From: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxx>
Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxx>
---
drivers/usb/gadget/u_ether.c | 11 ++++++++++-
drivers/usb/gadget/u_ether.h | 3 +++
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 84ca195..4b1daee 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -239,6 +239,8 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
size += out->maxpacket - 1;
size -= size % out->maxpacket;
+ size = max(size, dev->port_usb->fixed_out_len);
+
skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags);
if (skb == NULL) {
DBG(dev, "no rx skb\n");
@@ -577,11 +579,18 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
req->context = skb;
req->complete = tx_complete;
+ /* NCM requires no zlp if transfer is dwNtbInMaxSize */
+ if (dev->port_usb->fixed_in_len &&
+ length == dev->port_usb->fixed_in_len &&
+ (length % in->maxpacket) == 0)
+ req->zero = 0;
+ else
+ req->zero = 1;
+
/* use zlp framing on tx for strict CDC-Ether conformance,
* though any robust network rx path ignores extra padding.
* and some hardware doesn't like to write zlps.
*/
- req->zero = 1;
if (!dev->zlp && (length % in->maxpacket) == 0)
length++;
diff --git a/drivers/usb/gadget/u_ether.h b/drivers/usb/gadget/u_ether.h
index 3c8c0c9..e97c71b 100644
--- a/drivers/usb/gadget/u_ether.h
+++ b/drivers/usb/gadget/u_ether.h
@@ -62,6 +62,9 @@ struct gether {
/* hooks for added framing, as needed for RNDIS and EEM. */
u32 header_len;
+ /* NCM requires fixed size bundles */
+ u32 fixed_out_len;
+ u32 fixed_in_len;
struct sk_buff *(*wrap)(struct gether *port,
struct sk_buff *skb);
int (*unwrap)(struct gether *port,
--
1.7.0.4
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