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Commit e8d76033 authored by Subash Abhinov Kasiviswanathan's avatar Subash Abhinov Kasiviswanathan
Browse files

net: add a per-cpu counter for the number of frames coalesced in GRO 



A low cost method of determining GRO statistics is required. This
change introduces a new counter which tracks whenever GRO coalesces
ingress packets. The counter is per-CPU and exposed in
/proc/net/softnet_stat as the last column of data. No user space
impact is expected as a result of this change. However, this change
should be reverted if legacy tools have problems with the new column
in softnet_stat.

CRs-Fixed: 2156182
Change-Id: I05965c0cb150947935d5977884cc4d583b37131d
Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
parent 7bc027e5

include/linux/netdevice.h

+2 −0
Original line number Diff line number Diff line
@@ -2748,6 +2748,8 @@ struct softnet_data { 
	unsigned int		processed;

	unsigned int		time_squeeze;

	unsigned int		received_rps;

	unsigned int            gro_coalesced;



#ifdef CONFIG_RPS

	struct softnet_data	*rps_ipi_list;

#endif

net/core/dev.c

+1 −0
Original line number Diff line number Diff line
@@ -4671,6 +4671,7 @@ static int napi_gro_complete(struct sk_buff *skb) 
	}



out:

	__this_cpu_add(softnet_data.gro_coalesced, NAPI_GRO_CB(skb)->count > 1);

	return netif_receive_skb_internal(skb);

}

net/core/net-procfs.c

+6 −6
Original line number Diff line number Diff line
@@ -159,12 +159,12 @@ static int softnet_seq_show(struct seq_file *seq, void *v) 
	rcu_read_unlock();

#endif



	seq_printf(seq,

		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",

	seq_printf

	(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",

	 sd->processed, sd->dropped, sd->time_squeeze, 0,

	 0, 0, 0, 0, /* was fastroute */

	 0, /* was cpu_collision */

		   sd->received_rps, flow_limit_count);

	 sd->received_rps, flow_limit_count, sd->gro_coalesced);

	return 0;

}