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| author | David S. Miller <davem@davemloft.net> | 2016-04-09 17:41:41 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-09 17:41:41 -0400 |
| commit | ae95d7126104591348d37aaf78c8325967e02386 (patch) | |
| tree | 3270712f030549d77d4c55246d056e02b9def29d /drivers/net/ethernet/intel/e1000 | |
| parent | 03c5b534185f9844c1b5fcfdbae2adc32821ec42 (diff) | |
| parent | 183c948a3cb3efbf45eabed41fa7ee04c19378fc (diff) | |
| download | linux-ae95d7126104591348d37aaf78c8325967e02386.tar.gz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'drivers/net/ethernet/intel/e1000')
| -rw-r--r-- | drivers/net/ethernet/intel/e1000/e1000_main.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index 6de0c7df56fa..f42129d09e2c 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -3106,7 +3106,7 @@ static int e1000_maybe_stop_tx(struct net_device *netdev, return __e1000_maybe_stop_tx(netdev, size); } -#define TXD_USE_COUNT(S, X) (((S) >> (X)) + 1) +#define TXD_USE_COUNT(S, X) (((S) + ((1 << (X)) - 1)) >> (X)) static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { @@ -3256,12 +3256,29 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb, nr_frags, mss); if (count) { + /* The descriptors needed is higher than other Intel drivers + * due to a number of workarounds. The breakdown is below: + * Data descriptors: MAX_SKB_FRAGS + 1 + * Context Descriptor: 1 + * Keep head from touching tail: 2 + * Workarounds: 3 + */ + int desc_needed = MAX_SKB_FRAGS + 7; + netdev_sent_queue(netdev, skb->len); skb_tx_timestamp(skb); e1000_tx_queue(adapter, tx_ring, tx_flags, count); + + /* 82544 potentially requires twice as many data descriptors + * in order to guarantee buffers don't end on evenly-aligned + * dwords + */ + if (adapter->pcix_82544) + desc_needed += MAX_SKB_FRAGS + 1; + /* Make sure there is space in the ring for the next send. */ - e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2); + e1000_maybe_stop_tx(netdev, tx_ring, desc_needed); if (!skb->xmit_more || netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) { |