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virtio: fix scatterlist sizing in net driver.
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Herbert Xu points out (within another patch) that my scatterlists are
too short: one entry for the gso header, one for the skb->data, and
MAX_SKB_FRAGS for all the fragments.

Fix both xmit and recv sides (recv currently unused, coming in later
patch).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Rusty Russell committed May 2, 2008
1 parent cb38fa2 commit 0527168
Showing 1 changed file with 4 additions and 4 deletions.
8 changes: 4 additions & 4 deletions drivers/net/virtio_net.c
Original file line number Diff line number Diff line change
Expand Up @@ -142,10 +142,10 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
static void try_fill_recv(struct virtnet_info *vi)
{
struct sk_buff *skb;
struct scatterlist sg[1+MAX_SKB_FRAGS];
struct scatterlist sg[2+MAX_SKB_FRAGS];
int num, err;

sg_init_table(sg, 1+MAX_SKB_FRAGS);
sg_init_table(sg, 2+MAX_SKB_FRAGS);
for (;;) {
skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN);
if (unlikely(!skb))
Expand Down Expand Up @@ -231,11 +231,11 @@ static int start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct virtnet_info *vi = netdev_priv(dev);
int num, err;
struct scatterlist sg[1+MAX_SKB_FRAGS];
struct scatterlist sg[2+MAX_SKB_FRAGS];
struct virtio_net_hdr *hdr;
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;

sg_init_table(sg, 1+MAX_SKB_FRAGS);
sg_init_table(sg, 2+MAX_SKB_FRAGS);

pr_debug("%s: xmit %p " MAC_FMT "\n", dev->name, skb,
dest[0], dest[1], dest[2],
Expand Down

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