bnx2x: switch to napi_complete_done()

Switch from napi_complete() to napi_complete_done()
for better GRO support (gro_flush_timeout) and core NAPI
features.

Do not rearm interrupts if we are busy polling,
to reduce bus and interrupts overhead.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Adam Belay <abelay@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Cc: Yuval Mintz <Yuval.Mintz@cavium.com>
Cc: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c

@@ -3248,13 +3248,14 @@ static int bnx2x_poll(struct napi_struct *napi, int budget)
 			rmb();
 
 			if (!(bnx2x_has_rx_work(fp) || bnx2x_has_tx_work(fp))) {
-				napi_complete(napi);
-				/* Re-enable interrupts */
-				DP(NETIF_MSG_RX_STATUS,
-				   "Update index to %d\n", fp->fp_hc_idx);
-				bnx2x_ack_sb(bp, fp->igu_sb_id, USTORM_ID,
-					     le16_to_cpu(fp->fp_hc_idx),
-					     IGU_INT_ENABLE, 1);
+				if (napi_complete_done(napi, rx_work_done)) {
+					/* Re-enable interrupts */
+					DP(NETIF_MSG_RX_STATUS,
+					   "Update index to %d\n", fp->fp_hc_idx);
+					bnx2x_ack_sb(bp, fp->igu_sb_id, USTORM_ID,
+						     le16_to_cpu(fp->fp_hc_idx),
+						     IGU_INT_ENABLE, 1);
+				}
 			} else {
 				rx_work_done = budget;
 			}