Date: Wed, 14 Nov 2018 15:39:49 +0000 (UTC) From: Vincenzo Maffione <vmaffione@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340436 - in head/sys/dev: netmap virtio/network Message-ID: <201811141539.wAEFdnKQ077428@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: vmaffione Date: Wed Nov 14 15:39:48 2018 New Revision: 340436 URL: https://svnweb.freebsd.org/changeset/base/340436 Log: vtnet: fix netmap support netmap(4) support for vtnet(4) was incomplete and had multiple bugs. This commit fixes those bugs to bring netmap on vtnet in a functional state. Changelist: - handle errors returned by virtqueue_enqueue() properly (they were previously ignored) - make sure netmap XOR rest of the kernel access each virtqueue. - compute the number of netmap slots for TX and RX separately, according to whether indirect descriptors are used or not for a given virtqueue. - make sure sglist are freed according to their type (mbufs or netmap buffers) - add support for mulitiqueue and netmap host (aka sw) rings. - intercept VQ interrupts directly instead of intercepting them in txq_eof and rxq_eof. This simplifies the code and makes it easier to make sure taskqueues are not running for a VQ while it is in netmap mode. - implement vntet_netmap_config() to cope with changes in the number of queues. Reviewed by: bryanv Approved by: gnn (mentor) MFC after: 3 days Sponsored by: Sunny Valley Networks Differential Revision: https://reviews.freebsd.org/D17916 Modified: head/sys/dev/netmap/if_vtnet_netmap.h head/sys/dev/virtio/network/if_vtnet.c head/sys/dev/virtio/network/if_vtnetvar.h Modified: head/sys/dev/netmap/if_vtnet_netmap.h ============================================================================== --- head/sys/dev/netmap/if_vtnet_netmap.h Wed Nov 14 15:23:39 2018 (r340435) +++ head/sys/dev/netmap/if_vtnet_netmap.h Wed Nov 14 15:39:48 2018 (r340436) @@ -1,5 +1,5 @@ /* - * Copyright (C) 2014 Vincenzo Maffione, Luigi Rizzo. All rights reserved. + * Copyright (C) 2014-2018 Vincenzo Maffione, Luigi Rizzo. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -33,74 +33,148 @@ #include <vm/pmap.h> /* vtophys ? */ #include <dev/netmap/netmap_kern.h> +/* + * Return 1 if the queue identified by 't' and 'idx' is in netmap mode. + */ +static int +vtnet_netmap_queue_on(struct vtnet_softc *sc, enum txrx t, int idx) +{ + struct netmap_adapter *na = NA(sc->vtnet_ifp); -#define SOFTC_T vtnet_softc + if (!nm_native_on(na)) + return 0; -/* Free all the unused buffer in all the RX virtqueues. - * This function is called when entering and exiting netmap mode. - * - buffers queued by the virtio driver return skbuf/mbuf pointer - * and need to be freed; - * - buffers queued by netmap return the txq/rxq, and do not need work - */ + if (t == NR_RX) + return !!(idx < na->num_rx_rings && + na->rx_rings[idx]->nr_mode == NKR_NETMAP_ON); + + return !!(idx < na->num_tx_rings && + na->tx_rings[idx]->nr_mode == NKR_NETMAP_ON); +} + static void -vtnet_netmap_free_bufs(struct SOFTC_T* sc) +vtnet_free_used(struct virtqueue *vq, int netmap_bufs, enum txrx t, int idx) { - int i, nmb = 0, n = 0, last; + void *cookie; + int deq = 0; - for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { - struct vtnet_rxq *rxq = &sc->vtnet_rxqs[i]; - struct virtqueue *vq; - struct mbuf *m; - struct vtnet_txq *txq = &sc->vtnet_txqs[i]; - struct vtnet_tx_header *txhdr; + while ((cookie = virtqueue_dequeue(vq, NULL)) != NULL) { + if (netmap_bufs) { + /* These are netmap buffers: there is nothing to do. */ + } else { + /* These are mbufs that we need to free. */ + struct mbuf *m; - last = 0; - vq = rxq->vtnrx_vq; - while ((m = virtqueue_drain(vq, &last)) != NULL) { - n++; - if (m != (void *)rxq) + if (t == NR_TX) { + struct vtnet_tx_header *txhdr = cookie; + m = txhdr->vth_mbuf; m_freem(m); - else - nmb++; - } - - last = 0; - vq = txq->vtntx_vq; - while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { - n++; - if (txhdr != (void *)txq) { - m_freem(txhdr->vth_mbuf); uma_zfree(vtnet_tx_header_zone, txhdr); - } else - nmb++; + } else { + m = cookie; + m_freem(m); + } } + deq++; } - D("freed %d mbufs, %d netmap bufs on %d queues", - n - nmb, nmb, i); + + if (deq) + nm_prinf("%d sgs dequeued from %s-%d (netmap=%d)\n", + deq, nm_txrx2str(t), idx, netmap_bufs); } /* Register and unregister. */ static int -vtnet_netmap_reg(struct netmap_adapter *na, int onoff) +vtnet_netmap_reg(struct netmap_adapter *na, int state) { - struct ifnet *ifp = na->ifp; - struct SOFTC_T *sc = ifp->if_softc; + struct ifnet *ifp = na->ifp; + struct vtnet_softc *sc = ifp->if_softc; + int success; + enum txrx t; + int i; + /* Drain the taskqueues to make sure that there are no worker threads + * accessing the virtqueues. */ + vtnet_drain_taskqueues(sc); + VTNET_CORE_LOCK(sc); - ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); - /* enable or disable flags and callbacks in na and ifp */ - if (onoff) { + + /* We need nm_netmap_on() to return true when called by + * vtnet_init_locked() below. */ + if (state) nm_set_native_flags(na); + + /* We need to trigger a device reset in order to unexpose guest buffers + * published to the host. */ + ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); + /* Get pending used buffers. The way they are freed depends on whether + * they are netmap buffer or they are mbufs. We can tell apart the two + * cases by looking at kring->nr_mode, before this is possibly updated + * in the loop below. */ + for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { + struct vtnet_txq *txq = &sc->vtnet_txqs[i]; + struct vtnet_rxq *rxq = &sc->vtnet_rxqs[i]; + struct netmap_kring *kring; + + VTNET_TXQ_LOCK(txq); + kring = NMR(na, NR_TX)[i]; + vtnet_free_used(txq->vtntx_vq, + kring->nr_mode == NKR_NETMAP_ON, NR_TX, i); + VTNET_TXQ_UNLOCK(txq); + + VTNET_RXQ_LOCK(rxq); + kring = NMR(na, NR_RX)[i]; + vtnet_free_used(rxq->vtnrx_vq, + kring->nr_mode == NKR_NETMAP_ON, NR_RX, i); + VTNET_RXQ_UNLOCK(rxq); + } + vtnet_init_locked(sc); + success = (ifp->if_drv_flags & IFF_DRV_RUNNING) ? 0 : ENXIO; + + if (state) { + for_rx_tx(t) { + /* Hardware rings. */ + for (i = 0; i < nma_get_nrings(na, t); i++) { + struct netmap_kring *kring = NMR(na, t)[i]; + + if (nm_kring_pending_on(kring)) + kring->nr_mode = NKR_NETMAP_ON; + } + + /* Host rings. */ + for (i = 0; i < nma_get_host_nrings(na, t); i++) { + struct netmap_kring *kring = + NMR(na, t)[nma_get_nrings(na, t) + i]; + + if (nm_kring_pending_on(kring)) + kring->nr_mode = NKR_NETMAP_ON; + } + } } else { nm_clear_native_flags(na); + for_rx_tx(t) { + /* Hardware rings. */ + for (i = 0; i < nma_get_nrings(na, t); i++) { + struct netmap_kring *kring = NMR(na, t)[i]; + + if (nm_kring_pending_off(kring)) + kring->nr_mode = NKR_NETMAP_OFF; + } + + /* Host rings. */ + for (i = 0; i < nma_get_host_nrings(na, t); i++) { + struct netmap_kring *kring = + NMR(na, t)[nma_get_nrings(na, t) + i]; + + if (nm_kring_pending_off(kring)) + kring->nr_mode = NKR_NETMAP_OFF; + } + } } - /* drain queues so netmap and native drivers - * do not interfere with each other - */ - vtnet_netmap_free_bufs(sc); - vtnet_init_locked(sc); /* also enable intr */ - VTNET_CORE_UNLOCK(sc); - return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); + + VTNET_CORE_UNLOCK(sc); + + return success; } @@ -109,20 +183,19 @@ static int vtnet_netmap_txsync(struct netmap_kring *kring, int flags) { struct netmap_adapter *na = kring->na; - struct ifnet *ifp = na->ifp; + struct ifnet *ifp = na->ifp; struct netmap_ring *ring = kring->ring; u_int ring_nr = kring->ring_id; u_int nm_i; /* index into the netmap ring */ - u_int nic_i; /* index into the NIC ring */ - u_int n; u_int const lim = kring->nkr_num_slots - 1; u_int const head = kring->rhead; /* device-specific */ - struct SOFTC_T *sc = ifp->if_softc; + struct vtnet_softc *sc = ifp->if_softc; struct vtnet_txq *txq = &sc->vtnet_txqs[ring_nr]; struct virtqueue *vq = txq->vtntx_vq; int interrupts = !(kring->nr_kflags & NKR_NOINTR); + u_int n; /* * First part: process new packets to send. @@ -133,15 +206,13 @@ vtnet_netmap_txsync(struct netmap_kring *kring, int fl if (nm_i != head) { /* we have new packets to send */ struct sglist *sg = txq->vtntx_sg; - nic_i = netmap_idx_k2n(kring, nm_i); - for (n = 0; nm_i != head; n++) { + for (; nm_i != head; nm_i = nm_next(nm_i, lim)) { /* we use an empty header here */ - static struct virtio_net_hdr_mrg_rxbuf hdr; struct netmap_slot *slot = &ring->slot[nm_i]; u_int len = slot->len; uint64_t paddr; void *addr = PNMB(na, slot, &paddr); - int err; + int err; NM_CHECK_ADDR_LEN(na, addr, len); @@ -150,88 +221,63 @@ vtnet_netmap_txsync(struct netmap_kring *kring, int fl * and kick the hypervisor (if necessary). */ sglist_reset(sg); // cheap - // if vtnet_hdr_size > 0 ... - err = sglist_append(sg, &hdr, sc->vtnet_hdr_size); - // XXX later, support multi segment - err = sglist_append_phys(sg, paddr, len); - /* use na as the cookie */ - err = virtqueue_enqueue(vq, txq, sg, sg->sg_nseg, 0); - if (unlikely(err < 0)) { - D("virtqueue_enqueue failed"); - break; - } - - nm_i = nm_next(nm_i, lim); - nic_i = nm_next(nic_i, lim); + err = sglist_append(sg, &txq->vtntx_shrhdr, sc->vtnet_hdr_size); + err |= sglist_append_phys(sg, paddr, len); + KASSERT(err == 0, ("%s: cannot append to sglist %d", + __func__, err)); + err = virtqueue_enqueue(vq, /*cookie=*/txq, sg, + /*readable=*/sg->sg_nseg, + /*writeable=*/0); + if (unlikely(err)) { + if (err != ENOSPC) + nm_prerr("virtqueue_enqueue(%s) failed: %d\n", + kring->name, err); + break; + } } - /* Update hwcur depending on where we stopped. */ - kring->nr_hwcur = nm_i; /* note we migth break early */ - /* No more free TX slots? Ask the hypervisor for notifications, - * possibly only when a considerable amount of work has been - * done. - */ - ND(3,"sent %d packets, hwcur %d", n, nm_i); - virtqueue_disable_intr(vq); virtqueue_notify(vq); - } else { - if (ring->head != ring->tail) - ND(5, "pure notify ? head %d tail %d nused %d %d", - ring->head, ring->tail, virtqueue_nused(vq), - (virtqueue_dump(vq), 1)); - virtqueue_notify(vq); - if (interrupts) { - virtqueue_enable_intr(vq); // like postpone with 0 - } + + /* Update hwcur depending on where we stopped. */ + kring->nr_hwcur = nm_i; /* note we migth break early */ } - - /* Free used slots. We only consider our own used buffers, recognized - * by the token we passed to virtqueue_add_outbuf. + /* Free used slots. We only consider our own used buffers, recognized + * by the token we passed to virtqueue_enqueue. */ - n = 0; - for (;;) { - struct vtnet_tx_header *txhdr = virtqueue_dequeue(vq, NULL); - if (txhdr == NULL) - break; - if (likely(txhdr == (void *)txq)) { - n++; - if (virtqueue_nused(vq) < 32) { // XXX slow release - break; - } - } else { /* leftover from previous transmission */ - m_freem(txhdr->vth_mbuf); - uma_zfree(vtnet_tx_header_zone, txhdr); - } - } - if (n) { + n = 0; + for (;;) { + void *token = virtqueue_dequeue(vq, NULL); + if (token == NULL) + break; + if (unlikely(token != (void *)txq)) + nm_prerr("BUG: TX token mismatch\n"); + else + n++; + } + if (n > 0) { kring->nr_hwtail += n; if (kring->nr_hwtail > lim) kring->nr_hwtail -= lim + 1; } - if (nm_i != kring->nr_hwtail /* && vtnet_txq_below_threshold(txq) == 0*/) { - ND(3, "disable intr, hwcur %d", nm_i); - virtqueue_disable_intr(vq); - } else if (interrupts) { - ND(3, "enable intr, hwcur %d", nm_i); - virtqueue_postpone_intr(vq, VQ_POSTPONE_SHORT); - } - return 0; + if (interrupts && virtqueue_nfree(vq) < 32) + virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG); + + return 0; } static int -vtnet_refill_rxq(struct netmap_kring *kring, u_int nm_i, u_int head) +vtnet_netmap_kring_refill(struct netmap_kring *kring, u_int nm_i, u_int head) { struct netmap_adapter *na = kring->na; - struct ifnet *ifp = na->ifp; + struct ifnet *ifp = na->ifp; struct netmap_ring *ring = kring->ring; u_int ring_nr = kring->ring_id; u_int const lim = kring->nkr_num_slots - 1; - u_int n; /* device-specific */ - struct SOFTC_T *sc = ifp->if_softc; + struct vtnet_softc *sc = ifp->if_softc; struct vtnet_rxq *rxq = &sc->vtnet_rxqs[ring_nr]; struct virtqueue *vq = rxq->vtnrx_vq; @@ -239,12 +285,11 @@ vtnet_refill_rxq(struct netmap_kring *kring, u_int nm_ struct sglist_seg ss[2]; struct sglist sg = { ss, 0, 0, 2 }; - for (n = 0; nm_i != head; n++) { - static struct virtio_net_hdr_mrg_rxbuf hdr; + for (; nm_i != head; nm_i = nm_next(nm_i, lim)) { struct netmap_slot *slot = &ring->slot[nm_i]; uint64_t paddr; void *addr = PNMB(na, slot, &paddr); - int err = 0; + int err; if (addr == NETMAP_BUF_BASE(na)) { /* bad buf */ if (netmap_ring_reinit(kring)) @@ -252,99 +297,134 @@ vtnet_refill_rxq(struct netmap_kring *kring, u_int nm_ } slot->flags &= ~NS_BUF_CHANGED; - sglist_reset(&sg); // cheap - err = sglist_append(&sg, &hdr, sc->vtnet_hdr_size); - err = sglist_append_phys(&sg, paddr, NETMAP_BUF_SIZE(na)); + sglist_reset(&sg); + err = sglist_append(&sg, &rxq->vtnrx_shrhdr, sc->vtnet_hdr_size); + err |= sglist_append_phys(&sg, paddr, NETMAP_BUF_SIZE(na)); + KASSERT(err == 0, ("%s: cannot append to sglist %d", + __func__, err)); /* writable for the host */ - err = virtqueue_enqueue(vq, rxq, &sg, 0, sg.sg_nseg); - if (err < 0) { - D("virtqueue_enqueue failed"); + err = virtqueue_enqueue(vq, /*cookie=*/rxq, &sg, + /*readable=*/0, /*writeable=*/sg.sg_nseg); + if (unlikely(err)) { + if (err != ENOSPC) + nm_prerr("virtqueue_enqueue(%s) failed: %d\n", + kring->name, err); break; } - nm_i = nm_next(nm_i, lim); } + return nm_i; } +/* + * Publish netmap buffers on a RX virtqueue. + * Returns -1 if this virtqueue is not being opened in netmap mode. + * If the virtqueue is being opened in netmap mode, return 0 on success and + * a positive error code on failure. + */ +static int +vtnet_netmap_rxq_populate(struct vtnet_rxq *rxq) +{ + struct netmap_adapter *na = NA(rxq->vtnrx_sc->vtnet_ifp); + struct netmap_kring *kring; + int error; + + if (!nm_native_on(na) || rxq->vtnrx_id >= na->num_rx_rings) + return -1; + + kring = na->rx_rings[rxq->vtnrx_id]; + if (!(nm_kring_pending_on(kring) || + kring->nr_pending_mode == NKR_NETMAP_ON)) + return -1; + + /* Expose all the RX netmap buffers. Note that the number of + * netmap slots in the RX ring matches the maximum number of + * 2-elements sglist that the RX virtqueue can accommodate. */ + error = vtnet_netmap_kring_refill(kring, 0, na->num_rx_desc); + virtqueue_notify(rxq->vtnrx_vq); + + return error < 0 ? ENXIO : 0; +} + /* Reconcile kernel and user view of the receive ring. */ static int vtnet_netmap_rxsync(struct netmap_kring *kring, int flags) { struct netmap_adapter *na = kring->na; - struct ifnet *ifp = na->ifp; + struct ifnet *ifp = na->ifp; struct netmap_ring *ring = kring->ring; u_int ring_nr = kring->ring_id; u_int nm_i; /* index into the netmap ring */ - // u_int nic_i; /* index into the NIC ring */ - u_int n; u_int const lim = kring->nkr_num_slots - 1; u_int const head = kring->rhead; - int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; + int force_update = (flags & NAF_FORCE_READ) || + (kring->nr_kflags & NKR_PENDINTR); int interrupts = !(kring->nr_kflags & NKR_NOINTR); /* device-specific */ - struct SOFTC_T *sc = ifp->if_softc; + struct vtnet_softc *sc = ifp->if_softc; struct vtnet_rxq *rxq = &sc->vtnet_rxqs[ring_nr]; struct virtqueue *vq = rxq->vtnrx_vq; - /* XXX netif_carrier_ok ? */ - - if (head > lim) - return netmap_ring_reinit(kring); - rmb(); /* * First part: import newly received packets. - * Only accept our - * own buffers (matching the token). We should only get - * matching buffers, because of vtnet_netmap_free_rx_unused_bufs() - * and vtnet_netmap_init_buffers(). + * Only accept our own buffers (matching the token). We should only get + * matching buffers. We may need to stop early to avoid hwtail to overrun + * hwcur. */ if (netmap_no_pendintr || force_update) { - struct netmap_adapter *token; + uint32_t hwtail_lim = nm_prev(kring->nr_hwcur, lim); + void *token; - nm_i = kring->nr_hwtail; - n = 0; - for (;;) { + vtnet_rxq_disable_intr(rxq); + + nm_i = kring->nr_hwtail; + while (nm_i != hwtail_lim) { int len; - token = virtqueue_dequeue(vq, &len); - if (token == NULL) - break; - if (likely(token == (void *)rxq)) { - ring->slot[nm_i].len = len; - ring->slot[nm_i].flags = 0; - nm_i = nm_next(nm_i, lim); - n++; - } else { - D("This should not happen"); - } + token = virtqueue_dequeue(vq, &len); + if (token == NULL) { + if (interrupts && vtnet_rxq_enable_intr(rxq)) { + vtnet_rxq_disable_intr(rxq); + continue; + } + break; + } + if (unlikely(token != (void *)rxq)) { + nm_prerr("BUG: RX token mismatch\n"); + } else { + /* Skip the virtio-net header. */ + len -= sc->vtnet_hdr_size; + if (unlikely(len < 0)) { + RD(1, "Truncated virtio-net-header, " + "missing %d bytes", -len); + len = 0; + } + ring->slot[nm_i].len = len; + ring->slot[nm_i].flags = 0; + nm_i = nm_next(nm_i, lim); + } } kring->nr_hwtail = nm_i; kring->nr_kflags &= ~NKR_PENDINTR; } - ND("[B] h %d c %d hwcur %d hwtail %d", - ring->head, ring->cur, kring->nr_hwcur, - kring->nr_hwtail); + ND("[B] h %d c %d hwcur %d hwtail %d", ring->head, ring->cur, + kring->nr_hwcur, kring->nr_hwtail); /* * Second part: skip past packets that userspace has released. */ nm_i = kring->nr_hwcur; /* netmap ring index */ if (nm_i != head) { - int err = vtnet_refill_rxq(kring, nm_i, head); - if (err < 0) - return 1; - kring->nr_hwcur = err; + int nm_j = vtnet_netmap_kring_refill(kring, nm_i, head); + if (nm_j < 0) + return nm_j; + kring->nr_hwcur = nm_j; virtqueue_notify(vq); - /* After draining the queue may need an intr from the hypervisor */ - if (interrupts) { - vtnet_rxq_enable_intr(rxq); - } } - ND("[C] h %d c %d t %d hwcur %d hwtail %d", - ring->head, ring->cur, ring->tail, - kring->nr_hwcur, kring->nr_hwtail); + ND("[C] h %d c %d t %d hwcur %d hwtail %d", ring->head, ring->cur, + ring->tail, kring->nr_hwcur, kring->nr_hwtail); return 0; } @@ -352,9 +432,9 @@ vtnet_netmap_rxsync(struct netmap_kring *kring, int fl /* Enable/disable interrupts on all virtqueues. */ static void -vtnet_netmap_intr(struct netmap_adapter *na, int onoff) +vtnet_netmap_intr(struct netmap_adapter *na, int state) { - struct SOFTC_T *sc = na->ifp->if_softc; + struct vtnet_softc *sc = na->ifp->if_softc; int i; for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { @@ -362,7 +442,7 @@ vtnet_netmap_intr(struct netmap_adapter *na, int onoff struct vtnet_txq *txq = &sc->vtnet_txqs[i]; struct virtqueue *txvq = txq->vtntx_vq; - if (onoff) { + if (state) { vtnet_rxq_enable_intr(rxq); virtqueue_enable_intr(txvq); } else { @@ -372,60 +452,88 @@ vtnet_netmap_intr(struct netmap_adapter *na, int onoff } } -/* Make RX virtqueues buffers pointing to netmap buffers. */ static int -vtnet_netmap_init_rx_buffers(struct SOFTC_T *sc) +vtnet_netmap_tx_slots(struct vtnet_softc *sc) { - struct ifnet *ifp = sc->vtnet_ifp; - struct netmap_adapter* na = NA(ifp); - unsigned int r; + int div; - if (!nm_native_on(na)) - return 0; - for (r = 0; r < na->num_rx_rings; r++) { - struct netmap_kring *kring = na->rx_rings[r]; - struct vtnet_rxq *rxq = &sc->vtnet_rxqs[r]; - struct virtqueue *vq = rxq->vtnrx_vq; - struct netmap_slot* slot; - int err = 0; + /* We need to prepend a virtio-net header to each netmap buffer to be + * transmitted, therefore calling virtqueue_enqueue() passing sglist + * with 2 elements. + * TX virtqueues use indirect descriptors if the feature was negotiated + * with the host, and if sc->vtnet_tx_nsegs > 1. With indirect + * descriptors, a single virtio descriptor is sufficient to reference + * each TX sglist. Without them, we need two separate virtio descriptors + * for each TX sglist. We therefore compute the number of netmap TX + * slots according to these assumptions. + */ + if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) && sc->vtnet_tx_nsegs > 1) + div = 1; + else + div = 2; - slot = netmap_reset(na, NR_RX, r, 0); - if (!slot) { - D("strange, null netmap ring %d", r); - return 0; - } - /* Add up to na>-num_rx_desc-1 buffers to this RX virtqueue. - * It's important to leave one virtqueue slot free, otherwise - * we can run into ring->cur/ring->tail wraparounds. - */ - err = vtnet_refill_rxq(kring, 0, na->num_rx_desc-1); - if (err < 0) - return 0; - virtqueue_notify(vq); - } + return virtqueue_size(sc->vtnet_txqs[0].vtntx_vq) / div; +} - return 1; +static int +vtnet_netmap_rx_slots(struct vtnet_softc *sc) +{ + int div; + + /* We need to prepend a virtio-net header to each netmap buffer to be + * received, therefore calling virtqueue_enqueue() passing sglist + * with 2 elements. + * RX virtqueues use indirect descriptors if the feature was negotiated + * with the host, and if sc->vtnet_rx_nsegs > 1. With indirect + * descriptors, a single virtio descriptor is sufficient to reference + * each RX sglist. Without them, we need two separate virtio descriptors + * for each RX sglist. We therefore compute the number of netmap RX + * slots according to these assumptions. + */ + if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) && sc->vtnet_rx_nsegs > 1) + div = 1; + else + div = 2; + + return virtqueue_size(sc->vtnet_rxqs[0].vtnrx_vq) / div; } +static int +vtnet_netmap_config(struct netmap_adapter *na, struct nm_config_info *info) +{ + struct vtnet_softc *sc = na->ifp->if_softc; + + info->num_tx_rings = sc->vtnet_act_vq_pairs; + info->num_rx_rings = sc->vtnet_act_vq_pairs; + info->num_tx_descs = vtnet_netmap_tx_slots(sc); + info->num_rx_descs = vtnet_netmap_rx_slots(sc); + info->rx_buf_maxsize = NETMAP_BUF_SIZE(na); + + return 0; +} + static void -vtnet_netmap_attach(struct SOFTC_T *sc) +vtnet_netmap_attach(struct vtnet_softc *sc) { struct netmap_adapter na; bzero(&na, sizeof(na)); na.ifp = sc->vtnet_ifp; - na.num_tx_desc = 1024;// sc->vtnet_rx_nmbufs; - na.num_rx_desc = 1024; // sc->vtnet_rx_nmbufs; + na.na_flags = 0; + na.num_tx_desc = vtnet_netmap_tx_slots(sc); + na.num_rx_desc = vtnet_netmap_rx_slots(sc); + na.num_tx_rings = na.num_rx_rings = sc->vtnet_max_vq_pairs; + na.rx_buf_maxsize = 0; na.nm_register = vtnet_netmap_reg; na.nm_txsync = vtnet_netmap_txsync; na.nm_rxsync = vtnet_netmap_rxsync; na.nm_intr = vtnet_netmap_intr; - na.num_tx_rings = na.num_rx_rings = sc->vtnet_max_vq_pairs; - D("max rings %d", sc->vtnet_max_vq_pairs); + na.nm_config = vtnet_netmap_config; + netmap_attach(&na); - D("virtio attached txq=%d, txd=%d rxq=%d, rxd=%d", + nm_prinf("vtnet attached txq=%d, txd=%d rxq=%d, rxd=%d\n", na.num_tx_rings, na.num_tx_desc, na.num_tx_rings, na.num_rx_desc); } Modified: head/sys/dev/virtio/network/if_vtnet.c ============================================================================== --- head/sys/dev/virtio/network/if_vtnet.c Wed Nov 14 15:23:39 2018 (r340435) +++ head/sys/dev/virtio/network/if_vtnet.c Wed Nov 14 15:39:48 2018 (r340436) @@ -1192,6 +1192,12 @@ vtnet_rxq_populate(struct vtnet_rxq *rxq) struct virtqueue *vq; int nbufs, error; +#ifdef DEV_NETMAP + error = vtnet_netmap_rxq_populate(rxq); + if (error >= 0) + return (error); +#endif /* DEV_NETMAP */ + vq = rxq->vtnrx_vq; error = ENOSPC; @@ -1221,12 +1227,20 @@ vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) struct virtqueue *vq; struct mbuf *m; int last; +#ifdef DEV_NETMAP + int netmap_bufs = vtnet_netmap_queue_on(rxq->vtnrx_sc, NR_RX, + rxq->vtnrx_id); +#else /* !DEV_NETMAP */ + int netmap_bufs = 0; +#endif /* !DEV_NETMAP */ vq = rxq->vtnrx_vq; last = 0; - while ((m = virtqueue_drain(vq, &last)) != NULL) - m_freem(m); + while ((m = virtqueue_drain(vq, &last)) != NULL) { + if (!netmap_bufs) + m_freem(m); + } KASSERT(virtqueue_empty(vq), ("%s: mbufs remaining in rx queue %p", __func__, rxq)); @@ -1772,12 +1786,6 @@ vtnet_rxq_eof(struct vtnet_rxq *rxq) VTNET_RXQ_LOCK_ASSERT(rxq); -#ifdef DEV_NETMAP - if (netmap_rx_irq(ifp, 0, &deq)) { - return (FALSE); - } -#endif /* DEV_NETMAP */ - while (count-- > 0) { m = virtqueue_dequeue(vq, &len); if (m == NULL) @@ -1871,6 +1879,11 @@ vtnet_rx_vq_intr(void *xrxq) return; } +#ifdef DEV_NETMAP + if (netmap_rx_irq(ifp, rxq->vtnrx_id, &more) != NM_IRQ_PASS) + return; +#endif /* DEV_NETMAP */ + VTNET_RXQ_LOCK(rxq); again: @@ -1971,13 +1984,21 @@ vtnet_txq_free_mbufs(struct vtnet_txq *txq) struct virtqueue *vq; struct vtnet_tx_header *txhdr; int last; +#ifdef DEV_NETMAP + int netmap_bufs = vtnet_netmap_queue_on(txq->vtntx_sc, NR_TX, + txq->vtntx_id); +#else /* !DEV_NETMAP */ + int netmap_bufs = 0; +#endif /* !DEV_NETMAP */ vq = txq->vtntx_vq; last = 0; while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { - m_freem(txhdr->vth_mbuf); - uma_zfree(vtnet_tx_header_zone, txhdr); + if (!netmap_bufs) { + m_freem(txhdr->vth_mbuf); + uma_zfree(vtnet_tx_header_zone, txhdr); + } } KASSERT(virtqueue_empty(vq), @@ -2465,13 +2486,6 @@ vtnet_txq_eof(struct vtnet_txq *txq) deq = 0; VTNET_TXQ_LOCK_ASSERT(txq); -#ifdef DEV_NETMAP - if (netmap_tx_irq(txq->vtntx_sc->vtnet_ifp, txq->vtntx_id)) { - virtqueue_disable_intr(vq); // XXX luigi - return 0; // XXX or 1 ? - } -#endif /* DEV_NETMAP */ - while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { m = txhdr->vth_mbuf; deq++; @@ -2513,6 +2527,11 @@ vtnet_tx_vq_intr(void *xtxq) return; } +#ifdef DEV_NETMAP + if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) + return; +#endif /* DEV_NETMAP */ + VTNET_TXQ_LOCK(txq); if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { @@ -2769,11 +2788,6 @@ vtnet_drain_rxtx_queues(struct vtnet_softc *sc) struct vtnet_txq *txq; int i; -#ifdef DEV_NETMAP - if (nm_native_on(NA(sc->vtnet_ifp))) - return; -#endif /* DEV_NETMAP */ - for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { rxq = &sc->vtnet_rxqs[i]; vtnet_rxq_free_mbufs(rxq); @@ -2938,11 +2952,6 @@ vtnet_init_rx_queues(struct vtnet_softc *sc) ("%s: too many rx mbufs %d for %d segments", __func__, sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); -#ifdef DEV_NETMAP - if (vtnet_netmap_init_rx_buffers(sc)) - return 0; -#endif /* DEV_NETMAP */ - for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { rxq = &sc->vtnet_rxqs[i]; @@ -3092,13 +3101,6 @@ vtnet_init(void *xsc) struct vtnet_softc *sc; sc = xsc; - -#ifdef DEV_NETMAP - if (!NA(sc->vtnet_ifp)) { - D("try to attach again"); - vtnet_netmap_attach(sc); - } -#endif /* DEV_NETMAP */ VTNET_CORE_LOCK(sc); vtnet_init_locked(sc); Modified: head/sys/dev/virtio/network/if_vtnetvar.h ============================================================================== --- head/sys/dev/virtio/network/if_vtnetvar.h Wed Nov 14 15:23:39 2018 (r340435) +++ head/sys/dev/virtio/network/if_vtnetvar.h Wed Nov 14 15:39:48 2018 (r340436) @@ -79,6 +79,9 @@ struct vtnet_rxq { struct vtnet_rxq_stats vtnrx_stats; struct taskqueue *vtnrx_tq; struct task vtnrx_intrtask; +#ifdef DEV_NETMAP + struct virtio_net_hdr_mrg_rxbuf vtnrx_shrhdr; +#endif /* DEV_NETMAP */ char vtnrx_name[16]; } __aligned(CACHE_LINE_SIZE); @@ -114,6 +117,9 @@ struct vtnet_txq { #ifndef VTNET_LEGACY_TX struct task vtntx_defrtask; #endif +#ifdef DEV_NETMAP + struct virtio_net_hdr_mrg_rxbuf vtntx_shrhdr; +#endif /* DEV_NETMAP */ char vtntx_name[16]; } __aligned(CACHE_LINE_SIZE);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201811141539.wAEFdnKQ077428>