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net: Allow RX queue selection to seed TX queue hashing.

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The idea is that drivers which implement multiqueue RX
pre-seed the SKB by recording the RX queue selected by
the hardware.

If such a seed is found on TX, we'll use that to select
the outgoing TX queue.

This helps get more consistent load balancing on router
and firewall loads.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-01-27 16:22:11 -08:00
parent a73efd0a85
commit d5a9e24afb
2 changed files with 23 additions and 0 deletions
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15
include/linux/skbuff.h
View File

@ -1904,6 +1904,21 @@ static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_bu
to->queue_mapping = from->queue_mapping;
}
static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue)
{
skb->queue_mapping = rx_queue + 1;
}
static inline u16 skb_get_rx_queue(struct sk_buff *skb)
{
return skb->queue_mapping - 1;
}
static inline bool skb_rx_queue_recorded(struct sk_buff *skb)
{
return (skb->queue_mapping != 0);
}
#ifdef CONFIG_XFRM
static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
{

8
net/core/dev.c
View File

@ -1722,6 +1722,13 @@ static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
simple_tx_hashrnd_initialized = 1;
}
if (skb_rx_queue_recorded(skb)) {
u32 val = skb_get_rx_queue(skb);
hash = jhash_1word(val, simple_tx_hashrnd);
goto out;
}
switch (skb->protocol) {
case htons(ETH_P_IP):
if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
@ -1759,6 +1766,7 @@ static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);
out:
return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
}