Date: Fri, 01 Dec 2023 15:28:29 -0800
From: Amritha Nambiar <amritha.nambiar@...el.com>
To: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com
Cc: edumazet@...gle.com, ast@...nel.org, sdf@...gle.com, lorenzo@...nel.org,
 tariqt@...dia.com, daniel@...earbox.net, anthony.l.nguyen@...el.com,
 lucien.xin@...il.com, michael.chan@...adcom.com, hawk@...nel.org,
 sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v11 01/11] netdev-genl: spec: Extend netdev netlink
 spec in YAML for queue

Add support in netlink spec(netdev.yaml) for queue information.
Add code generated from the spec.

Note: The "queue-type" attribute takes values 0 and 1 for rx
and tx queue type respectively.

Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
 Documentation/netlink/specs/netdev.yaml |   52 +++++++++++
 include/uapi/linux/netdev.h             |   16 +++
 net/core/netdev-genl-gen.c              |   26 +++++
 net/core/netdev-genl-gen.h              |    3 +
 net/core/netdev-genl.c                  |   10 ++
 tools/include/uapi/linux/netdev.h       |   16 +++
 tools/net/ynl/generated/netdev-user.c   |  153 +++++++++++++++++++++++++++++++
 tools/net/ynl/generated/netdev-user.h   |   99 ++++++++++++++++++++
 8 files changed, 375 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index eef6358ec587..719e6aafbfdb 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -66,6 +66,10 @@ definitions:
         name: tx-checksum
         doc:
           L3 checksum HW offload is supported by the driver.
+  -
+    name: queue-type
+    type: enum
+    entries: [ rx, tx ]
 
 attribute-sets:
   -
@@ -209,6 +213,31 @@ attribute-sets:
         name: recycle-released-refcnt
         type: uint
 
+  -
+    name: queue
+    attributes:
+      -
+        name: id
+        doc: Queue index; most queue types are indexed like a C array, with
+             indexes starting at 0 and ending at queue count - 1. Queue indexes
+             are scoped to an interface and queue type.
+        type: u32
+      -
+        name: ifindex
+        doc: ifindex of the netdevice to which the queue belongs.
+        type: u32
+        checks:
+          min: 1
+      -
+        name: type
+        doc: Queue type as rx, tx. Each queue type defines a separate ID space.
+        type: u32
+        enum: queue-type
+      -
+        name: napi-id
+        doc: ID of the NAPI instance which services this queue.
+        type: u32
+
 operations:
   list:
     -
@@ -307,6 +336,29 @@ operations:
       dump:
         reply: *pp-stats-reply
       config-cond: page-pool-stats
+    -
+      name: queue-get
+      doc: Get queue information from the kernel.
+           Only configured queues will be reported (as opposed to all available
+           hardware queues).
+      attribute-set: queue
+      do:
+        request:
+          attributes:
+            - ifindex
+            - type
+            - id
+        reply: &queue-get-op
+          attributes:
+            - id
+            - type
+            - napi-id
+            - ifindex
+      dump:
+        request:
+          attributes:
+            - ifindex
+        reply: *queue-get-op
 
 mcast-groups:
   list:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 6244c0164976..f857960a7f06 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -62,6 +62,11 @@ enum netdev_xsk_flags {
 	NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
 };
 
+enum netdev_queue_type {
+	NETDEV_QUEUE_TYPE_RX,
+	NETDEV_QUEUE_TYPE_TX,
+};
+
 enum {
 	NETDEV_A_DEV_IFINDEX = 1,
 	NETDEV_A_DEV_PAD,
@@ -104,6 +109,16 @@ enum {
 	NETDEV_A_PAGE_POOL_STATS_MAX = (__NETDEV_A_PAGE_POOL_STATS_MAX - 1)
 };
 
+enum {
+	NETDEV_A_QUEUE_ID = 1,
+	NETDEV_A_QUEUE_IFINDEX,
+	NETDEV_A_QUEUE_TYPE,
+	NETDEV_A_QUEUE_NAPI_ID,
+
+	__NETDEV_A_QUEUE_MAX,
+	NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1)
+};
+
 enum {
 	NETDEV_CMD_DEV_GET = 1,
 	NETDEV_CMD_DEV_ADD_NTF,
@@ -114,6 +129,7 @@ enum {
 	NETDEV_CMD_PAGE_POOL_DEL_NTF,
 	NETDEV_CMD_PAGE_POOL_CHANGE_NTF,
 	NETDEV_CMD_PAGE_POOL_STATS_GET,
+	NETDEV_CMD_QUEUE_GET,
 
 	__NETDEV_CMD_MAX,
 	NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)
diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c
index dccd8c3a141e..b1dcf88c82cf 100644
--- a/net/core/netdev-genl-gen.c
+++ b/net/core/netdev-genl-gen.c
@@ -46,6 +46,18 @@ static const struct nla_policy netdev_page_pool_stats_get_nl_policy[NETDEV_A_PAG
 };
 #endif /* CONFIG_PAGE_POOL_STATS */
 
+/* NETDEV_CMD_QUEUE_GET - do */
+static const struct nla_policy netdev_queue_get_do_nl_policy[NETDEV_A_QUEUE_TYPE + 1] = {
+	[NETDEV_A_QUEUE_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+	[NETDEV_A_QUEUE_TYPE] = NLA_POLICY_MAX(NLA_U32, 1),
+	[NETDEV_A_QUEUE_ID] = { .type = NLA_U32, },
+};
+
+/* NETDEV_CMD_QUEUE_GET - dump */
+static const struct nla_policy netdev_queue_get_dump_nl_policy[NETDEV_A_QUEUE_IFINDEX + 1] = {
+	[NETDEV_A_QUEUE_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+};
+
 /* Ops table for netdev */
 static const struct genl_split_ops netdev_nl_ops[] = {
 	{
@@ -88,6 +100,20 @@ static const struct genl_split_ops netdev_nl_ops[] = {
 		.flags	= GENL_CMD_CAP_DUMP,
 	},
 #endif /* CONFIG_PAGE_POOL_STATS */
+	{
+		.cmd		= NETDEV_CMD_QUEUE_GET,
+		.doit		= netdev_nl_queue_get_doit,
+		.policy		= netdev_queue_get_do_nl_policy,
+		.maxattr	= NETDEV_A_QUEUE_TYPE,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= NETDEV_CMD_QUEUE_GET,
+		.dumpit		= netdev_nl_queue_get_dumpit,
+		.policy		= netdev_queue_get_dump_nl_policy,
+		.maxattr	= NETDEV_A_QUEUE_IFINDEX,
+		.flags		= GENL_CMD_CAP_DUMP,
+	},
 };
 
 static const struct genl_multicast_group netdev_nl_mcgrps[] = {
diff --git a/net/core/netdev-genl-gen.h b/net/core/netdev-genl-gen.h
index 649e4b46eccf..086623c1797a 100644
--- a/net/core/netdev-genl-gen.h
+++ b/net/core/netdev-genl-gen.h
@@ -23,6 +23,9 @@ int netdev_nl_page_pool_stats_get_doit(struct sk_buff *skb,
 				       struct genl_info *info);
 int netdev_nl_page_pool_stats_get_dumpit(struct sk_buff *skb,
 					 struct netlink_callback *cb);
+int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info);
+int netdev_nl_queue_get_dumpit(struct sk_buff *skb,
+			       struct netlink_callback *cb);
 
 enum {
 	NETDEV_NLGRP_MGMT,
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 10f2124e9e23..35e2d692f651 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -140,6 +140,16 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
+int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	return -EOPNOTSUPP;
+}
+
+int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return -EOPNOTSUPP;
+}
+
 static int netdev_genl_netdevice_event(struct notifier_block *nb,
 				       unsigned long event, void *ptr)
 {
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 6244c0164976..f857960a7f06 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -62,6 +62,11 @@ enum netdev_xsk_flags {
 	NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
 };
 
+enum netdev_queue_type {
+	NETDEV_QUEUE_TYPE_RX,
+	NETDEV_QUEUE_TYPE_TX,
+};
+
 enum {
 	NETDEV_A_DEV_IFINDEX = 1,
 	NETDEV_A_DEV_PAD,
@@ -104,6 +109,16 @@ enum {
 	NETDEV_A_PAGE_POOL_STATS_MAX = (__NETDEV_A_PAGE_POOL_STATS_MAX - 1)
 };
 
+enum {
+	NETDEV_A_QUEUE_ID = 1,
+	NETDEV_A_QUEUE_IFINDEX,
+	NETDEV_A_QUEUE_TYPE,
+	NETDEV_A_QUEUE_NAPI_ID,
+
+	__NETDEV_A_QUEUE_MAX,
+	NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1)
+};
+
 enum {
 	NETDEV_CMD_DEV_GET = 1,
 	NETDEV_CMD_DEV_ADD_NTF,
@@ -114,6 +129,7 @@ enum {
 	NETDEV_CMD_PAGE_POOL_DEL_NTF,
 	NETDEV_CMD_PAGE_POOL_CHANGE_NTF,
 	NETDEV_CMD_PAGE_POOL_STATS_GET,
+	NETDEV_CMD_QUEUE_GET,
 
 	__NETDEV_CMD_MAX,
 	NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)
diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c
index 3b9dee94d4ce..fbf7e24ade91 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -23,6 +23,7 @@ static const char * const netdev_op_strmap[] = {
 	[NETDEV_CMD_PAGE_POOL_DEL_NTF] = "page-pool-del-ntf",
 	[NETDEV_CMD_PAGE_POOL_CHANGE_NTF] = "page-pool-change-ntf",
 	[NETDEV_CMD_PAGE_POOL_STATS_GET] = "page-pool-stats-get",
+	[NETDEV_CMD_QUEUE_GET] = "queue-get",
 };
 
 const char *netdev_op_str(int op)
@@ -76,6 +77,18 @@ const char *netdev_xsk_flags_str(enum netdev_xsk_flags value)
 	return netdev_xsk_flags_strmap[value];
 }
 
+static const char * const netdev_queue_type_strmap[] = {
+	[0] = "rx",
+	[1] = "tx",
+};
+
+const char *netdev_queue_type_str(enum netdev_queue_type value)
+{
+	if (value < 0 || value >= (int)MNL_ARRAY_SIZE(netdev_queue_type_strmap))
+		return NULL;
+	return netdev_queue_type_strmap[value];
+}
+
 /* Policies */
 struct ynl_policy_attr netdev_page_pool_info_policy[NETDEV_A_PAGE_POOL_MAX + 1] = {
 	[NETDEV_A_PAGE_POOL_ID] = { .name = "id", .type = YNL_PT_UINT, },
@@ -135,6 +148,18 @@ struct ynl_policy_nest netdev_page_pool_stats_nest = {
 	.table = netdev_page_pool_stats_policy,
 };
 
+struct ynl_policy_attr netdev_queue_policy[NETDEV_A_QUEUE_MAX + 1] = {
+	[NETDEV_A_QUEUE_ID] = { .name = "id", .type = YNL_PT_U32, },
+	[NETDEV_A_QUEUE_IFINDEX] = { .name = "ifindex", .type = YNL_PT_U32, },
+	[NETDEV_A_QUEUE_TYPE] = { .name = "type", .type = YNL_PT_U32, },
+	[NETDEV_A_QUEUE_NAPI_ID] = { .name = "napi-id", .type = YNL_PT_U32, },
+};
+
+struct ynl_policy_nest netdev_queue_nest = {
+	.max_attr = NETDEV_A_QUEUE_MAX,
+	.table = netdev_queue_policy,
+};
+
 /* Common nested types */
 void netdev_page_pool_info_free(struct netdev_page_pool_info *obj)
 {
@@ -617,6 +642,134 @@ netdev_page_pool_stats_get_dump(struct ynl_sock *ys)
 	return NULL;
 }
 
+/* ============== NETDEV_CMD_QUEUE_GET ============== */
+/* NETDEV_CMD_QUEUE_GET - do */
+void netdev_queue_get_req_free(struct netdev_queue_get_req *req)
+{
+	free(req);
+}
+
+void netdev_queue_get_rsp_free(struct netdev_queue_get_rsp *rsp)
+{
+	free(rsp);
+}
+
+int netdev_queue_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
+{
+	struct ynl_parse_arg *yarg = data;
+	struct netdev_queue_get_rsp *dst;
+	const struct nlattr *attr;
+
+	dst = yarg->data;
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		unsigned int type = mnl_attr_get_type(attr);
+
+		if (type == NETDEV_A_QUEUE_ID) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.id = 1;
+			dst->id = mnl_attr_get_u32(attr);
+		} else if (type == NETDEV_A_QUEUE_TYPE) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.type = 1;
+			dst->type = mnl_attr_get_u32(attr);
+		} else if (type == NETDEV_A_QUEUE_NAPI_ID) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.napi_id = 1;
+			dst->napi_id = mnl_attr_get_u32(attr);
+		} else if (type == NETDEV_A_QUEUE_IFINDEX) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.ifindex = 1;
+			dst->ifindex = mnl_attr_get_u32(attr);
+		}
+	}
+
+	return MNL_CB_OK;
+}
+
+struct netdev_queue_get_rsp *
+netdev_queue_get(struct ynl_sock *ys, struct netdev_queue_get_req *req)
+{
+	struct ynl_req_state yrs = { .yarg = { .ys = ys, }, };
+	struct netdev_queue_get_rsp *rsp;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = ynl_gemsg_start_req(ys, ys->family_id, NETDEV_CMD_QUEUE_GET, 1);
+	ys->req_policy = &netdev_queue_nest;
+	yrs.yarg.rsp_policy = &netdev_queue_nest;
+
+	if (req->_present.ifindex)
+		mnl_attr_put_u32(nlh, NETDEV_A_QUEUE_IFINDEX, req->ifindex);
+	if (req->_present.type)
+		mnl_attr_put_u32(nlh, NETDEV_A_QUEUE_TYPE, req->type);
+	if (req->_present.id)
+		mnl_attr_put_u32(nlh, NETDEV_A_QUEUE_ID, req->id);
+
+	rsp = calloc(1, sizeof(*rsp));
+	yrs.yarg.data = rsp;
+	yrs.cb = netdev_queue_get_rsp_parse;
+	yrs.rsp_cmd = NETDEV_CMD_QUEUE_GET;
+
+	err = ynl_exec(ys, nlh, &yrs);
+	if (err < 0)
+		goto err_free;
+
+	return rsp;
+
+err_free:
+	netdev_queue_get_rsp_free(rsp);
+	return NULL;
+}
+
+/* NETDEV_CMD_QUEUE_GET - dump */
+void netdev_queue_get_list_free(struct netdev_queue_get_list *rsp)
+{
+	struct netdev_queue_get_list *next = rsp;
+
+	while ((void *)next != YNL_LIST_END) {
+		rsp = next;
+		next = rsp->next;
+
+		free(rsp);
+	}
+}
+
+struct netdev_queue_get_list *
+netdev_queue_get_dump(struct ynl_sock *ys,
+		      struct netdev_queue_get_req_dump *req)
+{
+	struct ynl_dump_state yds = {};
+	struct nlmsghdr *nlh;
+	int err;
+
+	yds.ys = ys;
+	yds.alloc_sz = sizeof(struct netdev_queue_get_list);
+	yds.cb = netdev_queue_get_rsp_parse;
+	yds.rsp_cmd = NETDEV_CMD_QUEUE_GET;
+	yds.rsp_policy = &netdev_queue_nest;
+
+	nlh = ynl_gemsg_start_dump(ys, ys->family_id, NETDEV_CMD_QUEUE_GET, 1);
+	ys->req_policy = &netdev_queue_nest;
+
+	if (req->_present.ifindex)
+		mnl_attr_put_u32(nlh, NETDEV_A_QUEUE_IFINDEX, req->ifindex);
+
+	err = ynl_exec_dump(ys, nlh, &yds);
+	if (err < 0)
+		goto free_list;
+
+	return yds.first;
+
+free_list:
+	netdev_queue_get_list_free(yds.first);
+	return NULL;
+}
+
 static const struct ynl_ntf_info netdev_ntf_info[] =  {
 	[NETDEV_CMD_DEV_ADD_NTF] =  {
 		.alloc_sz	= sizeof(struct netdev_dev_get_ntf),
diff --git a/tools/net/ynl/generated/netdev-user.h b/tools/net/ynl/generated/netdev-user.h
index cc3d80d1cf8c..d7daf6df3df0 100644
--- a/tools/net/ynl/generated/netdev-user.h
+++ b/tools/net/ynl/generated/netdev-user.h
@@ -20,6 +20,7 @@ const char *netdev_op_str(int op);
 const char *netdev_xdp_act_str(enum netdev_xdp_act value);
 const char *netdev_xdp_rx_metadata_str(enum netdev_xdp_rx_metadata value);
 const char *netdev_xsk_flags_str(enum netdev_xsk_flags value);
+const char *netdev_queue_type_str(enum netdev_queue_type value);
 
 /* Common nested types */
 struct netdev_page_pool_info {
@@ -261,4 +262,102 @@ netdev_page_pool_stats_get_list_free(struct netdev_page_pool_stats_get_list *rsp
 struct netdev_page_pool_stats_get_list *
 netdev_page_pool_stats_get_dump(struct ynl_sock *ys);
 
+/* ============== NETDEV_CMD_QUEUE_GET ============== */
+/* NETDEV_CMD_QUEUE_GET - do */
+struct netdev_queue_get_req {
+	struct {
+		__u32 ifindex:1;
+		__u32 type:1;
+		__u32 id:1;
+	} _present;
+
+	__u32 ifindex;
+	enum netdev_queue_type type;
+	__u32 id;
+};
+
+static inline struct netdev_queue_get_req *netdev_queue_get_req_alloc(void)
+{
+	return calloc(1, sizeof(struct netdev_queue_get_req));
+}
+void netdev_queue_get_req_free(struct netdev_queue_get_req *req);
+
+static inline void
+netdev_queue_get_req_set_ifindex(struct netdev_queue_get_req *req,
+				 __u32 ifindex)
+{
+	req->_present.ifindex = 1;
+	req->ifindex = ifindex;
+}
+static inline void
+netdev_queue_get_req_set_type(struct netdev_queue_get_req *req,
+			      enum netdev_queue_type type)
+{
+	req->_present.type = 1;
+	req->type = type;
+}
+static inline void
+netdev_queue_get_req_set_id(struct netdev_queue_get_req *req, __u32 id)
+{
+	req->_present.id = 1;
+	req->id = id;
+}
+
+struct netdev_queue_get_rsp {
+	struct {
+		__u32 id:1;
+		__u32 type:1;
+		__u32 napi_id:1;
+		__u32 ifindex:1;
+	} _present;
+
+	__u32 id;
+	enum netdev_queue_type type;
+	__u32 napi_id;
+	__u32 ifindex;
+};
+
+void netdev_queue_get_rsp_free(struct netdev_queue_get_rsp *rsp);
+
+/*
+ * Get queue information from the kernel. Only configured queues will be reported (as opposed to all available hardware queues).
+ */
+struct netdev_queue_get_rsp *
+netdev_queue_get(struct ynl_sock *ys, struct netdev_queue_get_req *req);
+
+/* NETDEV_CMD_QUEUE_GET - dump */
+struct netdev_queue_get_req_dump {
+	struct {
+		__u32 ifindex:1;
+	} _present;
+
+	__u32 ifindex;
+};
+
+static inline struct netdev_queue_get_req_dump *
+netdev_queue_get_req_dump_alloc(void)
+{
+	return calloc(1, sizeof(struct netdev_queue_get_req_dump));
+}
+void netdev_queue_get_req_dump_free(struct netdev_queue_get_req_dump *req);
+
+static inline void
+netdev_queue_get_req_dump_set_ifindex(struct netdev_queue_get_req_dump *req,
+				      __u32 ifindex)
+{
+	req->_present.ifindex = 1;
+	req->ifindex = ifindex;
+}
+
+struct netdev_queue_get_list {
+	struct netdev_queue_get_list *next;
+	struct netdev_queue_get_rsp obj __attribute__((aligned(8)));
+};
+
+void netdev_queue_get_list_free(struct netdev_queue_get_list *rsp);
+
+struct netdev_queue_get_list *
+netdev_queue_get_dump(struct ynl_sock *ys,
+		      struct netdev_queue_get_req_dump *req);
+
 #endif /* _LINUX_NETDEV_GEN_H */

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