net sched: use xps information for qdisc NUMA affinity

Allocate qdisc memory according to NUMA properties of cpus included in
xps map.

To be effective, qdisc should be (re)setup after changes
of /sys/class/net/eth<n>/queues/tx-<n>/xps_cpus

I added a numa_node field in struct netdev_queue, containing NUMA node
if all cpus included in xps_cpus share same node, else -1.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 1 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4b0c7f3aa32b..a9ac5dc26e3c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -508,7 +508,9 @@ struct netdev_queue {
 #ifdef CONFIG_RPS
         struct kobject          kobj;
 #endif
-
+#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
+        int                     numa_node;
+#endif
 /*
  * write mostly part
  */
@@ -523,6 +525,22 @@ struct netdev_queue {
         u64                     tx_dropped;
 } ____cacheline_aligned_in_smp;
 
+static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
+{
+#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
+        return q->numa_node;
+#else
+        return -1;
+#endif
+}
+
+static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
+{
+#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
+        q->numa_node = node;
+#endif
+}
+
 #ifdef CONFIG_RPS
 /*
  * This structure holds an RPS map which can be of variable length.  The