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net: netdev netlink api to bind dma-buf to a net device

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API takes the dma-buf fd as input, and binds it to the netdevice. The
user can specify the rx queues to bind the dma-buf to.

Suggested-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240910171458.219195-3-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Mina Almasry 2024-09-10 17:14:46 +00:00 committed by Jakub Kicinski
parent 7c88f86576
commit 3efd7ab46d
6 changed files with 96 additions and 0 deletions
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47
Documentation/netlink/specs/netdev.yaml
View File

@ -457,6 +457,39 @@ attribute-sets:
Number of times driver re-started accepting send
requests to this queue from the stack.
type: uint
-
name: queue-id
subset-of: queue
attributes:
-
name: id
-
name: type
-
name: dmabuf
attributes:
-
name: ifindex
doc: netdev ifindex to bind the dmabuf to.
type: u32
checks:
min: 1
-
name: queues
doc: receive queues to bind the dmabuf to.
type: nest
nested-attributes: queue-id
multi-attr: true
-
name: fd
doc: dmabuf file descriptor to bind.
type: u32
-
name: id
doc: id of the dmabuf binding
type: u32
checks:
min: 1
operations:
list:
@ -619,6 +652,20 @@ operations:
- rx-bytes
- tx-packets
- tx-bytes
-
name: bind-rx
doc: Bind dmabuf to netdev
attribute-set: dmabuf
flags: [ admin-perm ]
do:
request:
attributes:
- ifindex
- fd
- queues
reply:
attributes:
- id
mcast-groups:
list:

11
include/uapi/linux/netdev.h
View File

@ -173,6 +173,16 @@ enum {
NETDEV_A_QSTATS_MAX = (__NETDEV_A_QSTATS_MAX - 1)
};
enum {
NETDEV_A_DMABUF_IFINDEX = 1,
NETDEV_A_DMABUF_QUEUES,
NETDEV_A_DMABUF_FD,
NETDEV_A_DMABUF_ID,
__NETDEV_A_DMABUF_MAX,
NETDEV_A_DMABUF_MAX = (__NETDEV_A_DMABUF_MAX - 1)
};
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@ -186,6 +196,7 @@ enum {
NETDEV_CMD_QUEUE_GET,
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
NETDEV_CMD_BIND_RX,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)

19
net/core/netdev-genl-gen.c
View File

@ -27,6 +27,11 @@ const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFIND
[NETDEV_A_PAGE_POOL_IFINDEX] = NLA_POLICY_FULL_RANGE(NLA_U32, &netdev_a_page_pool_ifindex_range),
};
const struct nla_policy netdev_queue_id_nl_policy[NETDEV_A_QUEUE_TYPE + 1] = {
[NETDEV_A_QUEUE_ID] = { .type = NLA_U32, },
[NETDEV_A_QUEUE_TYPE] = NLA_POLICY_MAX(NLA_U32, 1),
};
/* NETDEV_CMD_DEV_GET - do */
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),
@ -74,6 +79,13 @@ static const struct nla_policy netdev_qstats_get_nl_policy[NETDEV_A_QSTATS_SCOPE
[NETDEV_A_QSTATS_SCOPE] = NLA_POLICY_MASK(NLA_UINT, 0x1),
};
/* NETDEV_CMD_BIND_RX - do */
static const struct nla_policy netdev_bind_rx_nl_policy[NETDEV_A_DMABUF_FD + 1] = {
[NETDEV_A_DMABUF_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
[NETDEV_A_DMABUF_FD] = { .type = NLA_U32, },
[NETDEV_A_DMABUF_QUEUES] = NLA_POLICY_NESTED(netdev_queue_id_nl_policy),
};
/* Ops table for netdev */
static const struct genl_split_ops netdev_nl_ops[] = {
{
@ -151,6 +163,13 @@ static const struct genl_split_ops netdev_nl_ops[] = {
.maxattr = NETDEV_A_QSTATS_SCOPE,
.flags = GENL_CMD_CAP_DUMP,
},
{
.cmd = NETDEV_CMD_BIND_RX,
.doit = netdev_nl_bind_rx_doit,
.policy = netdev_bind_rx_nl_policy,
.maxattr = NETDEV_A_DMABUF_FD,
.flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
},
};
static const struct genl_multicast_group netdev_nl_mcgrps[] = {

2
net/core/netdev-genl-gen.h
View File

@ -13,6 +13,7 @@
/* Common nested types */
extern const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFINDEX + 1];
extern const struct nla_policy netdev_queue_id_nl_policy[NETDEV_A_QUEUE_TYPE + 1];
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);
@ -30,6 +31,7 @@ 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);
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);
enum {
NETDEV_NLGRP_MGMT,

6
net/core/netdev-genl.c
View File

@ -723,6 +723,12 @@ int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
return err;
}
/* Stub */
int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
{
return 0;
}
static int netdev_genl_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{

11
tools/include/uapi/linux/netdev.h
View File

@ -173,6 +173,16 @@ enum {
NETDEV_A_QSTATS_MAX = (__NETDEV_A_QSTATS_MAX - 1)
};
enum {
NETDEV_A_DMABUF_IFINDEX = 1,
NETDEV_A_DMABUF_QUEUES,
NETDEV_A_DMABUF_FD,
NETDEV_A_DMABUF_ID,
__NETDEV_A_DMABUF_MAX,
NETDEV_A_DMABUF_MAX = (__NETDEV_A_DMABUF_MAX - 1)
};
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@ -186,6 +196,7 @@ enum {
NETDEV_CMD_QUEUE_GET,
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
NETDEV_CMD_BIND_RX,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)