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| author | Magnus Karlsson <magnus.karlsson@intel.com> | 2018-06-04 13:57:15 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-06-04 17:21:02 +0200 |
| commit | a65ea68b8dd92fea86d2b8ca7e43caeaa5ddcdff (patch) | |
| tree | c915daf95767b0497f4fbe65c4647a44ba5b69e2 | |
| parent | a412ef54fc2eb81bb55428dcdcdaa2e38ae9bba5 (diff) | |
| download | linux-a65ea68b8dd92fea86d2b8ca7e43caeaa5ddcdff.tar.gz | |
samples/bpf: minor *_nb_free performance fix
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
| -rw-r--r-- | samples/bpf/xdpsock_user.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index b71a342b9082..7494f60fbff8 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -157,15 +157,15 @@ static const char pkt_data[] = static inline u32 umem_nb_free(struct xdp_umem_uqueue *q, u32 nb) { - u32 free_entries = q->size - (q->cached_prod - q->cached_cons); + u32 free_entries = q->cached_cons - q->cached_prod; if (free_entries >= nb) return free_entries; /* Refresh the local tail pointer */ - q->cached_cons = *q->consumer; + q->cached_cons = *q->consumer + q->size; - return q->size - (q->cached_prod - q->cached_cons); + return q->cached_cons - q->cached_prod; } static inline u32 xq_nb_free(struct xdp_uqueue *q, u32 ndescs) @@ -439,6 +439,7 @@ static struct xdp_umem *xdp_umem_configure(int sfd) umem->fq.producer = umem->fq.map + off.fr.producer; umem->fq.consumer = umem->fq.map + off.fr.consumer; umem->fq.ring = umem->fq.map + off.fr.desc; + umem->fq.cached_cons = FQ_NUM_DESCS; umem->cq.map = mmap(0, off.cr.desc + CQ_NUM_DESCS * sizeof(u64), @@ -535,6 +536,7 @@ static struct xdpsock *xsk_configure(struct xdp_umem *umem) xsk->tx.producer = xsk->tx.map + off.tx.producer; xsk->tx.consumer = xsk->tx.map + off.tx.consumer; xsk->tx.ring = xsk->tx.map + off.tx.desc; + xsk->tx.cached_cons = NUM_DESCS; sxdp.sxdp_family = PF_XDP; sxdp.sxdp_ifindex = opt_ifindex; |