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Subject[PATCH v2] virtio_net: bulk free tx skbs
Use napi_consume_skb() to get bulk free.  Note that napi_consume_skb is
safe to call in a non-napi context as long as the napi_budget flag is
correct.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

Changes from v1:
rebase on master.

lightly tested on developer's box.

drivers/net/virtio_net.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 023725086046..8fadd8eaf601 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1330,7 +1330,7 @@ static int virtnet_receive(struct receive_queue *rq, int budget,
return stats.packets;
}

-static void free_old_xmit_skbs(struct send_queue *sq)
+static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
{
struct sk_buff *skb;
unsigned int len;
@@ -1343,7 +1343,7 @@ static void free_old_xmit_skbs(struct send_queue *sq)
bytes += skb->len;
packets++;

- dev_consume_skb_any(skb);
+ napi_consume_skb(skb, in_napi);
}

/* Avoid overhead when no packets have been processed
@@ -1369,7 +1369,7 @@ static void virtnet_poll_cleantx(struct receive_queue *rq)
return;

if (__netif_tx_trylock(txq)) {
- free_old_xmit_skbs(sq);
+ free_old_xmit_skbs(sq, true);
__netif_tx_unlock(txq);
}

@@ -1445,7 +1445,7 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq));

__netif_tx_lock(txq, raw_smp_processor_id());
- free_old_xmit_skbs(sq);
+ free_old_xmit_skbs(sq, true);
__netif_tx_unlock(txq);

virtqueue_napi_complete(napi, sq->vq, 0);
@@ -1514,7 +1514,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
bool use_napi = sq->napi.weight;

/* Free up any pending old buffers before queueing new ones. */
- free_old_xmit_skbs(sq);
+ free_old_xmit_skbs(sq, false);

if (use_napi && kick)
virtqueue_enable_cb_delayed(sq->vq);
@@ -1557,7 +1557,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
if (!use_napi &&
unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
/* More just got used, free them then recheck. */
- free_old_xmit_skbs(sq);
+ free_old_xmit_skbs(sq, false);
if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
netif_start_subqueue(dev, qnum);
virtqueue_disable_cb(sq->vq);
--
MST
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