Commit 37dfe5b8 authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

net: tap: change tap_alloc_skb() to allow bigger paged allocations 



tap_alloc_skb() is currently calling sock_alloc_send_pskb()
forcing order-0 page allocations.

Switch to PAGE_ALLOC_COSTLY_ORDER, to increase max size by 8x.

Also add logic to increase the linear part if needed.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Tahsin Erdogan <trdgn@amazon.com>
Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20230801205254.400094-5-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent ae6db08f

drivers/net/tap.c

+3 −1
Original line number Diff line number Diff line
@@ -614,8 +614,10 @@ static inline struct sk_buff *tap_alloc_skb(struct sock *sk, size_t prepad, 
	if (prepad + len < PAGE_SIZE || !linear)

		linear = len;



	if (len - linear > MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))

		linear = len - MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER);

	skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,

				   err, 0);

				   err, PAGE_ALLOC_COSTLY_ORDER);

	if (!skb)

		return NULL;