Add a new attribute that indicates the port's number of lanes to devlink port.

Expose the attribute to user space as RO value, for example:

$devlink port show swp1
pci/0000:03:00.0/61: type eth netdev swp1 flavour physical port 1 lanes 1

Signed-off-by: Danielle Ratson <daniel...@mellanox.com>
Reviewed-by: Jiri Pirko <j...@mellanox.com>
---
 devlink/devlink.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 535c98d1..4aeb9f34 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -3398,6 +3398,10 @@ static void pr_out_port(struct dl *dl, struct nlattr 
**tb)
        if (tb[DEVLINK_ATTR_PORT_SPLIT_GROUP])
                print_uint(PRINT_ANY, "split_group", " split_group %u",
                           mnl_attr_get_u32(tb[DEVLINK_ATTR_PORT_SPLIT_GROUP]));
+       if (tb[DEVLINK_ATTR_PORT_LANES])
+               print_uint(PRINT_ANY, "lanes", " lanes %u",
+                          mnl_attr_get_u32(tb[DEVLINK_ATTR_PORT_LANES]));
+
        pr_out_port_function(dl, tb);
        pr_out_port_handle_end(dl);
 }
-- 
2.20.1

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