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s390/qeth: be drop monitor friendly 

As part of the TX completion path, qeth_release_skbs() frees the completed
skbs with __skb_queue_purge(). This ends in kfree_skb(), reporting every
completed skb as dropped.
On the other hand when dropping an skb in .ndo_start_xmit, we end up
calling consume_skb()... where we should be using kfree_skb() so that
drop monitors get notified.

Switch the drop/consume logic around, and also don't accumulate dropped
packets in the tx_errors statistics.

Fixes: dc149e3764 ("s390/qeth: replace open-coded skb_queue_walk()")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-03-18 16:40:56 +01:00 committed by David S. Miller
parent 7221b727f0
commit 104b48592b
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/s390/net/qeth_core_main.c
View File

@ -1150,13 +1150,16 @@ static void qeth_notify_skbs(struct qeth_qdio_out_q *q,
static void qeth_release_skbs(struct qeth_qdio_out_buffer *buf)
{
struct sk_buff *skb;
/* release may never happen from within CQ tasklet scope */
WARN_ON_ONCE(atomic_read(&buf->state) == QETH_QDIO_BUF_IN_CQ);
if (atomic_read(&buf->state) == QETH_QDIO_BUF_PENDING)
qeth_notify_skbs(buf->q, buf, TX_NOTIFY_GENERALERROR);
__skb_queue_purge(&buf->skb_list);
while ((skb = __skb_dequeue(&buf->skb_list)) != NULL)
consume_skb(skb);
}
static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,

3
drivers/s390/net/qeth_l2_main.c
View File

@ -629,8 +629,7 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
} /* else fall through */
QETH_TXQ_STAT_INC(queue, tx_dropped);
QETH_TXQ_STAT_INC(queue, tx_errors);
dev_kfree_skb_any(skb);
kfree_skb(skb);
netif_wake_queue(dev);
return NETDEV_TX_OK;
}

3
drivers/s390/net/qeth_l3_main.c
View File

@ -2096,8 +2096,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
tx_drop:
QETH_TXQ_STAT_INC(queue, tx_dropped);
QETH_TXQ_STAT_INC(queue, tx_errors);
dev_kfree_skb_any(skb);
kfree_skb(skb);
netif_wake_queue(dev);
return NETDEV_TX_OK;
}