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authorNeil Horman <nhorman@tuxdriver.com>2014-01-22 16:01:44 -0500
committerDavid S. Miller <davem@davemloft.net>2014-01-22 17:35:50 -0800
commit2d36097d26b5991d71a2cf4a20c1a158f0f1bfcd (patch)
tree86ad219b1481a17780efec984c314e1b0f6bc87e /net/packet
parentb414ac9a3ea8a547e4a413160d36bffefb2ba5c7 (diff)
downloadlinux-2d36097d26b5991d71a2cf4a20c1a158f0f1bfcd.tar.bz2
af_packet: Add Queue mapping mode to af_packet fanout operation
This patch adds a queue mapping mode to the fanout operation of af_packet sockets. This allows user space af_packet users to better filter on flows ingressing and egressing via a specific hardware queue, and avoids the potential packet reordering that can occur when FANOUT_CPU is being used and irq affinity varies. Tested successfully by myself. applies to net-next Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: "David S. Miller" <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 97346162803d..6a2bb37506c5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1312,6 +1312,13 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
return idx;
}
+static unsigned int fanout_demux_qm(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
+{
+ return skb_get_queue_mapping(skb) % num;
+}
+
static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
{
return f->flags & (flag >> 8);
@@ -1351,6 +1358,9 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
case PACKET_FANOUT_RND:
idx = fanout_demux_rnd(f, skb, num);
break;
+ case PACKET_FANOUT_QM:
+ idx = fanout_demux_qm(f, skb, num);
+ break;
case PACKET_FANOUT_ROLLOVER:
idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num);
break;
@@ -1421,6 +1431,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
case PACKET_FANOUT_LB:
case PACKET_FANOUT_CPU:
case PACKET_FANOUT_RND:
+ case PACKET_FANOUT_QM:
break;
default:
return -EINVAL;