if_lem_netmap.h revision 232238
1227614Sluigi/* 2227614Sluigi * Copyright (C) 2011 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. 12227614Sluigi * 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 26232238Sluigi 27227614Sluigi/* 28227614Sluigi * $FreeBSD: head/sys/dev/netmap/if_lem_netmap.h 232238 2012-02-27 19:05:01Z luigi $ 29232238Sluigi * $Id: if_lem_netmap.h 10627 2012-02-23 19:37:15Z luigi $ 30227614Sluigi * 31232238Sluigi * netmap support for "lem" 32228276Sluigi * 33232238Sluigi * For details on netmap support please see ixgbe_netmap.h 34227614Sluigi */ 35227614Sluigi 36227614Sluigi#include <net/netmap.h> 37227614Sluigi#include <sys/selinfo.h> 38227614Sluigi#include <vm/vm.h> 39227614Sluigi#include <vm/pmap.h> /* vtophys ? */ 40227614Sluigi#include <dev/netmap/netmap_kern.h> 41227614Sluigi 42227614Sluigi 43227614Sluigistatic void 44231594Sluigilem_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int ringid) 45227614Sluigi{ 46231594Sluigi struct adapter *adapter = ifp->if_softc; 47227614Sluigi 48227614Sluigi /* only one ring here so ignore the ringid */ 49227614Sluigi switch (what) { 50227614Sluigi case NETMAP_CORE_LOCK: 51227614Sluigi EM_CORE_LOCK(adapter); 52227614Sluigi break; 53227614Sluigi case NETMAP_CORE_UNLOCK: 54227614Sluigi EM_CORE_UNLOCK(adapter); 55227614Sluigi break; 56227614Sluigi case NETMAP_TX_LOCK: 57227614Sluigi EM_TX_LOCK(adapter); 58227614Sluigi break; 59227614Sluigi case NETMAP_TX_UNLOCK: 60227614Sluigi EM_TX_UNLOCK(adapter); 61227614Sluigi break; 62227614Sluigi case NETMAP_RX_LOCK: 63227614Sluigi EM_RX_LOCK(adapter); 64227614Sluigi break; 65227614Sluigi case NETMAP_RX_UNLOCK: 66227614Sluigi EM_RX_UNLOCK(adapter); 67227614Sluigi break; 68227614Sluigi } 69227614Sluigi} 70227614Sluigi 71227614Sluigi 72227614Sluigi/* 73232238Sluigi * Register/unregister 74227614Sluigi */ 75227614Sluigistatic int 76228276Sluigilem_netmap_reg(struct ifnet *ifp, int onoff) 77228276Sluigi{ 78228276Sluigi struct adapter *adapter = ifp->if_softc; 79228276Sluigi struct netmap_adapter *na = NA(ifp); 80228276Sluigi int error = 0; 81228276Sluigi 82228276Sluigi if (na == NULL) 83232238Sluigi return EINVAL; 84228276Sluigi 85228276Sluigi lem_disable_intr(adapter); 86228276Sluigi 87228276Sluigi /* Tell the stack that the interface is no longer active */ 88228276Sluigi ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 89228276Sluigi 90228276Sluigi#ifndef EM_LEGACY_IRQ // XXX do we need this ? 91228276Sluigi taskqueue_block(adapter->tq); 92228276Sluigi taskqueue_drain(adapter->tq, &adapter->rxtx_task); 93228276Sluigi taskqueue_drain(adapter->tq, &adapter->link_task); 94228276Sluigi#endif /* !EM_LEGCY_IRQ */ 95228276Sluigi if (onoff) { 96228276Sluigi ifp->if_capenable |= IFCAP_NETMAP; 97228276Sluigi 98228276Sluigi na->if_transmit = ifp->if_transmit; 99228276Sluigi ifp->if_transmit = netmap_start; 100228276Sluigi 101228276Sluigi lem_init_locked(adapter); 102228276Sluigi if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) { 103228276Sluigi error = ENOMEM; 104228276Sluigi goto fail; 105228276Sluigi } 106228276Sluigi } else { 107228276Sluigifail: 108231778Sluigi /* return to non-netmap mode */ 109228276Sluigi ifp->if_transmit = na->if_transmit; 110228276Sluigi ifp->if_capenable &= ~IFCAP_NETMAP; 111231778Sluigi lem_init_locked(adapter); /* also enable intr */ 112228276Sluigi } 113228276Sluigi 114228276Sluigi#ifndef EM_LEGACY_IRQ 115228276Sluigi taskqueue_unblock(adapter->tq); // XXX do we need this ? 116228276Sluigi#endif /* !EM_LEGCY_IRQ */ 117228276Sluigi 118228276Sluigi return (error); 119228276Sluigi} 120228276Sluigi 121228276Sluigi 122228276Sluigi/* 123232238Sluigi * Reconcile kernel and user view of the transmit ring. 124228276Sluigi */ 125228276Sluigistatic int 126231594Sluigilem_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock) 127227614Sluigi{ 128231594Sluigi struct adapter *adapter = ifp->if_softc; 129232238Sluigi struct netmap_adapter *na = NA(ifp); 130231796Sluigi struct netmap_kring *kring = &na->tx_rings[ring_nr]; 131227614Sluigi struct netmap_ring *ring = kring->ring; 132232238Sluigi u_int j, k, l, n = 0, lim = kring->nkr_num_slots - 1; 133227614Sluigi 134227614Sluigi /* generate an interrupt approximately every half ring */ 135227614Sluigi int report_frequency = kring->nkr_num_slots >> 1; 136227614Sluigi 137232238Sluigi /* take a copy of ring->cur now, and never read it again */ 138227614Sluigi k = ring->cur; 139228276Sluigi if (k > lim) 140227614Sluigi return netmap_ring_reinit(kring); 141227614Sluigi 142227614Sluigi if (do_lock) 143227614Sluigi EM_TX_LOCK(adapter); 144227614Sluigi bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map, 145227614Sluigi BUS_DMASYNC_POSTREAD); 146232238Sluigi /* 147232238Sluigi * Process new packets to send. j is the current index in the 148232238Sluigi * netmap ring, l is the corresponding index in the NIC ring. 149231778Sluigi */ 150231778Sluigi j = kring->nr_hwcur; 151232238Sluigi if (j != k) { /* we have new packets to send */ 152232238Sluigi l = netmap_idx_k2n(kring, j); 153231881Sluigi for (n = 0; j != k; n++) { 154232238Sluigi /* slot is the current slot in the netmap ring */ 155227614Sluigi struct netmap_slot *slot = &ring->slot[j]; 156232238Sluigi /* curr is the current slot in the nic ring */ 157228276Sluigi struct e1000_tx_desc *curr = &adapter->tx_desc_base[l]; 158228276Sluigi struct em_buffer *txbuf = &adapter->tx_buffer_area[l]; 159227614Sluigi int flags = ((slot->flags & NS_REPORT) || 160227614Sluigi j == 0 || j == report_frequency) ? 161227614Sluigi E1000_TXD_CMD_RS : 0; 162231778Sluigi uint64_t paddr; 163231778Sluigi void *addr = PNMB(slot, &paddr); 164232238Sluigi u_int len = slot->len; 165227614Sluigi 166227614Sluigi if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) { 167227614Sluigi if (do_lock) 168227614Sluigi EM_TX_UNLOCK(adapter); 169227614Sluigi return netmap_ring_reinit(kring); 170227614Sluigi } 171227614Sluigi 172228276Sluigi slot->flags &= ~NS_REPORT; 173227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 174228276Sluigi /* buffer has changed, reload map */ 175229939Sluigi netmap_reload_map(adapter->txtag, txbuf->map, addr); 176232238Sluigi curr->buffer_addr = htole64(paddr); 177227614Sluigi slot->flags &= ~NS_BUF_CHANGED; 178227614Sluigi } 179232238Sluigi curr->upper.data = 0; 180232238Sluigi curr->lower.data = 181232238Sluigi htole32( adapter->txd_cmd | len | 182232238Sluigi (E1000_TXD_CMD_EOP | flags) ); 183227614Sluigi 184227614Sluigi bus_dmamap_sync(adapter->txtag, txbuf->map, 185228276Sluigi BUS_DMASYNC_PREWRITE); 186227614Sluigi j = (j == lim) ? 0 : j + 1; 187228276Sluigi l = (l == lim) ? 0 : l + 1; 188227614Sluigi } 189232238Sluigi kring->nr_hwcur = k; /* the saved ring->cur */ 190228276Sluigi kring->nr_hwavail -= n; 191227614Sluigi 192227614Sluigi bus_dmamap_sync(adapter->txdma.dma_tag, adapter->txdma.dma_map, 193228276Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 194227614Sluigi 195228276Sluigi E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), l); 196227614Sluigi } 197228276Sluigi 198228276Sluigi if (n == 0 || kring->nr_hwavail < 1) { 199228276Sluigi int delta; 200228276Sluigi 201228276Sluigi /* record completed transmissions using TDH */ 202228276Sluigi l = E1000_READ_REG(&adapter->hw, E1000_TDH(0)); 203231778Sluigi if (l >= kring->nkr_num_slots) { /* XXX can it happen ? */ 204228276Sluigi D("bad TDH %d", l); 205228276Sluigi l -= kring->nkr_num_slots; 206228276Sluigi } 207228276Sluigi delta = l - adapter->next_tx_to_clean; 208228276Sluigi if (delta) { 209232238Sluigi /* some tx completed, increment hwavail. */ 210228276Sluigi if (delta < 0) 211228276Sluigi delta += kring->nkr_num_slots; 212228276Sluigi adapter->next_tx_to_clean = l; 213228276Sluigi kring->nr_hwavail += delta; 214228276Sluigi } 215228276Sluigi } 216232238Sluigi /* update avail to what the kernel knows */ 217231778Sluigi ring->avail = kring->nr_hwavail; 218231198Sluigi 219227614Sluigi if (do_lock) 220227614Sluigi EM_TX_UNLOCK(adapter); 221227614Sluigi return 0; 222227614Sluigi} 223227614Sluigi 224227614Sluigi 225227614Sluigi/* 226228276Sluigi * Reconcile kernel and user view of the receive ring. 227227614Sluigi */ 228227614Sluigistatic int 229231594Sluigilem_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock) 230227614Sluigi{ 231231594Sluigi struct adapter *adapter = ifp->if_softc; 232232238Sluigi struct netmap_adapter *na = NA(ifp); 233231796Sluigi struct netmap_kring *kring = &na->rx_rings[ring_nr]; 234227614Sluigi struct netmap_ring *ring = kring->ring; 235232238Sluigi int j, l, n, lim = kring->nkr_num_slots - 1; 236232238Sluigi int force_update = do_lock || kring->nr_kflags & NKR_PENDINTR; 237232238Sluigi u_int k = ring->cur, resvd = ring->reserved; 238227614Sluigi 239228276Sluigi if (k > lim) 240227614Sluigi return netmap_ring_reinit(kring); 241227614Sluigi 242227614Sluigi if (do_lock) 243227614Sluigi EM_RX_LOCK(adapter); 244231778Sluigi 245227614Sluigi /* XXX check sync modes */ 246227614Sluigi bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map, 247227614Sluigi BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 248227614Sluigi 249232238Sluigi /* 250232238Sluigi * Import newly received packets into the netmap ring. 251232238Sluigi * j is an index in the netmap ring, l in the NIC ring. 252231778Sluigi */ 253231778Sluigi l = adapter->next_rx_desc_to_check; 254232238Sluigi j = netmap_idx_n2k(kring, l); 255232238Sluigi if (netmap_no_pendintr || force_update) { 256232238Sluigi for (n = 0; ; n++) { 257232238Sluigi struct e1000_rx_desc *curr = &adapter->rx_desc_base[l]; 258232238Sluigi uint32_t staterr = le32toh(curr->status); 259232238Sluigi int len; 260227614Sluigi 261232238Sluigi if ((staterr & E1000_RXD_STAT_DD) == 0) 262232238Sluigi break; 263232238Sluigi len = le16toh(curr->length) - 4; // CRC 264232238Sluigi if (len < 0) { 265232238Sluigi D("bogus pkt size at %d", j); 266232238Sluigi len = 0; 267232238Sluigi } 268232238Sluigi ring->slot[j].len = len; 269232238Sluigi bus_dmamap_sync(adapter->rxtag, 270232238Sluigi adapter->rx_buffer_area[l].map, 271232238Sluigi BUS_DMASYNC_POSTREAD); 272232238Sluigi j = (j == lim) ? 0 : j + 1; 273232238Sluigi l = (l == lim) ? 0 : l + 1; 274227614Sluigi } 275232238Sluigi if (n) { /* update the state variables */ 276232238Sluigi adapter->next_rx_desc_to_check = l; 277232238Sluigi kring->nr_hwavail += n; 278232238Sluigi } 279232238Sluigi kring->nr_kflags &= ~NKR_PENDINTR; 280227614Sluigi } 281227614Sluigi 282232238Sluigi /* skip past packets that userspace has released */ 283231796Sluigi j = kring->nr_hwcur; /* netmap ring index */ 284232238Sluigi if (resvd > 0) { 285232238Sluigi if (resvd + ring->avail >= lim + 1) { 286232238Sluigi D("XXX invalid reserve/avail %d %d", resvd, ring->avail); 287232238Sluigi ring->reserved = resvd = 0; // XXX panic... 288232238Sluigi } 289232238Sluigi k = (k >= resvd) ? k - resvd : k + lim + 1 - resvd; 290232238Sluigi } 291232238Sluigi if (j != k) { /* userspace has released some packets. */ 292232238Sluigi l = netmap_idx_k2n(kring, j); /* NIC ring index */ 293231881Sluigi for (n = 0; j != k; n++) { 294227614Sluigi struct netmap_slot *slot = &ring->slot[j]; 295228276Sluigi struct e1000_rx_desc *curr = &adapter->rx_desc_base[l]; 296228276Sluigi struct em_buffer *rxbuf = &adapter->rx_buffer_area[l]; 297229939Sluigi uint64_t paddr; 298229939Sluigi void *addr = PNMB(slot, &paddr); 299227614Sluigi 300227614Sluigi if (addr == netmap_buffer_base) { /* bad buf */ 301227614Sluigi if (do_lock) 302227614Sluigi EM_RX_UNLOCK(adapter); 303227614Sluigi return netmap_ring_reinit(kring); 304227614Sluigi } 305231778Sluigi 306227614Sluigi if (slot->flags & NS_BUF_CHANGED) { 307231796Sluigi /* buffer has changed, reload map */ 308229939Sluigi netmap_reload_map(adapter->rxtag, rxbuf->map, addr); 309232238Sluigi curr->buffer_addr = htole64(paddr); 310227614Sluigi slot->flags &= ~NS_BUF_CHANGED; 311227614Sluigi } 312232238Sluigi curr->status = 0; 313227614Sluigi 314227614Sluigi bus_dmamap_sync(adapter->rxtag, rxbuf->map, 315228276Sluigi BUS_DMASYNC_PREREAD); 316227614Sluigi 317227614Sluigi j = (j == lim) ? 0 : j + 1; 318228276Sluigi l = (l == lim) ? 0 : l + 1; 319227614Sluigi } 320227614Sluigi kring->nr_hwavail -= n; 321228276Sluigi kring->nr_hwcur = k; 322227614Sluigi bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map, 323228276Sluigi BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 324227614Sluigi /* 325227614Sluigi * IMPORTANT: we must leave one free slot in the ring, 326228276Sluigi * so move l back by one unit 327227614Sluigi */ 328228276Sluigi l = (l == 0) ? lim : l - 1; 329228276Sluigi E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), l); 330227614Sluigi } 331227614Sluigi /* tell userspace that there are new packets */ 332232238Sluigi ring->avail = kring->nr_hwavail - resvd; 333227614Sluigi if (do_lock) 334227614Sluigi EM_RX_UNLOCK(adapter); 335227614Sluigi return 0; 336227614Sluigi} 337232238Sluigi 338232238Sluigi 339232238Sluigistatic void 340232238Sluigilem_netmap_attach(struct adapter *adapter) 341232238Sluigi{ 342232238Sluigi struct netmap_adapter na; 343232238Sluigi 344232238Sluigi bzero(&na, sizeof(na)); 345232238Sluigi 346232238Sluigi na.ifp = adapter->ifp; 347232238Sluigi na.separate_locks = 1; 348232238Sluigi na.num_tx_desc = adapter->num_tx_desc; 349232238Sluigi na.num_rx_desc = adapter->num_rx_desc; 350232238Sluigi na.nm_txsync = lem_netmap_txsync; 351232238Sluigi na.nm_rxsync = lem_netmap_rxsync; 352232238Sluigi na.nm_lock = lem_netmap_lock_wrapper; 353232238Sluigi na.nm_register = lem_netmap_reg; 354232238Sluigi netmap_attach(&na, 1); 355232238Sluigi} 356232238Sluigi 357231198Sluigi/* end of file */ 358