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From: Maxime Leroy <maxime.leroy@6wind.com>
To: Matan Azrad <matan@nvidia.com>,
	Shahaf Shuler <shahafs@nvidia.com>,
	Viacheslav Ovsiienko <viacheslavo@nvidia.com>,
	Olivier Matz <olivier.matz@6wind.com>
Cc: dev@dpdk.org, Didier Pallard <didier.pallard@6wind.com>
Subject: [dpdk-dev] [PATCH v4 2/2] net/mlx5: fix Rx descriptor status returned value
Date: Tue, 17 Nov 2020 12:26:47 +0100
Message-ID: <20201117112648.29725-3-maxime.leroy@6wind.com> (raw)
In-Reply-To: <20201117112648.29725-1-maxime.leroy@6wind.com>

From: Didier Pallard <didier.pallard@6wind.com>

Three 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.
- The number of cqes is equals to (1U << rxq->elts_n) - 1 in SPRQ mode.
  The range returned by rx_queue_count should be the number of entries
  used in queue, so it ranges from 0 to max number of entries
  in queue, not this number minus one.
- For MPRQ mode, we need to take into account of the number of strd.

Fixes: 8788fec1f269 ("net/mlx5: implement descriptor status API")
Signed-off-by: Didier Pallard <didier.pallard@6wind.com>
Signed-off-by: Maxime Leroy <maxime.leroy@6wind.com>
 drivers/net/mlx5/mlx5_rxtx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 2733dcd3..2ecf901f 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -463,6 +463,9 @@ rx_queue_count(struct mlx5_rxq_data *rxq)
 	struct rxq_zip *zip = &rxq->zip;
 	volatile struct mlx5_cqe *cqe;
 	const unsigned int cqe_n = (1 << rxq->cqe_n);
+	const unsigned int sges_n = (1 << rxq->sges_n);
+	const unsigned int elts_n = (1 << rxq->elts_n);
+	const unsigned int strd_n = (1 << rxq->strd_num_n);
 	const unsigned int cqe_cnt = cqe_n - 1;
 	unsigned int cq_ci, used;
@@ -488,7 +491,7 @@ rx_queue_count(struct mlx5_rxq_data *rxq)
 		used += n;
 		cqe = &(*rxq->cqes)[cq_ci & cqe_cnt];
-	used = RTE_MIN(used, cqe_n);
+	used = RTE_MIN(used * sges_n, elts_n * strd_n);
 	return used;

  parent reply	other threads:[~2020-11-17 11:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-17 11:26 [dpdk-dev] [PATCH v4 0/2] net/mlx5: fixes for rx queue count calculation Maxime Leroy
2020-11-17 11:26 ` [dpdk-dev] [PATCH v4 1/2] net/mlx5: fix Rx " Maxime Leroy
2020-11-17 12:06   ` Slava Ovsiienko
2020-11-17 11:26 ` Maxime Leroy [this message]
2020-11-17 12:05   ` [dpdk-dev] [PATCH v4 2/2] net/mlx5: fix Rx descriptor status returned value Slava Ovsiienko
2020-11-17 13:48 ` [dpdk-dev] [PATCH v4 0/2] net/mlx5: fixes for rx queue count calculation Raslan Darawsheh

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