Enrico Mioso <mrkiko...@gmail.com> writes:
> Kevin - it works! the key seems to be in the tx_fixup function; there is a
> special handling for frames effectively.
> Please ... help me backport those changes to the standard Linux driver - it
> will be a gain for us all, and in general you'll have a more probable
> maintenance than you would with the driver from huawei.
Very interesting. The NCM code in the huawei driver has a different
origin, so it is quite different and not too easy to merge into the
existing Linux cdc_ncm driver.
But this does pinpoint differences we should explore. One is the
placement of the NDP: The Huawei driver puts it at the end. Another,
which is much easier to test out quickly, is the sequence numbering: The
Huawei driver doesn't use it.
So I wonder if this makes any difference:
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 80a844e0ae03..37f11770acb6 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -1049,7 +1049,7 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff
*skb, __le32 sign)
nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out,
sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
nth16->wHeaderLength = cpu_to_le16(sizeof(struct
usb_cdc_ncm_nth16));
- nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
+// nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
/* count total number of frames in this NTB */
ctx->tx_curr_frame_num = 0;
Bjørn
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