From ecba616e041e64840d14e294b089ca355614b7fb Mon Sep 17 00:00:00 2001 From: Thomas Falcon Date: Mon, 26 Feb 2018 18:10:55 -0600 Subject: [PATCH] ibmvnic: Fix TX descriptor tracking again Sorry, the previous change introduced a race condition between transmit completion processing and tracking TX descriptors. If a completion is received before the number of descriptors is logged, the number of descriptors will be add but not removed. After enough times, this could halt the transmit queue forever. Log the number of descriptors used by a transmit before sending. I stress tested the fix on two different systems running over the weekend without any issues. Signed-off-by: Thomas Falcon Signed-off-by: David S. Miller --- drivers/net/ethernet/ibm/ibmvnic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 5a86a916492c..32ee202de13a 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -1482,6 +1482,7 @@ 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), @@ -1500,6 +1501,7 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) (u64)tx_buff->indir_dma, (u64)num_entries); } else { + tx_buff->num_entries = num_entries; lpar_rc = send_subcrq(adapter, handle_array[queue_num], &tx_crq); } @@ -1536,7 +1538,6 @@ 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; -- 2.30.2