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author | Govindarajulu Varadarajan <_govind@gmx.com> | 2015-06-25 16:02:04 +0530 |
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committer | David S. Miller <davem@davemloft.net> | 2015-06-25 05:23:01 -0700 |
commit | f586a3360197a63b5423001553ab23025242ac72 (patch) | |
tree | ed012c1c5ee31e5ca37ccbfe55678ae9bf055b64 /net | |
parent | 1298267b548a78840bd4b3e030993ff8747ca5e6 (diff) |
enic: use atomic_t instead of spin_lock in busy poll
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>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions