/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
* Copyright (c) 2004 Voltaire, Inc. 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.
*
* $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
*/
#include <linux/string.h>
#include <linux/slab.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>
#include "mthca_dev.h"
#include "mthca_cmd.h"
enum {
MTHCA_VENDOR_CLASS1 = 0x9,
MTHCA_VENDOR_CLASS2 = 0xa
};
static void update_sm_ah(struct mthca_dev *dev,
u8 port_num, u16 lid, u8 sl)
{
struct ib_ah *new_ah;
struct ib_ah_attr ah_attr;
unsigned long flags;
if (!dev->send_agent[port_num - 1][0])
return;
memset(&ah_attr, 0, sizeof ah_attr);
ah_attr.dlid = lid;
ah_attr.sl = sl;
ah_attr.port_num = port_num;
new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
&ah_attr);
if (IS_ERR(new_ah))
return;
spin_lock_irqsave(&dev->sm_lock, flags);
if (dev->sm_ah[port_num - 1])
ib_destroy_ah(dev->sm_ah[port_num - 1]);
dev->sm_ah[port_num - 1] = new_ah;
spin_unlock_irqrestore(&dev->sm_lock, flags);
}
/*
* Snoop SM MADs for port info and P_Key table sets, so we can
* synthesize LID change and P_Key change events.
*/
static void smp_snoop(struct ib_device *ibdev,
u8 port_num,
struct ib_mad *mad)
{
struct ib_event event;
if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
update_sm_ah(to_mdev(ibdev), port_num,
be16_to_cpup((__be16 *) (mad->data + 58)),
(*(u8 *) (mad->data + 76)) & 0xf);
event.device = ibdev;
event.event = IB_EVENT_LID_CHANGE;
event.element.port_num = port_num;
ib_dispatch_event(&event);
}
if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
event.device = ibdev;
event.event = IB_EVENT_PKEY_CHANGE;
event.element.port_num = port_num;
ib_dispatch_event(&event);
}
}
}
static void node_desc_override(struct ib_device *dev,
struct ib_mad *mad)
{
if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
mutex_lock(&to_mdev(dev)->cap_mask_mutex);
memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
}
}
static void forward_trap(struct mthca_dev *dev,
u8 port_num,
struct ib_mad *mad)
{
int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
struct ib_mad_send_buf *send_buf;
struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
int ret;
unsigned long flags;
if (agent) {
send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
IB_MGMT_MAD_DATA, GFP_ATOMIC);
/*
* We rely here on the fact that MLX QPs don't use the
* address handle after the send is posted (this is
* wrong following the IB spec strictly, but we know
* it's OK for our devices).
*/
spin_lock_irqsave(&dev->sm_lock, flags);
memcpy(send_buf->mad, mad, sizeof *mad);
if ((send_buf->ah = dev->sm_ah[port_num - 1]))
ret = ib_post_send_mad(send_buf, NULL);
else
ret = -EINVAL;
spin_unlock_irqrestore(&dev->sm_lock, flags);
if (ret)
ib_free_send_mad(send_buf);
}
}
int mthca_process_mad(struct ib_device *ibdev,
int mad_flags,
u8 port_num,
struct ib_wc *in_wc,
struct ib_grh *in_grh,
struct ib_mad *in_mad,
struct ib_mad *out_mad)
{
int err;
u8 status;
u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
/* Forward locally generated traps to the SM */
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
slid == 0) {
forward_trap(to_mdev(ibdev), port_num, in_mad);
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
}
/*
* Only handle SM gets, sets and trap represses for SM class
*
* Only handle PMA and Mellanox vendor-specific class gets and
* sets for other classes.
*/
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
return IB_MAD_RESULT_SUCCESS;
/*
* Don't process SMInfo queries or vendor-specific
* MADs -- the SMA can't handle them.
*/
if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
IB_SMP_ATTR_VENDOR_MASK))
return IB_MAD_RESULT_SUCCESS;
} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
return IB_MAD_RESULT_SUCCESS;
} else
return IB_MAD_RESULT_SUCCESS;
err = mthca_MAD_IFC(to_mdev(ibdev),
mad_flags & IB_MAD_IGNORE_MKEY,
mad_flags & IB_MAD_IGNORE_BKEY,
port_num, in_wc, in_grh, in_mad, out_mad,
&status);
if (err) {
mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
return IB_MAD_RESULT_FAILURE;
}
if (status == MTHCA_CMD_STAT_BAD_PKT)
return IB_MAD_RESULT_SUCCESS;
if (status) {
mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
status);
return IB_MAD_RESULT_FAILURE;
}
if (!out_mad->mad_hdr.status) {
smp_snoop(ibdev, port_num, in_mad);
node_desc_override(ibdev, out_mad);
}
/* set return bit in status of directed route responses */
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
/* no response for trap repress */
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}
static void send_handler(struct ib_mad_agent *agent,
struct ib_mad_send_wc *mad_send_wc)
{
ib_free_send_mad(mad_send_wc->send_buf);
}
int mthca_create_agents(struct mthca_dev *dev)
{
struct ib_mad_agent *agent;
int p, q;
spin_lock_init(&dev->sm_lock);
for (p = 0; p < dev->limits.num_ports; ++p)
for (q = 0; q <= 1; ++q) {
agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
q ? IB_QPT_GSI : IB_QPT_SMI,
NULL, 0, send_handler,
NULL, NULL);
if (IS_ERR(agent))
goto err;
dev->send_agent[p][q] = agent;
}
return 0;
err:
for (p = 0; p < dev->limits.num_ports; ++p)
for (q = 0; q <= 1; ++q)
if (dev->send_agent[p][q])
ib_unregister_mad_agent(dev->send_agent[p][q]);
return PTR_ERR(agent);
}
void __devexit mthca_free_agents(struct mthca_dev *dev)
{
struct ib_mad_agent *agent;
int p, q;
for (p = 0; p < dev->limits.num_ports; ++p) {
for (q = 0; q <= 1; ++q) {
agent = dev->send_agent[p][q];
dev->send_agent[p][q] = NULL;
ib_unregister_mad_agent(agent);
}
if (dev->sm_ah[p])
ib_destroy_ah(dev->sm_ah[p]);
}
}
