diff options
| author |   Bjørn Mork <bjorn@mork.no> | 2014-05-16 21:48:24 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-05-16 22:39:01 -0400 |
| commit | 43e4c6dfc0fd781e68f20caf563a06f5c6ece995 (patch) | |
| tree | a93b3046f1204521f36dba8c57c7ca8e0c3d8d83 /include/linux/usb | |
| parent | net: cdc_ncm: use true max dgram count for header estimates (diff) | |
| download | linux-dev-43e4c6dfc0fd781e68f20caf563a06f5c6ece995.tar.xz linux-dev-43e4c6dfc0fd781e68f20caf563a06f5c6ece995.zip | |
net: cdc_ncm: set reasonable padding limits
We pad frames larger than X to maximum size for devices which
don't need a ZLP after maximum sized frames. This allows the
device to optimize its transfers for one fixed buffer size.
X was arbitrarily set at 512 bytes regardless of real buffer
maximum, causing extreme overheads due to excessive padding of
larger tx buffers. Limit the padding to at most 3 full USB
packets, still allowing the overhead to payload ratio of 3/1.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/cdc_ncm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usb/cdc_ncm.h b/include/linux/usb/cdc_ncm.h index 60a44b8a464e..79de6724d398 100644 --- a/include/linux/usb/cdc_ncm.h +++ b/include/linux/usb/cdc_ncm.h @@ -115,6 +115,7 @@ struct cdc_ncm_ctx { u16 tx_seq; u16 rx_seq; u16 connected; + u16 min_tx_pkt; }; u8 cdc_ncm_select_altsetting(struct usb_interface *intf); |