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net: reclaim skb->scm_io_uring bit

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Commit 0091bfc817 ("io_uring/af_unix: defer registered
files gc to io_uring release") added one bit to struct sk_buff.

This structure is critical for networking, and we try very hard
to not add bloat on it, unless absolutely required.

For instance, we can use a specific destructor as a wrapper
around unix_destruct_scm(), to identify skbs that unix_gc()
has to special case.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-03-07 14:59:59 +00:00 committed by David S. Miller
parent b3f4cd07df
commit 1036908045
5 changed files with 9 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/skbuff.h
View file

@ -810,7 +810,6 @@ typedef unsigned char *sk_buff_data_t;
* @csum_level: indicates the number of consecutive checksums found in * @csum_level: indicates the number of consecutive checksums found in
* the packet minus one that have been verified as * the packet minus one that have been verified as
* CHECKSUM_UNNECESSARY (max 3) * CHECKSUM_UNNECESSARY (max 3)
* @scm_io_uring: SKB holds io_uring registered files
* @dst_pending_confirm: need to confirm neighbour * @dst_pending_confirm: need to confirm neighbour
* @decrypted: Decrypted SKB * @decrypted: Decrypted SKB
* @slow_gro: state present at GRO time, slower prepare step required * @slow_gro: state present at GRO time, slower prepare step required
@ -989,7 +988,6 @@ struct sk_buff {
#endif #endif
__u8 slow_gro:1; __u8 slow_gro:1;
__u8 csum_not_inet:1; __u8 csum_not_inet:1;
__u8 scm_io_uring:1;
#ifdef CONFIG_NET_SCHED #ifdef CONFIG_NET_SCHED
__u16 tc_index; /* traffic control index */ __u16 tc_index; /* traffic control index */

1
include/net/af_unix.h
View file

@ -11,6 +11,7 @@
void unix_inflight(struct user_struct *user, struct file *fp); void unix_inflight(struct user_struct *user, struct file *fp);
void unix_notinflight(struct user_struct *user, struct file *fp); void unix_notinflight(struct user_struct *user, struct file *fp);
void unix_destruct_scm(struct sk_buff *skb); void unix_destruct_scm(struct sk_buff *skb);
void io_uring_destruct_scm(struct sk_buff *skb);
void unix_gc(void); void unix_gc(void);
void wait_for_unix_gc(void); void wait_for_unix_gc(void);
struct sock *unix_get_socket(struct file *filp); struct sock *unix_get_socket(struct file *filp);

3
io_uring/rsrc.c
View file

@ -867,8 +867,7 @@ int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file)
UNIXCB(skb).fp = fpl; UNIXCB(skb).fp = fpl;
skb->sk = sk; skb->sk = sk;
skb->scm_io_uring = 1; skb->destructor = io_uring_destruct_scm;
skb->destructor = unix_destruct_scm;
refcount_add(skb->truesize, &sk->sk_wmem_alloc); refcount_add(skb->truesize, &sk->sk_wmem_alloc);
} }

2
net/unix/garbage.c
View file

@ -305,7 +305,7 @@ void unix_gc(void)
* release.path eventually putting registered files. * release.path eventually putting registered files.
*/ */
skb_queue_walk_safe(&hitlist, skb, next_skb) { skb_queue_walk_safe(&hitlist, skb, next_skb) {
if (skb->scm_io_uring) { if (skb->destructor == io_uring_destruct_scm) {
__skb_unlink(skb, &hitlist); __skb_unlink(skb, &hitlist);
skb_queue_tail(&skb->sk->sk_receive_queue, skb); skb_queue_tail(&skb->sk->sk_receive_queue, skb);
} }

6
net/unix/scm.c
View file

@ -152,3 +152,9 @@ void unix_destruct_scm(struct sk_buff *skb)
sock_wfree(skb); sock_wfree(skb);
} }
EXPORT_SYMBOL(unix_destruct_scm); EXPORT_SYMBOL(unix_destruct_scm);
void io_uring_destruct_scm(struct sk_buff *skb)
{
unix_destruct_scm(skb);
}
EXPORT_SYMBOL(io_uring_destruct_scm);