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dbe678f619
linux/drivers/usb/cdns3
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Frank Li dbe678f619 usb: cdns3: fix NCM gadget RX speed 20x slow than expection at iMX8QM 
At iMX8QM platform, enable NCM gadget and run 'iperf3 -s'.
At host, run 'iperf3 -V -c fe80::6863:98ff:feef:3e0%enxc6e147509498'

[  5]   0.00-1.00   sec  1.55 MBytes  13.0 Mbits/sec   90   4.18 KBytes
[  5]   1.00-2.00   sec  1.44 MBytes  12.0 Mbits/sec   75   4.18 KBytes
[  5]   2.00-3.00   sec  1.48 MBytes  12.4 Mbits/sec   75   4.18 KBytes

Expected speed should be bigger than 300Mbits/sec.

The root cause of this performance drop was found to be data corruption
happening at 4K borders in some Ethernet packets, leading to TCP
checksum errors. This corruption occurs from the position
(4K - (address & 0x7F)) to 4K. The u_ether function's allocation of
skb_buff reserves 64B, meaning all RX addresses resemble 0xXXXX0040.

Force trb_burst_size to 16 can fix this problem.

Cc: stable@vger.kernel.org
Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20230518154946.3666662-1-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-29 15:23:59 +01:00
..
cdns3-debug.h usb: cdns3: change trace event cdns3_ring() operation 2023-03-09 15:35:03 +01:00
cdns3-ep0.c usb: cdns3: Fixed incorrect gadget state 2021-07-29 14:13:02 +08:00
cdns3-gadget.c usb: cdns3: fix NCM gadget RX speed 20x slow than expection at iMX8QM 2023-05-29 15:23:59 +01:00
cdns3-gadget.h usb: cdns3: allocate TX FIFO size according to composite EP number 2022-05-19 18:14:29 +02:00
cdns3-imx.c usb: cdns3: cdns3-imx: File headers are not good candidates for kernel-doc 2021-05-27 09:43:44 +02:00
cdns3-pci-wrap.c usb: cdns3: Fix issue with using incorrect PCI device function 2023-03-16 12:43:42 +01:00
cdns3-plat.c usb: cdns3: remove dead code 2022-09-27 10:36:36 +02:00
cdns3-ti.c usb: cdns3: cdns3-ti: File headers are not good candidates for kernel-doc 2021-05-27 09:43:44 +02:00
cdns3-trace.c usb: cdns3: Change file names for cdns3 driver. 2020-12-29 12:36:13 +08:00
cdns3-trace.h usb: cdns3: change some trace event __dynamic_array() to __get_buf() 2023-03-09 15:35:03 +01:00
cdnsp-debug.h usb: cdnsp: fix cdnsp_decode_trb function to properly handle ret value 2022-01-26 13:59:20 +01:00
cdnsp-ep0.c usb: cdnsp: Fixes error: uninitialized symbol 'len' 2023-04-05 19:55:04 +02:00
cdnsp-gadget.c usb: cdnsp: : add scatter gather support for ISOC endpoint 2023-01-17 17:30:17 +01:00
cdnsp-gadget.h usb: cdnsp: : add scatter gather support for ISOC endpoint 2023-01-17 17:30:17 +01:00
cdnsp-mem.c usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init() 2021-12-03 13:57:45 +01:00
cdnsp-pci.c usb: cdnsp: changes PCI Device ID to fix conflict with CNDS3 driver 2023-03-16 12:43:58 +01:00
cdnsp-ring.c usb: cdnsp: : add scatter gather support for ISOC endpoint 2023-01-17 17:30:17 +01:00
cdnsp-trace.c usb: cdnsp: Add tracepoints for CDNSP driver 2020-12-29 12:36:13 +08:00
cdnsp-trace.h usb: cdns3: change some trace event __dynamic_array() to __get_buf() 2023-03-09 15:35:03 +01:00
core.c usb: cdns3: core: Fix a couple of incorrectly documented function names 2021-05-27 09:43:44 +02:00
core.h headers/prep: Fix non-standard header section: drivers/usb/cdns3/core.h 2022-01-05 16:17:31 +01:00
drd.c usb: cdnsp: Fix segmentation fault in cdns_lost_power function 2022-01-26 14:11:16 +01:00
drd.h usb: cdns3: add power lost support for system resume 2021-04-12 20:19:20 +08:00
gadget-export.h
host-export.h usb: cdns3: Removes xhci_cdns3_suspend_quirk from host-export.h 2020-12-29 12:36:13 +08:00
host.c usb: cdns3: host: fix endless superspeed hub port reset 2022-11-09 12:35:13 +01:00
Kconfig
Makefile usb: cdnsp: fixes undefined reference to cdns_remove 2021-01-14 09:02:00 +08:00