[Intel-wired-lan] [RFC PATCH bpf-next 09/12] samples/bpf: minor *_nb_free performance fix
Björn Töpel
bjorn.topel at gmail.com
Tue May 15 19:06:12 UTC 2018
From: Magnus Karlsson <magnus.karlsson at intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson at intel.com>
---
samples/bpf/xdpsock_user.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 7fe60f6f7d53..50b9cabba4e8 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -159,15 +159,15 @@ 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->ring->ptrs.consumer;
+ q->cached_cons = q->ring->ptrs.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)
@@ -432,6 +432,7 @@ static struct xdp_umem *xdp_umem_configure(int sfd)
umem->fq.mask = FQ_NUM_DESCS - 1;
umem->fq.size = FQ_NUM_DESCS;
+ umem->fq.cached_cons = FQ_NUM_DESCS;
umem->cq.ring = mmap(0, sizeof(struct xdp_umem_ring) +
CQ_NUM_DESCS * sizeof(u32),
@@ -514,6 +515,7 @@ static struct xdpsock *xsk_configure(struct xdp_umem *umem)
xsk->tx.mask = NUM_DESCS - 1;
xsk->tx.size = NUM_DESCS;
+ xsk->tx.cached_cons = NUM_DESCS;
sxdp.sxdp_family = PF_XDP;
sxdp.sxdp_ifindex = opt_ifindex;
--
2.14.1
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