+++ /dev/null
-From 3e969c9695b45e1a052d43b367096ec99f2f0aac Mon Sep 17 00:00:00 2001
-From: John Crispin <john@phrozen.org>
-Date: Thu, 10 Aug 2017 15:58:29 +0200
-Subject: [PATCH] net: core: add RPS balancer
-
-This patch adds a hash bucket based rps hash balancer.
-
-Signed-off-by: John Crispin <john@phrozen.org>
----
- net/core/dev.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
- 1 file changed, 56 insertions(+), 1 deletion(-)
-
---- a/net/core/dev.c
-+++ b/net/core/dev.c
-@@ -3626,6 +3626,58 @@ set_rps_cpu(struct net_device *dev, stru
- return rflow;
- }
-
-+#define RPS_TBL_SIZE_SHIFT 10
-+#define RPS_TBL_SIZE (1 << RPS_TBL_SIZE_SHIFT)
-+struct rps_table {
-+ int core;
-+ struct timer_list expire;
-+};
-+static struct rps_table rps_table[RPS_TBL_SIZE];
-+static int rps_table_last_core;
-+
-+static void rps_table_expire(unsigned long data)
-+{
-+ struct rps_table *entry = (struct rps_table *) data;
-+
-+ entry->core = -1;
-+}
-+
-+static int rps_table_core(struct rps_map *map)
-+{
-+ int i;
-+
-+ for (i = 0; i < map->len; i++) {
-+ int cpu = map->cpus[(rps_table_last_core + i + 1) % map->len];
-+ if (cpu_online(cpu)) {
-+ rps_table_last_core = cpu;
-+ return cpu;
-+ }
-+ }
-+ return map->cpus[0];
-+}
-+
-+static int rps_table_lookup(struct rps_map *map, u32 hash)
-+{
-+ int bucket = hash & 0x3ff;
-+
-+ if (rps_table[bucket].core < 0)
-+ rps_table[bucket].core = rps_table_core(map);
-+ mod_timer(&rps_table[bucket].expire, jiffies + HZ);
-+
-+ return rps_table[bucket].core;
-+}
-+
-+static void rps_table_init(void)
-+{
-+ int i;
-+
-+ for (i = 0; i < RPS_TBL_SIZE; i++) {
-+ rps_table[i].core = -1;
-+ setup_timer(&rps_table[i].expire, rps_table_expire,
-+ (unsigned long) &rps_table[i]);
-+ }
-+}
-+
- /*
- * get_rps_cpu is called from netif_receive_skb and returns the target
- * CPU from the RPS map of the receiving queue for a given skb.
-@@ -3715,7 +3767,7 @@ static int get_rps_cpu(struct net_device
- try_rps:
-
- if (map) {
-- tcpu = map->cpus[reciprocal_scale(hash, map->len)];
-+ tcpu = rps_table_lookup(map, hash);
- if (cpu_online(tcpu)) {
- cpu = tcpu;
- goto done;
-@@ -8800,6 +8852,10 @@ static int __init net_dev_init(void)
- sd->backlog.weight = weight_p;
- }
-
-+#ifdef CONFIG_RPS
-+ rps_table_init();
-+#endif
-+
- dev_boot_phase = 0;
-
- /* The loopback device is special if any other network devices
projects / openwrt / staging / hauke.git / commitdiff