bpf, sockmap: Call skb_linearize only when required in sk_psock_skb_ingress_enqueue
The skb_to_sgvec fails only when the number of frag_list and frags exceeds MAX_MSG_FRAGS. Therefore, we can call skb_linearize only when the conversion fails. Signed-off-by: NLiu Jian <liujian56@huawei.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NJohn Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20220427115150.210213-1-liujian56@huawei.com
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