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nfp: bpf: add short busy wait for FW replies

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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) int tag)
{ {
struct sk_buff *skb; 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, err = wait_event_interruptible_timeout(bpf->cmsg_wq,
skb = nfp_bpf_reply(bpf, tag), skb = nfp_bpf_reply(bpf, tag),