linux/net/core/netdev-genl-gen.c
Mina Almasry 170aafe35c netdev: support binding dma-buf to netdevice
Add a netdev_dmabuf_binding struct which represents the
dma-buf-to-netdevice binding. The netlink API will bind the dma-buf to
rx queues on the netdevice. On the binding, the dma_buf_attach
& dma_buf_map_attachment will occur. The entries in the sg_table from
mapping will be inserted into a genpool to make it ready
for allocation.

The chunks in the genpool are owned by a dmabuf_chunk_owner struct which
holds the dma-buf offset of the base of the chunk and the dma_addr of
the chunk. Both are needed to use allocations that come from this chunk.

We create a new type that represents an allocation from the genpool:
net_iov. We setup the net_iov allocation size in the
genpool to PAGE_SIZE for simplicity: to match the PAGE_SIZE normally
allocated by the page pool and given to the drivers.

The user can unbind the dmabuf from the netdevice by closing the netlink
socket that established the binding. We do this so that the binding is
automatically unbound even if the userspace process crashes.

The binding and unbinding leaves an indicator in struct netdev_rx_queue
that the given queue is bound, and the binding is actuated by resetting
the rx queue using the queue API.

The netdev_dmabuf_binding struct is refcounted, and releases its
resources only when all the refs are released.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Kaiyuan Zhang <kaiyuanz@google.com>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> # excluding netlink
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240910171458.219195-4-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-09-11 20:44:31 -07:00

195 lines
6.0 KiB
C

// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
/* Do not edit directly, auto-generated from: */
/* Documentation/netlink/specs/netdev.yaml */
/* YNL-GEN kernel source */
#include <net/netlink.h>
#include <net/genetlink.h>
#include "netdev-genl-gen.h"
#include <uapi/linux/netdev.h>
#include <linux/list.h>
/* Integer value ranges */
static const struct netlink_range_validation netdev_a_page_pool_id_range = {
.min = 1ULL,
.max = 4294967295ULL,
};
static const struct netlink_range_validation netdev_a_page_pool_ifindex_range = {
.min = 1ULL,
.max = 2147483647ULL,
};
/* Common nested types */
const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFINDEX + 1] = {
[NETDEV_A_PAGE_POOL_ID] = NLA_POLICY_FULL_RANGE(NLA_UINT, &netdev_a_page_pool_id_range),
[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),
};
/* NETDEV_CMD_PAGE_POOL_GET - do */
#ifdef CONFIG_PAGE_POOL
static const struct nla_policy netdev_page_pool_get_nl_policy[NETDEV_A_PAGE_POOL_ID + 1] = {
[NETDEV_A_PAGE_POOL_ID] = NLA_POLICY_FULL_RANGE(NLA_UINT, &netdev_a_page_pool_id_range),
};
#endif /* CONFIG_PAGE_POOL */
/* NETDEV_CMD_PAGE_POOL_STATS_GET - do */
#ifdef CONFIG_PAGE_POOL_STATS
static const struct nla_policy netdev_page_pool_stats_get_nl_policy[NETDEV_A_PAGE_POOL_STATS_INFO + 1] = {
[NETDEV_A_PAGE_POOL_STATS_INFO] = NLA_POLICY_NESTED(netdev_page_pool_info_nl_policy),
};
#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),
};
/* NETDEV_CMD_NAPI_GET - do */
static const struct nla_policy netdev_napi_get_do_nl_policy[NETDEV_A_NAPI_ID + 1] = {
[NETDEV_A_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),
};
/* NETDEV_CMD_QSTATS_GET - dump */
static const struct nla_policy netdev_qstats_get_nl_policy[NETDEV_A_QSTATS_SCOPE + 1] = {
[NETDEV_A_QSTATS_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
[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[] = {
{
.cmd = NETDEV_CMD_DEV_GET,
.doit = netdev_nl_dev_get_doit,
.policy = netdev_dev_get_nl_policy,
.maxattr = NETDEV_A_DEV_IFINDEX,
.flags = GENL_CMD_CAP_DO,
},
{
.cmd = NETDEV_CMD_DEV_GET,
.dumpit = netdev_nl_dev_get_dumpit,
.flags = GENL_CMD_CAP_DUMP,
},
#ifdef CONFIG_PAGE_POOL
{
.cmd = NETDEV_CMD_PAGE_POOL_GET,
.doit = netdev_nl_page_pool_get_doit,
.policy = netdev_page_pool_get_nl_policy,
.maxattr = NETDEV_A_PAGE_POOL_ID,
.flags = GENL_CMD_CAP_DO,
},
{
.cmd = NETDEV_CMD_PAGE_POOL_GET,
.dumpit = netdev_nl_page_pool_get_dumpit,
.flags = GENL_CMD_CAP_DUMP,
},
#endif /* CONFIG_PAGE_POOL */
#ifdef CONFIG_PAGE_POOL_STATS
{
.cmd = NETDEV_CMD_PAGE_POOL_STATS_GET,
.doit = netdev_nl_page_pool_stats_get_doit,
.policy = netdev_page_pool_stats_get_nl_policy,
.maxattr = NETDEV_A_PAGE_POOL_STATS_INFO,
.flags = GENL_CMD_CAP_DO,
},
{
.cmd = NETDEV_CMD_PAGE_POOL_STATS_GET,
.dumpit = netdev_nl_page_pool_stats_get_dumpit,
.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,
},
{
.cmd = NETDEV_CMD_NAPI_GET,
.doit = netdev_nl_napi_get_doit,
.policy = netdev_napi_get_do_nl_policy,
.maxattr = NETDEV_A_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,
},
{
.cmd = NETDEV_CMD_QSTATS_GET,
.dumpit = netdev_nl_qstats_get_dumpit,
.policy = netdev_qstats_get_nl_policy,
.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[] = {
[NETDEV_NLGRP_MGMT] = { "mgmt", },
[NETDEV_NLGRP_PAGE_POOL] = { "page-pool", },
};
struct genl_family netdev_nl_family __ro_after_init = {
.name = NETDEV_FAMILY_NAME,
.version = NETDEV_FAMILY_VERSION,
.netnsok = true,
.parallel_ops = true,
.module = THIS_MODULE,
.split_ops = netdev_nl_ops,
.n_split_ops = ARRAY_SIZE(netdev_nl_ops),
.mcgrps = netdev_nl_mcgrps,
.n_mcgrps = ARRAY_SIZE(netdev_nl_mcgrps),
.sock_priv_size = sizeof(struct list_head),
.sock_priv_init = (void *)netdev_nl_sock_priv_init,
.sock_priv_destroy = (void *)netdev_nl_sock_priv_destroy,
};