kernel: backport upstream usbnet fix (fixes #19455)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 45621

diff --git a/target/linux/generic/patches-3.18/082-usbnet-Fix-tx_packets-stat-for-FLAG_MULTI_FRAME-driv.patch b/target/linux/generic/patches-3.18/082-usbnet-Fix-tx_packets-stat-for-FLAG_MULTI_FRAME-driv.patch
new file mode 100644 (file)
index 0000000..2a5e08b
--- /dev/null
+++ b/target/linux/generic/patches-3.18/082-usbnet-Fix-tx_packets-stat-for-FLAG_MULTI_FRAME-driv.patch
@@ -0,0 +1,107 @@
+From: Ben Hutchings <ben.hutchings@codethink.co.uk>
+Date: Thu, 26 Feb 2015 19:34:37 +0000
+Subject: [PATCH] usbnet: Fix tx_packets stat for FLAG_MULTI_FRAME drivers
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Currently the usbnet core does not update the tx_packets statistic for
+drivers with FLAG_MULTI_PACKET and there is no hook in the TX
+completion path where they could do this.
+
+cdc_ncm and dependent drivers are bumping tx_packets stat on the
+transmit path while asix and sr9800 aren't updating it at all.
+
+Add a packet count in struct skb_data so these drivers can fill it
+in, initialise it to 1 for other drivers, and add the packet count
+to the tx_packets statistic on completion.
+
+Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
+Tested-by: Bjørn Mork <bjorn@mork.no>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+
+--- a/drivers/net/usb/asix_common.c
++++ b/drivers/net/usb/asix_common.c
+@@ -188,6 +188,8 @@ struct sk_buff *asix_tx_fixup(struct usb
+               memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
+               skb_put(skb, sizeof(padbytes));
+       }
++
++      usbnet_set_skb_tx_stats(skb, 1);
+       return skb;
+ }
+ 
+--- a/drivers/net/usb/cdc_ncm.c
++++ b/drivers/net/usb/cdc_ncm.c
+@@ -1172,7 +1172,6 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev
+ 
+       /* return skb */
+       ctx->tx_curr_skb = NULL;
+-      dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
+ 
+       /* keep private stats: framing overhead and number of NTBs */
+       ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
+@@ -1184,6 +1183,8 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev
+        */
+       dev->net->stats.tx_bytes -= skb_out->len - ctx->tx_curr_frame_payload;
+ 
++      usbnet_set_skb_tx_stats(skb_out, n);
++
+       return skb_out;
+ 
+ exit_no_skb:
+--- a/drivers/net/usb/sr9800.c
++++ b/drivers/net/usb/sr9800.c
+@@ -144,6 +144,7 @@ static struct sk_buff *sr_tx_fixup(struc
+               skb_put(skb, sizeof(padbytes));
+       }
+ 
++      usbnet_set_skb_tx_stats(skb, 1);
+       return skb;
+ }
+ 
+--- a/drivers/net/usb/usbnet.c
++++ b/drivers/net/usb/usbnet.c
+@@ -1189,8 +1189,7 @@ static void tx_complete (struct urb *urb
+       struct usbnet           *dev = entry->dev;
+ 
+       if (urb->status == 0) {
+-              if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
+-                      dev->net->stats.tx_packets++;
++              dev->net->stats.tx_packets += entry->packets;
+               dev->net->stats.tx_bytes += entry->length;
+       } else {
+               dev->net->stats.tx_errors++;
+@@ -1349,6 +1348,8 @@ netdev_tx_t usbnet_start_xmit (struct sk
+                       urb->transfer_flags |= URB_ZERO_PACKET;
+       }
+       entry->length = urb->transfer_buffer_length = length;
++      if (!(info->flags & FLAG_MULTI_PACKET))
++              usbnet_set_skb_tx_stats(skb, 1);
+ 
+       spin_lock_irqsave(&dev->txq.lock, flags);
+       retval = usb_autopm_get_interface_async(dev->intf);
+--- a/include/linux/usb/usbnet.h
++++ b/include/linux/usb/usbnet.h
+@@ -228,8 +228,20 @@ struct skb_data { /* skb->cb is one of t
+       struct usbnet           *dev;
+       enum skb_state          state;
+       size_t                  length;
++      unsigned long           packets;
+ };
+ 
++/* Drivers that set FLAG_MULTI_PACKET must call this in their
++ * tx_fixup method before returning an skb.
++ */
++static inline void
++usbnet_set_skb_tx_stats(struct sk_buff *skb, unsigned long packets)
++{
++      struct skb_data *entry = (struct skb_data *) skb->cb;
++
++      entry->packets = packets;
++}
++
+ extern int usbnet_open(struct net_device *net);
+ extern int usbnet_stop(struct net_device *net);
+ extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb,