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Wed, 20 Jul 2022 06:06:25 +0000 From: =?utf-8?q?=C5=81ukasz_Spintzyk?= To: netdev@vger.kernel.org Cc: linux-usb@vger.kernel.org, oliver@neukum.org, kuba@kernel.org, ppd-posix@synaptics.com, Bernice.Chen@synaptics.com Subject: [PATCH v5 1/2] net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices Date: Wed, 20 Jul 2022 08:05:17 +0200 Message-Id: <20220720060518.541-1-lukasz.spintzyk@synaptics.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <4e061614-851e-0dd4-59b2-7110b1a4c339@suse.com> References: <4e061614-851e-0dd4-59b2-7110b1a4c339@suse.com> X-ClientProxiedBy: BE1P281CA0027.DEUP281.PROD.OUTLOOK.COM (2603:10a6:b10:15::18) To SJ0PR03MB6533.namprd03.prod.outlook.com (2603:10b6:a03:386::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e19eac5c-ef63-47e8-f83e-08da6a15f9fe X-MS-TrafficTypeDiagnostic: BN9PR03MB6025:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: KPIj5Web+U+3u/fvl0xwz8icKcmMqnwCESgSoFr98x+1QTmQZgvTSWIUuGFWrE/U1jmU4qQgNOkutuknDIpEjQJxuVrqfNdTE2X8uLT+0YyS7MIZ2pTAi7aNEdekbfjkz+A5kgUCzARohoV9lq1cz2GBK7YpGjDV7woxNaEAy+uLdL/auxc77//bCosYZkCtkoAU2BMAijBn6pusIwwb8m1tujp5iD8eRRtnqIgNm5Z8ysAPE7GX0i3i2R+Im67LeWP1r/vVc1+C+tl39RrK1VJewTCQFx2eqcVmheUnE2yJjwUtqNY4fsMU9nxGBL9JRqrRJ1/vd9sImDVNU17zHXVRbnWAtNPrrfLj4YZVh9CeaN3yy7Mo215i/3kaLe+0JVG1T6ooUv7ew82xsyyWBKMuqLDrTWBYpB/tQtDedhMQ1Y1XQabqe929EVz9tznm3xwTPP+9qckhInvksnpJ+nwlngtgMGf3F371N/OPdJBIxmEiH8N1dl/hBSgigP2bB32jjHMa+JSvWCpKhkYra4hxSCRl77r31NLgAV3aahtbgcRIygZm7XDD9cF5ttivkZVYKnoEeUGfAbD0ynoH/O769Xk3i2h9Q7fPR53JGFHh++bIzBtWFfZJ87jWGAcHvUgtXlLLxxt9VpmixjkBfFJiLy0x5nd/q0n/ZJeYMH+z5fztWCEjW51Ise6tfKRch9k0wg4vmpO4tkhrANyxY2MbyM1ElMJfV8R1x2CqFk4fJ2YYUo/tOrzcgPMfDjXuLOCo268z/tbh/3us7FdLa8MpH+q5hl+k3xlLxoO0JQA= X-Forefront-Antispam-Report: CIP:255.255.255.255; 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Specifically prevents device from temporary network dropouts when playing video from the web and network traffic going through is high. Signed-off-by: Dominik Czerwik Signed-off-by: Łukasz Spintzyk --- v2: Added Sign-off-by: Bernice Chen as company lawyer. v3: - Remove copyright as this is not really necessary. - Removed Sign-off-by: Bernice Chen v4: No new changes, just resubmit with changed [PATCH v4 2/2] v5: As asked by Oliver Neukum. Mark in original cdc_ncm_info description that it does not send ZLP drivers/net/usb/cdc_ncm.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index d55f59ce4a31..8d5cbda33f66 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -1892,7 +1892,7 @@ static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) } static const struct driver_info cdc_ncm_info = { - .description = "CDC NCM", + .description = "CDC NCM (NO ZLP)", .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_LINK_INTR | FLAG_ETHER, .bind = cdc_ncm_bind, @@ -1904,6 +1904,19 @@ static const struct driver_info cdc_ncm_info = { .set_rx_mode = usbnet_cdc_update_filter, }; +/* Same as cdc_ncm_info, but with FLAG_SEND_ZLP */ +static const struct driver_info cdc_ncm_zlp_info = { + .description = "CDC NCM (SEND ZLP)", + .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET + | FLAG_LINK_INTR | FLAG_ETHER | FLAG_SEND_ZLP, + .bind = cdc_ncm_bind, + .unbind = cdc_ncm_unbind, + .manage_power = usbnet_manage_power, + .status = cdc_ncm_status, + .rx_fixup = cdc_ncm_rx_fixup, + .tx_fixup = cdc_ncm_tx_fixup, +}; + /* Same as cdc_ncm_info, but with FLAG_WWAN */ static const struct driver_info wwan_info = { .description = "Mobile Broadband Network Device", @@ -2010,6 +2023,16 @@ static const struct usb_device_id cdc_devs[] = { .driver_info = (unsigned long)&wwan_info, }, + /* DisplayLink docking stations */ + { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO + | USB_DEVICE_ID_MATCH_VENDOR, + .idVendor = 0x17e9, + .bInterfaceClass = USB_CLASS_COMM, + .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, + .bInterfaceProtocol = USB_CDC_PROTO_NONE, + .driver_info = (unsigned long)&cdc_ncm_zlp_info, + }, + /* Generic CDC-NCM devices */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),