Re: [PATCH v2 4/5] tests/qtest/hd-geo-test: fix test by removing unnecessary pcie-root-port

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 26 Jun 2023 17:01:29 +0530
Ani Sinha <anisinha@redhat.com> wrote:

> > On 26-Jun-2023, at 4:45 PM, Igor Mammedov <imammedo@redhat.com> wrote:
> > 
> > On Thu, 22 Jun 2023 16:02:54 +0530
> > Ani Sinha <anisinha@redhat.com> wrote:
> >   
> >> A SCSI controller can be attached to a pcie-to-pci bridge which in turn can be
> >> attached directly to the root bus (peie.0). There is no need to attach a
> >> pcie-root-port on the root bus in order to attach the pcie-ro-pci bridge.
> >> Fix it.  
> > 
> > bridge can be both on pcie.0 or on root-port and both are valid configs.
> > So what exactly and why we are fixing here?  
> 
> If you look at the functions carefully, “br” is a pcie-root-port and “pcie.0” is a pcie-to-pci bridge.
> The bug here is that both the SCSI controller and the pcie-to-pci bridge (pcie.0) were getting attached to the same pcie-root-port. I think the intention of the author was to attach the SCSI controller to pcie-to-pci bridge.
> In any case, I do not see the reason to attach a pcie-root-port here. We can attach the pcie-to-pci bridge on the RC and then attach the SCSI controllers on the bridge.

Description of what's wrong should be in commit message
then you can follow up with a reasoning why you don't think it's worth fixing
and what you do to remedy situation.

> 
> >   
> >> 
> >> CC: mst@redhat.com
> >> CC: imammedo@redhat.com
> >> CC: Michael Labiuk <michael.labiuk@virtuozzo.com>
> >> 
> >> Signed-off-by: Ani Sinha <anisinha@redhat.com>
> >> ---
> >> tests/qtest/hd-geo-test.c | 18 ++++++++----------
> >> 1 file changed, 8 insertions(+), 10 deletions(-)
> >> 
> >> diff --git a/tests/qtest/hd-geo-test.c b/tests/qtest/hd-geo-test.c
> >> index 5aa258a2b3..d08bffad91 100644
> >> --- a/tests/qtest/hd-geo-test.c
> >> +++ b/tests/qtest/hd-geo-test.c
> >> @@ -784,14 +784,12 @@ static void test_override_scsi(void)
> >>     test_override(args, "pc", expected);
> >> }
> >> 
> >> -static void setup_pci_bridge(TestArgs *args, const char *id, const char *rootid)
> >> +static void setup_pci_bridge(TestArgs *args, const char *id)
> >> {
> >> 
> >> -    char *root, *br;
> >> -    root = g_strdup_printf("-device pcie-root-port,id=%s", rootid);
> >> -    br = g_strdup_printf("-device pcie-pci-bridge,bus=%s,id=%s", rootid, id);
> >> +    char *br;
> >> +    br = g_strdup_printf("-device pcie-pci-bridge,bus=pcie.0,id=%s", id);
> >> 
> >> -    args->argc = append_arg(args->argc, args->argv, ARGV_SIZE, root);
> >>     args->argc = append_arg(args->argc, args->argv, ARGV_SIZE, br);
> >> }
> >> 
> >> @@ -811,8 +809,8 @@ static void test_override_scsi_q35(void)
> >>     add_drive_with_mbr(args, empty_mbr, 1);
> >>     add_drive_with_mbr(args, empty_mbr, 1);
> >>     add_drive_with_mbr(args, empty_mbr, 1);
> >> -    setup_pci_bridge(args, "pcie.0", "br");
> >> -    add_scsi_controller(args, "lsi53c895a", "br", 3);
> >> +    setup_pci_bridge(args, "pcie-pci-br");
> >> +    add_scsi_controller(args, "lsi53c895a", "pcie-pci-br", 3);
> >>     add_scsi_disk(args, 0, 0, 0, 0, 0, 10000, 120, 30);
> >>     add_scsi_disk(args, 1, 0, 0, 1, 0, 9000, 120, 30);
> >>     add_scsi_disk(args, 2, 0, 0, 2, 0, 1, 0, 0);
> >> @@ -868,9 +866,9 @@ static void test_override_virtio_blk_q35(void)
> >>     };
> >>     add_drive_with_mbr(args, empty_mbr, 1);
> >>     add_drive_with_mbr(args, empty_mbr, 1);
> >> -    setup_pci_bridge(args, "pcie.0", "br");
> >> -    add_virtio_disk(args, 0, "br", 3, 10000, 120, 30);
> >> -    add_virtio_disk(args, 1, "br", 4, 9000, 120, 30);
> >> +    setup_pci_bridge(args, "pcie-pci-br");
> >> +    add_virtio_disk(args, 0, "pcie-pci-br", 3, 10000, 120, 30);
> >> +    add_virtio_disk(args, 1, "pcie-pci-br", 4, 9000, 120, 30);
> >>     test_override(args, "q35", expected);
> >> }
> >>   
> >   
>