1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/infiniband/core/agent.c b/drivers/infiniband/core/agent.c
new file mode 100644
index 000000000000..7aee5ebf3f01
--- /dev/null
+++ b/drivers/infiniband/core/agent.c
@@ -0,0 +1,373 @@
+/*
+ * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
+ * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
+ * Copyright (c) 2004 Intel Corporation.  All rights reserved.
+ * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
+ * Copyright (c) 2004 Voltaire 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.
+ *
+ * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
+ */
+
+#include <linux/dma-mapping.h>
+
+#include <asm/bug.h>
+
+#include <ib_smi.h>
+
+#include "smi.h"
+#include "agent_priv.h"
+#include "mad_priv.h"
+#include "agent.h"
+
+spinlock_t ib_agent_port_list_lock;
+static LIST_HEAD(ib_agent_port_list);
+
+/*
+ * Caller must hold ib_agent_port_list_lock
+ */
+static inline struct ib_agent_port_private *
+__ib_get_agent_port(struct ib_device *device, int port_num,
+		    struct ib_mad_agent *mad_agent)
+{
+	struct ib_agent_port_private *entry;
+
+	BUG_ON(!(!!device ^ !!mad_agent));  /* Exactly one MUST be (!NULL) */
+
+	if (device) {
+		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
+			if (entry->smp_agent->device == device &&
+			    entry->port_num == port_num)
+				return entry;
+		}
+	} else {
+		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
+			if ((entry->smp_agent == mad_agent) ||
+			    (entry->perf_mgmt_agent == mad_agent))
+				return entry;
+		}
+	}
+	return NULL;
+}
+
+static inline struct ib_agent_port_private *
+ib_get_agent_port(struct ib_device *device, int port_num,
+		  struct ib_mad_agent *mad_agent)
+{
+	struct ib_agent_port_private *entry;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
+	entry = __ib_get_agent_port(device, port_num, mad_agent);
+	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
+
+	return entry;
+}
+
+int smi_check_local_dr_smp(struct ib_smp *smp,
+			   struct ib_device *device,
+			   int port_num)
+{
+	struct ib_agent_port_private *port_priv;
+
+	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
+		return 1;
+	port_priv = ib_get_agent_port(device, port_num, NULL);
+	if (!port_priv) {
+		printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
+		       "not open\n",
+		       device->name, port_num);
+		return 1;
+	}
+
+	return smi_check_local_smp(port_priv->smp_agent, smp);
+}
+
+static int agent_mad_send(struct ib_mad_agent *mad_agent,
+			  struct ib_agent_port_private *port_priv,
+			  struct ib_mad_private *mad_priv,
+			  struct ib_grh *grh,
+			  struct ib_wc *wc)
+{
+	struct ib_agent_send_wr *agent_send_wr;
+	struct ib_sge gather_list;
+	struct ib_send_wr send_wr;
+	struct ib_send_wr *bad_send_wr;
+	struct ib_ah_attr ah_attr;
+	unsigned long flags;
+	int ret = 1;
+
+	agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
+	if (!agent_send_wr)
+		goto out;
+	agent_send_wr->mad = mad_priv;
+
+	/* PCI mapping */
+	gather_list.addr = dma_map_single(mad_agent->device->dma_device,
+					  &mad_priv->mad,
+					  sizeof(mad_priv->mad),
+					  DMA_TO_DEVICE);
+	gather_list.length = sizeof(mad_priv->mad);
+	gather_list.lkey = (*port_priv->mr).lkey;
+
+	send_wr.next = NULL;
+	send_wr.opcode = IB_WR_SEND;
+	send_wr.sg_list = &gather_list;
+	send_wr.num_sge = 1;
+	send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
+	send_wr.wr.ud.timeout_ms = 0;
+	send_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED;
+
+	ah_attr.dlid = wc->slid;
+	ah_attr.port_num = mad_agent->port_num;
+	ah_attr.src_path_bits = wc->dlid_path_bits;
+	ah_attr.sl = wc->sl;
+	ah_attr.static_rate = 0;
+	ah_attr.ah_flags = 0; /* No GRH */
+	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
+		if (wc->wc_flags & IB_WC_GRH) {
+			ah_attr.ah_flags = IB_AH_GRH;
+			/* Should sgid be looked up ? */
+			ah_attr.grh.sgid_index = 0;
+			ah_attr.grh.hop_limit = grh->hop_limit;
+			ah_attr.grh.flow_label = be32_to_cpup(
+				&grh->version_tclass_flow)  & 0xfffff;
+			ah_attr.grh.traffic_class = (be32_to_cpup(
+				&grh->version_tclass_flow) >> 20) & 0xff;
+			memcpy(ah_attr.grh.dgid.raw,
+			       grh->sgid.raw,
+			       sizeof(ah_attr.grh.dgid));
+		}
+	}
+
+	agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
+	if (IS_ERR(agent_send_wr->ah)) {
+		printk(KERN_ERR SPFX "No memory for address handle\n");
+		kfree(agent_send_wr);
+		goto out;
+	}
+
+	send_wr.wr.ud.ah = agent_send_wr->ah;
+	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
+		send_wr.wr.ud.pkey_index = wc->pkey_index;
+		send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
+	} else { 	/* for SMPs */
+		send_wr.wr.ud.pkey_index = 0;
+		send_wr.wr.ud.remote_qkey = 0;
+	}
+	send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
+	send_wr.wr_id = (unsigned long)agent_send_wr;
+
+	pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);
+
+	/* Send */
+	spin_lock_irqsave(&port_priv->send_list_lock, flags);
+	if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
+		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
+		dma_unmap_single(mad_agent->device->dma_device,
+				 pci_unmap_addr(agent_send_wr, mapping),
+				 sizeof(mad_priv->mad),
+				 DMA_TO_DEVICE);
+		ib_destroy_ah(agent_send_wr->ah);
+		kfree(agent_send_wr);
+	} else {
+		list_add_tail(&agent_send_wr->send_list,
+			      &port_priv->send_posted_list);
+		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
+		ret = 0;
+	}
+
+out:
+	return ret;
+}
+
+int agent_send(struct ib_mad_private *mad,
+	       struct ib_grh *grh,
+	       struct ib_wc *wc,
+	       struct ib_device *device,
+	       int port_num)
+{
+	struct ib_agent_port_private *port_priv;
+	struct ib_mad_agent *mad_agent;
+
+	port_priv = ib_get_agent_port(device, port_num, NULL);
+	if (!port_priv) {
+		printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
+		       device->name, port_num);
+		return 1;
+	}
+
+	/* Get mad agent based on mgmt_class in MAD */
+	switch (mad->mad.mad.mad_hdr.mgmt_class) {
+		case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
+		case IB_MGMT_CLASS_SUBN_LID_ROUTED:
+			mad_agent = port_priv->smp_agent;
+			break;
+		case IB_MGMT_CLASS_PERF_MGMT:
+			mad_agent = port_priv->perf_mgmt_agent;
+			break;
+		default:
+			return 1;
+	}
+
+	return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
+}
+
+static void agent_send_handler(struct ib_mad_agent *mad_agent,
+			       struct ib_mad_send_wc *mad_send_wc)
+{
+	struct ib_agent_port_private	*port_priv;
+	struct ib_agent_send_wr		*agent_send_wr;
+	unsigned long			flags;
+
+	/* Find matching MAD agent */
+	port_priv = ib_get_agent_port(NULL, 0, mad_agent);
+	if (!port_priv) {
+		printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
+		       "agent %p\n", mad_agent);
+		return;
+	}
+
+	agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
+	spin_lock_irqsave(&port_priv->send_list_lock, flags);
+	/* Remove completed send from posted send MAD list */
+	list_del(&agent_send_wr->send_list);
+	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
+
+	/* Unmap PCI */
+	dma_unmap_single(mad_agent->device->dma_device,
+			 pci_unmap_addr(agent_send_wr, mapping),
+			 sizeof(agent_send_wr->mad->mad),
+			 DMA_TO_DEVICE);
+
+	ib_destroy_ah(agent_send_wr->ah);
+
+	/* Release allocated memory */
+	kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
+	kfree(agent_send_wr);
+}
+
+int ib_agent_port_open(struct ib_device *device, int port_num)
+{
+	int ret;
+	struct ib_agent_port_private *port_priv;
+	unsigned long flags;
+
+	/* First, check if port already open for SMI */
+	port_priv = ib_get_agent_port(device, port_num, NULL);
+	if (port_priv) {
+		printk(KERN_DEBUG SPFX "%s port %d already open\n",
+		       device->name, port_num);
+		return 0;
+	}
+
+	/* Create new device info */
+	port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
+	if (!port_priv) {
+		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
+		ret = -ENOMEM;
+		goto error1;
+	}
+
+	memset(port_priv, 0, sizeof *port_priv);
+	port_priv->port_num = port_num;
+	spin_lock_init(&port_priv->send_list_lock);
+	INIT_LIST_HEAD(&port_priv->send_posted_list);
+
+	/* Obtain send only MAD agent for SM class (SMI QP) */
+	port_priv->smp_agent = ib_register_mad_agent(device, port_num,
+						     IB_QPT_SMI,
+						     NULL, 0,
+						    &agent_send_handler,
+						     NULL, NULL);
+
+	if (IS_ERR(port_priv->smp_agent)) {
+		ret = PTR_ERR(port_priv->smp_agent);
+		goto error2;
+	}
+
+	/* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
+	port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
+							   IB_QPT_GSI,
+							   NULL, 0,
+							  &agent_send_handler,
+							   NULL, NULL);
+	if (IS_ERR(port_priv->perf_mgmt_agent)) {
+		ret = PTR_ERR(port_priv->perf_mgmt_agent);
+		goto error3;
+	}
+
+	port_priv->mr = ib_get_dma_mr(port_priv->smp_agent->qp->pd,
+				      IB_ACCESS_LOCAL_WRITE);
+	if (IS_ERR(port_priv->mr)) {
+		printk(KERN_ERR SPFX "Couldn't get DMA MR\n");
+		ret = PTR_ERR(port_priv->mr);
+		goto error4;
+	}
+
+	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
+	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
+	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
+
+	return 0;
+
+error4:
+	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
+error3:
+	ib_unregister_mad_agent(port_priv->smp_agent);
+error2:
+	kfree(port_priv);
+error1:
+	return ret;
+}
+
+int ib_agent_port_close(struct ib_device *device, int port_num)
+{
+	struct ib_agent_port_private *port_priv;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
+	port_priv = __ib_get_agent_port(device, port_num, NULL);
+	if (port_priv == NULL) {
+		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
+		printk(KERN_ERR SPFX "Port %d not found\n", port_num);
+		return -ENODEV;
+	}
+	list_del(&port_priv->port_list);
+	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
+
+	ib_dereg_mr(port_priv->mr);
+
+	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
+	ib_unregister_mad_agent(port_priv->smp_agent);
+	kfree(port_priv);
+
+	return 0;
+}