enic: use atomic_t instead of spin_lock in busy poll

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We use spinlock to access a single flag. We can avoid spin_locks by using
atomic variable and atomic_cmpxchg(). Use atomic_cmpxchg to set the flag
for idle to poll. And a simple atomic_set to unlock (set idle from poll).

In napi poll, if gro is enabled, we call napi_gro_receive() to deliver the
packets. Before we call napi_complete(), i.e while re-polling, if low
latency busy poll is called, we use netif_receive_skb() to deliver the packets.
At this point if there are some skb's held in GRO, busy poll could deliver the
packets out of order. So we call napi_gro_flush() to flush skbs before we
move the napi poll to idle.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Govindarajulu Varadarajan 2015-06-25 16:02:04 +05:30 • committed by David S. Miller

parent 1298267b54

commit f586a33601

2 changed files with 29 additions and 66 deletions

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4

drivers/net/ethernet/cisco/enic/enic_main.c

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91

drivers/net/ethernet/cisco/enic/vnic_rq.h

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