This patch implements checking if Multiport E-Switch is enabled
on a given PCI device, using sysfs Linux kernel interface.
This facility will be used in follow up commits,
which add support for such configuration to mlx5 PMD.
MLNX_OFED mlx5_core kernel module versions which support
Multiport E-Switch do not expose this configuration through Devlink,
but through sysfs interface.
If such a version is used, then Multiport E-Switch can be enabled
(or its state can be probed) through a sysfs file under path:
# <ifname> should be substituted with Linux interface name.
/sys/class/net/<ifname>/compat/devlink/lag_port_select_mode
Writing "multiport_esw" to this file enables Multiport E-Switch.
If "multiport_esw" is read from this file, then
Multiport E-Switch is enabled.
If this file does not exist or writing "multiport_esw" to this file,
raises an error, then Multiport E-Switch is not supported.
Signed-off-by: Dariusz Sosnowski <dsosnow...@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viachesl...@nvidia.com>
---
drivers/net/mlx5/linux/mlx5_os.c | 69 ++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index 2f08f2354e..7a656a7237 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -1931,6 +1931,75 @@ mlx5_device_bond_pci_match(const char *ibdev_name,
return pf;
}
+#define SYSFS_MPESW_PARAM_MAX_LEN 16
+
+static __rte_unused int
+mlx5_sysfs_esw_multiport_get(struct ibv_device *ibv, struct rte_pci_addr
*pci_addr, int *enabled)
+{
+ int nl_rdma;
+ unsigned int n_ports;
+ unsigned int i;
+ int ret;
+
+ /* Provide correct value to have defined enabled state in case of an
error. */
+ *enabled = 0;
+ nl_rdma = mlx5_nl_init(NETLINK_RDMA, 0);
+ if (nl_rdma < 0)
+ return nl_rdma;
+ n_ports = mlx5_nl_portnum(nl_rdma, ibv->name);
+ if (!n_ports) {
+ ret = -rte_errno;
+ goto close_nl_rdma;
+ }
+ for (i = 1; i <= n_ports; ++i) {
+ unsigned int ifindex;
+ char ifname[IF_NAMESIZE + 1];
+ struct rte_pci_addr if_pci_addr;
+ char mpesw[SYSFS_MPESW_PARAM_MAX_LEN + 1];
+ FILE *sysfs;
+ int n;
+
+ ifindex = mlx5_nl_ifindex(nl_rdma, ibv->name, i);
+ if (!ifindex)
+ continue;
+ if (!if_indextoname(ifindex, ifname))
+ continue;
+ MKSTR(sysfs_if_path, "/sys/class/net/%s", ifname);
+ if (mlx5_get_pci_addr(sysfs_if_path, &if_pci_addr))
+ continue;
+ if (pci_addr->domain != if_pci_addr.domain ||
+ pci_addr->bus != if_pci_addr.bus ||
+ pci_addr->devid != if_pci_addr.devid ||
+ pci_addr->function != if_pci_addr.function)
+ continue;
+ MKSTR(sysfs_mpesw_path,
+ "/sys/class/net/%s/compat/devlink/lag_port_select_mode",
ifname);
+ sysfs = fopen(sysfs_mpesw_path, "r");
+ if (!sysfs)
+ continue;
+ n = fscanf(sysfs, "%" RTE_STR(SYSFS_MPESW_PARAM_MAX_LEN) "s",
mpesw);
+ fclose(sysfs);
+ if (n != 1)
+ continue;
+ ret = 0;
+ if (strcmp(mpesw, "multiport_esw") == 0) {
+ *enabled = 1;
+ break;
+ }
+ *enabled = 0;
+ break;
+ }
+ if (i > n_ports) {
+ DRV_LOG(DEBUG, "Unable to get Multiport E-Switch state by
sysfs.");
+ rte_errno = ENOENT;
+ ret = -rte_errno;
+ }
+
+close_nl_rdma:
+ close(nl_rdma);
+ return ret;
+}
+
/**
* Register a PCI device within bonding.
*
--
2.25.1
