Yuri Benditovich
2021-Jan-05 12:24 UTC
[RFC PATCH 2/7] vhost: support for hash report virtio-net feature
According to the virtio specification if VIRTIO_NET_F_HASH_REPORT
feature acked the virtio-net header is extended to hold the hash
value and hash report type.
Signed-off-by: Yuri Benditovich <yuri.benditovich at daynix.com>
---
drivers/vhost/net.c | 37 +++++++++++++++++++++++++++++--------
1 file changed, 29 insertions(+), 8 deletions(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 531a00d703cd..31a894b9a992 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -73,7 +73,8 @@ enum {
VHOST_NET_FEATURES = VHOST_FEATURES |
(1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
(1ULL << VIRTIO_NET_F_MRG_RXBUF) |
- (1ULL << VIRTIO_F_ACCESS_PLATFORM)
+ (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
+ (1ULL << VIRTIO_NET_F_HASH_REPORT)
};
enum {
@@ -1108,14 +1109,16 @@ static void handle_rx(struct vhost_net *net)
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT,
};
- struct virtio_net_hdr hdr = {
- .flags = 0,
- .gso_type = VIRTIO_NET_HDR_GSO_NONE
+ struct virtio_net_hdr_v1_hash hdrv1 = {
+ {
+ .flags = 0,
+ .gso_type = VIRTIO_NET_HDR_GSO_NONE
+ }
};
size_t total_len = 0;
int err, mergeable;
s16 headcount;
- size_t vhost_hlen, sock_hlen;
+ size_t vhost_hlen, sock_hlen, extra_hlen;
size_t vhost_len, sock_len;
bool busyloop_intr = false;
struct socket *sock;
@@ -1137,9 +1140,12 @@ static void handle_rx(struct vhost_net *net)
vhost_hlen = nvq->vhost_hlen;
sock_hlen = nvq->sock_hlen;
+
vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ?
vq->log : NULL;
mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF);
+ extra_hlen = vhost_has_feature(vq, VIRTIO_NET_F_HASH_REPORT) ?
+ sizeof(hdrv1) - sizeof(hdrv1.hdr) : 0;
do {
sock_len = vhost_net_rx_peek_head_len(net, sock->sk,
@@ -1201,8 +1207,8 @@ static void handle_rx(struct vhost_net *net)
}
/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
if (unlikely(vhost_hlen)) {
- if (copy_to_iter(&hdr, sizeof(hdr),
- &fixup) != sizeof(hdr)) {
+ if (copy_to_iter(&hdrv1, sizeof(struct virtio_net_hdr),
+ &fixup) != sizeof(struct virtio_net_hdr)) {
vq_err(vq, "Unable to write vnet_hdr "
"at addr %p\n", vq->iov->iov_base);
goto out;
@@ -1211,7 +1217,7 @@ static void handle_rx(struct vhost_net *net)
/* Header came from socket; we'll need to patch
* ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF
*/
- iov_iter_advance(&fixup, sizeof(hdr));
+ iov_iter_advance(&fixup, sizeof(struct virtio_net_hdr));
}
/* TODO: Should check and handle checksum. */
@@ -1223,6 +1229,18 @@ static void handle_rx(struct vhost_net *net)
vhost_discard_vq_desc(vq, headcount);
goto out;
}
+ if (unlikely(extra_hlen)) {
+ if (unlikely(vhost_hlen)) {
+ if (copy_to_iter(&hdrv1.hash_value, extra_hlen,
+ &fixup) != extra_hlen) {
+ vq_err(vq, "Unable to write extra_hdr "
+ "at addr %p\n", vq->iov->iov_base);
+ goto out;
+ }
+ } else {
+ iov_iter_advance(&fixup, extra_hlen);
+ }
+ }
nvq->done_idx += headcount;
if (nvq->done_idx > VHOST_NET_BATCH)
vhost_net_signal_used(nvq);
@@ -1624,6 +1642,9 @@ static int vhost_net_set_features(struct vhost_net *n, u64
features)
(1ULL << VIRTIO_F_VERSION_1))) ?
sizeof(struct virtio_net_hdr_mrg_rxbuf) :
sizeof(struct virtio_net_hdr);
+ if (features & (1ULL << VIRTIO_NET_F_HASH_REPORT)) {
+ hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
+ }
if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) {
/* vhost provides vnet_hdr */
vhost_hlen = hdr_len;
--
2.17.1