[PATCH] app/dma-perf: fix physical address seg-fault

[Vipin Varghese <vipin.varghese@amd.com>]

do_cpu_mem_copy uses DPDK API rte_mbuf_data_iova to return
the start of the virtual address for both src and dst.
But in case of iova mode set as PA, this results in seg-fault.
This is because rte_memcpy VA address and not PA.

this fix checks the iova mode and invokes rte_memcpy with the right
arguments.

Bugzilla ID: 1269
Fixes: 623dc9364dc6 ("app/dma-perf: introduce DMA performance test")
Cc: cheng1.jiang@intel.com

Cc: stable@dpdk.org

Signed-off-by: Vipin Varghese <vipin.varghese@amd.com>
---

tested for both va and pa

CMD:
PA: dpdk-test-dma-perf --iova-mode=pa  -- --config test.ini
VA: dpdk-test-dma-perf --iova-mode=va  -- --config test.ini
DC: dpdk-test-dma-perf --iova-mode=dc  -- --config test.ini

Log: fails for dc mode `EAL: invalid parameters for --iova-mode`

test.ini:
```
[case1]
type=CPU_MEM_COPY
mem_size=10
buf_size=64,8192,2,MUL
src_numa_node=0
dst_numa_node=0
cache_flush=0
test_seconds=2
lcore = 7
eal_args=--in-memory --no-pci
```
---
 app/test-dma-perf/benchmark.c | 39 +++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/app/test-dma-perf/benchmark.c b/app/test-dma-perf/benchmark.c
index 0601e0d171..5573acc9f9 100644
--- a/app/test-dma-perf/benchmark.c
+++ b/app/test-dma-perf/benchmark.c
@@ -279,6 +279,10 @@ do_cpu_mem_copy(void *p)
 	struct rte_mbuf **srcs = para->srcs;
 	struct rte_mbuf **dsts = para->dsts;
 	uint32_t i;
+	bool isAddrPaMode = false;
+
+	if (rte_eal_iova_mode() == RTE_IOVA_PA)
+		isAddrPaMode = true;
 
 	worker_info->stop_flag = false;
 	worker_info->ready_flag = true;
@@ -286,16 +290,33 @@ do_cpu_mem_copy(void *p)
 	while (!worker_info->start_flag)
 		;
 
-	while (1) {
-		for (i = 0; i < nr_buf; i++) {
-			/* copy buffer form src to dst */
-			rte_memcpy((void *)(uintptr_t)rte_mbuf_data_iova(dsts[i]),
-				(void *)(uintptr_t)rte_mbuf_data_iova(srcs[i]),
-				(size_t)buf_size);
-			worker_info->total_cpl++;
+	if (true == isAddrPaMode) {
+		while (1) {
+			for (i = 0; i < nr_buf; i++) {
+				void *src = rte_pktmbuf_mtod(dsts[i], void *);
+				void *dst = rte_pktmbuf_mtod(srcs[i], void *);
+
+				/* copy buffer form src to dst */
+				rte_memcpy(dst,
+					src,
+					(size_t)buf_size);
+				worker_info->total_cpl++;
+			}
+			if (worker_info->stop_flag)
+				break;
+		}
+	} else {
+		while (1) {
+			for (i = 0; i < nr_buf; i++) {
+				/* copy buffer form src to dst */
+				rte_memcpy((void *)(uintptr_t)rte_mbuf_data_iova(dsts[i]),
+					(void *)(uintptr_t)rte_mbuf_data_iova(srcs[i]),
+					(size_t)buf_size);
+				worker_info->total_cpl++;
+			}
+			if (worker_info->stop_flag)
+				break;
 		}
-		if (worker_info->stop_flag)
-			break;
 	}
 
 	return 0;
-- 
2.34.1