netdev - [PATCH net-next] ibmvnic: Fix TX descriptor tracking

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Date:   Wed, 21 Feb 2018 18:21:10 -0600
From:   Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
To:     netdev@...r.kernel.org
Cc:     jallen@...ux.vnet.ibm.com, nfont@...ux.vnet.ibm.com,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Subject: [PATCH net-next] ibmvnic: Fix TX descriptor tracking

With the recent change, transmissions that only needed
one descriptor were being missed. The result is that such
packets were tracked as outstanding transmissions but never
removed when its completion notification was received.

Fixes: ffc385b95adb ("ibmvnic: Keep track of supplementary TX descriptors")
Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 340e1ab..b3a34d9 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1478,7 +1478,6 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	if ((*hdrs >> 7) & 1) {
 		build_hdr_descs_arr(tx_buff, &num_entries, *hdrs);
 		tx_crq.v1.n_crq_elem = num_entries;
-		tx_buff->num_entries = num_entries;
 		tx_buff->indir_arr[0] = tx_crq;
 		tx_buff->indir_dma = dma_map_single(dev, tx_buff->indir_arr,
 						    sizeof(tx_buff->indir_arr),
@@ -1533,6 +1532,7 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		netif_stop_subqueue(netdev, queue_num);
 	}
 
+	tx_buff->num_entries = num_entries;
 	tx_packets++;
 	tx_bytes += skb->len;
 	txq->trans_start = jiffies;
-- 
1.8.3.1