/* * Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ #include #include #include "rds_single_path.h" #include "rdma_transport.h" #include "ib.h" /* Global IPv4 and IPv6 RDS RDMA listener cm_id */ static struct rdma_cm_id *rds_rdma_listen_id; #if IS_ENABLED(CONFIG_IPV6) static struct rdma_cm_id *rds6_rdma_listen_id; #endif static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id, struct rdma_cm_event *event, bool isv6) { /* this can be null in the listening path */ struct rds_connection *conn = cm_id->context; struct rds_transport *trans; int ret = 0; int *err; u8 len; rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, event->event, rdma_event_msg(event->event)); if (cm_id->device->node_type == RDMA_NODE_IB_CA) trans = &rds_ib_transport; /* Prevent shutdown from tearing down the connection * while we're executing. */ if (conn) { mutex_lock(&conn->c_cm_lock); /* If the connection is being shut down, bail out * right away. We return 0 so cm_id doesn't get * destroyed prematurely */ if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { /* Reject incoming connections while we're tearing * down an existing one. */ if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) ret = 1; goto out; } } switch (event->event) { case RDMA_CM_EVENT_CONNECT_REQUEST: ret = trans->cm_handle_connect(cm_id, event, isv6); break; case RDMA_CM_EVENT_ADDR_RESOLVED: rdma_set_service_type(cm_id, conn->c_tos); /* XXX do we need to clean up if this fails? */ ret = rdma_resolve_route(cm_id, RDS_RDMA_RESOLVE_TIMEOUT_MS); break; case RDMA_CM_EVENT_ROUTE_RESOLVED: /* Connection could have been dropped so make sure the * cm_id is valid before proceeding */ if (conn) { struct rds_ib_connection *ibic; ibic = conn->c_transport_data; if (ibic && ibic->i_cm_id == cm_id) ret = trans->cm_initiate_connect(cm_id, isv6); else rds_conn_drop(conn); } break; case RDMA_CM_EVENT_ESTABLISHED: trans->cm_connect_complete(conn, event); break; case RDMA_CM_EVENT_REJECTED: if (!conn) break; err = (int *)rdma_consumer_reject_data(cm_id, event, &len); if (!err || (err && ((*err) == RDS_RDMA_REJ_INCOMPAT))) { pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n", &conn->c_laddr, &conn->c_faddr); conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; conn->c_tos = 0; rds_conn_drop(conn); } rdsdebug("Connection rejected: %s\n", rdma_reject_msg(cm_id, event->status)); break; /* FALLTHROUGH */ case RDMA_CM_EVENT_ADDR_ERROR: case RDMA_CM_EVENT_ROUTE_ERROR: case RDMA_CM_EVENT_CONNECT_ERROR: case RDMA_CM_EVENT_UNREACHABLE: case RDMA_CM_EVENT_DEVICE_REMOVAL: case RDMA_CM_EVENT_ADDR_CHANGE: if (conn) rds_conn_drop(conn); break; case RDMA_CM_EVENT_DISCONNECTED: rdsdebug("DISCONNECT event - dropping connection " "%pI6c->%pI6c\n", &conn->c_laddr, &conn->c_faddr); rds_conn_drop(conn); break; case RDMA_CM_EVENT_TIMEWAIT_EXIT: if (conn) { pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n", &conn->c_laddr, &conn->c_faddr); rds_conn_drop(conn); } break; default: /* things like device disconnect? */ printk(KERN_ERR "RDS: unknown event %u (%s)!\n", event->event, rdma_event_msg(event->event)); break; } out: if (conn) mutex_unlock(&conn->c_cm_lock); rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, rdma_event_msg(event->event), ret); return ret; } int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, struct rdma_cm_event *event) { return rds_rdma_cm_event_handler_cmn(cm_id, event, false); } #if IS_ENABLED(CONFIG_IPV6) int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id, struct rdma_cm_event *event) { return rds_rdma_cm_event_handler_cmn(cm_id, event, true); } #endif static int rds_rdma_listen_init_common(rdma_cm_event_handler handler, struct sockaddr *sa, struct rdma_cm_id **ret_cm_id) { struct rdma_cm_id *cm_id; int ret; cm_id = rdma_create_id(&init_net, handler, NULL, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(cm_id)) { ret = PTR_ERR(cm_id); printk(KERN_ERR "RDS/RDMA: failed to setup listener, " "rdma_create_id() returned %d\n", ret); return ret; } /* * XXX I bet this binds the cm_id to a device. If we want to support * fail-over we'll have to take this into consideration. */ ret = rdma_bind_addr(cm_id, sa); if (ret) { printk(KERN_ERR "RDS/RDMA: failed to setup listener, " "rdma_bind_addr() returned %d\n", ret); goto out; } ret = rdma_listen(cm_id, 128); if (ret) { printk(KERN_ERR "RDS/RDMA: failed to setup listener, " "rdma_listen() returned %d\n", ret); goto out; } rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); *ret_cm_id = cm_id; cm_id = NULL; out: if (cm_id) rdma_destroy_id(cm_id); return ret; } /* Initialize the RDS RDMA listeners. We create two listeners for * compatibility reason. The one on RDS_PORT is used for IPv4 * requests only. The one on RDS_CM_PORT is used for IPv6 requests * only. So only IPv6 enabled RDS module will communicate using this * port. */ static int rds_rdma_listen_init(void) { int ret; #if IS_ENABLED(CONFIG_IPV6) struct sockaddr_in6 sin6; #endif struct sockaddr_in sin; sin.sin_family = PF_INET; sin.sin_addr.s_addr = htonl(INADDR_ANY); sin.sin_port = htons(RDS_PORT); ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler, (struct sockaddr *)&sin, &rds_rdma_listen_id); if (ret != 0) return ret; #if IS_ENABLED(CONFIG_IPV6) sin6.sin6_family = PF_INET6; sin6.sin6_addr = in6addr_any; sin6.sin6_port = htons(RDS_CM_PORT); sin6.sin6_scope_id = 0; sin6.sin6_flowinfo = 0; ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler, (struct sockaddr *)&sin6, &rds6_rdma_listen_id); /* Keep going even when IPv6 is not enabled in the system. */ if (ret != 0) rdsdebug("Cannot set up IPv6 RDMA listener\n"); #endif return 0; } static void rds_rdma_listen_stop(void) { if (rds_rdma_listen_id) { rdsdebug("cm %p\n", rds_rdma_listen_id); rdma_destroy_id(rds_rdma_listen_id); rds_rdma_listen_id = NULL; } #if IS_ENABLED(CONFIG_IPV6) if (rds6_rdma_listen_id) { rdsdebug("cm %p\n", rds6_rdma_listen_id); rdma_destroy_id(rds6_rdma_listen_id); rds6_rdma_listen_id = NULL; } #endif } static int rds_rdma_init(void) { int ret; ret = rds_ib_init(); if (ret) goto out; ret = rds_rdma_listen_init(); if (ret) rds_ib_exit(); out: return ret; } module_init(rds_rdma_init); static void rds_rdma_exit(void) { /* stop listening first to ensure no new connections are attempted */ rds_rdma_listen_stop(); rds_ib_exit(); } module_exit(rds_rdma_exit); MODULE_AUTHOR("Oracle Corporation "); MODULE_DESCRIPTION("RDS: IB transport"); MODULE_LICENSE("Dual BSD/GPL");