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Message-ID: <2d891be2-7c5a-55ae-9cb8-71922444acb1@mellanox.com>
Date: Thu, 24 Jan 2019 07:31:33 +0000
From: Eran Ben Elisha <eranbe@...lanox.com>
To: Jiri Pirko <jiri@...nulli.us>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Jiri Pirko <jiri@...lanox.com>,
"David S. Miller" <davem@...emloft.net>,
Saeed Mahameed <saeedm@...lanox.com>,
Moshe Shemesh <moshe@...lanox.com>,
Wei Yongjun <weiyongjun1@...wei.com>
Subject: Re: [PATCH net-next 1/7] devlink: Add devlink msg API
On 1/23/2019 4:31 PM, Jiri Pirko wrote:
> Tue, Jan 22, 2019 at 04:57:18PM CET, eranbe@...lanox.com wrote:
>> Devlink msg is a mechanism to pass descriptors between drivers and
>> devlink, in json-like format. The API allows the driver to add objects,
>> object pair, value array (nested attributes), value and name.
>>
>> Driver can use this API to fill the msg context in a format which can be
>> translated by the devlink to the netlink message later.
>>
>> With this API, driver does not need to declare the total size per message
>> context, and it dynamically add more messages to the context (bounded by
>> the system memory limitation only).
>> There is an implicit request to have the preliminary main objects size
>> created via this API to be upper bounded by netlink SKB size, as those
>> objects do not get fragmented between different SKBs when passed to the
>> netlink layer.
>>
>> Devlink msg will replace devlink buffers for health reporters. Devlink
>> buffers which will be deprecated and removed in the downstream patch.
>>
>> Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
>> CC: Wei Yongjun <weiyongjun1@...wei.com>
>> Reviewed-by: Moshe Shemesh <moshe@...lanox.com>
>> ---
>> include/net/devlink.h | 70 ++++++
>> include/uapi/linux/devlink.h | 8 +
>> net/core/devlink.c | 455 +++++++++++++++++++++++++++++++++++
>> 3 files changed, 533 insertions(+)
>>
>> diff --git a/include/net/devlink.h b/include/net/devlink.h
>> index a81a1b7a67d7..fe323e9b14e1 100644
>> --- a/include/net/devlink.h
>> +++ b/include/net/devlink.h
>> @@ -424,6 +424,7 @@ struct devlink_region;
>>
>> typedef void devlink_snapshot_data_dest_t(const void *data);
>>
>> +struct devlink_msg_ctx;
>> struct devlink_health_buffer;
>> struct devlink_health_reporter;
>>
>> @@ -615,6 +616,21 @@ int devlink_region_snapshot_create(struct devlink_region *region, u64 data_len,
>> u8 *data, u32 snapshot_id,
>> devlink_snapshot_data_dest_t *data_destructor);
>>
>> +int devlink_msg_nest_start(struct devlink_msg_ctx *msg_ctx, int attrtype);
>
>
> devlink_msg_*() functions should work with struct devlink_msg.
> devlink_msg_ctx*() functions should work with struct devlink_msg_ctx.
> Please be consistent with the naming.
>
> I think you can call this just "struct devlink_msg" of maybe "fmsg" as
> for "formatted message" - so it is not confused with any other devlink
> netlink message.
Ack.
>
>
>
>> +int devlink_msg_nest_end(struct devlink_msg_ctx *msg_ctx);
>> +int devlink_msg_put_value(struct devlink_msg_ctx *msg_ctx,
>> + void *value, u16 value_len, u8 value_nla_type);
>> +int devlink_msg_put_name(struct devlink_msg_ctx *msg_ctx,
>> + char *name);
>> +int devlink_msg_put_name_value_pair(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void *value, u16 value_len,
>> + u8 value_nla_type);
>> +int devlink_msg_put_name_value_array(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void **value, u16 *value_len,
>> + u8 *value_nla_type, int array_size);
>> +int devlink_msg_object_start(struct devlink_msg_ctx *msg_ctx, char *name);
>> +int devlink_msg_object_end(struct devlink_msg_ctx *msg_ctx, char *name);
>> +
>> int devlink_health_buffer_nest_start(struct devlink_health_buffer *buffer,
>> int attrtype);
>> void devlink_health_buffer_nest_end(struct devlink_health_buffer *buffer);
>> @@ -903,6 +919,60 @@ devlink_region_snapshot_create(struct devlink_region *region, u64 data_len,
>> return 0;
>> }
>>
>> +static inline int
>> +devlink_msg_nest_start(struct devlink_msg_ctx *msg_ctx, int attrtype)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_nest_end(struct devlink_msg_ctx *msg_ctx)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_put_value(struct devlink_msg_ctx *msg_ctx,
>> + void *value, u16 value_len, u8 value_nla_type)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_put_name(struct devlink_msg_ctx *msg_ctx,
>> + char *name)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_put_name_value_pair(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void *value, u16 value_len,
>> + u8 value_nla_type)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_put_name_value_array(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void **value, u16 *value_len,
>> + u8 *value_nla_type, int array_size)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_object_start(struct devlink_msg_ctx *msg_ctx, char *name)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int
>> +devlink_msg_object_end(struct devlink_msg_ctx *msg_ctx, char *name)
>> +{
>> + return 0;
>> +}
>> +
>> static inline int
>> devlink_health_buffer_nest_start(struct devlink_health_buffer *buffer,
>> int attrtype)
>> diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
>> index 6b26bb2ce4dc..68eeda1d0455 100644
>> --- a/include/uapi/linux/devlink.h
>> +++ b/include/uapi/linux/devlink.h
>> @@ -300,6 +300,14 @@ enum devlink_attr {
>> DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_TYPE, /* u8 */
>> DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_DATA, /* dynamic */
>>
>> + DEVLINK_ATTR_MSG_OBJECT, /* nested */
>> + DEVLINK_ATTR_MSG_OBJECT_PAIR, /* nested */
>> + DEVLINK_ATTR_MSG_OBJECT_NAME, /* string */
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE, /* nested */
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_ARRAY, /* nested */
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE, /* u8 */
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA, /* dynamic */
>> +
>> DEVLINK_ATTR_HEALTH_REPORTER, /* nested */
>> DEVLINK_ATTR_HEALTH_REPORTER_NAME, /* string */
>> DEVLINK_ATTR_HEALTH_REPORTER_STATE, /* u8 */
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index 60248a53c0ad..57ca096849b3 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -4098,6 +4098,461 @@ devlink_health_buffer_snd(struct genl_info *info,
>> return err;
>> }
>>
>> +struct devlink_msg {
>
> Let's call this "struct devlink_msg_item"
Ack.
>
>
>> + struct list_head list;
>> + int attrtype;
>> + u8 nla_type;
>> + u16 len;
>> + int value[0];
>> +};
>> +
>> +struct devlink_msg_ctx {
>> + struct list_head msg_list;
>> + int max_nested_depth;
>> + int curr_nest;
>> +};
>> +
>> +#define DEVLINK_MSG_MAX_SIZE (4096 - GENL_HDRLEN)
>> +
>> +static struct devlink_msg_ctx *devlink_msg_ctx_alloc(void)
>> +{
>> + struct devlink_msg_ctx *msg_ctx;
>> +
>> + msg_ctx = kzalloc(sizeof(*msg_ctx), GFP_KERNEL);
>> + if (!msg_ctx)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + INIT_LIST_HEAD(&msg_ctx->msg_list);
>> +
>> + return msg_ctx;
>> +}
>> +
>> +static void devlink_msg_ctx_free(struct devlink_msg_ctx *msg_ctx)
>> +{
>> + struct devlink_msg *msg, *tm;
>> +
>> + list_for_each_entry_safe(msg, tm, &msg_ctx->msg_list, list) {
>> + list_del(&msg->list);
>> + kfree(msg);
>> + }
>> + kfree(msg_ctx);
>> +}
>> +
>> +int devlink_msg_nest_start(struct devlink_msg_ctx *msg_ctx, int attrtype)
>> +{
>> + struct devlink_msg *nest_msg;
>> +
>> + if (attrtype != DEVLINK_ATTR_MSG_OBJECT &&
>> + attrtype != DEVLINK_ATTR_MSG_OBJECT_PAIR &&
>> + attrtype != DEVLINK_ATTR_MSG_OBJECT_VALUE &&
>> + attrtype != DEVLINK_ATTR_MSG_OBJECT_VALUE_ARRAY)
>> + return -EINVAL;
>> +
>> + nest_msg = kzalloc(sizeof(*nest_msg), GFP_KERNEL);
>> + if (!nest_msg)
>> + return -ENOMEM;
>> +
>> + nest_msg->attrtype = attrtype;
>> + msg_ctx->curr_nest++;
>> + msg_ctx->max_nested_depth = max(msg_ctx->max_nested_depth,
>> + msg_ctx->curr_nest);
>> + list_add_tail(&nest_msg->list, &msg_ctx->msg_list);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_nest_start);
>> +
>> +int devlink_msg_nest_end(struct devlink_msg_ctx *msg_ctx)
>> +{
>> + struct devlink_msg *nest_msg;
>> +
>> + WARN_ON(!msg_ctx->curr_nest);
>> + nest_msg = kzalloc(sizeof(*nest_msg), GFP_KERNEL);
>> + if (!nest_msg)
>> + return -ENOMEM;
>> +
>> + msg_ctx->curr_nest--;
>> + list_add_tail(&nest_msg->list, &msg_ctx->msg_list);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_nest_end);
>> +
>> +int devlink_msg_put_value(struct devlink_msg_ctx *msg_ctx,
>> + void *value, u16 value_len, u8 value_nla_type)
>> +{
>> + struct devlink_msg *value_msg;
>> +
>> + if (value_len > DEVLINK_MSG_MAX_SIZE)
>> + return -EMSGSIZE;
>> +
>> + if (value_nla_type != NLA_U8 &&
>> + value_nla_type != NLA_U32 &&
>> + value_nla_type != NLA_U64 &&
>> + value_nla_type != NLA_NUL_STRING &&
>> + value_nla_type != NLA_BINARY)
>> + return -EINVAL;
>> +
>> + value_msg = kzalloc(sizeof(*value_msg) + value_len, GFP_KERNEL);
>
> Looks fine.
>
>
>> + if (!value_msg)
>> + return -ENOMEM;
>> +
>> + value_msg->nla_type = value_nla_type;
>> + value_msg->len = value_len;
>> + value_msg->attrtype = DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA;
>> + memcpy(&value_msg->value, value, value_len);
>> + list_add_tail(&value_msg->list, &msg_ctx->msg_list);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_put_value);
>> +
>> +int devlink_msg_put_name(struct devlink_msg_ctx *msg_ctx, char *name)
>> +{
>> + struct devlink_msg *name_msg;
>> +
>> + if (strlen(name) + 1 > DEVLINK_MSG_MAX_SIZE)
>> + return -EMSGSIZE;
>> +
>> + name_msg = kzalloc(sizeof(*name_msg) + strlen(name) + 1, GFP_KERNEL);
>> + if (!name_msg)
>> + return -ENOMEM;
>> +
>> + name_msg->nla_type = NLA_NUL_STRING;
>> + name_msg->len = strlen(name) + 1;
>> + name_msg->attrtype = DEVLINK_ATTR_MSG_OBJECT_NAME;
>> + memcpy(&name_msg->value, name, name_msg->len);
>> + list_add_tail(&name_msg->list, &msg_ctx->msg_list);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_put_name);
>> +
>> +int devlink_msg_put_name_value_pair(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void *value, u16 value_len,
>> + u8 value_nla_type)
>> +{
>> + int err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_PAIR);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_put_name(msg_ctx, name);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_VALUE);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_put_value(msg_ctx, value, value_len, value_nla_type);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_put_name_value_pair);
>> +
>> +int devlink_msg_put_name_value_array(struct devlink_msg_ctx *msg_ctx,
>> + char *name, void **value, u16 *value_len,
>> + u8 *value_nla_type, int array_size)
>
> This is limitting the arrays to plain values. One should be able to nest
> objects inside. If fact, that is what you can to do with sqs:
>
> object start
> name sqs
> array start
> object start
> index 0
> xxx yyy
> object end
> object start
> index 1
> xxx yyy
> object end
> array end
> object end
>
> So you need to have:
> devlink_msg_put_array_start()
> devlink_msg_put_array_end()
Sounds good, will do.
>
>
>> +{
>> + int err, i;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_PAIR);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_put_name(msg_ctx, name);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_VALUE);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx,
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_ARRAY);
>> + if (err)
>> + return err;
>> +
>> + for (i = 0; i < array_size; i++) {
>> + err = devlink_msg_nest_start(msg_ctx,
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_put_value(msg_ctx, value[i],
>> + value_len[i], value_nla_type[i]);
>> + if (err)
>> + return err;
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> + }
>> +
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_end(msg_ctx);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_put_name_value_array);
>> +
>> +int devlink_msg_object_start(struct devlink_msg_ctx *msg_ctx, char *name)
>> +{
>> + int err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT);
>> + if (err)
>> + return err;
>> +
>> + if (!name)
>> + return 0;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_PAIR);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_put_name(msg_ctx, name);
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_start(msg_ctx, DEVLINK_ATTR_MSG_OBJECT_VALUE);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_object_start);
>> +
>> +int devlink_msg_object_end(struct devlink_msg_ctx *msg_ctx, char *name)
>> +{
>> + int err;
>> +
>> + if (!name)
>> + goto end_object;
>> +
>> + err = devlink_msg_nest_end(msg_ctx); /* DEVLINK_ATTR_MSG_OBJECT_VALUE */
>> + if (err)
>> + return err;
>> +
>> + err = devlink_msg_nest_end(msg_ctx); /* DEVLINK_ATTR_MSG_OBJECT_PAIR */
>> + if (err)
>> + return err;
>> +
>> +end_object:
>> + err = devlink_msg_nest_end(msg_ctx); /* DEVLINK_ATTR_MSG_OBJECT */
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_msg_object_end);
>> +
>> +static int
>> +devlink_msg_fill_data(struct sk_buff *skb, struct devlink_msg *msg)
>> +{
>> + int err;
>> +
>> + switch (msg->nla_type) {
>> + case NLA_U8:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA,
>> + *(u8 *)msg->value);
>> + break;
>> + case NLA_U32:
>> + err = nla_put_u32(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA,
>> + *(u32 *)msg->value);
>> + break;
>> + case NLA_U64:
>> + err = nla_put_u64_64bit(skb,
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA,
>> + *(u64 *)msg->value, DEVLINK_ATTR_PAD);
>> + break;
>> + case NLA_NUL_STRING:
>> + err = nla_put_string(skb,
>> + DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA,
>> + (char *)&msg->value);
>> + break;
>> + case NLA_BINARY:
>> + err = nla_put(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA,
>> + msg->len, (void *)&msg->value);
>> + break;
>> + default:
>> + err = -EINVAL;
>> + break;
>> + }
>> +
>> + return err;
>> +}
>> +
>> +static int
>> +devlink_msg_fill_type(struct sk_buff *skb, struct devlink_msg *msg)
>> +{
>> + int err;
>> +
>> + switch (msg->nla_type) {
>> + case NLA_U8:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE,
>> + NLA_U8);
>> + break;
>> + case NLA_U32:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE,
>> + NLA_U32);
>> + break;
>> + case NLA_U64:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE,
>> + NLA_U64);
>> + break;
>> + case NLA_NUL_STRING:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE,
>> + NLA_NUL_STRING);
>> + break;
>> + case NLA_BINARY:
>> + err = nla_put_u8(skb, DEVLINK_ATTR_MSG_OBJECT_VALUE_TYPE,
>> + NLA_BINARY);
>> + break;
>> + default:
>> + err = -EINVAL;
>> + break;
>> + }
>> +
>> + return err;
>> +}
>> +
>> +static int
>> +devlink_msg_prepare_skb(struct sk_buff *skb, struct devlink_msg_ctx *msg_ctx,
>> + int *start)
>> +{
>> + struct nlattr **nlattr_arr;
>> + struct devlink_msg *msg;
>> + int j = 0, i = 0;
>> + int err;
>> +
>> + nlattr_arr = kcalloc(msg_ctx->max_nested_depth,
>> + sizeof(*nlattr_arr), GFP_KERNEL);
>> + if (!nlattr_arr)
>> + return -EINVAL;
>> +
>> + list_for_each_entry(msg, &msg_ctx->msg_list, list) {
>> + if (j < *start) {
>> + j++;
>> + continue;
>> + }
>> +
>> + switch (msg->attrtype) {
>> + case DEVLINK_ATTR_MSG_OBJECT:
>> + case DEVLINK_ATTR_MSG_OBJECT_PAIR:
>> + case DEVLINK_ATTR_MSG_OBJECT_VALUE:
>> + case DEVLINK_ATTR_MSG_OBJECT_VALUE_ARRAY:
>> + nlattr_arr[i] = nla_nest_start(skb, msg->attrtype);
>> + if (!nlattr_arr[i]) {
>> + err = -EMSGSIZE;
>> + goto nla_put_failure;
>> + }
>> + i++;
>> + break;
>> + case DEVLINK_ATTR_MSG_OBJECT_VALUE_DATA:
>> + err = devlink_msg_fill_data(skb, msg);
>> + if (err)
>> + goto nla_put_failure;
>> + err = devlink_msg_fill_type(skb, msg);
>> + if (err)
>> + goto nla_put_failure;
>> + break;
>> + case DEVLINK_ATTR_MSG_OBJECT_NAME:
>> + err = nla_put_string(skb, msg->attrtype,
>> + (char *)&msg->value);
>> + if (err)
>> + goto nla_put_failure;
>> + break;
>> + default: /* No attrtype */
>> + nla_nest_end(skb, nlattr_arr[--i]);
>> + break;
>> + }
>> + j++;
>> + if (!i)
>> + *start = j;
>> + }
>> +
>> + kfree(nlattr_arr);
>> + return 0;
>> +
>> +nla_put_failure:
>> + for (j = 0; j < i; j++)
>> + nla_nest_cancel(skb, nlattr_arr[j]);
>> + kfree(nlattr_arr);
>> + return err;
>> +}
>> +
>> +static int devlink_msg_snd(struct genl_info *info,
>> + enum devlink_command cmd, int flags,
>> + struct devlink_msg_ctx *msg_ctx)
>> +{
>> + struct sk_buff *skb;
>> + struct nlmsghdr *nlh;
>> + int err, index = 0;
>> + bool last = false;
>> + void *hdr;
>> +
>> + while (!last) {
>> + int tmp_index = index;
>> +
>> + skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
>> + if (!skb)
>> + return -ENOMEM;
>> +
>> + hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
>> + &devlink_nl_family, NLM_F_MULTI, cmd);
>> + if (!hdr)
>> + goto nla_put_failure;
>> +
>> + err = devlink_msg_prepare_skb(skb, msg_ctx, &index);
>> + if (!err)
>> + last = true;
>> + else if (err != -EMSGSIZE || tmp_index == index)
>> + goto nla_put_failure;
>> +
>> + genlmsg_end(skb, hdr);
>> + err = genlmsg_reply(skb, info);
>> + if (err)
>> + return err;
>
>
> Looks fine.
>
>
>> + }
>> +
>> + skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
>> + if (!skb)
>> + return -ENOMEM;
>> + nlh = nlmsg_put(skb, info->snd_portid, info->snd_seq,
>> + NLMSG_DONE, 0, flags | NLM_F_MULTI);
>> + err = genlmsg_reply(skb, info);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +
>> +nla_put_failure:
>> + err = -EIO;
>> + nlmsg_free(skb);
>> + return err;
>> +}
>> +
>> struct devlink_health_reporter {
>> struct list_head list;
>> struct devlink_health_buffer **dump_buffers_array;
>> --
>> 2.17.1
>>
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