From: "Saini, Abhimanyu" <abhimanyu.saini@amd.com>
To: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
"abhimanyu.saini@xilinx.com" <abhimanyu.saini@xilinx.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "chenbo.xia@intel.com" <chenbo.xia@intel.com>,
"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
"stable@dpdk.org" <stable@dpdk.org>,
Vijay Kumar Srivastava <vsrivast@xilinx.com>
Subject: RE: [PATCH] common/sfc_efx/base: remove VQ index check during VQ start
Date: Tue, 12 Jul 2022 05:00:22 +0000 [thread overview]
Message-ID: <SA0PR12MB43521B18DF6EC943359BFA1AE3869@SA0PR12MB4352.namprd12.prod.outlook.com> (raw)
In-Reply-To: <422a7c97-056d-56cb-8510-efaf5257b6e2@oktetlabs.ru>
[AMD Official Use Only - General]
On 7/8/22 10:37, abhimanyu.saini@xilinx.com wrote:
> > From: Abhimanyu Saini <absaini@amd.com>
> >
> > The used/avail queue indexes are not bound by queue
> > size, because the descriptor entry index is calculated
> > by a simple modulo between queue index and queue_size
>
> "is calculated" is a bit vague since looking at the code
> I've failed to find the place where modulo operation is
> done. Don't we need to apply it these values are put
> into MCDI message?
>
The values are added to the MCDI as is and,
the modulo is performed by the hardware.
I can append the commit message to reflect the same?
> >
> > So, do not check initial used and avail queue indexes
> > against queue size because it is possible for these
> > indexes to be greater than queue size in the
> > following cases:
> > 1) The queue is created to be migrated into, or
> > 2) The client issues a qstop/qstart after running datapath
> >
> > Fixes: 4dda72dbdeab3 ("common/sfc_efx/base: add base virtio support for
> vDPA")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Abhimanyu Saini <absaini@amd.com>
> > ---
> > drivers/common/sfc_efx/base/rhead_virtio.c | 12 +-----------
> > 1 file changed, 1 insertion(+), 11 deletions(-)
> >
> > diff --git a/drivers/common/sfc_efx/base/rhead_virtio.c
> b/drivers/common/sfc_efx/base/rhead_virtio.c
> > index 335cb74..7f08717 100644
> > --- a/drivers/common/sfc_efx/base/rhead_virtio.c
> > +++ b/drivers/common/sfc_efx/base/rhead_virtio.c
> > @@ -47,14 +47,6 @@
> > goto fail2;
> > }
> >
> > - if (evvdp != NULL) {
> > - if ((evvdp->evvd_vq_cidx > evvcp->evvc_vq_size) ||
> > - (evvdp->evvd_vq_pidx > evvcp->evvc_vq_size)) {
> > - rc = EINVAL;
> > - goto fail3;
> > - }
> > - }
> > -
> > req.emr_cmd = MC_CMD_VIRTIO_INIT_QUEUE;
> > req.emr_in_buf = payload;
> > req.emr_in_length = MC_CMD_VIRTIO_INIT_QUEUE_REQ_LEN;
> > @@ -116,15 +108,13 @@
> >
> > if (req.emr_rc != 0) {
> > rc = req.emr_rc;
> > - goto fail4;
> > + goto fail3;
> > }
> >
> > evvp->evv_vi_index = vi_index;
> >
> > return (0);
> >
> > -fail4:
> > - EFSYS_PROBE(fail4);
> > fail3:
> > EFSYS_PROBE(fail3);
> > fail2:
prev parent reply other threads:[~2022-07-12 5:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-08 7:37 abhimanyu.saini
[not found] ` <SA0PR12MB43523906A4BF7F13DF9B9D0FE3829@SA0PR12MB4352.namprd12.prod.outlook.com>
2022-07-08 9:17 ` Srivastava, Vijay
2022-07-11 8:36 ` Andrew Rybchenko
2022-07-12 5:00 ` Saini, Abhimanyu [this message]
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