1209 	bool zc = false;  in tcp_sendmsg_locked()  local
1222 		zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1223 		if (!zc)  in tcp_sendmsg_locked()
1330 		if (skb_availroom(skb) > 0 && !zc) {  in tcp_sendmsg_locked()
1336 		} else if (!zc) {  in tcp_sendmsg_locked()
1817 					  struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_set_hint_for_skb()  argument
1825 	zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_set_hint_for_skb()
1841 		zc->recv_skip_hint -= partial_frag_remainder;  in tcp_zerocopy_set_hint_for_skb()
1849 	mappable_offset = find_next_mappable_frag(frag, zc->recv_skip_hint);  in tcp_zerocopy_set_hint_for_skb()
1850 	zc->recv_skip_hint = mappable_offset + partial_frag_remainder;  in tcp_zerocopy_set_hint_for_skb()
1858 				    struct tcp_zerocopy_receive *zc, int inq,  in receive_fallback_to_copy()  argument
1861 	unsigned long copy_address = (unsigned long)zc->copybuf_address;  in receive_fallback_to_copy()
1866 	zc->length = 0;  in receive_fallback_to_copy()
1867 	zc->recv_skip_hint = 0;  in receive_fallback_to_copy()
1869 	if (copy_address != zc->copybuf_address)  in receive_fallback_to_copy()
1878 				 tss, &zc->msg_flags);  in receive_fallback_to_copy()
1882 	zc->copybuf_len = err;  in receive_fallback_to_copy()
1883 	if (likely(zc->copybuf_len)) {  in receive_fallback_to_copy()
1889 			tcp_zerocopy_set_hint_for_skb(sk, zc, skb, offset);  in receive_fallback_to_copy()
1894 static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,  in tcp_copy_straggler_data()  argument
1898 	unsigned long copy_address = (unsigned long)zc->copybuf_address;  in tcp_copy_straggler_data()
1903 	if (copy_address != zc->copybuf_address)  in tcp_copy_straggler_data()
1913 	zc->recv_skip_hint -= copylen;  in tcp_copy_straggler_data()
1919 static int tcp_zc_handle_leftover(struct tcp_zerocopy_receive *zc,  in tcp_zc_handle_leftover()  argument
1926 	u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint);  in tcp_zc_handle_leftover()
1937 			zc->msg_flags |= TCP_CMSG_TS;  in tcp_zc_handle_leftover()
1941 	zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset,  in tcp_zc_handle_leftover()
1943 	return zc->copybuf_len < 0 ? 0 : copylen;  in tcp_zc_handle_leftover()
1952 					      struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_vm_insert_batch_error()  argument
1958 	    zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT) {  in tcp_zerocopy_vm_insert_batch_error()
1989 		zc->recv_skip_hint += bytes_not_mapped;  in tcp_zerocopy_vm_insert_batch_error()
2000 					struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_vm_insert_batch()  argument
2022 		pages_remaining, address, length, seq, zc, total_bytes_to_map,  in tcp_zerocopy_vm_insert_batch()
2028 				      struct tcp_zerocopy_receive *zc,  in tcp_zc_finalize_rx_tstamp()  argument
2034 	msg_control_addr = (unsigned long)zc->msg_control;  in tcp_zc_finalize_rx_tstamp()
2037 		(__kernel_size_t)zc->msg_controllen;  in tcp_zc_finalize_rx_tstamp()
2041 	zc->msg_flags = 0;  in tcp_zc_finalize_rx_tstamp()
2042 	if (zc->msg_control == msg_control_addr &&  in tcp_zc_finalize_rx_tstamp()
2043 	    zc->msg_controllen == cmsg_dummy.msg_controllen) {  in tcp_zc_finalize_rx_tstamp()
2045 		zc->msg_control = (__u64)  in tcp_zc_finalize_rx_tstamp()
2047 		zc->msg_controllen =  in tcp_zc_finalize_rx_tstamp()
2049 		zc->msg_flags = (__u32)cmsg_dummy.msg_flags;  in tcp_zc_finalize_rx_tstamp()
2055 				struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_receive()  argument
2059 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
2061 	s32 copybuf_len = zc->copybuf_len;  in tcp_zerocopy_receive()
2072 	zc->copybuf_len = 0;  in tcp_zerocopy_receive()
2073 	zc->msg_flags = 0;  in tcp_zerocopy_receive()
2075 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
2084 		return receive_fallback_to_copy(sk, zc, inq, tss);  in tcp_zerocopy_receive()
2087 		zc->length = 0;  in tcp_zerocopy_receive()
2088 		zc->recv_skip_hint = inq;  in tcp_zerocopy_receive()
2101 	vma_len = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
2105 		if (!(zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT))  in tcp_zerocopy_receive()
2107 		zc->length = total_bytes_to_map;  in tcp_zerocopy_receive()
2108 		zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
2110 		zc->length = avail_len;  in tcp_zerocopy_receive()
2111 		zc->recv_skip_hint = avail_len;  in tcp_zerocopy_receive()
2114 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
2118 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
2122 				if (zc->recv_skip_hint > 0)  in tcp_zerocopy_receive()
2132 				zc->msg_flags |= TCP_CMSG_TS;  in tcp_zerocopy_receive()
2134 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
2141 							  zc->recv_skip_hint);  in tcp_zerocopy_receive()
2143 			zc->recv_skip_hint = mappable_offset;  in tcp_zerocopy_receive()
2150 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
2153 		    zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
2160 							   &seq, zc,  in tcp_zerocopy_receive()
2170 						   zc, total_bytes_to_map);  in tcp_zerocopy_receive()
2176 		copylen = tcp_zc_handle_leftover(zc, sk, skb, &seq, copybuf_len, tss);  in tcp_zerocopy_receive()
2186 		if (length == zc->length)  in tcp_zerocopy_receive()
2187 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
2189 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
2192 	zc->length = length;  in tcp_zerocopy_receive()
4160 		struct tcp_zerocopy_receive zc = {};  in do_tcp_getsockopt()  local
4168 		if (unlikely(len > sizeof(zc))) {  in do_tcp_getsockopt()
4169 			err = check_zeroed_user(optval + sizeof(zc),  in do_tcp_getsockopt()
4170 						len - sizeof(zc));  in do_tcp_getsockopt()
4173 			len = sizeof(zc);  in do_tcp_getsockopt()
4177 		if (copy_from_user(&zc, optval, len))  in do_tcp_getsockopt()
4179 		if (zc.reserved)  in do_tcp_getsockopt()
4181 		if (zc.msg_flags &  ~(TCP_VALID_ZC_MSG_FLAGS))  in do_tcp_getsockopt()
4184 		err = tcp_zerocopy_receive(sk, &zc, &tss);  in do_tcp_getsockopt()
4186 							  &zc, &len, err);  in do_tcp_getsockopt()
4207 		if (zc.msg_flags & TCP_CMSG_TS)  in do_tcp_getsockopt()
4208 			tcp_zc_finalize_rx_tstamp(sk, &zc, &tss);  in do_tcp_getsockopt()
4210 			zc.msg_flags = 0;  in do_tcp_getsockopt()
4213 			zc.err = sock_error(sk);  in do_tcp_getsockopt()
4215 		zc.inq = tcp_inq_hint(sk);  in do_tcp_getsockopt()
4217 		if (!err && copy_to_user(optval, &zc, len))  in do_tcp_getsockopt()