Re: [dpdk-dev] [PATCH v2 01/20] crypto/cnxk: add driver skeleton

[David Marchand <david.marchand@redhat.com>]

Hello,

On Thu, Jul 8, 2021 at 10:15 PM David Marchand
<david.marchand@redhat.com> wrote:
> - Reproduced the issue in Ubuntu 18.04 GHA vms:
>
> FAILED: drivers/rte_crypto_cnxk.pmd.c
> /usr/bin/python3 ../buildtools/gen-pmdinfo-cfile.py
> /home/runner/work/dpdk/dpdk/build/buildtools ar
> /home/runner/work/dpdk/dpdk/build/drivers/libtmp_rte_crypto_cnxk.a
> drivers/rte_crypto_cnxk.pmd.c /usr/bin/python3
> ../buildtools/pmdinfogen.py elf
> Traceback (most recent call last):
> File "../buildtools/pmdinfogen.py", line 274, in <module>
> main()
> File "../buildtools/pmdinfogen.py", line 269, in main
> drivers = load_drivers(image)
> File "../buildtools/pmdinfogen.py", line 203, in load_drivers
> drivers.append(Driver.load(image, symbol))
> File "../buildtools/pmdinfogen.py", line 157, in load
> driver.pci_ids = cls._load_pci_ids(image, pci_table_name_symbol)
> File "../buildtools/pmdinfogen.py", line 177, in _load_pci_ids
> pci_id = rte_pci_id.from_buffer_copy(data)
> ValueError: Buffer size too small (4 instead of at least 12 bytes)

I spent some time trying to understand this error, there is probably
multiple bug(s) somewhere between pyelftools/ctype/pmdinfogen.

In any case, on my f32, before
https://git.dpdk.org/dpdk/commit/?id=b146c30d3c0e (that hides the
issue), with a more "recent" pyelftools + python than Ubuntu 18.04, I
can see:

$ cat $HOME/builds/build-clang-shared/drivers/rte_crypto_cnxk.pmd.c
static __attribute__((unused)) const char *generator =
"../../dpdk/buildtools/pmdinfogen.py";
const char crypto_cn9k_pmd_info[] __attribute__((used)) =
"PMD_INFO_STRING= {\"name\": \"crypto_cn9k\", \"kmod\": \"vfio-pci\",
\"pci_ids\": [[10272, 25926, 28516, 24946], [11824, 11569, 11827,
25446]]}";
const char crypto_cn10k_pmd_info[] __attribute__((used)) =
"PMD_INFO_STRING= {\"name\": \"crypto_cn10k\", \"kmod\": \"vfio-pci\",
\"pci_ids\": [[6013, 41203, 65535, 65535]]}";

$ nm -S /home/dmarchan/builds/build-clang-shared/drivers/librte_crypto_cnxk.so
|grep cpt_table
000000000001d400 0000000000000018 b pci_id_cpt_table
000000000001d2f0 0000000000000018 d pci_id_cpt_table

You'll notice the former is located in bss.

$ hexdump -s $(($(printf "%d" 0x000000000001d400) - $(printf "%d"
0x1000))) -n $(printf "%d" 0x18)
/home/dmarchan/builds/build-clang-shared/drivers/librte_crypto_cnxk.so
001c400 6e61 2067 6576 7372 6f69 206e 3031 302e
001c410 312e 2820 6546 6f64
001c418

$ hexdump -s $(($(printf "%d" 0x000000000001d2f0) - $(printf "%d"
0x1000))) -n $(printf "%d" 0x18)
/home/dmarchan/builds/build-clang-shared/drivers/librte_crypto_cnxk.so
001c2f0 ffff 00ff 177d a0f3 ffff ffff 0000 0000
001c300 0000 0000 0000 0000
001c308

Those values match what the pmd.c file contains.

Are we missing a "memset()" for such symbols in pmdinfogen?
Or maybe a warning that we are adding an empty pci ids table..

There is no urgency, but if you find some time to look at this. Thanks.


-- 
David Marchand