bnx2x: Filter packets on FCoE rings

Whenever bnx2x fails to transmit a packet due to a full Tx ring, if the
ring size is zero (indicating an FCoE ring) driver filters the packet out
and gracefully continues.
Driver also gathers statistics on such filtered packets.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index e95174d451a5..5e07aa5e1aea 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -3127,11 +3127,16 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
                         BDS_PER_TX_PKT +
                         NEXT_CNT_PER_TX_PKT(MAX_BDS_PER_TX_PKT))) {
                 /* Handle special storage cases separately */
-                if (txdata->tx_ring_size != 0) {
-                        BNX2X_ERR("BUG! Tx ring full when queue awake!\n");
+                if (txdata->tx_ring_size == 0) {
+                        struct bnx2x_eth_q_stats *q_stats =
+                                bnx2x_fp_qstats(bp, txdata->parent_fp);
+                        q_stats->driver_filtered_tx_pkt++;
+                        dev_kfree_skb(skb);
+                        return NETDEV_TX_OK;
+                }
                         bnx2x_fp_qstats(bp, txdata->parent_fp)->driver_xoff++;
                         netif_tx_stop_queue(txq);
-                }
+                BNX2X_ERR("BUG! Tx ring full when queue awake!\n");
 
                 return NETDEV_TX_BUSY;
         }