From: Stefano Garzarella <sgarzare@redhat.com>
To: Andra Paraschiv <andraprs@amazon.com>
Cc: netdev <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"David S . Miller" <davem@davemloft.net>,
David Duncan <davdunc@amazon.com>,
Dexuan Cui <decui@microsoft.com>, Alexander Graf <graf@amazon.de>,
Jorgen Hansen <jhansen@vmware.com>,
Jakub Kicinski <kuba@kernel.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH net-next v1 1/3] vm_sockets: Include flag field in the vsock address data structure
Date: Tue, 1 Dec 2020 17:09:37 +0100 [thread overview]
Message-ID: <20201201160937.sswd3prfn6r52ihc@steredhat> (raw)
In-Reply-To: <20201201152505.19445-2-andraprs@amazon.com>
On Tue, Dec 01, 2020 at 05:25:03PM +0200, Andra Paraschiv wrote:
>vsock enables communication between virtual machines and the host they
>are running on. With the multi transport support (guest->host and
>host->guest), nested VMs can also use vsock channels for communication.
>
>In addition to this, by default, all the vsock packets are forwarded to
>the host, if no host->guest transport is loaded. This behavior can be
>implicitly used for enabling vsock communication between sibling VMs.
>
>Add a flag field in the vsock address data structure that can be used to
>explicitly mark the vsock connection as being targeted for a certain
>type of communication. This way, can distinguish between nested VMs and
>sibling VMs use cases and can also setup them at the same time. Till
>now, could either have nested VMs or sibling VMs at a time using the
>vsock communication stack.
>
>Use the already available "svm_reserved1" field and mark it as a flag
>field instead. This flag can be set when initializing the vsock address
>variable used for the connect() call.
Maybe we can split this patch in 2 patches, one to rename the svm_flag
and one to add the new flags.
>
>Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
>---
> include/uapi/linux/vm_sockets.h | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
>diff --git a/include/uapi/linux/vm_sockets.h b/include/uapi/linux/vm_sockets.h
>index fd0ed7221645d..58da5a91413ac 100644
>--- a/include/uapi/linux/vm_sockets.h
>+++ b/include/uapi/linux/vm_sockets.h
>@@ -114,6 +114,22 @@
>
> #define VMADDR_CID_HOST 2
>
>+/* This sockaddr_vm flag value covers the current default use case:
>+ * local vsock communication between guest and host and nested VMs setup.
>+ * In addition to this, implicitly, the vsock packets are forwarded to the host
>+ * if no host->guest vsock transport is set.
>+ */
>+#define VMADDR_FLAG_DEFAULT_COMMUNICATION 0x0000
I think we don't need this macro, since the next one can be used to
check if it a sibling communication (flag 0x1 set) or not (flag 0x1
not set).
>+
>+/* Set this flag value in the sockaddr_vm corresponding field if the vsock
>+ * channel needs to be setup between two sibling VMs running on the same host.
>+ * This way can explicitly distinguish between vsock channels created for nested
>+ * VMs (or local communication between guest and host) and the ones created for
>+ * sibling VMs. And vsock channels for multiple use cases (nested / sibling VMs)
>+ * can be setup at the same time.
>+ */
>+#define VMADDR_FLAG_SIBLING_VMS_COMMUNICATION 0x0001
What do you think if we shorten in VMADDR_FLAG_SIBLING?
Thanks,
Stefano
>+
> /* Invalid vSockets version. */
>
> #define VM_SOCKETS_INVALID_VERSION -1U
>@@ -145,7 +161,7 @@
>
> struct sockaddr_vm {
> __kernel_sa_family_t svm_family;
>- unsigned short svm_reserved1;
>+ unsigned short svm_flag;
> unsigned int svm_port;
> unsigned int svm_cid;
> unsigned char svm_zero[sizeof(struct sockaddr) -
>--
>2.20.1 (Apple Git-117)
>
>
>
>
>Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.
>
next prev parent reply other threads:[~2020-12-01 16:11 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 15:25 [PATCH net-next v1 0/3] vsock: Add flag field in the vsock address Andra Paraschiv
2020-12-01 15:25 ` [PATCH net-next v1 1/3] vm_sockets: Include flag field in the vsock address data structure Andra Paraschiv
2020-12-01 16:09 ` Stefano Garzarella [this message]
2020-12-01 18:15 ` Paraschiv, Andra-Irina
2020-12-02 8:32 ` Stefano Garzarella
2020-12-03 9:21 ` Stefan Hajnoczi
2020-12-03 10:32 ` Paraschiv, Andra-Irina
2020-12-03 13:38 ` Stefano Garzarella
2020-12-03 14:04 ` Paraschiv, Andra-Irina
2020-12-01 15:25 ` [PATCH net-next v1 2/3] virtio_transport_common: Set sibling VMs flag on the receive path Andra Paraschiv
2020-12-01 16:22 ` Stefano Garzarella
2020-12-01 19:01 ` Paraschiv, Andra-Irina
2020-12-02 8:53 ` Stefano Garzarella
2020-12-01 15:25 ` [PATCH net-next v1 3/3] af_vsock: Assign the vsock transport considering the vsock address flag Andra Paraschiv
2020-12-01 16:23 ` Stefano Garzarella
2020-12-01 19:06 ` Paraschiv, Andra-Irina
2020-12-01 16:27 ` [PATCH net-next v1 0/3] vsock: Add flag field in the vsock address Stefano Garzarella
2020-12-01 18:02 ` Paraschiv, Andra-Irina
2020-12-02 13:37 ` Stefano Garzarella
2020-12-02 16:18 ` Paraschiv, Andra-Irina
2020-12-03 8:51 ` Stefano Garzarella
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