[v3] app/dma-perf: fix physical address seg-fault
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Commit Message
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 uses VA address and not PA.
This fix invokes `rte_pktmbuf_mtod` for both src and dst.
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>
Suggested-by: Anoob Joseph <anoobj@marvell.com>
Suggested-by: Jerin Jacob <jerinj@marvell.com>
---
v2:
- suggest use of pktmbuf_mtod for both va and pa by Anoob.
V3:
- add const to src suggested by Jerin.
---
app/test-dma-perf/benchmark.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
Comments
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
On 2023/10/19 12:16, Vipin Varghese wrote:
> 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 uses VA address and not PA.
>
> This fix invokes `rte_pktmbuf_mtod` for both src and dst.
>
> 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>
> Suggested-by: Anoob Joseph <anoobj@marvell.com>
> Suggested-by: Jerin Jacob <jerinj@marvell.com>
>
> ---
...
@@ -288,10 +288,11 @@ do_cpu_mem_copy(void *p)
while (1) {
for (i = 0; i < nr_buf; i++) {
+ const void *src = rte_pktmbuf_mtod(dsts[i], void *);
+ void *dst = rte_pktmbuf_mtod(srcs[i], void *);
+
/* 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);
+ rte_memcpy(dst, src, (size_t)buf_size);
worker_info->total_cpl++;
}
if (worker_info->stop_flag)