[PATCH 18/25] crypto/cnxk: fix inflight cnt calculation
From: Anoob Joseph <hidden>
Date: 2021-12-07 06:53:07
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
Inflight count calculation is updated to cover wrap around cases where head can become smaller than tail. Reported-by: Kiran Kumar K <redacted> Signed-off-by: Anoob Joseph <redacted> --- drivers/crypto/cnxk/cnxk_cryptodev_ops.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/cnxk/cnxk_cryptodev_ops.h b/drivers/crypto/cnxk/cnxk_cryptodev_ops.h
index ca363bb..0336ae1 100644
--- a/drivers/crypto/cnxk/cnxk_cryptodev_ops.h
+++ b/drivers/crypto/cnxk/cnxk_cryptodev_ops.h@@ -156,7 +156,11 @@ pending_queue_retreat(uint64_t *index, const uint64_t mask, uint64_t nb_entry) static __rte_always_inline uint64_t pending_queue_infl_cnt(uint64_t head, uint64_t tail, const uint64_t mask) { - return (head - tail) & mask; + /* + * Mask is nb_desc - 1. Add nb_desc to head and mask to account for + * cases when tail > head, which happens during wrap around. + */ + return ((head + mask + 1) - tail) & mask; } static __rte_always_inline uint64_t
--
2.7.4