // XXX no need to count 242259412Sluigi struct e1000_rx_desc *curr = &rxr->rx_base[nic_i]; 243232238Sluigi uint32_t staterr = le32toh(curr->status); 244227614Sluigi 245232238Sluigi if ((staterr & E1000_RXD_STAT_DD) == 0) 246232238Sluigi break; 247259412Sluigi ring->slot[nm_i].len = le16toh(curr->length); 248259412Sluigi ring->slot[nm_i].flags = slot_flags; 249259412Sluigi bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[nic_i].map, 250232238Sluigi BUS_DMASYNC_POSTREAD); 251259412Sluigi nm_i = nm_next(nm_i, lim); 252232238Sluigi /* make sure next_to_refresh follows next_to_check */ 253259412Sluigi rxr->next_to_refresh = nic_i; // XXX 254259412Sluigi nic_i = nm_next(nic_i, lim); 255232238Sluigi } 256232238Sluigi if (n) { /* update the state variables */ 257259412Sluigi rxr->next_to_check = nic_i; 258260368Sluigi kring->nr_hwtail = nm_i; 259232238Sluigi } 260232238Sluigi kring->nr_kflags &= ~NKR_PENDINTR; 261227614Sluigi } 262227614Sluigi 263259412Sluigi /* 264259412Sluigi * Second part: skip past packets that userspace has released. 265259412Sluigi */ 266259412Sluigi nm_i = kring->nr_hwcur; 267260368Sluigi if (nm_i != head) { 268259412Sluigi nic_i = netmap_idx_k2n(kring, nm_i); 269260368Sluigi for (n = 0; nm_i != head; n++) { 270259412Sluigi struct netmap_slot *slot = &ring->slot[nm_i]; 271229939Sluigi uint64_t paddr; 272270063Sluigi void *addr = PNMB(na, slot, &paddr); 273227614Sluigi 274259412Sluigi struct e1000_rx_desc *curr = &rxr->rx_base[nic_i]; 275259412Sluigi struct em_buffer *rxbuf = &rxr->rx_buffers[nic_i]; 276227614Sluigi 277270063Sluigi if (addr == NETMAP_BUF_BASE(na)) /* bad buf */ 278259412Sluigi goto ring_reset; 279259412Sluigi 280227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 281259412Sluigi /* buffer has changed, reload map */ 282229939Sluigi curr->buffer_addr = htole64(paddr); 283270063Sluigi netmap_reload_map(na, rxr->rxtag, rxbuf->map, addr); 284227614Sluigi slot->flags &= ~NS_BUF_CHANGED; 285227614Sluigi } 286232238Sluigi curr->status = 0; 287227614Sluigi bus_dmamap_sync(rxr->rxtag, rxbuf->map, 288228276Sluigi BUS_DMASYNC_PREREAD); 289259412Sluigi nm_i = nm_next(nm_i, lim); 290259412Sluigi nic_i = nm_next(nic_i, lim); 291227614Sluigi } 292260368Sluigi kring->nr_hwcur = head; 293259412Sluigi 294227614Sluigi bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, 295228276Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 296227614Sluigi /* 297227614Sluigi * IMPORTANT: we must leave one free slot in the ring, 298259412Sluigi * so move nic_i back by one unit 299227614Sluigi */ 300260368Sluigi nic_i = nm_prev(nic_i, lim); 301259412Sluigi E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), nic_i); 302227614Sluigi } 303259412Sluigi 304227614Sluigi return 0; 305259412Sluigi 306259412Sluigiring_reset: 307259412Sluigi return netmap_ring_reinit(kring); 308227614Sluigi} 309232238Sluigi 310232238Sluigi 311232238Sluigistatic void 312232238Sluigiem_netmap_attach(struct adapter *adapter) 313232238Sluigi{ 314232238Sluigi struct netmap_adapter na; 315232238Sluigi 316232238Sluigi bzero(&na, sizeof(na)); 317232238Sluigi 318232238Sluigi na.ifp = adapter->ifp; 319257529Sluigi na.na_flags = NAF_BDG_MAYSLEEP; 320232238Sluigi na.num_tx_desc = adapter->num_tx_desc; 321232238Sluigi na.num_rx_desc = adapter->num_rx_desc; 322232238Sluigi na.nm_txsync = em_netmap_txsync; 323232238Sluigi na.nm_rxsync = em_netmap_rxsync; 324232238Sluigi na.nm_register = em_netmap_reg; 325259412Sluigi na.num_tx_rings = na.num_rx_rings = adapter->num_queues; 326259412Sluigi netmap_attach(&na); 327232238Sluigi} 328232238Sluigi 329231778Sluigi/* end of file */ 330