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if_vtnet.c
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if_vtnet.c
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
* 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 unmodified, 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 ``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 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.
*/
/* Driver for VirtIO network devices. */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/random.h>
#include <sys/sglist.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/taskqueue.h>
#include <sys/smp.h>
#include <machine/smp.h>
#include <vm/uma.h>
#include <net/debugnet.h>
#include <net/ethernet.h>
#include <net/pfil.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/if_vlan_var.h>
#include <net/bpf.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/tcp_lro.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/virtio/virtio.h>
#include <dev/virtio/virtqueue.h>
#include <dev/virtio/network/virtio_net.h>
#include <dev/virtio/network/if_vtnetvar.h>
#include "virtio_if.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#if defined(INET) || defined(INET6)
#include <machine/in_cksum.h>
#endif
static int vtnet_modevent(module_t, int, void *);
static int vtnet_probe(device_t);
static int vtnet_attach(device_t);
static int vtnet_detach(device_t);
static int vtnet_suspend(device_t);
static int vtnet_resume(device_t);
static int vtnet_shutdown(device_t);
static int vtnet_attach_completed(device_t);
static int vtnet_config_change(device_t);
static int vtnet_negotiate_features(struct vtnet_softc *);
static int vtnet_setup_features(struct vtnet_softc *);
static int vtnet_init_rxq(struct vtnet_softc *, int);
static int vtnet_init_txq(struct vtnet_softc *, int);
static int vtnet_alloc_rxtx_queues(struct vtnet_softc *);
static void vtnet_free_rxtx_queues(struct vtnet_softc *);
static int vtnet_alloc_rx_filters(struct vtnet_softc *);
static void vtnet_free_rx_filters(struct vtnet_softc *);
static int vtnet_alloc_virtqueues(struct vtnet_softc *);
static int vtnet_alloc_interface(struct vtnet_softc *);
static int vtnet_setup_interface(struct vtnet_softc *);
static int vtnet_ioctl_mtu(struct vtnet_softc *, int);
static int vtnet_ioctl_ifflags(struct vtnet_softc *);
static int vtnet_ioctl_multi(struct vtnet_softc *);
static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *);
static int vtnet_ioctl(struct ifnet *, u_long, caddr_t);
static uint64_t vtnet_get_counter(struct ifnet *, ift_counter);
static int vtnet_rxq_populate(struct vtnet_rxq *);
static void vtnet_rxq_free_mbufs(struct vtnet_rxq *);
static struct mbuf *
vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **);
static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *,
struct mbuf *, int);
static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int);
static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *);
static int vtnet_rxq_new_buf(struct vtnet_rxq *);
static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *,
uint16_t, int, struct virtio_net_hdr *);
static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *,
uint16_t, int, struct virtio_net_hdr *);
static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *,
struct virtio_net_hdr *);
static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int);
static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *);
static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int);
static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *,
struct virtio_net_hdr *);
static int vtnet_rxq_eof(struct vtnet_rxq *);
static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries);
static void vtnet_rx_vq_intr(void *);
static void vtnet_rxq_tq_intr(void *, int);
static int vtnet_txq_intr_threshold(struct vtnet_txq *);
static int vtnet_txq_below_threshold(struct vtnet_txq *);
static int vtnet_txq_notify(struct vtnet_txq *);
static void vtnet_txq_free_mbufs(struct vtnet_txq *);
static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *,
int *, int *, int *);
static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int,
int, struct virtio_net_hdr *);
static struct mbuf *
vtnet_txq_offload(struct vtnet_txq *, struct mbuf *,
struct virtio_net_hdr *);
static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **,
struct vtnet_tx_header *);
static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int);
#ifdef VTNET_LEGACY_TX
static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *);
static void vtnet_start(struct ifnet *);
#else
static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *);
static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *);
static void vtnet_txq_tq_deferred(void *, int);
#endif
static void vtnet_txq_start(struct vtnet_txq *);
static void vtnet_txq_tq_intr(void *, int);
static int vtnet_txq_eof(struct vtnet_txq *);
static void vtnet_tx_vq_intr(void *);
static void vtnet_tx_start_all(struct vtnet_softc *);
#ifndef VTNET_LEGACY_TX
static void vtnet_qflush(struct ifnet *);
#endif
static int vtnet_watchdog(struct vtnet_txq *);
static void vtnet_accum_stats(struct vtnet_softc *,
struct vtnet_rxq_stats *, struct vtnet_txq_stats *);
static void vtnet_tick(void *);
static void vtnet_start_taskqueues(struct vtnet_softc *);
static void vtnet_free_taskqueues(struct vtnet_softc *);
static void vtnet_drain_taskqueues(struct vtnet_softc *);
static void vtnet_drain_rxtx_queues(struct vtnet_softc *);
static void vtnet_stop_rendezvous(struct vtnet_softc *);
static void vtnet_stop(struct vtnet_softc *);
static int vtnet_virtio_reinit(struct vtnet_softc *);
static void vtnet_init_rx_filters(struct vtnet_softc *);
static int vtnet_init_rx_queues(struct vtnet_softc *);
static int vtnet_init_tx_queues(struct vtnet_softc *);
static int vtnet_init_rxtx_queues(struct vtnet_softc *);
static void vtnet_set_active_vq_pairs(struct vtnet_softc *);
static void vtnet_update_rx_offloads(struct vtnet_softc *);
static int vtnet_reinit(struct vtnet_softc *);
static void vtnet_init_locked(struct vtnet_softc *, int);
static void vtnet_init(void *);
static void vtnet_free_ctrl_vq(struct vtnet_softc *);
static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *,
struct sglist *, int, int);
static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *);
static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t);
static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t);
static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, int);
static int vtnet_set_promisc(struct vtnet_softc *, int);
static int vtnet_set_allmulti(struct vtnet_softc *, int);
static void vtnet_rx_filter(struct vtnet_softc *);
static void vtnet_rx_filter_mac(struct vtnet_softc *);
static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t);
static void vtnet_rx_filter_vlan(struct vtnet_softc *);
static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t);
static void vtnet_register_vlan(void *, struct ifnet *, uint16_t);
static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t);
static void vtnet_update_speed_duplex(struct vtnet_softc *);
static int vtnet_is_link_up(struct vtnet_softc *);
static void vtnet_update_link_status(struct vtnet_softc *);
static int vtnet_ifmedia_upd(struct ifnet *);
static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *);
static void vtnet_get_macaddr(struct vtnet_softc *);
static void vtnet_set_macaddr(struct vtnet_softc *);
static void vtnet_attached_set_macaddr(struct vtnet_softc *);
static void vtnet_vlan_tag_remove(struct mbuf *);
static void vtnet_set_rx_process_limit(struct vtnet_softc *);
static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *,
struct sysctl_oid_list *, struct vtnet_rxq *);
static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *,
struct sysctl_oid_list *, struct vtnet_txq *);
static void vtnet_setup_queue_sysctl(struct vtnet_softc *);
static void vtnet_load_tunables(struct vtnet_softc *);
static void vtnet_setup_sysctl(struct vtnet_softc *);
static int vtnet_rxq_enable_intr(struct vtnet_rxq *);
static void vtnet_rxq_disable_intr(struct vtnet_rxq *);
static int vtnet_txq_enable_intr(struct vtnet_txq *);
static void vtnet_txq_disable_intr(struct vtnet_txq *);
static void vtnet_enable_rx_interrupts(struct vtnet_softc *);
static void vtnet_enable_tx_interrupts(struct vtnet_softc *);
static void vtnet_enable_interrupts(struct vtnet_softc *);
static void vtnet_disable_rx_interrupts(struct vtnet_softc *);
static void vtnet_disable_tx_interrupts(struct vtnet_softc *);
static void vtnet_disable_interrupts(struct vtnet_softc *);
static int vtnet_tunable_int(struct vtnet_softc *, const char *, int);
DEBUGNET_DEFINE(vtnet);
#define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val)
#define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val)
#define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val)
#define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val)
#define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val)
#define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val)
/* Tunables. */
static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"VirtIO Net driver parameters");
static int vtnet_csum_disable = 0;
SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN,
&vtnet_csum_disable, 0, "Disables receive and send checksum offload");
static int vtnet_fixup_needs_csum = 0;
SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN,
&vtnet_fixup_needs_csum, 0,
"Calculate valid checksum for NEEDS_CSUM packets");
static int vtnet_tso_disable = 0;
SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN,
&vtnet_tso_disable, 0, "Disables TSO");
static int vtnet_lro_disable = 0;
SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN,
&vtnet_lro_disable, 0, "Disables hardware LRO");
static int vtnet_mq_disable = 0;
SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN,
&vtnet_mq_disable, 0, "Disables multiqueue support");
static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS;
SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN,
&vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs");
static int vtnet_tso_maxlen = IP_MAXPACKET;
SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
&vtnet_tso_maxlen, 0, "TSO burst limit");
static int vtnet_rx_process_limit = 1024;
SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
&vtnet_rx_process_limit, 0,
"Number of RX segments processed in one pass");
static int vtnet_lro_entry_count = 128;
SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN,
&vtnet_lro_entry_count, 0, "Software LRO entry count");
/* Enable sorted LRO, and the depth of the mbuf queue. */
static int vtnet_lro_mbufq_depth = 0;
SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN,
&vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue");
static uma_zone_t vtnet_tx_header_zone;
static struct virtio_feature_desc vtnet_feature_desc[] = {
{ VIRTIO_NET_F_CSUM, "TxChecksum" },
{ VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" },
{ VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" },
{ VIRTIO_NET_F_MAC, "MAC" },
{ VIRTIO_NET_F_GSO, "TxGSO" },
{ VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" },
{ VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" },
{ VIRTIO_NET_F_GUEST_ECN, "RxLROECN" },
{ VIRTIO_NET_F_GUEST_UFO, "RxUFO" },
{ VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" },
{ VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" },
{ VIRTIO_NET_F_HOST_ECN, "TxTSOECN" },
{ VIRTIO_NET_F_HOST_UFO, "TxUFO" },
{ VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" },
{ VIRTIO_NET_F_STATUS, "Status" },
{ VIRTIO_NET_F_CTRL_VQ, "CtrlVq" },
{ VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" },
{ VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" },
{ VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" },
{ VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
{ VIRTIO_NET_F_MQ, "Multiqueue" },
{ VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" },
{ VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" },
{ 0, NULL }
};
static device_method_t vtnet_methods[] = {
/* Device methods. */
DEVMETHOD(device_probe, vtnet_probe),
DEVMETHOD(device_attach, vtnet_attach),
DEVMETHOD(device_detach, vtnet_detach),
DEVMETHOD(device_suspend, vtnet_suspend),
DEVMETHOD(device_resume, vtnet_resume),
DEVMETHOD(device_shutdown, vtnet_shutdown),
/* VirtIO methods. */
DEVMETHOD(virtio_attach_completed, vtnet_attach_completed),
DEVMETHOD(virtio_config_change, vtnet_config_change),
DEVMETHOD_END
};
#ifdef DEV_NETMAP
#include <dev/netmap/if_vtnet_netmap.h>
#endif
static driver_t vtnet_driver = {
.name = "vtnet",
.methods = vtnet_methods,
.size = sizeof(struct vtnet_softc)
};
static devclass_t vtnet_devclass;
VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_devclass,
vtnet_modevent, 0);
MODULE_VERSION(vtnet, 1);
MODULE_DEPEND(vtnet, virtio, 1, 1, 1);
#ifdef DEV_NETMAP
MODULE_DEPEND(vtnet, netmap, 1, 1, 1);
#endif
VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter");
static int
vtnet_modevent(module_t mod, int type, void *unused)
{
int error = 0;
static int loaded = 0;
switch (type) {
case MOD_LOAD:
if (loaded++ == 0) {
vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr",
sizeof(struct vtnet_tx_header),
NULL, NULL, NULL, NULL, 0, 0);
#ifdef DEBUGNET
/*
* We need to allocate from this zone in the transmit path, so ensure
* that we have at least one item per header available.
* XXX add a separate zone like we do for mbufs? otherwise we may alloc
* buckets
*/
uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
#endif
}
break;
case MOD_QUIESCE:
if (uma_zone_get_cur(vtnet_tx_header_zone) > 0)
error = EBUSY;
break;
case MOD_UNLOAD:
if (--loaded == 0) {
uma_zdestroy(vtnet_tx_header_zone);
vtnet_tx_header_zone = NULL;
}
break;
case MOD_SHUTDOWN:
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static int
vtnet_probe(device_t dev)
{
return (VIRTIO_SIMPLE_PROBE(dev, vtnet));
}
static int
vtnet_attach(device_t dev)
{
struct vtnet_softc *sc;
int error;
sc = device_get_softc(dev);
sc->vtnet_dev = dev;
virtio_set_feature_desc(dev, vtnet_feature_desc);
VTNET_CORE_LOCK_INIT(sc);
callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0);
vtnet_load_tunables(sc);
error = vtnet_alloc_interface(sc);
if (error) {
device_printf(dev, "cannot allocate interface\n");
goto fail;
}
vtnet_setup_sysctl(sc);
error = vtnet_setup_features(sc);
if (error) {
device_printf(dev, "cannot setup features\n");
goto fail;
}
error = vtnet_alloc_rx_filters(sc);
if (error) {
device_printf(dev, "cannot allocate Rx filters\n");
goto fail;
}
error = vtnet_alloc_rxtx_queues(sc);
if (error) {
device_printf(dev, "cannot allocate queues\n");
goto fail;
}
error = vtnet_alloc_virtqueues(sc);
if (error) {
device_printf(dev, "cannot allocate virtqueues\n");
goto fail;
}
error = vtnet_setup_interface(sc);
if (error) {
device_printf(dev, "cannot setup interface\n");
goto fail;
}
error = virtio_setup_intr(dev, INTR_TYPE_NET);
if (error) {
device_printf(dev, "cannot setup interrupts\n");
ether_ifdetach(sc->vtnet_ifp);
goto fail;
}
#ifdef DEV_NETMAP
vtnet_netmap_attach(sc);
#endif
vtnet_start_taskqueues(sc);
fail:
if (error)
vtnet_detach(dev);
return (error);
}
static int
vtnet_detach(device_t dev)
{
struct vtnet_softc *sc;
struct ifnet *ifp;
sc = device_get_softc(dev);
ifp = sc->vtnet_ifp;
if (device_is_attached(dev)) {
VTNET_CORE_LOCK(sc);
vtnet_stop(sc);
VTNET_CORE_UNLOCK(sc);
callout_drain(&sc->vtnet_tick_ch);
vtnet_drain_taskqueues(sc);
ether_ifdetach(ifp);
}
#ifdef DEV_NETMAP
netmap_detach(ifp);
#endif
vtnet_free_taskqueues(sc);
if (sc->vtnet_vlan_attach != NULL) {
EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
sc->vtnet_vlan_attach = NULL;
}
if (sc->vtnet_vlan_detach != NULL) {
EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
sc->vtnet_vlan_detach = NULL;
}
ifmedia_removeall(&sc->vtnet_media);
if (ifp != NULL) {
if_free(ifp);
sc->vtnet_ifp = NULL;
}
vtnet_free_rxtx_queues(sc);
vtnet_free_rx_filters(sc);
if (sc->vtnet_ctrl_vq != NULL)
vtnet_free_ctrl_vq(sc);
VTNET_CORE_LOCK_DESTROY(sc);
return (0);
}
static int
vtnet_suspend(device_t dev)
{
struct vtnet_softc *sc;
sc = device_get_softc(dev);
VTNET_CORE_LOCK(sc);
vtnet_stop(sc);
sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
VTNET_CORE_UNLOCK(sc);
return (0);
}
static int
vtnet_resume(device_t dev)
{
struct vtnet_softc *sc;
struct ifnet *ifp;
sc = device_get_softc(dev);
ifp = sc->vtnet_ifp;
VTNET_CORE_LOCK(sc);
if (ifp->if_flags & IFF_UP)
vtnet_init_locked(sc, 0);
sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
VTNET_CORE_UNLOCK(sc);
return (0);
}
static int
vtnet_shutdown(device_t dev)
{
/*
* Suspend already does all of what we need to
* do here; we just never expect to be resumed.
*/
return (vtnet_suspend(dev));
}
static int
vtnet_attach_completed(device_t dev)
{
struct vtnet_softc *sc;
sc = device_get_softc(dev);
VTNET_CORE_LOCK(sc);
vtnet_attached_set_macaddr(sc);
VTNET_CORE_UNLOCK(sc);
return (0);
}
static int
vtnet_config_change(device_t dev)
{
struct vtnet_softc *sc;
sc = device_get_softc(dev);
VTNET_CORE_LOCK(sc);
vtnet_update_link_status(sc);
if (sc->vtnet_link_active != 0)
vtnet_tx_start_all(sc);
VTNET_CORE_UNLOCK(sc);
return (0);
}
static int
vtnet_negotiate_features(struct vtnet_softc *sc)
{
device_t dev;
uint64_t features, negotiated_features;
int no_csum;
dev = sc->vtnet_dev;
features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES :
VTNET_LEGACY_FEATURES;
/*
* TSO and LRO are only available when their corresponding checksum
* offload feature is also negotiated.
*/
no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable);
if (no_csum)
features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM);
if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable))
features &= ~VTNET_TSO_FEATURES;
if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable))
features &= ~VTNET_LRO_FEATURES;
#ifndef VTNET_LEGACY_TX
if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable))
features &= ~VIRTIO_NET_F_MQ;
#else
features &= ~VIRTIO_NET_F_MQ;
#endif
negotiated_features = virtio_negotiate_features(dev, features);
if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
uint16_t mtu;
mtu = virtio_read_dev_config_2(dev,
offsetof(struct virtio_net_config, mtu));
if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) {
device_printf(dev, "Invalid MTU value: %d. "
"MTU feature disabled.\n", mtu);
features &= ~VIRTIO_NET_F_MTU;
negotiated_features =
virtio_negotiate_features(dev, features);
}
}
if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
uint16_t npairs;
npairs = virtio_read_dev_config_2(dev,
offsetof(struct virtio_net_config, max_virtqueue_pairs));
if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) {
device_printf(dev, "Invalid max_virtqueue_pairs value: "
"%d. Multiqueue feature disabled.\n", npairs);
features &= ~VIRTIO_NET_F_MQ;
negotiated_features =
virtio_negotiate_features(dev, features);
}
}
if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
/*
* LRO without mergeable buffers requires special care. This
* is not ideal because every receive buffer must be large
* enough to hold the maximum TCP packet, the Ethernet header,
* and the header. This requires up to 34 descriptors with
* MCLBYTES clusters. If we do not have indirect descriptors,
* LRO is disabled since the virtqueue will not contain very
* many receive buffers.
*/
if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
device_printf(dev,
"Host LRO disabled since both mergeable buffers "
"and indirect descriptors were not negotiated\n");
features &= ~VTNET_LRO_FEATURES;
negotiated_features =
virtio_negotiate_features(dev, features);
} else
sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
}
sc->vtnet_features = negotiated_features;
sc->vtnet_negotiated_features = negotiated_features;
return (virtio_finalize_features(dev));
}
static int
vtnet_setup_features(struct vtnet_softc *sc)
{
device_t dev;
int error;
dev = sc->vtnet_dev;
error = vtnet_negotiate_features(sc);
if (error)
return (error);
if (virtio_with_feature(dev, VIRTIO_F_VERSION_1))
sc->vtnet_flags |= VTNET_FLAG_MODERN;
if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
sc->vtnet_flags |= VTNET_FLAG_INDIRECT;
if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX))
sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX;
if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
/* This feature should always be negotiated. */
sc->vtnet_flags |= VTNET_FLAG_MAC;
}
if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
sc->vtnet_max_mtu = virtio_read_dev_config_2(dev,
offsetof(struct virtio_net_config, mtu));
} else
sc->vtnet_max_mtu = VTNET_MAX_MTU;
if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) {
sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS;
sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
} else if (vtnet_modern(sc)) {
/* This is identical to the mergeable header. */
sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1);
} else
sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE;
else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG;
else
sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE;
/*
* Favor "hardware" LRO if negotiated, but support software LRO as
* a fallback; there is usually little benefit (or worse) with both.
*/
if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 &&
virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0)
sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) ||
virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX;
else
sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN;
sc->vtnet_req_vq_pairs = 1;
sc->vtnet_max_vq_pairs = 1;
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR))
sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC;
if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev,
offsetof(struct virtio_net_config,
max_virtqueue_pairs));
}
}
if (sc->vtnet_max_vq_pairs > 1) {
int req;
/*
* Limit the maximum number of requested queue pairs to the
* number of CPUs and the configured maximum.
*/
req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
if (req < 0)
req = 1;
if (req == 0)
req = mp_ncpus;
if (req > sc->vtnet_max_vq_pairs)
req = sc->vtnet_max_vq_pairs;
if (req > mp_ncpus)
req = mp_ncpus;
if (req > 1) {
sc->vtnet_req_vq_pairs = req;
sc->vtnet_flags |= VTNET_FLAG_MQ;
}
}
return (0);
}
static int
vtnet_init_rxq(struct vtnet_softc *sc, int id)
{
struct vtnet_rxq *rxq;
rxq = &sc->vtnet_rxqs[id];
snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d",
device_get_nameunit(sc->vtnet_dev), id);
mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF);
rxq->vtnrx_sc = sc;
rxq->vtnrx_id = id;
rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT);
if (rxq->vtnrx_sg == NULL)
return (ENOMEM);
#if defined(INET) || defined(INET6)
if (vtnet_software_lro(sc)) {
if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp,
sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0)
return (ENOMEM);
}
#endif
NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq);
rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT,
taskqueue_thread_enqueue, &rxq->vtnrx_tq);
return (rxq->vtnrx_tq == NULL ? ENOMEM : 0);
}
static int
vtnet_init_txq(struct vtnet_softc *sc, int id)
{
struct vtnet_txq *txq;
txq = &sc->vtnet_txqs[id];
snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d",
device_get_nameunit(sc->vtnet_dev), id);
mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF);
txq->vtntx_sc = sc;
txq->vtntx_id = id;
txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT);
if (txq->vtntx_sg == NULL)
return (ENOMEM);
#ifndef VTNET_LEGACY_TX
txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF,
M_NOWAIT, &txq->vtntx_mtx);
if (txq->vtntx_br == NULL)
return (ENOMEM);
TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq);
#endif
TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq);
txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT,
taskqueue_thread_enqueue, &txq->vtntx_tq);
if (txq->vtntx_tq == NULL)
return (ENOMEM);
return (0);
}
static int
vtnet_alloc_rxtx_queues(struct vtnet_softc *sc)
{
int i, npairs, error;
npairs = sc->vtnet_max_vq_pairs;
sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF,
M_NOWAIT | M_ZERO);
sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF,
M_NOWAIT | M_ZERO);
if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL)
return (ENOMEM);
for (i = 0; i < npairs; i++) {
error = vtnet_init_rxq(sc, i);
if (error)
return (error);
error = vtnet_init_txq(sc, i);
if (error)
return (error);
}
vtnet_set_rx_process_limit(sc);
vtnet_setup_queue_sysctl(sc);
return (0);
}
static void
vtnet_destroy_rxq(struct vtnet_rxq *rxq)
{
rxq->vtnrx_sc = NULL;
rxq->vtnrx_id = -1;
#if defined(INET) || defined(INET6)
tcp_lro_free(&rxq->vtnrx_lro);
#endif
if (rxq->vtnrx_sg != NULL) {
sglist_free(rxq->vtnrx_sg);
rxq->vtnrx_sg = NULL;
}
if (mtx_initialized(&rxq->vtnrx_mtx) != 0)
mtx_destroy(&rxq->vtnrx_mtx);
}
static void
vtnet_destroy_txq(struct vtnet_txq *txq)
{
txq->vtntx_sc = NULL;
txq->vtntx_id = -1;
if (txq->vtntx_sg != NULL) {
sglist_free(txq->vtntx_sg);
txq->vtntx_sg = NULL;
}
#ifndef VTNET_LEGACY_TX
if (txq->vtntx_br != NULL) {
buf_ring_free(txq->vtntx_br, M_DEVBUF);
txq->vtntx_br = NULL;
}
#endif
if (mtx_initialized(&txq->vtntx_mtx) != 0)
mtx_destroy(&txq->vtntx_mtx);
}
static void
vtnet_free_rxtx_queues(struct vtnet_softc *sc)
{
int i;
if (sc->vtnet_rxqs != NULL) {
for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
vtnet_destroy_rxq(&sc->vtnet_rxqs[i]);
free(sc->vtnet_rxqs, M_DEVBUF);
sc->vtnet_rxqs = NULL;
}
if (sc->vtnet_txqs != NULL) {
for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
vtnet_destroy_txq(&sc->vtnet_txqs[i]);
free(sc->vtnet_txqs, M_DEVBUF);
sc->vtnet_txqs = NULL;
}
}
static int
vtnet_alloc_rx_filters(struct vtnet_softc *sc)
{
if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (sc->vtnet_mac_filter == NULL)
return (ENOMEM);
}
if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) *
VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO);
if (sc->vtnet_vlan_filter == NULL)
return (ENOMEM);
}
return (0);
}
static void
vtnet_free_rx_filters(struct vtnet_softc *sc)
{