[PATCH 3/3][Yakkety][SRU] virtio-net: restore VIRTIO_HDR_F_DATA_VALID on receiving
Jay Vosburgh
jay.vosburgh at canonical.com
Wed Apr 19 23:41:47 UTC 2017
From: Jason Wang <jasowang at redhat.com>
BugLink: https://bugs.launchpad.net/bugs/1683947
Commit 501db511397f ("virtio: don't set VIRTIO_NET_HDR_F_DATA_VALID on
xmit") in fact disables VIRTIO_HDR_F_DATA_VALID on receiving path too,
fixing this by adding a hint (has_data_valid) and set it only on the
receiving path.
Cc: Rolf Neugebauer <rolf.neugebauer at docker.com>
Signed-off-by: Jason Wang <jasowang at redhat.com>
Acked-by: Rolf Neugebauer <rolf.neugebauer at docker.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(backported from 6391a4481ba0796805d6581e42f9f0418c099e34)
Signed-off-by: Jay Vosburgh <jay.vosburgh at canonical.com>
---
drivers/net/macvtap.c | 2 +-
drivers/net/tun.c | 2 +-
drivers/net/virtio_net.c | 2 +-
include/linux/virtio_net.h | 6 +++++-
net/packet/af_packet.c | 2 +-
5 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 5da9861ad79c..72142a0140e9 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -822,7 +822,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
return -EINVAL;
if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
- macvtap_is_little_endian(q)))
+ macvtap_is_little_endian(q), true))
BUG();
if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 57f9e0ffa6ff..69de9dde4e28 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1381,7 +1381,7 @@ static ssize_t tun_put_user(struct tun_struct *tun,
return -EINVAL;
if (virtio_net_hdr_from_skb(skb, &gso,
- tun_is_little_endian(tun))) {
+ tun_is_little_endian(tun), true)) {
struct skb_shared_info *sinfo = skb_shinfo(skb);
pr_err("unexpected GSO type: "
"0x%x, gso_size %d, hdr_len %d\n",
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d8072092e5f0..d540f0d714af 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -839,7 +839,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
hdr = skb_vnet_hdr(skb);
if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
- virtio_is_little_endian(vi->vdev)))
+ virtio_is_little_endian(vi->vdev), false))
BUG();
if (vi->mergeable_rx_bufs)
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index 40914bb396e7..f211c348e592 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h
@@ -56,7 +56,8 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
struct virtio_net_hdr *hdr,
- bool little_endian)
+ bool little_endian,
+ bool has_data_valid)
{
memset(hdr, 0, sizeof(*hdr));
@@ -91,6 +92,9 @@ static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
skb_checksum_start_offset(skb));
hdr->csum_offset = __cpu_to_virtio16(little_endian,
skb->csum_offset);
+ } else if (has_data_valid &&
+ skb->ip_summed == CHECKSUM_UNNECESSARY) {
+ hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
} /* else everything is zero */
return 0;
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index e518c29e547b..d9f28d320b40 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1972,7 +1972,7 @@ static int __packet_rcv_vnet(const struct sk_buff *skb,
{
*vnet_hdr = (const struct virtio_net_hdr) { 0 };
- if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le()))
+ if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le(), true))
BUG();
return 0;
--
2.7.4
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