diff mbox series

[RFC,v2,6/8] virtio/vsock: enable zerocopy callback

Message ID f969f5e1-ac1a-dbef-5838-9b197934a04d@sberdevices.ru (mailing list archive)
State RFC
Headers show
Series virtio/vsock: experimental zerocopy receive | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 1 maintainers not CCed: edumazet@google.com
netdev/build_clang fail Errors and warnings before: 13 this patch: 13
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn fail Errors and warnings before: 11 this patch: 11
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 61 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Arseniy Krasnov June 3, 2022, 5:41 a.m. UTC 
This adds zerocopy callback for virtio transport.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
 net/vmw_vsock/virtio_transport.c | 43 ++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
diff mbox series

Patch

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 19909c1e9ba3..2e05b01caa94 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -64,6 +64,7 @@  struct virtio_vsock {
 
 	u32 guest_cid;
 	bool seqpacket_allow;
+	bool zerocopy_rx_on;
 };
 
 static u32 virtio_transport_get_local_cid(void)
@@ -455,6 +456,45 @@  static void virtio_vsock_rx_done(struct virtqueue *vq)
 
 static bool virtio_transport_seqpacket_allow(u32 remote_cid);
 
+static int
+virtio_transport_zerocopy_set(struct vsock_sock *vsk, bool enable)
+{
+	struct virtio_vsock *vsock;
+
+	rcu_read_lock();
+	vsock = rcu_dereference(the_virtio_vsock);
+
+	if (!vsock) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+
+	vsock->zerocopy_rx_on = enable;
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static int
+virtio_transport_zerocopy_get(struct vsock_sock *vsk)
+{
+	struct virtio_vsock *vsock;
+	bool res;
+
+	rcu_read_lock();
+	vsock = rcu_dereference(the_virtio_vsock);
+
+	if (!vsock) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+
+	res = vsock->zerocopy_rx_on;
+	rcu_read_unlock();
+
+	return res;
+}
+
 static struct virtio_transport virtio_transport = {
 	.transport = {
 		.module                   = THIS_MODULE,
@@ -480,6 +520,9 @@  static struct virtio_transport virtio_transport = {
 		.stream_rcvhiwat          = virtio_transport_stream_rcvhiwat,
 		.stream_is_active         = virtio_transport_stream_is_active,
 		.stream_allow             = virtio_transport_stream_allow,
+		.zerocopy_dequeue         = virtio_transport_zerocopy_dequeue,
+		.rx_zerocopy_set	  = virtio_transport_zerocopy_set,
+		.rx_zerocopy_get	  = virtio_transport_zerocopy_get,
 
 		.seqpacket_dequeue        = virtio_transport_seqpacket_dequeue,
 		.seqpacket_enqueue        = virtio_transport_seqpacket_enqueue,