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    Subject[PATCH][v4][16/24] Add Mellanox HCA low-level driver (MAD)
    Add MAD (management datagram) code for Mellanox HCA driver.

    Signed-off-by: Roland Dreier <roland@topspin.com>


    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-bk/drivers/infiniband/hw/mthca/mthca_mad.c 2004-12-19 22:04:16.654244908 -0800
    @@ -0,0 +1,320 @@
    +/*
    + * Copyright (c) 2004 Topspin Communications. 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 <ib_verbs.h>
    +#include <ib_mad.h>
    +#include <ib_smi.h>
    +
    +#include "mthca_dev.h"
    +#include "mthca_cmd.h"
    +
    +enum {
    + MTHCA_VENDOR_CLASS1 = 0x9,
    + MTHCA_VENDOR_CLASS2 = 0xa
    +};
    +
    +struct mthca_trap_mad {
    + struct ib_mad *mad;
    + DECLARE_PCI_UNMAP_ADDR(mapping)
    +};
    +
    +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 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 mthca_trap_mad *tmad;
    + struct ib_sge gather_list;
    + struct ib_send_wr *bad_wr, wr = {
    + .opcode = IB_WR_SEND,
    + .sg_list = &gather_list,
    + .num_sge = 1,
    + .send_flags = IB_SEND_SIGNALED,
    + .wr = {
    + .ud = {
    + .remote_qpn = qpn,
    + .remote_qkey = qpn ? IB_QP1_QKEY : 0,
    + .timeout_ms = 0
    + }
    + }
    + };
    + struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
    + int ret;
    + unsigned long flags;
    +
    + if (agent) {
    + tmad = kmalloc(sizeof *tmad, GFP_KERNEL);
    + if (!tmad)
    + return;
    +
    + tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL);
    + if (!tmad->mad) {
    + kfree(tmad);
    + return;
    + }
    +
    + memcpy(tmad->mad, mad, sizeof *mad);
    +
    + wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr;
    + wr.wr_id = (unsigned long) tmad;
    +
    + gather_list.addr = dma_map_single(agent->device->dma_device,
    + tmad->mad,
    + sizeof *tmad->mad,
    + DMA_TO_DEVICE);
    + gather_list.length = sizeof *tmad->mad;
    + gather_list.lkey = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey;
    + pci_unmap_addr_set(tmad, mapping, gather_list.addr);
    +
    + /*
    + * 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);
    + wr.wr.ud.ah = dev->sm_ah[port_num - 1];
    + if (wr.wr.ud.ah)
    + ret = ib_post_send_mad(agent, &wr, &bad_wr);
    + else
    + ret = -EINVAL;
    + spin_unlock_irqrestore(&dev->sm_lock, flags);
    +
    + if (ret) {
    + dma_unmap_single(agent->device->dma_device,
    + pci_unmap_addr(tmad, mapping),
    + sizeof *tmad->mad,
    + DMA_TO_DEVICE);
    + kfree(tmad->mad);
    + kfree(tmad);
    + }
    + }
    +}
    +
    +int mthca_process_mad(struct ib_device *ibdev,
    + int mad_flags,
    + u8 port_num,
    + u16 slid,
    + struct ib_mad *in_mad,
    + struct ib_mad *out_mad)
    +{
    + int err;
    + u8 status;
    +
    + /* 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),
    + port_num, 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);
    +
    + /* 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)
    +{
    + struct mthca_trap_mad *tmad =
    + (void *) (unsigned long) mad_send_wc->wr_id;
    +
    + dma_unmap_single(agent->device->dma_device,
    + pci_unmap_addr(tmad, mapping),
    + sizeof *tmad->mad,
    + DMA_TO_DEVICE);
    + kfree(tmad->mad);
    + kfree(tmad);
    +}
    +
    +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 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]);
    + }
    +}
    -
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