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