From patchwork Tue May 11 14:42:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 12251255 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05A4AC433ED for ; Tue, 11 May 2021 14:33:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4796613C1 for ; Tue, 11 May 2021 14:33:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231809AbhEKOec (ORCPT ); Tue, 11 May 2021 10:34:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231760AbhEKOea (ORCPT ); Tue, 11 May 2021 10:34:30 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C9C2C061574 for ; Tue, 11 May 2021 07:33:23 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id b11-20020a7bc24b0000b0290148da0694ffso1346150wmj.2 for ; Tue, 11 May 2021 07:33:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Zezgoqt0zCsoq+uBC0Vp75VtG0oU7/1H5gH0gmp1xrI=; b=kGpUCDEonFPeib3U7RBkBi/ayMuh/zQVldHg9RW6dlTSShPXtZ+ZwU7mv8PwxalWHe TPKxCEpnvoiXJKLy/vKNwF7BFl87Ta700kSKBRz6Dx3S6h62GkvW4VTolncDScZPNyGC 8JBRjUPOXEbiVcaF4YD/xfp3YSseaAVbsjj07dRex8t15EzOnOQPbC4j4z5Aa8yPt5uz P1uJD4NWhuJSGolNseWMSSmCb+G7w1vgQ1wfS+Cu2m9o0yb4gSGsIsH5hzCoprb53z0c smXqU3NfUj/AlK9aT0AKRKRbUP7GWiZJYwNNpY5Cl4NGx5w7gBdhn/pA6XBCQyyq9JCj +Z2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Zezgoqt0zCsoq+uBC0Vp75VtG0oU7/1H5gH0gmp1xrI=; b=QZfv0gO/K6G52UwynwiDrDrmdobaQZZr73FZ3BQcAb5cOzvgatKt1YDi0kr7Utm27A k3sTAAt8dSErv8sclxpym8/OI0qViDbvEGHGQUgQzxKR/osLLeMDfGdnSw7tjWCKn217 OhLPPIzAzzwfNzbxCbtIZRQ/BVM5VScwR/v1ox7lcNhBzImLXIwvlPdU3ipFfV2u7Hpl oKCjz5s/QDlV/IeOGz3mT1HPDicjQyD5nQqKtz8IrPWYO7vQzNsLPJhlEjcY5hojcLiF nLE3JdUIR1Asr0ZZVp9KFudjRh4dGPMPcPMAXXXXd5ARwXXtpTCJi0B4Rxt1EIlw7gNm jxBQ== X-Gm-Message-State: AOAM530sKjfO5HOXTMzZ52Ta+phtjTUKCuypOIiPdFXv8IzcF/aSfI4P Kdo1EBaO1oIKN5GleEp6mGVVuw== X-Google-Smtp-Source: ABdhPJyPS2QgxsXk589qMWLQLZSNhCDgM15l222IM5KK+Ppra4X0hRgqNSmZQZ2K+9T0enL2xBjf0g== X-Received: by 2002:a1c:7f4a:: with SMTP id a71mr5774948wmd.60.1620743601231; Tue, 11 May 2021 07:33:21 -0700 (PDT) Received: from localhost.localdomain ([2a01:e0a:82c:5f0:ddef:1d66:be88:86cc]) by smtp.gmail.com with ESMTPSA id j13sm27773018wrw.93.2021.05.11.07.33.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 May 2021 07:33:20 -0700 (PDT) From: Loic Poulain To: oliver@neukum.org Cc: kuba@kernel.org, davem@davemloft.net, bjorn@mork.no, netdev@vger.kernel.org, aleksander@aleksander.es, Loic Poulain Subject: [PATCH net-next v2 2/2] usb: class: cdc-wdm: WWAN framework integration Date: Tue, 11 May 2021 16:42:23 +0200 Message-Id: <1620744143-26075-2-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1620744143-26075-1-git-send-email-loic.poulain@linaro.org> References: <1620744143-26075-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The WWAN framework provides a unified way to handle WWAN/modems and its control port(s). It has initially been introduced to support MHI/PCI modems, offering the same control protocols as the USB variants such as MBIM, QMI, AT... The WWAN framework exposes these control protocols as character devices, similarly to cdc-wdm, but in a bus agnostic fashion. This change adds registration of the USB modem cdc-wdm control endpoints to the WWAN framework as standard control ports (wwanXpY...). Exposing cdc-wdm through WWAN framework normally maintains backward compatibility, e.g: $ qmicli --device-open-qmi -d /dev/wwan0p1QMI --dms-get-ids instead of $ qmicli --device-open-qmi -d /dev/cdc-wdm0 --dms-get-ids However, some tools may rely on cdc-wdm driver/device name for device detection. It is then safer to keep the 'legacy' cdc-wdm character device to prevent any breakage. This is handled in this change by API mutual exclusion, only one access method can be used at a time, either cdc-wdm chardev or WWAN API. Note that unknown channel types (other than MBIM, AT or MBIM) are not registered to the WWAN framework. Signed-off-by: Loic Poulain --- v2: - Fix pm runtime while ongoing transmission - Use WWAN port type instead of CDC specific ones - Change port_start ordering - Handle usb_submit_urb return value - Fix build issue reported by kernel-test-rebot drivers/net/usb/cdc_mbim.c | 1 + drivers/net/usb/huawei_cdc_ncm.c | 1 + drivers/net/usb/qmi_wwan.c | 3 +- drivers/usb/class/cdc-wdm.c | 180 ++++++++++++++++++++++++++++++++++++++- include/linux/usb/cdc-wdm.h | 3 +- 5 files changed, 182 insertions(+), 6 deletions(-) diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c index 5db6627..42fb750 100644 --- a/drivers/net/usb/cdc_mbim.c +++ b/drivers/net/usb/cdc_mbim.c @@ -168,6 +168,7 @@ static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf) subdriver = usb_cdc_wdm_register(ctx->control, &dev->status->desc, le16_to_cpu(ctx->mbim_desc->wMaxControlMessage), + WWAN_PORT_MBIM, cdc_mbim_wdm_manage_power); if (IS_ERR(subdriver)) { ret = PTR_ERR(subdriver); diff --git a/drivers/net/usb/huawei_cdc_ncm.c b/drivers/net/usb/huawei_cdc_ncm.c index a87f0da..849b773 100644 --- a/drivers/net/usb/huawei_cdc_ncm.c +++ b/drivers/net/usb/huawei_cdc_ncm.c @@ -96,6 +96,7 @@ static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev, subdriver = usb_cdc_wdm_register(ctx->control, &usbnet_dev->status->desc, 1024, /* wMaxCommand */ + WWAN_PORT_AT, huawei_cdc_ncm_wdm_manage_power); if (IS_ERR(subdriver)) { ret = PTR_ERR(subdriver); diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index 17a0505..11c898f 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -724,7 +724,8 @@ static int qmi_wwan_register_subdriver(struct usbnet *dev) /* register subdriver */ subdriver = usb_cdc_wdm_register(info->control, &dev->status->desc, - 4096, &qmi_wwan_cdc_wdm_manage_power); + 4096, WWAN_PORT_QMI, + &qmi_wwan_cdc_wdm_manage_power); if (IS_ERR(subdriver)) { dev_err(&info->control->dev, "subdriver registration failed\n"); rv = PTR_ERR(subdriver); diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 508b1c3..457b00c 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -21,8 +21,10 @@ #include #include #include +#include #include #include +#include #include #include #include @@ -55,6 +57,7 @@ MODULE_DEVICE_TABLE (usb, wdm_ids); #define WDM_SUSPENDING 8 #define WDM_RESETTING 9 #define WDM_OVERFLOW 10 +#define WDM_WWAN_IN_USE 11 #define WDM_MAX 16 @@ -106,6 +109,9 @@ struct wdm_device { struct list_head device_list; int (*manage_power)(struct usb_interface *, int); + + enum wwan_port_type wwanp_type; + struct wwan_port *wwanp; }; static struct usb_driver wdm_driver; @@ -157,6 +163,8 @@ static void wdm_out_callback(struct urb *urb) wake_up_all(&desc->wait); } +static void wdm_wwan_rx(struct wdm_device *desc, int length); + static void wdm_in_callback(struct urb *urb) { unsigned long flags; @@ -192,6 +200,11 @@ static void wdm_in_callback(struct urb *urb) } } + if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { + wdm_wwan_rx(desc, length); + goto out; + } + /* * only set a new error if there is no previous error. * Errors are only cleared during read/open @@ -226,6 +239,7 @@ static void wdm_in_callback(struct urb *urb) set_bit(WDM_READ, &desc->flags); wake_up(&desc->wait); } +out: spin_unlock_irqrestore(&desc->iuspin, flags); } @@ -697,6 +711,11 @@ static int wdm_open(struct inode *inode, struct file *file) goto out; file->private_data = desc; + if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { + rv = -EBUSY; + goto out; + } + rv = usb_autopm_get_interface(desc->intf); if (rv < 0) { dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); @@ -792,6 +811,151 @@ static struct usb_class_driver wdm_class = { .minor_base = WDM_MINOR_BASE, }; +/* --- WWAN framework integration --- */ +#ifdef CONFIG_WWAN +static int wdm_wwan_port_start(struct wwan_port *port) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + + /* The interface is both exposed via the WWAN framework and as a + * legacy usbmisc chardev. If chardev is already open, just fail + * to prevent concurrent usage. Otherwise, switch to WWAN mode. + */ + mutex_lock(&wdm_mutex); + if (desc->count) { + mutex_unlock(&wdm_mutex); + return -EBUSY; + } + set_bit(WDM_WWAN_IN_USE, &desc->flags); + mutex_unlock(&wdm_mutex); + + desc->manage_power(desc->intf, 1); + + /* tx is allowed */ + wwan_port_txon(port); + + /* Start getting events */ + return usb_submit_urb(desc->validity, GFP_KERNEL); +} + +static void wdm_wwan_port_stop(struct wwan_port *port) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + + /* Stop all transfers and disable WWAN mode */ + kill_urbs(desc); + desc->manage_power(desc->intf, 0); + clear_bit(WDM_READ, &desc->flags); + clear_bit(WDM_WWAN_IN_USE, &desc->flags); +} + +static void wdm_wwan_port_tx_complete(struct urb *urb) +{ + struct sk_buff *skb = urb->context; + struct wdm_device *desc = skb_shinfo(skb)->destructor_arg; + + usb_autopm_put_interface(desc->intf); + wwan_port_txon(desc->wwanp); + kfree_skb(skb); +} + +static int wdm_wwan_port_tx(struct wwan_port *port, struct sk_buff *skb) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + struct usb_interface *intf = desc->intf; + struct usb_ctrlrequest *req = desc->orq; + int rv; + + rv = usb_autopm_get_interface(intf); + if (rv) + return rv; + + usb_fill_control_urb( + desc->command, + interface_to_usbdev(intf), + usb_sndctrlpipe(interface_to_usbdev(intf), 0), + (unsigned char *)req, + skb->data, + skb->len, + wdm_wwan_port_tx_complete, + skb + ); + + req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE); + req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; + req->wValue = 0; + req->wIndex = desc->inum; + req->wLength = cpu_to_le16(skb->len); + + skb_shinfo(skb)->destructor_arg = desc; + + rv = usb_submit_urb(desc->command, GFP_KERNEL); + if (rv) + usb_autopm_put_interface(intf); + else /* One transfer at a time, stop TX until URB completion */ + wwan_port_txoff(port); + + return rv; +} + +static struct wwan_port_ops wdm_wwan_port_ops = { + .start = wdm_wwan_port_start, + .stop = wdm_wwan_port_stop, + .tx = wdm_wwan_port_tx, +}; + +static void wdm_wwan_init(struct wdm_device *desc) +{ + struct usb_interface *intf = desc->intf; + struct wwan_port *port; + + /* Only register to WWAN core if protocol/type is known */ + if (desc->wwanp_type == WWAN_PORT_UNKNOWN) { + dev_info(&intf->dev, "Unknown control protocol\n"); + return; + } + + port = wwan_create_port(&intf->dev, desc->wwanp_type, &wdm_wwan_port_ops, desc); + if (IS_ERR(port)) { + dev_err(&intf->dev, "%s: Unable to create WWAN port\n", + dev_name(intf->usb_dev)); + return; + } + + desc->wwanp = port; +} + +static void wdm_wwan_deinit(struct wdm_device *desc) +{ + if (!desc->wwanp) + return; + + wwan_remove_port(desc->wwanp); + desc->wwanp = NULL; +} + +static void wdm_wwan_rx(struct wdm_device *desc, int length) +{ + struct wwan_port *port = desc->wwanp; + struct sk_buff *skb; + + /* Forward data to WWAN port */ + skb = alloc_skb(length, GFP_ATOMIC); + if (!skb) + return; + + memcpy(skb_put(skb, length), desc->inbuf, length); + wwan_port_rx(port, skb); + + /* inbuf has been copied, it is safe to check for outstanding data */ + schedule_work(&desc->service_outs_intr); +} +#else /* CONFIG_WWAN */ +static void wdm_wwan_init(struct wdm_device *desc) {} +static void wdm_wwan_deinit(struct wdm_device *desc) {} +static void wdm_wwan_rx(struct wdm_device *desc, int length) {} +#endif /* CONFIG_WWAN */ + /* --- error handling --- */ static void wdm_rxwork(struct work_struct *work) { @@ -836,7 +1000,8 @@ static void service_interrupt_work(struct work_struct *work) /* --- hotplug --- */ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - u16 bufsize, int (*manage_power)(struct usb_interface *, int)) + u16 bufsize, enum wwan_port_type type, + int (*manage_power)(struct usb_interface *, int)) { int rv = -ENOMEM; struct wdm_device *desc; @@ -853,6 +1018,7 @@ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor /* this will be expanded and needed in hardware endianness */ desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); desc->intf = intf; + desc->wwanp_type = type; INIT_WORK(&desc->rxwork, wdm_rxwork); INIT_WORK(&desc->service_outs_intr, service_interrupt_work); @@ -933,6 +1099,9 @@ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor goto err; else dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); + + wdm_wwan_init(desc); + out: return rv; err: @@ -977,7 +1146,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) goto err; ep = &iface->endpoint[0].desc; - rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); + rv = wdm_create(intf, ep, maxcom, WWAN_PORT_UNKNOWN, &wdm_manage_power); err: return rv; @@ -988,6 +1157,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) * @intf: usb interface the subdriver will associate with * @ep: interrupt endpoint to monitor for notifications * @bufsize: maximum message size to support for read/write + * @type: Type/protocol of the transported data (MBIM, QMI...) * @manage_power: call-back invoked during open and release to * manage the device's power * Create WDM usb class character device and associate it with intf @@ -1005,12 +1175,12 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) */ struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - int bufsize, + int bufsize, enum wwan_port_type type, int (*manage_power)(struct usb_interface *, int)) { int rv; - rv = wdm_create(intf, ep, bufsize, manage_power); + rv = wdm_create(intf, ep, bufsize, type, manage_power); if (rv < 0) goto err; @@ -1029,6 +1199,8 @@ static void wdm_disconnect(struct usb_interface *intf) desc = wdm_find_device(intf); mutex_lock(&wdm_mutex); + wdm_wwan_deinit(desc); + /* the spinlock makes sure no new urbs are generated in the callbacks */ spin_lock_irqsave(&desc->iuspin, flags); set_bit(WDM_DISCONNECTING, &desc->flags); diff --git a/include/linux/usb/cdc-wdm.h b/include/linux/usb/cdc-wdm.h index 9b895f9..9f5a51f 100644 --- a/include/linux/usb/cdc-wdm.h +++ b/include/linux/usb/cdc-wdm.h @@ -12,11 +12,12 @@ #ifndef __LINUX_USB_CDC_WDM_H #define __LINUX_USB_CDC_WDM_H +#include #include extern struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - int bufsize, + int bufsize, enum wwan_port_type type, int (*manage_power)(struct usb_interface *, int)); #endif /* __LINUX_USB_CDC_WDM_H */