Commit 81a36e1c authored by Changpeng Liu's avatar Changpeng Liu
Browse files

spdk: show error message when no DMA channel found 



We will check the DMA channel count which associated with kernel
ioatdma driver, and print the error message when no DMA channel
found.

Change-Id: I1d24108acb8fc6ee0c8f6041072e2dd528f55b24
Signed-off-by: default avatarChangpeng Liu <changpeng.liu@intel.com>
parent 97601bb3

examples/ioat/kperf/ioat_kperf.c

+34 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <dirent.h>

#include <inttypes.h>

#include <assert.h>
@@ -148,6 +149,29 @@ get_u64_from_file(const char *sysfs_file, uint64_t *value) 
	return 0;

}



static int

get_dma_channel_count(void)

{

	int count = 0;

	struct dirent *e;

	DIR *dir;

	char *str;



	dir = opendir("/sys/bus/pci/drivers/ioatdma");

	if (dir == NULL) {

		return 0;

	}



	while ((e = readdir(dir)) != NULL) {

		str = strstr(e->d_name, ":");

		if (str != NULL)

			count++;

	}

	closedir(dir);



	return count;

}



static void

usage(char *program_name)

{
@@ -164,6 +188,7 @@ int main(int argc, char *argv[]) 
	int op;

	int rc;

	char buf[BUFSIZ];

	uint32_t count = 0;

	uint32_t i, threads = 0;

	uint32_t ring_size, queue_depth = 0;

	uint32_t transfer_size, order = 0;
@@ -181,6 +206,11 @@ int main(int argc, char *argv[]) 
			" run `insmod dmaperf.ko` in the kmod directory\n");

		return -1;

	}

	count = get_dma_channel_count();

	if (!count) {

		fprintf(stderr, "No DMA channel found\n");

		return -1;

	}



	rc = get_u32_from_file("/sys/module/ioatdma/parameters/ioat_ring_alloc_order",

			       &order);
@@ -194,6 +224,10 @@ int main(int argc, char *argv[]) 
		switch (op) {

		case 'n':

			threads = atoi(optarg);

			if (threads > count) {

				fprintf(stderr, "Error: Total channel count %u\n", count);

				return -1;

			}

			rc = put_u32_to_file("/sys/kernel/debug/dmaperf/dmaperf/threads", threads);

			if (rc < 0) {

				fprintf(stderr, "Cannot set dma channels\n");