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net/bonding: Take IP hash logic into a helper 

Hash logic on L3 will be used in a downstream patch for one more use
case.
Take it to a function for a better code reuse.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Boris Pismenny <borisp@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tariq Toukan 2021-01-17 16:59:43 +02:00 committed by Jakub Kicinski
parent 719a402cf6
commit 5b99854540
1 changed files with 11 additions and 5 deletions
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16
drivers/net/bonding/bond_main.c
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@ -3541,6 +3541,16 @@ static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
return true;
}
static u32 bond_ip_hash(u32 hash, struct flow_keys *flow)
{
hash ^= (__force u32)flow_get_u32_dst(flow) ^
(__force u32)flow_get_u32_src(flow);
hash ^= (hash >> 16);
hash ^= (hash >> 8);
/* discard lowest hash bit to deal with the common even ports pattern */
return hash >> 1;
}
/**
* bond_xmit_hash - generate a hash value based on the xmit policy
* @bond: bonding device
@ -3571,12 +3581,8 @@ u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
else
memcpy(&hash, &flow.ports.ports, sizeof(hash));
}
hash ^= (__force u32)flow_get_u32_dst(&flow) ^
(__force u32)flow_get_u32_src(&flow);
hash ^= (hash >> 16);
hash ^= (hash >> 8);
return hash >> 1;
return bond_ip_hash(hash, &flow);
}
/*-------------------------- Device entry points ----------------------------*/