diff options
| author | Govindarajulu Varadarajan <_govind@gmx.com> | 2015-06-25 13:32:04 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-25 15:23:01 +0300 |
| commit | f586a3360197a63b5423001553ab23025242ac72 (patch) | |
| tree | ed012c1c5ee31e5ca37ccbfe55678ae9bf055b64 /drivers/net/ethernet/cisco/enic/enic_main.c | |
| parent | 1298267b548a78840bd4b3e030993ff8747ca5e6 (diff) | |
| download | linux-f586a3360197a63b5423001553ab23025242ac72.tar.xz | |
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 'drivers/net/ethernet/cisco/enic/enic_main.c')
| -rw-r--r-- | drivers/net/ethernet/cisco/enic/enic_main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c index eadae1b412c6..da2004e2a741 100644 --- a/drivers/net/ethernet/cisco/enic/enic_main.c +++ b/drivers/net/ethernet/cisco/enic/enic_main.c @@ -1208,7 +1208,7 @@ static int enic_poll(struct napi_struct *napi, int budget) napi_complete(napi); vnic_intr_unmask(&enic->intr[intr]); } - enic_poll_unlock_napi(&enic->rq[cq_rq]); + enic_poll_unlock_napi(&enic->rq[cq_rq], napi); return rq_work_done; } @@ -1414,7 +1414,7 @@ static int enic_poll_msix_rq(struct napi_struct *napi, int budget) */ enic_calc_int_moderation(enic, &enic->rq[rq]); - enic_poll_unlock_napi(&enic->rq[rq]); + enic_poll_unlock_napi(&enic->rq[rq], napi); if (work_done < work_to_do) { /* Some work done, but not enough to stay in polling, |