[PATCH net-next V4 07/14] devlink: Allow parent dev for rate-set and rate-new

[Tariq Toukan <tariqt@nvidia.com>]

From: Cosmin Ratiu <cratiu@nvidia.com>

Currently, a devlink rate's parent device is assumed to be the same as
the one where the devlink rate is created.

This patch changes that to allow rate commands to accept an additional
argument that specifies the parent dev. This will allow devlink rate
groups with leafs from other devices.

Example of the new usage with ynl:

Creating a group on pci/0000:08:00.1 with a parent to an already
existing pci/0000:08:00.1/group1:
./tools/net/ynl/pyynl/cli.py --spec \
Documentation/netlink/specs/devlink.yaml --do rate-new --json '{
    "bus-name": "pci",
    "dev-name": "0000:08:00.1",
    "rate-node-name": "group2",
    "rate-parent-node-name": "group1",
    "parent-dev": {
        "bus-name": "pci",
        "dev-name": "0000:08:00.1"
    }
  }'

Setting the parent of leaf node pci/0000:08:00.1/65537 to
pci/0000:08:00.0/group1:
./tools/net/ynl/pyynl/cli.py --spec \
Documentation/netlink/specs/devlink.yaml --do rate-set --json '{
    "bus-name": "pci",
    "dev-name": "0000:08:00.1",
    "port-index": 65537,
    "parent-dev": {
        "bus-name": "pci",
        "dev-name": "0000:08:00.0"
    },
    "rate-parent-node-name": "group1"
  }'

Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 Documentation/netlink/specs/devlink.yaml | 10 ++++++----
 net/devlink/netlink_gen.c                | 18 ++++++++++--------
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index 1f41d934dc5b..bfeacfcfdf9e 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml
@@ -2217,8 +2217,8 @@ operations:
       dont-validate: [strict]
       flags: [admin-perm]
       do:
-        pre: devlink-nl-pre-doit
-        post: devlink-nl-post-doit
+        pre: devlink-nl-pre-doit-parent-dev-optional
+        post: devlink-nl-post-doit-parent-dev-optional
         request:
           attributes:
             - bus-name
@@ -2230,6 +2230,7 @@ operations:
             - rate-tx-weight
             - rate-parent-node-name
             - rate-tc-bws
+            - parent-dev
 
     -
       name: rate-new
@@ -2238,8 +2239,8 @@ operations:
       dont-validate: [strict]
       flags: [admin-perm]
       do:
-        pre: devlink-nl-pre-doit
-        post: devlink-nl-post-doit
+        pre: devlink-nl-pre-doit-parent-dev-optional
+        post: devlink-nl-post-doit-parent-dev-optional
         request:
           attributes:
             - bus-name
@@ -2251,6 +2252,7 @@ operations:
             - rate-tx-weight
             - rate-parent-node-name
             - rate-tc-bws
+            - parent-dev
 
     -
       name: rate-del
diff --git a/net/devlink/netlink_gen.c b/net/devlink/netlink_gen.c
index 8fbe0417ab55..91d2c9b69391 100644
--- a/net/devlink/netlink_gen.c
+++ b/net/devlink/netlink_gen.c
@@ -535,7 +535,7 @@ static const struct nla_policy devlink_rate_get_dump_nl_policy[DEVLINK_ATTR_DEV_
 };
 
 /* DEVLINK_CMD_RATE_SET - do */
-static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_RATE_TC_BWS + 1] = {
+static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_PARENT_DEV + 1] = {
 	[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_RATE_NODE_NAME] = { .type = NLA_NUL_STRING, },
@@ -545,10 +545,11 @@ static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_RATE_TC_B
 	[DEVLINK_ATTR_RATE_TX_WEIGHT] = { .type = NLA_U32, },
 	[DEVLINK_ATTR_RATE_PARENT_NODE_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_RATE_TC_BWS] = NLA_POLICY_NESTED(devlink_dl_rate_tc_bws_nl_policy),
+	[DEVLINK_ATTR_PARENT_DEV] = NLA_POLICY_NESTED(devlink_dl_parent_dev_nl_policy),
 };
 
 /* DEVLINK_CMD_RATE_NEW - do */
-static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_RATE_TC_BWS + 1] = {
+static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_PARENT_DEV + 1] = {
 	[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_RATE_NODE_NAME] = { .type = NLA_NUL_STRING, },
@@ -558,6 +559,7 @@ static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_RATE_TC_B
 	[DEVLINK_ATTR_RATE_TX_WEIGHT] = { .type = NLA_U32, },
 	[DEVLINK_ATTR_RATE_PARENT_NODE_NAME] = { .type = NLA_NUL_STRING, },
 	[DEVLINK_ATTR_RATE_TC_BWS] = NLA_POLICY_NESTED(devlink_dl_rate_tc_bws_nl_policy),
+	[DEVLINK_ATTR_PARENT_DEV] = NLA_POLICY_NESTED(devlink_dl_parent_dev_nl_policy),
 };
 
 /* DEVLINK_CMD_RATE_DEL - do */
@@ -1201,21 +1203,21 @@ const struct genl_split_ops devlink_nl_ops[74] = {
 	{
 		.cmd		= DEVLINK_CMD_RATE_SET,
 		.validate	= GENL_DONT_VALIDATE_STRICT,
-		.pre_doit	= devlink_nl_pre_doit,
+		.pre_doit	= devlink_nl_pre_doit_parent_dev_optional,
 		.doit		= devlink_nl_rate_set_doit,
-		.post_doit	= devlink_nl_post_doit,
+		.post_doit	= devlink_nl_post_doit_parent_dev_optional,
 		.policy		= devlink_rate_set_nl_policy,
-		.maxattr	= DEVLINK_ATTR_RATE_TC_BWS,
+		.maxattr	= DEVLINK_ATTR_PARENT_DEV,
 		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
 	{
 		.cmd		= DEVLINK_CMD_RATE_NEW,
 		.validate	= GENL_DONT_VALIDATE_STRICT,
-		.pre_doit	= devlink_nl_pre_doit,
+		.pre_doit	= devlink_nl_pre_doit_parent_dev_optional,
 		.doit		= devlink_nl_rate_new_doit,
-		.post_doit	= devlink_nl_post_doit,
+		.post_doit	= devlink_nl_post_doit_parent_dev_optional,
 		.policy		= devlink_rate_new_nl_policy,
-		.maxattr	= DEVLINK_ATTR_RATE_TC_BWS,
+		.maxattr	= DEVLINK_ATTR_PARENT_DEV,
 		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
 	{
-- 
2.31.1