Hi Thomas,
On 2023/7/7 18:40, Thomas Monjalon wrote:
> 26/05/2023 10:42, Chengwen Feng:
>> Add tracepoints at important APIs for tracing support.
>>
>> Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
>> Acked-by: Morten Brørup <m...@smartsharesystems.com>
>>
>> ---
>> v4: Fix asan smoke fail.
>> v3: Address Morten's comment:
>> Move stats_get and vchan_status and to trace_fp.h.
>> v2: Address Morten's comment:
>> Make stats_get as fast-path trace-points.
>> Place fast-path trace-point functions behind in version.map.
>
> There are more things to fix.
> First you must export rte_dmadev_trace_fp.h as it is included by rte_dmadev.h.
It was already included by rte_dmadev.h:
diff --git a/lib/dmadev/rte_dmadev.h b/lib/dmadev/rte_dmadev.h
index e61d71959e..e792b90ef8 100644
--- a/lib/dmadev/rte_dmadev.h
+++ b/lib/dmadev/rte_dmadev.h
@@ -796,6 +796,7 @@ struct rte_dma_sge {
};
#include "rte_dmadev_core.h"
+#include "rte_dmadev_trace_fp.h"
> Note: you could have caught this if testing the example app for DMA.
> Second, you must avoid structs and enum in this header file,
Let me explain the #if #endif logic:
For the function:
uint16_t
rte_dma_completed(int16_t dev_id, uint16_t vchan, const uint16_t nb_cpls,
uint16_t *last_idx, bool *has_error)
The common trace implementation:
RTE_TRACE_POINT_FP(
rte_dma_trace_completed,
RTE_TRACE_POINT_ARGS(int16_t dev_id, uint16_t vchan,
const uint16_t nb_cpls, uint16_t *last_idx,
bool *has_error, uint16_t ret),
rte_trace_point_emit_i16(dev_id);
rte_trace_point_emit_u16(vchan);
rte_trace_point_emit_u16(nb_cpls);
rte_trace_point_emit_ptr(idx_val);
rte_trace_point_emit_ptr(has_error);
rte_trace_point_emit_u16(ret);
)
But it has a problem: for pointer parameter (e.g. last_idx and has_error), only
record
the pointer value (i.e. address value).
I think the pointer value has no mean (in particular, many of there pointers
are stack
variables), the value of the pointer point to is meaningful.
So I add the pointer reference like below (as V3 did):
RTE_TRACE_POINT_FP(
rte_dma_trace_completed,
RTE_TRACE_POINT_ARGS(int16_t dev_id, uint16_t vchan,
const uint16_t nb_cpls, uint16_t *last_idx,
bool *has_error, uint16_t ret),
int has_error_val = *has_error; // pointer reference
int last_idx_val = *last_idx; // pointer reference
rte_trace_point_emit_i16(dev_id);
rte_trace_point_emit_u16(vchan);
rte_trace_point_emit_u16(nb_cpls);
rte_trace_point_emit_int(last_idx_val); // record the value of
pointer
rte_trace_point_emit_int(has_error_val); // record the value of
pointer
rte_trace_point_emit_u16(ret);
)
Unfortunately, the above lead to asan failed. because in:
RTE_TRACE_POINT_REGISTER(rte_dma_trace_completed,
lib.dmadev.completed)
it will invoke rte_dma_trace_completed() with the parameter is undefined.
To solve this problem, consider the rte_dmadev_trace_points.c will include
rte_trace_point_register.h,
and the rte_trace_point_register.h will defined macro:
_RTE_TRACE_POINT_REGISTER_H_.
so we update trace points as (as V4 did):
RTE_TRACE_POINT_FP(
rte_dma_trace_completed,
RTE_TRACE_POINT_ARGS(int16_t dev_id, uint16_t vchan,
const uint16_t nb_cpls, uint16_t *last_idx,
bool *has_error, uint16_t ret),
#ifdef _RTE_TRACE_POINT_REGISTER_H_
uint16_t __last_idx = 0;
bool __has_error = false;
last_idx = &__last_idx; // make sure the pointer has
meaningful value.
has_error = &__has_error; // so that the next pointer
reference will work well.
#endif /* _RTE_TRACE_POINT_REGISTER_H_ */
int has_error_val = *has_error;
int last_idx_val = *last_idx;
rte_trace_point_emit_i16(dev_id);
rte_trace_point_emit_u16(vchan);
rte_trace_point_emit_u16(nb_cpls);
rte_trace_point_emit_int(last_idx_val);
rte_trace_point_emit_int(has_error_val);
rte_trace_point_emit_u16(ret);
)
> otherwise it cannot be included alone.
> Look at what is done in other *_trace_fp.h files.
>
>
Whether enable_trace_fp is true or false, the v4 work well.
Below is that run examples with enable_trace_fp=true.
./dpdk-test --file-prefix=feng123 --trace=lib.dmadev.* -l 10-11
EAL: Detected CPU lcores: 96
EAL: Detected NUMA nodes: 4
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/feng123/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
APP: HPET is not enabled, using TSC as default timer
RTE>>dmadev_autotest
skeldma_probe(): Create dma_skeleton dmadev with lcore-id -1
### Test dmadev infrastructure using skeleton driver
test_dma_get_dev_id_by_name Passed
test_dma_is_valid_dev Passed
test_dma_count Passed
test_dma_info_get Passed
test_dma_configure Passed
test_dma_vchan_setup Passed
test_dma_start_stop Passed
test_dma_stats Passed
test_dma_dump Passed
test_dma_completed Passed
test_dma_completed_status Passed
Total tests : 11
Passed : 11
Failed : 0
### Test dmadev instance 0 [dma_skeleton]
DMA Dev 0: Running copy Tests
Ops submitted: 85120 Ops completed: 85120 Errors: 0
DMA Dev 0: Running stop-start Tests
Ops submitted: 1 Ops completed: 1 Errors: 0
DMA Dev 0: Running burst capacity Tests
Ops submitted: 65536 Ops completed: 65536 Errors: 0
DMA Dev 0: device does not report errors, skipping error handling tests
DMA Dev 0: No device fill support, skipping fill tests
Test OK
RTE>>
RTE>>quit
skeldma_remove(): Remove dma_skeleton dmadev
EAL: Trace dir: /root/dpdk-traces/feng123-2023-07-09-PM-06-57-08
[localhost fengchengwen]# babeltrace
/root/dpdk-traces/feng123-2023-07-09-PM-06-57-08 | grep dma | head -1
[18:54:27.066265250] (+?.?????????) lib.dmadev.copy: { cpu_id = 0xA, name =
"dpdk-test" }, { dev_id = 0, vchan = 0x0, src = 0x17F266480, dst = 0x17F292280,
length = 0x400, flags = 0x0, ret = 63340 }
[localhost fengchengwen]# babeltrace
/root/dpdk-traces/feng123-2023-07-09-PM-06-57-08 | grep completed | head -1
[18:54:27.066315770] (+0.000001670) lib.dmadev.completed: { cpu_id = 0xA, name
= "dpdk-test" }, { dev_id = 0, vchan = 0x0, nb_cpls = 0x40, last_idx_val =
63296, has_error_val = 0, ret = 0x40 }
>
> .
>
Thanks
