75 static void cbuf_add(struct cbuf *cb, int n)  in cbuf_add()  argument
77 	cb->len += n;  in cbuf_add()
80 static int cbuf_data(struct cbuf *cb)  in cbuf_data()  argument
82 	return ((cb->base + cb->len) & cb->mask);  in cbuf_data()
85 static void cbuf_init(struct cbuf *cb, int size)  in cbuf_init()  argument
87 	cb->base = cb->len = 0;  in cbuf_init()
88 	cb->mask = size-1;  in cbuf_init()
91 static void cbuf_eat(struct cbuf *cb, int n)  in cbuf_eat()  argument
93 	cb->len  -= n;  in cbuf_eat()
94 	cb->base += n;  in cbuf_eat()
95 	cb->base &= cb->mask;  in cbuf_eat()
98 static bool cbuf_empty(struct cbuf *cb)  in cbuf_empty()  argument
100 	return cb->len == 0;  in cbuf_empty()
120 	struct cbuf cb;  member
598 		cbuf_init(&con->cb, PAGE_CACHE_SIZE);  in receive_from_sock()
605 	iov[0].iov_len = con->cb.base - cbuf_data(&con->cb);  in receive_from_sock()
606 	iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb);  in receive_from_sock()
614 	if (cbuf_data(&con->cb) >= con->cb.base) {  in receive_from_sock()
615 		iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb);  in receive_from_sock()
616 		iov[1].iov_len = con->cb.base;  in receive_from_sock()
629 	cbuf_add(&con->cb, ret);  in receive_from_sock()
632 					  con->cb.base, con->cb.len,  in receive_from_sock()
636 			  page_address(con->rx_page), con->cb.base,  in receive_from_sock()
637 			  con->cb.len, r);  in receive_from_sock()
641 	cbuf_eat(&con->cb, ret);  in receive_from_sock()
643 	if (cbuf_empty(&con->cb) && !call_again_soon) {  in receive_from_sock()