Commit 2b5bbe3b authored Sep 24, 2009 by Rusty Russell

virtio_net: skb_orphan() and nf_reset() in xmit path.



The complex transmit free logic was introduced to avoid hangs on
removing the ip_conntrack module and also because drivers aren't
generally supposed to keep stale skbs for unbounded times.

After some debate, it was decided that while doing skb_orphan()
generally is a rat's nest, we can do it in this driver.  Following
patches take advantage of this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent a724eada

drivers/net/virtio_net.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -528,8 +528,12 @@ static int xmit_skb(struct virtnet_info vi, struct sk_buff skb)
		num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;

		err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
		if (err >= 0 && !vi->free_in_tasklet)
		if (err >= 0 && !vi->free_in_tasklet) {
		/* Don't wait up for transmitted skbs to be freed. */
		skb_orphan(skb);
		nf_reset(skb);
		mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
		}

		return err;
		}