|PATCH net-next] tg3: add tx_dropped counter

If a frame cant be transmitted, it is silently discarded.

Add a counter to report these errors to user.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index b865e9f..161cbbb 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6671,10 +6671,8 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
                u32 tcp_opt_len, hdr_len;
 
                if (skb_header_cloned(skb) &&
-                   pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
-                       dev_kfree_skb(skb);
-                       goto out_unlock;
-               }
+                   pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+                       goto drop;
 
                iph = ip_hdr(skb);
                tcp_opt_len = tcp_optlen(skb);
@@ -6746,10 +6744,9 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
        len = skb_headlen(skb);
 
        mapping = pci_map_single(tp->pdev, skb->data, len, PCI_DMA_TODEVICE);
-       if (pci_dma_mapping_error(tp->pdev, mapping)) {
-               dev_kfree_skb(skb);
-               goto out_unlock;
-       }
+       if (pci_dma_mapping_error(tp->pdev, mapping))
+               goto drop;
+
 
        tnapi->tx_buffers[entry].skb = skb;
        dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping, mapping);
@@ -6805,7 +6802,7 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
                budget = tg3_tx_avail(tnapi);
                if (tigon3_dma_hwbug_workaround(tnapi, &skb, &entry, &budget,
                                                base_flags, mss, vlan))
-                       goto out_unlock;
+                       goto drop_nofree;
        }
 
        skb_tx_timestamp(skb);
@@ -6827,15 +6824,16 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        netif_tx_wake_queue(txq);
        }
 
-out_unlock:
        mmiowb();
-
        return NETDEV_TX_OK;
 
 dma_error:
        tg3_tx_skb_unmap(tnapi, tnapi->tx_prod, i);
-       dev_kfree_skb(skb);
        tnapi->tx_buffers[tnapi->tx_prod].skb = NULL;
+drop:
+       dev_kfree_skb(skb);
+drop_nofree:
+       tp->tx_dropped++;
        return NETDEV_TX_OK;
 }
 
@@ -10009,6 +10007,7 @@ static struct rtnl_link_stats64 *tg3_get_stats64(struct net_device *dev,
                get_stat64(&hw_stats->rx_discards);
 
        stats->rx_dropped = tp->rx_dropped;
+       stats->tx_dropped = tp->tx_dropped;
 
        return stats;
 }

diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index d2976f3..f32f288 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -2990,6 +2990,7 @@ struct tg3 {
 
        /* begin "everything else" cacheline(s) section */
        unsigned long                   rx_dropped;
+       unsigned long                   tx_dropped;
        struct rtnl_link_stats64        net_stats_prev;
        struct tg3_ethtool_stats        estats;
        struct tg3_ethtool_stats        estats_prev;