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From: Didier Pallard <didier.pallard@6wind.com>
To: dev@dpdk.org
Cc: stable@dpdk.org
Subject: [dpdk-stable] [PATCH] net/mlx5: fix Rx descriptor status returned value
Date: Fri, 13 Mar 2020 10:56:59 +0100
Message-ID: <20200313095659.19000-1-didier.pallard@6wind.com> (raw)

Two bugs in rx_queue_count function:
- One entry may contain several segments, so 'used' must be multiplied
  by number of segments per entry to properly reflect the queue usage.
- rx_queue_count returns the number of entries used in queue, so it ranges
  from 0 to max number of entries in queue, not this number minus
  one.

Fixes: 8788fec1f269 ("net/mlx5: implement descriptor status API")
Cc: stable@dpdk.org
Signed-off-by: Didier Pallard <didier.pallard@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 5ac63da8039d..17f80c25443e 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -500,7 +500,7 @@ rx_queue_count(struct mlx5_rxq_data *rxq)
 		used += n;
 		cqe = &(*rxq->cqes)[cq_ci & cqe_cnt];
 	}
-	used = RTE_MIN(used, (1U << rxq->elts_n) - 1);
+	used = RTE_MIN(used * (1 << rxq->sges_n), 1U << rxq->elts_n);
 	return used;
 }
 
-- 
2.24.1


             reply	other threads:[~2020-03-13  9:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  9:56 Didier Pallard [this message]
2020-03-16 16:05 ` [dpdk-stable] [dpdk-dev] " Slava Ovsiienko
2020-03-16 17:24   ` Didier Pallard
2020-03-17  8:33     ` Slava Ovsiienko
2020-03-17  9:19       ` Didier Pallard
2020-03-17  9:25         ` Slava Ovsiienko
2020-03-17  9:41           ` Didier Pallard
2020-10-29 11:29           ` Didier Pallard

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