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authorDaniel Borkmann <dborkman@redhat.com>2013-08-28 22:13:09 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-29 16:43:29 -0400
commit5df0ddfbc9209ffafc82236509ba0e975120e3c3 (patch)
treeab8278af886022f052045a6c5c941df51006c305
parent488594883e25cc6e40df067a9a7b39737ebb18d8 (diff)
downloadop-kernel-dev-5df0ddfbc9209ffafc82236509ba0e975120e3c3.zip
op-kernel-dev-5df0ddfbc9209ffafc82236509ba0e975120e3c3.tar.gz
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.h1
-rw-r--r--net/packet/af_packet.c13
2 files changed, 13 insertions, 1 deletions
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index b950c02..dbf0666 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 1fdf9ab..bee9bfd 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;
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