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 v2 4/4] af_vsock: Assign the vsock transport considering the vsock address flags
Date: Mon, 7 Dec 2020 11:00:16 +0100 [thread overview]
Message-ID: <20201207100016.6n5x7bd2fqvf2mmi@steredhat> (raw)
In-Reply-To: <20201204170235.84387-5-andraprs@amazon.com>
On Fri, Dec 04, 2020 at 07:02:35PM +0200, Andra Paraschiv wrote:
>The vsock flags field can be set in the connect and (listen) receive
>paths.
>
>When the vsock transport is assigned, the remote CID is used to
>distinguish between types of connection.
>
>Use the vsock flags value (in addition to the CID) from the remote
>address to decide which vsock transport to assign. For the sibling VMs
>use case, all the vsock packets need to be forwarded to the host, so
>always assign the guest->host transport if the VMADDR_FLAG_TO_HOST flag
>is set. For the other use cases, the vsock transport assignment logic is
>not changed.
>
>Changelog
>
>v1 -> v2
>
>* Use bitwise operator to check the vsock flag.
>* Use the updated "VMADDR_FLAG_TO_HOST" flag naming.
>* Merge the checks for the g2h transport assignment in one "if" block.
>
>Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
>---
> net/vmw_vsock/af_vsock.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 83d035eab0b05..66e643c3b5f85 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -421,7 +421,8 @@ static void vsock_deassign_transport(struct vsock_sock *vsk)
> * The vsk->remote_addr is used to decide which transport to use:
> * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if
> * g2h is not loaded, will use local transport;
>- * - remote CID <= VMADDR_CID_HOST will use guest->host transport;
>+ * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field
>+ * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport;
> * - remote CID > VMADDR_CID_HOST will use host->guest transport;
> */
> int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
>@@ -429,6 +430,7 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
> const struct vsock_transport *new_transport;
> struct sock *sk = sk_vsock(vsk);
> unsigned int remote_cid = vsk->remote_addr.svm_cid;
>+ unsigned short remote_flags;
> int ret;
>
> /* If the packet is coming with the source and destination CIDs higher
>@@ -443,6 +445,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
> vsk->remote_addr.svm_cid > VMADDR_CID_HOST)
> vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST;
>
>+ remote_flags = vsk->remote_addr.svm_flags;
>+
> switch (sk->sk_type) {
> case SOCK_DGRAM:
> new_transport = transport_dgram;
>@@ -450,7 +454,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
> case SOCK_STREAM:
> if (vsock_use_local_transport(remote_cid))
> new_transport = transport_local;
>- else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g)
>+ else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g ||
>+ (remote_flags & VMADDR_FLAG_TO_HOST) == VMADDR_FLAG_TO_HOST)
Maybe "remote_flags & VMADDR_FLAG_TO_HOST" should be enough, but the
patch is okay:
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
> new_transport = transport_g2h;
> else
> new_transport = transport_h2g;
>--
>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:[~2020-12-07 10:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 17:02 [PATCH net-next v2 0/4] vsock: Add flags field in the vsock address Andra Paraschiv
2020-12-04 17:02 ` [PATCH net-next v2 1/4] vm_sockets: Include flags field in the vsock address data structure Andra Paraschiv
2020-12-07 9:59 ` Stefano Garzarella
2020-12-07 19:25 ` Paraschiv, Andra-Irina
2020-12-07 21:29 ` Jakub Kicinski
2020-12-08 18:23 ` Paraschiv, Andra-Irina
2020-12-08 18:42 ` Jakub Kicinski
2020-12-09 10:48 ` Stefano Garzarella
2020-12-09 15:17 ` Paraschiv, Andra-Irina
2020-12-09 17:30 ` Jakub Kicinski
2020-12-10 15:29 ` Paraschiv, Andra-Irina
2020-12-04 17:02 ` [PATCH net-next v2 2/4] vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag Andra Paraschiv
2020-12-07 9:59 ` Stefano Garzarella
2020-12-07 19:45 ` Paraschiv, Andra-Irina
2020-12-04 17:02 ` [PATCH net-next v2 3/4] af_vsock: Set VMADDR_FLAG_TO_HOST flag on the receive path Andra Paraschiv
2020-12-07 9:59 ` Stefano Garzarella
2020-12-04 17:02 ` [PATCH net-next v2 4/4] af_vsock: Assign the vsock transport considering the vsock address flags Andra Paraschiv
2020-12-07 10:00 ` Stefano Garzarella [this message]
2020-12-07 19:51 ` Paraschiv, Andra-Irina
2020-12-07 10:05 ` [PATCH net-next v2 0/4] vsock: Add flags field in the vsock address Stefano Garzarella
2020-12-07 19:18 ` Paraschiv, Andra-Irina
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