diff mbox series

[RFC,net-next,v2,4/6] net: devmem: TCP tx netlink api

Message ID 20250130211539.428952-5-almasrymina@google.com (mailing list archive)
State New
Headers show
Series Device memory TCP TX | expand

Commit Message

Mina Almasry Jan. 30, 2025, 9:15 p.m. UTC 
From: Stanislav Fomichev <sdf@fomichev.me>

Add bind-tx netlink call to attach dmabuf for TX; queue is not
required, only ifindex and dmabuf fd for attachment.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Mina Almasry <almasrymina@google.com>

---
 Documentation/netlink/specs/netdev.yaml | 12 ++++++++++++
 include/uapi/linux/netdev.h             |  1 +
 net/core/netdev-genl-gen.c              | 13 +++++++++++++
 net/core/netdev-genl-gen.h              |  1 +
 net/core/netdev-genl.c                  |  6 ++++++
 tools/include/uapi/linux/netdev.h       |  1 +
 6 files changed, 34 insertions(+)

Comments

Simon Horman Jan. 31, 2025, 8:29 a.m. UTC | #1 
On Thu, Jan 30, 2025 at 09:15:37PM +0000, Mina Almasry wrote:
> From: Stanislav Fomichev <sdf@fomichev.me>
> 
> Add bind-tx netlink call to attach dmabuf for TX; queue is not
> required, only ifindex and dmabuf fd for attachment.
> 
> Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
> Signed-off-by: Mina Almasry <almasrymina@google.com>

Hi Mina,

I noticed minor issue relating to generated code.

...

> diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
> index cbb544bd6c84..93f4333e7bc6 100644
> --- a/Documentation/netlink/specs/netdev.yaml
> +++ b/Documentation/netlink/specs/netdev.yaml

The lines preceding the hunk below are:

      name: napi-set
      doc: Set configurable NAPI instance settings.
      attribute-set: napi
      flags: [ admin-perm ]
      do:
        request:
          attributes:
            - id

> @@ -711,6 +711,18 @@ operations:
>              - defer-hard-irqs
>              - gro-flush-timeout
>              - irq-suspend-timeout
> +    -
> +      name: bind-tx
> +      doc: Bind dmabuf to netdev for TX
> +      attribute-set: dmabuf

Unlike the entry for napi-set there is no "flags: [ admin-perm ]" fpr
bind-tx...

> +      do:
> +        request:
> +          attributes:
> +            - ifindex
> +            - fd
> +        reply:
> +          attributes:
> +            - id
>  
>  kernel-family:
>    headers: [ "linux/list.h"]

...

> diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c

...

> @@ -190,6 +196,13 @@ static const struct genl_split_ops netdev_nl_ops[] = {

The lines preceding this hunk are:

	{
		.cmd		= NETDEV_CMD_NAPI_SET,
		.doit		= netdev_nl_napi_set_doit,
		.policy		= netdev_napi_set_nl_policy,

>  		.maxattr	= NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT,
>  		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
>  	},
> +	{
> +		.cmd		= NETDEV_CMD_BIND_TX,
> +		.doit		= netdev_nl_bind_tx_doit,
> +		.policy		= netdev_bind_tx_nl_policy,
> +		.maxattr	= NETDEV_A_DMABUF_FD,
> +		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,

... so I don't think GENL_ADMIN_PERM should be here.

Flagged by running tools/net/ynl/ynl-regen.sh -f && git diff

> +	},
>  };
>  
>  static const struct genl_multicast_group netdev_nl_mcgrps[] = {

...
diff mbox series

Patch

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index cbb544bd6c84..93f4333e7bc6 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -711,6 +711,18 @@  operations:
             - defer-hard-irqs
             - gro-flush-timeout
             - irq-suspend-timeout
+    -
+      name: bind-tx
+      doc: Bind dmabuf to netdev for TX
+      attribute-set: dmabuf
+      do:
+        request:
+          attributes:
+            - ifindex
+            - fd
+        reply:
+          attributes:
+            - id
 
 kernel-family:
   headers: [ "linux/list.h"]
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index e4be227d3ad6..04364ef5edbe 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -203,6 +203,7 @@  enum {
 	NETDEV_CMD_QSTATS_GET,
 	NETDEV_CMD_BIND_RX,
 	NETDEV_CMD_NAPI_SET,
+	NETDEV_CMD_BIND_TX,
 
 	__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 996ac6a449eb..9e947284e42d 100644
--- a/net/core/netdev-genl-gen.c
+++ b/net/core/netdev-genl-gen.c
@@ -99,6 +99,12 @@  static const struct nla_policy netdev_napi_set_nl_policy[NETDEV_A_NAPI_IRQ_SUSPE
 	[NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT] = { .type = NLA_UINT, },
 };
 
+/* NETDEV_CMD_BIND_TX - do */
+static const struct nla_policy netdev_bind_tx_nl_policy[NETDEV_A_DMABUF_FD + 1] = {
+	[NETDEV_A_DMABUF_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+	[NETDEV_A_DMABUF_FD] = { .type = NLA_U32, },
+};
+
 /* Ops table for netdev */
 static const struct genl_split_ops netdev_nl_ops[] = {
 	{
@@ -190,6 +196,13 @@  static const struct genl_split_ops netdev_nl_ops[] = {
 		.maxattr	= NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT,
 		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
+	{
+		.cmd		= NETDEV_CMD_BIND_TX,
+		.doit		= netdev_nl_bind_tx_doit,
+		.policy		= netdev_bind_tx_nl_policy,
+		.maxattr	= NETDEV_A_DMABUF_FD,
+		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+	},
 };
 
 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 e09dd7539ff2..c1fed66e92b9 100644
--- a/net/core/netdev-genl-gen.h
+++ b/net/core/netdev-genl-gen.h
@@ -34,6 +34,7 @@  int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
 				struct netlink_callback *cb);
 int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info);
 int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info);
+int netdev_nl_bind_tx_doit(struct sk_buff *skb, struct genl_info *info);
 
 enum {
 	NETDEV_NLGRP_MGMT,
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 715f85c6b62e..0e41699df419 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -911,6 +911,12 @@  int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+/* stub */
+int netdev_nl_bind_tx_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	return 0;
+}
+
 void netdev_nl_sock_priv_init(struct list_head *priv)
 {
 	INIT_LIST_HEAD(priv);
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index e4be227d3ad6..04364ef5edbe 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -203,6 +203,7 @@  enum {
 	NETDEV_CMD_QSTATS_GET,
 	NETDEV_CMD_BIND_RX,
 	NETDEV_CMD_NAPI_SET,
+	NETDEV_CMD_BIND_TX,
 
 	__NETDEV_CMD_MAX,
 	NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)