linux-kernel - [RFC v1 5/6] vhost/vsock: add kconfig for vhost dgram support

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Date:   Wed,  9 Jun 2021 23:24:57 +0000
From:   Jiang Wang <jiang.wang@...edance.com>
To:     sgarzare@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, stefanha@...hat.com,
        mst@...hat.com, arseny.krasnov@...persky.com,
        jhansen@...are.comments, cong.wang@...edance.com,
        duanxiongchun@...edance.com, xieyongji@...edance.com,
        chaiwen.cc@...edance.com, Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Norbert Slusarek <nslusarek@....net>,
        Colin Ian King <colin.king@...onical.com>,
        Lu Wei <luwei32@...wei.com>,
        Alexander Popov <alex.popov@...ux.com>, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC v1 5/6] vhost/vsock: add kconfig for vhost dgram support

Also change number of vqs according to the config

Signed-off-by: Jiang Wang <jiang.wang@...edance.com>
---
 drivers/vhost/Kconfig |  8 ++++++++
 drivers/vhost/vsock.c | 11 ++++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index 587fbae06182..d63fffee6007 100644
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -61,6 +61,14 @@ config VHOST_VSOCK
 	To compile this driver as a module, choose M here: the module will be called
 	vhost_vsock.
 
+config VHOST_VSOCK_DGRAM
+	bool "vhost vsock datagram sockets support"
+	depends on VHOST_VSOCK
+	default n
+	help
+	Enable vhost-vsock to support datagram types vsock.  The QEMU
+	and the guest must support datagram types too to use it.
+
 config VHOST_VDPA
 	tristate "Vhost driver for vDPA-based backend"
 	depends on EVENTFD
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index d366463be6d4..12ca1dc0268f 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -48,7 +48,11 @@ static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8);
 
 struct vhost_vsock {
 	struct vhost_dev dev;
+#ifdef CONFIG_VHOST_VSOCK_DGRAM
 	struct vhost_virtqueue vqs[4];
+#else
+	struct vhost_virtqueue vqs[2];
+#endif
 
 	/* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */
 	struct hlist_node hash;
@@ -763,15 +767,16 @@ static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
 
 	vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX];
 	vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX];
-	vqs[VSOCK_VQ_DGRAM_TX] = &vsock->vqs[VSOCK_VQ_DGRAM_TX];
-	vqs[VSOCK_VQ_DGRAM_RX] = &vsock->vqs[VSOCK_VQ_DGRAM_RX];
 	vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick;
 	vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick;
+#ifdef CONFIG_VHOST_VSOCK_DGRAM
+	vqs[VSOCK_VQ_DGRAM_TX] = &vsock->vqs[VSOCK_VQ_DGRAM_TX];
+	vqs[VSOCK_VQ_DGRAM_RX] = &vsock->vqs[VSOCK_VQ_DGRAM_RX];
 	vsock->vqs[VSOCK_VQ_DGRAM_TX].handle_kick =
 						vhost_vsock_handle_tx_kick;
 	vsock->vqs[VSOCK_VQ_DGRAM_RX].handle_kick =
 						vhost_vsock_handle_rx_kick;
-
+#endif
 	vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs),
 		       UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT,
 		       VHOST_VSOCK_WEIGHT, true, NULL);
-- 
2.11.0