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From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Ahern <dsahern@gmail.com>
Cc: stephen@networkplumber.org, netdev@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Subject: Re: [iproute2-next v2 4/4] vdpa: Enable user to set mtu of the vdpa device
Date: Sat, 18 Dec 2021 17:07:15 -0500	[thread overview]
Message-ID: <20211218170602-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <a38a9877-4b01-22b3-ac62-768265db0d5a@gmail.com>

On Sat, Dec 18, 2021 at 01:53:01PM -0700, David Ahern wrote:
> On 12/17/21 1:08 AM, Parav Pandit wrote:
> > @@ -204,6 +217,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa)
> >  	if (opts->present & VDPA_OPT_VDEV_MAC)
> >  		mnl_attr_put(nlh, VDPA_ATTR_DEV_NET_CFG_MACADDR,
> >  			     sizeof(opts->mac), opts->mac);
> > +	if (opts->present & VDPA_OPT_VDEV_MTU)
> > +		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MTU, opts->mtu);
> 
> Why limit the MTU to a u16? Eric for example is working on "Big TCP"
> where IPv6 can work with Jumbograms where mtu can be > 64k.
> 
> https://datatracker.ietf.org/doc/html/rfc2675

Well it's 16 bit at the virtio level, though we can extend that of
course. Making it match for now removes need for validation.
-- 
MST

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WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Ahern <dsahern@gmail.com>
Cc: Parav Pandit <parav@nvidia.com>,
	stephen@networkplumber.org, netdev@vger.kernel.org,
	virtualization@lists.linux-foundation.org, jasowang@redhat.com
Subject: Re: [iproute2-next v2 4/4] vdpa: Enable user to set mtu of the vdpa device
Date: Sat, 18 Dec 2021 17:07:15 -0500	[thread overview]
Message-ID: <20211218170602-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <a38a9877-4b01-22b3-ac62-768265db0d5a@gmail.com>

On Sat, Dec 18, 2021 at 01:53:01PM -0700, David Ahern wrote:
> On 12/17/21 1:08 AM, Parav Pandit wrote:
> > @@ -204,6 +217,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa)
> >  	if (opts->present & VDPA_OPT_VDEV_MAC)
> >  		mnl_attr_put(nlh, VDPA_ATTR_DEV_NET_CFG_MACADDR,
> >  			     sizeof(opts->mac), opts->mac);
> > +	if (opts->present & VDPA_OPT_VDEV_MTU)
> > +		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MTU, opts->mtu);
> 
> Why limit the MTU to a u16? Eric for example is working on "Big TCP"
> where IPv6 can work with Jumbograms where mtu can be > 64k.
> 
> https://datatracker.ietf.org/doc/html/rfc2675

Well it's 16 bit at the virtio level, though we can extend that of
course. Making it match for now removes need for validation.
-- 
MST


  reply	other threads:[~2021-12-18 22:07 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-17  8:08 [iproute2-next v2 0/4] vdpa tool to query and set config layout Parav Pandit via Virtualization
2021-12-17  8:08 ` Parav Pandit
2021-12-17  8:08 ` [iproute2-next v2 1/4] vdpa: Update kernel headers Parav Pandit via Virtualization
2021-12-17  8:08   ` Parav Pandit
2021-12-17  8:08 ` [iproute2-next v2 2/4] vdpa: Enable user to query vdpa device config layout Parav Pandit via Virtualization
2021-12-17  8:08   ` Parav Pandit
2021-12-17  8:08 ` [iproute2-next v2 3/4] vdpa: Enable user to set mac address of vdpa device Parav Pandit via Virtualization
2021-12-17  8:08   ` Parav Pandit
2021-12-17  8:08 ` [iproute2-next v2 4/4] vdpa: Enable user to set mtu of the " Parav Pandit via Virtualization
2021-12-17  8:08   ` Parav Pandit
2021-12-18 20:53   ` David Ahern
2021-12-18 20:53     ` David Ahern
2021-12-18 22:07     ` Michael S. Tsirkin [this message]
2021-12-18 22:07       ` Michael S. Tsirkin
2021-12-20  3:49       ` Parav Pandit via Virtualization
2021-12-20  3:49         ` Parav Pandit
2021-12-20 12:02         ` Michael S. Tsirkin
2021-12-20 12:02           ` Michael S. Tsirkin
2021-12-20 19:11           ` Parav Pandit via Virtualization
2021-12-20 19:11             ` Parav Pandit
2021-12-20 21:11             ` David Ahern
2021-12-20 21:11               ` David Ahern
2021-12-20 23:06               ` Michael S. Tsirkin
2021-12-20 23:06                 ` Michael S. Tsirkin

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