From patchwork Mon Mar 6 18:32:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elson Roy Serrao X-Patchwork-Id: 661596 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB589C64EC4 for ; Mon, 6 Mar 2023 18:33:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230264AbjCFSdr (ORCPT ); Mon, 6 Mar 2023 13:33:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230091AbjCFSdm (ORCPT ); Mon, 6 Mar 2023 13:33:42 -0500 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 303FB4608D; Mon, 6 Mar 2023 10:33:06 -0800 (PST) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 326DmCWC029660; Mon, 6 Mar 2023 18:32:53 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=fLxPF8eCKppWTaLwryyhSnKF0mhre4/Id5PxFMHvSGE=; b=LzXdZom8HjSviVo9sAe0I70Xi+1d5XJMNCFjfTqxOBzCo13N/S/BTuDtJa3W43/Kx8j+ RE+z4sVkgsQUpPvALuGo95KLkZsFsMdUcJXQh7US182CQliua7A68sGsvpwcFCbclTte Df/jN5wSVqbfNX2S8lv6/8+tHDoZlContE67z8leOwR9FfqCM9Br5vyKcz6TNCHL2lA3 JfhK4O2GjFWBSR3EreJVQmGmle01OazVsYOhAC0Yzwe/rsueC/He1yrjTiYWbiIpHkd/ mNpc6UBRC84jET0XZrnju3gP/VzNj2nb5iMhQxHxTCa+HnUQBr5l99sMCe9tFR4bqJWO iQ== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3p4g3mvfpe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 06 Mar 2023 18:32:53 +0000 Received: from pps.filterd (NALASPPMTA01.qualcomm.com [127.0.0.1]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 326IOAV9028193; Mon, 6 Mar 2023 18:32:51 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA01.qualcomm.com (PPS) with ESMTPS id 3p4fhbhh6f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 06 Mar 2023 18:32:51 +0000 Received: from NALASPPMTA01.qualcomm.com (NALASPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 326IWpNu006702; Mon, 6 Mar 2023 18:32:51 GMT Received: from hu-devc-lv-c.qualcomm.com (hu-eserrao-lv.qualcomm.com [10.47.235.164]) by NALASPPMTA01.qualcomm.com (PPS) with ESMTP id 326IWpRW006701; Mon, 06 Mar 2023 18:32:51 +0000 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id BEFC120E80; Mon, 6 Mar 2023 10:32:50 -0800 (PST) From: Elson Roy Serrao To: gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com, balbi@kernel.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, quic_wcheng@quicinc.com, quic_jackp@quicinc.com, Elson Roy Serrao Subject: [PATCH v6 5/5] usb: gadget: f_ecm: Add suspend/resume and remote wakeup support Date: Mon, 6 Mar 2023 10:32:48 -0800 Message-Id: <1678127568-10609-6-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1678127568-10609-1-git-send-email-quic_eserrao@quicinc.com> References: <1678127568-10609-1-git-send-email-quic_eserrao@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: raYsFSMxJ2WajhMvnukSzHXq1QlAOWnS X-Proofpoint-GUID: raYsFSMxJ2WajhMvnukSzHXq1QlAOWnS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-06_12,2023-03-06_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 mlxscore=0 clxscore=1015 adultscore=0 malwarescore=0 phishscore=0 mlxlogscore=882 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303060163 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When host sends a suspend notification to the device, handle the suspend callbacks in the function driver. Enhanced super speed devices can support function suspend feature to put the function in suspend state. Handle function suspend callback. Depending on the remote wakeup capability the device can either trigger a remote wakeup or wait for the host initiated resume to start data transfer again. Signed-off-by: Elson Roy Serrao --- drivers/usb/gadget/function/f_ecm.c | 68 +++++++++++++++++++++++++++++++++++ drivers/usb/gadget/function/u_ether.c | 63 ++++++++++++++++++++++++++++++++ drivers/usb/gadget/function/u_ether.h | 4 +++ 3 files changed, 135 insertions(+) diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c index a7ab30e..d50c1a4 100644 --- a/drivers/usb/gadget/function/f_ecm.c +++ b/drivers/usb/gadget/function/f_ecm.c @@ -633,6 +633,8 @@ static void ecm_disable(struct usb_function *f) usb_ep_disable(ecm->notify); ecm->notify->desc = NULL; + f->func_suspended = false; + f->func_wakeup_armed = false; } /*-------------------------------------------------------------------------*/ @@ -885,6 +887,68 @@ static struct usb_function_instance *ecm_alloc_inst(void) return &opts->func_inst; } +static void ecm_suspend(struct usb_function *f) +{ + struct f_ecm *ecm = func_to_ecm(f); + struct usb_composite_dev *cdev = ecm->port.func.config->cdev; + + if (f->func_suspended) { + DBG(cdev, "Function already suspended\n"); + return; + } + + DBG(cdev, "ECM Suspend\n"); + + gether_suspend(&ecm->port); +} + +static void ecm_resume(struct usb_function *f) +{ + struct f_ecm *ecm = func_to_ecm(f); + struct usb_composite_dev *cdev = ecm->port.func.config->cdev; + + /* + * If the function is in USB3 Function Suspend state, resume is + * canceled. In this case resume is done by a Function Resume request. + */ + if (f->func_suspended) + return; + + DBG(cdev, "ECM Resume\n"); + + gether_resume(&ecm->port); +} + +static int ecm_get_status(struct usb_function *f) +{ + return (f->func_wakeup_armed ? USB_INTRF_STAT_FUNC_RW : 0) | + USB_INTRF_STAT_FUNC_RW_CAP; +} + +static int ecm_func_suspend(struct usb_function *f, u8 options) +{ + struct f_ecm *ecm = func_to_ecm(f); + struct usb_composite_dev *cdev = ecm->port.func.config->cdev; + + DBG(cdev, "func susp %u cmd\n", options); + + f->func_wakeup_armed = !!(options & (USB_INTRF_FUNC_SUSPEND_RW >> 8)); + + if (options & (USB_INTRF_FUNC_SUSPEND_LP >> 8)) { + if (!f->func_suspended) { + ecm_suspend(f); + f->func_suspended = true; + } + } else { + if (f->func_suspended) { + f->func_suspended = false; + ecm_resume(f); + } + } + + return 0; +} + static void ecm_free(struct usb_function *f) { struct f_ecm *ecm; @@ -952,6 +1016,10 @@ static struct usb_function *ecm_alloc(struct usb_function_instance *fi) ecm->port.func.setup = ecm_setup; ecm->port.func.disable = ecm_disable; ecm->port.func.free_func = ecm_free; + ecm->port.func.suspend = ecm_suspend; + ecm->port.func.get_status = ecm_get_status; + ecm->port.func.func_suspend = ecm_func_suspend; + ecm->port.func.resume = ecm_resume; return &ecm->port.func; } diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c index f259975..8eba018 100644 --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -437,6 +437,20 @@ static inline int is_promisc(u16 cdc_filter) return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS; } +static int ether_wakeup_host(struct gether *port) +{ + int ret; + struct usb_function *func = &port->func; + struct usb_gadget *gadget = func->config->cdev->gadget; + + if (func->func_suspended) + ret = usb_func_wakeup(func); + else + ret = usb_gadget_wakeup(gadget); + + return ret; +} + static netdev_tx_t eth_start_xmit(struct sk_buff *skb, struct net_device *net) { @@ -456,6 +470,15 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb, in = NULL; cdc_filter = 0; } + + if (dev->port_usb->is_suspend) { + DBG(dev, "Port suspended. Triggering wakeup\n"); + netif_stop_queue(net); + spin_unlock_irqrestore(&dev->lock, flags); + ether_wakeup_host(dev->port_usb); + return NETDEV_TX_BUSY; + } + spin_unlock_irqrestore(&dev->lock, flags); if (!in) { @@ -1014,6 +1037,45 @@ int gether_set_ifname(struct net_device *net, const char *name, int len) } EXPORT_SYMBOL_GPL(gether_set_ifname); +void gether_suspend(struct gether *link) +{ + struct eth_dev *dev = link->ioport; + unsigned long flags; + + if (!dev) + return; + + if (atomic_read(&dev->tx_qlen)) { + /* + * There is a transfer in progress. So we trigger a remote + * wakeup to inform the host. + */ + ether_wakeup_host(dev->port_usb); + return; + } + spin_lock_irqsave(&dev->lock, flags); + link->is_suspend = true; + spin_unlock_irqrestore(&dev->lock, flags); +} +EXPORT_SYMBOL_GPL(gether_suspend); + +void gether_resume(struct gether *link) +{ + struct eth_dev *dev = link->ioport; + unsigned long flags; + + if (!dev) + return; + + if (netif_queue_stopped(dev->net)) + netif_start_queue(dev->net); + + spin_lock_irqsave(&dev->lock, flags); + link->is_suspend = false; + spin_unlock_irqrestore(&dev->lock, flags); +} +EXPORT_SYMBOL_GPL(gether_resume); + /* * gether_cleanup - remove Ethernet-over-USB device * Context: may sleep @@ -1176,6 +1238,7 @@ void gether_disconnect(struct gether *link) spin_lock(&dev->lock); dev->port_usb = NULL; + link->is_suspend = false; spin_unlock(&dev->lock); } EXPORT_SYMBOL_GPL(gether_disconnect); diff --git a/drivers/usb/gadget/function/u_ether.h b/drivers/usb/gadget/function/u_ether.h index 4014454..851ee10 100644 --- a/drivers/usb/gadget/function/u_ether.h +++ b/drivers/usb/gadget/function/u_ether.h @@ -79,6 +79,7 @@ struct gether { /* called on network open/close */ void (*open)(struct gether *); void (*close)(struct gether *); + bool is_suspend; }; #define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \ @@ -258,6 +259,9 @@ int gether_set_ifname(struct net_device *net, const char *name, int len); void gether_cleanup(struct eth_dev *dev); +void gether_suspend(struct gether *link); +void gether_resume(struct gether *link); + /* connect/disconnect is handled by individual functions */ struct net_device *gether_connect(struct gether *); void gether_disconnect(struct gether *);