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nfp: bpf: add short busy wait for FW replies 

Scheduling out and in for every FW message can slow us down
unnecessarily.  Our experiments show that even under heavy load
the FW responds to 99.9% messages within 200 us.  Add a short
busy wait before entering the wait queue.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-01-17 19:13:32 -08:00 committed by Daniel Borkmann
parent 7fedbb7c5a
commit ca027a1c45
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
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@ -157,7 +157,14 @@ nfp_bpf_cmsg_wait_reply(struct nfp_app_bpf *bpf, enum nfp_bpf_cmsg_type type,
int tag)
{
struct sk_buff *skb;
int err;
int i, err;
for (i = 0; i < 50; i++) {
udelay(4);
skb = nfp_bpf_reply(bpf, tag);
if (skb)
return skb;
}
err = wait_event_interruptible_timeout(bpf->cmsg_wq,
skb = nfp_bpf_reply(bpf, tag),