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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. Signed-off-by: Moti Haimovsky --- drivers/net/mlx4/mlx4.c | 3 +++ drivers/net/mlx4/mlx4.h | 1 + drivers/net/mlx4/mlx4_rxq.c | 6 ++++++ 3 files changed, 10 insertions(+) diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c index c67d2c0..defc0d4 100644 --- a/drivers/net/mlx4/mlx4.c +++ b/drivers/net/mlx4/mlx4.c @@ -673,6 +673,9 @@ struct mlx4_conf { &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", diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h index 89d8c38..e6fb934 100644 --- a/drivers/net/mlx4/mlx4.h +++ b/drivers/net/mlx4/mlx4.h @@ -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. */ diff --git a/drivers/net/mlx4/mlx4_rxq.c b/drivers/net/mlx4/mlx4_rxq.c index 0cd9560..e8bef1d 100644 --- a/drivers/net/mlx4/mlx4_rxq.c +++ b/drivers/net/mlx4/mlx4_rxq.c @@ -338,6 +338,12 @@ struct mlx4_rss * 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, -- 1.8.3.1