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if_vtnet: Rework 4be723f63 max multiqueue pairs check

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Verify the max_virtqueue_pairs is within the range allowed by
the spec.

Reviewed by: grehan (mentor)
Differential Revision: https://reviews.freebsd.org/D27920
This commit is contained in:
Bryan Venteicher 2021-01-19 04:55:25 +00:00
parent 42343a6316
commit b470419ea5
2 changed files with 32 additions and 18 deletions
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46
sys/dev/virtio/network/if_vtnet.c
View File

@ -657,6 +657,21 @@ vtnet_negotiate_features(struct vtnet_softc *sc)
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) {
/*
@ -763,25 +778,24 @@ vtnet_setup_features(struct vtnet_softc *sc)
}
if (sc->vtnet_max_vq_pairs > 1) {
int max;
int req;
/*
* Limit the maximum number of queue pairs to the lower of
* the number of CPUs and the configured maximum. The actual
* number of queues that get used may be less.
* Limit the maximum number of requested queue pairs to the
* number of CPUs and the configured maximum.
*/
max = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
if (max > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN) {
if (max > mp_ncpus)
max = mp_ncpus;
if (max > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX)
max = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX;
if (max > 1) {
sc->vtnet_requested_vq_pairs = max;
req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
if (req < 1)
req = 1;
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;
}
}
}
}
static int
@ -3272,7 +3286,7 @@ vtnet_set_active_vq_pairs(struct vtnet_softc *sc)
return;
}
npairs = sc->vtnet_requested_vq_pairs;
npairs = sc->vtnet_req_vq_pairs;
if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) {
device_printf(dev,
@ -4172,8 +4186,8 @@ vtnet_setup_sysctl(struct vtnet_softc *sc)
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs",
CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0,
"Number of maximum supported virtqueue pairs");
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "requested_vq_pairs",
CTLFLAG_RD, &sc->vtnet_requested_vq_pairs, 0,
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs",
CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0,
"Number of requested virtqueue pairs");
SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,

2
sys/dev/virtio/network/if_vtnetvar.h
View File

@ -168,8 +168,8 @@ struct vtnet_softc {
int vtnet_if_flags;
int vtnet_max_mtu;
int vtnet_act_vq_pairs;
int vtnet_req_vq_pairs;
int vtnet_max_vq_pairs;
int vtnet_requested_vq_pairs;
int vtnet_lro_entry_count;
int vtnet_lro_mbufq_depth;