[dpdk-dev] [PATCH v2 04/14] common/mlx5: get PCI device address from any bus

[Xueming Li <xuemingl@nvidia.com>]

From: Thomas Monjalon <thomas@monjalon.net>

A function is exported to allow retrieving the PCI address
of the parent PCI device of a Sub-Function in auxiliary bus sysfs.
The function mlx5_dev_to_pci_str() is accepting both PCI and auxiliary
devices. In case of a PCI device, it is simply using the device name.

The function mlx5_dev_to_pci_addr(), which is based on sysfs path
and do not use any device object, is renamed to mlx5_get_pci_addr()
for clarity purpose.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 .../common/mlx5/linux/mlx5_common_auxiliary.c | 19 +++++++++++++++
 drivers/common/mlx5/linux/mlx5_common_os.c    |  5 ++--
 drivers/common/mlx5/mlx5_common.c             | 23 +++++++++++++++++++
 drivers/common/mlx5/mlx5_common.h             | 16 ++++++++++++-
 drivers/common/mlx5/mlx5_common_private.h     |  2 ++
 drivers/common/mlx5/version.map               |  3 ++-
 drivers/net/mlx5/linux/mlx5_os.c              |  6 ++---
 7 files changed, 66 insertions(+), 8 deletions(-)

diff --git a/drivers/common/mlx5/linux/mlx5_common_auxiliary.c b/drivers/common/mlx5/linux/mlx5_common_auxiliary.c
index 4ca27cd281..6584aeb18e 100644
--- a/drivers/common/mlx5/linux/mlx5_common_auxiliary.c
+++ b/drivers/common/mlx5/linux/mlx5_common_auxiliary.c
@@ -4,6 +4,8 @@
 
 #include <stdlib.h>
 #include <dirent.h>
+#include <libgen.h>
+
 #include <rte_malloc.h>
 #include <rte_errno.h>
 #include <rte_bus_auxiliary.h>
@@ -66,6 +68,23 @@ mlx5_auxiliary_get_pci_path(const struct rte_auxiliary_device *dev,
 	return 0;
 }
 
+int
+mlx5_auxiliary_get_pci_str(const struct rte_auxiliary_device *dev,
+			   char *addr, size_t size)
+{
+	char sysfs_pci[PATH_MAX];
+	char *base;
+
+	if (mlx5_auxiliary_get_pci_path(dev, sysfs_pci, sizeof(sysfs_pci)) != 0)
+		return -ENODEV;
+	base = basename(sysfs_pci);
+	if (base == NULL)
+		return -errno;
+	if (rte_strscpy(addr, base, size) < 0)
+		return -rte_errno;
+	return 0;
+}
+
 static int
 mlx5_auxiliary_get_numa(const struct rte_auxiliary_device *dev)
 {
diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c b/drivers/common/mlx5/linux/mlx5_common_os.c
index 337e9df8cb..9e0c823c97 100644
--- a/drivers/common/mlx5/linux/mlx5_common_os.c
+++ b/drivers/common/mlx5/linux/mlx5_common_os.c
@@ -24,8 +24,7 @@ const struct mlx5_glue *mlx5_glue;
 #endif
 
 int
-mlx5_dev_to_pci_addr(const char *dev_path,
-		     struct rte_pci_addr *pci_addr)
+mlx5_get_pci_addr(const char *dev_path, struct rte_pci_addr *pci_addr)
 {
 	FILE *file;
 	char line[32];
@@ -417,7 +416,7 @@ mlx5_os_get_ibv_device(const struct rte_pci_addr *addr)
 		struct rte_pci_addr paddr;
 
 		DRV_LOG(DEBUG, "Checking device \"%s\"..", ibv_list[n]->name);
-		if (mlx5_dev_to_pci_addr(ibv_list[n]->ibdev_path, &paddr) != 0)
+		if (mlx5_get_pci_addr(ibv_list[n]->ibdev_path, &paddr) != 0)
 			continue;
 		if (rte_pci_addr_cmp(addr, &paddr) != 0)
 			continue;
diff --git a/drivers/common/mlx5/mlx5_common.c b/drivers/common/mlx5/mlx5_common.c
index 6544e664ce..c258cd127a 100644
--- a/drivers/common/mlx5/mlx5_common.c
+++ b/drivers/common/mlx5/mlx5_common.c
@@ -196,6 +196,29 @@ to_mlx5_device(const struct rte_device *rte_dev)
 	return NULL;
 }
 
+int
+mlx5_dev_to_pci_str(const struct rte_device *dev, char *addr, size_t size)
+{
+	struct rte_pci_addr pci_addr = { 0 };
+	int ret;
+
+	if (mlx5_dev_is_pci(dev)) {
+		/* Input might be <BDF>, format PCI address to <DBDF>. */
+		ret = rte_pci_addr_parse(dev->name, &pci_addr);
+		if (ret != 0)
+			return -ENODEV;
+		rte_pci_device_name(&pci_addr, addr, size);
+		return 0;
+	}
+#ifdef RTE_EXEC_ENV_LINUX
+	return mlx5_auxiliary_get_pci_str(RTE_DEV_TO_AUXILIARY_CONST(dev),
+			addr, size);
+#else
+	rte_errno = ENODEV;
+	return -rte_errno;
+#endif
+}
+
 static void
 dev_release(struct mlx5_common_device *dev)
 {
diff --git a/drivers/common/mlx5/mlx5_common.h b/drivers/common/mlx5/mlx5_common.h
index 5a027903b3..26d1b58853 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -210,6 +210,20 @@ check_cqe(volatile struct mlx5_cqe *cqe, const uint16_t cqes_n,
 	return MLX5_CQE_STATUS_SW_OWN;
 }
 
+/*
+ * Get PCI address <DBDF> string from EAL device.
+ *
+ * @param[out] addr
+ *	The output address buffer string
+ * @param[in] size
+ *	The output buffer size
+ * @return
+ *   - 0 on success.
+ *   - Negative value and rte_errno is set otherwise.
+ */
+__rte_internal
+int mlx5_dev_to_pci_str(const struct rte_device *dev, char *addr, size_t size);
+
 /*
  * Get PCI address from sysfs of a PCI-related device.
  *
@@ -224,7 +238,7 @@ check_cqe(volatile struct mlx5_cqe *cqe, const uint16_t cqes_n,
  *   - Negative value and rte_errno is set otherwise.
  */
 __rte_internal
-int mlx5_dev_to_pci_addr(const char *dev_path, struct rte_pci_addr *pci_addr);
+int mlx5_get_pci_addr(const char *dev_path, struct rte_pci_addr *pci_addr);
 
 /*
  * Get kernel network interface name from sysfs IB device path.
diff --git a/drivers/common/mlx5/mlx5_common_private.h b/drivers/common/mlx5/mlx5_common_private.h
index 9f00a6c54d..1096fa85e7 100644
--- a/drivers/common/mlx5/mlx5_common_private.h
+++ b/drivers/common/mlx5/mlx5_common_private.h
@@ -39,6 +39,8 @@ bool mlx5_dev_pci_match(const struct mlx5_class_driver *drv,
 void mlx5_common_auxiliary_init(void);
 struct ibv_device *mlx5_get_aux_ibv_device(
 		const struct rte_auxiliary_device *dev);
+int mlx5_auxiliary_get_pci_str(const struct rte_auxiliary_device *dev,
+			       char *addr, size_t size);
 
 #ifdef __cplusplus
 }
diff --git a/drivers/common/mlx5/version.map b/drivers/common/mlx5/version.map
index b47d73b425..a47c86e354 100644
--- a/drivers/common/mlx5/version.map
+++ b/drivers/common/mlx5/version.map
@@ -15,7 +15,7 @@ INTERNAL {
 	mlx5_create_mr_ext;
 
 	mlx5_dev_is_pci; # WINDOWS_NO_EXPORT
-	mlx5_dev_to_pci_addr; # WINDOWS_NO_EXPORT
+	mlx5_dev_to_pci_str; # WINDOWS_NO_EXPORT
 
 	mlx5_devx_alloc_uar; # WINDOWS_NO_EXPORT
 
@@ -75,6 +75,7 @@ INTERNAL {
 	mlx5_free;
 
 	mlx5_get_ifname_sysfs; # WINDOWS_NO_EXPORT
+	mlx5_get_pci_addr; # WINDOWS_NO_EXPORT
 
 	mlx5_glue;
 
diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index ec2f8a4aed..5c568794d7 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -1918,7 +1918,7 @@ mlx5_device_bond_pci_match(const struct ibv_device *ibv_dev,
 		/* Process slave interface names in the loop. */
 		snprintf(tmp_str, sizeof(tmp_str),
 			 "/sys/class/net/%s", ifname);
-		if (mlx5_dev_to_pci_addr(tmp_str, &pci_addr)) {
+		if (mlx5_get_pci_addr(tmp_str, &pci_addr)) {
 			DRV_LOG(WARNING, "can not get PCI address"
 					 " for netdev \"%s\"", ifname);
 			continue;
@@ -2095,8 +2095,8 @@ mlx5_os_pci_probe_pf(struct rte_pci_device *pci_dev,
 			break;
 		} else {
 			/* Bonding device not found. */
-			if (mlx5_dev_to_pci_addr
-				(ibv_list[ret]->ibdev_path, &pci_addr))
+			if (mlx5_get_pci_addr(ibv_list[ret]->ibdev_path,
+					      &pci_addr))
 				continue;
 			if (owner_pci.domain != pci_addr.domain ||
 			    owner_pci.bus != pci_addr.bus ||
-- 
2.25.1