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net: page_pool: add netlink notifications for state changes

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Generate netlink notifications about page pool state changes.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2023-11-26 15:07:35 -08:00 committed by Paolo Abeni
parent 950ab53b77
commit d2ef6aa077
5 changed files with 62 additions and 0 deletions
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20
Documentation/netlink/specs/netdev.yaml
View File

@ -166,8 +166,28 @@ operations:
dump:
reply: *pp-reply
config-cond: page-pool
-
name: page-pool-add-ntf
doc: Notification about page pool appearing.
notify: page-pool-get
mcgrp: page-pool
config-cond: page-pool
-
name: page-pool-del-ntf
doc: Notification about page pool disappearing.
notify: page-pool-get
mcgrp: page-pool
config-cond: page-pool
-
name: page-pool-change-ntf
doc: Notification about page pool configuration being changed.
notify: page-pool-get
mcgrp: page-pool
config-cond: page-pool
mcast-groups:
list:
-
name: mgmt
-
name: page-pool

4
include/uapi/linux/netdev.h
View File

@ -79,11 +79,15 @@ enum {
NETDEV_CMD_DEV_DEL_NTF,
NETDEV_CMD_DEV_CHANGE_NTF,
NETDEV_CMD_PAGE_POOL_GET,
NETDEV_CMD_PAGE_POOL_ADD_NTF,
NETDEV_CMD_PAGE_POOL_DEL_NTF,
NETDEV_CMD_PAGE_POOL_CHANGE_NTF,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)
};
#define NETDEV_MCGRP_MGMT "mgmt"
#define NETDEV_MCGRP_PAGE_POOL "page-pool"
#endif /* _UAPI_LINUX_NETDEV_H */

1
net/core/netdev-genl-gen.c
View File

@ -60,6 +60,7 @@ static const struct genl_split_ops netdev_nl_ops[] = {
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 = {

1
net/core/netdev-genl-gen.h
View File

@ -19,6 +19,7 @@ int netdev_nl_page_pool_get_dumpit(struct sk_buff *skb,
enum {
NETDEV_NLGRP_MGMT,
NETDEV_NLGRP_PAGE_POOL,
};
extern struct genl_family netdev_nl_family;

36
net/core/page_pool_user.c
View File

@ -135,6 +135,37 @@ page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool,
return -EMSGSIZE;
}
static void netdev_nl_page_pool_event(const struct page_pool *pool, u32 cmd)
{
struct genl_info info;
struct sk_buff *ntf;
struct net *net;
lockdep_assert_held(&page_pools_lock);
/* 'invisible' page pools don't matter */
if (hlist_unhashed(&pool->user.list))
return;
net = dev_net(pool->slow.netdev);
if (!genl_has_listeners(&netdev_nl_family, net, NETDEV_NLGRP_PAGE_POOL))
return;
genl_info_init_ntf(&info, &netdev_nl_family, cmd);
ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!ntf)
return;
if (page_pool_nl_fill(ntf, pool, &info)) {
nlmsg_free(ntf);
return;
}
genlmsg_multicast_netns(&netdev_nl_family, net, ntf,
0, NETDEV_NLGRP_PAGE_POOL, GFP_KERNEL);
}
int netdev_nl_page_pool_get_doit(struct sk_buff *skb, struct genl_info *info)
{
u32 id;
@ -168,6 +199,8 @@ int page_pool_list(struct page_pool *pool)
hlist_add_head(&pool->user.list,
&pool->slow.netdev->page_pools);
pool->user.napi_id = pool->p.napi ? pool->p.napi->napi_id : 0;
netdev_nl_page_pool_event(pool, NETDEV_CMD_PAGE_POOL_ADD_NTF);
}
mutex_unlock(&page_pools_lock);
@ -181,6 +214,7 @@ int page_pool_list(struct page_pool *pool)
void page_pool_unlist(struct page_pool *pool)
{
mutex_lock(&page_pools_lock);
netdev_nl_page_pool_event(pool, NETDEV_CMD_PAGE_POOL_DEL_NTF);
xa_erase(&page_pools, pool->user.id);
hlist_del(&pool->user.list);
mutex_unlock(&page_pools_lock);
@ -210,6 +244,8 @@ static void page_pool_unreg_netdev(struct net_device *netdev)
last = NULL;
hlist_for_each_entry(pool, &netdev->page_pools, user.list) {
pool->slow.netdev = lo;
netdev_nl_page_pool_event(pool,
NETDEV_CMD_PAGE_POOL_CHANGE_NTF);
last = pool;
}
if (last)