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From: Srikanth Kaka <srikanth.k@oneconvergence.com>
To: Matan Azrad <matan@nvidia.com>,
Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Cc: dev@dpdk.org, Vag Singh <vag.singh@oneconvergence.com>,
Anand Thulasiram <avelu@juniper.net>,
Srikanth Kaka <srikanth.k@oneconvergence.com>
Date: Fri, 8 Oct 2021 00:13:16 +0530
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Subject: [dpdk-dev] [PATCH v2 07/41] common/mlx5: retrieve the device index
and name
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The mlx5_core kernel driver creates a sysctl variable
dev.mlx5_core.0.ifname: mce0
Using this the device index and interface name are obtained
The interface name can be used by PMD to communicate with
FreeBSD network stack
Signed-off-by: Srikanth Kaka <srikanth.k@oneconvergence.com>
Signed-off-by: Vag Singh <vag.singh@oneconvergence.com>
Signed-off-by: Anand Thulasiram <avelu@juniper.net>
---
drivers/common/mlx5/freebsd/mlx5_common_os.c | 44 ++++++++++++++++++++
drivers/common/mlx5/freebsd/mlx5_common_os.h | 6 +++
2 files changed, 50 insertions(+)
diff --git a/drivers/common/mlx5/freebsd/mlx5_common_os.c b/drivers/common/mlx5/freebsd/mlx5_common_os.c
index 9c3cd1e4e6..23370857eb 100644
--- a/drivers/common/mlx5/freebsd/mlx5_common_os.c
+++ b/drivers/common/mlx5/freebsd/mlx5_common_os.c
@@ -4,14 +4,58 @@
#include <unistd.h>
#include <stdio.h>
+#include <net/if.h>
#include <sys/sysctl.h>
#include <rte_errno.h>
#include "mlx5_common.h"
#include "mlx5_common_log.h"
+#include "mlx5_common_os.h"
#include "mlx5_glue.h"
+/**
+ * Derive IB dev index from devpath
+ */
+int
+mlx5_get_ibvindex(const char *ibdev_path)
+{
+ unsigned int ibv_idx;
+
+ MLX5_ASSERT(ibdev_path);
+ if (sscanf(ibdev_path, "/sys/class/infiniband/mlx5_%u",
+ &ibv_idx) != 1)
+ ibv_idx = -1;
+
+ return ibv_idx;
+}
+
+int
+mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname)
+{
+ char buffer[MLX5_SYSCTL_BY_NAME_SIZE];
+ char name[IF_NAMESIZE];
+ size_t len = IF_NAMESIZE;
+ unsigned int idx;
+
+ idx = mlx5_get_ibvindex(ibdev_path);
+ if (idx < 0) {
+ rte_errno = EINVAL;
+ return -rte_errno;
+ }
+
+ snprintf(buffer, sizeof(buffer), "dev.mlx5_core.%u.ifname", idx);
+ if (sysctlbyname(buffer, &name, &len, NULL, 0)) {
+ DRV_LOG(ERR, "port %u failed to get interface name: %s",
+ idx, strerror(errno));
+ rte_errno = errno;
+ return -rte_errno;
+ }
+ strncpy(ifname, name, IF_NAMESIZE);
+
+ return 0;
+}
+
/**
* Initialization routine for run-time dependency on rdma-core.
*/
diff --git a/drivers/common/mlx5/freebsd/mlx5_common_os.h b/drivers/common/mlx5/freebsd/mlx5_common_os.h
index dab67ecbf0..60e7c4f21f 100644
--- a/drivers/common/mlx5/freebsd/mlx5_common_os.h
+++ b/drivers/common/mlx5/freebsd/mlx5_common_os.h
@@ -18,6 +18,8 @@
#include "mlx5_autoconf.h"
#include "mlx5_glue.h"
+#define MLX5_SYSCTL_BY_NAME_SIZE 100
+
/**
* Get device name. Given an ibv_device pointer - return a
* pointer to the corresponding device name.
@@ -287,4 +289,8 @@ mlx5_os_free(void *addr)
{
free(addr);
}
+
+int
+mlx5_get_ibvindex(const char *ibdev_path);
+
#endif /* RTE_PMD_MLX5_COMMON_OS_H_ */
--
2.30.2