diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/sock.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index fd6afa267475..440afdca1e8f 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1847,7 +1847,17 @@ EXPORT_SYMBOL(sock_alloc_send_skb); /* On 32bit arches, an skb frag is limited to 2^15 */ #define SKB_FRAG_PAGE_ORDER get_order(32768) -bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) +/** + * skb_page_frag_refill - check that a page_frag contains enough room + * @sz: minimum size of the fragment we want to get + * @pfrag: pointer to page_frag + * @prio: priority for memory allocation + * + * Note: While this allocator tries to use high order pages, there is + * no guarantee that allocations succeed. Therefore, @sz MUST be + * less or equal than PAGE_SIZE. + */ +bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio) { int order; @@ -1856,16 +1866,16 @@ bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) pfrag->offset = 0; return true; } - if (pfrag->offset < pfrag->size) + if (pfrag->offset + sz <= pfrag->size) return true; put_page(pfrag->page); } /* We restrict high order allocations to users that can afford to wait */ - order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; + order = (prio & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; do { - gfp_t gfp = sk->sk_allocation; + gfp_t gfp = prio; if (order) gfp |= __GFP_COMP | __GFP_NOWARN; @@ -1877,6 +1887,15 @@ bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) } } while (--order >= 0); + return false; +} +EXPORT_SYMBOL(skb_page_frag_refill); + +bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) +{ + if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) + return true; + sk_enter_memory_pressure(sk); sk_stream_moderate_sndbuf(sk); return false; |