/* * Copyright (c) 2005-2006 Intel Corporation. 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/completion.h> #include <linux/file.h> #include <linux/mutex.h> #include <linux/poll.h> #include <linux/sched.h> #include <linux/idr.h> #include <linux/in.h> #include <linux/in6.h> #include <linux/miscdevice.h> #include <rdma/rdma_user_cm.h> #include <rdma/ib_marshall.h> #include <rdma/rdma_cm.h> #include <rdma/rdma_cm_ib.h> MODULE_AUTHOR("Sean Hefty"); MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); MODULE_LICENSE("Dual BSD/GPL"); enum { UCMA_MAX_BACKLOG = 128 }; struct ucma_file { struct mutex mut; struct file *filp; struct list_head ctx_list; struct list_head event_list; wait_queue_head_t poll_wait; }; struct ucma_context { int id; struct completion comp; atomic_t ref; int events_reported; int backlog; struct ucma_file *file; struct rdma_cm_id *cm_id; u64 uid; struct list_head list; struct list_head mc_list; }; struct ucma_multicast { struct ucma_context *ctx; int id; int events_reported; u64 uid; struct list_head list; struct sockaddr_storage addr; }; struct ucma_event { struct ucma_context *ctx; struct ucma_multicast *mc; struct list_head list; struct rdma_cm_id *cm_id; struct rdma_ucm_event_resp resp; }; static DEFINE_MUTEX(mut); static DEFINE_IDR(ctx_idr); static DEFINE_IDR(multicast_idr); static inline struct ucma_context *_ucma_find_context(int id, struct ucma_file *file) { struct ucma_context *ctx; ctx = idr_find(&ctx_idr, id); if (!ctx) ctx = ERR_PTR(-ENOENT); else if (ctx->file != file) ctx = ERR_PTR(-EINVAL); return ctx; } static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) { struct ucma_context *ctx; mutex_lock(&mut); ctx = _ucma_find_context(id, file); if (!IS_ERR(ctx)) atomic_inc(&ctx->ref); mutex_unlock(&mut); return ctx; } static void ucma_put_ctx(struct ucma_context *ctx) { if (atomic_dec_and_test(&ctx->ref)) complete(&ctx->comp); } static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) { struct ucma_context *ctx; int ret; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return NULL; atomic_set(&ctx->ref, 1); init_completion(&ctx->comp); INIT_LIST_HEAD(&ctx->mc_list); ctx->file = file; do { ret = idr_pre_get(&ctx_idr, GFP_KERNEL); if (!ret) goto error; mutex_lock(&mut); ret = idr_get_new(&ctx_idr, ctx, &ctx->id); mutex_unlock(&mut); } while (ret == -EAGAIN); if (ret) goto error; list_add_tail(&ctx->list, &file->ctx_list); return ctx; error: kfree(ctx); return NULL; } static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx) { struct ucma_multicast *mc; int ret; mc = kzalloc(sizeof(*mc), GFP_KERNEL); if (!mc) return NULL; do { ret = idr_pre_get(&multicast_idr, GFP_KERNEL); if (!ret) goto error; mutex_lock(&mut); ret = idr_get_new(&multicast_idr, mc, &mc->id); mutex_unlock(&mut); } while (ret == -EAGAIN); if (ret) goto error; mc->ctx = ctx; list_add_tail(&mc->list, &ctx->mc_list); return mc; error: kfree(mc); return NULL; } static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst, struct rdma_conn_param *src) { if (src->private_data_len) memcpy(dst->private_data, src->private_data, src->private_data_len); dst->private_data_len = src->private_data_len; dst->responder_resources =src->responder_resources; dst->initiator_depth = src->initiator_depth; dst->flow_control = src->flow_control; dst->retry_count = src->retry_count; dst->rnr_retry_count = src->rnr_retry_count; dst->srq = src->srq; dst->qp_num = src->qp_num; } static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst, struct rdma_ud_param *src) { if (src->private_data_len) memcpy(dst->private_data, src->private_data, src->private_data_len); dst->private_data_len = src->private_data_len; ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr); dst->qp_num = src->qp_num; dst->qkey = src->qkey; } static void ucma_set_event_context(struct ucma_context *ctx, struct rdma_cm_event *event, struct ucma_event *uevent) { uevent->ctx = ctx; switch (event->event) { case RDMA_CM_EVENT_MULTICAST_JOIN: case RDMA_CM_EVENT_MULTICAST_ERROR: uevent->mc = (struct ucma_multicast *) event->param.ud.private_data; uevent->resp.uid = uevent->mc->uid; uevent->resp.id = uevent->mc->id; break; default: uevent->resp.uid = ctx->uid; uevent->resp.id = ctx->id; break; } } static int ucma_event_handler(struct rdma_cm_id *cm_id, struct rdma_cm_event *event) { struct ucma_event *uevent; struct ucma_context *ctx = cm_id->context; int ret = 0; uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); if (!uevent) return event->event == RDMA_CM_EVENT_CONNECT_REQUEST; uevent->cm_id = cm_id; ucma_set_event_context(ctx, event, uevent); uevent->resp.event = event->event; uevent->resp.status = event->status; if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB) ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud); else ucma_copy_conn_event(&uevent->resp.param.conn, &event->param.conn); mutex_lock(&ctx->file->mut); if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) { if (!ctx->backlog) { ret = -ENOMEM; kfree(uevent); goto out; } ctx->backlog--; } else if (!ctx->uid) { /* * We ignore events for new connections until userspace has set * their context. This can only happen if an error occurs on a * new connection before the user accepts it. This is okay, * since the accept will just fail later. */ kfree(uevent); goto out; } list_add_tail(&uevent->list, &ctx->file->event_list); wake_up_interruptible(&ctx->file->poll_wait); out: mutex_unlock(&ctx->file->mut); return ret; } static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct ucma_context *ctx; struct rdma_ucm_get_event cmd; struct ucma_event *uevent; int ret = 0; DEFINE_WAIT(wait); if (out_len < sizeof uevent->resp) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; mutex_lock(&file->mut); while (list_empty(&file->event_list)) { mutex_unlock(&file->mut); if (file->filp->f_flags & O_NONBLOCK) return -EAGAIN; if (wait_event_interruptible(file->poll_wait, !list_empty(&file->event_list))) return -ERESTARTSYS; mutex_lock(&file->mut); } uevent = list_entry(file->event_list.next, struct ucma_event, list); if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { ctx = ucma_alloc_ctx(file); if (!ctx) { ret = -ENOMEM; goto done; } uevent->ctx->backlog++; ctx->cm_id = uevent->cm_id; ctx->cm_id->context = ctx; uevent->resp.id = ctx->id; } if (copy_to_user((void __user *)(unsigned long)cmd.response, &uevent->resp, sizeof uevent->resp)) { ret = -EFAULT; goto done; } list_del(&uevent->list); uevent->ctx->events_reported++; if (uevent->mc) uevent->mc->events_reported++; kfree(uevent); done: mutex_unlock(&file->mut); return ret; } static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_create_id cmd; struct rdma_ucm_create_id_resp resp; struct ucma_context *ctx; int ret; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; mutex_lock(&file->mut); ctx = ucma_alloc_ctx(file); mutex_unlock(&file->mut); if (!ctx) return -ENOMEM; ctx->uid = cmd.uid; ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps); if (IS_ERR(ctx->cm_id)) { ret = PTR_ERR(ctx->cm_id); goto err1; } resp.id = ctx->id; if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) { ret = -EFAULT; goto err2; } return 0; err2: rdma_destroy_id(ctx->cm_id); err1: mutex_lock(&mut); idr_remove(&ctx_idr, ctx->id); mutex_unlock(&mut); kfree(ctx); return ret; } static void ucma_cleanup_multicast(struct ucma_context *ctx) { struct ucma_multicast *mc, *tmp; mutex_lock(&mut); list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { list_del(&mc->list); idr_remove(&multicast_idr, mc->id); kfree(mc); } mutex_unlock(&mut); } static void ucma_cleanup_events(struct ucma_context *ctx) { struct ucma_event *uevent, *tmp; list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { if (uevent->ctx != ctx) continue; list_del(&uevent->list); /* clear incoming connections. */ if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) rdma_destroy_id(uevent->cm_id); kfree(uevent); } } static void ucma_cleanup_mc_events(struct ucma_multicast *mc) { struct ucma_event *uevent, *tmp; list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { if (uevent->mc != mc) continue; list_del(&uevent->list); kfree(uevent); } } static int ucma_free_ctx(struct ucma_context *ctx) { int events_reported; /* No new events will be generated after destroying the id. */ rdma_destroy_id(ctx->cm_id); ucma_cleanup_multicast(ctx); /* Cleanup events not yet reported to the user. */ mutex_lock(&ctx->file->mut); ucma_cleanup_events(ctx); list_del(&ctx->list); mutex_unlock(&ctx->file->mut); events_reported = ctx->events_reported; kfree(ctx); return events_reported; } static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_destroy_id cmd; struct rdma_ucm_destroy_id_resp resp; struct ucma_context *ctx; int ret = 0; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; mutex_lock(&mut); ctx = _ucma_find_context(cmd.id, file); if (!IS_ERR(ctx)) idr_remove(&ctx_idr, ctx->id); mutex_unlock(&mut); if (IS_ERR(ctx)) return PTR_ERR(ctx); ucma_put_ctx(ctx); wait_for_completion(&ctx->comp); resp.events_reported = ucma_free_ctx(ctx); if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) ret = -EFAULT; return ret; } static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_bind_addr cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_resolve_addr(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_resolve_addr cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_resolve_route(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_resolve_route cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); ucma_put_ctx(ctx); return ret; } static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, struct rdma_route *route) { struct rdma_dev_addr *dev_addr; resp->num_paths = route->num_paths; switch (route->num_paths) { case 0: dev_addr = &route->addr.dev_addr; rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid); rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid); resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); break; case 2: ib_copy_path_rec_to_user(&resp->ib_route[1], &route->path_rec[1]); /* fall through */ case 1: ib_copy_path_rec_to_user(&resp->ib_route[0], &route->path_rec[0]); break; default: break; } } static ssize_t ucma_query_route(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_query_route cmd; struct rdma_ucm_query_route_resp resp; struct ucma_context *ctx; struct sockaddr *addr; int ret = 0; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); memset(&resp, 0, sizeof resp); addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)); addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)); if (!ctx->cm_id->device) goto out; resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid; resp.port_num = ctx->cm_id->port_num; switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { case RDMA_TRANSPORT_IB: ucma_copy_ib_route(&resp, &ctx->cm_id->route); break; default: break; } out: if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) ret = -EFAULT; ucma_put_ctx(ctx); return ret; } static void ucma_copy_conn_param(struct rdma_conn_param *dst, struct rdma_ucm_conn_param *src) { dst->private_data = src->private_data; dst->private_data_len = src->private_data_len; dst->responder_resources =src->responder_resources; dst->initiator_depth = src->initiator_depth; dst->flow_control = src->flow_control; dst->retry_count = src->retry_count; dst->rnr_retry_count = src->rnr_retry_count; dst->srq = src->srq; dst->qp_num = src->qp_num; } static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_connect cmd; struct rdma_conn_param conn_param; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; if (!cmd.conn_param.valid) return -EINVAL; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ucma_copy_conn_param(&conn_param, &cmd.conn_param); ret = rdma_connect(ctx->cm_id, &conn_param); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_listen cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ? cmd.backlog : UCMA_MAX_BACKLOG; ret = rdma_listen(ctx->cm_id, ctx->backlog); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_accept cmd; struct rdma_conn_param conn_param; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); if (cmd.conn_param.valid) { ctx->uid = cmd.uid; ucma_copy_conn_param(&conn_param, &cmd.conn_param); ret = rdma_accept(ctx->cm_id, &conn_param); } else ret = rdma_accept(ctx->cm_id, NULL); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_reject cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_disconnect cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_disconnect(ctx->cm_id); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_init_qp_attr(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_init_qp_attr cmd; struct ib_uverbs_qp_attr resp; struct ucma_context *ctx; struct ib_qp_attr qp_attr; int ret; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); resp.qp_attr_mask = 0; memset(&qp_attr, 0, sizeof qp_attr); qp_attr.qp_state = cmd.qp_state; ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); if (ret) goto out; ib_copy_qp_attr_to_user(&resp, &qp_attr); if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) ret = -EFAULT; out: ucma_put_ctx(ctx); return ret; } static int ucma_set_option_id(struct ucma_context *ctx, int optname, void *optval, size_t optlen) { int ret = 0; switch (optname) { case RDMA_OPTION_ID_TOS: if (optlen != sizeof(u8)) { ret = -EINVAL; break; } rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); break; default: ret = -ENOSYS; } return ret; } static int ucma_set_ib_path(struct ucma_context *ctx, struct ib_path_rec_data *path_data, size_t optlen) { struct ib_sa_path_rec sa_path; struct rdma_cm_event event; int ret; if (optlen % sizeof(*path_data)) return -EINVAL; for (; optlen; optlen -= sizeof(*path_data), path_data++) { if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY | IB_PATH_BIDIRECTIONAL)) break; } if (!optlen) return -EINVAL; ib_sa_unpack_path(path_data->path_rec, &sa_path); ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1); if (ret) return ret; memset(&event, 0, sizeof event); event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; return ucma_event_handler(ctx->cm_id, &event); } static int ucma_set_option_ib(struct ucma_context *ctx, int optname, void *optval, size_t optlen) { int ret; switch (optname) { case RDMA_OPTION_IB_PATH: ret = ucma_set_ib_path(ctx, optval, optlen); break; default: ret = -ENOSYS; } return ret; } static int ucma_set_option_level(struct ucma_context *ctx, int level, int optname, void *optval, size_t optlen) { int ret; switch (level) { case RDMA_OPTION_ID: ret = ucma_set_option_id(ctx, optname, optval, optlen); break; case RDMA_OPTION_IB: ret = ucma_set_option_ib(ctx, optname, optval, optlen); break; default: ret = -ENOSYS; } return ret; } static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_set_option cmd; struct ucma_context *ctx; void *optval; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); optval = kmalloc(cmd.optlen, GFP_KERNEL); if (!optval) { ret = -ENOMEM; goto out1; } if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, cmd.optlen)) { ret = -EFAULT; goto out2; } ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, cmd.optlen); out2: kfree(optval); out1: ucma_put_ctx(ctx); return ret; } static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_notify cmd; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_join_multicast(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_join_mcast cmd; struct rdma_ucm_create_id_resp resp; struct ucma_context *ctx; struct ucma_multicast *mc; int ret; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); mutex_lock(&file->mut); mc = ucma_alloc_multicast(ctx); if (!mc) { ret = -ENOMEM; goto err1; } mc->uid = cmd.uid; memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc); if (ret) goto err2; resp.id = mc->id; if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) { ret = -EFAULT; goto err3; } mutex_unlock(&file->mut); ucma_put_ctx(ctx); return 0; err3: rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); ucma_cleanup_mc_events(mc); err2: mutex_lock(&mut); idr_remove(&multicast_idr, mc->id); mutex_unlock(&mut); list_del(&mc->list); kfree(mc); err1: mutex_unlock(&file->mut); ucma_put_ctx(ctx); return ret; } static ssize_t ucma_leave_multicast(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_destroy_id cmd; struct rdma_ucm_destroy_id_resp resp; struct ucma_multicast *mc; int ret = 0; if (out_len < sizeof(resp)) return -ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; mutex_lock(&mut); mc = idr_find(&multicast_idr, cmd.id); if (!mc) mc = ERR_PTR(-ENOENT); else if (mc->ctx->file != file) mc = ERR_PTR(-EINVAL); else { idr_remove(&multicast_idr, mc->id); atomic_inc(&mc->ctx->ref); } mutex_unlock(&mut); if (IS_ERR(mc)) { ret = PTR_ERR(mc); goto out; } rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); mutex_lock(&mc->ctx->file->mut); ucma_cleanup_mc_events(mc); list_del(&mc->list); mutex_unlock(&mc->ctx->file->mut); ucma_put_ctx(mc->ctx); resp.events_reported = mc->events_reported; kfree(mc); if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) ret = -EFAULT; out: return ret; } static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2) { /* Acquire mutex's based on pointer comparison to prevent deadlock. */ if (file1 < file2) { mutex_lock(&file1->mut); mutex_lock(&file2->mut); } else { mutex_lock(&file2->mut); mutex_lock(&file1->mut); } } static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2) { if (file1 < file2) { mutex_unlock(&file2->mut); mutex_unlock(&file1->mut); } else { mutex_unlock(&file1->mut); mutex_unlock(&file2->mut); } } static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file) { struct ucma_event *uevent, *tmp; list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) if (uevent->ctx == ctx) list_move_tail(&uevent->list, &file->event_list); } static ssize_t ucma_migrate_id(struct ucma_file *new_file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_migrate_id cmd; struct rdma_ucm_migrate_resp resp; struct ucma_context *ctx; struct file *filp; struct ucma_file *cur_file; int ret = 0; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; /* Get current fd to protect against it being closed */ filp = fget(cmd.fd); if (!filp) return -ENOENT; /* Validate current fd and prevent destruction of id. */ ctx = ucma_get_ctx(filp->private_data, cmd.id); if (IS_ERR(ctx)) { ret = PTR_ERR(ctx); goto file_put; } cur_file = ctx->file; if (cur_file == new_file) { resp.events_reported = ctx->events_reported; goto response; } /* * Migrate events between fd's, maintaining order, and avoiding new * events being added before existing events. */ ucma_lock_files(cur_file, new_file); mutex_lock(&mut); list_move_tail(&ctx->list, &new_file->ctx_list); ucma_move_events(ctx, new_file); ctx->file = new_file; resp.events_reported = ctx->events_reported; mutex_unlock(&mut); ucma_unlock_files(cur_file, new_file); response: if (copy_to_user((void __user *)(unsigned long)cmd.response, &resp, sizeof(resp))) ret = -EFAULT; ucma_put_ctx(ctx); file_put: fput(filp); return ret; } static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) = { [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, [RDMA_USER_CM_CMD_REJECT] = ucma_reject, [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, [RDMA_USER_CM_CMD_GET_OPTION] = NULL, [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id }; static ssize_t ucma_write(struct file *filp, const char __user *buf, size_t len, loff_t *pos) { struct ucma_file *file = filp->private_data; struct rdma_ucm_cmd_hdr hdr; ssize_t ret; if (len < sizeof(hdr)) return -EINVAL; if (copy_from_user(&hdr, buf, sizeof(hdr))) return -EFAULT; if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) return -EINVAL; if (hdr.in + sizeof(hdr) > len) return -EINVAL; if (!ucma_cmd_table[hdr.cmd]) return -ENOSYS; ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); if (!ret) ret = len; return ret; } static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) { struct ucma_file *file = filp->private_data; unsigned int mask = 0; poll_wait(filp, &file->poll_wait, wait); if (!list_empty(&file->event_list)) mask = POLLIN | POLLRDNORM; return mask; } /* * ucma_open() does not need the BKL: * * - no global state is referred to; * - there is no ioctl method to race against; * - no further module initialization is required for open to work * after the device is registered. */ static int ucma_open(struct inode *inode, struct file *filp) { struct ucma_file *file; file = kmalloc(sizeof *file, GFP_KERNEL); if (!file) return -ENOMEM; INIT_LIST_HEAD(&file->event_list); INIT_LIST_HEAD(&file->ctx_list); init_waitqueue_head(&file->poll_wait); mutex_init(&file->mut); filp->private_data = file; file->filp = filp; return 0; } static int ucma_close(struct inode *inode, struct file *filp) { struct ucma_file *file = filp->private_data; struct ucma_context *ctx, *tmp; mutex_lock(&file->mut); list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { mutex_unlock(&file->mut); mutex_lock(&mut); idr_remove(&ctx_idr, ctx->id); mutex_unlock(&mut); ucma_free_ctx(ctx); mutex_lock(&file->mut); } mutex_unlock(&file->mut); kfree(file); return 0; } static const struct file_operations ucma_fops = { .owner = THIS_MODULE, .open = ucma_open, .release = ucma_close, .write = ucma_write, .poll = ucma_poll, }; static struct miscdevice ucma_misc = { .minor = MISC_DYNAMIC_MINOR, .name = "rdma_cm", .fops = &ucma_fops, }; static ssize_t show_abi_version(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); } static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); static int __init ucma_init(void) { int ret; ret = misc_register(&ucma_misc); if (ret) return ret; ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); if (ret) { printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); goto err; } return 0; err: misc_deregister(&ucma_misc); return ret; } static void __exit ucma_cleanup(void) { device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); misc_deregister(&ucma_misc); idr_destroy(&ctx_idr); } module_init(ucma_init); module_exit(ucma_cleanup);