Commit ca027a1c authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Daniel Borkmann

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: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 7fedbb7c
...@@ -157,7 +157,14 @@ nfp_bpf_cmsg_wait_reply(struct nfp_app_bpf *bpf, enum nfp_bpf_cmsg_type type, ...@@ -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),
......
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