e330262f34
Reviewed by: vmaffione, zlei Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D37814
375 lines
11 KiB
C
375 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*
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* netmap support for: re
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*
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* For more details on netmap support please see ixgbe_netmap.h
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*/
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#include <net/netmap.h>
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#include <sys/selinfo.h>
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#include <vm/vm.h>
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#include <vm/pmap.h> /* vtophys ? */
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#include <dev/netmap/netmap_kern.h>
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/*
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* Register/unregister. We are already under netmap lock.
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*/
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static int
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re_netmap_reg(struct netmap_adapter *na, int onoff)
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{
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if_t ifp = na->ifp;
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struct rl_softc *adapter = if_getsoftc(ifp);
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RL_LOCK(adapter);
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re_stop(adapter); /* also clears IFF_DRV_RUNNING */
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if (onoff) {
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nm_set_native_flags(na);
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} else {
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nm_clear_native_flags(na);
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}
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re_init_locked(adapter); /* also enables intr */
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RL_UNLOCK(adapter);
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return (if_getdrvflags(ifp) & IFF_DRV_RUNNING ? 0 : 1);
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}
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/*
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* Reconcile kernel and user view of the transmit ring.
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*/
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static int
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re_netmap_txsync(struct netmap_kring *kring, int flags)
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{
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struct netmap_adapter *na = kring->na;
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if_t ifp = na->ifp;
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struct netmap_ring *ring = kring->ring;
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u_int nm_i; /* index into the netmap ring */
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u_int nic_i; /* index into the NIC ring */
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u_int n;
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u_int const lim = kring->nkr_num_slots - 1;
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u_int const head = kring->rhead;
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/* device-specific */
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struct rl_softc *sc = if_getsoftc(ifp);
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struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
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bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
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sc->rl_ldata.rl_tx_list_map,
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BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ?
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/*
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* First part: process new packets to send.
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*/
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nm_i = kring->nr_hwcur;
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if (nm_i != head) { /* we have new packets to send */
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nic_i = sc->rl_ldata.rl_tx_prodidx;
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// XXX or netmap_idx_k2n(kring, nm_i);
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for (n = 0; nm_i != head; n++) {
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struct netmap_slot *slot = &ring->slot[nm_i];
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u_int len = slot->len;
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uint64_t paddr;
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void *addr = PNMB(na, slot, &paddr);
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/* device-specific */
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struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i];
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int cmd = slot->len | RL_TDESC_CMD_EOF |
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RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
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NM_CHECK_ADDR_LEN(na, addr, len);
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if (nic_i == lim) /* mark end of ring */
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cmd |= RL_TDESC_CMD_EOR;
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if (slot->flags & NS_BUF_CHANGED) {
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/* buffer has changed, reload map */
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desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
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desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
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netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag,
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txd[nic_i].tx_dmamap, addr);
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}
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slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
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/* Fill the slot in the NIC ring. */
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desc->rl_cmdstat = htole32(cmd);
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/* make sure changes to the buffer are synced */
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bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
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txd[nic_i].tx_dmamap,
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BUS_DMASYNC_PREWRITE);
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nm_i = nm_next(nm_i, lim);
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nic_i = nm_next(nic_i, lim);
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}
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sc->rl_ldata.rl_tx_prodidx = nic_i;
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kring->nr_hwcur = head;
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/* synchronize the NIC ring */
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bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
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sc->rl_ldata.rl_tx_list_map,
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BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
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/* start ? */
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CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
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}
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/*
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* Second part: reclaim buffers for completed transmissions.
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*/
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if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
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nic_i = sc->rl_ldata.rl_tx_considx;
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for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx;
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n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) {
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uint32_t cmdstat =
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le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat);
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if (cmdstat & RL_TDESC_STAT_OWN)
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break;
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}
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if (n > 0) {
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sc->rl_ldata.rl_tx_considx = nic_i;
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sc->rl_ldata.rl_tx_free += n;
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kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
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}
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}
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return 0;
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}
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/*
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* Reconcile kernel and user view of the receive ring.
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*/
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static int
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re_netmap_rxsync(struct netmap_kring *kring, int flags)
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{
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struct netmap_adapter *na = kring->na;
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if_t ifp = na->ifp;
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struct netmap_ring *ring = kring->ring;
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u_int nm_i; /* index into the netmap ring */
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u_int nic_i; /* index into the NIC ring */
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u_int const lim = kring->nkr_num_slots - 1;
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u_int const head = kring->rhead;
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int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
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/* device-specific */
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struct rl_softc *sc = if_getsoftc(ifp);
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struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
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if (head > lim)
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return netmap_ring_reinit(kring);
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bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
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sc->rl_ldata.rl_rx_list_map,
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BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
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/*
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* First part: import newly received packets.
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*
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* This device uses all the buffers in the ring, so we need
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* another termination condition in addition to RL_RDESC_STAT_OWN
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* cleared (all buffers could have it cleared). The easiest one
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* is to stop right before nm_hwcur.
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*/
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if (netmap_no_pendintr || force_update) {
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uint32_t stop_i = nm_prev(kring->nr_hwcur, lim);
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nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
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nm_i = netmap_idx_n2k(kring, nic_i);
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while (nm_i != stop_i) {
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struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i];
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uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
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uint32_t total_len;
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if ((rxstat & RL_RDESC_STAT_OWN) != 0)
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break;
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total_len = rxstat & sc->rl_rxlenmask;
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/* XXX subtract crc */
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total_len = (total_len < 4) ? 0 : total_len - 4;
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ring->slot[nm_i].len = total_len;
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ring->slot[nm_i].flags = 0;
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/* sync was in re_newbuf() */
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bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
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rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD);
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// if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1);
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nm_i = nm_next(nm_i, lim);
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nic_i = nm_next(nic_i, lim);
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}
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sc->rl_ldata.rl_rx_prodidx = nic_i;
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kring->nr_hwtail = nm_i;
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kring->nr_kflags &= ~NKR_PENDINTR;
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}
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/*
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* Second part: skip past packets that userspace has released.
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*/
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nm_i = kring->nr_hwcur;
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if (nm_i != head) {
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nic_i = netmap_idx_k2n(kring, nm_i);
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while (nm_i != head) {
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struct netmap_slot *slot = &ring->slot[nm_i];
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uint64_t paddr;
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void *addr = PNMB(na, slot, &paddr);
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struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i];
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int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN;
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if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
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goto ring_reset;
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if (nic_i == lim) /* mark end of ring */
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cmd |= RL_RDESC_CMD_EOR;
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if (slot->flags & NS_BUF_CHANGED) {
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/* buffer has changed, reload map */
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desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
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desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
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netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
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rxd[nic_i].rx_dmamap, addr);
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slot->flags &= ~NS_BUF_CHANGED;
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}
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desc->rl_cmdstat = htole32(cmd);
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bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
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rxd[nic_i].rx_dmamap,
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BUS_DMASYNC_PREREAD);
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nm_i = nm_next(nm_i, lim);
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nic_i = nm_next(nic_i, lim);
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}
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kring->nr_hwcur = head;
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bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
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sc->rl_ldata.rl_rx_list_map,
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BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
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}
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return 0;
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ring_reset:
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return netmap_ring_reinit(kring);
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}
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/*
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* Additional routines to init the tx and rx rings.
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* In other drivers we do that inline in the main code.
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*/
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static void
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re_netmap_tx_init(struct rl_softc *sc)
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{
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struct rl_txdesc *txd;
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struct rl_desc *desc;
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int i, n;
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struct netmap_adapter *na = NA(sc->rl_ifp);
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struct netmap_slot *slot;
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slot = netmap_reset(na, NR_TX, 0, 0);
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/* slot is NULL if we are not in native netmap mode */
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if (!slot)
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return;
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/* in netmap mode, overwrite addresses and maps */
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txd = sc->rl_ldata.rl_tx_desc;
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desc = sc->rl_ldata.rl_tx_list;
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n = sc->rl_ldata.rl_tx_desc_cnt;
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/* l points in the netmap ring, i points in the NIC ring */
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for (i = 0; i < n; i++) {
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uint64_t paddr;
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int l = netmap_idx_n2k(na->tx_rings[0], i);
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void *addr = PNMB(na, slot + l, &paddr);
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desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
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desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
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netmap_load_map(na, sc->rl_ldata.rl_tx_mtag,
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txd[i].tx_dmamap, addr);
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}
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}
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static void
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re_netmap_rx_init(struct rl_softc *sc)
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{
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struct netmap_adapter *na = NA(sc->rl_ifp);
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struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
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struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
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uint32_t cmdstat;
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uint32_t nic_i, max_avail;
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uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt;
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if (!slot)
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return;
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/*
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* Do not release the slots owned by userspace,
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* and also keep one empty.
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*/
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max_avail = n - 1 - nm_kr_rxspace(na->rx_rings[0]);
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for (nic_i = 0; nic_i < n; nic_i++) {
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void *addr;
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uint64_t paddr;
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uint32_t nm_i = netmap_idx_n2k(na->rx_rings[0], nic_i);
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addr = PNMB(na, slot + nm_i, &paddr);
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netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
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sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr);
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bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
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sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD);
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desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
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desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
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cmdstat = NETMAP_BUF_SIZE(na);
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if (nic_i == n - 1) /* mark the end of ring */
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cmdstat |= RL_RDESC_CMD_EOR;
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if (nic_i < max_avail)
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cmdstat |= RL_RDESC_CMD_OWN;
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desc[nic_i].rl_cmdstat = htole32(cmdstat);
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}
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}
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static void
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re_netmap_attach(struct rl_softc *sc)
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{
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struct netmap_adapter na;
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bzero(&na, sizeof(na));
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na.ifp = sc->rl_ifp;
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na.na_flags = NAF_BDG_MAYSLEEP;
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na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
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na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
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na.nm_txsync = re_netmap_txsync;
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na.nm_rxsync = re_netmap_rxsync;
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na.nm_register = re_netmap_reg;
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na.num_tx_rings = na.num_rx_rings = 1;
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netmap_attach(&na);
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}
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/* end of file */
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