Commit 773fc8f6 authored by ashwanth@codeaurora.org's avatar ashwanth@codeaurora.org Committed by David S. Miller
Browse files

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: default avatarAshwanth Goli <ashwanth@codeaurora.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 33d4c482

net/core/dev.c

+22 −9
Original line number Diff line number Diff line
@@ -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);

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