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Message-Id: <1530703837-24563-3-git-send-email-moshe@mellanox.com>
Date: Wed, 4 Jul 2018 14:30:29 +0300
From: Moshe Shemesh <moshe@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Moshe Shemesh <moshe@...lanox.com>
Subject: [PATCH net-next 02/10] devlink: Add param get command
Add param get command which gets data per parameter.
Option to dump the parameters data per device.
Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
include/uapi/linux/devlink.h | 11 ++
net/core/devlink.c | 250 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 261 insertions(+)
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index d814fa6..2ccfe84 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -78,6 +78,8 @@ enum devlink_command {
*/
DEVLINK_CMD_RELOAD,
+ DEVLINK_CMD_PARAM_GET, /* can dump */
+
/* add new commands above here */
__DEVLINK_CMD_MAX,
DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -248,6 +250,15 @@ enum devlink_attr {
DEVLINK_ATTR_PORT_NUMBER, /* u32 */
DEVLINK_ATTR_PORT_SPLIT_SUBPORT_NUMBER, /* u32 */
+ DEVLINK_ATTR_PARAM, /* nested */
+ DEVLINK_ATTR_PARAM_NAME, /* string */
+ DEVLINK_ATTR_PARAM_GENERIC, /* flag */
+ DEVLINK_ATTR_PARAM_TYPE, /* u8 */
+ DEVLINK_ATTR_PARAM_VALUES_LIST, /* nested */
+ DEVLINK_ATTR_PARAM_VALUE, /* nested */
+ DEVLINK_ATTR_PARAM_VALUE_DATA, /* dynamic */
+ DEVLINK_ATTR_PARAM_VALUE_CMODE, /* u8 */
+
/* add new attributes above here, update the policy in devlink.c */
__DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 41b1a5d..b22d412 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -2645,6 +2645,248 @@ static int devlink_param_driver_verify(const struct devlink_param *param)
return NULL;
}
+static bool
+devlink_param_cmode_is_supported(const struct devlink_param *param,
+ enum devlink_param_cmode cmode)
+{
+ return test_bit(cmode, ¶m->supported_cmodes);
+}
+
+static int devlink_param_get(struct devlink *devlink,
+ const struct devlink_param *param,
+ struct devlink_param_gset_ctx *ctx)
+{
+ if (!param->get)
+ return -EOPNOTSUPP;
+ return param->get(devlink, param->id, ctx);
+}
+
+static int
+devlink_param_type_to_nla_type(enum devlink_param_type param_type)
+{
+ switch (param_type) {
+ case DEVLINK_PARAM_TYPE_U8:
+ return NLA_U8;
+ case DEVLINK_PARAM_TYPE_U16:
+ return NLA_U16;
+ case DEVLINK_PARAM_TYPE_U32:
+ return NLA_U32;
+ case DEVLINK_PARAM_TYPE_STRING:
+ return NLA_STRING;
+ case DEVLINK_PARAM_TYPE_BOOL:
+ return NLA_FLAG;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int
+devlink_nl_param_value_fill_one(struct sk_buff *msg,
+ enum devlink_param_type type,
+ enum devlink_param_cmode cmode,
+ union devlink_param_value val)
+{
+ struct nlattr *param_value_attr;
+
+ param_value_attr = nla_nest_start(msg, DEVLINK_ATTR_PARAM_VALUE);
+ if (!param_value_attr)
+ goto nla_put_failure;
+
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_VALUE_CMODE, cmode))
+ goto value_nest_cancel;
+
+ switch (type) {
+ case DEVLINK_PARAM_TYPE_U8:
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu8))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_U16:
+ if (nla_put_u16(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu16))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_U32:
+ if (nla_put_u32(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu32))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_STRING:
+ if (nla_put_string(msg, DEVLINK_ATTR_PARAM_VALUE_DATA,
+ val.vstr))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_BOOL:
+ if (val.vbool &&
+ nla_put_flag(msg, DEVLINK_ATTR_PARAM_VALUE_DATA))
+ goto value_nest_cancel;
+ break;
+ }
+
+ nla_nest_end(msg, param_value_attr);
+ return 0;
+
+value_nest_cancel:
+ nla_nest_cancel(msg, param_value_attr);
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
+ struct devlink_param_item *param_item,
+ enum devlink_command cmd,
+ u32 portid, u32 seq, int flags)
+{
+ union devlink_param_value param_value[DEVLINK_PARAM_CMODE_MAX + 1];
+ const struct devlink_param *param = param_item->param;
+ struct devlink_param_gset_ctx ctx;
+ struct nlattr *param_values_list;
+ struct nlattr *param_attr;
+ int nla_type;
+ void *hdr;
+ int err;
+ int i;
+
+ /* Get value from driver part to driverinit configuration mode */
+ for (i = 0; i <= DEVLINK_PARAM_CMODE_MAX; i++) {
+ if (!devlink_param_cmode_is_supported(param, i))
+ continue;
+ if (i == DEVLINK_PARAM_CMODE_DRIVERINIT) {
+ if (!param_item->driverinit_value_valid)
+ return -EOPNOTSUPP;
+ param_value[i] = param_item->driverinit_value;
+ } else {
+ ctx.cmode = i;
+ err = devlink_param_get(devlink, param, &ctx);
+ if (err)
+ return err;
+ param_value[i] = ctx.val;
+ }
+ }
+
+ hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (devlink_nl_put_handle(msg, devlink))
+ goto genlmsg_cancel;
+ param_attr = nla_nest_start(msg, DEVLINK_ATTR_PARAM);
+ if (!param_attr)
+ goto genlmsg_cancel;
+ if (nla_put_string(msg, DEVLINK_ATTR_PARAM_NAME, param->name))
+ goto param_nest_cancel;
+ if (param->generic && nla_put_flag(msg, DEVLINK_ATTR_PARAM_GENERIC))
+ goto param_nest_cancel;
+
+ nla_type = devlink_param_type_to_nla_type(param->type);
+ if (nla_type < 0)
+ goto param_nest_cancel;
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_TYPE, nla_type))
+ goto param_nest_cancel;
+
+ param_values_list = nla_nest_start(msg, DEVLINK_ATTR_PARAM_VALUES_LIST);
+ if (!param_values_list)
+ goto param_nest_cancel;
+
+ for (i = 0; i <= DEVLINK_PARAM_CMODE_MAX; i++) {
+ if (!devlink_param_cmode_is_supported(param, i))
+ continue;
+ err = devlink_nl_param_value_fill_one(msg, param->type,
+ i, param_value[i]);
+ if (err)
+ goto values_list_nest_cancel;
+ }
+
+ nla_nest_end(msg, param_values_list);
+ nla_nest_end(msg, param_attr);
+ genlmsg_end(msg, hdr);
+ return 0;
+
+values_list_nest_cancel:
+ nla_nest_end(msg, param_values_list);
+param_nest_cancel:
+ nla_nest_cancel(msg, param_attr);
+genlmsg_cancel:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
+ struct netlink_callback *cb)
+{
+ struct devlink_param_item *param_item;
+ 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(param_item, &devlink->param_list, list) {
+ if (idx < start) {
+ idx++;
+ continue;
+ }
+ err = devlink_nl_param_fill(msg, devlink, param_item,
+ DEVLINK_CMD_PARAM_GET,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI);
+ 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 struct devlink_param_item *
+devlink_param_get_from_info(struct devlink *devlink,
+ struct genl_info *info)
+{
+ char *param_name;
+
+ if (!info->attrs[DEVLINK_ATTR_PARAM_NAME])
+ return NULL;
+
+ param_name = nla_data(info->attrs[DEVLINK_ATTR_PARAM_NAME]);
+ return devlink_param_find_by_name(&devlink->param_list, param_name);
+}
+
+static int devlink_nl_cmd_param_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct devlink *devlink = info->user_ptr[0];
+ struct devlink_param_item *param_item;
+ struct sk_buff *msg;
+ int err;
+
+ param_item = devlink_param_get_from_info(devlink, info);
+ if (!param_item)
+ return -EINVAL;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ err = devlink_nl_param_fill(msg, devlink, param_item,
+ DEVLINK_CMD_PARAM_GET,
+ info->snd_portid, info->snd_seq, 0);
+ if (err) {
+ nlmsg_free(msg);
+ return err;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
static int devlink_param_register_one(struct devlink *devlink,
const struct devlink_param *param)
{
@@ -2883,6 +3125,14 @@ static void devlink_param_unregister_one(struct devlink *devlink,
.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
DEVLINK_NL_FLAG_NO_LOCK,
},
+ {
+ .cmd = DEVLINK_CMD_PARAM_GET,
+ .doit = devlink_nl_cmd_param_get_doit,
+ .dumpit = devlink_nl_cmd_param_get_dumpit,
+ .policy = devlink_nl_policy,
+ .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
+ /* can be retrieved by unprivileged users */
+ },
};
static struct genl_family devlink_nl_family __ro_after_init = {
--
1.8.3.1
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