[dpdk-dev] [PATCH] net/mlx5: fix miniCQE configuration for Verbs

Alexander Kozyrev akozyrev at nvidia.com
Mon Feb 1 18:16:30 CET 2021

Verbs cannot be used to configure newly introduced miniCQE formats for
Flow Tag and L3/L4 Header compression. Support for these formats has
been added to the DevX configuration only. And the RX queue descriptor
has been updated with the CQE compression format information only as
well. But the datapath relies on this info no matter which method is
used for Rx queues configuration. Set proper CQE compression format
information in the Verbs configuration to fix the miniCQE parsing logic.

Cc: stable at dpdk.org
Fixes: 54c2d46b16 ("net/mlx5: support flow tag and packet header miniCQEs")

Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>
 doc/guides/nics/mlx5.rst            |  6 +++++-
 drivers/net/mlx5/linux/mlx5_verbs.c | 17 +++++++++++++----
 drivers/net/mlx5/mlx5_rxtx.h        |  2 +-
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index e99fea4342..7d7f4abd8f 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -485,13 +485,17 @@ Driver options
   A nonzero value enables the compression of CQE on RX side. This feature
   allows to save PCI bandwidth and improve performance. Enabled by default.
   Different compression formats are supported in order to achieve the best
-  performance for different traffic patterns. Hash RSS format is the default.
+  performance for different traffic patterns. Default format depends on
+  Multi-Packet Rx queue configuration: Hash RSS format is used in case
+  MPRQ is disabled, Checksum format is used in case MPRQ is enabled.
   Specifying 2 as a ``rxq_cqe_comp_en`` value selects Flow Tag format for
   better compression rate in case of RTE Flow Mark traffic.
   Specifying 3 as a ``rxq_cqe_comp_en`` value selects Checksum format.
   Specifying 4 as a ``rxq_cqe_comp_en`` value selects L3/L4 Header format for
   better compression rate in case of mixed TCP/UDP and IPv4/IPv6 traffic.
+  CQE compression format selection requires DevX to be enabled. If there is
+  no DevX enabled/supported the value is reset to 1 by default.
   Supported on:
diff --git a/drivers/net/mlx5/linux/mlx5_verbs.c b/drivers/net/mlx5/linux/mlx5_verbs.c
index 43ff85f9c4..ade241b806 100644
--- a/drivers/net/mlx5/linux/mlx5_verbs.c
+++ b/drivers/net/mlx5/linux/mlx5_verbs.c
@@ -213,13 +213,22 @@ mlx5_rxq_ibv_cq_create(struct rte_eth_dev *dev, uint16_t idx)
 	if (priv->config.cqe_comp && !rxq_data->hw_timestamp) {
 		cq_attr.mlx5.comp_mask |=
+		rxq_data->byte_mask = UINT32_MAX;
-		cq_attr.mlx5.cqe_comp_res_format =
-				mlx5_rxq_mprq_enabled(rxq_data) ?
+		if (mlx5_rxq_mprq_enabled(rxq_data)) {
+			cq_attr.mlx5.cqe_comp_res_format =
+			rxq_data->mcqe_format =
+		} else {
+			cq_attr.mlx5.cqe_comp_res_format =
+			rxq_data->mcqe_format =
+		}
 		cq_attr.mlx5.cqe_comp_res_format = MLX5DV_CQE_RES_FORMAT_HASH;
+		rxq_data->mcqe_format = MLX5_CQE_RESP_FORMAT_HASH;
 		 * For vectorized Rx, it must not be doubled in order to
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 6432030e90..0fd98af9d1 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -126,7 +126,7 @@ struct mlx5_rxq_data {
 	unsigned int strd_scatter_en:1; /* Scattered packets from a stride. */
 	unsigned int lro:1; /* Enable LRO. */
 	unsigned int dynf_meta:1; /* Dynamic metadata is configured. */
-	unsigned int mcqe_format:3; /* Dynamic metadata is configured. */
+	unsigned int mcqe_format:3; /* CQE compression format. */
 	volatile uint32_t *rq_db;
 	volatile uint32_t *cq_db;
 	uint16_t port_id;

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