| /* |
| * 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 <linux/slab.h> |
| #include <linux/sysctl.h> |
| #include <linux/module.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"); |
| |
| static unsigned int max_backlog = 1024; |
| |
| static struct ctl_table_header *ucma_ctl_table_hdr; |
| static ctl_table ucma_ctl_table[] = { |
| { |
| .procname = "max_backlog", |
| .data = &max_backlog, |
| .maxlen = sizeof max_backlog, |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { } |
| }; |
| |
| static struct ctl_path ucma_ctl_path[] = { |
| { .procname = "net" }, |
| { .procname = "rdma_ucm" }, |
| { } |
| }; |
| |
| 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->qp_type == IB_QPT_UD) |
| 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 int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type) |
| { |
| switch (cmd->ps) { |
| case RDMA_PS_TCP: |
| *qp_type = IB_QPT_RC; |
| return 0; |
| case RDMA_PS_UDP: |
| case RDMA_PS_IPOIB: |
| *qp_type = IB_QPT_UD; |
| return 0; |
| case RDMA_PS_IB: |
| *qp_type = cmd->qp_type; |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| 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; |
| enum ib_qp_type qp_type; |
| int ret; |
| |
| if (out_len < sizeof(resp)) |
| return -ENOSPC; |
| |
| if (copy_from_user(&cmd, inbuf, sizeof(cmd))) |
| return -EFAULT; |
| |
| ret = ucma_get_qp_type(&cmd, &qp_type); |
| if (ret) |
| return ret; |
| |
| 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, qp_type); |
| 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_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); |
| } |
| } |
| |
| /* |
| * We cannot hold file->mut when calling rdma_destroy_id() or we can |
| * deadlock. We also acquire file->mut in ucma_event_handler(), and |
| * rdma_destroy_id() will wait until all callbacks have completed. |
| */ |
| static int ucma_free_ctx(struct ucma_context *ctx) |
| { |
| int events_reported; |
| struct ucma_event *uevent, *tmp; |
| LIST_HEAD(list); |
| |
| /* 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); |
| list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { |
| if (uevent->ctx == ctx) |
| list_move_tail(&uevent->list, &list); |
| } |
| list_del(&ctx->list); |
| mutex_unlock(&ctx->file->mut); |
| |
| list_for_each_entry_safe(uevent, tmp, &list, list) { |
| list_del(&uevent->list); |
| if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) |
| rdma_destroy_id(uevent->cm_id); |
| kfree(uevent); |
| } |
| |
| 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 void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp, |
| struct rdma_route *route) |
| { |
| struct rdma_dev_addr *dev_addr; |
| struct net_device *dev; |
| u16 vid = 0; |
| |
| resp->num_paths = route->num_paths; |
| switch (route->num_paths) { |
| case 0: |
| dev_addr = &route->addr.dev_addr; |
| dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); |
| if (dev) { |
| vid = rdma_vlan_dev_vlan_id(dev); |
| dev_put(dev); |
| } |
| |
| iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid, |
| dev_addr->dst_dev_addr, vid); |
| iboe_addr_get_sgid(dev_addr, |
| (union ib_gid *) &resp->ib_route[0].sgid); |
| resp->ib_route[0].pkey = cpu_to_be16(0xffff); |
| 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 void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp, |
| struct rdma_route *route) |
| { |
| struct rdma_dev_addr *dev_addr; |
| |
| 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); |
| } |
| |
| 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: |
| switch (rdma_port_get_link_layer(ctx->cm_id->device, |
| ctx->cm_id->port_num)) { |
| case IB_LINK_LAYER_INFINIBAND: |
| ucma_copy_ib_route(&resp, &ctx->cm_id->route); |
| break; |
| case IB_LINK_LAYER_ETHERNET: |
| ucma_copy_iboe_route(&resp, &ctx->cm_id->route); |
| break; |
| default: |
| break; |
| } |
| break; |
| case RDMA_TRANSPORT_IWARP: |
| ucma_copy_iw_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 < max_backlog ? |
| cmd.backlog : 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) { |
| ucma_copy_conn_param(&conn_param, &cmd.conn_param); |
| mutex_lock(&file->mut); |
| ret = rdma_accept(ctx->cm_id, &conn_param); |
| if (!ret) |
| ctx->uid = cmd.uid; |
| mutex_unlock(&file->mut); |
| } 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; |
| case RDMA_OPTION_ID_REUSEADDR: |
| if (optlen != sizeof(int)) { |
| ret = -EINVAL; |
| break; |
| } |
| ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0); |
| 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 >= 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 nonseekable_open(inode, filp); |
| } |
| |
| 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, |
| .llseek = no_llseek, |
| }; |
| |
| static struct miscdevice ucma_misc = { |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = "rdma_cm", |
| .nodename = "infiniband/rdma_cm", |
| .mode = 0666, |
| .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 err1; |
| } |
| |
| ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table); |
| if (!ucma_ctl_table_hdr) { |
| printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n"); |
| ret = -ENOMEM; |
| goto err2; |
| } |
| return 0; |
| err2: |
| device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); |
| err1: |
| misc_deregister(&ucma_misc); |
| return ret; |
| } |
| |
| static void __exit ucma_cleanup(void) |
| { |
| unregister_sysctl_table(ucma_ctl_table_hdr); |
| 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); |