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[PATCH][v5][7/24] Add InfiniBand MAD SMI support

To: davem@xxxxxxxxxxxxx
Subject: [PATCH][v5][7/24] Add InfiniBand MAD SMI support
From: Roland Dreier <roland@xxxxxxxxxxx>
Date: Mon, 27 Dec 2004 21:51:00 -0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, openib-general@xxxxxxxxxx
In-reply-to: <200412272150.vaYM2cWv3KsWVYPV@topspin.com>
Sender: netdev-bounce@xxxxxxxxxxx
Add MAD layer SMI (Subnet Management Interface) code.

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


--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ linux-bk/drivers/infiniband/core/smi.c      2004-12-27 21:48:20.566938847 
-0800
@@ -0,0 +1,234 @@
+/*
+ * 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: smi.c 1389 2004-12-27 22:56:47Z roland $
+ */
+
+#include <ib_smi.h>
+
+
+/*
+ * Fixup a directed route SMP for sending
+ * Return 0 if the SMP should be discarded
+ */
+int smi_handle_dr_smp_send(struct ib_smp *smp,
+                          u8 node_type,
+                          int port_num)
+{
+       u8 hop_ptr, hop_cnt;
+
+       hop_ptr = smp->hop_ptr;
+       hop_cnt = smp->hop_cnt;
+
+       /* See section 14.2.2.2, Vol 1 IB spec */
+       if (!ib_get_smp_direction(smp)) {
+               /* C14-9:1 */
+               if (hop_cnt && hop_ptr == 0) {
+                       smp->hop_ptr++;
+                       return (smp->initial_path[smp->hop_ptr] ==
+                               port_num);
+               }
+
+               /* C14-9:2 */
+               if (hop_ptr && hop_ptr < hop_cnt) {
+                       if (node_type != IB_NODE_SWITCH)
+                               return 0;
+
+                       /* smp->return_path set when received */
+                       smp->hop_ptr++;
+                       return (smp->initial_path[smp->hop_ptr] ==
+                               port_num);
+               }
+
+               /* C14-9:3 -- We're at the end of the DR segment of path */
+               if (hop_ptr == hop_cnt) {
+                       /* smp->return_path set when received */
+                       smp->hop_ptr++;
+                       return (node_type == IB_NODE_SWITCH ||
+                               smp->dr_dlid == IB_LID_PERMISSIVE);
+               }
+
+               /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+               /* C14-9:5 -- Fail unreasonable hop pointer */
+               return (hop_ptr == hop_cnt + 1);
+
+       } else {
+               /* C14-13:1 */
+               if (hop_cnt && hop_ptr == hop_cnt + 1) {
+                       smp->hop_ptr--;
+                       return (smp->return_path[smp->hop_ptr] ==
+                               port_num);
+               }
+
+               /* C14-13:2 */
+               if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
+                       if (node_type != IB_NODE_SWITCH)
+                               return 0;
+
+                       smp->hop_ptr--;
+                       return (smp->return_path[smp->hop_ptr] ==
+                               port_num);
+               }
+
+               /* C14-13:3 -- at the end of the DR segment of path */
+               if (hop_ptr == 1) {
+                       smp->hop_ptr--;
+                       /* C14-13:3 -- SMPs destined for SM shouldn't be here */
+                       return (node_type == IB_NODE_SWITCH ||
+                               smp->dr_slid == IB_LID_PERMISSIVE);
+               }
+
+               /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
+               if (hop_ptr == 0)
+                       return 1;
+
+               /* C14-13:5 -- Check for unreasonable hop pointer */
+               return 0;
+       }
+}
+
+/*
+ * Adjust information for a received SMP
+ * Return 0 if the SMP should be dropped
+ */
+int smi_handle_dr_smp_recv(struct ib_smp *smp,
+                          u8 node_type,
+                          int port_num,
+                          int phys_port_cnt)
+{
+       u8 hop_ptr, hop_cnt;
+
+       hop_ptr = smp->hop_ptr;
+       hop_cnt = smp->hop_cnt;
+
+       /* See section 14.2.2.2, Vol 1 IB spec */
+       if (!ib_get_smp_direction(smp)) {
+               /* C14-9:1 -- sender should have incremented hop_ptr */
+               if (hop_cnt && hop_ptr == 0)
+                       return 0;
+
+               /* C14-9:2 -- intermediate hop */
+               if (hop_ptr && hop_ptr < hop_cnt) {
+                       if (node_type != IB_NODE_SWITCH)
+                               return 0;
+
+                       smp->return_path[hop_ptr] = port_num;
+                       /* smp->hop_ptr updated when sending */
+                       return (smp->initial_path[hop_ptr+1] <= phys_port_cnt);
+               }
+
+               /* C14-9:3 -- We're at the end of the DR segment of path */
+               if (hop_ptr == hop_cnt) {
+                       if (hop_cnt)
+                               smp->return_path[hop_ptr] = port_num;
+                       /* smp->hop_ptr updated when sending */
+
+                       return (node_type == IB_NODE_SWITCH ||
+                               smp->dr_dlid == IB_LID_PERMISSIVE);
+               }
+
+               /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+               /* C14-9:5 -- fail unreasonable hop pointer */
+               return (hop_ptr == hop_cnt + 1);
+
+       } else {
+
+               /* C14-13:1 */
+               if (hop_cnt && hop_ptr == hop_cnt + 1) {
+                       smp->hop_ptr--;
+                       return (smp->return_path[smp->hop_ptr] ==
+                               port_num);
+               }
+
+               /* C14-13:2 */
+               if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
+                       if (node_type != IB_NODE_SWITCH)
+                               return 0;
+
+                       /* smp->hop_ptr updated when sending */
+                       return (smp->return_path[hop_ptr-1] <= phys_port_cnt);
+               }
+
+               /* C14-13:3 -- We're at the end of the DR segment of path */
+               if (hop_ptr == 1) {
+                       if (smp->dr_slid == IB_LID_PERMISSIVE) {
+                               /* giving SMP to SM - update hop_ptr */
+                               smp->hop_ptr--;
+                               return 1;
+                       }
+                       /* smp->hop_ptr updated when sending */
+                       return (node_type == IB_NODE_SWITCH);
+               }
+
+               /* C14-13:4 -- hop_ptr = 0 -> give to SM */
+               /* C14-13:5 -- Check for unreasonable hop pointer */
+               return (hop_ptr == 0);
+       }
+}
+
+/*
+ * Return 1 if the received DR SMP should be forwarded to the send queue
+ * Return 0 if the SMP should be completed up the stack
+ */
+int smi_check_forward_dr_smp(struct ib_smp *smp)
+{
+       u8 hop_ptr, hop_cnt;
+
+       hop_ptr = smp->hop_ptr;
+       hop_cnt = smp->hop_cnt;
+
+       if (!ib_get_smp_direction(smp)) {
+               /* C14-9:2 -- intermediate hop */
+               if (hop_ptr && hop_ptr < hop_cnt)
+                       return 1;
+
+               /* C14-9:3 -- at the end of the DR segment of path */
+               if (hop_ptr == hop_cnt)
+                       return (smp->dr_dlid == IB_LID_PERMISSIVE);
+
+               /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+               if (hop_ptr == hop_cnt + 1)
+                       return 1;
+       } else {
+               /* C14-13:2 */
+               if (2 <= hop_ptr && hop_ptr <= hop_cnt)
+                       return 1;
+
+               /* C14-13:3 -- at the end of the DR segment of path */
+               if (hop_ptr == 1)
+                       return (smp->dr_slid != IB_LID_PERMISSIVE);
+       }
+       return 0;
+}
--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ linux-bk/drivers/infiniband/core/smi.h      2004-12-27 21:48:20.592935020 
-0800
@@ -0,0 +1,67 @@
+/*
+ * 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: smi.h 1389 2004-12-27 22:56:47Z roland $
+ */
+
+#ifndef __SMI_H_
+#define __SMI_H_
+
+int smi_handle_dr_smp_recv(struct ib_smp *smp,
+                          u8 node_type,
+                          int port_num,
+                          int phys_port_cnt);
+extern int smi_check_forward_dr_smp(struct ib_smp *smp);
+extern int smi_handle_dr_smp_send(struct ib_smp *smp,
+                                 u8 node_type,
+                                 int port_num);
+extern int smi_check_local_dr_smp(struct ib_smp *smp,
+                                 struct ib_device *device,
+                                 int port_num);
+
+/*
+ * Return 1 if the SMP should be handled by the local SMA/SM via process_mad
+ */
+static inline int smi_check_local_smp(struct ib_mad_agent *mad_agent,
+                                     struct ib_smp *smp)
+{
+       /* C14-9:3 -- We're at the end of the DR segment of path */
+       /* C14-9:4 -- Hop Pointer = Hop Count + 1 -> give to SMA/SM */
+       return ((mad_agent->device->process_mad &&
+               !ib_get_smp_direction(smp) &&
+               (smp->hop_ptr == smp->hop_cnt + 1)));
+}
+
+#endif /* __SMI_H_ */


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