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[PATCH][v5][16/24] Add Mellanox HCA low-level driver (MAD)

To: davem@xxxxxxxxxxxxx
Subject: [PATCH][v5][16/24] Add Mellanox HCA low-level driver (MAD)
From: Roland Dreier <roland@xxxxxxxxxxx>
Date: Mon, 27 Dec 2004 21:51:13 -0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, openib-general@xxxxxxxxxx
In-reply-to: <200412272151.KJdDvki21LuSsIo9@xxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
Add MAD (management datagram) code for Mellanox HCA driver.

Signed-off-by: Roland Dreier <roland@xxxxxxxxxxx>


--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ linux-bk/drivers/infiniband/hw/mthca/mthca_mad.c    2004-12-27 
21:48:24.331384733 -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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