[v4,1/2] common/mlx5: support pcie device guid query
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Commit Message
sysfs entry "phys_switch_id" holds each PCIe device'
guid.
The devices which reside in the same physical NIC should
have the same guid.
Signed-off-by: Rongwei Liu <rongweil@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
drivers/common/mlx5/linux/mlx5_common_os.c | 41 ++++++++++++++++++++++
drivers/common/mlx5/linux/mlx5_common_os.h | 19 ++++++++++
2 files changed, 60 insertions(+)
@@ -2,6 +2,7 @@
* Copyright 2020 Mellanox Technologies, Ltd
*/
+#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
@@ -428,3 +429,43 @@ mlx5_os_get_ibv_device(const struct rte_pci_addr *addr)
mlx5_glue->free_device_list(ibv_list);
return ibv_match;
}
+
+int
+mlx5_get_device_guid(const struct rte_pci_addr *dev, uint8_t *guid, size_t len)
+{
+ char tmp[512];
+ char cur_ifname[IF_NAMESIZE + 1];
+ FILE *id_file;
+ DIR *dir;
+ struct dirent *ptr;
+ int ret;
+
+ if (guid == NULL || len < sizeof(u_int64_t) + 1)
+ return -1;
+ memset(guid, 0, len);
+ snprintf(tmp, sizeof(tmp), "/sys/bus/pci/devices/%04x:%02x:%02x.%x/net",
+ dev->domain, dev->bus, dev->devid, dev->function);
+ dir = opendir(tmp);
+ if (dir == NULL)
+ return -1;
+ /* Traverse to identify PF interface */
+ do {
+ ptr = readdir(dir);
+ if (ptr == NULL || ptr->d_type != DT_DIR) {
+ closedir(dir);
+ return -1;
+ }
+ } while (strchr(ptr->d_name, '.') || strchr(ptr->d_name, '_') ||
+ strchr(ptr->d_name, 'v'));
+ snprintf(cur_ifname, sizeof(cur_ifname), "%s", ptr->d_name);
+ closedir(dir);
+ snprintf(tmp + strlen(tmp), sizeof(tmp) - strlen(tmp),
+ "/%s/phys_switch_id", cur_ifname);
+ /* Older OFED like 5.3 doesn't support read */
+ id_file = fopen(tmp, "r");
+ if (!id_file)
+ return 0;
+ ret = fscanf(id_file, "%16s", guid);
+ fclose(id_file);
+ return ret;
+}
@@ -296,4 +296,23 @@ __rte_internal
struct ibv_device *
mlx5_os_get_ibv_dev(const struct rte_device *dev);
+/**
+ * This is used to query system_image_guid as describing in PRM.
+ *
+ * @param dev[in]
+ * Pointer to a device instance as PCIe id.
+ * @param guid[out]
+ * Pointer to the buffer to hold device guid.
+ * Guid is uint64_t and corresponding to 17 bytes string.
+ * @param len[in]
+ * Guid buffer length, 17 bytes at least.
+ *
+ * @return
+ * -1 if internal failure.
+ * 0 if OFED doesn't support.
+ * >0 if success.
+ */
+int
+mlx5_get_device_guid(const struct rte_pci_addr *dev, uint8_t *guid, size_t len);
+
#endif /* RTE_PMD_MLX5_COMMON_OS_H_ */