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

[JeongHwan Kim]

No, I'm using only one process which contains several threads.

2020년 1월 3일 (금) 오전 10:20, Stephen Hemminger <stephen at networkplumber.org>님이
작성:

> On Fri, 3 Jan 2020 09:11:46 +0900
> JeongHwan Kim <kjh.kernel.kr at 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?
>