1201 	bool zc = false;  in tcp_sendmsg_locked()  local
1215 		zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1216 		if (!zc)  in tcp_sendmsg_locked()
1323 		if (skb_availroom(skb) > 0 && !zc) {  in tcp_sendmsg_locked()
1329 		} else if (!zc) {  in tcp_sendmsg_locked()
1780 static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,  in tcp_copy_straggler_data()  argument
1784 	unsigned long copy_address = (unsigned long)zc->copybuf_address;  in tcp_copy_straggler_data()
1789 	if (copy_address != zc->copybuf_address)  in tcp_copy_straggler_data()
1799 	zc->recv_skip_hint -= copylen;  in tcp_copy_straggler_data()
1805 static int tcp_zerocopy_handle_leftover_data(struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_handle_leftover_data()  argument
1811 	u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint);  in tcp_zerocopy_handle_leftover_data()
1821 	zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset,  in tcp_zerocopy_handle_leftover_data()
1823 	return zc->copybuf_len < 0 ? 0 : copylen;  in tcp_zerocopy_handle_leftover_data()
1832 					struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_vm_insert_batch()  argument
1851 		zc->recv_skip_hint += bytes_not_mapped;  in tcp_zerocopy_vm_insert_batch()
1857 				struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_receive()  argument
1860 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
1861 	s32 copybuf_len = zc->copybuf_len;  in tcp_zerocopy_receive()
1874 	zc->copybuf_len = 0;  in tcp_zerocopy_receive()
1876 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
1891 	vma_len = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
1896 		zc->length = aligned_len;  in tcp_zerocopy_receive()
1897 		zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1899 		zc->length = avail_len;  in tcp_zerocopy_receive()
1900 		zc->recv_skip_hint = avail_len;  in tcp_zerocopy_receive()
1904 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
1905 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
1914 								   &seq, zc);  in tcp_zerocopy_receive()
1920 				if (zc->recv_skip_hint > 0)  in tcp_zerocopy_receive()
1927 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
1933 			int remaining = zc->recv_skip_hint;  in tcp_zerocopy_receive()
1940 			zc->recv_skip_hint -= remaining;  in tcp_zerocopy_receive()
1946 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
1951 							   &seq, zc);  in tcp_zerocopy_receive()
1960 						   zc);  in tcp_zerocopy_receive()
1966 		copylen = tcp_zerocopy_handle_leftover_data(zc, sk, skb, &seq,  in tcp_zerocopy_receive()
1977 		if (length == zc->length)  in tcp_zerocopy_receive()
1978 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1980 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
1983 	zc->length = length;  in tcp_zerocopy_receive()
3919 		struct tcp_zerocopy_receive zc = {};  in do_tcp_getsockopt()  local
3927 		if (len > sizeof(zc)) {  in do_tcp_getsockopt()
3928 			len = sizeof(zc);  in do_tcp_getsockopt()
3932 		if (copy_from_user(&zc, optval, len))  in do_tcp_getsockopt()
3935 		err = tcp_zerocopy_receive(sk, &zc);  in do_tcp_getsockopt()
3950 			zc.err = sock_error(sk);  in do_tcp_getsockopt()
3952 		zc.inq = tcp_inq_hint(sk);  in do_tcp_getsockopt()
3954 		if (!err && copy_to_user(optval, &zc, len))  in do_tcp_getsockopt()