diff options
Diffstat (limited to 'drivers/infiniband/core/ucma.c')
| -rw-r--r-- | drivers/infiniband/core/ucma.c | 1896 |
1 files changed, 1896 insertions, 0 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c new file mode 100644 index 0000000000..bf42650f12 --- /dev/null +++ b/drivers/infiniband/core/ucma.c @@ -0,0 +1,1896 @@ +/* + * 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 <linux/nsproxy.h> + +#include <linux/nospec.h> + +#include <rdma/rdma_user_cm.h> +#include <rdma/ib_marshall.h> +#include <rdma/rdma_cm.h> +#include <rdma/rdma_cm_ib.h> +#include <rdma/ib_addr.h> +#include <rdma/ib.h> +#include <rdma/ib_cm.h> +#include <rdma/rdma_netlink.h> +#include "core_priv.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 struct ctl_table ucma_ctl_table[] = { + { + .procname = "max_backlog", + .data = &max_backlog, + .maxlen = sizeof max_backlog, + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { } +}; + +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 { + u32 id; + struct completion comp; + refcount_t ref; + int events_reported; + atomic_t backlog; + + struct ucma_file *file; + struct rdma_cm_id *cm_id; + struct mutex mutex; + u64 uid; + + struct list_head list; + struct list_head mc_list; + struct work_struct close_work; +}; + +struct ucma_multicast { + struct ucma_context *ctx; + u32 id; + int events_reported; + + u64 uid; + u8 join_state; + struct list_head list; + struct sockaddr_storage addr; +}; + +struct ucma_event { + struct ucma_context *ctx; + struct ucma_context *conn_req_ctx; + struct ucma_multicast *mc; + struct list_head list; + struct rdma_ucm_event_resp resp; +}; + +static DEFINE_XARRAY_ALLOC(ctx_table); +static DEFINE_XARRAY_ALLOC(multicast_table); + +static const struct file_operations ucma_fops; +static int ucma_destroy_private_ctx(struct ucma_context *ctx); + +static inline struct ucma_context *_ucma_find_context(int id, + struct ucma_file *file) +{ + struct ucma_context *ctx; + + ctx = xa_load(&ctx_table, 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; + + xa_lock(&ctx_table); + ctx = _ucma_find_context(id, file); + if (!IS_ERR(ctx)) + if (!refcount_inc_not_zero(&ctx->ref)) + ctx = ERR_PTR(-ENXIO); + xa_unlock(&ctx_table); + return ctx; +} + +static void ucma_put_ctx(struct ucma_context *ctx) +{ + if (refcount_dec_and_test(&ctx->ref)) + complete(&ctx->comp); +} + +/* + * Same as ucm_get_ctx but requires that ->cm_id->device is valid, eg that the + * CM_ID is bound. + */ +static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id) +{ + struct ucma_context *ctx = ucma_get_ctx(file, id); + + if (IS_ERR(ctx)) + return ctx; + if (!ctx->cm_id->device) { + ucma_put_ctx(ctx); + return ERR_PTR(-EINVAL); + } + return ctx; +} + +static void ucma_close_id(struct work_struct *work) +{ + struct ucma_context *ctx = container_of(work, struct ucma_context, close_work); + + /* once all inflight tasks are finished, we close all underlying + * resources. The context is still alive till its explicit destryoing + * by its creator. This puts back the xarray's reference. + */ + ucma_put_ctx(ctx); + wait_for_completion(&ctx->comp); + /* No new events will be generated after destroying the id. */ + rdma_destroy_id(ctx->cm_id); + + /* Reading the cm_id without holding a positive ref is not allowed */ + ctx->cm_id = NULL; +} + +static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) +{ + struct ucma_context *ctx; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return NULL; + + INIT_WORK(&ctx->close_work, ucma_close_id); + init_completion(&ctx->comp); + INIT_LIST_HEAD(&ctx->mc_list); + /* So list_del() will work if we don't do ucma_finish_ctx() */ + INIT_LIST_HEAD(&ctx->list); + ctx->file = file; + mutex_init(&ctx->mutex); + + if (xa_alloc(&ctx_table, &ctx->id, NULL, xa_limit_32b, GFP_KERNEL)) { + kfree(ctx); + return NULL; + } + return ctx; +} + +static void ucma_set_ctx_cm_id(struct ucma_context *ctx, + struct rdma_cm_id *cm_id) +{ + refcount_set(&ctx->ref, 1); + ctx->cm_id = cm_id; +} + +static void ucma_finish_ctx(struct ucma_context *ctx) +{ + lockdep_assert_held(&ctx->file->mut); + list_add_tail(&ctx->list, &ctx->file->ctx_list); + xa_store(&ctx_table, ctx->id, ctx, GFP_KERNEL); +} + +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 ib_device *device, + 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(device, &dst->ah_attr, &src->ah_attr); + dst->qp_num = src->qp_num; + dst->qkey = src->qkey; +} + +static struct ucma_event *ucma_create_uevent(struct ucma_context *ctx, + struct rdma_cm_event *event) +{ + struct ucma_event *uevent; + + uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); + if (!uevent) + return NULL; + + 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; + } + uevent->resp.event = event->event; + uevent->resp.status = event->status; + if (ctx->cm_id->qp_type == IB_QPT_UD) + ucma_copy_ud_event(ctx->cm_id->device, &uevent->resp.param.ud, + &event->param.ud); + else + ucma_copy_conn_event(&uevent->resp.param.conn, + &event->param.conn); + + uevent->resp.ece.vendor_id = event->ece.vendor_id; + uevent->resp.ece.attr_mod = event->ece.attr_mod; + return uevent; +} + +static int ucma_connect_event_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct ucma_context *listen_ctx = cm_id->context; + struct ucma_context *ctx; + struct ucma_event *uevent; + + if (!atomic_add_unless(&listen_ctx->backlog, -1, 0)) + return -ENOMEM; + ctx = ucma_alloc_ctx(listen_ctx->file); + if (!ctx) + goto err_backlog; + ucma_set_ctx_cm_id(ctx, cm_id); + + uevent = ucma_create_uevent(listen_ctx, event); + if (!uevent) + goto err_alloc; + uevent->conn_req_ctx = ctx; + uevent->resp.id = ctx->id; + + ctx->cm_id->context = ctx; + + mutex_lock(&ctx->file->mut); + ucma_finish_ctx(ctx); + list_add_tail(&uevent->list, &ctx->file->event_list); + mutex_unlock(&ctx->file->mut); + wake_up_interruptible(&ctx->file->poll_wait); + return 0; + +err_alloc: + ucma_destroy_private_ctx(ctx); +err_backlog: + atomic_inc(&listen_ctx->backlog); + /* Returning error causes the new ID to be destroyed */ + return -ENOMEM; +} + +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; + + if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) + return ucma_connect_event_handler(cm_id, event); + + /* + * 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. However, we do need to release the underlying HW + * resources in case of a device removal event. + */ + if (ctx->uid) { + uevent = ucma_create_uevent(ctx, event); + if (!uevent) + return 0; + + mutex_lock(&ctx->file->mut); + list_add_tail(&uevent->list, &ctx->file->event_list); + mutex_unlock(&ctx->file->mut); + wake_up_interruptible(&ctx->file->poll_wait); + } + + if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { + xa_lock(&ctx_table); + if (xa_load(&ctx_table, ctx->id) == ctx) + queue_work(system_unbound_wq, &ctx->close_work); + xa_unlock(&ctx_table); + } + return 0; +} + +static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_get_event cmd; + struct ucma_event *uevent; + + /* + * Old 32 bit user space does not send the 4 byte padding in the + * reserved field. We don't care, allow it to keep working. + */ + if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) - + sizeof(uevent->resp.ece)) + 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_first_entry(&file->event_list, struct ucma_event, list); + + if (copy_to_user(u64_to_user_ptr(cmd.response), + &uevent->resp, + min_t(size_t, out_len, sizeof(uevent->resp)))) { + mutex_unlock(&file->mut); + return -EFAULT; + } + + list_del(&uevent->list); + uevent->ctx->events_reported++; + if (uevent->mc) + uevent->mc->events_reported++; + if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) + atomic_inc(&uevent->ctx->backlog); + mutex_unlock(&file->mut); + + kfree(uevent); + return 0; +} + +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; + struct rdma_cm_id *cm_id; + 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; + + ctx = ucma_alloc_ctx(file); + if (!ctx) + return -ENOMEM; + + ctx->uid = cmd.uid; + cm_id = rdma_create_user_id(ucma_event_handler, ctx, cmd.ps, qp_type); + if (IS_ERR(cm_id)) { + ret = PTR_ERR(cm_id); + goto err1; + } + ucma_set_ctx_cm_id(ctx, cm_id); + + resp.id = ctx->id; + if (copy_to_user(u64_to_user_ptr(cmd.response), + &resp, sizeof(resp))) { + ret = -EFAULT; + goto err1; + } + + mutex_lock(&file->mut); + ucma_finish_ctx(ctx); + mutex_unlock(&file->mut); + return 0; + +err1: + ucma_destroy_private_ctx(ctx); + return ret; +} + +static void ucma_cleanup_multicast(struct ucma_context *ctx) +{ + struct ucma_multicast *mc, *tmp; + + xa_lock(&multicast_table); + list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { + list_del(&mc->list); + /* + * At this point mc->ctx->ref is 0 so the mc cannot leave the + * lock on the reader and this is enough serialization + */ + __xa_erase(&multicast_table, mc->id); + kfree(mc); + } + xa_unlock(&multicast_table); +} + +static void ucma_cleanup_mc_events(struct ucma_multicast *mc) +{ + struct ucma_event *uevent, *tmp; + + rdma_lock_handler(mc->ctx->cm_id); + mutex_lock(&mc->ctx->file->mut); + list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { + if (uevent->mc != mc) + continue; + + list_del(&uevent->list); + kfree(uevent); + } + mutex_unlock(&mc->ctx->file->mut); + rdma_unlock_handler(mc->ctx->cm_id); +} + +static int ucma_cleanup_ctx_events(struct ucma_context *ctx) +{ + int events_reported; + struct ucma_event *uevent, *tmp; + LIST_HEAD(list); + + /* 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) + continue; + + if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST && + xa_cmpxchg(&ctx_table, uevent->conn_req_ctx->id, + uevent->conn_req_ctx, XA_ZERO_ENTRY, + GFP_KERNEL) == uevent->conn_req_ctx) { + list_move_tail(&uevent->list, &list); + continue; + } + list_del(&uevent->list); + kfree(uevent); + } + list_del(&ctx->list); + events_reported = ctx->events_reported; + mutex_unlock(&ctx->file->mut); + + /* + * If this was a listening ID then any connections spawned from it that + * have not been delivered to userspace are cleaned up too. Must be done + * outside any locks. + */ + list_for_each_entry_safe(uevent, tmp, &list, list) { + ucma_destroy_private_ctx(uevent->conn_req_ctx); + kfree(uevent); + } + return events_reported; +} + +/* + * When this is called the xarray must have a XA_ZERO_ENTRY in the ctx->id (ie + * the ctx is not public to the user). This either because: + * - ucma_finish_ctx() hasn't been called + * - xa_cmpxchg() succeed to remove the entry (only one thread can succeed) + */ +static int ucma_destroy_private_ctx(struct ucma_context *ctx) +{ + int events_reported; + + /* + * Destroy the underlying cm_id. New work queuing is prevented now by + * the removal from the xarray. Once the work is cancled ref will either + * be 0 because the work ran to completion and consumed the ref from the + * xarray, or it will be positive because we still have the ref from the + * xarray. This can also be 0 in cases where cm_id was never set + */ + cancel_work_sync(&ctx->close_work); + if (refcount_read(&ctx->ref)) + ucma_close_id(&ctx->close_work); + + events_reported = ucma_cleanup_ctx_events(ctx); + ucma_cleanup_multicast(ctx); + + WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, XA_ZERO_ENTRY, NULL, + GFP_KERNEL) != NULL); + mutex_destroy(&ctx->mutex); + 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; + + xa_lock(&ctx_table); + ctx = _ucma_find_context(cmd.id, file); + if (!IS_ERR(ctx)) { + if (__xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY, + GFP_KERNEL) != ctx) + ctx = ERR_PTR(-ENOENT); + } + xa_unlock(&ctx_table); + + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + resp.events_reported = ucma_destroy_private_ctx(ctx); + if (copy_to_user(u64_to_user_ptr(cmd.response), + &resp, sizeof(resp))) + ret = -EFAULT; + + return ret; +} + +static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_bind_ip cmd; + struct ucma_context *ctx; + int ret; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + if (!rdma_addr_size_in6(&cmd.addr)) + return -EINVAL; + + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); + mutex_unlock(&ctx->mutex); + + ucma_put_ctx(ctx); + return ret; +} + +static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_bind cmd; + struct ucma_context *ctx; + int ret; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + if (cmd.reserved || !cmd.addr_size || + cmd.addr_size != rdma_addr_size_kss(&cmd.addr)) + return -EINVAL; + + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); + mutex_unlock(&ctx->mutex); + ucma_put_ctx(ctx); + return ret; +} + +static ssize_t ucma_resolve_ip(struct ucma_file *file, + const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_resolve_ip cmd; + struct ucma_context *ctx; + int ret; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) || + !rdma_addr_size_in6(&cmd.dst_addr)) + return -EINVAL; + + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, + (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms); + mutex_unlock(&ctx->mutex); + 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; + + if (cmd.reserved || + (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) || + !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr))) + return -EINVAL; + + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, + (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms); + mutex_unlock(&ctx->mutex); + 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_dev(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); + mutex_unlock(&ctx->mutex); + 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_pri_alt_paths; + switch (route->num_pri_alt_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]); + fallthrough; + 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) +{ + + resp->num_paths = route->num_pri_alt_paths; + switch (route->num_pri_alt_paths) { + case 0: + rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr, + (union ib_gid *)&resp->ib_route[0].dgid); + rdma_ip2gid((struct sockaddr *)&route->addr.src_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]); + fallthrough; + 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 cmd; + struct rdma_ucm_query_route_resp resp; + struct ucma_context *ctx; + struct sockaddr *addr; + int ret = 0; + + if (out_len < offsetof(struct rdma_ucm_query_route_resp, ibdev_index)) + 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(&ctx->mutex); + 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.ibdev_index = ctx->cm_id->device->index; + resp.port_num = ctx->cm_id->port_num; + + if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num)) + ucma_copy_ib_route(&resp, &ctx->cm_id->route); + else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num)) + ucma_copy_iboe_route(&resp, &ctx->cm_id->route); + else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num)) + ucma_copy_iw_route(&resp, &ctx->cm_id->route); + +out: + mutex_unlock(&ctx->mutex); + if (copy_to_user(u64_to_user_ptr(cmd.response), &resp, + min_t(size_t, out_len, sizeof(resp)))) + ret = -EFAULT; + + ucma_put_ctx(ctx); + return ret; +} + +static void ucma_query_device_addr(struct rdma_cm_id *cm_id, + struct rdma_ucm_query_addr_resp *resp) +{ + if (!cm_id->device) + return; + + resp->node_guid = (__force __u64) cm_id->device->node_guid; + resp->ibdev_index = cm_id->device->index; + resp->port_num = cm_id->port_num; + resp->pkey = (__force __u16) cpu_to_be16( + ib_addr_get_pkey(&cm_id->route.addr.dev_addr)); +} + +static ssize_t ucma_query_addr(struct ucma_context *ctx, + void __user *response, int out_len) +{ + struct rdma_ucm_query_addr_resp resp; + struct sockaddr *addr; + int ret = 0; + + if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index)) + return -ENOSPC; + + memset(&resp, 0, sizeof resp); + + addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; + resp.src_size = rdma_addr_size(addr); + memcpy(&resp.src_addr, addr, resp.src_size); + + addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; + resp.dst_size = rdma_addr_size(addr); + memcpy(&resp.dst_addr, addr, resp.dst_size); + + ucma_query_device_addr(ctx->cm_id, &resp); + + if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp)))) + ret = -EFAULT; + + return ret; +} + +static ssize_t ucma_query_path(struct ucma_context *ctx, + void __user *response, int out_len) +{ + struct rdma_ucm_query_path_resp *resp; + int i, ret = 0; + + if (out_len < sizeof(*resp)) + return -ENOSPC; + + resp = kzalloc(out_len, GFP_KERNEL); + if (!resp) + return -ENOMEM; + + resp->num_paths = ctx->cm_id->route.num_pri_alt_paths; + for (i = 0, out_len -= sizeof(*resp); + i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data); + i++, out_len -= sizeof(struct ib_path_rec_data)) { + struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i]; + + resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY | + IB_PATH_BIDIRECTIONAL; + if (rec->rec_type == SA_PATH_REC_TYPE_OPA) { + struct sa_path_rec ib; + + sa_convert_path_opa_to_ib(&ib, rec); + ib_sa_pack_path(&ib, &resp->path_data[i].path_rec); + + } else { + ib_sa_pack_path(rec, &resp->path_data[i].path_rec); + } + } + + if (copy_to_user(response, resp, struct_size(resp, path_data, i))) + ret = -EFAULT; + + kfree(resp); + return ret; +} + +static ssize_t ucma_query_gid(struct ucma_context *ctx, + void __user *response, int out_len) +{ + struct rdma_ucm_query_addr_resp resp; + struct sockaddr_ib *addr; + int ret = 0; + + if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index)) + return -ENOSPC; + + memset(&resp, 0, sizeof resp); + + ucma_query_device_addr(ctx->cm_id, &resp); + + addr = (struct sockaddr_ib *) &resp.src_addr; + resp.src_size = sizeof(*addr); + if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) { + memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size); + } else { + addr->sib_family = AF_IB; + addr->sib_pkey = (__force __be16) resp.pkey; + rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr, + NULL); + addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *) + &ctx->cm_id->route.addr.src_addr); + } + + addr = (struct sockaddr_ib *) &resp.dst_addr; + resp.dst_size = sizeof(*addr); + if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) { + memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size); + } else { + addr->sib_family = AF_IB; + addr->sib_pkey = (__force __be16) resp.pkey; + rdma_read_gids(ctx->cm_id, NULL, + (union ib_gid *)&addr->sib_addr); + addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *) + &ctx->cm_id->route.addr.dst_addr); + } + + if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp)))) + ret = -EFAULT; + + return ret; +} + +static ssize_t ucma_query(struct ucma_file *file, + const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_query cmd; + struct ucma_context *ctx; + void __user *response; + int ret; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + response = u64_to_user_ptr(cmd.response); + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + switch (cmd.option) { + case RDMA_USER_CM_QUERY_ADDR: + ret = ucma_query_addr(ctx, response, out_len); + break; + case RDMA_USER_CM_QUERY_PATH: + ret = ucma_query_path(ctx, response, out_len); + break; + case RDMA_USER_CM_QUERY_GID: + ret = ucma_query_gid(ctx, response, out_len); + break; + default: + ret = -ENOSYS; + break; + } + mutex_unlock(&ctx->mutex); + + ucma_put_ctx(ctx); + return ret; +} + +static void ucma_copy_conn_param(struct rdma_cm_id *id, + 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 & 0xFFFFFF; + dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0; +} + +static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_conn_param conn_param; + struct rdma_ucm_ece ece = {}; + struct rdma_ucm_connect cmd; + struct ucma_context *ctx; + size_t in_size; + int ret; + + if (in_len < offsetofend(typeof(cmd), reserved)) + return -EINVAL; + in_size = min_t(size_t, in_len, sizeof(cmd)); + if (copy_from_user(&cmd, inbuf, in_size)) + return -EFAULT; + + if (!cmd.conn_param.valid) + return -EINVAL; + + ctx = ucma_get_ctx_dev(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param); + if (offsetofend(typeof(cmd), ece) <= in_size) { + ece.vendor_id = cmd.ece.vendor_id; + ece.attr_mod = cmd.ece.attr_mod; + } + + mutex_lock(&ctx->mutex); + ret = rdma_connect_ece(ctx->cm_id, &conn_param, &ece); + mutex_unlock(&ctx->mutex); + 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); + + if (cmd.backlog <= 0 || cmd.backlog > max_backlog) + cmd.backlog = max_backlog; + atomic_set(&ctx->backlog, cmd.backlog); + + mutex_lock(&ctx->mutex); + ret = rdma_listen(ctx->cm_id, cmd.backlog); + mutex_unlock(&ctx->mutex); + 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 rdma_ucm_ece ece = {}; + struct ucma_context *ctx; + size_t in_size; + int ret; + + if (in_len < offsetofend(typeof(cmd), reserved)) + return -EINVAL; + in_size = min_t(size_t, in_len, sizeof(cmd)); + if (copy_from_user(&cmd, inbuf, in_size)) + return -EFAULT; + + ctx = ucma_get_ctx_dev(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + if (offsetofend(typeof(cmd), ece) <= in_size) { + ece.vendor_id = cmd.ece.vendor_id; + ece.attr_mod = cmd.ece.attr_mod; + } + + if (cmd.conn_param.valid) { + ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param); + mutex_lock(&ctx->mutex); + rdma_lock_handler(ctx->cm_id); + ret = rdma_accept_ece(ctx->cm_id, &conn_param, &ece); + if (!ret) { + /* The uid must be set atomically with the handler */ + ctx->uid = cmd.uid; + } + rdma_unlock_handler(ctx->cm_id); + mutex_unlock(&ctx->mutex); + } else { + mutex_lock(&ctx->mutex); + rdma_lock_handler(ctx->cm_id); + ret = rdma_accept_ece(ctx->cm_id, NULL, &ece); + rdma_unlock_handler(ctx->cm_id); + mutex_unlock(&ctx->mutex); + } + 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; + + if (!cmd.reason) + cmd.reason = IB_CM_REJ_CONSUMER_DEFINED; + + switch (cmd.reason) { + case IB_CM_REJ_CONSUMER_DEFINED: + case IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED: + break; + default: + return -EINVAL; + } + + ctx = ucma_get_ctx_dev(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len, + cmd.reason); + mutex_unlock(&ctx->mutex); + 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_dev(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mutex_lock(&ctx->mutex); + ret = rdma_disconnect(ctx->cm_id); + mutex_unlock(&ctx->mutex); + 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; + + if (cmd.qp_state > IB_QPS_ERR) + return -EINVAL; + + ctx = ucma_get_ctx_dev(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; + mutex_lock(&ctx->mutex); + ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); + mutex_unlock(&ctx->mutex); + if (ret) + goto out; + + ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr); + if (copy_to_user(u64_to_user_ptr(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; + case RDMA_OPTION_ID_AFONLY: + if (optlen != sizeof(int)) { + ret = -EINVAL; + break; + } + ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0); + break; + case RDMA_OPTION_ID_ACK_TIMEOUT: + if (optlen != sizeof(u8)) { + ret = -EINVAL; + break; + } + ret = rdma_set_ack_timeout(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 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; + + if (!ctx->cm_id->device) + return -EINVAL; + + memset(&sa_path, 0, sizeof(sa_path)); + + sa_path.rec_type = SA_PATH_REC_TYPE_IB; + ib_sa_unpack_path(path_data->path_rec, &sa_path); + + if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) { + struct sa_path_rec opa; + + sa_convert_path_ib_to_opa(&opa, &sa_path); + mutex_lock(&ctx->mutex); + ret = rdma_set_ib_path(ctx->cm_id, &opa); + mutex_unlock(&ctx->mutex); + } else { + mutex_lock(&ctx->mutex); + ret = rdma_set_ib_path(ctx->cm_id, &sa_path); + mutex_unlock(&ctx->mutex); + } + 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: + mutex_lock(&ctx->mutex); + ret = ucma_set_option_id(ctx, optname, optval, optlen); + mutex_unlock(&ctx->mutex); + 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; + + if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE)) + return -EINVAL; + + ctx = ucma_get_ctx(file, cmd.id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + optval = memdup_user(u64_to_user_ptr(cmd.optval), + cmd.optlen); + if (IS_ERR(optval)) { + ret = PTR_ERR(optval); + goto out; + } + + ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, + cmd.optlen); + kfree(optval); + +out: + 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 = -EINVAL; + + 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(&ctx->mutex); + if (ctx->cm_id->device) + ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event); + mutex_unlock(&ctx->mutex); + + ucma_put_ctx(ctx); + return ret; +} + +static ssize_t ucma_process_join(struct ucma_file *file, + struct rdma_ucm_join_mcast *cmd, int out_len) +{ + struct rdma_ucm_create_id_resp resp; + struct ucma_context *ctx; + struct ucma_multicast *mc; + struct sockaddr *addr; + int ret; + u8 join_state; + + if (out_len < sizeof(resp)) + return -ENOSPC; + + addr = (struct sockaddr *) &cmd->addr; + if (cmd->addr_size != rdma_addr_size(addr)) + return -EINVAL; + + if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER) + join_state = BIT(FULLMEMBER_JOIN); + else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER) + join_state = BIT(SENDONLY_FULLMEMBER_JOIN); + else + return -EINVAL; + + ctx = ucma_get_ctx_dev(file, cmd->id); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + mc = kzalloc(sizeof(*mc), GFP_KERNEL); + if (!mc) { + ret = -ENOMEM; + goto err_put_ctx; + } + + mc->ctx = ctx; + mc->join_state = join_state; + mc->uid = cmd->uid; + memcpy(&mc->addr, addr, cmd->addr_size); + + xa_lock(&multicast_table); + if (__xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b, + GFP_KERNEL)) { + ret = -ENOMEM; + goto err_free_mc; + } + + list_add_tail(&mc->list, &ctx->mc_list); + xa_unlock(&multicast_table); + + mutex_lock(&ctx->mutex); + ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr, + join_state, mc); + mutex_unlock(&ctx->mutex); + if (ret) + goto err_xa_erase; + + resp.id = mc->id; + if (copy_to_user(u64_to_user_ptr(cmd->response), + &resp, sizeof(resp))) { + ret = -EFAULT; + goto err_leave_multicast; + } + + xa_store(&multicast_table, mc->id, mc, 0); + + ucma_put_ctx(ctx); + return 0; + +err_leave_multicast: + mutex_lock(&ctx->mutex); + rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); + mutex_unlock(&ctx->mutex); + ucma_cleanup_mc_events(mc); +err_xa_erase: + xa_lock(&multicast_table); + list_del(&mc->list); + __xa_erase(&multicast_table, mc->id); +err_free_mc: + xa_unlock(&multicast_table); + kfree(mc); +err_put_ctx: + ucma_put_ctx(ctx); + return ret; +} + +static ssize_t ucma_join_ip_multicast(struct ucma_file *file, + const char __user *inbuf, + int in_len, int out_len) +{ + struct rdma_ucm_join_ip_mcast cmd; + struct rdma_ucm_join_mcast join_cmd; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + join_cmd.response = cmd.response; + join_cmd.uid = cmd.uid; + join_cmd.id = cmd.id; + join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr); + if (!join_cmd.addr_size) + return -EINVAL; + + join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER; + memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size); + + return ucma_process_join(file, &join_cmd, out_len); +} + +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; + + if (copy_from_user(&cmd, inbuf, sizeof(cmd))) + return -EFAULT; + + if (!rdma_addr_size_kss(&cmd.addr)) + return -EINVAL; + + return ucma_process_join(file, &cmd, out_len); +} + +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; + + xa_lock(&multicast_table); + mc = xa_load(&multicast_table, cmd.id); + if (!mc) + mc = ERR_PTR(-ENOENT); + else if (READ_ONCE(mc->ctx->file) != file) + mc = ERR_PTR(-EINVAL); + else if (!refcount_inc_not_zero(&mc->ctx->ref)) + mc = ERR_PTR(-ENXIO); + + if (IS_ERR(mc)) { + xa_unlock(&multicast_table); + ret = PTR_ERR(mc); + goto out; + } + + list_del(&mc->list); + __xa_erase(&multicast_table, mc->id); + xa_unlock(&multicast_table); + + mutex_lock(&mc->ctx->mutex); + rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); + mutex_unlock(&mc->ctx->mutex); + + ucma_cleanup_mc_events(mc); + + ucma_put_ctx(mc->ctx); + resp.events_reported = mc->events_reported; + kfree(mc); + + if (copy_to_user(u64_to_user_ptr(cmd.response), + &resp, sizeof(resp))) + ret = -EFAULT; +out: + return ret; +} + +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_event *uevent, *tmp; + struct ucma_context *ctx; + LIST_HEAD(event_list); + struct fd f; + 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 */ + f = fdget(cmd.fd); + if (!f.file) + return -ENOENT; + if (f.file->f_op != &ucma_fops) { + ret = -EINVAL; + goto file_put; + } + cur_file = f.file->private_data; + + /* Validate current fd and prevent destruction of id. */ + ctx = ucma_get_ctx(cur_file, cmd.id); + if (IS_ERR(ctx)) { + ret = PTR_ERR(ctx); + goto file_put; + } + + rdma_lock_handler(ctx->cm_id); + /* + * ctx->file can only be changed under the handler & xa_lock. xa_load() + * must be checked again to ensure the ctx hasn't begun destruction + * since the ucma_get_ctx(). + */ + xa_lock(&ctx_table); + if (_ucma_find_context(cmd.id, cur_file) != ctx) { + xa_unlock(&ctx_table); + ret = -ENOENT; + goto err_unlock; + } + ctx->file = new_file; + xa_unlock(&ctx_table); + + mutex_lock(&cur_file->mut); + list_del(&ctx->list); + /* + * At this point lock_handler() prevents addition of new uevents for + * this ctx. + */ + list_for_each_entry_safe(uevent, tmp, &cur_file->event_list, list) + if (uevent->ctx == ctx) + list_move_tail(&uevent->list, &event_list); + resp.events_reported = ctx->events_reported; + mutex_unlock(&cur_file->mut); + + mutex_lock(&new_file->mut); + list_add_tail(&ctx->list, &new_file->ctx_list); + list_splice_tail(&event_list, &new_file->event_list); + mutex_unlock(&new_file->mut); + + if (copy_to_user(u64_to_user_ptr(cmd.response), + &resp, sizeof(resp))) + ret = -EFAULT; + +err_unlock: + rdma_unlock_handler(ctx->cm_id); + ucma_put_ctx(ctx); +file_put: + fdput(f); + 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_IP] = ucma_bind_ip, + [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip, + [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_IP_MCAST] = ucma_join_ip_multicast, + [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, + [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id, + [RDMA_USER_CM_CMD_QUERY] = ucma_query, + [RDMA_USER_CM_CMD_BIND] = ucma_bind, + [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, + [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast +}; + +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 (!ib_safe_file_access(filp)) { + pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", + __func__, task_tgid_vnr(current), current->comm); + return -EACCES; + } + + 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; + hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table)); + + 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 __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait) +{ + struct ucma_file *file = filp->private_data; + __poll_t mask = 0; + + poll_wait(filp, &file->poll_wait, wait); + + if (!list_empty(&file->event_list)) + mask = EPOLLIN | EPOLLRDNORM; + + 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 stream_open(inode, filp); +} + +static int ucma_close(struct inode *inode, struct file *filp) +{ + struct ucma_file *file = filp->private_data; + + /* + * All paths that touch ctx_list or ctx_list starting from write() are + * prevented by this being a FD release function. The list_add_tail() in + * ucma_connect_event_handler() can run concurrently, however it only + * adds to the list *after* a listening ID. By only reading the first of + * the list, and relying on ucma_destroy_private_ctx() to block + * ucma_connect_event_handler(), no additional locking is needed. + */ + while (!list_empty(&file->ctx_list)) { + struct ucma_context *ctx = list_first_entry( + &file->ctx_list, struct ucma_context, list); + + WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY, + GFP_KERNEL) != ctx); + ucma_destroy_private_ctx(ctx); + } + 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 int ucma_get_global_nl_info(struct ib_client_nl_info *res) +{ + res->abi = RDMA_USER_CM_ABI_VERSION; + res->cdev = ucma_misc.this_device; + return 0; +} + +static struct ib_client rdma_cma_client = { + .name = "rdma_cm", + .get_global_nl_info = ucma_get_global_nl_info, +}; +MODULE_ALIAS_RDMA_CLIENT("rdma_cm"); + +static ssize_t abi_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); +} +static DEVICE_ATTR_RO(abi_version); + +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) { + pr_err("rdma_ucm: couldn't create abi_version attr\n"); + goto err1; + } + + ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table); + if (!ucma_ctl_table_hdr) { + pr_err("rdma_ucm: couldn't register sysctl paths\n"); + ret = -ENOMEM; + goto err2; + } + + ret = ib_register_client(&rdma_cma_client); + if (ret) + goto err3; + + return 0; +err3: + unregister_net_sysctl_table(ucma_ctl_table_hdr); +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) +{ + ib_unregister_client(&rdma_cma_client); + unregister_net_sysctl_table(ucma_ctl_table_hdr); + device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); + misc_deregister(&ucma_misc); +} + +module_init(ucma_init); +module_exit(ucma_cleanup); |