1222 	bool zc = false;  in tcp_sendmsg_locked()  local
1233 			zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1240 			zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1241 			if (!zc)  in tcp_sendmsg_locked()
1347 		if (!zc) {  in tcp_sendmsg_locked()
1949 					  struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_set_hint_for_skb()  argument
1957 	zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_set_hint_for_skb()
1973 		zc->recv_skip_hint -= partial_frag_remainder;  in tcp_zerocopy_set_hint_for_skb()
1981 	mappable_offset = find_next_mappable_frag(frag, zc->recv_skip_hint);  in tcp_zerocopy_set_hint_for_skb()
1982 	zc->recv_skip_hint = mappable_offset + partial_frag_remainder;  in tcp_zerocopy_set_hint_for_skb()
1989 				    struct tcp_zerocopy_receive *zc, int inq,  in receive_fallback_to_copy()  argument
1992 	unsigned long copy_address = (unsigned long)zc->copybuf_address;  in receive_fallback_to_copy()
1997 	zc->length = 0;  in receive_fallback_to_copy()
1998 	zc->recv_skip_hint = 0;  in receive_fallback_to_copy()
2000 	if (copy_address != zc->copybuf_address)  in receive_fallback_to_copy()
2009 				 tss, &zc->msg_flags);  in receive_fallback_to_copy()
2013 	zc->copybuf_len = err;  in receive_fallback_to_copy()
2014 	if (likely(zc->copybuf_len)) {  in receive_fallback_to_copy()
2020 			tcp_zerocopy_set_hint_for_skb(sk, zc, skb, offset);  in receive_fallback_to_copy()
2025 static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,  in tcp_copy_straggler_data()  argument
2029 	unsigned long copy_address = (unsigned long)zc->copybuf_address;  in tcp_copy_straggler_data()
2034 	if (copy_address != zc->copybuf_address)  in tcp_copy_straggler_data()
2044 	zc->recv_skip_hint -= copylen;  in tcp_copy_straggler_data()
2050 static int tcp_zc_handle_leftover(struct tcp_zerocopy_receive *zc,  in tcp_zc_handle_leftover()  argument
2057 	u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint);  in tcp_zc_handle_leftover()
2068 			zc->msg_flags |= TCP_CMSG_TS;  in tcp_zc_handle_leftover()
2072 	zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset,  in tcp_zc_handle_leftover()
2074 	return zc->copybuf_len < 0 ? 0 : copylen;  in tcp_zc_handle_leftover()
2083 					      struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_vm_insert_batch_error()  argument
2089 	    zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT) {  in tcp_zerocopy_vm_insert_batch_error()
2120 		zc->recv_skip_hint += bytes_not_mapped;  in tcp_zerocopy_vm_insert_batch_error()
2131 					struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_vm_insert_batch()  argument
2153 		pages_remaining, address, length, seq, zc, total_bytes_to_map,  in tcp_zerocopy_vm_insert_batch()
2159 				      struct tcp_zerocopy_receive *zc,  in tcp_zc_finalize_rx_tstamp()  argument
2165 	msg_control_addr = (unsigned long)zc->msg_control;  in tcp_zc_finalize_rx_tstamp()
2168 		(__kernel_size_t)zc->msg_controllen;  in tcp_zc_finalize_rx_tstamp()
2172 	zc->msg_flags = 0;  in tcp_zc_finalize_rx_tstamp()
2173 	if (zc->msg_control == msg_control_addr &&  in tcp_zc_finalize_rx_tstamp()
2174 	    zc->msg_controllen == cmsg_dummy.msg_controllen) {  in tcp_zc_finalize_rx_tstamp()
2176 		zc->msg_control = (__u64)  in tcp_zc_finalize_rx_tstamp()
2178 		zc->msg_controllen =  in tcp_zc_finalize_rx_tstamp()
2180 		zc->msg_flags = (__u32)cmsg_dummy.msg_flags;  in tcp_zc_finalize_rx_tstamp()
2186 				struct tcp_zerocopy_receive *zc,  in tcp_zerocopy_receive()  argument
2190 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
2192 	s32 copybuf_len = zc->copybuf_len;  in tcp_zerocopy_receive()
2203 	zc->copybuf_len = 0;  in tcp_zerocopy_receive()
2204 	zc->msg_flags = 0;  in tcp_zerocopy_receive()
2206 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
2215 		return receive_fallback_to_copy(sk, zc, inq, tss);  in tcp_zerocopy_receive()
2218 		zc->length = 0;  in tcp_zerocopy_receive()
2219 		zc->recv_skip_hint = inq;  in tcp_zerocopy_receive()
2232 	vma_len = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
2236 		if (!(zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT))  in tcp_zerocopy_receive()
2238 		zc->length = total_bytes_to_map;  in tcp_zerocopy_receive()
2239 		zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
2241 		zc->length = avail_len;  in tcp_zerocopy_receive()
2242 		zc->recv_skip_hint = avail_len;  in tcp_zerocopy_receive()
2245 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
2249 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
2253 				if (zc->recv_skip_hint > 0)  in tcp_zerocopy_receive()
2263 				zc->msg_flags |= TCP_CMSG_TS;  in tcp_zerocopy_receive()
2265 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
2272 							  zc->recv_skip_hint);  in tcp_zerocopy_receive()
2274 			zc->recv_skip_hint = mappable_offset;  in tcp_zerocopy_receive()
2281 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
2284 		    zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
2291 							   &seq, zc,  in tcp_zerocopy_receive()
2301 						   zc, total_bytes_to_map);  in tcp_zerocopy_receive()
2307 		copylen = tcp_zc_handle_leftover(zc, sk, skb, &seq, copybuf_len, tss);  in tcp_zerocopy_receive()
2317 		if (length == zc->length)  in tcp_zerocopy_receive()
2318 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
2320 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
2323 	zc->length = length;  in tcp_zerocopy_receive()
4309 		struct tcp_zerocopy_receive zc = {};  in do_tcp_getsockopt()  local
4317 		if (unlikely(len > sizeof(zc))) {  in do_tcp_getsockopt()
4318 			err = check_zeroed_sockptr(optval, sizeof(zc),  in do_tcp_getsockopt()
4319 						   len - sizeof(zc));  in do_tcp_getsockopt()
4322 			len = sizeof(zc);  in do_tcp_getsockopt()
4326 		if (copy_from_sockptr(&zc, optval, len))  in do_tcp_getsockopt()
4328 		if (zc.reserved)  in do_tcp_getsockopt()
4330 		if (zc.msg_flags &  ~(TCP_VALID_ZC_MSG_FLAGS))  in do_tcp_getsockopt()
4333 		err = tcp_zerocopy_receive(sk, &zc, &tss);  in do_tcp_getsockopt()
4335 							  &zc, &len, err);  in do_tcp_getsockopt()
4356 		if (zc.msg_flags & TCP_CMSG_TS)  in do_tcp_getsockopt()
4357 			tcp_zc_finalize_rx_tstamp(sk, &zc, &tss);  in do_tcp_getsockopt()
4359 			zc.msg_flags = 0;  in do_tcp_getsockopt()
4362 			zc.err = sock_error(sk);  in do_tcp_getsockopt()
4364 		zc.inq = tcp_inq_hint(sk);  in do_tcp_getsockopt()
4366 		if (!err && copy_to_sockptr(optval, &zc, len))  in do_tcp_getsockopt()