From: Michael Baum <michae...@nvidia.com>
Add function for creating additional CTX for same device base on
existing CTX.
Signed-off-by: Michael Baum <michae...@nvidia.com>
---
drivers/common/mlx5/linux/mlx5_common_os.c | 52 ++++++++++++++++++++
drivers/common/mlx5/mlx5_common.h | 4 ++
drivers/common/mlx5/version.map | 1 +
drivers/common/mlx5/windows/mlx5_common_os.c | 31 ++++++++++++
4 files changed, 88 insertions(+)
diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c
b/drivers/common/mlx5/linux/mlx5_common_os.c
index 41345e1597..2f5032f0da 100644
--- a/drivers/common/mlx5/linux/mlx5_common_os.c
+++ b/drivers/common/mlx5/linux/mlx5_common_os.c
@@ -873,6 +873,58 @@ mlx5_os_open_device(struct mlx5_common_device *cdev,
uint32_t classes)
return 0;
}
+/**
+ * API function to obtain a new InfiniBand (IB) context for a given common
device.
+ *
+ * This function provides a port-agnostic IB context for a physical device,
enabling the
+ * device to create and manage resources that can be initialized when a port
starts and
+ * released when another port stops.
+ *
+ * For Linux, it imports new context from the existing context.
+ *
+ * @param cdev
+ * Pointer to the mlx5 device structure.
+ *
+ * @return
+ * Pointer to an `ibv_context` on success, or NULL on failure, with
`rte_errno` set.
+ */
+void *
+mlx5_os_get_physical_device_ctx(struct mlx5_common_device *cdev)
+{
+ struct ibv_context *ctx = NULL;
+ int cmd_fd = ((struct ibv_context *)cdev->ctx)->cmd_fd;
+ int new_cmd_fd;
+
+ /*
+ * Duplicate the command FD to pass it as input to the import device
function.
+ * If the import function succeeds, the new device context takes
ownership of
+ * this FD, which will be freed when the new device is closed.
+ * If the import function fails, we are responsible for closing this FD.
+ */
+ new_cmd_fd = dup(cmd_fd);
+ if (new_cmd_fd < 0) {
+ DRV_LOG(ERR,
+ "Failed to duplicate FD %d for IB device \"%s\": %s",
+ cmd_fd, mlx5_os_get_ctx_device_name(cdev->ctx),
+ rte_strerror(errno));
+ rte_errno = errno;
+ return NULL;
+ }
+ /* Attempt to import the duplicated FD to create a new device context.
*/
+ ctx = mlx5_glue->import_device(new_cmd_fd);
+ if (!ctx) {
+ DRV_LOG(ERR, "Failed to import IB device \"%s\": %s",
+ mlx5_os_get_ctx_device_name(cdev->ctx),
+ rte_strerror(errno));
+ close(new_cmd_fd);
+ rte_errno = errno;
+ return NULL;
+ }
+ DRV_LOG(INFO, "IB device \"%s\" successfully imported, old_fd=%d,
new_fd=%d",
+ mlx5_os_get_ctx_device_name(cdev->ctx), cmd_fd, new_cmd_fd);
+ return (void *)ctx;
+}
+
int
mlx5_get_device_guid(const struct rte_pci_addr *dev, uint8_t *guid, size_t len)
{
diff --git a/drivers/common/mlx5/mlx5_common.h
b/drivers/common/mlx5/mlx5_common.h
index e7bd4c6ec4..bea1382911 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -651,6 +651,10 @@ mlx5_devx_uar_release(struct mlx5_uar *uar);
/* mlx5_common_os.c */
+__rte_internal
+void *
+mlx5_os_get_physical_device_ctx(struct mlx5_common_device *cdev);
+
int mlx5_os_open_device(struct mlx5_common_device *cdev, uint32_t classes);
int mlx5_os_pd_prepare(struct mlx5_common_device *cdev);
int mlx5_os_pd_release(struct mlx5_common_device *cdev);
diff --git a/drivers/common/mlx5/version.map b/drivers/common/mlx5/version.map
index 8301485839..819e6b96cb 100644
--- a/drivers/common/mlx5/version.map
+++ b/drivers/common/mlx5/version.map
@@ -150,6 +150,7 @@ INTERNAL {
mlx5_nl_rdma_monitor_info_get; # WINDOWS_NO_EXPORT
mlx5_nl_rdma_monitor_cap_get; # WINDOWS_NO_EXPORT
+ mlx5_os_get_physical_device_ctx;
mlx5_os_umem_dereg;
mlx5_os_umem_reg;
diff --git a/drivers/common/mlx5/windows/mlx5_common_os.c
b/drivers/common/mlx5/windows/mlx5_common_os.c
index 2b6058eb3e..68f1981193 100644
--- a/drivers/common/mlx5/windows/mlx5_common_os.c
+++ b/drivers/common/mlx5/windows/mlx5_common_os.c
@@ -266,6 +266,37 @@ mlx5_os_open_device(struct mlx5_common_device *cdev,
uint32_t classes)
return -rte_errno;
}
+/**
+ * API function to obtain a new MLX5 context for a given common device.
+ *
+ * This function provides a port-agnostic context for a physical device,
enabling the
+ * device to create and manage resources that can be initialized when a port
starts and
+ * released when another port stops.
+ *
+ * For Windows, it creates a new context for the device regardless to existing
context.
+ *
+ * @param cdev
+ * Pointer to the mlx5 device structure.
+ *
+ * @return
+ * Pointer to an `ibv_context` on success, or NULL on failure, with
`rte_errno` set.
+ */
+void *
+mlx5_os_get_physical_device_ctx(struct mlx5_common_device *cdev)
+{
+ struct mlx5_common_device temp = {
+ .dev = cdev->dev,
+ };
+
+ if (mlx5_os_open_device(&temp, MLX5_CLASS_ETH) < 0) {
+ DRV_LOG(ERR, "Failed to duplicate DevX device \"%s\": %s",
+ mlx5_os_get_ctx_device_name(cdev->ctx),
+ rte_strerror(rte_errno));
+ return NULL;
+ }
+ return (void *)temp.ctx;
+}
+
/**
* Register umem.
*
--
2.45.2
