af-packet: implement new load balancing modes

This patch implements the fanout load balancing modes available
in kernel 4.0. The more interesting is cluster_qm that does the
load balancing based on the RSS queues. So if the network card
is doing a flow based load balancing then a given socket will
receive all packets of a flow indepently of the CPU affinity.

src/runmode-af-packet.c

@@ -282,6 +282,19 @@ void *ParseAFPConfig(const char *iface)
         SCLogInfo("Using cpu cluster mode for AF_PACKET (iface %s)",
                 aconf->iface);
         aconf->cluster_type = PACKET_FANOUT_CPU;
+    } else if (strcmp(tmpctype, "cluster_qm") == 0) {
+        SCLogInfo("Using queue based cluster mode for AF_PACKET (iface %s)",
+                aconf->iface);
+        aconf->cluster_type = PACKET_FANOUT_QM;
+    } else if (strcmp(tmpctype, "cluster_random") == 0) {
+        SCLogInfo("Using random based cluster mode for AF_PACKET (iface %s)",
+                aconf->iface);
+        aconf->cluster_type = PACKET_FANOUT_RND;
+    } else if (strcmp(tmpctype, "cluster_rollover") == 0) {
+        SCLogInfo("Using rollover based cluster mode for AF_PACKET (iface %s)",
+                aconf->iface);
+        aconf->cluster_type = PACKET_FANOUT_ROLLOVER;
+
     } else {
         SCLogError(SC_ERR_INVALID_CLUSTER_TYPE,"invalid cluster-type %s",tmpctype);
         SCFree(aconf);

suricata.yaml.in

@@ -416,6 +416,14 @@ af-packet:
     #  * cluster_round_robin: round robin load balancing
     #  * cluster_flow: all packets of a given flow are send to the same socket
     #  * cluster_cpu: all packets treated in kernel by a CPU are send to the same socket
+    #  * cluster_qm: all packets linked by network card to a RSS queue are sent to the same
+    #  socket. Requires at least Linux 3.14.
+    #  * cluster_random: packets are sent randomly to sockets but with an equipartition.
+    #  Requires at least Linux 3.14.
+    #  * cluster_rollover: kernel rotates between sockets filling each socket before moving
+    #  to the next. Requires at least Linux 3.10.
+    # Recommended modes are cluster_flow on most boxes and cluster_cpu or cluster_qm on system
+    # with capture card using RSS (require cpu affinity tuning and system irq tuning)
     cluster-type: cluster_flow
     # In some fragmentation case, the hash can not be computed. If "defrag" is set
     # to yes, the kernel will do the needed defragmentation before sending the packets.