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net/mlx4: check RSS queues number limitation

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This patch verifies that the number of Rx queues configured for RSS
is supported by the device hardware.
RSS support in mlx4 requires contiguous chunk of QPs to be reserved,
there is a hardware limitation on the amount of contiguous QPs which
is reported by the hardware. Ignoring this value will cause Rx queues
creation to fail.

Cc: stable@dpdk.org

Signed-off-by: Moti Haimovsky <motih@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
This commit is contained in:
Moti Haimovsky 2018-07-25 17:47:39 +03:00 committed by Shahaf Shuler
parent e94be227b7
commit 2b4e423fd4
3 changed files with 10 additions and 0 deletions
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3
drivers/net/mlx4/mlx4.c
View File

@ -673,6 +673,9 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
&device_attr_ex);
DEBUG("supported RSS hash fields mask: %016" PRIx64,
priv->hw_rss_sup);
priv->hw_rss_max_qps =
device_attr_ex.rss_caps.max_rwq_indirection_table_size;
DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
IBV_RAW_PACKET_CAP_SCATTER_FCS);
DEBUG("FCS stripping toggling is %ssupported",

1
drivers/net/mlx4/mlx4.h
View File

@ -95,6 +95,7 @@ struct priv {
uint32_t hw_fcs_strip:1; /**< FCS stripping toggling is supported. */
uint32_t tso:1; /**< Transmit segmentation offload is supported. */
uint32_t tso_max_payload_sz; /**< Max supported TSO payload size. */
uint32_t hw_rss_max_qps; /**< Max Rx Queues supported by RSS. */
uint64_t hw_rss_sup; /**< Supported RSS hash fields (Verbs format). */
struct rte_intr_handle intr_handle; /**< Port interrupt handle. */
struct mlx4_drop *drop; /**< Shared resources for drop flow rules. */

6
drivers/net/mlx4/mlx4_rxq.c
View File

@ -338,6 +338,12 @@ mlx4_rss_init(struct priv *priv)
if (priv->rss_init)
return 0;
if (priv->dev->data->nb_rx_queues > priv->hw_rss_max_qps) {
ERROR("RSS does not support more than %d queues",
priv->hw_rss_max_qps);
rte_errno = EINVAL;
return -rte_errno;
}
/* Prepare range for RSS contexts before creating the first WQ. */
ret = mlx4_glue->dv_set_context_attr
(priv->ctx,