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net: remove 'fallback' argument from dev->ndo_select_queue()

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After the previous patch, all the callers of ndo_select_queue()
provide as a 'fallback' argument netdev_pick_tx.
The only exceptions are nested calls to ndo_select_queue(),
which pass down the 'fallback' available in the current scope
- still netdev_pick_tx.

We can drop such argument and replace fallback() invocation with
netdev_pick_tx(). This avoids an indirect call per xmit packet
in some scenarios (TCP syn, UDP unconnected, XDP generic, pktgen)
with device drivers implementing such ndo. It also clean the code
a bit.

Tested with ixgbe and CONFIG_FCOE=m

With pktgen using queue xmit:
threads		vanilla 	patched
		(kpps)		(kpps)
1		2334		2428
2		4166		4278
4		7895		8100

 v1 -> v2:
 - rebased after helper's name change

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2019-03-20 11:02:06 +01:00 • committed by David S. Miller
parent b71b5837f8
commit a350eccee5
32 changed files with 57 additions and 97 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/net/ethernet/renesas/ravb_main.c
View file

@ -1615,8 +1615,7 @@ drop:
}
static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
struct net_device *sb_dev,
select_queue_fallback_t fallback)
struct net_device *sb_dev)
{
/* If skb needs TX timestamp, it is handled in network control queue */
return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :