[PATCH v3] vhost/crypto: fix build with GCC 12

[Zhang, Roy Fan]

Hi Maxime,

I know it is over Tuesday so we understand you merged the patch already.
But any suggestions? Should we raise a Bugzilla for this problem?
BTW we reverted the patch and the test finished no problem.

Regards,
Fan
> -----Original Message-----
> From: Poczatek, Jakub <jakub.poczatek at intel.com>
> Sent: Wednesday, June 22, 2022 10:02 AM
> To: Maxime Coquelin <maxime.coquelin at redhat.com>; David Marchand
> <david.marchand at redhat.com>; dev at dpdk.org
> Cc: stable at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>; Zhang, Roy Fan
> <roy.fan.zhang at intel.com>
> Subject: RE: [PATCH v3] vhost/crypto: fix build with GCC 12
> 
> Hey everyone,
> 
> When running a Virtio performance test on a VM using VHost with this patch
> applied,
> VHost gives the following error message:
> 
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_FEATURES
> > VHOST_CONFIG: (/tmp/vhost) negotiated Virtio features: 0x0
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_MEM_TABLE
> > VHOST_CONFIG: (/tmp/vhost) guest memory region size: 0x80000000
> > VHOST_CONFIG: (/tmp/vhost)       guest physical addr: 0x0
> > VHOST_CONFIG: (/tmp/vhost)       guest virtual  addr: 0x7f17c0000000
> > VHOST_CONFIG: (/tmp/vhost)       host  virtual  addr: 0x7f94c0000000
> > VHOST_CONFIG: (/tmp/vhost)       mmap addr : 0x7f94c0000000
> > VHOST_CONFIG: (/tmp/vhost)       mmap size : 0x80000000
> > VHOST_CONFIG: (/tmp/vhost)       mmap align: 0x40000000
> > VHOST_CONFIG: (/tmp/vhost)       mmap off  : 0x0
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_VRING_NUM
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_VRING_BASE
> > VHOST_CONFIG: (/tmp/vhost) vring base idx:0 last_used_idx:0
> last_avail_idx:0.
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_VRING_ADDR
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_VRING_KICK
> > VHOST_CONFIG: (/tmp/vhost) vring kick idx:0 file:37
> > VHOST_CONFIG: (/tmp/vhost) reallocated virtqueue on node 1
> > VHOST_CONFIG: (/tmp/vhost) reallocated device on node 1
> > VHOST_CONFIG: (/tmp/vhost) virtio is now ready for processing.
> > USER1: New Vhost-crypto Device /tmp/vhost, Device ID 0
> > VHOST_CONFIG: (/tmp/vhost) read message VHOST_USER_SET_VRING_CALL
> > VHOST_CONFIG: (/tmp/vhost) vring call idx:0 file:38
> > USER1: [VHOST-Crypto]: Session 1 created for vdev 0.
> > USER1: [VHOST-Crypto]: Incorrect virtio descriptor
> > USER1: [VHOST-Crypto]: Failed to process sym request
> > USER1: [VHOST-Crypto]: Incorrect virtio descriptor
> > USER1: [VHOST-Crypto]: Failed to process sym request
> 
> Due to this, performance test hangs and never finishes.
> 
> Kind Regards,
> Jakub Poczatek
> 
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Tuesday 21 June 2022 10:31
> To: David Marchand <david.marchand at redhat.com>; dev at dpdk.org
> Cc: stable at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>; Zhang, Roy Fan
> <roy.fan.zhang at intel.com>
> Subject: Re: [PATCH v3] vhost/crypto: fix build with GCC 12
> 
> 
> 
> On 6/16/22 16:46, David Marchand wrote:
> > GCC 12 raises the following warning:
> >
> > In file included from ../lib/mempool/rte_mempool.h:46,
> >                   from ../lib/mbuf/rte_mbuf.h:38,
> >                   from ../lib/vhost/vhost_crypto.c:7:
> > ../lib/vhost/vhost_crypto.c: In function ‘rte_vhost_crypto_fetch_requests’:
> > ../lib/eal/x86/include/rte_memcpy.h:371:9: warning: array subscript 1 is
> >       outside array bounds of ‘struct virtio_crypto_op_data_req[1]’
> >       [-Warray-bounds]
> >    371 | rte_mov32((uint8_t *)dst + 3 * 32, (const uint8_t *)src + 3 * 32);
> >        |
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ../lib/vhost/vhost_crypto.c:1178:42: note: while referencing ‘req’
> >   1178 |         struct virtio_crypto_op_data_req req;
> >        |                                          ^~~
> >
> > Split this function and separate the per descriptor copy.
> > This makes the code clearer, and the compiler happier.
> >
> > Note: logs for errors have been moved to callers to avoid duplicates.
> >
> > Fixes: 3c79609fda7c ("vhost/crypto: handle virtually non-contiguous buffers")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: David Marchand <david.marchand at redhat.com>
> > ---
> > Changes since v2:
> > - fixed 32-bits build,
> >
> > Changes since v1:
> > - refactored copy function,
> >
> > ---
> >   lib/vhost/vhost_crypto.c | 123 +++++++++++++++------------------------
> >   1 file changed, 46 insertions(+), 77 deletions(-)
> >
> 
> Applied to dpdk-next-virtio/main.
> 
> Thanks,
> Maxime