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authorBen Hutchings <ben.hutchings@codethink.co.uk>2015-03-25 21:41:33 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-29 12:06:45 -0700
commit7a1e890e2168e33fb62d84528e996b8b4b478fea (patch)
tree2b9d47228b9d613a9934f8bddde26a6633cf748e /include
parent1e9e39f4a29857a396ac7b669d109f697f66695e (diff)
usbnet: Fix tx_bytes statistic running backward in cdc_ncm
cdc_ncm disagrees with usbnet about how much framing overhead should be counted in the tx_bytes statistics, and tries 'fix' this by decrementing tx_bytes on the transmit path. But statistics must never be decremented except due to roll-over; this will thoroughly confuse user-space. Also, tx_bytes is only incremented by usbnet in the completion path. Fix this by requiring drivers that set FLAG_MULTI_FRAME to set a tx_bytes delta along with the tx_packets count. Fixes: beeecd42c3b4 ("net: cdc_ncm/cdc_mbim: adding NCM protocol statistics") Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Bjørn Mork <bjorn@mork.no>
Diffstat (limited to 'include')
-rw-r--r--include/linux/usb/usbnet.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index ff3fb2bd0e90..6e0ce8c7b8cb 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -227,7 +227,7 @@ struct skb_data { /* skb->cb is one of these */
struct urb *urb;
struct usbnet *dev;
enum skb_state state;
- size_t length;
+ long length;
unsigned long packets;
};
@@ -235,11 +235,13 @@ struct skb_data { /* skb->cb is one of these */
* tx_fixup method before returning an skb.
*/
static inline void
-usbnet_set_skb_tx_stats(struct sk_buff *skb, unsigned long packets)
+usbnet_set_skb_tx_stats(struct sk_buff *skb,
+ unsigned long packets, long bytes_delta)
{
struct skb_data *entry = (struct skb_data *) skb->cb;
entry->packets = packets;
+ entry->length = bytes_delta;
}
extern int usbnet_open(struct net_device *net);