i40e: 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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index daa3b295ff3d..88666adb0743 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1302,6 +1302,9 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
         u8 rx_ptype;
         u64 qword;
 
+        if (budget <= 0)
+                return 0;
+
         rx_desc = I40E_RX_DESC(rx_ring, i);
         qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
         rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >>