Current Path : /sys/dev/netmap/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/dev/netmap/if_em_netmap.h |
/* * Copyright (C) 2011 Matteo Landi, Luigi Rizzo. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * $FreeBSD: release/9.1.0/sys/dev/netmap/if_em_netmap.h 235549 2012-05-17 15:02:51Z luigi $ * $Id: if_em_netmap.h 10627 2012-02-23 19:37:15Z luigi $ * * netmap support for em. * * For more details on netmap support please see ixgbe_netmap.h */ #include <net/netmap.h> #include <sys/selinfo.h> #include <vm/vm.h> #include <vm/pmap.h> /* vtophys ? */ #include <dev/netmap/netmap_kern.h> static void em_netmap_block_tasks(struct adapter *); static void em_netmap_unblock_tasks(struct adapter *); static void em_netmap_lock_wrapper(struct ifnet *ifp, int what, u_int queueid) { struct adapter *adapter = ifp->if_softc; ASSERT(queueid < adapter->num_queues); switch (what) { case NETMAP_CORE_LOCK: EM_CORE_LOCK(adapter); break; case NETMAP_CORE_UNLOCK: EM_CORE_UNLOCK(adapter); break; case NETMAP_TX_LOCK: EM_TX_LOCK(&adapter->tx_rings[queueid]); break; case NETMAP_TX_UNLOCK: EM_TX_UNLOCK(&adapter->tx_rings[queueid]); break; case NETMAP_RX_LOCK: EM_RX_LOCK(&adapter->rx_rings[queueid]); break; case NETMAP_RX_UNLOCK: EM_RX_UNLOCK(&adapter->rx_rings[queueid]); break; } } // XXX do we need to block/unblock the tasks ? static void em_netmap_block_tasks(struct adapter *adapter) { if (adapter->msix > 1) { /* MSIX */ int i; struct tx_ring *txr = adapter->tx_rings; struct rx_ring *rxr = adapter->rx_rings; for (i = 0; i < adapter->num_queues; i++, txr++, rxr++) { taskqueue_block(txr->tq); taskqueue_drain(txr->tq, &txr->tx_task); taskqueue_block(rxr->tq); taskqueue_drain(rxr->tq, &rxr->rx_task); } } else { /* legacy */ taskqueue_block(adapter->tq); taskqueue_drain(adapter->tq, &adapter->link_task); taskqueue_drain(adapter->tq, &adapter->que_task); } } static void em_netmap_unblock_tasks(struct adapter *adapter) { if (adapter->msix > 1) { struct tx_ring *txr = adapter->tx_rings; struct rx_ring *rxr = adapter->rx_rings; int i; for (i = 0; i < adapter->num_queues; i++) { taskqueue_unblock(txr->tq); taskqueue_unblock(rxr->tq); } } else { /* legacy */ taskqueue_unblock(adapter->tq); } } /* * Register/unregister routine */ static int em_netmap_reg(struct ifnet *ifp, int onoff) { struct adapter *adapter = ifp->if_softc; struct netmap_adapter *na = NA(ifp); int error = 0; if (na == NULL) return EINVAL; /* no netmap support here */ em_disable_intr(adapter); /* Tell the stack that the interface is no longer active */ ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); em_netmap_block_tasks(adapter); if (onoff) { ifp->if_capenable |= IFCAP_NETMAP; na->if_transmit = ifp->if_transmit; ifp->if_transmit = netmap_start; em_init_locked(adapter); if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) == 0) { error = ENOMEM; goto fail; } } else { fail: /* return to non-netmap mode */ ifp->if_transmit = na->if_transmit; ifp->if_capenable &= ~IFCAP_NETMAP; em_init_locked(adapter); /* also enable intr */ } em_netmap_unblock_tasks(adapter); return (error); } /* * Reconcile kernel and user view of the transmit ring. */ static int em_netmap_txsync(struct ifnet *ifp, u_int ring_nr, int do_lock) { struct adapter *adapter = ifp->if_softc; struct tx_ring *txr = &adapter->tx_rings[ring_nr]; struct netmap_adapter *na = NA(ifp); struct netmap_kring *kring = &na->tx_rings[ring_nr]; struct netmap_ring *ring = kring->ring; u_int j, k, l, n = 0, lim = kring->nkr_num_slots - 1; /* generate an interrupt approximately every half ring */ int report_frequency = kring->nkr_num_slots >> 1; k = ring->cur; if (k > lim) return netmap_ring_reinit(kring); if (do_lock) EM_TX_LOCK(txr); bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, BUS_DMASYNC_POSTREAD); /* * Process new packets to send. j is the current index in the * netmap ring, l is the corresponding index in the NIC ring. */ j = kring->nr_hwcur; if (j != k) { /* we have new packets to send */ l = netmap_idx_k2n(kring, j); for (n = 0; j != k; n++) { /* slot is the current slot in the netmap ring */ struct netmap_slot *slot = &ring->slot[j]; /* curr is the current slot in the nic ring */ struct e1000_tx_desc *curr = &txr->tx_base[l]; struct em_buffer *txbuf = &txr->tx_buffers[l]; int flags = ((slot->flags & NS_REPORT) || j == 0 || j == report_frequency) ? E1000_TXD_CMD_RS : 0; uint64_t paddr; void *addr = PNMB(slot, &paddr); u_int len = slot->len; if (addr == netmap_buffer_base || len > NETMAP_BUF_SIZE) { if (do_lock) EM_TX_UNLOCK(txr); return netmap_ring_reinit(kring); } slot->flags &= ~NS_REPORT; if (slot->flags & NS_BUF_CHANGED) { curr->buffer_addr = htole64(paddr); /* buffer has changed, reload map */ netmap_reload_map(txr->txtag, txbuf->map, addr); slot->flags &= ~NS_BUF_CHANGED; } curr->upper.data = 0; curr->lower.data = htole32(adapter->txd_cmd | len | (E1000_TXD_CMD_EOP | flags) ); bus_dmamap_sync(txr->txtag, txbuf->map, BUS_DMASYNC_PREWRITE); j = (j == lim) ? 0 : j + 1; l = (l == lim) ? 0 : l + 1; } kring->nr_hwcur = k; /* the saved ring->cur */ kring->nr_hwavail -= n; bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), l); } if (n == 0 || kring->nr_hwavail < 1) { int delta; /* record completed transmissions using TDH */ l = E1000_READ_REG(&adapter->hw, E1000_TDH(ring_nr)); if (l >= kring->nkr_num_slots) { /* XXX can it happen ? */ D("TDH wrap %d", l); l -= kring->nkr_num_slots; } delta = l - txr->next_to_clean; if (delta) { /* some completed, increment hwavail. */ if (delta < 0) delta += kring->nkr_num_slots; txr->next_to_clean = l; kring->nr_hwavail += delta; } } /* update avail to what the kernel knows */ ring->avail = kring->nr_hwavail; if (do_lock) EM_TX_UNLOCK(txr); return 0; } /* * Reconcile kernel and user view of the receive ring. */ static int em_netmap_rxsync(struct ifnet *ifp, u_int ring_nr, int do_lock) { struct adapter *adapter = ifp->if_softc; struct rx_ring *rxr = &adapter->rx_rings[ring_nr]; struct netmap_adapter *na = NA(ifp); struct netmap_kring *kring = &na->rx_rings[ring_nr]; struct netmap_ring *ring = kring->ring; u_int j, l, n, lim = kring->nkr_num_slots - 1; int force_update = do_lock || kring->nr_kflags & NKR_PENDINTR; u_int k = ring->cur, resvd = ring->reserved; k = ring->cur; if (k > lim) return netmap_ring_reinit(kring); if (do_lock) EM_RX_LOCK(rxr); /* XXX check sync modes */ bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); /* * Import newly received packets into the netmap ring. * j is an index in the netmap ring, l in the NIC ring. */ l = rxr->next_to_check; j = netmap_idx_n2k(kring, l); if (netmap_no_pendintr || force_update) { for (n = 0; ; n++) { struct e1000_rx_desc *curr = &rxr->rx_base[l]; uint32_t staterr = le32toh(curr->status); if ((staterr & E1000_RXD_STAT_DD) == 0) break; ring->slot[j].len = le16toh(curr->length); bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[l].map, BUS_DMASYNC_POSTREAD); j = (j == lim) ? 0 : j + 1; /* make sure next_to_refresh follows next_to_check */ rxr->next_to_refresh = l; // XXX l = (l == lim) ? 0 : l + 1; } if (n) { /* update the state variables */ rxr->next_to_check = l; kring->nr_hwavail += n; } kring->nr_kflags &= ~NKR_PENDINTR; } /* skip past packets that userspace has released */ j = kring->nr_hwcur; /* netmap ring index */ if (resvd > 0) { if (resvd + ring->avail >= lim + 1) { D("XXX invalid reserve/avail %d %d", resvd, ring->avail); ring->reserved = resvd = 0; // XXX panic... } k = (k >= resvd) ? k - resvd : k + lim + 1 - resvd; } if (j != k) { /* userspace has released some packets. */ l = netmap_idx_k2n(kring, j); /* NIC ring index */ for (n = 0; j != k; n++) { struct netmap_slot *slot = &ring->slot[j]; struct e1000_rx_desc *curr = &rxr->rx_base[l]; struct em_buffer *rxbuf = &rxr->rx_buffers[l]; uint64_t paddr; void *addr = PNMB(slot, &paddr); if (addr == netmap_buffer_base) { /* bad buf */ if (do_lock) EM_RX_UNLOCK(rxr); return netmap_ring_reinit(kring); } if (slot->flags & NS_BUF_CHANGED) { curr->buffer_addr = htole64(paddr); /* buffer has changed, reload map */ netmap_reload_map(rxr->rxtag, rxbuf->map, addr); slot->flags &= ~NS_BUF_CHANGED; } curr->status = 0; bus_dmamap_sync(rxr->rxtag, rxbuf->map, BUS_DMASYNC_PREREAD); j = (j == lim) ? 0 : j + 1; l = (l == lim) ? 0 : l + 1; } kring->nr_hwavail -= n; kring->nr_hwcur = k; bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); /* * IMPORTANT: we must leave one free slot in the ring, * so move l back by one unit */ l = (l == 0) ? lim : l - 1; E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), l); } /* tell userspace that there are new packets */ ring->avail = kring->nr_hwavail - resvd; if (do_lock) EM_RX_UNLOCK(rxr); return 0; } static void em_netmap_attach(struct adapter *adapter) { struct netmap_adapter na; bzero(&na, sizeof(na)); na.ifp = adapter->ifp; na.separate_locks = 1; na.num_tx_desc = adapter->num_tx_desc; na.num_rx_desc = adapter->num_rx_desc; na.nm_txsync = em_netmap_txsync; na.nm_rxsync = em_netmap_rxsync; na.nm_lock = em_netmap_lock_wrapper; na.nm_register = em_netmap_reg; netmap_attach(&na, adapter->num_queues); } /* end of file */