Date: Sun, 1 Jun 2014 22:51:19 +0800 From: "dongshan" <thomasyang1206@126.com> To: <net@freebsd.org> Subject: problem of netmap running on PowerPC platform board Message-ID: <006501cf7da8$f2f23110$d8d69330$@126.com>
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Hi,
very good work you have done, thank you for sharing the source code of
netmap.
These days I am trying to test netmap performance on PowerPC 32 bit board,
followed the guide, I rebuilt the kernel and netmap modules, then I tested
pkt-gen. when configured it as RX mode, it seems work fine. But when I test
the TX mode, segmentation fault error occurs. Am sure the procedures I did
was right, as I followed the procedures as what I did on X86 platform.
Here is the info:
root@p4080ds:~/netmap_modules# ./pkt-gen -i eth0 -f tx -n 500111222 -l 60 -w
10
886.299155 main [1624] interface is eth0
886.299712 extract_ip_range [275] range is 10.0.0.1:0 to 10.0.0.1:0
886.299731 extract_ip_range [275] range is 10.1.0.1:0 to 10.1.0.1:0
886.517024 main [1807] mapped 334980KB at 0x48003000
Sending on netmap:eth0: 1 queues, 1 threads and 1 cpus.
10.0.0.1 -> 10.1.0.1 (00:00:00:00:00:00 -> ff:ff:ff:ff:ff:ff)
886.517087 main [1885] Sending 512 packets every 0.000000000 s
886.517099 main [1887] Wait 10 secs for phy reset
896.517259 main [1889] Ready...
896.517293 nm_open [457] overriding ifname eth0 ringid 0x0 flags 0x1
896.517428 sender_body [996] start
Segmentation fault
After carefully debugging, I found where the error occurs. In pkt-gen.c
file, line 691:
.
} else if (options & OPT_MEMCPY) {
memcpyu(frame, p, size);
if ( fcnt == nfrags)
.
The 'p' address in the code is out of range of the mmap(). Then I traced it
and found the root error but I don't know how to correct it. I used GDB to
debug the code, in netmap_user.h file: 525, I added info of r->ofs as:
.
for(i = 0; i <+ d->req.nr_tx_rings, i++) {
struct netmap_ring *r = NETMAP_TXRING(d->nifp, i);
D("TX%d %p h %d c %d t %d ofs 0x%lx", i, r, r->head, r->cur, r->tail,
r->buf_ofs);
}
.
The red is what I added. It outcomes the 'ofs' is 0x8000000, however 0x800
is expected.
The board I tested is PowerPC big endian 32 bit board, kernel: linux 3.8. I
am not whether it effects the outcome.
Best regards,
Dongshan
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