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virtio-net: remove big packet XDP codes 

Now we in fact don't allow XDP for big packets, remove its codes.

Cc: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2016-12-23 22:37:31 +08:00 committed by David S. Miller
parent 92502fe86c
commit c47a43d300
1 changed files with 3 additions and 41 deletions
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44
drivers/net/virtio_net.c
View File

@ -344,11 +344,7 @@ static void virtnet_xdp_xmit(struct virtnet_info *vi,
/* Free up any pending old buffers before queueing new ones. */
while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) {
struct page *sent_page = virt_to_head_page(xdp_sent);
if (vi->mergeable_rx_bufs)
put_page(sent_page);
else
give_pages(rq, sent_page);
put_page(sent_page);
}
/* Zero header and leave csum up to XDP layers */
@ -360,15 +356,8 @@ static void virtnet_xdp_xmit(struct virtnet_info *vi,
err = virtqueue_add_outbuf(sq->vq, sq->sg, num_sg,
xdp->data, GFP_ATOMIC);
if (unlikely(err)) {
if (vi->mergeable_rx_bufs)
put_page(page);
else
give_pages(rq, page);
put_page(page);
return; // On error abort to avoid unnecessary kick
} else if (!vi->mergeable_rx_bufs) {
/* If not mergeable bufs must be big packets so cleanup pages */
give_pages(rq, (struct page *)page->private);
page->private = 0;
}
virtqueue_kick(sq->vq);
@ -430,44 +419,17 @@ static struct sk_buff *receive_big(struct net_device *dev,
void *buf,
unsigned int len)
{
struct bpf_prog *xdp_prog;
struct page *page = buf;
struct sk_buff *skb;
struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
rcu_read_lock();
xdp_prog = rcu_dereference(rq->xdp_prog);
if (xdp_prog) {
struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
u32 act;
if (unlikely(hdr->hdr.gso_type))
goto err_xdp;
act = do_xdp_prog(vi, rq, xdp_prog, page, 0, len);
switch (act) {
case XDP_PASS:
break;
case XDP_TX:
rcu_read_unlock();
goto xdp_xmit;
case XDP_DROP:
default:
goto err_xdp;
}
}
rcu_read_unlock();
skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
if (unlikely(!skb))
goto err;
return skb;
err_xdp:
rcu_read_unlock();
err:
dev->stats.rx_dropped++;
give_pages(rq, page);
xdp_xmit:
return NULL;
}