ixgbe: Don't receive packets when the napi budget == 0

Processing any incoming packets with a with a napi budget of 0
is incorrect driver behavior.

This matters as netpoll will shortly call drivers with a budget of 0
to avoid receive packet processing happening in hard irq context.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 5d314fe..18cd8ca 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -2076,7 +2076,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 #endif /* IXGBE_FCOE */
        u16 cleaned_count = ixgbe_desc_unused(rx_ring);
 
-       do {
+       while (likely(total_rx_packets < budget)) {
                union ixgbe_adv_rx_desc *rx_desc;
                struct sk_buff *skb;
 
@@ -2151,7 +2151,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 
                /* update budget accounting */
                total_rx_packets++;
-       } while (likely(total_rx_packets < budget));
+       }
 
        u64_stats_update_begin(&rx_ring->syncp);
        rx_ring->stats.packets += total_rx_packets;