xen-netfront: Rework the fix for Rx stall during OOM and network stress (538d9291) · Commits · 戴 / test

The commit ("xen-netfront: Fix Rx stall during network stress and OOM") caused the refill timer to be triggerred almost on all invocations of xennet_alloc_rx_buffers for certain workloads. This reworks the fix by reverting to the old behaviour and taking into consideration the skb allocation failure. Refill timer is now triggered on insufficient requests or skb allocation failure. Signed-off-by:

Vineeth Remanan Pillai <vineethp@amazon.com> Fixes: (xen-netfront: Fix Rx stall during network stress and OOM) Reported-by:

Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by:

Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/xen-netfront.c

+11 −3

Original line number	Diff line number	Diff line
		@@ -281,6 +281,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
		{
		RING_IDX req_prod = queue->rx.req_prod_pvt;
		int notify;
		int err = 0;

		if (unlikely(!netif_carrier_ok(queue->info->netdev)))
		return;
		@@ -295,8 +296,10 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
		struct xen_netif_rx_request *req;

		skb = xennet_alloc_one_rx_buffer(queue);
		if (!skb)
		if (!skb) {
		err = -ENOMEM;
		break;
		}

		id = xennet_rxidx(req_prod);

		@@ -320,8 +323,13 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)

		queue->rx.req_prod_pvt = req_prod;

		/* Not enough requests? Try again later. */
		if (req_prod - queue->rx.sring->req_prod < NET_RX_SLOTS_MIN) {
		/* Try again later if there are not enough requests or skb allocation
		* failed.
		* Enough requests is quantified as the sum of newly created slots and
		* the unconsumed slots at the backend.
		*/
		if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN \|\|
		unlikely(err)) {
		mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
		return;
		}

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