mlx5: Add driver for Mellanox Connect-IB adapters

The driver is comprised of two kernel modules: mlx5_ib and mlx5_core.
This partitioning resembles what we have for mlx4, except that mlx5_ib
is the pci device driver and not mlx5_core.

mlx5_core is essentially a library that provides general functionality
that is intended to be used by other Mellanox devices that will be
introduced in the future.  mlx5_ib has a similar role as any hardware
device under drivers/infiniband/hw.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>

[ Merge in coccinelle fixes from Fengguang Wu <fengguang.wu@intel.com>.
  - Roland ]

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

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx5/mad.c b/drivers/infiniband/hw/mlx5/mad.c
new file mode 100644
index 000000000000..5c8938be0e08
--- /dev/null
+++ b/drivers/infiniband/hw/mlx5/mad.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2013, Mellanox Technologies 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/mlx5/cmd.h>
+#include <rdma/ib_mad.h>
+#include <rdma/ib_smi.h>
+#include "mlx5_ib.h"
+
+enum {
+        MLX5_IB_VENDOR_CLASS1 = 0x9,
+        MLX5_IB_VENDOR_CLASS2 = 0xa
+};
+
+int mlx5_MAD_IFC(struct mlx5_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)
+{
+        u8 op_modifier = 0;
+
+        /* 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;
+
+        return mlx5_core_mad_ifc(&dev->mdev, in_mad, response_mad, op_modifier, port);
+}
+
+int mlx5_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)
+                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 -- the SMA can't handle them.
+                 */
+                if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
+                        return IB_MAD_RESULT_SUCCESS;
+        } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
+                   in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS1   ||
+                   in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS2   ||
+                   in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
+                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 = mlx5_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;
+
+        /* 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;
+}
+
+int mlx5_query_ext_port_caps(struct mlx5_ib_dev *dev, u8 port)
+{
+        struct ib_smp *in_mad  = NULL;
+        struct ib_smp *out_mad = NULL;
+        int err = -ENOMEM;
+        u16 packet_error;
+
+        in_mad  = kzalloc(sizeof(*in_mad), GFP_KERNEL);
+        out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
+        if (!in_mad || !out_mad)
+                goto out;
+
+        init_query_mad(in_mad);
+        in_mad->attr_id = MLX5_ATTR_EXTENDED_PORT_INFO;
+        in_mad->attr_mod = cpu_to_be32(port);
+
+        err = mlx5_MAD_IFC(dev, 1, 1, 1, NULL, NULL, in_mad, out_mad);
+
+        packet_error = be16_to_cpu(out_mad->status);
+
+        dev->mdev.caps.ext_port_cap[port - 1] = (!err && !packet_error) ?
+                MLX_EXT_PORT_CAP_FLAG_EXTENDED_PORT_INFO : 0;
+
+out:
+        kfree(in_mad);
+        kfree(out_mad);
+        return err;
+}