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net: allow __skb_ext_alloc to sleep

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mptcp calls this from the transmit side, from process context.
Allow a sleeping allocation instead of unconditional GFP_ATOMIC.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2020-05-16 10:46:23 +02:00 committed by David S. Miller
parent 5c8264435d
commit 4930f4831b
3 changed files with 9 additions and 5 deletions
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2
include/linux/skbuff.h
View File

@ -4165,7 +4165,7 @@ struct skb_ext {
char data[] __aligned(8);
};
struct skb_ext *__skb_ext_alloc(void);
struct skb_ext *__skb_ext_alloc(gfp_t flags);
void *__skb_ext_set(struct sk_buff *skb, enum skb_ext_id id,
struct skb_ext *ext);
void *skb_ext_add(struct sk_buff *skb, enum skb_ext_id id);

8
net/core/skbuff.c
View File

@ -6087,13 +6087,15 @@ static void *skb_ext_get_ptr(struct skb_ext *ext, enum skb_ext_id id)
/**
* __skb_ext_alloc - allocate a new skb extensions storage
*
* @flags: See kmalloc().
*
* Returns the newly allocated pointer. The pointer can later attached to a
* skb via __skb_ext_set().
* Note: caller must handle the skb_ext as an opaque data.
*/
struct skb_ext *__skb_ext_alloc(void)
struct skb_ext *__skb_ext_alloc(gfp_t flags)
{
struct skb_ext *new = kmem_cache_alloc(skbuff_ext_cache, GFP_ATOMIC);
struct skb_ext *new = kmem_cache_alloc(skbuff_ext_cache, flags);
if (new) {
memset(new->offset, 0, sizeof(new->offset));
@ -6188,7 +6190,7 @@ void *skb_ext_add(struct sk_buff *skb, enum skb_ext_id id)
} else {
newoff = SKB_EXT_CHUNKSIZEOF(*new);
new = __skb_ext_alloc();
new = __skb_ext_alloc(GFP_ATOMIC);
if (!new)
return NULL;
}

4
net/mptcp/protocol.c
View File

@ -367,8 +367,10 @@ static void mptcp_stop_timer(struct sock *sk)
static bool mptcp_ext_cache_refill(struct mptcp_sock *msk)
{
const struct sock *sk = (const struct sock *)msk;
if (!msk->cached_ext)
msk->cached_ext = __skb_ext_alloc();
msk->cached_ext = __skb_ext_alloc(sk->sk_allocation);
return !!msk->cached_ext;
}