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Acked-by: Viacheslav Ovsiienko > -----Original Message----- > From: Igor Gutorov > Sent: Wednesday, August 7, 2024 11:44 PM > To: dev@dpdk.org > Cc: Igor Gutorov ; stable@dpdk.org > Subject: [PATCH v3 1/2] net/mlx5: fix reported Rx/Tx desc limits >=20 > Currently, `rte_eth_dev_info.rx_desc_lim.nb_max` as well as > `rte_eth_dev_info.tx_desc_lim.nb_max` shows 65535 as the limit, which > results in a few problems: >=20 > * It is not the actual Rx/Tx queue limit > * Allocating an Rx queue and passing `rx_desc_lim.nb_max` results in an > integer overflow and 0 ring size: >=20 > ``` > rte_eth_rx_queue_setup(0, 0, rx_desc_lim.nb_max, 0, NULL, mb_pool); ``` >=20 > Which overflows ring size and generates the following log: > ``` > mlx5_net: port 0 increased number of descriptors in Rx queue 0 to the nex= t > power of two (0) ``` The same holds for allocating a Tx queue. >=20 > Fixes: e60fbd5b24fc ("mlx5: add device configure/start/stop") > Cc: stable@dpdk.org >=20 > Signed-off-by: Igor Gutorov > --- > drivers/common/mlx5/mlx5_devx_cmds.c | 1 + > drivers/common/mlx5/mlx5_devx_cmds.h | 1 + > drivers/net/mlx5/mlx5_ethdev.c | 4 ++++ > drivers/net/mlx5/mlx5_rxq.c | 8 ++++++++ > drivers/net/mlx5/mlx5_txq.c | 8 ++++++++ > 5 files changed, 22 insertions(+) >=20 > diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c > b/drivers/common/mlx5/mlx5_devx_cmds.c > index 9710dcedd3..a75f011750 100644 > --- a/drivers/common/mlx5/mlx5_devx_cmds.c > +++ b/drivers/common/mlx5/mlx5_devx_cmds.c > @@ -1027,6 +1027,7 @@ mlx5_devx_cmd_query_hca_attr(void *ctx, > attr->log_max_qp =3D MLX5_GET(cmd_hca_cap, hcattr, log_max_qp); > attr->log_max_cq_sz =3D MLX5_GET(cmd_hca_cap, hcattr, > log_max_cq_sz); > attr->log_max_qp_sz =3D MLX5_GET(cmd_hca_cap, hcattr, > log_max_qp_sz); > + attr->log_max_wq_sz =3D MLX5_GET(cmd_hca_cap, hcattr, > log_max_wq_sz); > attr->log_max_mrw_sz =3D MLX5_GET(cmd_hca_cap, hcattr, > log_max_mrw_sz); > attr->log_max_pd =3D MLX5_GET(cmd_hca_cap, hcattr, log_max_pd); > attr->log_max_srq =3D MLX5_GET(cmd_hca_cap, hcattr, log_max_srq); > diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h > b/drivers/common/mlx5/mlx5_devx_cmds.h > index 6cf7999c46..2ad9e5414f 100644 > --- a/drivers/common/mlx5/mlx5_devx_cmds.h > +++ b/drivers/common/mlx5/mlx5_devx_cmds.h > @@ -267,6 +267,7 @@ struct mlx5_hca_attr { > struct mlx5_hca_flow_attr flow; > struct mlx5_hca_flex_attr flex; > struct mlx5_hca_crypto_mmo_attr crypto_mmo; > + uint8_t log_max_wq_sz; > int log_max_qp_sz; > int log_max_cq_sz; > int log_max_qp; > diff --git a/drivers/net/mlx5/mlx5_ethdev.c > b/drivers/net/mlx5/mlx5_ethdev.c index 6a678d6dcc..cac55f7a72 100644 > --- a/drivers/net/mlx5/mlx5_ethdev.c > +++ b/drivers/net/mlx5/mlx5_ethdev.c > @@ -359,6 +359,10 @@ mlx5_dev_infos_get(struct rte_eth_dev *dev, > struct rte_eth_dev_info *info) > info->flow_type_rss_offloads =3D ~MLX5_RSS_HF_MASK; > mlx5_set_default_params(dev, info); > mlx5_set_txlimit_params(dev, info); > + info->rx_desc_lim.nb_max =3D > + 1 << priv->sh->cdev->config.hca_attr.log_max_wq_sz; > + info->tx_desc_lim.nb_max =3D > + 1 << priv->sh->cdev->config.hca_attr.log_max_wq_sz; > if (priv->sh->cdev->config.hca_attr.mem_rq_rmp && > priv->obj_ops.rxq_obj_new =3D=3D devx_obj_ops.rxq_obj_new) > info->dev_capa |=3D RTE_ETH_DEV_CAPA_RXQ_SHARE; diff -- > git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c index > f13fc3b353..7e171039eb 100644 > --- a/drivers/net/mlx5/mlx5_rxq.c > +++ b/drivers/net/mlx5/mlx5_rxq.c > @@ -655,6 +655,14 @@ mlx5_rx_queue_pre_setup(struct rte_eth_dev > *dev, uint16_t idx, uint16_t *desc, > struct mlx5_rxq_priv *rxq; > bool empty; >=20 > + if (*desc > 1 << priv->sh->cdev->config.hca_attr.log_max_wq_sz) { > + DRV_LOG(ERR, > + "port %u number of descriptors requested for Rx > queue" > + " %u is more than supported", > + dev->data->port_id, idx); > + rte_errno =3D EINVAL; > + return -EINVAL; > + } > if (!rte_is_power_of_2(*desc)) { > *desc =3D 1 << log2above(*desc); > DRV_LOG(WARNING, > diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c > index f05534e168..3e93517323 100644 > --- a/drivers/net/mlx5/mlx5_txq.c > +++ b/drivers/net/mlx5/mlx5_txq.c > @@ -333,6 +333,14 @@ mlx5_tx_queue_pre_setup(struct rte_eth_dev > *dev, uint16_t idx, uint16_t *desc) { > struct mlx5_priv *priv =3D dev->data->dev_private; >=20 > + if (*desc > 1 << priv->sh->cdev->config.hca_attr.log_max_wq_sz) { > + DRV_LOG(ERR, > + "port %u number of descriptors requested for Tx > queue" > + " %u is more than supported", > + dev->data->port_id, idx); > + rte_errno =3D EINVAL; > + return -EINVAL; > + } > if (*desc <=3D MLX5_TX_COMP_THRESH) { > DRV_LOG(WARNING, > "port %u number of descriptors requested for Tx > queue" > -- > 2.45.2