drivers/net/virtio_net.c

683 static void *mergeable_len_to_ctx(unsigned int truesize,
686 	return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
719 				   unsigned int len, unsigned int truesize,
742 	tailroom = truesize - headroom  - hdr_padded_len - len;
747 		skb = virtnet_build_skb(buf, truesize, p - buf, len);
776 			skb_add_rx_frag(skb, 0, page, offset, len, truesize);
797 				frag_size, truesize);
1581 	unsigned int truesize, cur_frag_size;
1626 		truesize = mergeable_ctx_to_truesize(ctx);
1631 		cur_frag_size = truesize;
1633 		if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) {
1635 			pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1636 				 dev->name, len, (unsigned long)(truesize - room));
1668 	unsigned int truesize = mergeable_ctx_to_truesize(ctx);
1681 	 * with headroom may add hole in truesize, which
1685 	*frame_sz = truesize;
1805 	unsigned int truesize = mergeable_ctx_to_truesize(ctx);
1813 	if (unlikely(len > truesize - room)) {
1814 		pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1815 			 dev->name, len, (unsigned long)(truesize - room));
1834 	head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
1855 		truesize = mergeable_ctx_to_truesize(ctx);
1859 		if (unlikely(len > truesize - room)) {
1860 			pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1861 				 dev->name, len, (unsigned long)(truesize - room));
1877 			head_skb->truesize += nskb->truesize;
1883 			head_skb->truesize += truesize;
1889 					     len, truesize);
1892 					offset, len, truesize);
1996  * to store the headroom as the context ignoring the truesize.