Re: [dpdk-users] Attatching global memory pointer to mbuf and sending it to ethernet port.

[JeongHwan Kim <kjh.kernel.kr@gmail.com>]

2020년 1월 3일 (금) 오전 11:01, JeongHwan Kim <kjh.kernel.kr@gmail.com>님이 작성:

> No, I'm using only one process which contains several threads.
>
> 2020년 1월 3일 (금) 오전 10:20, Stephen Hemminger <stephen@networkplumber.org>님이
> 작성:
>
>> On Fri, 3 Jan 2020 09:11:46 +0900
>> JeongHwan Kim <kjh.kernel.kr@gmail.com> wrote:
>>
>> > Hi, everyone
>> >
>> > I'd like to send the contents of global memory through ethernet port
>> > without memory copying to mbuf.
>> > So, I attached the pointer of global memory to mbuf's buffer address,
>> but
>> > segfault occurs when I send it to ethernet port.
>> > I 'm using dpdk version 2019.11  and eal config with   "--iova-mode=pa"
>> > option.
>> > My hw platform is NXP ls2088a.
>> >
>> > My routine is like this:
>> >
>> > int buf_len = 100;
>> > struct rte_mbuf *m = rte_pktmbuf_alloc(mbuf_pool);
>> > struct rte_mbuf_ext_shared_info *shinfo =
>> > rte_pktmbuf_ext_shinfo_init_helper(buf_addr, &buf_len,  free_cb,
>> fcb_arg);
>> > rte_pktmbuf_attach_extbuf(m, buf_addr, buf_iova, buf_len, shinfo);
>> > rte_pktmbuf_reset_headroom(m);
>> > ...
>> > and sent  "m"  to ethernet, the result was
>> >
>> > Thread 4 "lcore-slave-1" received signal SIGSEGV, Segmentation fault.
>> > [Switching to Thread 0xffffbdb0c910 (LWP 10614)]
>> > 0x0000aaaaaab73f58 in eth_mbuf_to_sg_fd ()
>> >
>> > The buffer was created as follows :
>> > user_mz = rte_memzone_reserve_aligned("user_mz", size, rte_socket_id(),
>> >                     RTE_MEMZONE_1GB|RTE_MEMZONE_IOVA_CONTIG,
>> >                     RTE_CACHE_LINE_SIZE);
>> > buf_addr = user_mz->addr;
>> > buf_iova = user_mz->iova;
>> >
>> > Please give me a hint for this problem.
>> > Thanks in advance.
>> >
>> > Jeong-Hwa Kim.
>>
>> Are you using primary/secondary process model?
>> Is the memory zone being created in the primary process?
>>
>
I'm not using primary/secondary process model.
Only primary process exists and  it consists of several threads.