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net: e1000e: support txtd update delay via xmit_more 

Don't update Tx tail descriptor if queue hasn't been stopped
and we know at least one more skb will be sent right away.

Signed-off-by: Florian Westphal <fw@strlen.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Florian Westphal 2015-01-09 09:26:14 +00:00 committed by Jeff Kirsher
parent 8a4d0b93c1
commit 472f31f572
1 changed files with 15 additions and 10 deletions
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25
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -5444,16 +5444,6 @@ static void e1000_tx_queue(struct e1000_ring *tx_ring, int tx_flags, int count)
wmb();
tx_ring->next_to_use = i;
if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
e1000e_update_tdt_wa(tx_ring, i);
else
writel(i, tx_ring->tail);
/* we need this if more than one processor can write to our tail
* at a time, it synchronizes IO on IA64/Altix systems
*/
mmiowb();
}
#define MINIMUM_DHCP_PACKET_SIZE 282
@ -5655,6 +5645,21 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
(MAX_SKB_FRAGS *
DIV_ROUND_UP(PAGE_SIZE,
adapter->tx_fifo_limit) + 2));
if (!skb->xmit_more ||
netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) {
if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
e1000e_update_tdt_wa(tx_ring,
tx_ring->next_to_use);
else
writel(tx_ring->next_to_use, tx_ring->tail);
/* we need this if more than one processor can write
* to our tail at a time, it synchronizes IO on
*IA64/Altix systems
*/
mmiowb();
}
} else {
dev_kfree_skb_any(skb);
tx_ring->buffer_info[first].time_stamp = 0;