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[RFC,01/12] skbuff: add SKBFL_DONT_ORPHAN flag

Message ID 079685f334f479f70dfed5ab98e06fbfaf81ee3b.1638282789.git.asml.silence@gmail.com (mailing list archive)
State RFC
Delegated to: Netdev Maintainers
Headers show
Series io_uring zerocopy send | expand

Checks

Context Check Description
netdev/tree_selection success Guessing tree name failed - patch did not apply, async

Commit Message

Pavel Begunkov Nov. 30, 2021, 3:18 p.m. UTC 
We don't want to list every single ubuf_info callback in
skb_orphan_frags(), add a flag controlling the behaviour.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 include/linux/skbuff.h | 5 +++--
 net/core/skbuff.c      | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c8cb7e697d47..750b7518d6e2 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -459,6 +459,8 @@  enum {
 	 * charged to the kernel memory.
 	 */
 	SKBFL_PURE_ZEROCOPY = BIT(2),
+
+	SKBFL_DONT_ORPHAN = BIT(3),
 };
 
 #define SKBFL_ZEROCOPY_FRAG	(SKBFL_ZEROCOPY_ENABLE | SKBFL_SHARED_FRAG)
@@ -2839,8 +2841,7 @@  static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask)
 {
 	if (likely(!skb_zcopy(skb)))
 		return 0;
-	if (!skb_zcopy_is_nouarg(skb) &&
-	    skb_uarg(skb)->callback == msg_zerocopy_callback)
+	if (skb_shinfo(skb)->flags & SKBFL_DONT_ORPHAN)
 		return 0;
 	return skb_copy_ubufs(skb, gfp_mask);
 }
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index ba2f38246f07..b23db60ea6f9 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1191,7 +1191,7 @@  struct ubuf_info *msg_zerocopy_alloc(struct sock *sk, size_t size)
 	uarg->len = 1;
 	uarg->bytelen = size;
 	uarg->zerocopy = 1;
-	uarg->flags = SKBFL_ZEROCOPY_FRAG;
+	uarg->flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
 	refcount_set(&uarg->refcnt, 1);
 	sock_hold(sk);