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devlink: Support querying hardware address of port function 

Add support to query the hardware address of function represented
by devlink port function.

Example of a PCI VF port which supports a port function:
$ devlink port show pci/0000:06:00.0/2
pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
  function:
    hw_addr 00:11:22:33:44:66

$ devlink port show pci/0000:06:00.0/2 -jp
{
    "port": {
        "pci/0000:06:00.0/2": {
            "type": "eth",
            "netdev": "enp6s0pf0vf1",
            "flavour": "pcivf",
            "pfnum": 0,
            "vfnum": 1,
            "function": {
                "hw_addr": "00:11:22:33:44:66"
            }
        }
    }
}

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Parav Pandit 2020-06-23 10:44:24 +00:00 committed by David Ahern
parent 2de449df19
commit b3adafd154
1 changed files with 57 additions and 0 deletions
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57
devlink/devlink.c
View File

@ -26,6 +26,7 @@
#include <libmnl/libmnl.h>
#include <netinet/ether.h>
#include <sys/types.h>
#include <rt_names.h>
#include "SNAPSHOT.h"
#include "list.h"
@ -708,6 +709,30 @@ static int attr_stats_cb(const struct nlattr *attr, void *data)
return MNL_CB_OK;
}
static const enum mnl_attr_data_type
devlink_function_policy[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {
[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR ] = MNL_TYPE_BINARY,
};
static int function_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type;
/* Allow the tool to work on top of newer kernels that might contain
* more attributes.
*/
if (mnl_attr_type_valid(attr, DEVLINK_PORT_FUNCTION_ATTR_MAX) < 0)
return MNL_CB_OK;
type = mnl_attr_get_type(attr);
if (mnl_attr_validate(attr, devlink_function_policy[type]) < 0)
return MNL_CB_ERROR;
tb[type] = attr;
return MNL_CB_OK;
}
static int ifname_map_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
@ -3243,6 +3268,37 @@ static void pr_out_port_pfvf_num(struct dl *dl, struct nlattr **tb)
}
}
static void pr_out_port_function(struct dl *dl, struct nlattr **tb_port)
{
struct nlattr *tb[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {};
unsigned char *data;
SPRINT_BUF(hw_addr);
uint32_t len;
int err;
if (!tb_port[DEVLINK_ATTR_PORT_FUNCTION])
return;
err = mnl_attr_parse_nested(tb_port[DEVLINK_ATTR_PORT_FUNCTION],
function_attr_cb, tb);
if (err != MNL_CB_OK)
return;
if (!tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR])
return;
len = mnl_attr_get_payload_len(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
data = mnl_attr_get_payload(tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR]);
pr_out_object_start(dl, "function");
check_indent_newline(dl);
print_string(PRINT_ANY, "hw_addr", "hw_addr %s",
ll_addr_n2a(data, len, 0, hw_addr, sizeof(hw_addr)));
if (!dl->json_output)
__pr_out_indent_dec();
pr_out_object_end(dl);
}
static void pr_out_port(struct dl *dl, struct nlattr **tb)
{
struct nlattr *pt_attr = tb[DEVLINK_ATTR_PORT_TYPE];
@ -3296,6 +3352,7 @@ 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]));
pr_out_port_function(dl, tb);
pr_out_port_handle_end(dl);
}