linux-kernel - [PATCH 2/2] hv_netvsc: Print value of invalid ID in netvsc_send_{completion,tx

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Date:   Thu,  7 Apr 2022 06:40:34 +0200
From:   "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
To:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Martin Petersen <martin.petersen@...cle.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-hyperv@...r.kernel.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
Subject: [PATCH 2/2] hv_netvsc: Print value of invalid ID in netvsc_send_{completion,tx_complete}()

That being useful for debugging purposes.

Notice that the packet descriptor is in "private" guest memory, so
that Hyper-V can not tamper with it.

While at it, remove two unnecessary u64-casts.

Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
---
 drivers/net/hyperv/netvsc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 9442f751ad3aa..4061af5baaea3 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -792,9 +792,9 @@ static void netvsc_send_tx_complete(struct net_device *ndev,
 	int queue_sends;
 	u64 cmd_rqst;
 
-	cmd_rqst = channel->request_addr_callback(channel, (u64)desc->trans_id);
+	cmd_rqst = channel->request_addr_callback(channel, desc->trans_id);
 	if (cmd_rqst == VMBUS_RQST_ERROR) {
-		netdev_err(ndev, "Incorrect transaction id\n");
+		netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
 		return;
 	}
 
@@ -854,9 +854,9 @@ static void netvsc_send_completion(struct net_device *ndev,
 	/* First check if this is a VMBUS completion without data payload */
 	if (!msglen) {
 		cmd_rqst = incoming_channel->request_addr_callback(incoming_channel,
-								   (u64)desc->trans_id);
+								   desc->trans_id);
 		if (cmd_rqst == VMBUS_RQST_ERROR) {
-			netdev_err(ndev, "Invalid transaction id\n");
+			netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
 			return;
 		}
 
-- 
2.25.1