[dpdk-dev] [RFC 01/10] net/mlx5: add multiport IB device port structure

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

The Mellanox NICs support SR-IOV and have E-Switch feature.
When SR-IOV is set up in switchdev mode and E-Switch is enabled
we have so called VF representors in the system. All representors
belonging to the same E-Switch are created on the basis of the
single PCI function and with current implementation each representor
has its own dedicated Infiniband device and operates within its
own Infiniband context. It is proposed to provide representors
as ports of the single Infiniband device and operate on the
shared Infiniband context saving various resources. This patch
introduces appropriate structures.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 5384453..3487eed 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -186,10 +186,36 @@ struct mlx5_drop {
 
 struct mlx5_flow_tcf_context;
 
+/* Per port data of shared IB device. */
+struct mlx5_ibv_shared_port {
+	uint32_t port_id;
+};
+
+/*
+ * Shared Infiniband device context for Master/Representors
+ * which belong to same IB device with multiple IB ports.
+ **/
+struct mlx5_ibv_shared {
+	LIST_ENTRY(mlx5_ibv_shared) next;
+	uint32_t refcnt;
+	uint32_t devx:1; /* Opened with DV. */
+	uint32_t secondary:1; /* Temporary spawned by secondary process. */
+	uint32_t max_port; /* Maximal IB device port index. */
+	struct ibv_context *ctx; /* Verbs/DV context. */
+	struct ibv_pd *pd; /* Protection Domain. */
+	char ibdev_name[IBV_SYSFS_NAME_MAX]; /* IB device name. */
+	char ibdev_path[IBV_SYSFS_PATH_MAX]; /* IB device path for secondary */
+	struct ibv_device_attr_ex device_attr; /* Device properties. */
+	struct rte_intr_handle intr_handle; /* Interrupt handler for device. */
+	struct mlx5_ibv_shared_port port[]; /* per device port data array. */
+};
+
 struct mlx5_priv {
 	LIST_ENTRY(mlx5_priv) mem_event_cb;
 	/**< Called by memory event callback. */
 	struct rte_eth_dev_data *dev_data;  /* Pointer to device data. */
+	struct mlx5_ibv_shared *sh; /* Shared IB device context. */
+	uint32_t ibv_port; /* IB device port number. */
 	struct ibv_context *ctx; /* Verbs context. */
 	struct ibv_device_attr_ex device_attr; /* Device properties. */
 	struct ibv_pd *pd; /* Protection Domain. */
-- 
1.8.3.1