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devlink: Add support for region get command 

Add support for DEVLINK_CMD_REGION_GET command which is used for
querying for the supported DEV/REGION values of devlink devices.
The support is both for doit and dumpit.

Reply includes:
  BUS_NAME, DEVICE_NAME, REGION_NAME, REGION_SIZE

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Vesker 2018-07-12 15:13:11 +03:00 committed by David S. Miller
parent d7e5272282
commit d8db7ea55f
2 changed files with 120 additions and 0 deletions
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6
include/uapi/linux/devlink.h
View File

@ -83,6 +83,9 @@ enum devlink_command {
DEVLINK_CMD_PARAM_NEW,
DEVLINK_CMD_PARAM_DEL,
DEVLINK_CMD_REGION_GET,
DEVLINK_CMD_REGION_SET,
/* add new commands above here */
__DEVLINK_CMD_MAX,
DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@ -262,6 +265,9 @@ enum devlink_attr {
DEVLINK_ATTR_PARAM_VALUE_DATA, /* dynamic */
DEVLINK_ATTR_PARAM_VALUE_CMODE, /* u8 */
DEVLINK_ATTR_REGION_NAME, /* string */
DEVLINK_ATTR_REGION_SIZE, /* u64 */
/* add new attributes above here, update the policy in devlink.c */
__DEVLINK_ATTR_MAX,

114
net/core/devlink.c
View File

@ -3149,6 +3149,111 @@ static void devlink_param_unregister_one(struct devlink *devlink,
kfree(param_item);
}
static int devlink_nl_region_fill(struct sk_buff *msg, struct devlink *devlink,
enum devlink_command cmd, u32 portid,
u32 seq, int flags,
struct devlink_region *region)
{
void *hdr;
int err;
hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
if (!hdr)
return -EMSGSIZE;
err = devlink_nl_put_handle(msg, devlink);
if (err)
goto nla_put_failure;
err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, region->name);
if (err)
goto nla_put_failure;
err = nla_put_u64_64bit(msg, DEVLINK_ATTR_REGION_SIZE,
region->size,
DEVLINK_ATTR_PAD);
if (err)
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return err;
}
static int devlink_nl_cmd_region_get_doit(struct sk_buff *skb,
struct genl_info *info)
{
struct devlink *devlink = info->user_ptr[0];
struct devlink_region *region;
const char *region_name;
struct sk_buff *msg;
int err;
if (!info->attrs[DEVLINK_ATTR_REGION_NAME])
return -EINVAL;
region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
region = devlink_region_get_by_name(devlink, region_name);
if (!region)
return -EINVAL;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
err = devlink_nl_region_fill(msg, devlink, DEVLINK_CMD_REGION_GET,
info->snd_portid, info->snd_seq, 0,
region);
if (err) {
nlmsg_free(msg);
return err;
}
return genlmsg_reply(msg, info);
}
static int devlink_nl_cmd_region_get_dumpit(struct sk_buff *msg,
struct netlink_callback *cb)
{
struct devlink_region *region;
struct devlink *devlink;
int start = cb->args[0];
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
continue;
mutex_lock(&devlink->lock);
list_for_each_entry(region, &devlink->region_list, list) {
if (idx < start) {
idx++;
continue;
}
err = devlink_nl_region_fill(msg, devlink,
DEVLINK_CMD_REGION_GET,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI, region);
if (err) {
mutex_unlock(&devlink->lock);
goto out;
}
idx++;
}
mutex_unlock(&devlink->lock);
}
out:
mutex_unlock(&devlink_mutex);
cb->args[0] = idx;
return msg->len;
}
static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING },
[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING },
@ -3172,6 +3277,7 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
[DEVLINK_ATTR_PARAM_NAME] = { .type = NLA_NUL_STRING },
[DEVLINK_ATTR_PARAM_TYPE] = { .type = NLA_U8 },
[DEVLINK_ATTR_PARAM_VALUE_CMODE] = { .type = NLA_U8 },
[DEVLINK_ATTR_REGION_NAME] = { .type = NLA_NUL_STRING },
};
static const struct genl_ops devlink_nl_ops[] = {
@ -3370,6 +3476,14 @@ static const struct genl_ops devlink_nl_ops[] = {
.flags = GENL_ADMIN_PERM,
.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
},
{
.cmd = DEVLINK_CMD_REGION_GET,
.doit = devlink_nl_cmd_region_get_doit,
.dumpit = devlink_nl_cmd_region_get_dumpit,
.policy = devlink_nl_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
},
};
static struct genl_family devlink_nl_family __ro_after_init = {