From patchwork Tue Aug 2 19:18:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elson Roy Serrao X-Patchwork-Id: 595495 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 1F0D3C00140 for ; Tue, 2 Aug 2022 19:20:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229684AbiHBTUD (ORCPT ); Tue, 2 Aug 2022 15:20:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230153AbiHBTTb (ORCPT ); Tue, 2 Aug 2022 15:19:31 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA7D852FD3; Tue, 2 Aug 2022 12:19:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1659467962; x=1691003962; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=dp6FpXSnj7Kdrprl3gFX+M+yxPPFELr3jMZgt5ns6iE=; b=fdjZiYAK8XL5I+q2uESOvs5zcelmrxKq2uH3ubxfdHroWqjmzLpdKl8j 8OWZwKsVXM5gK/ROJrHUOeciJfcrax9sRZkGtYMH5Cf5lgkKWyrUWyKBV W28qXxSR1MHng3szYD3mhTJPpQeQT7BLL6vqan/SDDNSA6qypO5jonAlh Y=; Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 02 Aug 2022 12:19:22 -0700 X-QCInternal: smtphost Received: from hu-eserrao-lv.qualcomm.com (HELO hu-devc-lv-c.qualcomm.com) ([10.47.235.164]) by ironmsg08-lv.qualcomm.com with ESMTP; 02 Aug 2022 12:19:23 -0700 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id 7C4D5211BE; Tue, 2 Aug 2022 12:18:42 -0700 (PDT) From: Elson Roy Serrao To: balbi@kernel.org, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, quic_wcheng@quicinc.com, quic_jackp@quicinc.com, quic_mrana@quicinc.com, Thinh.Nguyen@synopsys.com, Elson Roy Serrao Subject: [PATCH 4/5] usb: gadget: f_ecm: Add suspend/resume and remote wakeup support Date: Tue, 2 Aug 2022 12:18:39 -0700 Message-Id: <1659467920-9095-5-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1659467920-9095-1-git-send-email-quic_eserrao@quicinc.com> References: <1659467920-9095-1-git-send-email-quic_eserrao@quicinc.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When the host sends a suspend notification to the device, handle the suspend callbacks in the function driver. 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 | 22 +++++++++++ drivers/usb/gadget/function/u_ether.c | 72 +++++++++++++++++++++++++++++++++++ drivers/usb/gadget/function/u_ether.h | 4 ++ 3 files changed, 98 insertions(+) diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c index ffe2486..fb1dec3 100644 --- a/drivers/usb/gadget/function/f_ecm.c +++ b/drivers/usb/gadget/function/f_ecm.c @@ -889,6 +889,26 @@ 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; + + 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; + + DBG(cdev, "ECM Resume\n"); + + gether_resume(&ecm->port); +} + static void ecm_free(struct usb_function *f) { struct f_ecm *ecm; @@ -956,6 +976,8 @@ 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.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 7887def..78391de 100644 --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -471,6 +471,18 @@ 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 = -EOPNOTSUPP; + struct usb_function *func = &port->func; + struct usb_gadget *gadget = func->config->cdev->gadget; + + if (gadget->speed < USB_SPEED_SUPER) + ret = usb_gadget_wakeup(gadget); + + return ret; +} + static netdev_tx_t eth_start_xmit(struct sk_buff *skb, struct net_device *net) { @@ -490,6 +502,25 @@ 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"); + retval = ether_wakeup_host(dev->port_usb); + if (retval) { + /* + * Either the remote wakeup is not yet complete or + * wakeup is not supported. In either case we cannot + * send data and hence inform the upper layer to stop + * sending data. The queue is re-started in resume + * callback once the remote wakeup is successful or when + * host initiated resume happens. + */ + netif_stop_queue(net); + spin_unlock_irqrestore(&dev->lock, flags); + return NETDEV_TX_BUSY; + } + } + spin_unlock_irqrestore(&dev->lock, flags); if (!in) { @@ -1050,6 +1081,46 @@ 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; + + spin_lock_irqsave(&dev->lock, flags); + + if (netif_queue_stopped(dev->net)) + netif_start_queue(dev->net); + + 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 @@ -1212,6 +1283,7 @@ 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 *);