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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>
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@ -60,6 +60,7 @@ struct sockaddr_ll {
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#define PACKET_FANOUT_CPU 2
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#define PACKET_FANOUT_ROLLOVER 3
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#define PACKET_FANOUT_RND 4
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#define PACKET_FANOUT_QM 5
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#define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
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#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
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@ -1312,6 +1312,13 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
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return idx;
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}
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static unsigned int fanout_demux_qm(struct packet_fanout *f,
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struct sk_buff *skb,
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unsigned int num)
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{
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return skb_get_queue_mapping(skb) % num;
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}
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static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
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{
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return f->flags & (flag >> 8);
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@ -1351,6 +1358,9 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
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case PACKET_FANOUT_RND:
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idx = fanout_demux_rnd(f, skb, num);
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break;
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case PACKET_FANOUT_QM:
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idx = fanout_demux_qm(f, skb, num);
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break;
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case PACKET_FANOUT_ROLLOVER:
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idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num);
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break;
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@ -1421,6 +1431,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
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case PACKET_FANOUT_LB:
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case PACKET_FANOUT_CPU:
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case PACKET_FANOUT_RND:
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case PACKET_FANOUT_QM:
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break;
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default:
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return -EINVAL;
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