net: rps: send out pending IPI's on CPU hotplug

IPI's from the victim cpu are not handled in dev_cpu_callback.
So these pending IPI's would be sent to the remote cpu only when
NET_RX is scheduled on the victim cpu and since this trigger is
unpredictable it would result in packet latencies on the remote cpu.

This patch add support to send the pending ipi's of victim cpu.

Signed-off-by: Ashwanth Goli <ashwanth@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 4c15466305c3a032c12eebb183e8992ce69ac2b7..54bb8d99d26afcc1a9c5a56f1e8c2d1f6e06db98 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4949,6 +4949,19 @@ __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(__skb_gro_checksum_complete);
 
+static void net_rps_send_ipi(struct softnet_data *remsd)
+{
+#ifdef CONFIG_RPS
+       while (remsd) {
+               struct softnet_data *next = remsd->rps_ipi_next;
+
+               if (cpu_online(remsd->cpu))
+                       smp_call_function_single_async(remsd->cpu, &remsd->csd);
+               remsd = next;
+       }
+#endif
+}
+
 /*
  * net_rps_action_and_irq_enable sends any pending IPI's for rps.
  * Note: called with local irq disabled, but exits with local irq enabled.
@@ -4964,14 +4977,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
                local_irq_enable();
 
                /* Send pending IPI's to kick RPS processing on remote cpus. */
-               while (remsd) {
-                       struct softnet_data *next = remsd->rps_ipi_next;
-
-                       if (cpu_online(remsd->cpu))
-                               smp_call_function_single_async(remsd->cpu,
-                                                          &remsd->csd);
-                       remsd = next;
-               }
+               net_rps_send_ipi(remsd);
        } else
 #endif
                local_irq_enable();
@@ -8197,7 +8203,7 @@ static int dev_cpu_dead(unsigned int oldcpu)
        struct sk_buff **list_skb;
        struct sk_buff *skb;
        unsigned int cpu;
-       struct softnet_data *sd, *oldsd;
+       struct softnet_data *sd, *oldsd, *remsd;
 
        local_irq_disable();
        cpu = smp_processor_id();
@@ -8238,6 +8244,13 @@ static int dev_cpu_dead(unsigned int oldcpu)
        raise_softirq_irqoff(NET_TX_SOFTIRQ);
        local_irq_enable();
 
+#ifdef CONFIG_RPS
+       remsd = oldsd->rps_ipi_list;
+       oldsd->rps_ipi_list = NULL;
+#endif
+       /* send out pending IPI's on offline CPU */
+       net_rps_send_ipi(remsd);
+
        /* Process offline CPU's input_pkt_queue */
        while ((skb = __skb_dequeue(&oldsd->process_queue))) {
                netif_rx_ni(skb);