Commit 8802087d authored by Stanislav Fomichev's avatar Stanislav Fomichev Committed by Paolo Abeni
Browse files

net: devmem: TCP tx netlink api 



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

Signed-off-by: default avatarStanislav Fomichev <sdf@fomichev.me>
Signed-off-by: default avatarMina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20250508004830.4100853-4-almasrymina@google.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent e9f3d61d

Documentation/netlink/specs/netdev.yaml

+12 −0
Original line number Diff line number Diff line
@@ -743,6 +743,18 @@ 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: [ "net/netdev_netlink.h"]

include/uapi/linux/netdev.h

+1 −0
Original line number Diff line number Diff line
@@ -219,6 +219,7 @@ 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)

net/core/netdev-genl-gen.c

+13 −0
Original line number Diff line number Diff line
@@ -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_CMD_CAP_DO,

	},

};



static const struct genl_multicast_group netdev_nl_mcgrps[] = {

net/core/netdev-genl-gen.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

net/core/netdev-genl.c

+6 −0
Original line number Diff line number Diff line
@@ -968,6 +968,12 @@ 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 netdev_nl_sock *priv)

{

	INIT_LIST_HEAD(&priv->bindings);