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0181ce31b2
Add fault injection capability:
- Drop packets unconditionally (fault_by_packet)
- Drop packets based on opcode (fault_by_opcode)
This feature reacts to the global FAULT_INJECTION
config flag.
The faulting traces have been added:
- misc/fault_opcode
- misc/fault_packet
See 'Documentation/fault-injection/fault-injection.txt'
for details.
Examples:
- Dropping packets by opcode:
/sys/kernel/debug/hfi1/hfi1_X/fault_opcode
# Enable fault
echo Y > fault_by_opcode
# Setprobability of dropping (0-100%)
# echo 25 > probability
# Set opcode
echo 0x64 > opcode
# Number of times to fault
echo 3 > times
# An optional mask allows you to fault
# a range of opcodes
echo 0xf0 > mask
/sys/kernel/debug/hfi1/hfi1_X/fault_stats
contains a value in parentheses to indicate
number of each opcode dropped.
- Dropping packets unconditionally
/sys/kernel/debug/hfi1/hfi1_X/fault_packet
# Enable fault
echo Y > fault_by_packet
/sys/kernel/debug/hfi1/hfi1_X/fault_packet/fault_stats
contains the number of packets dropped.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
#ifndef _HFI1_DEBUGFS_H
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#define _HFI1_DEBUGFS_H
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/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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struct hfi1_ibdev;
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#ifdef CONFIG_DEBUG_FS
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void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd);
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void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd);
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void hfi1_dbg_init(void);
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void hfi1_dbg_exit(void);
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#ifdef CONFIG_FAULT_INJECTION
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#include <linux/fault-inject.h>
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struct fault_opcode {
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struct fault_attr attr;
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struct dentry *dir;
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bool fault_by_opcode;
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u64 n_rxfaults[256];
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u64 n_txfaults[256];
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u8 opcode;
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u8 mask;
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};
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struct fault_packet {
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struct fault_attr attr;
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struct dentry *dir;
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bool fault_by_packet;
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u64 n_faults;
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};
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bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, u32 opcode, bool rx);
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bool hfi1_dbg_fault_packet(struct hfi1_packet *packet);
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#else
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static inline bool hfi1_dbg_fault_packet(struct hfi1_packet *packet)
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{
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return false;
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}
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static inline bool hfi1_dbg_fault_opcode(struct rvt_qp *qp,
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u32 opcode, bool rx)
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{
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return false;
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}
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#endif
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#else
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static inline void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
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{
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}
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static inline void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
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{
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}
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static inline void hfi1_dbg_init(void)
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{
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}
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static inline void hfi1_dbg_exit(void)
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{
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}
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static inline bool hfi1_dbg_fault_packet(struct hfi1_packet *packet)
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{
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return false;
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}
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static inline bool hfi1_dbg_fault_opcode(struct rvt_qp *qp,
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u32 opcode, bool rx)
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{
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return false;
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}
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#endif
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#endif /* _HFI1_DEBUGFS_H */
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