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

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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>
This commit is contained in:
Eric W. Biederman 2014-03-14 18:00:06 -07:00 • committed by David S. Miller
parent 390f86dfbd
commit 57ba34c9b0
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/intel/igb/igb_main.c
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@ -6946,7 +6946,7 @@ static bool igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
unsigned int total_bytes = 0, total_packets = 0; unsigned int total_bytes = 0, total_packets = 0;
u16 cleaned_count = igb_desc_unused(rx_ring); u16 cleaned_count = igb_desc_unused(rx_ring);
do { while (likely(total_packets < budget)) {
union e1000_adv_rx_desc *rx_desc; union e1000_adv_rx_desc *rx_desc;
/* return some buffers to hardware, one at a time is too slow */ /* return some buffers to hardware, one at a time is too slow */
@ -6998,7 +6998,7 @@ static bool igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
/* update budget accounting */ /* update budget accounting */
total_packets++; total_packets++;
} while (likely(total_packets < budget)); }
/* place incomplete frames back on ring for completion */ /* place incomplete frames back on ring for completion */
rx_ring->skb = skb; rx_ring->skb = skb;