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net: tun: change tun_alloc_skb() to allow bigger paged allocations

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

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

Also add logic to increase the linear part if needed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tahsin Erdogan <trdgn@amazon.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20230801205254.400094-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2023-08-01 20:52:52 +00:00
committed by Jakub Kicinski
parent 09c2c90705
commit ce7c7fef14
1 changed files with 3 additions and 1 deletions
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drivers/net/tun.c
+3 -1
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@@ -1526,8 +1526,10 @@ static struct sk_buff *tun_alloc_skb(struct tun_file *tfile,
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 ERR_PTR(err);