diff options
| author | Daniel Borkmann <dborkman@redhat.com> | 2013-08-28 22:13:09 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-29 16:43:29 -0400 |
| commit | 5df0ddfbc9209ffafc82236509ba0e975120e3c3 (patch) | |
| tree | ab8278af886022f052045a6c5c941df51006c305 | |
| parent | 488594883e25cc6e40df067a9a7b39737ebb18d8 (diff) | |
net: packet: add randomized fanout scheduler
We currently allow for different fanout scheduling policies in pf_packet
such as scheduling by skb's rxhash, round-robin, by cpu, and rollover.
Also allow for a random, equidistributed selection of the socket from the
fanout process group.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/uapi/linux/if_packet.h | 1 | ||||
| -rw-r--r-- | net/packet/af_packet.c | 13 |
2 files changed, 13 insertions, 1 deletions
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h index b950c02030c0..dbf06667394b 100644 --- a/include/uapi/linux/if_packet.h +++ b/include/uapi/linux/if_packet.h @@ -56,6 +56,7 @@ struct sockaddr_ll { #define PACKET_FANOUT_LB 1 #define PACKET_FANOUT_CPU 2 #define PACKET_FANOUT_ROLLOVER 3 +#define PACKET_FANOUT_RND 4 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 1fdf9ab91c3f..bee9bfdc8d05 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -88,7 +88,7 @@ #include <linux/virtio_net.h> #include <linux/errqueue.h> #include <linux/net_tstamp.h> - +#include <linux/reciprocal_div.h> #ifdef CONFIG_INET #include <net/inet_common.h> #endif @@ -1158,6 +1158,13 @@ static unsigned int fanout_demux_cpu(struct packet_fanout *f, return smp_processor_id() % num; } +static unsigned int fanout_demux_rnd(struct packet_fanout *f, + struct sk_buff *skb, + unsigned int num) +{ + return reciprocal_divide(prandom_u32(), num); +} + static unsigned int fanout_demux_rollover(struct packet_fanout *f, struct sk_buff *skb, unsigned int idx, unsigned int skip, @@ -1215,6 +1222,9 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, case PACKET_FANOUT_CPU: idx = fanout_demux_cpu(f, skb, num); break; + case PACKET_FANOUT_RND: + idx = fanout_demux_rnd(f, skb, num); + break; case PACKET_FANOUT_ROLLOVER: idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num); break; @@ -1284,6 +1294,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags) case PACKET_FANOUT_HASH: case PACKET_FANOUT_LB: case PACKET_FANOUT_CPU: + case PACKET_FANOUT_RND: break; default: return -EINVAL; |