diff options
| -rw-r--r-- | drivers/net/ixgb/ixgb_main.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c index cfd67d812f0d..13181c4f1d20 100644 --- a/drivers/net/ixgb/ixgb_main.c +++ b/drivers/net/ixgb/ixgb_main.c @@ -1266,6 +1266,7 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, struct ixgb_buffer *buffer_info; int len = skb->len; unsigned int offset = 0, size, count = 0, i; + unsigned int mss = skb_shinfo(skb)->tso_size; unsigned int nr_frags = skb_shinfo(skb)->nr_frags; unsigned int f; @@ -1277,6 +1278,11 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, while(len) { buffer_info = &tx_ring->buffer_info[i]; size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE); + /* Workaround for premature desc write-backs + * in TSO mode. Append 4-byte sentinel desc */ + if(unlikely(mss && !nr_frags && size == len && size > 8)) + size -= 4; + buffer_info->length = size; buffer_info->dma = pci_map_single(adapter->pdev, @@ -1301,6 +1307,12 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb, while(len) { buffer_info = &tx_ring->buffer_info[i]; size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE); + /* Workaround for premature desc write-backs + * in TSO mode. Append 4-byte sentinel desc */ + if(unlikely(mss && (f == (nr_frags-1)) && (size == len) + && (size > 8))) + size -= 4; + buffer_info->length = size; buffer_info->dma = pci_map_page(adapter->pdev, @@ -1378,7 +1390,8 @@ ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags) #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \ (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0)) #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \ - MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 + MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 \ + /* one more for TSO workaround */ + 1 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) @@ -1416,7 +1429,7 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev) return NETDEV_TX_OK; } - if (tso) + if (likely(tso)) tx_flags |= IXGB_TX_FLAGS_TSO; else if(ixgb_tx_csum(adapter, skb)) tx_flags |= IXGB_TX_FLAGS_CSUM; |