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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Stefano Garzarella <sgarzare@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
	netdev@vger.kernel.org, Sasha Levin <sashal@kernel.org>,
	linux-hyperv@vger.kernel.org,
	Stephen Hemminger <sthemmin@microsoft.com>,
	kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
	Dexuan Cui <decui@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	"David S. Miller" <davem@davemloft.net>,
	Jorgen Hansen <jhansen@vmware.com>
Subject: Re: [RFC PATCH 07/13] vsock: handle buffer_size sockopts in the core
Date: Fri, 11 Oct 2019 09:27:14 +0100
Message-ID: <20191011082714.GF12360@stefanha-x1.localdomain> (raw)
In-Reply-To: <20191010093254.aluys4hpsfcepb42@steredhat>

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On Thu, Oct 10, 2019 at 11:32:54AM +0200, Stefano Garzarella wrote:
> On Wed, Oct 09, 2019 at 01:30:26PM +0100, Stefan Hajnoczi wrote:
> > On Fri, Sep 27, 2019 at 01:26:57PM +0200, Stefano Garzarella wrote:
> > Another issue is that this patch drops the VIRTIO_VSOCK_MAX_BUF_SIZE
> > limit that used to be enforced by virtio_transport_set_buffer_size().
> > Now the limit is only applied at socket init time.  If the buffer size
> > is changed later then VIRTIO_VSOCK_MAX_BUF_SIZE can be exceeded.  If
> > that doesn't matter, why even bother with VIRTIO_VSOCK_MAX_BUF_SIZE
> > here?
> > 
> 
> The .notify_buffer_size() should avoid this issue, since it allows the
> transport to limit the buffer size requested after the initialization.
> 
> But again the min set by the user can not be respected and in the
> previous implementation we forced it to VIRTIO_VSOCK_MAX_BUF_SIZE.
> 
> Now we don't limit the min, but we guarantee only that vsk->buffer_size
> is lower than VIRTIO_VSOCK_MAX_BUF_SIZE.
> 
> Can that be an acceptable compromise?

I think so.

Setting buffer sizes was never tested or used much by userspace
applications that I'm aware of.  We should probably include tests for
changing buffer sizes in the test suite.

Stefan

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  reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27 11:26 [RFC PATCH 00/13] vsock: add multi-transports support Stefano Garzarella
2019-09-27 11:26 ` [RFC PATCH 01/13] vsock/vmci: remove unused VSOCK_DEFAULT_CONNECT_TIMEOUT Stefano Garzarella
2019-10-09 11:41   ` Stefan Hajnoczi
2019-09-27 11:26 ` [RFC PATCH 02/13] vsock: remove vm_sockets_get_local_cid() Stefano Garzarella
2019-10-09 11:42   ` Stefan Hajnoczi
2019-09-27 11:26 ` [RFC PATCH 03/13] vsock: remove include/linux/vm_sockets.h file Stefano Garzarella
2019-10-09 11:43   ` Stefan Hajnoczi
2019-09-27 11:26 ` [RFC PATCH 04/13] vsock: add 'transport' member in the struct vsock_sock Stefano Garzarella
2019-10-09 11:46   ` Stefan Hajnoczi
2019-09-27 11:26 ` [RFC PATCH 05/13] vsock/virtio: add transport parameter to the virtio_transport_reset_no_sock() Stefano Garzarella
2019-10-09 11:52   ` Stefan Hajnoczi
2019-09-27 11:26 ` [RFC PATCH 06/13] vsock: add 'struct vsock_sock *' param to vsock_core_get_transport() Stefano Garzarella
2019-10-09 11:54   ` Stefan Hajnoczi
2019-10-10  8:50     ` Stefano Garzarella
2019-09-27 11:26 ` [RFC PATCH 07/13] vsock: handle buffer_size sockopts in the core Stefano Garzarella
2019-10-03 20:11   ` Dexuan Cui
2019-10-09 12:30   ` Stefan Hajnoczi
2019-10-10  9:32     ` Stefano Garzarella
2019-10-11  8:27       ` Stefan Hajnoczi [this message]
2019-10-11  8:51         ` Stefano Garzarella
2019-09-27 11:26 ` [RFC PATCH 08/13] vsock: move vsock_insert_unbound() in the vsock_create() Stefano Garzarella
2019-10-03 20:17   ` Dexuan Cui
2019-10-09 12:34   ` Stefan Hajnoczi
2019-10-10  9:52     ` Stefano Garzarella
2019-09-27 11:26 ` [RFC PATCH 09/13] hv_sock: set VMADDR_CID_HOST in the hvs_remote_addr_init() Stefano Garzarella
2019-10-03 19:36   ` Dexuan Cui
2019-10-09 12:35   ` Stefan Hajnoczi
2019-09-27 11:27 ` [RFC PATCH 10/13] vsock: add multi-transports support Stefano Garzarella
2019-10-09 13:11   ` Stefan Hajnoczi
2019-10-10 12:55     ` Stefano Garzarella
2019-09-27 11:27 ` [RFC PATCH 11/13] vsock: add 'transport_hg' to handle g2h\h2g transports Stefano Garzarella
2019-10-09  9:44   ` Stefano Garzarella
2019-10-09 13:16   ` Stefan Hajnoczi
2019-10-10 13:04     ` Stefano Garzarella
2019-09-27 11:27 ` [RFC PATCH 12/13] vsock: prevent transport modules unloading Stefano Garzarella
2019-10-09 13:28   ` Stefan Hajnoczi
2019-09-27 11:27 ` [RFC PATCH 13/13] vsock: fix bind() behaviour taking care of CID Stefano Garzarella
2019-10-09 13:29   ` Stefan Hajnoczi
2019-10-04  0:04 ` [RFC PATCH 00/13] vsock: add multi-transports support Dexuan Cui
2019-10-04  9:16   ` Stefano Garzarella
2019-10-09 13:29 ` Stefan Hajnoczi
2019-10-10  8:45   ` Stefano Garzarella

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