diff options
| author | Ido Schimmel <idosch@OSS.NVIDIA.COM> | 2021-05-17 20:15:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-05-18 22:27:32 +0200 |
| commit | ce5c9c20d364f156c885efed8c71fca2945db00f (patch) | |
| tree | bb4858afb789ab04d7330dc3bff07f999814bbff /net/ipv4/fib_frontend.c | |
| parent | ipv4: Calculate multipath hash inside switch statement (diff) | |
| download | linux-ce5c9c20d364f156c885efed8c71fca2945db00f.tar.xz linux-ce5c9c20d364f156c885efed8c71fca2945db00f.zip | |
ipv4: Add a sysctl to control multipath hash fields
A subsequent patch will add a new multipath hash policy where the packet
fields used for multipath hash calculation are determined by user space.
This patch adds a sysctl that allows user space to set these fields.
The packet fields are represented using a bitmask and are common between
IPv4 and IPv6 to allow user space to use the same numbering across both
protocols. For example, to hash based on standard 5-tuple:
# sysctl -w net.ipv4.fib_multipath_hash_fields=0x0037
net.ipv4.fib_multipath_hash_fields = 0x0037
The kernel rejects unknown fields, for example:
# sysctl -w net.ipv4.fib_multipath_hash_fields=0x1000
sysctl: setting key "net.ipv4.fib_multipath_hash_fields": Invalid argument
More fields can be added in the future, if needed.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
| -rw-r--r-- | net/ipv4/fib_frontend.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index bfb345c88271..af8814a11378 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -1514,6 +1514,12 @@ static int __net_init ip_fib_net_init(struct net *net) if (err) return err; +#ifdef CONFIG_IP_ROUTE_MULTIPATH + /* Default to 3-tuple */ + net->ipv4.sysctl_fib_multipath_hash_fields = + FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK; +#endif + /* Avoid false sharing : Use at least a full cache line */ size = max_t(size_t, size, L1_CACHE_BYTES); |