git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-25 00:52:45 -04:00
Code Issues Packages Projects Releases Wiki Activity

net: cdc_ncm: use true max dgram count for header estimates

Browse Source 
Many newer NCM and MBIM devices will request a maximum tx
datagram count which is much smaller than our hard-coded
absolute max. We can reduce the overhead without sacrificing
any of the simplicity for these devices, by simply using the
true negotiated count in when calculated the maximum NTH and
NDP header sizes.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork
2014-05-16 21:48:23 +02:00
committed by David S. Miller
parent 6c4e548ff3
commit 70559b8970
2 changed files with 7 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/usb/cdc_ncm.h
View File

@@ -76,15 +76,6 @@
#define CDC_NCM_TIMER_INTERVAL_MIN 5UL
#define CDC_NCM_TIMER_INTERVAL_MAX (15UL * USEC_PER_SEC)
/* The following macro defines the minimum header space */
#define CDC_NCM_MIN_HDR_SIZE \
(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
#define CDC_NCM_NDP_SIZE \
(sizeof(struct usb_cdc_ncm_ndp16) + \
(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
#define cdc_ncm_comm_intf_is_mbim(x) ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
(x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
#define cdc_ncm_data_intf_is_mbim(x) ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)
@@ -110,6 +101,7 @@ struct cdc_ncm_ctx {
atomic_t stop;
u64 timer_interval;
u32 max_ndp_size;
u32 tx_timer_pending;
u32 tx_curr_frame_num;