Subject: [PATCH 32/34] hv_netvsc: Split netvsc_revoke_buf() and netvsc_teardown_gpadl()

From: Mohammed Gamal <[email-masked]>
Date: Mon, 14 May 2018 15:32:20 -0700

[ Commit 7992894c305eaf504d005529637ff8283d0a849d upstream. ]

Split each of the functions into two for each of send/recv buffers.
This will be needed in order to implement a fine-grained messaging
sequence to the host so that we accommodate the requirements of
different Windows versions

Fixes: 0ef58b0a05c12 ("hv_netvsc: change GPAD teardown order on older versions")
Signed-off-by: Mohammed Gamal <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 drivers/net/hyperv/netvsc.c | 46 +++++++++++++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index aa9b7a912c31..25fcba506ac5 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -105,11 +105,11 @@ static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
 	call_rcu(&nvdev->rcu, free_netvsc_device);
 }
 
-static void netvsc_revoke_buf(struct hv_device *device,
-			      struct netvsc_device *net_device)
+static void netvsc_revoke_recv_buf(struct hv_device *device,
+				   struct netvsc_device *net_device)
 {
-	struct nvsp_message *revoke_packet;
 	struct net_device *ndev = hv_get_drvdata(device);
+	struct nvsp_message *revoke_packet;
 	int ret;
 
 	/*
@@ -151,6 +151,14 @@ static void netvsc_revoke_buf(struct hv_device *device,
 		}
 		net_device->recv_section_cnt = 0;
 	}
+}
+
+static void netvsc_revoke_send_buf(struct hv_device *device,
+				   struct netvsc_device *net_device)
+{
+	struct net_device *ndev = hv_get_drvdata(device);
+	struct nvsp_message *revoke_packet;
+	int ret;
 
 	/* Deal with the send buffer we may have setup.
 	 * If we got a  send section size, it means we received a
@@ -194,8 +202,8 @@ static void netvsc_revoke_buf(struct hv_device *device,
 	}
 }
 
-static void netvsc_teardown_gpadl(struct hv_device *device,
-				  struct netvsc_device *net_device)
+static void netvsc_teardown_recv_gpadl(struct hv_device *device,
+				       struct netvsc_device *net_device)
 {
 	struct net_device *ndev = hv_get_drvdata(device);
 	int ret;
@@ -214,6 +222,13 @@ static void netvsc_teardown_gpadl(struct hv_device *device,
 		}
 		net_device->recv_buf_gpadl_handle = 0;
 	}
+}
+
+static void netvsc_teardown_send_gpadl(struct hv_device *device,
+				       struct netvsc_device *net_device)
+{
+	struct net_device *ndev = hv_get_drvdata(device);
+	int ret;
 
 	if (net_device->send_buf_gpadl_handle) {
 		ret = vmbus_teardown_gpadl(device->channel,
@@ -423,8 +438,10 @@ static int netvsc_init_buf(struct hv_device *device,
 	goto exit;
 
 cleanup:
-	netvsc_revoke_buf(device, net_device);
-	netvsc_teardown_gpadl(device, net_device);
+	netvsc_revoke_recv_buf(device, net_device);
+	netvsc_revoke_send_buf(device, net_device);
+	netvsc_teardown_recv_gpadl(device, net_device);
+	netvsc_teardown_send_gpadl(device, net_device);
 
 exit:
 	return ret;
@@ -554,7 +571,8 @@ void netvsc_device_remove(struct hv_device *device)
 		= rtnl_dereference(net_device_ctx->nvdev);
 	int i;
 
-	netvsc_revoke_buf(device, net_device);
+	netvsc_revoke_recv_buf(device, net_device);
+	netvsc_revoke_send_buf(device, net_device);
 
 	RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
 
@@ -569,14 +587,18 @@ void netvsc_device_remove(struct hv_device *device)
 	netdev_dbg(ndev, "net device safe to remove\n");
 
 	/* older versions require that buffer be revoked before close */
-	if (vmbus_proto_version < VERSION_WIN10)
-		netvsc_teardown_gpadl(device, net_device);
+	if (vmbus_proto_version < VERSION_WIN10) {
+		netvsc_teardown_recv_gpadl(device, net_device);
+		netvsc_teardown_send_gpadl(device, net_device);
+	}
 
 	/* Now, we can close the channel safely */
 	vmbus_close(device->channel);
 
-	if (vmbus_proto_version >= VERSION_WIN10)
-		netvsc_teardown_gpadl(device, net_device);
+	if (vmbus_proto_version >= VERSION_WIN10) {
+		netvsc_teardown_recv_gpadl(device, net_device);
+		netvsc_teardown_send_gpadl(device, net_device);
+	}
 
 	/* Release all resources */
 	free_netvsc_device_rcu(net_device);
-- 
2.14.3