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Date: Wed, 23 Jan 2019 15:31:20 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Eran Ben Elisha <eranbe@...lanox.com>
Cc: 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
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.
>+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"
>+ 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()
>+{
>+ 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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