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While working on virtio_net new allocation strategy to increase
payload/truesize ratio, we found that refactoring sk_page_frag_refill()
was needed.
This patch splits sk_page_frag_refill() into two parts, adding
skb_page_frag_refill() which can be used without a socket.
While we are at it, add a minimum frag size of 32 for
sk_page_frag_refill()
Michael will either use netdev_alloc_frag() from softirq context,
or skb_page_frag_refill() from process context in refill_work()
(GFP_KERNEL allocations)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Michael Dalton <mwdalton@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
400dfd3ae8