diff options
Diffstat (limited to 'net/rds/rdma_transport.c')
| -rw-r--r-- | net/rds/rdma_transport.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c new file mode 100644 index 000000000..b15cf316b --- /dev/null +++ b/net/rds/rdma_transport.c @@ -0,0 +1,322 @@ +/* + * 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 <linux/module.h> +#include <rdma/rdma_cm.h> + +#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 + +/* Per IB specification 7.7.3, service level is a 4-bit field. */ +#define TOS_TO_SL(tos) ((tos) & 0xF) + +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: + if (conn) { + rdma_set_service_type(cm_id, conn->c_tos); + rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32); + /* 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) { + cm_id->route.path_rec[0].sl = + TOS_TO_SL(conn->c_tos); + ret = trans->cm_initiate_connect(cm_id, isv6); + } else { + rds_conn_drop(conn); + } + } + break; + + case RDMA_CM_EVENT_ESTABLISHED: + if (conn) + 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 && len >= sizeof(*err) && + ((*err) <= RDS_RDMA_REJ_INCOMPAT))) { + pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n", + &conn->c_laddr, &conn->c_faddr); + + if (!conn->c_tos) + conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; + + rds_conn_drop(conn); + } + rdsdebug("Connection rejected: %s\n", + rdma_reject_msg(cm_id, event->status)); + break; + 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: + if (!conn) + break; + 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 __init 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 __exit 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 <rds-devel@oss.oracle.com>"); +MODULE_DESCRIPTION("RDS: IB transport"); +MODULE_LICENSE("Dual BSD/GPL"); |