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IB/hfi1: Add receive fault injection feature

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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>
This commit is contained in:
Don Hiatt
2017-03-20 17:26:14 -07:00
committed by Doug Ledford
parent f7b4263372
commit 0181ce31b2
6 changed files with 336 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/infiniband/hw/hfi1/trace_misc.h
View File

@@ -72,6 +72,54 @@ TRACE_EVENT(hfi1_interrupt,
__entry->src)
);
#ifdef CONFIG_FAULT_INJECTION
TRACE_EVENT(hfi1_fault_opcode,
TP_PROTO(struct rvt_qp *qp, u8 opcode),
TP_ARGS(qp, opcode),
TP_STRUCT__entry(DD_DEV_ENTRY(dd_from_ibdev(qp->ibqp.device))
__field(u32, qpn)
__field(u8, opcode)
),
TP_fast_assign(DD_DEV_ASSIGN(dd_from_ibdev(qp->ibqp.device))
__entry->qpn = qp->ibqp.qp_num;
__entry->opcode = opcode;
),
TP_printk("[%s] qpn 0x%x opcode 0x%x",
__get_str(dev), __entry->qpn, __entry->opcode)
);
TRACE_EVENT(hfi1_fault_packet,
TP_PROTO(struct hfi1_packet *packet),
TP_ARGS(packet),
TP_STRUCT__entry(DD_DEV_ENTRY(packet->rcd->ppd->dd)
__field(u64, eflags)
__field(u32, ctxt)
__field(u32, hlen)
__field(u32, tlen)
__field(u32, updegr)
__field(u32, etail)
),
TP_fast_assign(DD_DEV_ASSIGN(packet->rcd->ppd->dd);
__entry->eflags = rhf_err_flags(packet->rhf);
__entry->ctxt = packet->rcd->ctxt;
__entry->hlen = packet->hlen;
__entry->tlen = packet->tlen;
__entry->updegr = packet->updegr;
__entry->etail = rhf_egr_index(packet->rhf);
),
TP_printk(
"[%s] ctxt %d eflags 0x%llx hlen %d tlen %d updegr %d etail %d",
__get_str(dev),
__entry->ctxt,
__entry->eflags,
__entry->hlen,
__entry->tlen,
__entry->updegr,
__entry->etail
)
);
#endif
#endif /* __HFI1_TRACE_MISC_H */
#undef TRACE_INCLUDE_PATH