-/* the core send_sem serializes this with other xmit and shutdown */
-int rds_tcp_xmit_cong_map(struct rds_connection *conn,
- struct rds_cong_map *map, unsigned long offset)
-{
- static struct rds_header rds_tcp_map_header = {
- .h_flags = RDS_FLAG_CONG_BITMAP,
- };
- struct rds_tcp_connection *tc = conn->c_transport_data;
- unsigned long i;
- int ret;
- int copied = 0;
-
- /* Some problem claims cpu_to_be32(constant) isn't a constant. */
- rds_tcp_map_header.h_len = cpu_to_be32(RDS_CONG_MAP_BYTES);
-
- if (offset < sizeof(struct rds_header)) {
- ret = rds_tcp_sendmsg(tc->t_sock,
- (void *)&rds_tcp_map_header + offset,
- sizeof(struct rds_header) - offset);
- if (ret <= 0)
- return ret;
- offset += ret;
- copied = ret;
- if (offset < sizeof(struct rds_header))
- return ret;
- }
-
- offset -= sizeof(struct rds_header);
- i = offset / PAGE_SIZE;
- offset = offset % PAGE_SIZE;
- BUG_ON(i >= RDS_CONG_MAP_PAGES);
-
- do {
- ret = tc->t_sock->ops->sendpage(tc->t_sock,
- virt_to_page(map->m_page_addrs[i]),
- offset, PAGE_SIZE - offset,
- MSG_DONTWAIT);
- if (ret <= 0)
- break;
- copied += ret;
- offset += ret;
- if (offset == PAGE_SIZE) {
- offset = 0;
- i++;
- }
- } while (i < RDS_CONG_MAP_PAGES);
-
- return copied ? copied : ret;
-}
-