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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

6
drivers/net/xen-netback/interface.c
View file

@ -148,8 +148,7 @@ void xenvif_wake_queue(struct xenvif_queue *queue)
}
static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
struct net_device *sb_dev,
select_queue_fallback_t fallback)
struct net_device *sb_dev)
{
struct xenvif *vif = netdev_priv(dev);
unsigned int size = vif->hash.size;
@ -162,7 +161,8 @@ static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
return 0;
if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
return fallback(dev, skb, NULL) % dev->real_num_tx_queues;
return netdev_pick_tx(dev, skb, NULL) %
dev->real_num_tx_queues;
xenvif_set_skb_hash(vif, skb);