41 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
475 				  unsigned int headroom)  in mergeable_len_to_ctx()  argument
477 	return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);  in mergeable_len_to_ctx()
491 					 unsigned int headroom,  in virtnet_build_skb()  argument
500 	skb_reserve(skb, headroom);  in virtnet_build_skb()
511 				   unsigned int headroom)  in page_to_skb()  argument
529 	buf = p - headroom;  in page_to_skb()
533 	tailroom = truesize - headroom  - hdr_padded_len - len;  in page_to_skb()
850 	if (unlikely(xdpf->headroom < vi->hdr_len))  in __virtnet_xdp_xmit_one()
862 	 * xdpf->headroom. Therefore, we need to update the value of  in __virtnet_xdp_xmit_one()
863 	 * headroom synchronously here.  in __virtnet_xdp_xmit_one()
865 	xdpf->headroom -= vi->hdr_len;  in __virtnet_xdp_xmit_one()
1079  * 2) Headroom space is insufficient.
1083  * with large buffers with sufficient headroom - so it should affect
1088  * have enough headroom.
1136 	/* Headroom does not contribute to packet length */  in xdp_linearize_page()
1150 	unsigned int headroom;  in receive_small_build_skb()  local
1155 	headroom = vi->hdr_len + header_offset;  in receive_small_build_skb()
1156 	buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +  in receive_small_build_skb()
1159 	skb = virtnet_build_skb(buf, buflen, headroom, len);  in receive_small_build_skb()
1180 	unsigned int headroom = vi->hdr_len + header_offset;  in receive_small_xdp()  local
1193 	buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +  in receive_small_xdp()
1203 		headroom = vi->hdr_len + header_offset;  in receive_small_xdp()
1204 		buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +  in receive_small_xdp()
1361 	unsigned int headroom, data_len;  in build_skb_from_xdp_buff()  local
1378 	headroom = xdp->data - xdp->data_hard_start;  in build_skb_from_xdp_buff()
1380 	skb_reserve(skb, headroom);  in build_skb_from_xdp_buff()
1410 	unsigned int headroom, tailroom, room;  in virtnet_build_xdp_buff_mrg()  local
1457 		headroom = mergeable_ctx_to_headroom(ctx);  in virtnet_build_xdp_buff_mrg()
1458 		tailroom = headroom ? sizeof(struct skb_shared_info) : 0;  in virtnet_build_xdp_buff_mrg()
1459 		room = SKB_DATA_ALIGN(headroom + tailroom);  in virtnet_build_xdp_buff_mrg()
1499 	unsigned int headroom = mergeable_ctx_to_headroom(ctx);  in mergeable_xdp_get_buf()  local
1511 	 * with headroom may add hole in truesize, which  in mergeable_xdp_get_buf()
1517 	if (likely(headroom >= virtnet_get_headroom(vi) &&  in mergeable_xdp_get_buf()
1522 	/* This happens when headroom is not enough because  in mergeable_xdp_get_buf()
1636 	unsigned int headroom = mergeable_ctx_to_headroom(ctx);  in receive_mergeable()  local
1637 	unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;  in receive_mergeable()
1638 	unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);  in receive_mergeable()
1664 	head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);  in receive_mergeable()
1686 		headroom = mergeable_ctx_to_headroom(ctx);  in receive_mergeable()
1687 		tailroom = headroom ? sizeof(struct skb_shared_info) : 0;  in receive_mergeable()
1688 		room = SKB_DATA_ALIGN(headroom + tailroom);  in receive_mergeable()
1824  * same size, except for the headroom. For this reason we do
1826  * to store the headroom as the context ignoring the truesize.
1927 	unsigned int headroom = virtnet_get_headroom(vi);  in add_recvbuf_mergeable()  local
1928 	unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;  in add_recvbuf_mergeable()
1929 	unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);  in add_recvbuf_mergeable()
1945 	buf += headroom; /* advance address leaving hole at front of pkt */  in add_recvbuf_mergeable()
1954 		if (!headroom)  in add_recvbuf_mergeable()
1961 	ctx = mergeable_len_to_ctx(len + room, headroom);  in add_recvbuf_mergeable()
4258 	unsigned int headroom = virtnet_get_headroom(vi);  in mergeable_rx_buffer_size_show()  local
4259 	unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;  in mergeable_rx_buffer_size_show()
4266 				       SKB_DATA_ALIGN(headroom + tailroom)));  in mergeable_rx_buffer_size_show()