![Tom Tucker](/assets/img/avatar_default.png)
Modifications to the existing rdma header files, core files, drivers, and ulp files to support iWARP, including: - Hook iWARP CM into the build system and use it in rdma_cm. - Convert enum ib_node_type to enum rdma_node_type, which includes the possibility of RDMA_NODE_RNIC, and update everything for this. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
1139 lines
28 KiB
C
1139 lines
28 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* $Id: user_mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/poll.h>
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#include <linux/rwsem.h>
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#include <linux/kref.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <rdma/ib_mad.h>
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#include <rdma/ib_user_mad.h>
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MODULE_AUTHOR("Roland Dreier");
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MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
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MODULE_LICENSE("Dual BSD/GPL");
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enum {
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IB_UMAD_MAX_PORTS = 64,
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IB_UMAD_MAX_AGENTS = 32,
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IB_UMAD_MAJOR = 231,
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IB_UMAD_MINOR_BASE = 0
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};
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/*
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* Our lifetime rules for these structs are the following: each time a
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* device special file is opened, we look up the corresponding struct
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* ib_umad_port by minor in the umad_port[] table while holding the
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* port_lock. If this lookup succeeds, we take a reference on the
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* ib_umad_port's struct ib_umad_device while still holding the
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* port_lock; if the lookup fails, we fail the open(). We drop these
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* references in the corresponding close().
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*
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* In addition to references coming from open character devices, there
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* is one more reference to each ib_umad_device representing the
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* module's reference taken when allocating the ib_umad_device in
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* ib_umad_add_one().
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*
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* When destroying an ib_umad_device, we clear all of its
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* ib_umad_ports from umad_port[] while holding port_lock before
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* dropping the module's reference to the ib_umad_device. This is
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* always safe because any open() calls will either succeed and obtain
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* a reference before we clear the umad_port[] entries, or fail after
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* we clear the umad_port[] entries.
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*/
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struct ib_umad_port {
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struct cdev *dev;
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struct class_device *class_dev;
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struct cdev *sm_dev;
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struct class_device *sm_class_dev;
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struct semaphore sm_sem;
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struct rw_semaphore mutex;
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struct list_head file_list;
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struct ib_device *ib_dev;
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struct ib_umad_device *umad_dev;
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int dev_num;
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u8 port_num;
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};
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struct ib_umad_device {
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int start_port, end_port;
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struct kref ref;
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struct ib_umad_port port[0];
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};
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struct ib_umad_file {
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struct ib_umad_port *port;
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struct list_head recv_list;
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struct list_head send_list;
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struct list_head port_list;
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spinlock_t recv_lock;
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spinlock_t send_lock;
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wait_queue_head_t recv_wait;
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struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
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int agents_dead;
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};
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struct ib_umad_packet {
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struct ib_mad_send_buf *msg;
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struct ib_mad_recv_wc *recv_wc;
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struct list_head list;
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int length;
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struct ib_user_mad mad;
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};
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static struct class *umad_class;
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static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
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static DEFINE_SPINLOCK(port_lock);
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static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
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static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
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static void ib_umad_add_one(struct ib_device *device);
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static void ib_umad_remove_one(struct ib_device *device);
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static void ib_umad_release_dev(struct kref *ref)
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{
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struct ib_umad_device *dev =
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container_of(ref, struct ib_umad_device, ref);
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kfree(dev);
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}
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/* caller must hold port->mutex at least for reading */
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static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
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{
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return file->agents_dead ? NULL : file->agent[id];
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}
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static int queue_packet(struct ib_umad_file *file,
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struct ib_mad_agent *agent,
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struct ib_umad_packet *packet)
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{
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int ret = 1;
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down_read(&file->port->mutex);
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for (packet->mad.hdr.id = 0;
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packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
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packet->mad.hdr.id++)
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if (agent == __get_agent(file, packet->mad.hdr.id)) {
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spin_lock_irq(&file->recv_lock);
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list_add_tail(&packet->list, &file->recv_list);
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spin_unlock_irq(&file->recv_lock);
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wake_up_interruptible(&file->recv_wait);
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ret = 0;
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break;
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}
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up_read(&file->port->mutex);
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return ret;
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}
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static void dequeue_send(struct ib_umad_file *file,
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struct ib_umad_packet *packet)
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{
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spin_lock_irq(&file->send_lock);
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list_del(&packet->list);
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spin_unlock_irq(&file->send_lock);
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}
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static void send_handler(struct ib_mad_agent *agent,
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struct ib_mad_send_wc *send_wc)
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{
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struct ib_umad_file *file = agent->context;
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struct ib_umad_packet *packet = send_wc->send_buf->context[0];
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dequeue_send(file, packet);
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ib_destroy_ah(packet->msg->ah);
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ib_free_send_mad(packet->msg);
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if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
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packet->length = IB_MGMT_MAD_HDR;
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packet->mad.hdr.status = ETIMEDOUT;
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if (!queue_packet(file, agent, packet))
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return;
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}
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kfree(packet);
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}
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static void recv_handler(struct ib_mad_agent *agent,
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struct ib_mad_recv_wc *mad_recv_wc)
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{
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struct ib_umad_file *file = agent->context;
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struct ib_umad_packet *packet;
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if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
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goto err1;
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packet = kzalloc(sizeof *packet, GFP_KERNEL);
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if (!packet)
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goto err1;
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packet->length = mad_recv_wc->mad_len;
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packet->recv_wc = mad_recv_wc;
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packet->mad.hdr.status = 0;
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packet->mad.hdr.length = sizeof (struct ib_user_mad) +
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mad_recv_wc->mad_len;
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packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
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packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
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packet->mad.hdr.sl = mad_recv_wc->wc->sl;
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packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
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packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
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if (packet->mad.hdr.grh_present) {
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/* XXX parse GRH */
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packet->mad.hdr.gid_index = 0;
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packet->mad.hdr.hop_limit = 0;
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packet->mad.hdr.traffic_class = 0;
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memset(packet->mad.hdr.gid, 0, 16);
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packet->mad.hdr.flow_label = 0;
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}
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if (queue_packet(file, agent, packet))
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goto err2;
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return;
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err2:
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kfree(packet);
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err1:
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ib_free_recv_mad(mad_recv_wc);
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}
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static ssize_t copy_recv_mad(char __user *buf, struct ib_umad_packet *packet,
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size_t count)
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{
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struct ib_mad_recv_buf *recv_buf;
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int left, seg_payload, offset, max_seg_payload;
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/* We need enough room to copy the first (or only) MAD segment. */
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recv_buf = &packet->recv_wc->recv_buf;
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if ((packet->length <= sizeof (*recv_buf->mad) &&
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count < sizeof (packet->mad) + packet->length) ||
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(packet->length > sizeof (*recv_buf->mad) &&
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count < sizeof (packet->mad) + sizeof (*recv_buf->mad)))
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return -EINVAL;
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if (copy_to_user(buf, &packet->mad, sizeof (packet->mad)))
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return -EFAULT;
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buf += sizeof (packet->mad);
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seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
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if (copy_to_user(buf, recv_buf->mad, seg_payload))
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return -EFAULT;
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if (seg_payload < packet->length) {
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/*
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* Multipacket RMPP MAD message. Copy remainder of message.
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* Note that last segment may have a shorter payload.
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*/
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if (count < sizeof (packet->mad) + packet->length) {
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/*
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* The buffer is too small, return the first RMPP segment,
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* which includes the RMPP message length.
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*/
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return -ENOSPC;
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}
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offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
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max_seg_payload = sizeof (struct ib_mad) - offset;
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for (left = packet->length - seg_payload, buf += seg_payload;
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left; left -= seg_payload, buf += seg_payload) {
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recv_buf = container_of(recv_buf->list.next,
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struct ib_mad_recv_buf, list);
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seg_payload = min(left, max_seg_payload);
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if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
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seg_payload))
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return -EFAULT;
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}
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}
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return sizeof (packet->mad) + packet->length;
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}
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static ssize_t copy_send_mad(char __user *buf, struct ib_umad_packet *packet,
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size_t count)
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{
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ssize_t size = sizeof (packet->mad) + packet->length;
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if (count < size)
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return -EINVAL;
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if (copy_to_user(buf, &packet->mad, size))
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return -EFAULT;
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return size;
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}
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static ssize_t ib_umad_read(struct file *filp, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct ib_umad_file *file = filp->private_data;
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struct ib_umad_packet *packet;
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ssize_t ret;
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if (count < sizeof (struct ib_user_mad))
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return -EINVAL;
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spin_lock_irq(&file->recv_lock);
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while (list_empty(&file->recv_list)) {
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spin_unlock_irq(&file->recv_lock);
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if (filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible(file->recv_wait,
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!list_empty(&file->recv_list)))
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return -ERESTARTSYS;
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spin_lock_irq(&file->recv_lock);
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}
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packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
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list_del(&packet->list);
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spin_unlock_irq(&file->recv_lock);
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if (packet->recv_wc)
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ret = copy_recv_mad(buf, packet, count);
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else
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ret = copy_send_mad(buf, packet, count);
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if (ret < 0) {
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/* Requeue packet */
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spin_lock_irq(&file->recv_lock);
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list_add(&packet->list, &file->recv_list);
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spin_unlock_irq(&file->recv_lock);
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} else {
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if (packet->recv_wc)
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ib_free_recv_mad(packet->recv_wc);
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kfree(packet);
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}
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return ret;
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}
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static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
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{
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int left, seg;
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/* Copy class specific header */
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if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
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copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
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msg->hdr_len - IB_MGMT_RMPP_HDR))
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return -EFAULT;
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/* All headers are in place. Copy data segments. */
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for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
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seg++, left -= msg->seg_size, buf += msg->seg_size) {
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if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
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min(left, msg->seg_size)))
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return -EFAULT;
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}
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return 0;
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}
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static int same_destination(struct ib_user_mad_hdr *hdr1,
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struct ib_user_mad_hdr *hdr2)
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{
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if (!hdr1->grh_present && !hdr2->grh_present)
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return (hdr1->lid == hdr2->lid);
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if (hdr1->grh_present && hdr2->grh_present)
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return !memcmp(hdr1->gid, hdr2->gid, 16);
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return 0;
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}
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static int is_duplicate(struct ib_umad_file *file,
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struct ib_umad_packet *packet)
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{
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struct ib_umad_packet *sent_packet;
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struct ib_mad_hdr *sent_hdr, *hdr;
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hdr = (struct ib_mad_hdr *) packet->mad.data;
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list_for_each_entry(sent_packet, &file->send_list, list) {
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sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
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if ((hdr->tid != sent_hdr->tid) ||
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(hdr->mgmt_class != sent_hdr->mgmt_class))
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continue;
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/*
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* No need to be overly clever here. If two new operations have
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* the same TID, reject the second as a duplicate. This is more
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* restrictive than required by the spec.
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*/
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if (!ib_response_mad((struct ib_mad *) hdr)) {
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if (!ib_response_mad((struct ib_mad *) sent_hdr))
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return 1;
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continue;
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} else if (!ib_response_mad((struct ib_mad *) sent_hdr))
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continue;
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if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
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return 1;
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}
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return 0;
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}
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static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *pos)
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{
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struct ib_umad_file *file = filp->private_data;
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struct ib_umad_packet *packet;
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struct ib_mad_agent *agent;
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struct ib_ah_attr ah_attr;
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struct ib_ah *ah;
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struct ib_rmpp_mad *rmpp_mad;
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__be64 *tid;
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int ret, data_len, hdr_len, copy_offset, rmpp_active;
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if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)
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return -EINVAL;
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packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
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if (!packet)
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return -ENOMEM;
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|
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if (copy_from_user(&packet->mad, buf,
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sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) {
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ret = -EFAULT;
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goto err;
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}
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if (packet->mad.hdr.id < 0 ||
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packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
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ret = -EINVAL;
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goto err;
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}
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down_read(&file->port->mutex);
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agent = __get_agent(file, packet->mad.hdr.id);
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if (!agent) {
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ret = -EINVAL;
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goto err_up;
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}
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memset(&ah_attr, 0, sizeof ah_attr);
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ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
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ah_attr.sl = packet->mad.hdr.sl;
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ah_attr.src_path_bits = packet->mad.hdr.path_bits;
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ah_attr.port_num = file->port->port_num;
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if (packet->mad.hdr.grh_present) {
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ah_attr.ah_flags = IB_AH_GRH;
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memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
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ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
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ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
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ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
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}
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ah = ib_create_ah(agent->qp->pd, &ah_attr);
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if (IS_ERR(ah)) {
|
|
ret = PTR_ERR(ah);
|
|
goto err_up;
|
|
}
|
|
|
|
rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
|
|
hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
|
|
if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
|
|
copy_offset = IB_MGMT_MAD_HDR;
|
|
rmpp_active = 0;
|
|
} else {
|
|
copy_offset = IB_MGMT_RMPP_HDR;
|
|
rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
|
|
IB_MGMT_RMPP_FLAG_ACTIVE;
|
|
}
|
|
|
|
data_len = count - sizeof (struct ib_user_mad) - hdr_len;
|
|
packet->msg = ib_create_send_mad(agent,
|
|
be32_to_cpu(packet->mad.hdr.qpn),
|
|
0, rmpp_active, hdr_len,
|
|
data_len, GFP_KERNEL);
|
|
if (IS_ERR(packet->msg)) {
|
|
ret = PTR_ERR(packet->msg);
|
|
goto err_ah;
|
|
}
|
|
|
|
packet->msg->ah = ah;
|
|
packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
|
|
packet->msg->retries = packet->mad.hdr.retries;
|
|
packet->msg->context[0] = packet;
|
|
|
|
/* Copy MAD header. Any RMPP header is already in place. */
|
|
memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
|
|
buf += sizeof (struct ib_user_mad);
|
|
|
|
if (!rmpp_active) {
|
|
if (copy_from_user(packet->msg->mad + copy_offset,
|
|
buf + copy_offset,
|
|
hdr_len + data_len - copy_offset)) {
|
|
ret = -EFAULT;
|
|
goto err_msg;
|
|
}
|
|
} else {
|
|
ret = copy_rmpp_mad(packet->msg, buf);
|
|
if (ret)
|
|
goto err_msg;
|
|
}
|
|
|
|
/*
|
|
* Set the high-order part of the transaction ID to make MADs from
|
|
* different agents unique, and allow routing responses back to the
|
|
* original requestor.
|
|
*/
|
|
if (!ib_response_mad(packet->msg->mad)) {
|
|
tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
|
|
*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
|
|
(be64_to_cpup(tid) & 0xffffffff));
|
|
rmpp_mad->mad_hdr.tid = *tid;
|
|
}
|
|
|
|
spin_lock_irq(&file->send_lock);
|
|
ret = is_duplicate(file, packet);
|
|
if (!ret)
|
|
list_add_tail(&packet->list, &file->send_list);
|
|
spin_unlock_irq(&file->send_lock);
|
|
if (ret) {
|
|
ret = -EINVAL;
|
|
goto err_msg;
|
|
}
|
|
|
|
ret = ib_post_send_mad(packet->msg, NULL);
|
|
if (ret)
|
|
goto err_send;
|
|
|
|
up_read(&file->port->mutex);
|
|
return count;
|
|
|
|
err_send:
|
|
dequeue_send(file, packet);
|
|
err_msg:
|
|
ib_free_send_mad(packet->msg);
|
|
err_ah:
|
|
ib_destroy_ah(ah);
|
|
err_up:
|
|
up_read(&file->port->mutex);
|
|
err:
|
|
kfree(packet);
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
|
|
{
|
|
struct ib_umad_file *file = filp->private_data;
|
|
|
|
/* we will always be able to post a MAD send */
|
|
unsigned int mask = POLLOUT | POLLWRNORM;
|
|
|
|
poll_wait(filp, &file->recv_wait, wait);
|
|
|
|
if (!list_empty(&file->recv_list))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
|
|
{
|
|
struct ib_user_mad_reg_req ureq;
|
|
struct ib_mad_reg_req req;
|
|
struct ib_mad_agent *agent;
|
|
int agent_id;
|
|
int ret;
|
|
|
|
down_write(&file->port->mutex);
|
|
|
|
if (!file->port->ib_dev) {
|
|
ret = -EPIPE;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (ureq.qpn != 0 && ureq.qpn != 1) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
|
|
if (!__get_agent(file, agent_id))
|
|
goto found;
|
|
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
|
|
found:
|
|
if (ureq.mgmt_class) {
|
|
req.mgmt_class = ureq.mgmt_class;
|
|
req.mgmt_class_version = ureq.mgmt_class_version;
|
|
memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
|
|
memcpy(req.oui, ureq.oui, sizeof req.oui);
|
|
}
|
|
|
|
agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
|
|
ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
|
|
ureq.mgmt_class ? &req : NULL,
|
|
ureq.rmpp_version,
|
|
send_handler, recv_handler, file);
|
|
if (IS_ERR(agent)) {
|
|
ret = PTR_ERR(agent);
|
|
goto out;
|
|
}
|
|
|
|
if (put_user(agent_id,
|
|
(u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
|
|
ret = -EFAULT;
|
|
ib_unregister_mad_agent(agent);
|
|
goto out;
|
|
}
|
|
|
|
file->agent[agent_id] = agent;
|
|
ret = 0;
|
|
|
|
out:
|
|
up_write(&file->port->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
|
|
{
|
|
struct ib_mad_agent *agent = NULL;
|
|
u32 id;
|
|
int ret = 0;
|
|
|
|
if (get_user(id, (u32 __user *) arg))
|
|
return -EFAULT;
|
|
|
|
down_write(&file->port->mutex);
|
|
|
|
if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
agent = file->agent[id];
|
|
file->agent[id] = NULL;
|
|
|
|
out:
|
|
up_write(&file->port->mutex);
|
|
|
|
if (agent)
|
|
ib_unregister_mad_agent(agent);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case IB_USER_MAD_REGISTER_AGENT:
|
|
return ib_umad_reg_agent(filp->private_data, arg);
|
|
case IB_USER_MAD_UNREGISTER_AGENT:
|
|
return ib_umad_unreg_agent(filp->private_data, arg);
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static int ib_umad_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct ib_umad_port *port;
|
|
struct ib_umad_file *file;
|
|
int ret = 0;
|
|
|
|
spin_lock(&port_lock);
|
|
port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
|
|
if (port)
|
|
kref_get(&port->umad_dev->ref);
|
|
spin_unlock(&port_lock);
|
|
|
|
if (!port)
|
|
return -ENXIO;
|
|
|
|
down_write(&port->mutex);
|
|
|
|
if (!port->ib_dev) {
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
file = kzalloc(sizeof *file, GFP_KERNEL);
|
|
if (!file) {
|
|
kref_put(&port->umad_dev->ref, ib_umad_release_dev);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_init(&file->recv_lock);
|
|
spin_lock_init(&file->send_lock);
|
|
INIT_LIST_HEAD(&file->recv_list);
|
|
INIT_LIST_HEAD(&file->send_list);
|
|
init_waitqueue_head(&file->recv_wait);
|
|
|
|
file->port = port;
|
|
filp->private_data = file;
|
|
|
|
list_add_tail(&file->port_list, &port->file_list);
|
|
|
|
out:
|
|
up_write(&port->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int ib_umad_close(struct inode *inode, struct file *filp)
|
|
{
|
|
struct ib_umad_file *file = filp->private_data;
|
|
struct ib_umad_device *dev = file->port->umad_dev;
|
|
struct ib_umad_packet *packet, *tmp;
|
|
int already_dead;
|
|
int i;
|
|
|
|
down_write(&file->port->mutex);
|
|
|
|
already_dead = file->agents_dead;
|
|
file->agents_dead = 1;
|
|
|
|
list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
|
|
if (packet->recv_wc)
|
|
ib_free_recv_mad(packet->recv_wc);
|
|
kfree(packet);
|
|
}
|
|
|
|
list_del(&file->port_list);
|
|
|
|
downgrade_write(&file->port->mutex);
|
|
|
|
if (!already_dead)
|
|
for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
|
|
if (file->agent[i])
|
|
ib_unregister_mad_agent(file->agent[i]);
|
|
|
|
up_read(&file->port->mutex);
|
|
|
|
kfree(file);
|
|
kref_put(&dev->ref, ib_umad_release_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations umad_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ib_umad_read,
|
|
.write = ib_umad_write,
|
|
.poll = ib_umad_poll,
|
|
.unlocked_ioctl = ib_umad_ioctl,
|
|
.compat_ioctl = ib_umad_ioctl,
|
|
.open = ib_umad_open,
|
|
.release = ib_umad_close
|
|
};
|
|
|
|
static int ib_umad_sm_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct ib_umad_port *port;
|
|
struct ib_port_modify props = {
|
|
.set_port_cap_mask = IB_PORT_SM
|
|
};
|
|
int ret;
|
|
|
|
spin_lock(&port_lock);
|
|
port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
|
|
if (port)
|
|
kref_get(&port->umad_dev->ref);
|
|
spin_unlock(&port_lock);
|
|
|
|
if (!port)
|
|
return -ENXIO;
|
|
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
if (down_trylock(&port->sm_sem)) {
|
|
ret = -EAGAIN;
|
|
goto fail;
|
|
}
|
|
} else {
|
|
if (down_interruptible(&port->sm_sem)) {
|
|
ret = -ERESTARTSYS;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
|
|
if (ret) {
|
|
up(&port->sm_sem);
|
|
goto fail;
|
|
}
|
|
|
|
filp->private_data = port;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
kref_put(&port->umad_dev->ref, ib_umad_release_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int ib_umad_sm_close(struct inode *inode, struct file *filp)
|
|
{
|
|
struct ib_umad_port *port = filp->private_data;
|
|
struct ib_port_modify props = {
|
|
.clr_port_cap_mask = IB_PORT_SM
|
|
};
|
|
int ret = 0;
|
|
|
|
down_write(&port->mutex);
|
|
if (port->ib_dev)
|
|
ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
|
|
up_write(&port->mutex);
|
|
|
|
up(&port->sm_sem);
|
|
|
|
kref_put(&port->umad_dev->ref, ib_umad_release_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct file_operations umad_sm_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ib_umad_sm_open,
|
|
.release = ib_umad_sm_close
|
|
};
|
|
|
|
static struct ib_client umad_client = {
|
|
.name = "umad",
|
|
.add = ib_umad_add_one,
|
|
.remove = ib_umad_remove_one
|
|
};
|
|
|
|
static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct ib_umad_port *port = class_get_devdata(class_dev);
|
|
|
|
if (!port)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%s\n", port->ib_dev->name);
|
|
}
|
|
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
|
|
|
|
static ssize_t show_port(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct ib_umad_port *port = class_get_devdata(class_dev);
|
|
|
|
if (!port)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%d\n", port->port_num);
|
|
}
|
|
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
|
|
|
|
static ssize_t show_abi_version(struct class *class, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
|
|
}
|
|
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
|
|
|
|
static int ib_umad_init_port(struct ib_device *device, int port_num,
|
|
struct ib_umad_port *port)
|
|
{
|
|
spin_lock(&port_lock);
|
|
port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
|
|
if (port->dev_num >= IB_UMAD_MAX_PORTS) {
|
|
spin_unlock(&port_lock);
|
|
return -1;
|
|
}
|
|
set_bit(port->dev_num, dev_map);
|
|
spin_unlock(&port_lock);
|
|
|
|
port->ib_dev = device;
|
|
port->port_num = port_num;
|
|
init_MUTEX(&port->sm_sem);
|
|
init_rwsem(&port->mutex);
|
|
INIT_LIST_HEAD(&port->file_list);
|
|
|
|
port->dev = cdev_alloc();
|
|
if (!port->dev)
|
|
return -1;
|
|
port->dev->owner = THIS_MODULE;
|
|
port->dev->ops = &umad_fops;
|
|
kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num);
|
|
if (cdev_add(port->dev, base_dev + port->dev_num, 1))
|
|
goto err_cdev;
|
|
|
|
port->class_dev = class_device_create(umad_class, NULL, port->dev->dev,
|
|
device->dma_device,
|
|
"umad%d", port->dev_num);
|
|
if (IS_ERR(port->class_dev))
|
|
goto err_cdev;
|
|
|
|
if (class_device_create_file(port->class_dev, &class_device_attr_ibdev))
|
|
goto err_class;
|
|
if (class_device_create_file(port->class_dev, &class_device_attr_port))
|
|
goto err_class;
|
|
|
|
port->sm_dev = cdev_alloc();
|
|
if (!port->sm_dev)
|
|
goto err_class;
|
|
port->sm_dev->owner = THIS_MODULE;
|
|
port->sm_dev->ops = &umad_sm_fops;
|
|
kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num);
|
|
if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
|
|
goto err_sm_cdev;
|
|
|
|
port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev,
|
|
device->dma_device,
|
|
"issm%d", port->dev_num);
|
|
if (IS_ERR(port->sm_class_dev))
|
|
goto err_sm_cdev;
|
|
|
|
class_set_devdata(port->class_dev, port);
|
|
class_set_devdata(port->sm_class_dev, port);
|
|
|
|
if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev))
|
|
goto err_sm_class;
|
|
if (class_device_create_file(port->sm_class_dev, &class_device_attr_port))
|
|
goto err_sm_class;
|
|
|
|
spin_lock(&port_lock);
|
|
umad_port[port->dev_num] = port;
|
|
spin_unlock(&port_lock);
|
|
|
|
return 0;
|
|
|
|
err_sm_class:
|
|
class_device_destroy(umad_class, port->sm_dev->dev);
|
|
|
|
err_sm_cdev:
|
|
cdev_del(port->sm_dev);
|
|
|
|
err_class:
|
|
class_device_destroy(umad_class, port->dev->dev);
|
|
|
|
err_cdev:
|
|
cdev_del(port->dev);
|
|
clear_bit(port->dev_num, dev_map);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void ib_umad_kill_port(struct ib_umad_port *port)
|
|
{
|
|
struct ib_umad_file *file;
|
|
int id;
|
|
|
|
class_set_devdata(port->class_dev, NULL);
|
|
class_set_devdata(port->sm_class_dev, NULL);
|
|
|
|
class_device_destroy(umad_class, port->dev->dev);
|
|
class_device_destroy(umad_class, port->sm_dev->dev);
|
|
|
|
cdev_del(port->dev);
|
|
cdev_del(port->sm_dev);
|
|
|
|
spin_lock(&port_lock);
|
|
umad_port[port->dev_num] = NULL;
|
|
spin_unlock(&port_lock);
|
|
|
|
down_write(&port->mutex);
|
|
|
|
port->ib_dev = NULL;
|
|
|
|
/*
|
|
* Now go through the list of files attached to this port and
|
|
* unregister all of their MAD agents. We need to hold
|
|
* port->mutex while doing this to avoid racing with
|
|
* ib_umad_close(), but we can't hold the mutex for writing
|
|
* while calling ib_unregister_mad_agent(), since that might
|
|
* deadlock by calling back into queue_packet(). So we
|
|
* downgrade our lock to a read lock, and then drop and
|
|
* reacquire the write lock for the next iteration.
|
|
*
|
|
* We do list_del_init() on the file's list_head so that the
|
|
* list_del in ib_umad_close() is still OK, even after the
|
|
* file is removed from the list.
|
|
*/
|
|
while (!list_empty(&port->file_list)) {
|
|
file = list_entry(port->file_list.next, struct ib_umad_file,
|
|
port_list);
|
|
|
|
file->agents_dead = 1;
|
|
list_del_init(&file->port_list);
|
|
|
|
downgrade_write(&port->mutex);
|
|
|
|
for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
|
|
if (file->agent[id])
|
|
ib_unregister_mad_agent(file->agent[id]);
|
|
|
|
up_read(&port->mutex);
|
|
down_write(&port->mutex);
|
|
}
|
|
|
|
up_write(&port->mutex);
|
|
|
|
clear_bit(port->dev_num, dev_map);
|
|
}
|
|
|
|
static void ib_umad_add_one(struct ib_device *device)
|
|
{
|
|
struct ib_umad_device *umad_dev;
|
|
int s, e, i;
|
|
|
|
if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
|
|
return;
|
|
|
|
if (device->node_type == RDMA_NODE_IB_SWITCH)
|
|
s = e = 0;
|
|
else {
|
|
s = 1;
|
|
e = device->phys_port_cnt;
|
|
}
|
|
|
|
umad_dev = kzalloc(sizeof *umad_dev +
|
|
(e - s + 1) * sizeof (struct ib_umad_port),
|
|
GFP_KERNEL);
|
|
if (!umad_dev)
|
|
return;
|
|
|
|
kref_init(&umad_dev->ref);
|
|
|
|
umad_dev->start_port = s;
|
|
umad_dev->end_port = e;
|
|
|
|
for (i = s; i <= e; ++i) {
|
|
umad_dev->port[i - s].umad_dev = umad_dev;
|
|
|
|
if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
|
|
goto err;
|
|
}
|
|
|
|
ib_set_client_data(device, &umad_client, umad_dev);
|
|
|
|
return;
|
|
|
|
err:
|
|
while (--i >= s)
|
|
ib_umad_kill_port(&umad_dev->port[i - s]);
|
|
|
|
kref_put(&umad_dev->ref, ib_umad_release_dev);
|
|
}
|
|
|
|
static void ib_umad_remove_one(struct ib_device *device)
|
|
{
|
|
struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
|
|
int i;
|
|
|
|
if (!umad_dev)
|
|
return;
|
|
|
|
for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
|
|
ib_umad_kill_port(&umad_dev->port[i]);
|
|
|
|
kref_put(&umad_dev->ref, ib_umad_release_dev);
|
|
}
|
|
|
|
static int __init ib_umad_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
|
|
"infiniband_mad");
|
|
if (ret) {
|
|
printk(KERN_ERR "user_mad: couldn't register device number\n");
|
|
goto out;
|
|
}
|
|
|
|
umad_class = class_create(THIS_MODULE, "infiniband_mad");
|
|
if (IS_ERR(umad_class)) {
|
|
ret = PTR_ERR(umad_class);
|
|
printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
|
|
goto out_chrdev;
|
|
}
|
|
|
|
ret = class_create_file(umad_class, &class_attr_abi_version);
|
|
if (ret) {
|
|
printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
|
|
goto out_class;
|
|
}
|
|
|
|
ret = ib_register_client(&umad_client);
|
|
if (ret) {
|
|
printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
|
|
goto out_class;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_class:
|
|
class_destroy(umad_class);
|
|
|
|
out_chrdev:
|
|
unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ib_umad_cleanup(void)
|
|
{
|
|
ib_unregister_client(&umad_client);
|
|
class_destroy(umad_class);
|
|
unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
|
|
}
|
|
|
|
module_init(ib_umad_init);
|
|
module_exit(ib_umad_cleanup);
|