From: Martin KaFai Lau <kafai@fb.com>
Date: Fri, 16 Jan 2015 18:11:00 +0000 (-0800)
Subject: ip_tunnel: Create percpu gro_cell
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~134^2~176
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88340160f3ad22401b00f4efcee44f7ec4769b19;p=pandora-kernel.git

ip_tunnel: Create percpu gro_cell

In the ipip tunnel, the skb->queue_mapping is lost in ipip_rcv().
All skb will be queued to the same cell->napi_skbs.  The
gro_cell_poll is pinned to one core under load.  In production traffic,
we also see severe rx_dropped in the tunl iface and it is probably due to
this limit: skb_queue_len(&cell->napi_skbs) > netdev_max_backlog.

This patch is trying to alloc_percpu(struct gro_cell) and schedule
gro_cell_poll to process the skb in the same core.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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