1 files changed, 351 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_mad.c b/drivers/infiniband/hw/mthca/mthca_mad.c
new file mode 100644
index 000000000..093f7755c
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_mad.c
@@ -0,0 +1,351 @@
+/*
+ * 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.
+ */
+
+#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 int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
+{
+	struct ib_port_attr *tprops = NULL;
+	int                  ret;
+
+	tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
+	if (!tprops)
+		return -ENOMEM;
+
+	ret = ib_query_port(&dev->ib_dev, port_num, tprops);
+	if (ret) {
+		printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
+		       ret, dev->ib_dev.name, port_num);
+		goto out;
+	}
+
+	dev->rate[port_num - 1] = tprops->active_speed *
+				  ib_width_enum_to_int(tprops->active_width);
+
+out:
+	kfree(tprops);
+	return ret;
+}
+
+static void update_sm_ah(struct mthca_dev *dev,
+			 u8 port_num, u16 lid, u8 sl)
+{
+	struct ib_ah *new_ah;
+	struct rdma_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.type = rdma_ah_find_type(&dev->ib_dev, port_num);
+	rdma_ah_set_dlid(&ah_attr, lid);
+	rdma_ah_set_sl(&ah_attr, sl);
+	rdma_ah_set_port_num(&ah_attr, port_num);
+
+	new_ah = rdma_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])
+		rdma_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,
+		      const struct ib_mad *mad,
+		      u16 prev_lid)
+{
+	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) {
+			struct ib_port_info *pinfo =
+				(struct ib_port_info *) ((struct ib_smp *) mad)->data;
+			u16 lid = be16_to_cpu(pinfo->lid);
+
+			mthca_update_rate(to_mdev(ibdev), port_num);
+			update_sm_ah(to_mdev(ibdev), port_num,
+				     be16_to_cpu(pinfo->sm_lid),
+				     pinfo->neighbormtu_mastersmsl & 0xf);
+
+			event.device           = ibdev;
+			event.element.port_num = port_num;
+
+			if (pinfo->clientrereg_resv_subnetto & 0x80) {
+				event.event    = IB_EVENT_CLIENT_REREGISTER;
+				ib_dispatch_event(&event);
+			}
+
+			if (prev_lid != lid) {
+				event.event    = IB_EVENT_LID_CHANGE;
+				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,
+		       IB_DEVICE_NODE_DESC_MAX);
+		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
+	}
+}
+
+static void forward_trap(struct mthca_dev *dev,
+			 u8 port_num,
+			 const 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,
+					      IB_MGMT_BASE_VERSION);
+		if (IS_ERR(send_buf))
+			return;
+		/*
+		 * 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,
+		      const struct ib_wc *in_wc,
+		      const struct ib_grh *in_grh,
+		      const struct ib_mad_hdr *in, size_t in_mad_size,
+		      struct ib_mad_hdr *out, size_t *out_mad_size,
+		      u16 *out_mad_pkey_index)
+{
+	int err;
+	u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
+	u16 prev_lid = 0;
+	struct ib_port_attr pattr;
+	const struct ib_mad *in_mad = (const struct ib_mad *)in;
+	struct ib_mad *out_mad = (struct ib_mad *)out;
+
+	if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
+			 *out_mad_size != sizeof(*out_mad)))
+		return IB_MAD_RESULT_FAILURE;
+
+	/* 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;
+	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) &&
+	    in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
+	    in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
+	    !ib_query_port(ibdev, port_num, &pattr))
+		prev_lid = ib_lid_cpu16(pattr.lid);
+
+	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);
+	if (err == -EBADMSG)
+		return IB_MAD_RESULT_SUCCESS;
+	else if (err) {
+		mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
+		return IB_MAD_RESULT_FAILURE;
+	}
+
+	if (!out_mad->mad_hdr.status) {
+		smp_snoop(ibdev, port_num, in_mad, prev_lid);
+		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;
+	int ret;
+
+	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, 0);
+			if (IS_ERR(agent)) {
+				ret = PTR_ERR(agent);
+				goto err;
+			}
+			dev->send_agent[p][q] = agent;
+		}
+
+
+	for (p = 1; p <= dev->limits.num_ports; ++p) {
+		ret = mthca_update_rate(dev, p);
+		if (ret) {
+			mthca_err(dev, "Failed to obtain port %d rate."
+				  " aborting.\n", p);
+			goto err;
+		}
+	}
+
+	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 ret;
+}
+
+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])
+			rdma_destroy_ah(dev->sm_ah[p]);
+	}
+}