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| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-03-27 15:42:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-29 17:58:37 -0400 |
| commit | 5efeac44cfca62f66a1b2919fc8ec7f7c726d15b (patch) | |
| tree | b4d7d338f3ace293b905014afc70afc3189a89ff /include | |
| parent | 080b3c19a4ffe4677d7449880f4d0cea07182474 (diff) | |
| download | linux-stable-5efeac44cfca62f66a1b2919fc8ec7f7c726d15b.tar.gz linux-stable-5efeac44cfca62f66a1b2919fc8ec7f7c726d15b.tar.bz2 linux-stable-5efeac44cfca62f66a1b2919fc8ec7f7c726d15b.zip | |
netpoll: Respect NETIF_F_LLTX
Stop taking the transmit lock when a network device has specified
NETIF_F_LLTX.
If no locks needed to trasnmit a packet this is the ideal scenario for
netpoll as all packets can be trasnmitted immediately.
Even if some locks are needed in ndo_start_xmit skipping any unnecessary
serialization is desirable for netpoll as it makes it more likely a
debugging packet may be trasnmitted immediately instead of being
deferred until later.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0d8c8718980a..4cd5e9e13c87 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2909,6 +2909,11 @@ static inline void netif_tx_unlock_bh(struct net_device *dev) } \ } +#define HARD_TX_TRYLOCK(dev, txq) \ + (((dev->features & NETIF_F_LLTX) == 0) ? \ + __netif_tx_trylock(txq) : \ + true ) + #define HARD_TX_UNLOCK(dev, txq) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ __netif_tx_unlock(txq); \ |