[dpdk-dev] [PATCH v4 3/3] net/mlx5: add a parameter for Netlink support in VF

[Nelio Laranjeiro <nelio.laranjeiro@6wind.com>]

All Netlink request the PMD will do can also be done by a iproute2 command
line interface, enabling VF behavior configuration without having to modify
the application nor reaching PMD limits (e.g. MAC address number limit).

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 doc/guides/nics/mlx5.rst | 9 +++++++++
 drivers/net/mlx5/mlx5.c  | 9 ++++++++-
 drivers/net/mlx5/mlx5.h  | 1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index c812f0b4f..b1bab2ce2 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -344,6 +344,15 @@ Run-time configuration
 
   Enabled by default.
 
+- ``vf_nl_en`` parameter [int]
+
+  A nonzero value enables Netlink requests from the VF to add/remove MAC
+  addresses or/and enable/disable promiscuous/all multicast on the Netdevice.
+  Otherwise the relevant configuration must be run with Linux iproute2 tools.
+  This is a prerequisite to receive this kind of traffic.
+
+  Enabled by default, valid only on VF devices ignored otherwise.
+
 Prerequisites
 -------------
 
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index e52c60fb3..cfab55897 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -69,6 +69,9 @@
 /* Device parameter to enable hardware Rx vector. */
 #define MLX5_RX_VEC_EN "rx_vec_en"
 
+/* Activate Netlink support in VF mode. */
+#define MLX5_VF_NL_EN "vf_nl_en"
+
 #ifndef HAVE_IBV_MLX5_MOD_MPW
 #define MLX5DV_CONTEXT_FLAGS_MPW_ALLOWED (1 << 2)
 #define MLX5DV_CONTEXT_FLAGS_ENHANCED_MPW (1 << 3)
@@ -412,6 +415,8 @@ mlx5_args_check(const char *key, const char *val, void *opaque)
 		config->tx_vec_en = !!tmp;
 	} else if (strcmp(MLX5_RX_VEC_EN, key) == 0) {
 		config->rx_vec_en = !!tmp;
+	} else if (strcmp(MLX5_VF_NL_EN, key) == 0) {
+		config->vf_nl_en = !!tmp;
 	} else {
 		DRV_LOG(WARNING, "%s: unknown parameter", key);
 		rte_errno = EINVAL;
@@ -443,6 +448,7 @@ mlx5_args(struct mlx5_dev_config *config, struct rte_devargs *devargs)
 		MLX5_TXQ_MAX_INLINE_LEN,
 		MLX5_TX_VEC_EN,
 		MLX5_RX_VEC_EN,
+		MLX5_VF_NL_EN,
 		NULL,
 	};
 	struct rte_kvargs *kvlist;
@@ -747,6 +753,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 			.txq_inline = MLX5_ARG_UNSET,
 			.txqs_inline = MLX5_ARG_UNSET,
 			.inline_max_packet_sz = MLX5_ARG_UNSET,
+			.vf_nl_en = 1,
 		};
 
 		len = snprintf(name, sizeof(name), PCI_PRI_FMT,
@@ -963,7 +970,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 		claim_zero(mlx5_mac_addr_add(eth_dev, &mac, 0, 0));
 		priv->nl_socket = -1;
 		priv->nl_sn = 0;
-		if (vf) {
+		if (vf && config.vf_nl_en) {
 			priv->nl_socket = mlx5_nl_init(RTMGRP_LINK);
 			if (priv->nl_socket < 0)
 				priv->nl_socket = -1;
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 50cc09946..63b24e6bb 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -88,6 +88,7 @@ struct mlx5_dev_config {
 	unsigned int tx_vec_en:1; /* Tx vector is enabled. */
 	unsigned int rx_vec_en:1; /* Rx vector is enabled. */
 	unsigned int mpw_hdr_dseg:1; /* Enable DSEGs in the title WQEBB. */
+	unsigned int vf_nl_en:1; /* Enable Netlink requests in VF mode. */
 	unsigned int tso_max_payload_sz; /* Maximum TCP payload for TSO. */
 	unsigned int ind_table_max_size; /* Maximum indirection table size. */
 	int txq_inline; /* Maximum packet size for inlining. */
-- 
2.17.0