[net-next PATCH v2 0/9] Introduce NAPI queues support

[net-next PATCH v2 0/9] Introduce NAPI queues support

[Amritha Nambiar]

Introduce support for associating NAPI instances with
corresponding RX and TX queue set. Add the capability
to export NAPI information supported by the device.
Extend the netdev_genl generic netlink family for netdev
with NAPI data. The NAPI fields exposed are:
- NAPI id
- NAPI device ifindex
- queue/queue-set (both RX and TX) associated with each
  NAPI instance
- Interrupt number associated with the NAPI instance
- PID for the NAPI thread

This series only supports 'get' ability for retrieving
certain NAPI attributes. The 'set' ability for setting
queue[s] associated with a NAPI instance via netdev-genl
will be submitted as a separate patch series.

Previous discussion at:
https://lore.kernel.org/netdev/c8476530638a5f4381d64db0e024ed49c2db3b02.camel@gmail.com/T/#m00999652a8b4731fbdb7bf698d2e3666c65a60e7

$ ./cli.py --spec netdev.yaml --do napi-get --json='{"napi-id": 385}'
{'ifindex': 12,
 'irq': 291,
 'napi-id': 385,
 'pid': 3614,
 'rx-queues': [0],
 'tx-queues': [0]}

$ ./cli.py --spec netdev.yaml --dump napi-get --json='{"ifindex": 12}'
[{'ifindex': 12,
  'irq': 294,
  'napi-id': 596,
  'pid': 12361,
  'rx-queues': [3],
  'tx-queues': [3]},
 {'ifindex': 12,
  'irq': 293,
  'napi-id': 595,
  'pid': 12360,
  'rx-queues': [2],
  'tx-queues': [2]},
 {'ifindex': 12,
  'irq': 292,
  'napi-id': 594,
  'pid': 12359,
  'rx-queues': [1],
  'tx-queues': [1]},
 {'ifindex': 12,
  'irq': 291,
  'napi-id': 593,
  'pid': 12358,
  'rx-queues': [0],
  'tx-queues': [0]}]

v2 -> v1
* Removed multi-attr nest for NAPI object
* Added support for flat/individual NAPI objects
* Changed 'do' command to take napi-id as argument
* Supported filtered 'dump' (dump with ifindex for a netdev and dump for
  all netdevs)

RFC -> v1
* Changed to separate 'napi_get' command
* Added support to expose interrupt and PID for the NAPI
* Used list of netdev queue structs
* Split patches further and fixed code style and errors

---

Amritha Nambiar (9):
      net: Introduce new fields for napi and queue associations
      ice: Add support in the driver for associating napi with queue[s]
      netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI
      net: Move kernel helpers for queue index outside sysfs
      netdev-genl: Add netlink framework functions for napi
      netdev-genl: spec: Add irq in netdev netlink YAML spec
      net: Add NAPI IRQ support
      netdev-genl: spec: Add PID in netdev netlink YAML spec
      netdev-genl: Add PID for the NAPI thread


 Documentation/netlink/specs/netdev.yaml   |   52 ++++++++
 drivers/net/ethernet/intel/ice/ice_lib.c  |   60 ++++++++++
 drivers/net/ethernet/intel/ice/ice_lib.h  |    4 +
 drivers/net/ethernet/intel/ice/ice_main.c |    4 -
 include/linux/netdevice.h                 |   34 +++++
 include/net/netdev_rx_queue.h             |    7 +
 include/uapi/linux/netdev.h               |   13 ++
 net/core/dev.c                            |   53 ++++++++
 net/core/net-sysfs.c                      |   11 --
 net/core/netdev-genl-gen.c                |   24 ++++
 net/core/netdev-genl-gen.h                |    2 
 net/core/netdev-genl.c                    |  182 +++++++++++++++++++++++++++++
 tools/include/uapi/linux/netdev.h         |   13 ++
 tools/net/ynl/generated/netdev-user.c     |  177 ++++++++++++++++++++++++++++
 tools/net/ynl/generated/netdev-user.h     |   83 +++++++++++++
 tools/net/ynl/ynl-gen-c.py                |    2 
 16 files changed, 704 insertions(+), 17 deletions(-)

--

[net-next PATCH v2 1/9] net: Introduce new fields for napi and queue associations

[Amritha Nambiar]

Add the napi pointer in netdev queue for tracking the napi
instance for each queue. This achieves the queue<->napi mapping.

Introduce new napi fields 'napi_rxq_list' and 'napi_txq_list'
for rx and tx queue set associated with the napi. Add functions
to associate the queue with the napi and handle their removal
as well. This lists the queue/queue-set on the corresponding
irq line for each napi instance.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 include/linux/netdevice.h     |   16 +++++++++++++
 include/net/netdev_rx_queue.h |    3 ++
 net/core/dev.c                |   52 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0896aaa91dd7..7645c0ba0995 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -346,6 +346,14 @@ struct gro_list {
  */
 #define GRO_HASH_BUCKETS	8
 
+/*
+ * napi queue container type
+ */
+enum q_type {
+	QUEUE_RX,
+	QUEUE_TX,
+};
+
 /*
  * Structure for NAPI scheduling similar to tasklet but with weighting
  */
@@ -380,6 +388,8 @@ struct napi_struct {
 	/* control-path-only fields follow */
 	struct list_head	dev_list;
 	struct hlist_node	napi_hash_node;
+	struct list_head	napi_rxq_list;
+	struct list_head	napi_txq_list;
 };
 
 enum {
@@ -655,6 +665,9 @@ struct netdev_queue {
 
 	unsigned long		state;
 
+	/* NAPI instance for the queue */
+	struct napi_struct      *napi;
+	struct list_head        q_list;
 #ifdef CONFIG_BQL
 	struct dql		dql;
 #endif
@@ -2609,6 +2622,9 @@ static inline void *netdev_priv(const struct net_device *dev)
  */
 #define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))
 
+int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
+			 enum q_type type);
+
 /* Default NAPI poll() weight
  * Device drivers are strongly advised to not use bigger value
  */
diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
index cdcafb30d437..66bda0dfe71c 100644
--- a/include/net/netdev_rx_queue.h
+++ b/include/net/netdev_rx_queue.h
@@ -21,6 +21,9 @@ struct netdev_rx_queue {
 #ifdef CONFIG_XDP_SOCKETS
 	struct xsk_buff_pool            *pool;
 #endif
+	struct list_head		q_list;
+	/* NAPI instance for the queue */
+	struct napi_struct		*napi;
 } ____cacheline_aligned_in_smp;
 
 /*
diff --git a/net/core/dev.c b/net/core/dev.c
index 17e6281e408c..ec4c469c9e1d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6391,6 +6391,42 @@ int dev_set_threaded(struct net_device *dev, bool threaded)
 }
 EXPORT_SYMBOL(dev_set_threaded);
 
+/**
+ * netif_napi_add_queue - Associate queue with the napi
+ * @napi: NAPI context
+ * @queue_index: Index of queue
+ * @type: queue type as RX or TX
+ *
+ * Add queue with its corresponding napi context
+ */
+int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
+			 enum q_type type)
+{
+	struct net_device *dev = napi->dev;
+	struct netdev_rx_queue *rxq;
+	struct netdev_queue *txq;
+
+	if (!dev)
+		return -EINVAL;
+
+	switch (type) {
+	case QUEUE_RX:
+		rxq = __netif_get_rx_queue(dev, queue_index);
+		rxq->napi = napi;
+		list_add_rcu(&rxq->q_list, &napi->napi_rxq_list);
+		break;
+	case QUEUE_TX:
+		txq = netdev_get_tx_queue(dev, queue_index);
+		txq->napi = napi;
+		list_add_rcu(&txq->q_list, &napi->napi_txq_list);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(netif_napi_add_queue);
+
 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
 			   int (*poll)(struct napi_struct *, int), int weight)
 {
@@ -6426,6 +6462,9 @@ void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
 	 */
 	if (dev->threaded && napi_kthread_create(napi))
 		dev->threaded = 0;
+
+	INIT_LIST_HEAD(&napi->napi_rxq_list);
+	INIT_LIST_HEAD(&napi->napi_txq_list);
 }
 EXPORT_SYMBOL(netif_napi_add_weight);
 
@@ -6487,6 +6526,18 @@ static void flush_gro_hash(struct napi_struct *napi)
 	}
 }
 
+static void napi_del_queues(struct napi_struct *napi)
+{
+	struct netdev_rx_queue *rx_queue, *rxq;
+	struct netdev_queue *tx_queue, *txq;
+
+	list_for_each_entry_safe(rx_queue, rxq, &napi->napi_rxq_list, q_list)
+		list_del_rcu(&rx_queue->q_list);
+
+	list_for_each_entry_safe(tx_queue, txq, &napi->napi_txq_list, q_list)
+		list_del_rcu(&tx_queue->q_list);
+}
+
 /* Must be called in process context */
 void __netif_napi_del(struct napi_struct *napi)
 {
@@ -6504,6 +6555,7 @@ void __netif_napi_del(struct napi_struct *napi)
 		kthread_stop(napi->thread);
 		napi->thread = NULL;
 	}
+	napi_del_queues(napi);
 }
 EXPORT_SYMBOL(__netif_napi_del);
 

[net-next PATCH v2 2/9] ice: Add support in the driver for associating napi with queue[s]

[Amritha Nambiar]

After the napi context is initialized, map the napi instance
with the queue/queue-set on the corresponding irq line.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_lib.c  |   57 +++++++++++++++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_lib.h  |    4 ++
 drivers/net/ethernet/intel/ice/ice_main.c |    4 ++
 3 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 201570cd2e0b..c2b9a25db139 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -2461,6 +2461,12 @@ ice_vsi_cfg_def(struct ice_vsi *vsi, struct ice_vsi_cfg_params *params)
 			goto unroll_vector_base;
 
 		ice_vsi_map_rings_to_vectors(vsi);
+
+		/* Associate q_vector rings to napi */
+		ret = ice_vsi_add_napi_queues(vsi);
+		if (ret)
+			goto unroll_vector_base;
+
 		vsi->stat_offsets_loaded = false;
 
 		if (ice_is_xdp_ena_vsi(vsi)) {
@@ -2940,6 +2946,57 @@ void ice_vsi_dis_irq(struct ice_vsi *vsi)
 		synchronize_irq(vsi->q_vectors[i]->irq.virq);
 }
 
+/**
+ * ice_q_vector_add_napi_queues - Add queue[s] associated with the napi
+ * @q_vector: q_vector pointer
+ *
+ * Associate the q_vector napi with all the queue[s] on the vector
+ * Returns 0 on success or < 0 on error
+ */
+int ice_q_vector_add_napi_queues(struct ice_q_vector *q_vector)
+{
+	struct ice_rx_ring *rx_ring;
+	struct ice_tx_ring *tx_ring;
+	int ret = 0;
+
+	ice_for_each_rx_ring(rx_ring, q_vector->rx) {
+		ret = netif_napi_add_queue(&q_vector->napi, rx_ring->q_index,
+					   QUEUE_RX);
+		if (ret)
+			return ret;
+	}
+	ice_for_each_tx_ring(tx_ring, q_vector->tx) {
+		ret = netif_napi_add_queue(&q_vector->napi, tx_ring->q_index,
+					   QUEUE_TX);
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}
+
+/**
+ * ice_vsi_add_napi_queues
+ * @vsi: VSI pointer
+ *
+ * Associate queue[s] with napi for all vectors
+ * Returns 0 on success or < 0 on error
+ */
+int ice_vsi_add_napi_queues(struct ice_vsi *vsi)
+{
+	int i, ret = 0;
+
+	if (!vsi->netdev)
+		return ret;
+
+	ice_for_each_q_vector(vsi, i) {
+		ret = ice_q_vector_add_napi_queues(vsi->q_vectors[i]);
+		if (ret)
+			return ret;
+	}
+	return ret;
+}
+
 /**
  * ice_vsi_release - Delete a VSI and free its resources
  * @vsi: the VSI being removed
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.h b/drivers/net/ethernet/intel/ice/ice_lib.h
index f24f5d1e6f9c..21d164ac1eed 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_lib.h
@@ -91,6 +91,10 @@ void ice_vsi_cfg_netdev_tc(struct ice_vsi *vsi, u8 ena_tc);
 struct ice_vsi *
 ice_vsi_setup(struct ice_pf *pf, struct ice_vsi_cfg_params *params);
 
+int ice_q_vector_add_napi_queues(struct ice_q_vector *q_vector);
+
+int ice_vsi_add_napi_queues(struct ice_vsi *vsi);
+
 int ice_vsi_release(struct ice_vsi *vsi);
 
 void ice_vsi_close(struct ice_vsi *vsi);
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index c8286adae946..bb6be2182a7f 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3374,9 +3374,11 @@ static void ice_napi_add(struct ice_vsi *vsi)
 	if (!vsi->netdev)
 		return;
 
-	ice_for_each_q_vector(vsi, v_idx)
+	ice_for_each_q_vector(vsi, v_idx) {
 		netif_napi_add(vsi->netdev, &vsi->q_vectors[v_idx]->napi,
 			       ice_napi_poll);
+		ice_q_vector_add_napi_queues(vsi->q_vectors[v_idx]);
+	}
 }
 
 /**

[net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Amritha Nambiar]

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

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 Documentation/netlink/specs/netdev.yaml |   42 ++++++++
 include/uapi/linux/netdev.h             |   11 ++
 net/core/netdev-genl-gen.c              |   24 +++++
 net/core/netdev-genl-gen.h              |    2 
 net/core/netdev-genl.c                  |   10 ++
 tools/include/uapi/linux/netdev.h       |   11 ++
 tools/net/ynl/generated/netdev-user.c   |  165 +++++++++++++++++++++++++++++++
 tools/net/ynl/generated/netdev-user.h   |   79 +++++++++++++++
 8 files changed, 344 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 1c7284fd535b..a068cf3b5a7e 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -68,6 +68,29 @@ attribute-sets:
         type: u32
         checks:
           min: 1
+  -
+    name: napi
+    attributes:
+      -
+        name: ifindex
+        doc: netdev ifindex
+        type: u32
+        checks:
+          min: 1
+      -
+        name: napi-id
+        doc: napi id
+        type: u32
+      -
+        name: rx-queues
+        doc: list of rx queues associated with a napi
+        type: u32
+        multi-attr: true
+      -
+        name: tx-queues
+        doc: list of tx queues associated with a napi
+        type: u32
+        multi-attr: true
 
 operations:
   list:
@@ -101,6 +124,25 @@ operations:
       doc: Notification about device configuration being changed.
       notify: dev-get
       mcgrp: mgmt
+    -
+      name: napi-get
+      doc: napi information such as napi-id, napi queues etc.
+      attribute-set: napi
+      do:
+        request:
+          attributes:
+            - napi-id
+        reply: &napi-get-op
+          attributes:
+            - napi-id
+            - ifindex
+            - rx-queues
+            - tx-queues
+      dump:
+        request:
+          attributes:
+            - ifindex
+        reply: *napi-get-op
 
 mcast-groups:
   list:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index c1634b95c223..28f6bad7c48e 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -48,11 +48,22 @@ enum {
 	NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1)
 };
 
+enum {
+	NETDEV_A_NAPI_IFINDEX = 1,
+	NETDEV_A_NAPI_NAPI_ID,
+	NETDEV_A_NAPI_RX_QUEUES,
+	NETDEV_A_NAPI_TX_QUEUES,
+
+	__NETDEV_A_NAPI_MAX,
+	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
+};
+
 enum {
 	NETDEV_CMD_DEV_GET = 1,
 	NETDEV_CMD_DEV_ADD_NTF,
 	NETDEV_CMD_DEV_DEL_NTF,
 	NETDEV_CMD_DEV_CHANGE_NTF,
+	NETDEV_CMD_NAPI_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 ea9231378aa6..37cce2d64a14 100644
--- a/net/core/netdev-genl-gen.c
+++ b/net/core/netdev-genl-gen.c
@@ -15,6 +15,16 @@ static const struct nla_policy netdev_dev_get_nl_policy[NETDEV_A_DEV_IFINDEX + 1
 	[NETDEV_A_DEV_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
 };
 
+/* NETDEV_CMD_NAPI_GET - do */
+static const struct nla_policy netdev_napi_get_do_nl_policy[NETDEV_A_NAPI_NAPI_ID + 1] = {
+	[NETDEV_A_NAPI_NAPI_ID] = { .type = NLA_U32, },
+};
+
+/* NETDEV_CMD_NAPI_GET - dump */
+static const struct nla_policy netdev_napi_get_dump_nl_policy[NETDEV_A_NAPI_IFINDEX + 1] = {
+	[NETDEV_A_NAPI_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+};
+
 /* Ops table for netdev */
 static const struct genl_split_ops netdev_nl_ops[] = {
 	{
@@ -29,6 +39,20 @@ static const struct genl_split_ops netdev_nl_ops[] = {
 		.dumpit	= netdev_nl_dev_get_dumpit,
 		.flags	= GENL_CMD_CAP_DUMP,
 	},
+	{
+		.cmd		= NETDEV_CMD_NAPI_GET,
+		.doit		= netdev_nl_napi_get_doit,
+		.policy		= netdev_napi_get_do_nl_policy,
+		.maxattr	= NETDEV_A_NAPI_NAPI_ID,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= NETDEV_CMD_NAPI_GET,
+		.dumpit		= netdev_nl_napi_get_dumpit,
+		.policy		= netdev_napi_get_dump_nl_policy,
+		.maxattr	= NETDEV_A_NAPI_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 7b370c073e7d..46dab8ccd568 100644
--- a/net/core/netdev-genl-gen.h
+++ b/net/core/netdev-genl-gen.h
@@ -13,6 +13,8 @@
 
 int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info);
 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
+int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info);
+int netdev_nl_napi_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 c1aea8b756b6..b146679d6112 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -119,6 +119,16 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
+int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	return -EOPNOTSUPP;
+}
+
+int netdev_nl_napi_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 c1634b95c223..28f6bad7c48e 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -48,11 +48,22 @@ enum {
 	NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1)
 };
 
+enum {
+	NETDEV_A_NAPI_IFINDEX = 1,
+	NETDEV_A_NAPI_NAPI_ID,
+	NETDEV_A_NAPI_RX_QUEUES,
+	NETDEV_A_NAPI_TX_QUEUES,
+
+	__NETDEV_A_NAPI_MAX,
+	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
+};
+
 enum {
 	NETDEV_CMD_DEV_GET = 1,
 	NETDEV_CMD_DEV_ADD_NTF,
 	NETDEV_CMD_DEV_DEL_NTF,
 	NETDEV_CMD_DEV_CHANGE_NTF,
+	NETDEV_CMD_NAPI_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 68b408ca0f7f..0cc8c0151b36 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -18,6 +18,7 @@ static const char * const netdev_op_strmap[] = {
 	[NETDEV_CMD_DEV_ADD_NTF] = "dev-add-ntf",
 	[NETDEV_CMD_DEV_DEL_NTF] = "dev-del-ntf",
 	[NETDEV_CMD_DEV_CHANGE_NTF] = "dev-change-ntf",
+	[NETDEV_CMD_NAPI_GET] = "napi-get",
 };
 
 const char *netdev_op_str(int op)
@@ -58,6 +59,18 @@ struct ynl_policy_nest netdev_dev_nest = {
 	.table = netdev_dev_policy,
 };
 
+struct ynl_policy_attr netdev_napi_policy[NETDEV_A_NAPI_MAX + 1] = {
+	[NETDEV_A_NAPI_IFINDEX] = { .name = "ifindex", .type = YNL_PT_U32, },
+	[NETDEV_A_NAPI_NAPI_ID] = { .name = "napi-id", .type = YNL_PT_U32, },
+	[NETDEV_A_NAPI_RX_QUEUES] = { .name = "rx-queues", .type = YNL_PT_U32, },
+	[NETDEV_A_NAPI_TX_QUEUES] = { .name = "tx-queues", .type = YNL_PT_U32, },
+};
+
+struct ynl_policy_nest netdev_napi_nest = {
+	.max_attr = NETDEV_A_NAPI_MAX,
+	.table = netdev_napi_policy,
+};
+
 /* Common nested types */
 /* ============== NETDEV_CMD_DEV_GET ============== */
 /* NETDEV_CMD_DEV_GET - do */
@@ -178,6 +191,158 @@ void netdev_dev_get_ntf_free(struct netdev_dev_get_ntf *rsp)
 	free(rsp);
 }
 
+/* ============== NETDEV_CMD_NAPI_GET ============== */
+/* NETDEV_CMD_NAPI_GET - do */
+void netdev_napi_get_req_free(struct netdev_napi_get_req *req)
+{
+	free(req);
+}
+
+void netdev_napi_get_rsp_free(struct netdev_napi_get_rsp *rsp)
+{
+	free(rsp->rx_queues);
+	free(rsp->tx_queues);
+	free(rsp);
+}
+
+int netdev_napi_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
+{
+	struct ynl_parse_arg *yarg = data;
+	struct netdev_napi_get_rsp *dst;
+	unsigned int n_rx_queues = 0;
+	unsigned int n_tx_queues = 0;
+	const struct nlattr *attr;
+	int i;
+
+	dst = yarg->data;
+
+	if (dst->rx_queues)
+		return ynl_error_parse(yarg, "attribute already present (napi.rx-queues)");
+	if (dst->tx_queues)
+		return ynl_error_parse(yarg, "attribute already present (napi.tx-queues)");
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		unsigned int type = mnl_attr_get_type(attr);
+
+		if (type == NETDEV_A_NAPI_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_NAPI_IFINDEX) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.ifindex = 1;
+			dst->ifindex = mnl_attr_get_u32(attr);
+		} else if (type == NETDEV_A_NAPI_RX_QUEUES) {
+			n_rx_queues++;
+		} else if (type == NETDEV_A_NAPI_TX_QUEUES) {
+			n_tx_queues++;
+		}
+	}
+
+	if (n_rx_queues) {
+		dst->rx_queues = calloc(n_rx_queues, sizeof(*dst->rx_queues));
+		dst->n_rx_queues = n_rx_queues;
+		i = 0;
+		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+			if (mnl_attr_get_type(attr) == NETDEV_A_NAPI_RX_QUEUES) {
+				dst->rx_queues[i] = mnl_attr_get_u32(attr);
+				i++;
+			}
+		}
+	}
+	if (n_tx_queues) {
+		dst->tx_queues = calloc(n_tx_queues, sizeof(*dst->tx_queues));
+		dst->n_tx_queues = n_tx_queues;
+		i = 0;
+		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+			if (mnl_attr_get_type(attr) == NETDEV_A_NAPI_TX_QUEUES) {
+				dst->tx_queues[i] = mnl_attr_get_u32(attr);
+				i++;
+			}
+		}
+	}
+
+	return MNL_CB_OK;
+}
+
+struct netdev_napi_get_rsp *
+netdev_napi_get(struct ynl_sock *ys, struct netdev_napi_get_req *req)
+{
+	struct ynl_req_state yrs = { .yarg = { .ys = ys, }, };
+	struct netdev_napi_get_rsp *rsp;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = ynl_gemsg_start_req(ys, ys->family_id, NETDEV_CMD_NAPI_GET, 1);
+	ys->req_policy = &netdev_napi_nest;
+	yrs.yarg.rsp_policy = &netdev_napi_nest;
+
+	if (req->_present.napi_id)
+		mnl_attr_put_u32(nlh, NETDEV_A_NAPI_NAPI_ID, req->napi_id);
+
+	rsp = calloc(1, sizeof(*rsp));
+	yrs.yarg.data = rsp;
+	yrs.cb = netdev_napi_get_rsp_parse;
+	yrs.rsp_cmd = NETDEV_CMD_NAPI_GET;
+
+	err = ynl_exec(ys, nlh, &yrs);
+	if (err < 0)
+		goto err_free;
+
+	return rsp;
+
+err_free:
+	netdev_napi_get_rsp_free(rsp);
+	return NULL;
+}
+
+/* NETDEV_CMD_NAPI_GET - dump */
+void netdev_napi_get_list_free(struct netdev_napi_get_list *rsp)
+{
+	struct netdev_napi_get_list *next = rsp;
+
+	while ((void *)next != YNL_LIST_END) {
+		rsp = next;
+		next = rsp->next;
+
+		free(rsp->obj.rx_queues);
+		free(rsp->obj.tx_queues);
+		free(rsp);
+	}
+}
+
+struct netdev_napi_get_list *
+netdev_napi_get_dump(struct ynl_sock *ys, struct netdev_napi_get_req_dump *req)
+{
+	struct ynl_dump_state yds = {};
+	struct nlmsghdr *nlh;
+	int err;
+
+	yds.ys = ys;
+	yds.alloc_sz = sizeof(struct netdev_napi_get_list);
+	yds.cb = netdev_napi_get_rsp_parse;
+	yds.rsp_cmd = NETDEV_CMD_NAPI_GET;
+	yds.rsp_policy = &netdev_napi_nest;
+
+	nlh = ynl_gemsg_start_dump(ys, ys->family_id, NETDEV_CMD_NAPI_GET, 1);
+	ys->req_policy = &netdev_napi_nest;
+
+	if (req->_present.ifindex)
+		mnl_attr_put_u32(nlh, NETDEV_A_NAPI_IFINDEX, req->ifindex);
+
+	err = ynl_exec_dump(ys, nlh, &yds);
+	if (err < 0)
+		goto free_list;
+
+	return yds.first;
+
+free_list:
+	netdev_napi_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 0952d3261f4d..742cb37b6844 100644
--- a/tools/net/ynl/generated/netdev-user.h
+++ b/tools/net/ynl/generated/netdev-user.h
@@ -84,4 +84,83 @@ struct netdev_dev_get_ntf {
 
 void netdev_dev_get_ntf_free(struct netdev_dev_get_ntf *rsp);
 
+/* ============== NETDEV_CMD_NAPI_GET ============== */
+/* NETDEV_CMD_NAPI_GET - do */
+struct netdev_napi_get_req {
+	struct {
+		__u32 napi_id:1;
+	} _present;
+
+	__u32 napi_id;
+};
+
+static inline struct netdev_napi_get_req *netdev_napi_get_req_alloc(void)
+{
+	return calloc(1, sizeof(struct netdev_napi_get_req));
+}
+void netdev_napi_get_req_free(struct netdev_napi_get_req *req);
+
+static inline void
+netdev_napi_get_req_set_napi_id(struct netdev_napi_get_req *req, __u32 napi_id)
+{
+	req->_present.napi_id = 1;
+	req->napi_id = napi_id;
+}
+
+struct netdev_napi_get_rsp {
+	struct {
+		__u32 napi_id:1;
+		__u32 ifindex:1;
+	} _present;
+
+	__u32 napi_id;
+	__u32 ifindex;
+	unsigned int n_rx_queues;
+	__u32 *rx_queues;
+	unsigned int n_tx_queues;
+	__u32 *tx_queues;
+};
+
+void netdev_napi_get_rsp_free(struct netdev_napi_get_rsp *rsp);
+
+/*
+ * napi information such as napi-id, napi queues etc.
+ */
+struct netdev_napi_get_rsp *
+netdev_napi_get(struct ynl_sock *ys, struct netdev_napi_get_req *req);
+
+/* NETDEV_CMD_NAPI_GET - dump */
+struct netdev_napi_get_req_dump {
+	struct {
+		__u32 ifindex:1;
+	} _present;
+
+	__u32 ifindex;
+};
+
+static inline struct netdev_napi_get_req_dump *
+netdev_napi_get_req_dump_alloc(void)
+{
+	return calloc(1, sizeof(struct netdev_napi_get_req_dump));
+}
+void netdev_napi_get_req_dump_free(struct netdev_napi_get_req_dump *req);
+
+static inline void
+netdev_napi_get_req_dump_set_ifindex(struct netdev_napi_get_req_dump *req,
+				     __u32 ifindex)
+{
+	req->_present.ifindex = 1;
+	req->ifindex = ifindex;
+}
+
+struct netdev_napi_get_list {
+	struct netdev_napi_get_list *next;
+	struct netdev_napi_get_rsp obj __attribute__ ((aligned (8)));
+};
+
+void netdev_napi_get_list_free(struct netdev_napi_get_list *rsp);
+
+struct netdev_napi_get_list *
+netdev_napi_get_dump(struct ynl_sock *ys, struct netdev_napi_get_req_dump *req);
+
 #endif /* _LINUX_NETDEV_GEN_H */

Re: [net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Jakub Kicinski]

On Mon, 21 Aug 2023 16:25:25 -0700 Amritha Nambiar wrote:
> +      -
> +        name: rx-queues
> +        doc: list of rx queues associated with a napi
> +        type: u32
> +        multi-attr: true
> +      -
> +        name: tx-queues
> +        doc: list of tx queues associated with a napi
> +        type: u32
> +        multi-attr: true

Queues should be separate objects, with NAPI ID as their attr.
That's much simpler - since the relation is 1:n it's easier 
to store it on the side of the "1".

Re: [net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Nambiar, Amritha]

On 8/22/2023 5:39 PM, Jakub Kicinski wrote:
> On Mon, 21 Aug 2023 16:25:25 -0700 Amritha Nambiar wrote:
>> +      -
>> +        name: rx-queues
>> +        doc: list of rx queues associated with a napi
>> +        type: u32
>> +        multi-attr: true
>> +      -
>> +        name: tx-queues
>> +        doc: list of tx queues associated with a napi
>> +        type: u32
>> +        multi-attr: true
> 
> Queues should be separate objects, with NAPI ID as their attr.
> That's much simpler - since the relation is 1:n it's easier
> to store it on the side of the "1".
> 

For the "napi-get" command to generate an output as below:

{'napi-id': 385, 'ifindex': 12, 'irq': 291, 'pid': 3614, 'rx-queues': 
[0,1,2], 'tx-queues': [0,1,2]},

wouldn't the napi attribute-set need an attribute for the list of queue 
IDs for the display ?

Internally, I can change the implementation in patch 1/9 to what we 
discussed previously (remove maintaining the napi_rxq/txq_list within 
napi, make use of the NAPI pointer in queue struct that stores the state 
on the side of "1" for 1:n. This would although change the complexity to 
#napis * (#max_rx + #max_tx). Currently it is #napis * 
(len(napi_rxq_list) + len(napi_txq_list)).

But, to display the list of queue IDs for the NAPI with napi-get, 
wouldn't the YAML still need such an attribute within the NAPI object? 
Or are you suggesting that the "napi-get" command does not need to show 
the queue-list associated with NAPI and a "queue-get" command which 
shows the NAPI_ID associated with the queue would suffice ?

Can we have both: "queue-get" (queue object with with NAPI-ID attr) and 
"napi-get" (NAPI object with "set of queue IDs" as an attribute), 
something like below (rx-queue is the queue object. rx-queues is the 
list attr within the NAPI object):

     name: rx-queue
     attributes:
       -
         name: qid
         doc: queue ID
         type: u32
       -
         name: ifindex
         doc: netdev ifindex
         type: u32
         checks:
           min: 1
       -
         name: napi-id
         doc: napi id
         type: u32

     name: napi
     attributes:
       -
         name: ifindex
         doc: netdev ifindex
         type: u32
         checks:
           min: 1
       -
         name: napi-id
         doc: napi id
         type: u32
       -
         name: rx-queues
         doc: list of rx queue ids associated with a napi
         type: u32
         multi-attr: true
       -
         name: tx-queues
         doc: list of tx queue ids associated with a napi
         type: u32
         multi-attr: true

Re: [net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Jakub Kicinski]

On Wed, 23 Aug 2023 17:46:20 -0700 Nambiar, Amritha wrote:
> Can we have both: "queue-get" (queue object with with NAPI-ID attr) and 
> "napi-get" (NAPI object with "set of queue IDs" as an attribute), 
> something like below (rx-queue is the queue object. rx-queues is the 
> list attr within the NAPI object):

I think just queue-get is better, the IDs of queues are not unique.
It's more of an index within a group than and identifier. 
Displaying information about e.g. XDP TX queues within would get messy.

Re: [net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Nambiar, Amritha]

On 8/23/2023 6:34 PM, Jakub Kicinski wrote:
> On Wed, 23 Aug 2023 17:46:20 -0700 Nambiar, Amritha wrote:
>> Can we have both: "queue-get" (queue object with with NAPI-ID attr) and
>> "napi-get" (NAPI object with "set of queue IDs" as an attribute),
>> something like below (rx-queue is the queue object. rx-queues is the
>> list attr within the NAPI object):
> 
> I think just queue-get is better, the IDs of queues are not unique.
> It's more of an index within a group than and identifier.
> Displaying information about e.g. XDP TX queues within would get messy.

Okay. So, I think we can support napi-get and queue-get commands as below:

--do napi-get --json='{"napi-id": 385}'
{'napi-id': 385, 'ifindex': 12, 'irq': 291, 'pid': 3614}

--do queue-get --json='{"q_index": 0, "q_type": RX}'
{'q_index': 0, 'q_type': RX, 'ifindex': 12, 'napi-id': 385}

As for queue-get, should we have a single queue object with a 'type' 
attribute for RX, TX, XDP etc. or should each of these queue types have 
their own distinct queue objects as they could have different attributes 
within.

Re: [net-next PATCH v2 3/9] netdev-genl: spec: Extend netdev netlink spec in YAML for NAPI

[Jakub Kicinski]

On Thu, 24 Aug 2023 15:26:37 -0700 Nambiar, Amritha wrote:
> --do queue-get --json='{"q_index": 0, "q_type": RX}'
> {'q_index': 0, 'q_type': RX, 'ifindex': 12, 'napi-id': 385}
> 
> As for queue-get, should we have a single queue object with a 'type' 
> attribute for RX, TX, XDP etc. or should each of these queue types have 
> their own distinct queue objects as they could have different attributes 
> within.

Separate objects, I think. 
The "key" for queues is a tuple of <type, id>.

e.g.

 <Rx, 0>
 <Tx, 0>
 <XDP_Tx, 0>

are 3 different objects (feel free to start with just rx and tx, 
we can add support for xdp queues later as needed).

[net-next PATCH v2 4/9] net: Move kernel helpers for queue index outside sysfs

[Amritha Nambiar]

The kernel helpers for retrieving tx/rx queue index
(get_netdev_queue_index and get_netdev_rx_queue_index)
are restricted to sysfs, move this out for more usability.
Also, replace BUG_ON with DEBUG_NET_WARN_ON_ONCE.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 include/linux/netdevice.h     |   12 ++++++++++++
 include/net/netdev_rx_queue.h |    4 +---
 net/core/net-sysfs.c          |   11 -----------
 3 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7645c0ba0995..4ec86d9aceb2 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2503,6 +2503,18 @@ struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
 	return &dev->_tx[index];
 }
 
+static inline
+unsigned int get_netdev_queue_index(struct netdev_queue *queue)
+{
+	struct net_device *dev = queue->dev;
+	unsigned int i;
+
+	i = queue - dev->_tx;
+	DEBUG_NET_WARN_ON_ONCE(i >= dev->num_tx_queues);
+
+	return i;
+}
+
 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
 						    const struct sk_buff *skb)
 {
diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
index 66bda0dfe71c..ac58fa7c2532 100644
--- a/include/net/netdev_rx_queue.h
+++ b/include/net/netdev_rx_queue.h
@@ -42,15 +42,13 @@ __netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
 	return dev->_rx + rxq;
 }
 
-#ifdef CONFIG_SYSFS
 static inline unsigned int
 get_netdev_rx_queue_index(struct netdev_rx_queue *queue)
 {
 	struct net_device *dev = queue->dev;
 	int index = queue - dev->_rx;
 
-	BUG_ON(index >= dev->num_rx_queues);
+	DEBUG_NET_WARN_ON_ONCE(index >= dev->num_rx_queues);
 	return index;
 }
 #endif
-#endif
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index fccaa5bac0ed..858d50503e4f 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1240,17 +1240,6 @@ static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
 	return sysfs_emit(buf, fmt_ulong, trans_timeout);
 }
 
-static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
-{
-	struct net_device *dev = queue->dev;
-	unsigned int i;
-
-	i = queue - dev->_tx;
-	BUG_ON(i >= dev->num_tx_queues);
-
-	return i;
-}
-
 static ssize_t traffic_class_show(struct netdev_queue *queue,
 				  char *buf)
 {

Re: [net-next PATCH v2 4/9] net: Move kernel helpers for queue index outside sysfs

[Jakub Kicinski]

On Mon, 21 Aug 2023 16:25:31 -0700 Amritha Nambiar wrote:
> +static inline
> +unsigned int get_netdev_queue_index(struct netdev_queue *queue)
> +{
> +	struct net_device *dev = queue->dev;
> +	unsigned int i;
> +
> +	i = queue - dev->_tx;
> +	DEBUG_NET_WARN_ON_ONCE(i >= dev->num_tx_queues);
> +
> +	return i;
> +}

If this is needed let's move it to a new header -
include/net/netdev_tx_queue.h ?

>  static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
>  						    const struct sk_buff *skb)
>  {
> diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
> index 66bda0dfe71c..ac58fa7c2532 100644
> --- a/include/net/netdev_rx_queue.h
> +++ b/include/net/netdev_rx_queue.h

Re: [net-next PATCH v2 4/9] net: Move kernel helpers for queue index outside sysfs

[Nambiar, Amritha]

On 8/22/2023 5:40 PM, Jakub Kicinski wrote:
> On Mon, 21 Aug 2023 16:25:31 -0700 Amritha Nambiar wrote:
>> +static inline
>> +unsigned int get_netdev_queue_index(struct netdev_queue *queue)
>> +{
>> +	struct net_device *dev = queue->dev;
>> +	unsigned int i;
>> +
>> +	i = queue - dev->_tx;
>> +	DEBUG_NET_WARN_ON_ONCE(i >= dev->num_tx_queues);
>> +
>> +	return i;
>> +}
> 
> If this is needed let's move it to a new header -
> include/net/netdev_tx_queue.h ?
> 

Okay, I'll submit a separate patch to move struct netdev_queue out of 
netdevice.h to a new header before this.

>>   static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
>>   						    const struct sk_buff *skb)
>>   {
>> diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
>> index 66bda0dfe71c..ac58fa7c2532 100644
>> --- a/include/net/netdev_rx_queue.h
>> +++ b/include/net/netdev_rx_queue.h

[net-next PATCH v2 5/9] netdev-genl: Add netlink framework functions for napi

[Amritha Nambiar]

Implement the netdev netlink framework functions for
napi support. The netdev structure tracks all the napi
instances and napi fields. The napi instances and associated
queue[s] can be retrieved this way.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 net/core/netdev-genl.c |  165 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 162 insertions(+), 3 deletions(-)

diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index b146679d6112..4bc6aa756001 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -5,9 +5,23 @@
 #include <linux/rtnetlink.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
+#include <net/netdev_rx_queue.h>
 
 #include "netdev-genl-gen.h"
 
+struct netdev_nl_dump_ctx {
+	unsigned long	ifindex;
+	int		napi_idx;
+};
+
+static inline struct netdev_nl_dump_ctx *
+netdev_dump_ctx(struct netlink_callback *cb)
+{
+	NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
+
+	return (struct netdev_nl_dump_ctx *)cb->ctx;
+}
+
 static int
 netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
 		   const struct genl_info *info)
@@ -101,12 +115,13 @@ int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
 
 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 {
+	struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
 	struct net *net = sock_net(skb->sk);
 	struct net_device *netdev;
 	int err = 0;
 
 	rtnl_lock();
-	for_each_netdev_dump(net, netdev, cb->args[0]) {
+	for_each_netdev_dump(net, netdev, ctx->ifindex) {
 		err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
 		if (err < 0)
 			break;
@@ -119,14 +134,158 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
+static int
+netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
+			const struct genl_info *info)
+{
+	struct netdev_rx_queue *rx_queue, *rxq;
+	struct netdev_queue *tx_queue, *txq;
+	unsigned int rx_qid, tx_qid;
+	void *hdr;
+
+	if (!napi->dev)
+		return -EINVAL;
+
+	hdr = genlmsg_iput(rsp, info);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (nla_put_u32(rsp, NETDEV_A_NAPI_NAPI_ID, napi->napi_id))
+		goto nla_put_failure;
+
+	if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
+		goto nla_put_failure;
+
+	list_for_each_entry_safe(rx_queue, rxq, &napi->napi_rxq_list, q_list) {
+		rx_qid = get_netdev_rx_queue_index(rx_queue);
+		if (nla_put_u32(rsp, NETDEV_A_NAPI_RX_QUEUES, rx_qid))
+			goto nla_put_failure;
+	}
+
+	list_for_each_entry_safe(tx_queue, txq, &napi->napi_txq_list, q_list) {
+		tx_qid = get_netdev_queue_index(tx_queue);
+		if (nla_put_u32(rsp, NETDEV_A_NAPI_TX_QUEUES, tx_qid))
+			goto nla_put_failure;
+	}
+
+	genlmsg_end(rsp, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(rsp, hdr);
+	return -EMSGSIZE;
+}
+
+static int
+netdev_nl_napi_fill(struct net_device *netdev, struct sk_buff *rsp,
+		    const struct genl_info *info, u32 napi_id)
+{
+	struct napi_struct *napi, *n;
+
+	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) {
+		if (napi->napi_id == napi_id)
+			return netdev_nl_napi_fill_one(rsp, napi, info);
+	}
+	return -EINVAL;
+}
+
 int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
 {
-	return -EOPNOTSUPP;
+	struct net_device *netdev;
+	struct sk_buff *rsp;
+	u32 napi_id;
+	int err;
+
+	if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_NAPI_ID))
+		return -EINVAL;
+
+	napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_NAPI_ID]);
+
+	rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!rsp)
+		return -ENOMEM;
+
+	rtnl_lock();
+
+	netdev = dev_get_by_napi_id(napi_id);
+	if (netdev)
+		err  = netdev_nl_napi_fill(netdev, rsp, info, napi_id);
+	else
+		err = -ENODEV;
+
+	rtnl_unlock();
+
+	if (err)
+		goto err_free_msg;
+
+	return genlmsg_reply(rsp, info);
+
+err_free_msg:
+	nlmsg_free(rsp);
+	return err;
+}
+
+static int
+netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
+			const struct genl_info *info, int *start)
+{
+	struct napi_struct *napi, *n;
+	int err = 0;
+	int i = 0;
+
+	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) {
+		if (i < *start) {
+			i++;
+			continue;
+		}
+		err = netdev_nl_napi_fill_one(rsp, napi, info);
+		if (err)
+			break;
+		*start = ++i;
+	}
+	return err;
 }
 
 int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	return -EOPNOTSUPP;
+	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
+	struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
+	struct net *net = sock_net(skb->sk);
+	struct net_device *netdev;
+	int n_idx = ctx->napi_idx;
+	u32 ifindex = 0;
+	int err = 0;
+
+	if (info->info.attrs[NETDEV_A_NAPI_IFINDEX])
+		ifindex = nla_get_u32(info->info.attrs[NETDEV_A_NAPI_IFINDEX]);
+
+	rtnl_lock();
+	if (ifindex) {
+		netdev = __dev_get_by_index(net, ifindex);
+		if (netdev)
+			err = netdev_nl_napi_dump_one(netdev, skb,
+						      genl_info_dump(cb),
+						      &n_idx);
+		else
+			err = -ENODEV;
+	} else {
+		for_each_netdev_dump(net, netdev, ctx->ifindex) {
+			err = netdev_nl_napi_dump_one(netdev, skb,
+						      genl_info_dump(cb),
+						      &n_idx);
+			if (!err)
+				n_idx = 0;
+			if (err < 0)
+				break;
+		}
+	}
+	rtnl_unlock();
+
+	if (err != -EMSGSIZE)
+		return err;
+
+	ctx->napi_idx = n_idx;
+	return skb->len;
 }
 
 static int netdev_genl_netdevice_event(struct notifier_block *nb,

Re: [net-next PATCH v2 5/9] netdev-genl: Add netlink framework functions for napi

[Jakub Kicinski]

On Mon, 21 Aug 2023 16:25:36 -0700 Amritha Nambiar wrote:
> Implement the netdev netlink framework functions for
> napi support. The netdev structure tracks all the napi
> instances and napi fields. The napi instances and associated
> queue[s] can be retrieved this way.
> 
> Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>

> @@ -119,14 +134,158 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
>  	return skb->len;
>  }
>  
> +static int
> +netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
> +			const struct genl_info *info)
> +{
> +	struct netdev_rx_queue *rx_queue, *rxq;
> +	struct netdev_queue *tx_queue, *txq;
> +	unsigned int rx_qid, tx_qid;
> +	void *hdr;
> +
> +	if (!napi->dev)
> +		return -EINVAL;

WARN_ON_ONCE()? If this can be assumed not to happen.

> +	hdr = genlmsg_iput(rsp, info);
> +	if (!hdr)
> +		return -EMSGSIZE;
> +
> +	if (nla_put_u32(rsp, NETDEV_A_NAPI_NAPI_ID, napi->napi_id))

napi_id can be zero.

> +		goto nla_put_failure;
> +
> +	if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
> +		goto nla_put_failure;

>  int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
>  {
> -	return -EOPNOTSUPP;
> +	struct net_device *netdev;
> +	struct sk_buff *rsp;
> +	u32 napi_id;
> +	int err;
> +
> +	if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_NAPI_ID))
> +		return -EINVAL;
> +
> +	napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_NAPI_ID]);
> +
> +	rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
> +	if (!rsp)
> +		return -ENOMEM;
> +
> +	rtnl_lock();
> +
> +	netdev = dev_get_by_napi_id(napi_id);

Why lookup the dev and not the NAPI?

> +	if (netdev)
> +		err  = netdev_nl_napi_fill(netdev, rsp, info, napi_id);
> +	else
> +		err = -ENODEV;
> +
> +	rtnl_unlock();
> +
> +	if (err)
> +		goto err_free_msg;
> +
> +	return genlmsg_reply(rsp, info);
> +
> +err_free_msg:
> +	nlmsg_free(rsp);
> +	return err;
> +}
> +
> +static int
> +netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
> +			const struct genl_info *info, int *start)
> +{
> +	struct napi_struct *napi, *n;
> +	int err = 0;
> +	int i = 0;
> +
> +	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) {

Why _safe()? I think you need _rcu() instead?

> +		if (i < *start) {
> +			i++;
> +			continue;
> +		}
> +		err = netdev_nl_napi_fill_one(rsp, napi, info);
> +		if (err)
> +			break;
> +		*start = ++i;

Why count them instead of relying on the IDs?

>  int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
>  {
> -	return -EOPNOTSUPP;
> +	const struct genl_dumpit_info *info = genl_dumpit_info(cb);

You can get genl_info_dump(cb) here, you don't use the genl_dumpit_info
AFAICT, only info->info.

Re: [net-next PATCH v2 5/9] netdev-genl: Add netlink framework functions for napi

[Nambiar, Amritha]

On 8/22/2023 5:51 PM, Jakub Kicinski wrote:
> On Mon, 21 Aug 2023 16:25:36 -0700 Amritha Nambiar wrote:
>> Implement the netdev netlink framework functions for
>> napi support. The netdev structure tracks all the napi
>> instances and napi fields. The napi instances and associated
>> queue[s] can be retrieved this way.
>>
>> Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
> 
>> @@ -119,14 +134,158 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
>>   	return skb->len;
>>   }
>>   
>> +static int
>> +netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
>> +			const struct genl_info *info)
>> +{
>> +	struct netdev_rx_queue *rx_queue, *rxq;
>> +	struct netdev_queue *tx_queue, *txq;
>> +	unsigned int rx_qid, tx_qid;
>> +	void *hdr;
>> +
>> +	if (!napi->dev)
>> +		return -EINVAL;
> 
> WARN_ON_ONCE()? If this can be assumed not to happen.

Okay. Will fix in v3.

> 
>> +	hdr = genlmsg_iput(rsp, info);
>> +	if (!hdr)
>> +		return -EMSGSIZE;
>> +
>> +	if (nla_put_u32(rsp, NETDEV_A_NAPI_NAPI_ID, napi->napi_id))
> 
> napi_id can be zero.

Will fix in v3.

> 
>> +		goto nla_put_failure;
>> +
>> +	if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
>> +		goto nla_put_failure;
> 
>>   int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
>>   {
>> -	return -EOPNOTSUPP;
>> +	struct net_device *netdev;
>> +	struct sk_buff *rsp;
>> +	u32 napi_id;
>> +	int err;
>> +
>> +	if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_NAPI_ID))
>> +		return -EINVAL;
>> +
>> +	napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_NAPI_ID]);
>> +
>> +	rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
>> +	if (!rsp)
>> +		return -ENOMEM;
>> +
>> +	rtnl_lock();
>> +
>> +	netdev = dev_get_by_napi_id(napi_id);
> 
> Why lookup the dev and not the NAPI?

Agree. Will fix in v3.

> 
>> +	if (netdev)
>> +		err  = netdev_nl_napi_fill(netdev, rsp, info, napi_id);
>> +	else
>> +		err = -ENODEV;
>> +
>> +	rtnl_unlock();
>> +
>> +	if (err)
>> +		goto err_free_msg;
>> +
>> +	return genlmsg_reply(rsp, info);
>> +
>> +err_free_msg:
>> +	nlmsg_free(rsp);
>> +	return err;
>> +}
>> +
>> +static int
>> +netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
>> +			const struct genl_info *info, int *start)
>> +{
>> +	struct napi_struct *napi, *n;
>> +	int err = 0;
>> +	int i = 0;
>> +
>> +	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) {
> 
> Why _safe()? I think you need _rcu() instead?

Agree. This is called within rtnl_lock. Will fix.

> 
>> +		if (i < *start) {
>> +			i++;
>> +			continue;
>> +		}
>> +		err = netdev_nl_napi_fill_one(rsp, napi, info);
>> +		if (err)
>> +			break;
>> +		*start = ++i;
> 
> Why count them instead of relying on the IDs?

Makes sense. Will fix.

> 
>>   int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
>>   {
>> -	return -EOPNOTSUPP;
>> +	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
> 
> You can get genl_info_dump(cb) here, you don't use the genl_dumpit_info
> AFAICT, only info->info.

Will fix in v3.

[net-next PATCH v2 6/9] netdev-genl: spec: Add irq in netdev netlink YAML spec

[Amritha Nambiar]

Add support in netlink spec(netdev.yaml) for interrupt number
among the NAPI attributes. Add code generated from the spec.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 Documentation/netlink/specs/netdev.yaml |    5 +++++
 include/uapi/linux/netdev.h             |    1 +
 tools/include/uapi/linux/netdev.h       |    1 +
 tools/net/ynl/generated/netdev-user.c   |    6 ++++++
 tools/net/ynl/generated/netdev-user.h   |    2 ++
 5 files changed, 15 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index a068cf3b5a7e..aef40397b026 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -91,6 +91,10 @@ attribute-sets:
         doc: list of tx queues associated with a napi
         type: u32
         multi-attr: true
+      -
+        name: irq
+        doc: The associated interrupt vector number for the napi
+        type: u32
 
 operations:
   list:
@@ -138,6 +142,7 @@ operations:
             - ifindex
             - rx-queues
             - tx-queues
+            - irq
       dump:
         request:
           attributes:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 28f6bad7c48e..d31241e155b9 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -53,6 +53,7 @@ enum {
 	NETDEV_A_NAPI_NAPI_ID,
 	NETDEV_A_NAPI_RX_QUEUES,
 	NETDEV_A_NAPI_TX_QUEUES,
+	NETDEV_A_NAPI_IRQ,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 28f6bad7c48e..d31241e155b9 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -53,6 +53,7 @@ enum {
 	NETDEV_A_NAPI_NAPI_ID,
 	NETDEV_A_NAPI_RX_QUEUES,
 	NETDEV_A_NAPI_TX_QUEUES,
+	NETDEV_A_NAPI_IRQ,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c
index 0cc8c0151b36..a59377c70503 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -64,6 +64,7 @@ struct ynl_policy_attr netdev_napi_policy[NETDEV_A_NAPI_MAX + 1] = {
 	[NETDEV_A_NAPI_NAPI_ID] = { .name = "napi-id", .type = YNL_PT_U32, },
 	[NETDEV_A_NAPI_RX_QUEUES] = { .name = "rx-queues", .type = YNL_PT_U32, },
 	[NETDEV_A_NAPI_TX_QUEUES] = { .name = "tx-queues", .type = YNL_PT_U32, },
+	[NETDEV_A_NAPI_IRQ] = { .name = "irq", .type = YNL_PT_U32, },
 };
 
 struct ynl_policy_nest netdev_napi_nest = {
@@ -238,6 +239,11 @@ int netdev_napi_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
 			n_rx_queues++;
 		} else if (type == NETDEV_A_NAPI_TX_QUEUES) {
 			n_tx_queues++;
+		} else if (type == NETDEV_A_NAPI_IRQ) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.irq = 1;
+			dst->irq = mnl_attr_get_u32(attr);
 		}
 	}
 
diff --git a/tools/net/ynl/generated/netdev-user.h b/tools/net/ynl/generated/netdev-user.h
index 742cb37b6844..9edc5828ca89 100644
--- a/tools/net/ynl/generated/netdev-user.h
+++ b/tools/net/ynl/generated/netdev-user.h
@@ -111,6 +111,7 @@ struct netdev_napi_get_rsp {
 	struct {
 		__u32 napi_id:1;
 		__u32 ifindex:1;
+		__u32 irq:1;
 	} _present;
 
 	__u32 napi_id;
@@ -119,6 +120,7 @@ struct netdev_napi_get_rsp {
 	__u32 *rx_queues;
 	unsigned int n_tx_queues;
 	__u32 *tx_queues;
+	__u32 irq;
 };
 
 void netdev_napi_get_rsp_free(struct netdev_napi_get_rsp *rsp);

[net-next PATCH v2 7/9] net: Add NAPI IRQ support

[Amritha Nambiar]

Add support to associate the interrupt vector number for a
NAPI instance.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_lib.c |    3 +++
 include/linux/netdevice.h                |    6 ++++++
 net/core/dev.c                           |    1 +
 net/core/netdev-genl.c                   |    4 ++++
 4 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index c2b9a25db139..6c86e6ac9dfe 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -2972,6 +2972,9 @@ int ice_q_vector_add_napi_queues(struct ice_q_vector *q_vector)
 			return ret;
 	}
 
+	/* Also set the interrupt number for the NAPI */
+	napi_set_irq(&q_vector->napi, q_vector->irq.virq);
+
 	return ret;
 }
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4ec86d9aceb2..60f06bac6d24 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -390,6 +390,7 @@ struct napi_struct {
 	struct hlist_node	napi_hash_node;
 	struct list_head	napi_rxq_list;
 	struct list_head	napi_txq_list;
+	int			irq;
 };
 
 enum {
@@ -2634,6 +2635,11 @@ static inline void *netdev_priv(const struct net_device *dev)
  */
 #define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))
 
+static inline void napi_set_irq(struct napi_struct *napi, int irq)
+{
+	napi->irq = irq;
+}
+
 int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
 			 enum q_type type);
 
diff --git a/net/core/dev.c b/net/core/dev.c
index ec4c469c9e1d..10d1f0a07ba2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6465,6 +6465,7 @@ void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
 
 	INIT_LIST_HEAD(&napi->napi_rxq_list);
 	INIT_LIST_HEAD(&napi->napi_txq_list);
+	napi->irq = -1;
 }
 EXPORT_SYMBOL(netif_napi_add_weight);
 
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 4bc6aa756001..63b8690d8ba3 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -168,7 +168,11 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 			goto nla_put_failure;
 	}
 
+	if (napi->irq >= 0 && (nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq)))
+		goto nla_put_failure;
+
 	genlmsg_end(rsp, hdr);
+
 	return 0;
 
 nla_put_failure:

Re: [net-next PATCH v2 7/9] net: Add NAPI IRQ support

[Jakub Kicinski]

On Mon, 21 Aug 2023 16:25:46 -0700 Amritha Nambiar wrote:
> +	if (napi->irq >= 0 && (nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq)))

Unnecessary brackets around nla_put

Re: [net-next PATCH v2 7/9] net: Add NAPI IRQ support

[Nambiar, Amritha]

On 8/22/2023 5:52 PM, Jakub Kicinski wrote:
> On Mon, 21 Aug 2023 16:25:46 -0700 Amritha Nambiar wrote:
>> +	if (napi->irq >= 0 && (nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq)))
> 
> Unnecessary brackets around nla_put

Will fix in v3.

[net-next PATCH v2 8/9] netdev-genl: spec: Add PID in netdev netlink YAML spec

[Amritha Nambiar]

Add support in netlink spec(netdev.yaml) for PID of the
NAPI thread. Add code generated from the spec.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 Documentation/netlink/specs/netdev.yaml |    5 +++++
 include/uapi/linux/netdev.h             |    1 +
 tools/include/uapi/linux/netdev.h       |    1 +
 tools/net/ynl/generated/netdev-user.c   |    6 ++++++
 tools/net/ynl/generated/netdev-user.h   |    2 ++
 5 files changed, 15 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index aef40397b026..3472f086d523 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -95,6 +95,10 @@ attribute-sets:
         name: irq
         doc: The associated interrupt vector number for the napi
         type: u32
+      -
+        name: pid
+        doc: PID of the napi thread
+        type: s32
 
 operations:
   list:
@@ -143,6 +147,7 @@ operations:
             - rx-queues
             - tx-queues
             - irq
+            - pid
       dump:
         request:
           attributes:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index d31241e155b9..b87ec27b2741 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -54,6 +54,7 @@ enum {
 	NETDEV_A_NAPI_RX_QUEUES,
 	NETDEV_A_NAPI_TX_QUEUES,
 	NETDEV_A_NAPI_IRQ,
+	NETDEV_A_NAPI_PID,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index d31241e155b9..b87ec27b2741 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -54,6 +54,7 @@ enum {
 	NETDEV_A_NAPI_RX_QUEUES,
 	NETDEV_A_NAPI_TX_QUEUES,
 	NETDEV_A_NAPI_IRQ,
+	NETDEV_A_NAPI_PID,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c
index a59377c70503..53a52055453d 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -65,6 +65,7 @@ struct ynl_policy_attr netdev_napi_policy[NETDEV_A_NAPI_MAX + 1] = {
 	[NETDEV_A_NAPI_RX_QUEUES] = { .name = "rx-queues", .type = YNL_PT_U32, },
 	[NETDEV_A_NAPI_TX_QUEUES] = { .name = "tx-queues", .type = YNL_PT_U32, },
 	[NETDEV_A_NAPI_IRQ] = { .name = "irq", .type = YNL_PT_U32, },
+	[NETDEV_A_NAPI_PID] = { .name = "pid", .type = YNL_PT_U32, },
 };
 
 struct ynl_policy_nest netdev_napi_nest = {
@@ -244,6 +245,11 @@ int netdev_napi_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
 				return MNL_CB_ERROR;
 			dst->_present.irq = 1;
 			dst->irq = mnl_attr_get_u32(attr);
+		} else if (type == NETDEV_A_NAPI_PID) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.pid = 1;
+			dst->pid = mnl_attr_get_u32(attr);
 		}
 	}
 
diff --git a/tools/net/ynl/generated/netdev-user.h b/tools/net/ynl/generated/netdev-user.h
index 9edc5828ca89..b3bbcdd5b669 100644
--- a/tools/net/ynl/generated/netdev-user.h
+++ b/tools/net/ynl/generated/netdev-user.h
@@ -112,6 +112,7 @@ struct netdev_napi_get_rsp {
 		__u32 napi_id:1;
 		__u32 ifindex:1;
 		__u32 irq:1;
+		__u32 pid:1;
 	} _present;
 
 	__u32 napi_id;
@@ -121,6 +122,7 @@ struct netdev_napi_get_rsp {
 	unsigned int n_tx_queues;
 	__u32 *tx_queues;
 	__u32 irq;
+	__s32 pid;
 };
 
 void netdev_napi_get_rsp_free(struct netdev_napi_get_rsp *rsp);

[net-next PATCH v2 9/9] netdev-genl: Add PID for the NAPI thread

[Amritha Nambiar]

In the threaded NAPI mode, expose the PID of the NAPI thread.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
---
 net/core/netdev-genl.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 63b8690d8ba3..47be577782e4 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -141,6 +141,7 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 	struct netdev_rx_queue *rx_queue, *rxq;
 	struct netdev_queue *tx_queue, *txq;
 	unsigned int rx_qid, tx_qid;
+	pid_t pid;
 	void *hdr;
 
 	if (!napi->dev)
@@ -171,6 +172,12 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 	if (napi->irq >= 0 && (nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq)))
 		goto nla_put_failure;
 
+	if (napi->thread) {
+		pid = task_pid_nr(napi->thread);
+		if (nla_put_s32(rsp, NETDEV_A_NAPI_PID, pid))
+			goto nla_put_failure;
+	}
+
 	genlmsg_end(rsp, hdr);
 
 	return 0;

RE: [net-next PATCH v2 0/9] Introduce NAPI queues support

[David Laight]

From: Amritha Nambiar
> Sent: Tuesday, August 22, 2023 12:25 AM
> 
> Introduce support for associating NAPI instances with
> corresponding RX and TX queue set. Add the capability
> to export NAPI information supported by the device.
> Extend the netdev_genl generic netlink family for netdev
> with NAPI data. The NAPI fields exposed are:
> - NAPI id
> - NAPI device ifindex
> - queue/queue-set (both RX and TX) associated with each
>   NAPI instance
> - Interrupt number associated with the NAPI instance
> - PID for the NAPI thread
> 
> This series only supports 'get' ability for retrieving
> certain NAPI attributes. The 'set' ability for setting
> queue[s] associated with a NAPI instance via netdev-genl
> will be submitted as a separate patch series.
> 
> Previous discussion at:
> https://lore.kernel.org/netdev/c8476530638a5f4381d64db0e024ed49c2db3b02.camel@gmail.com/T/#m00999652a8
> b4731fbdb7bf698d2e3666c65a60e7

Not of this answers: what is it for?

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

Re: [net-next PATCH v2 0/9] Introduce NAPI queues support

[Nambiar, Amritha]

On 8/23/2023 3:24 AM, David Laight wrote:
> From: Amritha Nambiar
>> Sent: Tuesday, August 22, 2023 12:25 AM
>>
>> Introduce support for associating NAPI instances with
>> corresponding RX and TX queue set. Add the capability
>> to export NAPI information supported by the device.
>> Extend the netdev_genl generic netlink family for netdev
>> with NAPI data. The NAPI fields exposed are:
>> - NAPI id
>> - NAPI device ifindex
>> - queue/queue-set (both RX and TX) associated with each
>>    NAPI instance
>> - Interrupt number associated with the NAPI instance
>> - PID for the NAPI thread
>>
>> This series only supports 'get' ability for retrieving
>> certain NAPI attributes. The 'set' ability for setting
>> queue[s] associated with a NAPI instance via netdev-genl
>> will be submitted as a separate patch series.
>>
>> Previous discussion at:
>> https://lore.kernel.org/netdev/c8476530638a5f4381d64db0e024ed49c2db3b02.camel@gmail.com/T/#m00999652a8
>> b4731fbdb7bf698d2e3666c65a60e7
> 
> Not of this answers: what is it for?

The use-case is to limit the number of napi instances for the queues
within a queue-group. Other discussions at 
https://lore.kernel.org/netdev/20230524111259.1323415-2-bigeasy@linutronix.de/ 
also explains the need.

> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)