// SPDX-License-Identifier: GPL-2.0-only /* * f_qc_rndis.c -- RNDIS link function driver * * Copyright (C) 2003-2005,2008 David Brownell * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger * Copyright (C) 2008 Nokia Corporation * Copyright (C) 2009 Samsung Electronics * Author: Michal Nazarewicz (mina86@mina86.com) * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ /* #define VERBOSE_DEBUG */ #include #include #include #include #include #include #include "u_ether.h" #include "rndis.h" #include "u_data_ipa.h" #include #include "configfs.h" static unsigned int rndis_dl_max_xfer_size = 9216; module_param(rndis_dl_max_xfer_size, uint, 0644); MODULE_PARM_DESC(rndis_dl_max_xfer_size, "Max size of bus transfer to host"); static struct class *rndis_class; static dev_t rndis_dev; static DEFINE_IDA(chardev_ida); /* * This function is an RNDIS Ethernet port -- a Microsoft protocol that's * been promoted instead of the standard CDC Ethernet. The published RNDIS * spec is ambiguous, incomplete, and needlessly complex. Variants such as * ActiveSync have even worse status in terms of specification. * * In short: it's a protocol controlled by (and for) Microsoft, not for an * Open ecosystem or markets. Linux supports it *only* because Microsoft * doesn't support the CDC Ethernet standard. * * The RNDIS data transfer model is complex, with multiple Ethernet packets * per USB message, and out of band data. The control model is built around * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM * (modem, not Ethernet) veneer, with those ACM descriptors being entirely * useless (they're ignored). RNDIS expects to be the only function in its * configuration, so it's no real help if you need composite devices; and * it expects to be the first configuration too. * * There is a single technical advantage of RNDIS over CDC Ethernet, if you * discount the fluff that its RPC can be made to deliver: it doesn't need * a NOP altsetting for the data interface. That lets it work on some of the * "so smart it's stupid" hardware which takes over configuration changes * from the software, and adds restrictions like "no altsettings". * * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and * have all sorts of contrary-to-specification oddities that can prevent * them from working sanely. Since bugfixes (or accurate specs, letting * Linux work around those bugs) are unlikely to ever come from MSFT, you * may want to avoid using RNDIS on purely operational grounds. * * Omissions from the RNDIS 1.0 specification include: * * - Power management ... references data that's scattered around lots * of other documentation, which is incorrect/incomplete there too. * * - There are various undocumented protocol requirements, like the need * to send garbage in some control-OUT messages. * * - MS-Windows drivers sometimes emit undocumented requests. * * This function is based on RNDIS link function driver and * contains MSM specific implementation. */ struct f_rndis_qc { struct usb_function func; u8 ctrl_id, data_id; u8 ethaddr[ETH_ALEN]; u32 vendorID; u8 ul_max_pkt_per_xfer; u8 pkt_alignment_factor; u32 max_pkt_size; const char *manufacturer; struct rndis_params *params; atomic_t ioctl_excl; atomic_t open_excl; struct usb_ep *notify; struct usb_request *notify_req; atomic_t notify_count; struct data_port bam_port; struct cdev cdev; struct device *dev; u8 port_num; u16 cdc_filter; bool net_ready_trigger; }; static struct ipa_usb_init_params rndis_ipa_params; static spinlock_t rndis_lock; static bool rndis_ipa_supported; static void rndis_qc_open(struct f_rndis_qc *rndis); static inline struct f_rndis_qc *func_to_rndis_qc(struct usb_function *f) { return container_of(f, struct f_rndis_qc, func); } /* peak (theoretical) bulk transfer rate in bits-per-second */ static unsigned int rndis_qc_bitrate(struct usb_gadget *g) { if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) return 13 * 1024 * 8 * 1000 * 8; else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) return 13 * 512 * 8 * 1000 * 8; else return 19 * 64 * 1 * 1000 * 8; } /*-------------------------------------------------------------------------*/ #define RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */ #define RNDIS_QC_STATUS_BYTECOUNT 8 /* 8 bytes data */ /* currently only one rndis instance is supported - port * index 0. */ #define RNDIS_QC_NO_PORTS 1 #define RNDIS_QC_ACTIVE_PORT 0 /* default max packets per tarnsfer value */ #define DEFAULT_MAX_PKT_PER_XFER 15 /* default pkt alignment factor */ #define DEFAULT_PKT_ALIGNMENT_FACTOR 4 #define RNDIS_QC_IOCTL_MAGIC 'i' #define RNDIS_QC_GET_MAX_PKT_PER_XFER _IOR(RNDIS_QC_IOCTL_MAGIC, 1, u8) #define RNDIS_QC_GET_MAX_PKT_SIZE _IOR(RNDIS_QC_IOCTL_MAGIC, 2, u32) /* interface descriptor: */ /* interface descriptor: Supports "Wireless" RNDIS; auto-detected by Windows*/ static struct usb_interface_descriptor rndis_qc_control_intf = { .bLength = sizeof(rndis_qc_control_intf), .bDescriptorType = USB_DT_INTERFACE, /* .bInterfaceNumber = DYNAMIC */ /* status endpoint is optional; this could be patched later */ .bNumEndpoints = 1, .bInterfaceClass = USB_CLASS_WIRELESS_CONTROLLER, .bInterfaceSubClass = 0x01, .bInterfaceProtocol = 0x03, /* .iInterface = DYNAMIC */ }; static struct usb_cdc_header_desc rndis_qc_header_desc = { .bLength = sizeof(rndis_qc_header_desc), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_HEADER_TYPE, .bcdCDC = cpu_to_le16(0x0110), }; static struct usb_cdc_call_mgmt_descriptor rndis_qc_call_mgmt_descriptor = { .bLength = sizeof(rndis_qc_call_mgmt_descriptor), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, .bmCapabilities = 0x00, .bDataInterface = 0x01, }; static struct usb_cdc_acm_descriptor rndis_qc_acm_descriptor = { .bLength = sizeof(rndis_qc_acm_descriptor), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_ACM_TYPE, .bmCapabilities = 0x00, }; static struct usb_cdc_union_desc rndis_qc_union_desc = { .bLength = sizeof(rndis_qc_union_desc), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_UNION_TYPE, /* .bMasterInterface0 = DYNAMIC */ /* .bSlaveInterface0 = DYNAMIC */ }; /* the data interface has two bulk endpoints */ static struct usb_interface_descriptor rndis_qc_data_intf = { .bLength = sizeof(rndis_qc_data_intf), .bDescriptorType = USB_DT_INTERFACE, /* .bInterfaceNumber = DYNAMIC */ .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_CDC_DATA, .bInterfaceSubClass = 0, .bInterfaceProtocol = 0, /* .iInterface = DYNAMIC */ }; /* Supports "Wireless" RNDIS; auto-detected by Windows */ static struct usb_interface_assoc_descriptor rndis_qc_iad_descriptor = { .bLength = sizeof(rndis_qc_iad_descriptor), .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, .bFirstInterface = 0, /* XXX, hardcoded */ .bInterfaceCount = 2, /* control + data */ .bFunctionClass = USB_CLASS_WIRELESS_CONTROLLER, .bFunctionSubClass = 0x01, .bFunctionProtocol = 0x03, /* .iFunction = DYNAMIC */ }; /* full speed support: */ static struct usb_endpoint_descriptor rndis_qc_fs_notify_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT), .bInterval = 1 << RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC, }; static struct usb_endpoint_descriptor rndis_qc_fs_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_endpoint_descriptor rndis_qc_fs_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_descriptor_header *eth_qc_fs_function[] = { (struct usb_descriptor_header *) &rndis_qc_iad_descriptor, /* control interface matches ACM, not Ethernet */ (struct usb_descriptor_header *) &rndis_qc_control_intf, (struct usb_descriptor_header *) &rndis_qc_header_desc, (struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor, (struct usb_descriptor_header *) &rndis_qc_acm_descriptor, (struct usb_descriptor_header *) &rndis_qc_union_desc, (struct usb_descriptor_header *) &rndis_qc_fs_notify_desc, /* data interface has no altsetting */ (struct usb_descriptor_header *) &rndis_qc_data_intf, (struct usb_descriptor_header *) &rndis_qc_fs_in_desc, (struct usb_descriptor_header *) &rndis_qc_fs_out_desc, NULL, }; /* high speed support: */ static struct usb_endpoint_descriptor rndis_qc_hs_notify_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT), .bInterval = RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC + 4, }; static struct usb_endpoint_descriptor rndis_qc_hs_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_endpoint_descriptor rndis_qc_hs_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_descriptor_header *eth_qc_hs_function[] = { (struct usb_descriptor_header *) &rndis_qc_iad_descriptor, /* control interface matches ACM, not Ethernet */ (struct usb_descriptor_header *) &rndis_qc_control_intf, (struct usb_descriptor_header *) &rndis_qc_header_desc, (struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor, (struct usb_descriptor_header *) &rndis_qc_acm_descriptor, (struct usb_descriptor_header *) &rndis_qc_union_desc, (struct usb_descriptor_header *) &rndis_qc_hs_notify_desc, /* data interface has no altsetting */ (struct usb_descriptor_header *) &rndis_qc_data_intf, (struct usb_descriptor_header *) &rndis_qc_hs_in_desc, (struct usb_descriptor_header *) &rndis_qc_hs_out_desc, NULL, }; /* super speed support: */ static struct usb_endpoint_descriptor rndis_qc_ss_notify_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT), .bInterval = RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC + 4, }; static struct usb_ss_ep_comp_descriptor rndis_qc_ss_intr_comp_desc = { .bLength = sizeof(rndis_qc_ss_intr_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, /* the following 3 values can be tweaked if necessary */ /* .bMaxBurst = 0, */ /* .bmAttributes = 0, */ .wBytesPerInterval = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT), }; static struct usb_endpoint_descriptor rndis_qc_ss_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(1024), }; static struct usb_endpoint_descriptor rndis_qc_ss_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(1024), }; static struct usb_ss_ep_comp_descriptor rndis_qc_ss_bulk_comp_desc = { .bLength = sizeof(rndis_qc_ss_bulk_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, /* the following 2 values can be tweaked if necessary */ /* .bMaxBurst = 0, */ /* .bmAttributes = 0, */ }; static struct usb_descriptor_header *eth_qc_ss_function[] = { (struct usb_descriptor_header *) &rndis_qc_iad_descriptor, /* control interface matches ACM, not Ethernet */ (struct usb_descriptor_header *) &rndis_qc_control_intf, (struct usb_descriptor_header *) &rndis_qc_header_desc, (struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor, (struct usb_descriptor_header *) &rndis_qc_acm_descriptor, (struct usb_descriptor_header *) &rndis_qc_union_desc, (struct usb_descriptor_header *) &rndis_qc_ss_notify_desc, (struct usb_descriptor_header *) &rndis_qc_ss_intr_comp_desc, /* data interface has no altsetting */ (struct usb_descriptor_header *) &rndis_qc_data_intf, (struct usb_descriptor_header *) &rndis_qc_ss_in_desc, (struct usb_descriptor_header *) &rndis_qc_ss_bulk_comp_desc, (struct usb_descriptor_header *) &rndis_qc_ss_out_desc, (struct usb_descriptor_header *) &rndis_qc_ss_bulk_comp_desc, NULL, }; /* string descriptors: */ static struct usb_string rndis_qc_string_defs[] = { [0].s = "RNDIS Communications Control", [1].s = "RNDIS Ethernet Data", [2].s = "RNDIS", { } /* end of list */ }; static struct usb_gadget_strings rndis_qc_string_table = { .language = 0x0409, /* en-us */ .strings = rndis_qc_string_defs, }; static struct usb_gadget_strings *rndis_qc_strings[] = { &rndis_qc_string_table, NULL, }; static struct f_rndis_qc *_rndis_qc; static inline int rndis_qc_lock(atomic_t *excl) { if (atomic_inc_return(excl) == 1) return 0; atomic_dec(excl); return -EBUSY; } static inline void rndis_qc_unlock(atomic_t *excl) { atomic_dec(excl); } /*-------------------------------------------------------------------------*/ static void rndis_qc_response_available(void *_rndis) { struct f_rndis_qc *rndis = _rndis; struct usb_request *req = rndis->notify_req; __le32 *data = req->buf; int status; if (atomic_inc_return(&rndis->notify_count) != 1) return; if (!rndis->notify->driver_data) return; /* Send RNDIS RESPONSE_AVAILABLE notification; a * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too * * This is the only notification defined by RNDIS. */ data[0] = cpu_to_le32(1); data[1] = cpu_to_le32(0); status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); if (status) { atomic_dec(&rndis->notify_count); pr_info("notify/0 --> %d\n", status); } } static void rndis_qc_response_complete(struct usb_ep *ep, struct usb_request *req) { struct f_rndis_qc *rndis; int status = req->status; struct usb_composite_dev *cdev; struct usb_ep *notify_ep; spin_lock(&rndis_lock); rndis = _rndis_qc; if (!rndis || !rndis->notify || !rndis->notify->driver_data) { spin_unlock(&rndis_lock); return; } if (!rndis->func.config || !rndis->func.config->cdev) { pr_err("%s(): cdev or config is NULL.\n", __func__); spin_unlock(&rndis_lock); return; } cdev = rndis->func.config->cdev; /* after TX: * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control) * - RNDIS_RESPONSE_AVAILABLE (status/irq) */ switch (status) { case -ECONNRESET: case -ESHUTDOWN: /* connection gone */ atomic_set(&rndis->notify_count, 0); goto out; default: pr_info("RNDIS %s response error %d, %d/%d\n", ep->name, status, req->actual, req->length); /* FALLTHROUGH */ case 0: if (ep != rndis->notify) goto out; /* handle multiple pending RNDIS_RESPONSE_AVAILABLE * notifications by resending until we're done */ if (atomic_dec_and_test(&rndis->notify_count)) goto out; notify_ep = rndis->notify; spin_unlock(&rndis_lock); status = usb_ep_queue(notify_ep, req, GFP_ATOMIC); if (status) { spin_lock(&rndis_lock); if (!_rndis_qc) goto out; atomic_dec(&_rndis_qc->notify_count); DBG(cdev, "notify/1 --> %d\n", status); spin_unlock(&rndis_lock); } } return; out: spin_unlock(&rndis_lock); } static void rndis_qc_command_complete(struct usb_ep *ep, struct usb_request *req) { struct f_rndis_qc *rndis; int status; rndis_init_msg_type *buf; u32 ul_max_xfer_size, dl_max_xfer_size; if (req->status != 0) { pr_err("%s: RNDIS command completion error %d\n", __func__, req->status); return; } spin_lock(&rndis_lock); rndis = _rndis_qc; if (!rndis || !rndis->notify || !rndis->notify->driver_data) { spin_unlock(&rndis_lock); return; } /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */ status = rndis_msg_parser(rndis->params, (u8 *) req->buf); if (status < 0) pr_err("RNDIS command error %d, %d/%d\n", status, req->actual, req->length); buf = (rndis_init_msg_type *)req->buf; if (le32_to_cpu(buf->MessageType) == RNDIS_MSG_INIT) { ul_max_xfer_size = rndis_get_ul_max_xfer_size(rndis->params); ipa_data_set_ul_max_xfer_size(ul_max_xfer_size); /* * For consistent data throughput from IPA, it is required to * fine tune aggregation byte limit as 7KB. RNDIS IPA driver * use provided this value to calculate aggregation byte limit * and program IPA hardware for aggregation. * Host provides 8KB or 16KB as Max Transfer size, hence select * minimum out of host provided value and optimum transfer size * to get 7KB as aggregation byte limit. */ if (rndis_dl_max_xfer_size) dl_max_xfer_size = min_t(u32, rndis_dl_max_xfer_size, rndis_get_dl_max_xfer_size(rndis->params)); else dl_max_xfer_size = rndis_get_dl_max_xfer_size(rndis->params); ipa_data_set_dl_max_xfer_size(dl_max_xfer_size); } spin_unlock(&rndis_lock); } static int rndis_qc_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); struct usb_composite_dev *cdev = f->config->cdev; struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; u16 w_index = le16_to_cpu(ctrl->wIndex); u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); /* composite driver infrastructure handles everything except * CDC class messages; interface activation uses set_alt(). */ pr_debug("%s: Enter\n", __func__); switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { /* RNDIS uses the CDC command encapsulation mechanism to implement * an RPC scheme, with much getting/setting of attributes by OID. */ case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_SEND_ENCAPSULATED_COMMAND: if (w_value || w_index != rndis->ctrl_id) goto invalid; /* read the request; process it later */ value = w_length; req->complete = rndis_qc_command_complete; /* later, rndis_response_available() sends a notification */ break; case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_GET_ENCAPSULATED_RESPONSE: if (w_value || w_index != rndis->ctrl_id) goto invalid; else { u8 *buf; u32 n; /* return the result */ buf = rndis_get_next_response(rndis->params, &n); if (buf) { memcpy(req->buf, buf, n); req->complete = rndis_qc_response_complete; rndis_free_response(rndis->params, buf); value = n; } /* else stalls ... spec says to avoid that */ } break; default: invalid: VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); } /* respond with data transfer or status phase? */ if (value >= 0) { DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); req->context = rndis; req->zero = (value < w_length); req->length = value; value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); if (value < 0) pr_err("rndis response on err %d\n", value); } /* device either stalls (value < 0) or reports success */ return value; } static struct net_device *rndis_qc_get_net(const char *netname) { struct net_device *net_dev; net_dev = dev_get_by_name(&init_net, netname); if (!net_dev) return ERR_PTR(-EINVAL); /* * Decrement net_dev refcount as it was incremented in * dev_get_by_name(). */ dev_put(net_dev); return net_dev; } static int rndis_qc_set_alt(struct usb_function *f, unsigned int intf, unsigned int alt) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); struct f_rndis_qc_opts *opts; struct usb_composite_dev *cdev = f->config->cdev; int src_connection_idx; int dst_connection_idx; enum usb_ctrl usb_bam_type; int ret; /* we know alt == 0 */ opts = container_of(f->fi, struct f_rndis_qc_opts, func_inst); if (intf == rndis->ctrl_id) { if (rndis->notify->driver_data) { VDBG(cdev, "reset rndis control %d\n", intf); usb_ep_disable(rndis->notify); } if (!rndis->notify->desc) { VDBG(cdev, "init rndis ctrl %d\n", intf); if (config_ep_by_speed(cdev->gadget, f, rndis->notify)) goto fail; } usb_ep_enable(rndis->notify); rndis->notify->driver_data = rndis; } else if (intf == rndis->data_id) { struct net_device *net; rndis->net_ready_trigger = false; if (rndis->bam_port.in->driver_data) { DBG(cdev, "reset rndis\n"); /* bam_port is needed for disconnecting the BAM data * path. Only after the BAM data path is disconnected, * we can disconnect the port from the network layer. */ ipa_data_disconnect(&rndis->bam_port, USB_IPA_FUNC_RNDIS); } if (!rndis->bam_port.in->desc || !rndis->bam_port.out->desc) { DBG(cdev, "init rndis\n"); if (config_ep_by_speed(cdev->gadget, f, rndis->bam_port.in) || config_ep_by_speed(cdev->gadget, f, rndis->bam_port.out)) { rndis->bam_port.in->desc = NULL; rndis->bam_port.out->desc = NULL; goto fail; } } /* RNDIS should be in the "RNDIS uninitialized" state, * either never activated or after rndis_uninit(). * * We don't want data to flow here until a nonzero packet * filter is set, at which point it enters "RNDIS data * initialized" state ... but we do want the endpoints * to be activated. It's a strange little state. * * REVISIT the RNDIS gadget code has done this wrong for a * very long time. We need another call to the link layer * code -- gether_updown(...bool) maybe -- to do it right. */ rndis->cdc_filter = 0; rndis->bam_port.cdev = cdev; rndis->bam_port.func = &rndis->func; ipa_data_port_select(USB_IPA_FUNC_RNDIS); usb_bam_type = usb_bam_get_bam_type(cdev->gadget->name); src_connection_idx = usb_bam_get_connection_idx(usb_bam_type, IPA_P_BAM, USB_TO_PEER_PERIPHERAL, rndis->port_num); dst_connection_idx = usb_bam_get_connection_idx(usb_bam_type, IPA_P_BAM, PEER_PERIPHERAL_TO_USB, rndis->port_num); if (src_connection_idx < 0 || dst_connection_idx < 0) { pr_err("%s: usb_bam_get_connection_idx failed\n", __func__); return ret; } if (ipa_data_connect(&rndis->bam_port, USB_IPA_FUNC_RNDIS, src_connection_idx, dst_connection_idx)) goto fail; DBG(cdev, "RNDIS RX/TX early activation ...\n"); rndis_qc_open(rndis); net = rndis_qc_get_net("rndis0"); if (IS_ERR(net)) return PTR_ERR(net); opts->net = net; rndis_set_param_dev(rndis->params, net, &rndis->cdc_filter); } else goto fail; return 0; fail: return -EINVAL; } static void rndis_qc_disable(struct usb_function *f) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); struct usb_composite_dev *cdev = f->config->cdev; unsigned long flags; if (!rndis->notify->driver_data) return; DBG(cdev, "rndis deactivated\n"); spin_lock_irqsave(&rndis_lock, flags); rndis_uninit(rndis->params); spin_unlock_irqrestore(&rndis_lock, flags); ipa_data_disconnect(&rndis->bam_port, USB_IPA_FUNC_RNDIS); msm_ep_unconfig(rndis->bam_port.out); msm_ep_unconfig(rndis->bam_port.in); usb_ep_disable(rndis->notify); rndis->notify->driver_data = NULL; } static void rndis_qc_suspend(struct usb_function *f) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); bool remote_wakeup_allowed; if (f->config->cdev->gadget->speed == USB_SPEED_SUPER) remote_wakeup_allowed = f->func_wakeup_allowed; else remote_wakeup_allowed = f->config->cdev->gadget->remote_wakeup; pr_info("%s(): start rndis suspend: remote_wakeup_allowed:%d\n", __func__, remote_wakeup_allowed); if (!remote_wakeup_allowed) { /* This is required as Linux host side RNDIS driver doesn't * send RNDIS_MESSAGE_PACKET_FILTER before suspending USB bus. * Hence we perform same operations explicitly here for Linux * host case. In case of windows, this RNDIS state machine is * already updated due to receiving of PACKET_FILTER. */ rndis_flow_control(rndis->params, true); pr_debug("%s(): Disconnecting\n", __func__); } ipa_data_suspend(&rndis->bam_port, USB_IPA_FUNC_RNDIS, remote_wakeup_allowed); pr_debug("rndis suspended\n"); } static void rndis_qc_resume(struct usb_function *f) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); bool remote_wakeup_allowed; pr_debug("%s: rndis resumed\n", __func__); /* Nothing to do if DATA interface wasn't initialized */ if (!rndis->bam_port.cdev) { pr_debug("data interface was not up\n"); return; } if (f->config->cdev->gadget->speed == USB_SPEED_SUPER) remote_wakeup_allowed = f->func_wakeup_allowed; else remote_wakeup_allowed = f->config->cdev->gadget->remote_wakeup; ipa_data_resume(&rndis->bam_port, USB_IPA_FUNC_RNDIS, remote_wakeup_allowed); if (!remote_wakeup_allowed) { rndis_qc_open(rndis); /* * Linux Host doesn't sends RNDIS_MSG_INIT or non-zero value * set with RNDIS_MESSAGE_PACKET_FILTER after performing bus * resume. Hence trigger USB IPA transfer functionality * explicitly here. For Windows host case is also being * handle with RNDIS state machine. */ rndis_flow_control(rndis->params, false); } pr_debug("%s: RNDIS resume completed\n", __func__); } /*-------------------------------------------------------------------------*/ /* * This isn't quite the same mechanism as CDC Ethernet, since the * notification scheme passes less data, but the same set of link * states must be tested. A key difference is that altsettings are * not used to tell whether the link should send packets or not. */ static void rndis_qc_open(struct f_rndis_qc *rndis) { struct usb_composite_dev *cdev = rndis->func.config->cdev; DBG(cdev, "%s\n", __func__); rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, rndis_qc_bitrate(cdev->gadget) / 100); rndis_signal_connect(rndis->params); } static void ipa_data_flow_control_enable(bool enable, struct rndis_params *param) { if (enable) ipa_data_stop_rndis_ipa(USB_IPA_FUNC_RNDIS); else ipa_data_start_rndis_ipa(USB_IPA_FUNC_RNDIS); } /*-------------------------------------------------------------------------*/ /* ethernet function driver setup/binding */ static int rndis_qc_bind(struct usb_configuration *c, struct usb_function *f) { struct usb_composite_dev *cdev = c->cdev; struct f_rndis_qc *rndis = func_to_rndis_qc(f); struct rndis_params *params; int status; struct usb_ep *ep; status = rndis_ipa_init(&rndis_ipa_params); if (status) { pr_err("%s: failed to init rndis_ipa\n", __func__); return status; } rndis_ipa_supported = true; /* maybe allocate device-global string IDs */ if (rndis_qc_string_defs[0].id == 0) { /* control interface label */ status = usb_string_id(c->cdev); if (status < 0) return status; rndis_qc_string_defs[0].id = status; rndis_qc_control_intf.iInterface = status; /* data interface label */ status = usb_string_id(c->cdev); if (status < 0) return status; rndis_qc_string_defs[1].id = status; rndis_qc_data_intf.iInterface = status; /* IAD iFunction label */ status = usb_string_id(c->cdev); if (status < 0) return status; rndis_qc_string_defs[2].id = status; rndis_qc_iad_descriptor.iFunction = status; } /* allocate instance-specific interface IDs */ status = usb_interface_id(c, f); if (status < 0) goto fail; rndis->ctrl_id = status; rndis_qc_iad_descriptor.bFirstInterface = status; rndis_qc_control_intf.bInterfaceNumber = status; rndis_qc_union_desc.bMasterInterface0 = status; status = usb_interface_id(c, f); if (status < 0) goto fail; rndis->data_id = status; rndis_qc_data_intf.bInterfaceNumber = status; rndis_qc_union_desc.bSlaveInterface0 = status; status = -ENODEV; /* allocate instance-specific endpoints */ ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_in_desc); if (!ep) goto fail; rndis->bam_port.in = ep; ep->driver_data = cdev; /* claim */ ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_out_desc); if (!ep) goto fail; rndis->bam_port.out = ep; ep->driver_data = cdev; /* claim */ /* NOTE: a status/notification endpoint is, strictly speaking, * optional. We don't treat it that way though! It's simpler, * and some newer profiles don't treat it as optional. */ ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_notify_desc); if (!ep) goto fail; rndis->notify = ep; ep->driver_data = cdev; /* claim */ status = -ENOMEM; /* allocate notification request and buffer */ rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); if (!rndis->notify_req) goto fail; rndis->notify_req->buf = kmalloc(RNDIS_QC_STATUS_BYTECOUNT, GFP_KERNEL); if (!rndis->notify_req->buf) goto fail; rndis->notify_req->length = RNDIS_QC_STATUS_BYTECOUNT; rndis->notify_req->context = rndis; rndis->notify_req->complete = rndis_qc_response_complete; /* copy descriptors, and track endpoint copies */ f->fs_descriptors = usb_copy_descriptors(eth_qc_fs_function); if (!f->fs_descriptors) goto fail; /* support all relevant hardware speeds... we expect that when * hardware is dual speed, all bulk-capable endpoints work at * both speeds */ if (gadget_is_dualspeed(c->cdev->gadget)) { rndis_qc_hs_in_desc.bEndpointAddress = rndis_qc_fs_in_desc.bEndpointAddress; rndis_qc_hs_out_desc.bEndpointAddress = rndis_qc_fs_out_desc.bEndpointAddress; rndis_qc_hs_notify_desc.bEndpointAddress = rndis_qc_fs_notify_desc.bEndpointAddress; /* copy descriptors, and track endpoint copies */ f->hs_descriptors = usb_copy_descriptors(eth_qc_hs_function); if (!f->hs_descriptors) goto fail; } if (gadget_is_superspeed(c->cdev->gadget)) { rndis_qc_ss_in_desc.bEndpointAddress = rndis_qc_fs_in_desc.bEndpointAddress; rndis_qc_ss_out_desc.bEndpointAddress = rndis_qc_fs_out_desc.bEndpointAddress; rndis_qc_ss_notify_desc.bEndpointAddress = rndis_qc_fs_notify_desc.bEndpointAddress; /* copy descriptors, and track endpoint copies */ f->ss_descriptors = usb_copy_descriptors(eth_qc_ss_function); if (!f->ss_descriptors) goto fail; } params = rndis_register(rndis_qc_response_available, rndis, ipa_data_flow_control_enable); if (IS_ERR(params)) goto fail; rndis->params = params; rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0); rndis_set_host_mac(rndis->params, rndis->ethaddr); if (rndis->manufacturer && rndis->vendorID && rndis_set_param_vendor(rndis->params, rndis->vendorID, rndis->manufacturer)) goto fail; pr_debug("%s(): max_pkt_per_xfer:%d\n", __func__, rndis->ul_max_pkt_per_xfer); rndis_set_max_pkt_xfer(rndis->params, rndis->ul_max_pkt_per_xfer); /* In case of aggregated packets QC device will request * aliment to 4 (2^2). */ pr_debug("%s(): pkt_alignment_factor:%d\n", __func__, rndis->pkt_alignment_factor); rndis_set_pkt_alignment_factor(rndis->params, rndis->pkt_alignment_factor); /* NOTE: all that is done without knowing or caring about * the network link ... which is unavailable to this code * until we're activated via set_alt(). */ c->cdev->gadget->bam2bam_func_enabled = true; DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n", gadget_is_superspeed(c->cdev->gadget) ? "super" : gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", rndis->bam_port.in->name, rndis->bam_port.out->name, rndis->notify->name); return 0; fail: if (gadget_is_superspeed(c->cdev->gadget) && f->ss_descriptors) usb_free_descriptors(f->ss_descriptors); if (gadget_is_dualspeed(c->cdev->gadget) && f->hs_descriptors) usb_free_descriptors(f->hs_descriptors); if (f->fs_descriptors) usb_free_descriptors(f->fs_descriptors); if (rndis->notify_req) { kfree(rndis->notify_req->buf); usb_ep_free_request(rndis->notify, rndis->notify_req); } /* we might as well release our claims on endpoints */ if (rndis->notify) rndis->notify->driver_data = NULL; if (rndis->bam_port.out->desc) rndis->bam_port.out->driver_data = NULL; if (rndis->bam_port.in->desc) rndis->bam_port.in->driver_data = NULL; pr_err("%s: can't bind, err %d\n", f->name, status); return status; } static void rndis_qc_free(struct usb_function *f) { struct f_rndis_qc_opts *opts; opts = container_of(f->fi, struct f_rndis_qc_opts, func_inst); opts->refcnt--; } static void rndis_qc_unbind(struct usb_configuration *c, struct usb_function *f) { struct f_rndis_qc *rndis = func_to_rndis_qc(f); pr_debug("func %s: free\n", __func__); rndis_deregister(rndis->params); if (gadget_is_dualspeed(c->cdev->gadget)) usb_free_descriptors(f->hs_descriptors); usb_free_descriptors(f->fs_descriptors); c->cdev->gadget->bam2bam_func_enabled = false; kfree(rndis->notify_req->buf); usb_ep_free_request(rndis->notify, rndis->notify_req); /* * call flush_workqueue to make sure that any pending * disconnect_work() from u_bam_data.c file is being * flushed before calling this rndis_ipa_cleanup API * as rndis ipa disconnect API is required to be * called before this. */ ipa_data_flush_workqueue(); rndis_ipa_cleanup(rndis_ipa_params.private); rndis_ipa_supported = false; } void rndis_ipa_reset_trigger(void) { struct f_rndis_qc *rndis; rndis = _rndis_qc; if (!rndis) { pr_err("%s: No RNDIS instance\n", __func__); return; } rndis->net_ready_trigger = false; } /* * Callback let RNDIS_IPA trigger us when network interface is up * and userspace is ready to answer DHCP requests */ static void rndis_net_ready_notify(void) { struct f_rndis_qc *rndis; unsigned long flags; spin_lock_irqsave(&rndis_lock, flags); rndis = _rndis_qc; if (!rndis) { pr_err("%s: No RNDIS instance\n", __func__); spin_unlock_irqrestore(&rndis_lock, flags); return; } if (rndis->net_ready_trigger) { pr_err("%s: Already triggered\n", __func__); spin_unlock_irqrestore(&rndis_lock, flags); return; } pr_debug("%s: Set net_ready_trigger\n", __func__); rndis->net_ready_trigger = true; spin_unlock_irqrestore(&rndis_lock, flags); ipa_data_start_rx_tx(USB_IPA_FUNC_RNDIS); } /** * rndis_qc_bind_config - add RNDIS network link to a configuration * @c: the configuration to support the network link * @ethaddr: a buffer in which the ethernet address of the host side * side of the link was recorded * Context: single threaded during gadget setup * * Returns zero on success, else negative errno. * * Caller must have called @gether_setup(). Caller is also responsible * for calling @gether_cleanup() before module unload. */ static struct usb_function *rndis_qc_bind_config_vendor(struct usb_function_instance *fi, u32 vendorID, const char *manufacturer, u8 max_pkt_per_xfer, u8 pkt_alignment_factor) { struct f_rndis_qc_opts *opts = container_of(fi, struct f_rndis_qc_opts, func_inst); struct f_rndis_qc *rndis; /* allocate and initialize one new instance */ opts = container_of(fi, struct f_rndis_qc_opts, func_inst); opts->refcnt++; rndis = opts->rndis; rndis->vendorID = opts->vendor_id; rndis->manufacturer = opts->manufacturer; /* export host's Ethernet address in CDC format */ random_ether_addr(rndis_ipa_params.host_ethaddr); random_ether_addr(rndis_ipa_params.device_ethaddr); pr_debug("setting host_ethaddr=%pM, device_ethaddr=%pM\n", rndis_ipa_params.host_ethaddr, rndis_ipa_params.device_ethaddr); ether_addr_copy(rndis->ethaddr, rndis_ipa_params.host_ethaddr); rndis_ipa_params.device_ready_notify = rndis_net_ready_notify; /* if max_pkt_per_xfer was not configured set to default value */ rndis->ul_max_pkt_per_xfer = max_pkt_per_xfer ? max_pkt_per_xfer : DEFAULT_MAX_PKT_PER_XFER; ipa_data_set_ul_max_pkt_num(rndis->ul_max_pkt_per_xfer); /* * Check no RNDIS aggregation, and alignment if not mentioned, * use alignment factor as zero. If aggregated RNDIS data transfer, * max packet per transfer would be default if it is not set * explicitly, and same way use alignment factor as 2 by default. * This would eliminate need of writing to sysfs if default RNDIS * aggregation setting required. Writing to both sysfs entries, * those values will always override default values. */ if ((rndis->pkt_alignment_factor == 0) && (rndis->ul_max_pkt_per_xfer == 1)) rndis->pkt_alignment_factor = 0; else rndis->pkt_alignment_factor = pkt_alignment_factor ? pkt_alignment_factor : DEFAULT_PKT_ALIGNMENT_FACTOR; /* RNDIS activates when the host changes this filter */ rndis->cdc_filter = 0; rndis->func.name = "rndis"; rndis->func.strings = rndis_qc_strings; /* descriptors are per-instance copies */ rndis->func.bind = rndis_qc_bind; rndis->func.unbind = rndis_qc_unbind; rndis->func.set_alt = rndis_qc_set_alt; rndis->func.setup = rndis_qc_setup; rndis->func.disable = rndis_qc_disable; rndis->func.suspend = rndis_qc_suspend; rndis->func.resume = rndis_qc_resume; rndis->func.free_func = rndis_qc_free; _rndis_qc = rndis; return &rndis->func; } static struct usb_function *qcrndis_alloc(struct usb_function_instance *fi) { return rndis_qc_bind_config_vendor(fi, 0, NULL, 0, 0); } static int rndis_qc_open_dev(struct inode *ip, struct file *fp) { int ret = 0; unsigned long flags; pr_info("Open rndis QC driver\n"); spin_lock_irqsave(&rndis_lock, flags); if (!_rndis_qc) { pr_err("rndis_qc_dev not created yet\n"); ret = -ENODEV; goto fail; } if (rndis_qc_lock(&_rndis_qc->open_excl)) { pr_err("Already opened\n"); ret = -EBUSY; goto fail; } fp->private_data = _rndis_qc; fail: spin_unlock_irqrestore(&rndis_lock, flags); if (!ret) pr_info("rndis QC file opened\n"); return ret; } static int rndis_qc_release_dev(struct inode *ip, struct file *fp) { unsigned long flags; pr_info("Close rndis QC file\n"); spin_lock_irqsave(&rndis_lock, flags); if (!_rndis_qc) { pr_err("rndis_qc_dev not present\n"); spin_unlock_irqrestore(&rndis_lock, flags); return -ENODEV; } rndis_qc_unlock(&_rndis_qc->open_excl); spin_unlock_irqrestore(&rndis_lock, flags); return 0; } static long rndis_qc_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { u8 qc_max_pkt_per_xfer = 0; u32 qc_max_pkt_size = 0; int ret = 0; unsigned long flags; spin_lock_irqsave(&rndis_lock, flags); if (!_rndis_qc) { pr_err("rndis_qc_dev not present\n"); ret = -ENODEV; goto fail; } qc_max_pkt_per_xfer = _rndis_qc->ul_max_pkt_per_xfer; qc_max_pkt_size = _rndis_qc->max_pkt_size; if (rndis_qc_lock(&_rndis_qc->ioctl_excl)) { ret = -EBUSY; goto fail; } spin_unlock_irqrestore(&rndis_lock, flags); pr_info("Received command %d\n", cmd); switch (cmd) { case RNDIS_QC_GET_MAX_PKT_PER_XFER: ret = copy_to_user((void __user *)arg, &qc_max_pkt_per_xfer, sizeof(qc_max_pkt_per_xfer)); if (ret) { pr_err("copying to user space failed\n"); ret = -EFAULT; } pr_info("Sent UL max packets per xfer %d\n", qc_max_pkt_per_xfer); break; case RNDIS_QC_GET_MAX_PKT_SIZE: ret = copy_to_user((void __user *)arg, &qc_max_pkt_size, sizeof(qc_max_pkt_size)); if (ret) { pr_err("copying to user space failed\n"); ret = -EFAULT; } pr_debug("Sent max packet size %d\n", qc_max_pkt_size); break; default: pr_err("Unsupported IOCTL\n"); ret = -EINVAL; } spin_lock_irqsave(&rndis_lock, flags); if (!_rndis_qc) { pr_err("rndis_qc_dev not present\n"); ret = -ENODEV; goto fail; } rndis_qc_unlock(&_rndis_qc->ioctl_excl); fail: spin_unlock_irqrestore(&rndis_lock, flags); return ret; } static const struct file_operations rndis_qc_fops = { .owner = THIS_MODULE, .open = rndis_qc_open_dev, .release = rndis_qc_release_dev, .unlocked_ioctl = rndis_qc_ioctl, }; static void qcrndis_free_inst(struct usb_function_instance *f) { struct f_rndis_qc_opts *opts = container_of(f, struct f_rndis_qc_opts, func_inst); int minor = MINOR(opts->rndis->cdev.dev); unsigned long flags; device_destroy(rndis_class, MKDEV(MAJOR(rndis_dev), minor)); class_destroy(rndis_class); cdev_del(&opts->rndis->cdev); ida_simple_remove(&chardev_ida, minor); unregister_chrdev_region(rndis_dev, 1); ipa_data_free(USB_IPA_FUNC_RNDIS); spin_lock_irqsave(&rndis_lock, flags); kfree(opts->rndis); _rndis_qc = NULL; kfree(opts); spin_unlock_irqrestore(&rndis_lock, flags); } static int qcrndis_set_inst_name(struct usb_function_instance *fi, const char *name) { struct f_rndis_qc_opts *opts = container_of(fi, struct f_rndis_qc_opts, func_inst); struct f_rndis_qc *rndis; int name_len; int ret, minor; name_len = strlen(name) + 1; if (name_len > MAX_INST_NAME_LEN) return -ENAMETOOLONG; pr_debug("initialize rndis QC instance\n"); rndis = kzalloc(sizeof(*rndis), GFP_KERNEL); if (!rndis) { pr_err("%s: fail allocate and initialize new instance\n", __func__); return -ENOMEM; } spin_lock_init(&rndis_lock); opts->rndis = rndis; rndis_class = class_create(THIS_MODULE, "usbrndis"); ret = alloc_chrdev_region(&rndis_dev, 0, 1, "usb_rndis"); if (ret < 0) { pr_err("Fail to allocate usb rndis char dev region\n"); return ret; } /* get a minor number */ minor = ida_simple_get(&chardev_ida, 0, 0, GFP_KERNEL); if (minor < 0) { pr_err("%s: No more minor numbers left! rc:%d\n", __func__, minor); ret = -ENODEV; goto fail_out_of_minors; } rndis->dev = device_create(rndis_class, NULL, MKDEV(MAJOR(rndis_dev), minor), rndis, "android_rndis_qc"); if (IS_ERR(rndis->dev)) { ret = PTR_ERR(rndis->dev); pr_err("%s: device_create failed for (%d)\n", __func__, ret); goto fail_return_minor; } cdev_init(&rndis->cdev, &rndis_qc_fops); ret = cdev_add(&rndis->cdev, MKDEV(MAJOR(rndis_dev), minor), 1); if (ret < 0) { pr_err("%s: cdev_add failed for %s (%d)\n", __func__, name, ret); goto fail_cdev_add; } if (ret) pr_err("rndis QC driver failed to register\n"); ret = ipa_data_setup(USB_IPA_FUNC_RNDIS); if (ret) { pr_err("bam_data_setup failed err: %d\n", ret); goto fail_data_setup; } return 0; fail_data_setup: cdev_del(&rndis->cdev); fail_cdev_add: device_destroy(rndis_class, MKDEV(MAJOR(rndis_dev), minor)); fail_return_minor: ida_simple_remove(&chardev_ida, minor); fail_out_of_minors: unregister_chrdev_region(rndis_dev, 1); class_destroy(rndis_class); kfree(rndis); return ret; } static inline struct f_rndis_qc_opts *to_f_qc_rndis_opts(struct config_item *item) { return container_of(to_config_group(item), struct f_rndis_qc_opts, func_inst.group); } static void qcrndis_attr_release(struct config_item *item) { struct f_rndis_qc_opts *opts = to_f_qc_rndis_opts(item); usb_put_function_instance(&opts->func_inst); } static struct configfs_item_operations qcrndis_item_ops = { .release = qcrndis_attr_release, }; static struct config_item_type qcrndis_func_type = { .ct_item_ops = &qcrndis_item_ops, .ct_owner = THIS_MODULE, }; static struct usb_function_instance *qcrndis_alloc_inst(void) { struct f_rndis_qc_opts *opts; opts = kzalloc(sizeof(*opts), GFP_KERNEL); if (!opts) return ERR_PTR(-ENOMEM); opts->func_inst.set_inst_name = qcrndis_set_inst_name; opts->func_inst.free_func_inst = qcrndis_free_inst; config_group_init_type_name(&opts->func_inst.group, "", &qcrndis_func_type); return &opts->func_inst; } void *rndis_qc_get_ipa_rx_cb(void) { return rndis_ipa_params.ipa_rx_notify; } void *rndis_qc_get_ipa_tx_cb(void) { return rndis_ipa_params.ipa_tx_notify; } void *rndis_qc_get_ipa_priv(void) { return rndis_ipa_params.private; } bool rndis_qc_get_skip_ep_config(void) { return rndis_ipa_params.skip_ep_cfg; } DECLARE_USB_FUNCTION_INIT(rndis_bam, qcrndis_alloc_inst, qcrndis_alloc); static int __init usb_qcrndis_init(void) { int ret; ret = usb_function_register(&rndis_bamusb_func); if (ret) { pr_err("%s: failed to register diag %d\n", __func__, ret); return ret; } return ret; } static void __exit usb_qcrndis_exit(void) { usb_function_unregister(&rndis_bamusb_func); } module_init(usb_qcrndis_init); module_exit(usb_qcrndis_exit); MODULE_DESCRIPTION("USB RMNET Function Driver");