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authorJim Baxter <jim_baxter@mentor.com>2014-07-07 18:33:18 +0100
committerFelipe Balbi <balbi@ti.com>2014-07-10 08:49:38 -0500
commit6d3865f9d41f15ddbcecaa6722871fc0db21d7ab (patch)
tree2f4ed7cce199a98fadc042403d6f0088fff3f0a1 /drivers/usb/gadget/u_ether.h
parent370af734dfaf8336b496b386e194648e097e248a (diff)
usb: gadget: NCM: Add transmit multi-frame.
This adds multi-frame support to the NCM NTB's for the gadget driver. This allows multiple network packets to be put inside a single USB NTB with a maximum size of 16kB. It has a time out of 300ms to ensure that smaller number of packets still maintain a normal latency. Also the .fp_index and .next_fp_index have been changed to .ndp_index and .next_ndp_index to match the latest CDC-NCM specification and help with maintenance. Results transmitting from gadget to host. Before the change: TCP_STREAM Throughput (10^6bits/sec): 22.72 UDP_STREAM Throughput (10^6bits/sec): 25.94 Latency: netperf -H 192.168.1.101 -v2 -l 50 -t TCP_RR -- -r 16384,16384 Trans. RoundTrip Throughput Rate Latency 10^6bits/s per sec usec/Tran Outbound 100.83 9918.116 13.215 After the change: TCP_STREAM Throughput (10^6bits/sec): 124.26 UDP_STREAM Throughput (10^6bits/sec): 227.48 Latency: netperf -H 192.168.1.101 -v2 -l 50 -t TCP_RR -- -r 16384,16384 Trans. RoundTrip Throughput Rate Latency 10^6bits/s per sec usec/Tran Outbound 156.80 6377.730 20.552 Signed-off-by: Jim Baxter <jim_baxter@mentor.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget/u_ether.h')
-rw-r--r--drivers/usb/gadget/u_ether.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/gadget/u_ether.h b/drivers/usb/gadget/u_ether.h
index 0f0290acea7e..334b38947916 100644
--- a/drivers/usb/gadget/u_ether.h
+++ b/drivers/usb/gadget/u_ether.h
@@ -18,6 +18,7 @@
#include <linux/if_ether.h>
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
+#include <linux/netdevice.h>
#include "gadget_chips.h"
@@ -74,6 +75,7 @@ struct gether {
bool is_fixed;
u32 fixed_out_len;
u32 fixed_in_len;
+ bool supports_multi_frame;
struct sk_buff *(*wrap)(struct gether *port,
struct sk_buff *skb);
int (*unwrap)(struct gether *port,