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-rw-r--r--drivers/infiniband/hw/mlx4/mad.c339
1 files changed, 339 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
new file mode 100644
index 00000000000..333091787c5
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (c) 2007 Cisco Systems, 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 <rdma/ib_mad.h>
+#include <rdma/ib_smi.h>
+
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4_ib.h"
+
+enum {
+ MLX4_IB_VENDOR_CLASS1 = 0x9,
+ MLX4_IB_VENDOR_CLASS2 = 0xa
+};
+
+int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
+ int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
+ void *in_mad, void *response_mad)
+{
+ struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
+ void *inbox;
+ int err;
+ u32 in_modifier = port;
+ u8 op_modifier = 0;
+
+ inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
+ if (IS_ERR(inmailbox))
+ return PTR_ERR(inmailbox);
+ inbox = inmailbox->buf;
+
+ outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
+ if (IS_ERR(outmailbox)) {
+ mlx4_free_cmd_mailbox(dev->dev, inmailbox);
+ return PTR_ERR(outmailbox);
+ }
+
+ memcpy(inbox, in_mad, 256);
+
+ /*
+ * Key check traps can't be generated unless we have in_wc to
+ * tell us where to send the trap.
+ */
+ if (ignore_mkey || !in_wc)
+ op_modifier |= 0x1;
+ if (ignore_bkey || !in_wc)
+ op_modifier |= 0x2;
+
+ if (in_wc) {
+ struct {
+ __be32 my_qpn;
+ u32 reserved1;
+ __be32 rqpn;
+ u8 sl;
+ u8 g_path;
+ u16 reserved2[2];
+ __be16 pkey;
+ u32 reserved3[11];
+ u8 grh[40];
+ } *ext_info;
+
+ memset(inbox + 256, 0, 256);
+ ext_info = inbox + 256;
+
+ ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
+ ext_info->rqpn = cpu_to_be32(in_wc->src_qp);
+ ext_info->sl = in_wc->sl << 4;
+ ext_info->g_path = in_wc->dlid_path_bits |
+ (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
+ ext_info->pkey = cpu_to_be16(in_wc->pkey_index);
+
+ if (in_grh)
+ memcpy(ext_info->grh, in_grh, 40);
+
+ op_modifier |= 0x4;
+
+ in_modifier |= in_wc->slid << 16;
+ }
+
+ err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
+ in_modifier, op_modifier,
+ MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);
+
+ if (!err);
+ memcpy(response_mad, outmailbox->buf, 256);
+
+ mlx4_free_cmd_mailbox(dev->dev, inmailbox);
+ mlx4_free_cmd_mailbox(dev->dev, outmailbox);
+
+ return err;
+}
+
+static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
+{
+ struct ib_ah *new_ah;
+ struct ib_ah_attr ah_attr;
+
+ 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(&dev->sm_lock);
+ 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(&dev->sm_lock);
+}
+
+/*
+ * 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) {
+ struct ib_port_info *pinfo =
+ (struct ib_port_info *) ((struct ib_smp *) mad)->data;
+
+ 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;
+ else
+ 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) {
+ spin_lock(&to_mdev(dev)->sm_lock);
+ memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
+ spin_unlock(&to_mdev(dev)->sm_lock);
+ }
+}
+
+static void forward_trap(struct mlx4_ib_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;
+
+ 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(&dev->sm_lock);
+ 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(&dev->sm_lock);
+
+ if (ret)
+ ib_free_send_mad(send_buf);
+ }
+}
+
+int mlx4_ib_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)
+{
+ u16 slid;
+ int err;
+
+ slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
+
+ 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;
+ }
+
+ 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 == MLX4_IB_VENDOR_CLASS1 ||
+ in_mad->mad_hdr.mgmt_class == MLX4_IB_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 = mlx4_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)
+ 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 mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
+{
+ struct ib_mad_agent *agent;
+ int p, q;
+ int ret;
+
+ for (p = 0; p < dev->dev->caps.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)) {
+ ret = PTR_ERR(agent);
+ goto err;
+ }
+ dev->send_agent[p][q] = agent;
+ }
+
+ return 0;
+
+err:
+ for (p = 0; p < dev->dev->caps.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 mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
+{
+ struct ib_mad_agent *agent;
+ int p, q;
+
+ for (p = 0; p < dev->dev->caps.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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