Re: [PATCH v8 4/4] app/dma-perf: add SG copy support

[fengchengwen <fengchengwen@huawei.com>]

Hi Gowrishankar,

On 2023/11/22 19:06, Gowrishankar Muthukrishnan wrote:
> Add SG copy support.
> 
> Signed-off-by: Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>
> Acked-by: Anoob Joseph <anoobj@marvell.com>
> ---
>  app/test-dma-perf/benchmark.c | 274 +++++++++++++++++++++++++++++-----
>  app/test-dma-perf/config.ini  |  19 ++-
>  app/test-dma-perf/main.c      |  34 ++++-
>  app/test-dma-perf/main.h      |   5 +-
>  4 files changed, 292 insertions(+), 40 deletions(-)
> 
> diff --git a/app/test-dma-perf/benchmark.c b/app/test-dma-perf/benchmark.c
> index 034461da4e..4530bd98ce 100644
> --- a/app/test-dma-perf/benchmark.c
> +++ b/app/test-dma-perf/benchmark.c
> @@ -46,6 +46,10 @@ struct lcore_params {
>  	uint16_t test_secs;
>  	struct rte_mbuf **srcs;
>  	struct rte_mbuf **dsts;
> +	struct rte_dma_sge *src_sges;
> +	struct rte_dma_sge *dst_sges;
> +	uint8_t src_ptrs;
> +	uint8_t dst_ptrs;
>  	volatile struct worker_info worker_info;
>  };
>  
> @@ -86,21 +90,31 @@ calc_result(uint32_t buf_size, uint32_t nr_buf, uint16_t nb_workers, uint16_t te
>  }
>  
>  static void
> -output_result(uint8_t scenario_id, uint32_t lcore_id, char *dma_name, uint16_t ring_size,
> -			uint16_t kick_batch, uint64_t ave_cycle, uint32_t buf_size, uint32_t nr_buf,
> -			float memory, float bandwidth, float mops, bool is_dma)
> +output_result(struct test_configure *cfg, struct lcore_params *para,
> +			uint16_t kick_batch, uint64_t ave_cycle, uint32_t buf_size,
> +			uint32_t nr_buf, float memory, float bandwidth, float mops)
>  {
> -	if (is_dma)
> -		printf("lcore %u, DMA %s, DMA Ring Size: %u, Kick Batch Size: %u.\n",
> -				lcore_id, dma_name, ring_size, kick_batch);
> -	else
> +	uint16_t ring_size = cfg->ring_size.cur;
> +	uint8_t scenario_id = cfg->scenario_id;
> +	uint32_t lcore_id = para->lcore_id;
> +	char *dma_name = para->dma_name;
> +
> +	if (cfg->is_dma) {
> +		printf("lcore %u, DMA %s, DMA Ring Size: %u, Kick Batch Size: %u", lcore_id,
> +		       dma_name, ring_size, kick_batch);
> +		if (cfg->is_sg)
> +			printf(" DMA src ptrs: %u, dst ptrs: %u",
> +			       para->src_ptrs, para->dst_ptrs);
> +		printf(".\n");
> +	} else {
>  		printf("lcore %u\n", lcore_id);
> +	}
>  
>  	printf("Average Cycles/op: %" PRIu64 ", Buffer Size: %u B, Buffer Number: %u, Memory: %.2lf MB, Frequency: %.3lf Ghz.\n",
>  			ave_cycle, buf_size, nr_buf, memory, rte_get_timer_hz()/1000000000.0);
>  	printf("Average Bandwidth: %.3lf Gbps, MOps: %.3lf\n", bandwidth, mops);
>  
> -	if (is_dma)
> +	if (cfg->is_dma)
>  		snprintf(output_str[lcore_id], MAX_OUTPUT_STR_LEN, CSV_LINE_DMA_FMT,
>  			scenario_id, lcore_id, dma_name, ring_size, kick_batch, buf_size,
>  			nr_buf, memory, ave_cycle, bandwidth, mops);
> @@ -167,7 +181,7 @@ vchan_data_populate(uint32_t dev_id, struct rte_dma_vchan_conf *qconf,
>  
>  /* Configuration of device. */
>  static void
> -configure_dmadev_queue(uint32_t dev_id, struct test_configure *cfg)
> +configure_dmadev_queue(uint32_t dev_id, struct test_configure *cfg, uint8_t ptrs_max)
>  {
>  	uint16_t vchan = 0;
>  	struct rte_dma_info info;
> @@ -190,6 +204,10 @@ configure_dmadev_queue(uint32_t dev_id, struct test_configure *cfg)
>  		rte_exit(EXIT_FAILURE, "Error, no configured queues reported on device id. %u\n",
>  				dev_id);
>  
> +	if (info.max_sges < ptrs_max)
> +		rte_exit(EXIT_FAILURE, "Error, DMA ptrs more than supported by device id %u.\n",
> +				dev_id);
> +
>  	if (rte_dma_start(dev_id) != 0)
>  		rte_exit(EXIT_FAILURE, "Error with dma start.\n");
>  }
> @@ -202,8 +220,12 @@ config_dmadevs(struct test_configure *cfg)
>  	uint32_t i;
>  	int dev_id;
>  	uint16_t nb_dmadevs = 0;
> +	uint8_t ptrs_max = 0;
>  	char *dma_name;
>  
> +	if (cfg->is_sg)
> +		ptrs_max = RTE_MAX(cfg->src_ptrs, cfg->dst_ptrs);
> +
>  	for (i = 0; i < ldm->cnt; i++) {
>  		dma_name = ldm->dma_names[i];
>  		dev_id = rte_dma_get_dev_id_by_name(dma_name);
> @@ -213,7 +235,7 @@ config_dmadevs(struct test_configure *cfg)
>  		}
>  
>  		ldm->dma_ids[i] = dev_id;
> -		configure_dmadev_queue(dev_id, cfg);
> +		configure_dmadev_queue(dev_id, cfg, ptrs_max);
>  		++nb_dmadevs;
>  	}
>  
> @@ -253,7 +275,7 @@ do_dma_submit_and_poll(uint16_t dev_id, uint64_t *async_cnt,
>  }
>  
>  static inline int
> -do_dma_mem_copy(void *p)
> +do_dma_plain_mem_copy(void *p)
>  {
>  	struct lcore_params *para = (struct lcore_params *)p;
>  	volatile struct worker_info *worker_info = &(para->worker_info);
> @@ -306,6 +328,65 @@ do_dma_mem_copy(void *p)
>  	return 0;
>  }
>  
> +static inline int
> +do_dma_sg_mem_copy(void *p)
> +{
> +	struct lcore_params *para = (struct lcore_params *)p;
> +	volatile struct worker_info *worker_info = &(para->worker_info);
> +	struct rte_dma_sge *src_sges = para->src_sges;
> +	struct rte_dma_sge *dst_sges = para->dst_sges;
> +	const uint16_t kick_batch = para->kick_batch;
> +	const uint8_t src_ptrs = para->src_ptrs;
> +	const uint8_t dst_ptrs = para->dst_ptrs;
> +	const uint16_t dev_id = para->dev_id;
> +	uint32_t nr_buf = para->nr_buf;
> +	uint64_t async_cnt = 0;
> +	uint32_t poll_cnt = 0;
> +	uint16_t nr_cpl;
> +	uint32_t i, j;
> +	int ret;
> +
> +	nr_buf /= RTE_MAX(src_ptrs, dst_ptrs);
> +	worker_info->stop_flag = false;
> +	worker_info->ready_flag = true;
> +
> +	while (!worker_info->start_flag)
> +		;
> +
> +	while (1) {
> +		j = 0;
> +		for (i = 0; i < nr_buf; i++) {
> +dma_copy:
> +			ret = rte_dma_copy_sg(dev_id, 0,
> +				&src_sges[i * src_ptrs], &dst_sges[j * dst_ptrs],
> +				src_ptrs, dst_ptrs, 0);
> +			if (unlikely(ret < 0)) {
> +				if (ret == -ENOSPC) {
> +					do_dma_submit_and_poll(dev_id, &async_cnt, worker_info);
> +					goto dma_copy;
> +				} else
> +					error_exit(dev_id);
> +			}
> +			async_cnt++;
> +			j++;
> +
> +			if ((async_cnt % kick_batch) == 0)
> +				do_dma_submit_and_poll(dev_id, &async_cnt, worker_info);
> +		}
> +
> +		if (worker_info->stop_flag)
> +			break;
> +	}
> +
> +	rte_dma_submit(dev_id, 0);
> +	while ((async_cnt > 0) && (poll_cnt++ < POLL_MAX)) {
> +		nr_cpl = rte_dma_completed(dev_id, 0, MAX_DMA_CPL_NB, NULL, NULL);
> +		async_cnt -= nr_cpl;
> +	}
> +
> +	return 0;
> +}
> +
>  static inline int
>  do_cpu_mem_copy(void *p)
>  {
> @@ -347,8 +428,9 @@ dummy_free_ext_buf(void *addr, void *opaque)
>  }
>  
>  static int
> -setup_memory_env(struct test_configure *cfg, struct rte_mbuf ***srcs,
> -			struct rte_mbuf ***dsts)
> +setup_memory_env(struct test_configure *cfg,
> +			 struct rte_mbuf ***srcs, struct rte_mbuf ***dsts,
> +			 struct rte_dma_sge **src_sges, struct rte_dma_sge **dst_sges)
>  {
>  	static struct rte_mbuf_ext_shared_info *ext_buf_info;
>  	unsigned int buf_size = cfg->buf_size.cur;
> @@ -443,20 +525,56 @@ setup_memory_env(struct test_configure *cfg, struct rte_mbuf ***srcs,
>  		}
>  	}
>  
> +	if (cfg->is_sg) {
> +		uint8_t src_ptrs = cfg->src_ptrs;
> +		uint8_t dst_ptrs = cfg->dst_ptrs;
> +		uint32_t sglen_src, sglen_dst;
> +
> +		*src_sges = rte_zmalloc(NULL, nr_buf * sizeof(struct rte_dma_sge),
> +					RTE_CACHE_LINE_SIZE);
> +		if (*src_sges == NULL) {
> +			printf("Error: src_sges array malloc failed.\n");
> +			return -1;
> +		}
> +
> +		*dst_sges = rte_zmalloc(NULL, nr_buf * sizeof(struct rte_dma_sge),
> +					RTE_CACHE_LINE_SIZE);
> +		if (*dst_sges == NULL) {
> +			printf("Error: dst_sges array malloc failed.\n");
> +			return -1;
> +		}
> +
> +		sglen_src = buf_size / src_ptrs;
> +		sglen_dst = buf_size / dst_ptrs;
> +
> +		for (i = 0; i < nr_buf; i++) {
> +			(*src_sges)[i].addr = rte_pktmbuf_iova((*srcs)[i]);
> +			(*src_sges)[i].length = sglen_src;
> +			if (!((i+1) % src_ptrs))
> +				(*src_sges)[i].length += (buf_size % src_ptrs);
> +
> +			(*dst_sges)[i].addr = rte_pktmbuf_iova((*dsts)[i]);
> +			(*dst_sges)[i].length = sglen_dst;
> +			if (!((i+1) % dst_ptrs))
> +				(*dst_sges)[i].length += (buf_size % dst_ptrs);
> +		}
> +	}
> +
>  	return 0;
>  }
>  
>  int
> -mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
> +mem_copy_benchmark(struct test_configure *cfg)
>  {
> -	uint32_t i;
> +	uint32_t i, j;
>  	uint32_t offset;
>  	unsigned int lcore_id = 0;
>  	struct rte_mbuf **srcs = NULL, **dsts = NULL, **m = NULL;
> +	struct rte_dma_sge *src_sges = NULL, *dst_sges = NULL;
>  	struct lcore_dma_map_t *ldm = &cfg->lcore_dma_map;
> +	const uint32_t mcore_id = rte_get_main_lcore();
>  	unsigned int buf_size = cfg->buf_size.cur;
>  	uint16_t kick_batch = cfg->kick_batch.cur;
> -	uint32_t nr_buf = cfg->nr_buf = (cfg->mem_size.cur * 1024 * 1024) / (cfg->buf_size.cur * 2);
>  	uint16_t nb_workers = ldm->cnt;
>  	uint16_t test_secs = cfg->test_secs;
>  	float memory = 0;
> @@ -464,12 +582,32 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  	uint32_t avg_cycles_total;
>  	float mops, mops_total;
>  	float bandwidth, bandwidth_total;
> +	uint32_t nr_sgsrc = 0, nr_sgdst = 0;
> +	uint32_t nr_buf;
>  	int ret = 0;
>  
> -	if (setup_memory_env(cfg, &srcs, &dsts) < 0)
> +	/* Align number of buffers according to workers count */
> +	nr_buf = (cfg->mem_size.cur * 1024 * 1024) / (cfg->buf_size.cur * 2);
> +	nr_buf -= (nr_buf % nb_workers);
> +	if (cfg->is_sg) {
> +		nr_buf /= nb_workers;
> +		nr_buf -= nr_buf % (cfg->src_ptrs * cfg->dst_ptrs);
> +		nr_buf *= nb_workers;
> +
> +		if (cfg->dst_ptrs > cfg->src_ptrs) {
> +			nr_sgsrc = (nr_buf / cfg->dst_ptrs * cfg->src_ptrs);
> +			nr_sgdst = nr_buf;
> +		} else {
> +			nr_sgsrc = nr_buf;
> +			nr_sgdst = (nr_buf / cfg->src_ptrs * cfg->dst_ptrs);
> +		}
> +	}
> +
> +	cfg->nr_buf = nr_buf;
> +	if (setup_memory_env(cfg, &srcs, &dsts, &src_sges, &dst_sges) < 0)
>  		goto out;
>  
> -	if (is_dma)
> +	if (cfg->is_dma)
>  		if (config_dmadevs(cfg) < 0)
>  			goto out;
>  
> @@ -483,13 +621,23 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  
>  	for (i = 0; i < nb_workers; i++) {
>  		lcore_id = ldm->lcores[i];
> +		if (lcore_id == mcore_id) {
> +			printf("lcore parameters can not use main core id %d\n", mcore_id);
> +			goto out;
> +		}
> +
> +		if (rte_eal_lcore_role(lcore_id) == ROLE_OFF) {
> +			printf("lcore parameters can not use offline core id %d\n", lcore_id);
> +			goto out;
> +		}
> +
>  		offset = nr_buf / nb_workers * i;
>  		lcores[i] = rte_malloc(NULL, sizeof(struct lcore_params), 0);
>  		if (lcores[i] == NULL) {
>  			printf("lcore parameters malloc failure for lcore %d\n", lcore_id);
>  			break;
>  		}
> -		if (is_dma) {
> +		if (cfg->is_dma) {
>  			lcores[i]->dma_name = ldm->dma_names[i];
>  			lcores[i]->dev_id = ldm->dma_ids[i];
>  			lcores[i]->kick_batch = kick_batch;
> @@ -503,10 +651,23 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  		lcores[i]->scenario_id = cfg->scenario_id;
>  		lcores[i]->lcore_id = lcore_id;
>  
> -		if (is_dma)
> -			rte_eal_remote_launch(do_dma_mem_copy, (void *)(lcores[i]), lcore_id);
> -		else
> +		if (cfg->is_sg) {
> +			lcores[i]->src_ptrs = cfg->src_ptrs;
> +			lcores[i]->dst_ptrs = cfg->dst_ptrs;
> +			lcores[i]->src_sges = src_sges + (nr_sgsrc / nb_workers * i);
> +			lcores[i]->dst_sges = dst_sges + (nr_sgdst / nb_workers * i);
> +		}
> +
> +		if (cfg->is_dma) {
> +			if (!cfg->is_sg)
> +				rte_eal_remote_launch(do_dma_plain_mem_copy, (void *)(lcores[i]),
> +					lcore_id);
> +			else
> +				rte_eal_remote_launch(do_dma_sg_mem_copy, (void *)(lcores[i]),
> +					lcore_id);
> +		} else {
>  			rte_eal_remote_launch(do_cpu_mem_copy, (void *)(lcores[i]), lcore_id);
> +		}
>  	}
>  
>  	while (1) {
> @@ -538,13 +699,53 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  
>  	rte_eal_mp_wait_lcore();
>  
> -	for (i = 0; i < (nr_buf / nb_workers) * nb_workers; i++) {
> -		if (memcmp(rte_pktmbuf_mtod(srcs[i], void *),
> -			   rte_pktmbuf_mtod(dsts[i], void *),
> -			   cfg->buf_size.cur) != 0) {
> -			printf("Copy validation fails for buffer number %d\n", i);
> -			ret = -1;
> -			goto out;
> +	if (!cfg->is_sg) {
> +		for (i = 0; i < (nr_buf / nb_workers) * nb_workers; i++) {
> +			if (memcmp(rte_pktmbuf_mtod(srcs[i], void *),
> +					rte_pktmbuf_mtod(dsts[i], void *),
> +					cfg->buf_size.cur) != 0) {
> +				printf("Copy validation fails for buffer number %d\n", i);
> +				ret = -1;
> +				goto out;
> +			}
> +		}
> +	} else {
> +		size_t src_remsz = buf_size % cfg->src_ptrs;
> +		size_t dst_remsz = buf_size % cfg->dst_ptrs;
> +		size_t src_sz = buf_size / cfg->src_ptrs;
> +		size_t dst_sz = buf_size / cfg->dst_ptrs;
> +		uint8_t src[buf_size], dst[buf_size];
> +		uint8_t *sbuf, *dbuf, *ptr;
> +
> +		for (i = 0; i < (nr_buf / RTE_MAX(cfg->src_ptrs, cfg->dst_ptrs)); i++) {
> +			sbuf = src;
> +			dbuf = dst;
> +			ptr = NULL;
> +
> +			for (j = 0; j < cfg->src_ptrs; j++) {
> +				ptr = rte_pktmbuf_mtod(srcs[i * cfg->src_ptrs + j], uint8_t *);
> +				memcpy(sbuf, ptr, src_sz);
> +				sbuf += src_sz;
> +			}
> +
> +			if (src_remsz)
> +				memcpy(sbuf, ptr + src_sz, src_remsz);
> +
> +			for (j = 0; j < cfg->dst_ptrs; j++) {
> +				ptr = rte_pktmbuf_mtod(dsts[i * cfg->dst_ptrs + j], uint8_t *);
> +				memcpy(dbuf, ptr, dst_sz);
> +				dbuf += dst_sz;
> +			}
> +
> +			if (dst_remsz)
> +				memcpy(dbuf, ptr + dst_sz, dst_remsz);
> +
> +			if (memcmp(src, dst, buf_size) != 0) {
> +				printf("SG Copy validation fails for buffer number %d\n",
> +					i * cfg->src_ptrs);
> +				ret = -1;
> +				goto out;
> +			}
>  		}
>  	}
>  
> @@ -555,10 +756,8 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  		calc_result(buf_size, nr_buf, nb_workers, test_secs,
>  			lcores[i]->worker_info.test_cpl,
>  			&memory, &avg_cycles, &bandwidth, &mops);
> -		output_result(cfg->scenario_id, lcores[i]->lcore_id,
> -					lcores[i]->dma_name, cfg->ring_size.cur, kick_batch,
> -					avg_cycles, buf_size, nr_buf / nb_workers, memory,
> -					bandwidth, mops, is_dma);
> +		output_result(cfg, lcores[i], kick_batch, avg_cycles, buf_size,
> +			nr_buf / nb_workers, memory, bandwidth, mops);
>  		mops_total += mops;
>  		bandwidth_total += bandwidth;
>  		avg_cycles_total += avg_cycles;
> @@ -601,13 +800,20 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
>  	rte_mempool_free(dst_pool);
>  	dst_pool = NULL;
>  
> +	/* free sges for mbufs */
> +	rte_free(src_sges);
> +	src_sges = NULL;
> +
> +	rte_free(dst_sges);
> +	dst_sges = NULL;
> +
>  	/* free the worker parameters */
>  	for (i = 0; i < nb_workers; i++) {
>  		rte_free(lcores[i]);
>  		lcores[i] = NULL;
>  	}
>  
> -	if (is_dma) {
> +	if (cfg->is_dma) {
>  		for (i = 0; i < nb_workers; i++) {
>  			printf("Stopping dmadev %d\n", ldm->dma_ids[i]);
>  			rte_dma_stop(ldm->dma_ids[i]);
> diff --git a/app/test-dma-perf/config.ini b/app/test-dma-perf/config.ini
> index cddcf93c6e..f460b93414 100644
> --- a/app/test-dma-perf/config.ini
> +++ b/app/test-dma-perf/config.ini
> @@ -9,6 +9,8 @@
>  ; "buf_size" denotes the memory size of a single operation.
>  ; "dma_ring_size" denotes the dma ring buffer size. It should be must be a power of two, and between
>  ;  64 and 4096.
> +; "dma_ptrs_src" denotes number of source segments.
> +; "dma_ptrs_dst" denotes number of destination segments.

The two entry is hard to understand, I prefer src_sge_num/dst_sge_num (better names are also welcome.)
and add descript about:
1. only valid when the type is DMA_MEM_COPY
2. enable scatter-gather copy test when both are set.

Thanks.

>  ; "kick_batch" denotes the dma operation batch size, and should be greater than 1 normally.
>  
>  ; The format for variables is variable=first,last,increment,ADD|MUL.
> @@ -69,6 +71,21 @@ lcore_dma=lcore10@0000:00:04.2, lcore11@0000:00:04.3
>  eal_args=--in-memory --file-prefix=test
>  
>  [case2]
> +type=DMA_MEM_COPY
> +mem_size=10
> +buf_size=64,8192,2,MUL
> +dma_ring_size=1024
> +dma_ptrs_src=4
> +dma_ptrs_dst=1
> +kick_batch=32
> +src_numa_node=0
> +dst_numa_node=0
> +cache_flush=0
> +test_seconds=2
> +lcore_dma=lcore10@0000:00:04.2, lcore11@0000:00:04.3
> +eal_args=--in-memory --file-prefix=test
> +
> +[case3]
>  skip=1
>  type=DMA_MEM_COPY
>  direction=2
> @@ -88,7 +105,7 @@ test_seconds=2
>  lcore_dma=lcore10@0000:00:04.2, lcore11@0000:00:04.3
>  eal_args=--in-memory --file-prefix=test
>  
> -[case3]
> +[case4]
>  type=CPU_MEM_COPY
>  mem_size=10
>  buf_size=64,8192,2,MUL
> diff --git a/app/test-dma-perf/main.c b/app/test-dma-perf/main.c
> index 1d54173a9c..e81eca14e1 100644
> --- a/app/test-dma-perf/main.c
> +++ b/app/test-dma-perf/main.c
> @@ -107,10 +107,8 @@ run_test_case(struct test_configure *case_cfg)
>  
>  	switch (case_cfg->test_type) {
>  	case TEST_TYPE_DMA_MEM_COPY:
> -		ret = mem_copy_benchmark(case_cfg, true);
> -		break;
>  	case TEST_TYPE_CPU_MEM_COPY:
> -		ret = mem_copy_benchmark(case_cfg, false);
> +		ret = mem_copy_benchmark(case_cfg);
>  		break;
>  	default:
>  		printf("Unknown test type. %s\n", case_cfg->test_type_str);
> @@ -340,7 +338,8 @@ load_configs(const char *path)
>  	const char *case_type;
>  	const char *transfer_dir;
>  	const char *lcore_dma;
> -	const char *mem_size_str, *buf_size_str, *ring_size_str, *kick_batch_str;
> +	const char *mem_size_str, *buf_size_str, *ring_size_str, *kick_batch_str,
> +		*src_ptrs_str, *dst_ptrs_str;
>  	const char *skip;
>  	const char *raddr, *scoreid, *dcoreid, *vfid, *pfid;
>  	int args_nr, nb_vp;
> @@ -455,6 +454,7 @@ load_configs(const char *path)
>  			test_case->dcoreid = (uint8_t)atoi(dcoreid);
>  		}
>  
> +		test_case->is_dma = is_dma;
>  		test_case->src_numa_node = (int)atoi(rte_cfgfile_get_entry(cfgfile,
>  								section_name, "src_numa_node"));
>  		test_case->dst_numa_node = (int)atoi(rte_cfgfile_get_entry(cfgfile,
> @@ -489,6 +489,32 @@ load_configs(const char *path)
>  			} else if (args_nr == 4)
>  				nb_vp++;
>  
> +			src_ptrs_str = rte_cfgfile_get_entry(cfgfile, section_name,
> +								"dma_ptrs_src");
> +			if (src_ptrs_str != NULL) {
> +				test_case->src_ptrs = (int)atoi(rte_cfgfile_get_entry(cfgfile,
> +								section_name, "dma_ptrs_src"));
> +			}
> +
> +			dst_ptrs_str = rte_cfgfile_get_entry(cfgfile, section_name,
> +								"dma_ptrs_dst");
> +			if (dst_ptrs_str != NULL) {
> +				test_case->dst_ptrs = (int)atoi(rte_cfgfile_get_entry(cfgfile,
> +								section_name, "dma_ptrs_dst"));
> +			}
> +
> +			if ((src_ptrs_str != NULL && dst_ptrs_str == NULL) ||
> +			    (src_ptrs_str == NULL && dst_ptrs_str != NULL)) {
> +				printf("parse dma_ptrs_src, dma_ptrs_dst error in case %d.\n",
> +					i + 1);
> +				test_case->is_valid = false;
> +				continue;
> +			} else if (src_ptrs_str != NULL && dst_ptrs_str != NULL) {
> +				test_case->is_sg = true;
> +			} else {
> +				test_case->is_sg = false;
> +			}
> +
>  			kick_batch_str = rte_cfgfile_get_entry(cfgfile, section_name, "kick_batch");
>  			args_nr = parse_entry(kick_batch_str, &test_case->kick_batch);
>  			if (args_nr < 0) {
> diff --git a/app/test-dma-perf/main.h b/app/test-dma-perf/main.h
> index 7dcaa166f2..31e0bf71c9 100644
> --- a/app/test-dma-perf/main.h
> +++ b/app/test-dma-perf/main.h
> @@ -48,11 +48,14 @@ struct test_configure {
>  	uint16_t dst_numa_node;
>  	uint16_t opcode;
>  	bool is_dma;
> +	bool is_sg;
>  	struct lcore_dma_map_t lcore_dma_map;
>  	struct test_configure_entry mem_size;
>  	struct test_configure_entry buf_size;
>  	struct test_configure_entry ring_size;
>  	struct test_configure_entry kick_batch;
> +	uint8_t src_ptrs;
> +	uint8_t dst_ptrs;
>  	uint8_t cache_flush;
>  	uint32_t nr_buf;
>  	uint16_t test_secs;
> @@ -65,6 +68,6 @@ struct test_configure {
>  	uintptr_t raddr;
>  };
>  
> -int mem_copy_benchmark(struct test_configure *cfg, bool is_dma);
> +int mem_copy_benchmark(struct test_configure *cfg);
>  
>  #endif /* MAIN_H */
>