[dpdk-dev] [PATCH 4/6] examples/ntb: enable an example for ntb

Ye Xiaolong xiaolong.ye at intel.com
Wed Jun 5 11:25:12 CEST 2019


On 06/05, Li, Xiaoyun wrote:
>Hi
>> > I noticed that there are two allocations, one for pkts_recv[0] and another for
>> > pkts_recv[0]->buf_addr, How about we declare
>> >
>> > 	struct rte_rawdev_buf pkts_recv[1];
>> >
>> > and allocate memory for its buf_addr
>> >
>> > 	pkts_recv[0].buf_addr = malloc(size);
>> >
>> > then we call
>> >
>> > 	rte_rawdev_dequeue_buffers(dev_id, &pkts_recv, 1, (void *)size);
>> >
>> > After that, we just need to free once.
>> >
>> > 	free(pkts_recv[0].buf_addr);
>> >
>
>Double pointer does not represent 2D arrays. Please refer to
>https://stackoverflow.com/questions/4470950/why-cant-we-use-double-pointer-to-represent-two-dimensional-arrays
>

Yes, I agree, but I don't think it is the case here.

>It will cause segment fault in enqueue/dequeue.

Hmm, have you debug it? Which line caused the segfault?

You can refer to test_rawdev_enqdeq function in skeleton_rawdev_test.c, what it
does is similar to my suggestion, and you just need one alloc/free.

Thanks,
Xiaolong

>
>I will free twice.
>
>> > >2.17.1
>> > >


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