1900d495aSAlexey Orishko /* 2900d495aSAlexey Orishko * cdc_ncm.c 3900d495aSAlexey Orishko * 4c84ff1d6SAlexey Orishko * Copyright (C) ST-Ericsson 2010-2012 5900d495aSAlexey Orishko * Contact: Alexey Orishko <alexey.orishko@stericsson.com> 6900d495aSAlexey Orishko * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com> 7900d495aSAlexey Orishko * 8900d495aSAlexey Orishko * USB Host Driver for Network Control Model (NCM) 9900d495aSAlexey Orishko * http://www.usb.org/developers/devclass_docs/NCM10.zip 10900d495aSAlexey Orishko * 11900d495aSAlexey Orishko * The NCM encoding, decoding and initialization logic 12900d495aSAlexey Orishko * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h 13900d495aSAlexey Orishko * 14900d495aSAlexey Orishko * This software is available to you under a choice of one of two 15900d495aSAlexey Orishko * licenses. You may choose this file to be licensed under the terms 16900d495aSAlexey Orishko * of the GNU General Public License (GPL) Version 2 or the 2-clause 17900d495aSAlexey Orishko * BSD license listed below: 18900d495aSAlexey Orishko * 19900d495aSAlexey Orishko * Redistribution and use in source and binary forms, with or without 20900d495aSAlexey Orishko * modification, are permitted provided that the following conditions 21900d495aSAlexey Orishko * are met: 22900d495aSAlexey Orishko * 1. Redistributions of source code must retain the above copyright 23900d495aSAlexey Orishko * notice, this list of conditions and the following disclaimer. 24900d495aSAlexey Orishko * 2. Redistributions in binary form must reproduce the above copyright 25900d495aSAlexey Orishko * notice, this list of conditions and the following disclaimer in the 26900d495aSAlexey Orishko * documentation and/or other materials provided with the distribution. 27900d495aSAlexey Orishko * 28900d495aSAlexey Orishko * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 29900d495aSAlexey Orishko * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30900d495aSAlexey Orishko * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31900d495aSAlexey Orishko * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 32900d495aSAlexey Orishko * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33900d495aSAlexey Orishko * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34900d495aSAlexey Orishko * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35900d495aSAlexey Orishko * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36900d495aSAlexey Orishko * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37900d495aSAlexey Orishko * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38900d495aSAlexey Orishko * SUCH DAMAGE. 39900d495aSAlexey Orishko */ 40900d495aSAlexey Orishko 41900d495aSAlexey Orishko #include <linux/module.h> 42900d495aSAlexey Orishko #include <linux/init.h> 43900d495aSAlexey Orishko #include <linux/netdevice.h> 44900d495aSAlexey Orishko #include <linux/ctype.h> 45900d495aSAlexey Orishko #include <linux/ethtool.h> 46900d495aSAlexey Orishko #include <linux/workqueue.h> 47900d495aSAlexey Orishko #include <linux/mii.h> 48900d495aSAlexey Orishko #include <linux/crc32.h> 49900d495aSAlexey Orishko #include <linux/usb.h> 50c84ff1d6SAlexey Orishko #include <linux/hrtimer.h> 51900d495aSAlexey Orishko #include <linux/atomic.h> 52900d495aSAlexey Orishko #include <linux/usb/usbnet.h> 53900d495aSAlexey Orishko #include <linux/usb/cdc.h> 54c91ce3b6SBjørn Mork #include <linux/usb/cdc_ncm.h> 55900d495aSAlexey Orishko 56c84ff1d6SAlexey Orishko #define DRIVER_VERSION "14-Mar-2012" 57900d495aSAlexey Orishko 58c84ff1d6SAlexey Orishko static void cdc_ncm_txpath_bh(unsigned long param); 59c84ff1d6SAlexey Orishko static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); 60c84ff1d6SAlexey Orishko static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); 61900d495aSAlexey Orishko static struct usb_driver cdc_ncm_driver; 62900d495aSAlexey Orishko 63900d495aSAlexey Orishko static void 64900d495aSAlexey Orishko cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) 65900d495aSAlexey Orishko { 66900d495aSAlexey Orishko struct usbnet *dev = netdev_priv(net); 67900d495aSAlexey Orishko 68900d495aSAlexey Orishko strncpy(info->driver, dev->driver_name, sizeof(info->driver)); 69900d495aSAlexey Orishko strncpy(info->version, DRIVER_VERSION, sizeof(info->version)); 70900d495aSAlexey Orishko strncpy(info->fw_version, dev->driver_info->description, 71900d495aSAlexey Orishko sizeof(info->fw_version)); 72900d495aSAlexey Orishko usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); 73900d495aSAlexey Orishko } 74900d495aSAlexey Orishko 75900d495aSAlexey Orishko static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx) 76900d495aSAlexey Orishko { 77900d495aSAlexey Orishko u32 val; 78900d495aSAlexey Orishko u8 flags; 79900d495aSAlexey Orishko u8 iface_no; 80900d495aSAlexey Orishko int err; 812d1c4310SGreg Suarez int eth_hlen; 8284e77a8bSAlexey Orishko u16 ntb_fmt_supported; 832d1c4310SGreg Suarez u32 min_dgram_size; 842d1c4310SGreg Suarez u32 min_hdr_size; 85900d495aSAlexey Orishko 86900d495aSAlexey Orishko iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 87900d495aSAlexey Orishko 8836c35416SGiuseppe Scrivano err = usb_control_msg(ctx->udev, 8936c35416SGiuseppe Scrivano usb_rcvctrlpipe(ctx->udev, 0), 9036c35416SGiuseppe Scrivano USB_CDC_GET_NTB_PARAMETERS, 9136c35416SGiuseppe Scrivano USB_TYPE_CLASS | USB_DIR_IN 9236c35416SGiuseppe Scrivano | USB_RECIP_INTERFACE, 9336c35416SGiuseppe Scrivano 0, iface_no, &ctx->ncm_parm, 9436c35416SGiuseppe Scrivano sizeof(ctx->ncm_parm), 10000); 9536c35416SGiuseppe Scrivano if (err < 0) { 96900d495aSAlexey Orishko pr_debug("failed GET_NTB_PARAMETERS\n"); 97900d495aSAlexey Orishko return 1; 98900d495aSAlexey Orishko } 99900d495aSAlexey Orishko 100900d495aSAlexey Orishko /* read correct set of parameters according to device mode */ 101900d495aSAlexey Orishko ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); 102900d495aSAlexey Orishko ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); 103900d495aSAlexey Orishko ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); 104900d495aSAlexey Orishko ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); 105900d495aSAlexey Orishko ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); 10684e77a8bSAlexey Orishko /* devices prior to NCM Errata shall set this field to zero */ 10784e77a8bSAlexey Orishko ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); 10884e77a8bSAlexey Orishko ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported); 109900d495aSAlexey Orishko 1102d1c4310SGreg Suarez eth_hlen = ETH_HLEN; 1112d1c4310SGreg Suarez min_dgram_size = CDC_NCM_MIN_DATAGRAM_SIZE; 1122d1c4310SGreg Suarez min_hdr_size = CDC_NCM_MIN_HDR_SIZE; 1132d1c4310SGreg Suarez if (ctx->mbim_desc != NULL) { 1142d1c4310SGreg Suarez flags = ctx->mbim_desc->bmNetworkCapabilities; 1152d1c4310SGreg Suarez eth_hlen = 0; 1162d1c4310SGreg Suarez min_dgram_size = CDC_MBIM_MIN_DATAGRAM_SIZE; 1172d1c4310SGreg Suarez min_hdr_size = 0; 1182d1c4310SGreg Suarez } else if (ctx->func_desc != NULL) { 119900d495aSAlexey Orishko flags = ctx->func_desc->bmNetworkCapabilities; 1202d1c4310SGreg Suarez } else { 121900d495aSAlexey Orishko flags = 0; 1222d1c4310SGreg Suarez } 123900d495aSAlexey Orishko 124900d495aSAlexey Orishko pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u " 125900d495aSAlexey Orishko "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u " 12684e77a8bSAlexey Orishko "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", 127900d495aSAlexey Orishko ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, 12884e77a8bSAlexey Orishko ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags); 129900d495aSAlexey Orishko 13084e77a8bSAlexey Orishko /* max count of tx datagrams */ 13184e77a8bSAlexey Orishko if ((ctx->tx_max_datagrams == 0) || 13284e77a8bSAlexey Orishko (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) 133900d495aSAlexey Orishko ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; 134900d495aSAlexey Orishko 135900d495aSAlexey Orishko /* verify maximum size of received NTB in bytes */ 13684e77a8bSAlexey Orishko if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) { 13784e77a8bSAlexey Orishko pr_debug("Using min receive length=%d\n", 13884e77a8bSAlexey Orishko USB_CDC_NCM_NTB_MIN_IN_SIZE); 13984e77a8bSAlexey Orishko ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE; 14084e77a8bSAlexey Orishko } 14184e77a8bSAlexey Orishko 14284e77a8bSAlexey Orishko if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) { 143900d495aSAlexey Orishko pr_debug("Using default maximum receive length=%d\n", 144900d495aSAlexey Orishko CDC_NCM_NTB_MAX_SIZE_RX); 145900d495aSAlexey Orishko ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX; 146900d495aSAlexey Orishko } 147900d495aSAlexey Orishko 14884e77a8bSAlexey Orishko /* inform device about NTB input size changes */ 14984e77a8bSAlexey Orishko if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) { 15075bc8ef5SJosh Boyer __le32 *dwNtbInMaxSize; 151dad957d7SBjørn Mork 152dad957d7SBjørn Mork dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize), GFP_KERNEL); 15375bc8ef5SJosh Boyer if (!dwNtbInMaxSize) { 15475bc8ef5SJosh Boyer err = -ENOMEM; 15575bc8ef5SJosh Boyer goto size_err; 15675bc8ef5SJosh Boyer } 15775bc8ef5SJosh Boyer *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max); 15875bc8ef5SJosh Boyer err = usb_control_msg(ctx->udev, 15975bc8ef5SJosh Boyer usb_sndctrlpipe(ctx->udev, 0), 16075bc8ef5SJosh Boyer USB_CDC_SET_NTB_INPUT_SIZE, 16175bc8ef5SJosh Boyer USB_TYPE_CLASS | USB_DIR_OUT 16275bc8ef5SJosh Boyer | USB_RECIP_INTERFACE, 16375bc8ef5SJosh Boyer 0, iface_no, dwNtbInMaxSize, 4, 1000); 16475bc8ef5SJosh Boyer kfree(dwNtbInMaxSize); 16575bc8ef5SJosh Boyer size_err: 16636c35416SGiuseppe Scrivano if (err < 0) 16784e77a8bSAlexey Orishko pr_debug("Setting NTB Input Size failed\n"); 16884e77a8bSAlexey Orishko } 16984e77a8bSAlexey Orishko 170900d495aSAlexey Orishko /* verify maximum size of transmitted NTB in bytes */ 171900d495aSAlexey Orishko if ((ctx->tx_max < 1722d1c4310SGreg Suarez (min_hdr_size + min_dgram_size)) || 173900d495aSAlexey Orishko (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) { 174900d495aSAlexey Orishko pr_debug("Using default maximum transmit length=%d\n", 175900d495aSAlexey Orishko CDC_NCM_NTB_MAX_SIZE_TX); 176900d495aSAlexey Orishko ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX; 177900d495aSAlexey Orishko } 178900d495aSAlexey Orishko 179900d495aSAlexey Orishko /* 180900d495aSAlexey Orishko * verify that the structure alignment is: 181900d495aSAlexey Orishko * - power of two 182900d495aSAlexey Orishko * - not greater than the maximum transmit length 183900d495aSAlexey Orishko * - not less than four bytes 184900d495aSAlexey Orishko */ 185900d495aSAlexey Orishko val = ctx->tx_ndp_modulus; 186900d495aSAlexey Orishko 187900d495aSAlexey Orishko if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 188900d495aSAlexey Orishko (val != ((-val) & val)) || (val >= ctx->tx_max)) { 189900d495aSAlexey Orishko pr_debug("Using default alignment: 4 bytes\n"); 190900d495aSAlexey Orishko ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 191900d495aSAlexey Orishko } 192900d495aSAlexey Orishko 193900d495aSAlexey Orishko /* 194900d495aSAlexey Orishko * verify that the payload alignment is: 195900d495aSAlexey Orishko * - power of two 196900d495aSAlexey Orishko * - not greater than the maximum transmit length 197900d495aSAlexey Orishko * - not less than four bytes 198900d495aSAlexey Orishko */ 199900d495aSAlexey Orishko val = ctx->tx_modulus; 200900d495aSAlexey Orishko 201900d495aSAlexey Orishko if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 202900d495aSAlexey Orishko (val != ((-val) & val)) || (val >= ctx->tx_max)) { 203900d495aSAlexey Orishko pr_debug("Using default transmit modulus: 4 bytes\n"); 204900d495aSAlexey Orishko ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 205900d495aSAlexey Orishko } 206900d495aSAlexey Orishko 207900d495aSAlexey Orishko /* verify the payload remainder */ 208900d495aSAlexey Orishko if (ctx->tx_remainder >= ctx->tx_modulus) { 209900d495aSAlexey Orishko pr_debug("Using default transmit remainder: 0 bytes\n"); 210900d495aSAlexey Orishko ctx->tx_remainder = 0; 211900d495aSAlexey Orishko } 212900d495aSAlexey Orishko 213900d495aSAlexey Orishko /* adjust TX-remainder according to NCM specification. */ 2142d1c4310SGreg Suarez ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) & 215900d495aSAlexey Orishko (ctx->tx_modulus - 1)); 216900d495aSAlexey Orishko 217900d495aSAlexey Orishko /* additional configuration */ 218900d495aSAlexey Orishko 219900d495aSAlexey Orishko /* set CRC Mode */ 22084e77a8bSAlexey Orishko if (flags & USB_CDC_NCM_NCAP_CRC_MODE) { 22136c35416SGiuseppe Scrivano err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), 22236c35416SGiuseppe Scrivano USB_CDC_SET_CRC_MODE, 22336c35416SGiuseppe Scrivano USB_TYPE_CLASS | USB_DIR_OUT 22436c35416SGiuseppe Scrivano | USB_RECIP_INTERFACE, 22536c35416SGiuseppe Scrivano USB_CDC_NCM_CRC_NOT_APPENDED, 22636c35416SGiuseppe Scrivano iface_no, NULL, 0, 1000); 22736c35416SGiuseppe Scrivano if (err < 0) 228900d495aSAlexey Orishko pr_debug("Setting CRC mode off failed\n"); 22984e77a8bSAlexey Orishko } 230900d495aSAlexey Orishko 23184e77a8bSAlexey Orishko /* set NTB format, if both formats are supported */ 23284e77a8bSAlexey Orishko if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) { 23336c35416SGiuseppe Scrivano err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), 23436c35416SGiuseppe Scrivano USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS 23536c35416SGiuseppe Scrivano | USB_DIR_OUT | USB_RECIP_INTERFACE, 23636c35416SGiuseppe Scrivano USB_CDC_NCM_NTB16_FORMAT, 23736c35416SGiuseppe Scrivano iface_no, NULL, 0, 1000); 23836c35416SGiuseppe Scrivano if (err < 0) 239900d495aSAlexey Orishko pr_debug("Setting NTB format to 16-bit failed\n"); 24084e77a8bSAlexey Orishko } 24184e77a8bSAlexey Orishko 2422d1c4310SGreg Suarez ctx->max_datagram_size = min_dgram_size; 243900d495aSAlexey Orishko 244900d495aSAlexey Orishko /* set Max Datagram Size (MTU) */ 24584e77a8bSAlexey Orishko if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) { 24675bc8ef5SJosh Boyer __le16 *max_datagram_size; 2472d1c4310SGreg Suarez u16 eth_max_sz; 2482d1c4310SGreg Suarez if (ctx->ether_desc != NULL) 2492d1c4310SGreg Suarez eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); 2502d1c4310SGreg Suarez else if (ctx->mbim_desc != NULL) 2512d1c4310SGreg Suarez eth_max_sz = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize); 2522d1c4310SGreg Suarez else 2532d1c4310SGreg Suarez goto max_dgram_err; 25475bc8ef5SJosh Boyer 25575bc8ef5SJosh Boyer max_datagram_size = kzalloc(sizeof(*max_datagram_size), 25675bc8ef5SJosh Boyer GFP_KERNEL); 25775bc8ef5SJosh Boyer if (!max_datagram_size) { 25875bc8ef5SJosh Boyer err = -ENOMEM; 25975bc8ef5SJosh Boyer goto max_dgram_err; 26075bc8ef5SJosh Boyer } 26175bc8ef5SJosh Boyer 26236c35416SGiuseppe Scrivano err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0), 26336c35416SGiuseppe Scrivano USB_CDC_GET_MAX_DATAGRAM_SIZE, 26436c35416SGiuseppe Scrivano USB_TYPE_CLASS | USB_DIR_IN 26536c35416SGiuseppe Scrivano | USB_RECIP_INTERFACE, 26675bc8ef5SJosh Boyer 0, iface_no, max_datagram_size, 26736c35416SGiuseppe Scrivano 2, 1000); 26836c35416SGiuseppe Scrivano if (err < 0) { 26984e77a8bSAlexey Orishko pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n", 2702d1c4310SGreg Suarez min_dgram_size); 271900d495aSAlexey Orishko } else { 27275bc8ef5SJosh Boyer ctx->max_datagram_size = 27375bc8ef5SJosh Boyer le16_to_cpu(*max_datagram_size); 27484e77a8bSAlexey Orishko /* Check Eth descriptor value */ 27584e77a8bSAlexey Orishko if (ctx->max_datagram_size > eth_max_sz) 27684e77a8bSAlexey Orishko ctx->max_datagram_size = eth_max_sz; 2773f658cdeSAlexey Orishko 2783f658cdeSAlexey Orishko if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE) 2792d1c4310SGreg Suarez ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE; 280900d495aSAlexey Orishko 2812d1c4310SGreg Suarez if (ctx->max_datagram_size < min_dgram_size) 2822d1c4310SGreg Suarez ctx->max_datagram_size = min_dgram_size; 28384e77a8bSAlexey Orishko 28484e77a8bSAlexey Orishko /* if value changed, update device */ 2853f658cdeSAlexey Orishko if (ctx->max_datagram_size != 2863f658cdeSAlexey Orishko le16_to_cpu(*max_datagram_size)) { 28736c35416SGiuseppe Scrivano err = usb_control_msg(ctx->udev, 28836c35416SGiuseppe Scrivano usb_sndctrlpipe(ctx->udev, 0), 28936c35416SGiuseppe Scrivano USB_CDC_SET_MAX_DATAGRAM_SIZE, 29036c35416SGiuseppe Scrivano USB_TYPE_CLASS | USB_DIR_OUT 29136c35416SGiuseppe Scrivano | USB_RECIP_INTERFACE, 29236c35416SGiuseppe Scrivano 0, 29375bc8ef5SJosh Boyer iface_no, max_datagram_size, 29436c35416SGiuseppe Scrivano 2, 1000); 29536c35416SGiuseppe Scrivano if (err < 0) 2963f658cdeSAlexey Orishko pr_debug("SET_MAX_DGRAM_SIZE failed\n"); 2973f658cdeSAlexey Orishko } 2983f658cdeSAlexey Orishko } 2993f658cdeSAlexey Orishko kfree(max_datagram_size); 30084e77a8bSAlexey Orishko } 30184e77a8bSAlexey Orishko 3023f658cdeSAlexey Orishko max_dgram_err: 3032d1c4310SGreg Suarez if (ctx->netdev->mtu != (ctx->max_datagram_size - eth_hlen)) 3042d1c4310SGreg Suarez ctx->netdev->mtu = ctx->max_datagram_size - eth_hlen; 305900d495aSAlexey Orishko 306900d495aSAlexey Orishko return 0; 307900d495aSAlexey Orishko } 308900d495aSAlexey Orishko 309900d495aSAlexey Orishko static void 310900d495aSAlexey Orishko cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf) 311900d495aSAlexey Orishko { 312900d495aSAlexey Orishko struct usb_host_endpoint *e; 313900d495aSAlexey Orishko u8 ep; 314900d495aSAlexey Orishko 315900d495aSAlexey Orishko for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { 316900d495aSAlexey Orishko 317900d495aSAlexey Orishko e = intf->cur_altsetting->endpoint + ep; 318900d495aSAlexey Orishko switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 319900d495aSAlexey Orishko case USB_ENDPOINT_XFER_INT: 320900d495aSAlexey Orishko if (usb_endpoint_dir_in(&e->desc)) { 321900d495aSAlexey Orishko if (ctx->status_ep == NULL) 322900d495aSAlexey Orishko ctx->status_ep = e; 323900d495aSAlexey Orishko } 324900d495aSAlexey Orishko break; 325900d495aSAlexey Orishko 326900d495aSAlexey Orishko case USB_ENDPOINT_XFER_BULK: 327900d495aSAlexey Orishko if (usb_endpoint_dir_in(&e->desc)) { 328900d495aSAlexey Orishko if (ctx->in_ep == NULL) 329900d495aSAlexey Orishko ctx->in_ep = e; 330900d495aSAlexey Orishko } else { 331900d495aSAlexey Orishko if (ctx->out_ep == NULL) 332900d495aSAlexey Orishko ctx->out_ep = e; 333900d495aSAlexey Orishko } 334900d495aSAlexey Orishko break; 335900d495aSAlexey Orishko 336900d495aSAlexey Orishko default: 337900d495aSAlexey Orishko break; 338900d495aSAlexey Orishko } 339900d495aSAlexey Orishko } 340900d495aSAlexey Orishko } 341900d495aSAlexey Orishko 342900d495aSAlexey Orishko static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) 343900d495aSAlexey Orishko { 344900d495aSAlexey Orishko if (ctx == NULL) 345900d495aSAlexey Orishko return; 346900d495aSAlexey Orishko 347900d495aSAlexey Orishko if (ctx->tx_rem_skb != NULL) { 348900d495aSAlexey Orishko dev_kfree_skb_any(ctx->tx_rem_skb); 349900d495aSAlexey Orishko ctx->tx_rem_skb = NULL; 350900d495aSAlexey Orishko } 351900d495aSAlexey Orishko 352900d495aSAlexey Orishko if (ctx->tx_curr_skb != NULL) { 353900d495aSAlexey Orishko dev_kfree_skb_any(ctx->tx_curr_skb); 354900d495aSAlexey Orishko ctx->tx_curr_skb = NULL; 355900d495aSAlexey Orishko } 356900d495aSAlexey Orishko 357900d495aSAlexey Orishko kfree(ctx); 358900d495aSAlexey Orishko } 359900d495aSAlexey Orishko 360f94898eaSDan Williams static const struct ethtool_ops cdc_ncm_ethtool_ops = { 361f94898eaSDan Williams .get_drvinfo = cdc_ncm_get_drvinfo, 362f94898eaSDan Williams .get_link = usbnet_get_link, 363f94898eaSDan Williams .get_msglevel = usbnet_get_msglevel, 364f94898eaSDan Williams .set_msglevel = usbnet_set_msglevel, 365f94898eaSDan Williams .get_settings = usbnet_get_settings, 366f94898eaSDan Williams .set_settings = usbnet_set_settings, 367f94898eaSDan Williams .nway_reset = usbnet_nway_reset, 368f94898eaSDan Williams }; 369f94898eaSDan Williams 370c91ce3b6SBjørn Mork int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting) 371900d495aSAlexey Orishko { 372900d495aSAlexey Orishko struct cdc_ncm_ctx *ctx; 373900d495aSAlexey Orishko struct usb_driver *driver; 374900d495aSAlexey Orishko u8 *buf; 375900d495aSAlexey Orishko int len; 376900d495aSAlexey Orishko int temp; 377900d495aSAlexey Orishko u8 iface_no; 378900d495aSAlexey Orishko 379c796984fSThomas Meyer ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 380900d495aSAlexey Orishko if (ctx == NULL) 38119694ac8SAlexey Orishko return -ENODEV; 382900d495aSAlexey Orishko 383c84ff1d6SAlexey Orishko hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 384c84ff1d6SAlexey Orishko ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; 385c84ff1d6SAlexey Orishko ctx->bh.data = (unsigned long)ctx; 386c84ff1d6SAlexey Orishko ctx->bh.func = cdc_ncm_txpath_bh; 387c84ff1d6SAlexey Orishko atomic_set(&ctx->stop, 0); 388900d495aSAlexey Orishko spin_lock_init(&ctx->mtx); 389900d495aSAlexey Orishko ctx->netdev = dev->net; 390900d495aSAlexey Orishko 391900d495aSAlexey Orishko /* store ctx pointer in device data field */ 392900d495aSAlexey Orishko dev->data[0] = (unsigned long)ctx; 393900d495aSAlexey Orishko 394900d495aSAlexey Orishko /* get some pointers */ 395900d495aSAlexey Orishko driver = driver_of(intf); 396900d495aSAlexey Orishko buf = intf->cur_altsetting->extra; 397900d495aSAlexey Orishko len = intf->cur_altsetting->extralen; 398900d495aSAlexey Orishko 399900d495aSAlexey Orishko ctx->udev = dev->udev; 400900d495aSAlexey Orishko ctx->intf = intf; 401900d495aSAlexey Orishko 402900d495aSAlexey Orishko /* parse through descriptors associated with control interface */ 403900d495aSAlexey Orishko while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { 404900d495aSAlexey Orishko 405900d495aSAlexey Orishko if (buf[1] != USB_DT_CS_INTERFACE) 406900d495aSAlexey Orishko goto advance; 407900d495aSAlexey Orishko 408900d495aSAlexey Orishko switch (buf[2]) { 409900d495aSAlexey Orishko case USB_CDC_UNION_TYPE: 410900d495aSAlexey Orishko if (buf[0] < sizeof(*(ctx->union_desc))) 411900d495aSAlexey Orishko break; 412900d495aSAlexey Orishko 413900d495aSAlexey Orishko ctx->union_desc = 414900d495aSAlexey Orishko (const struct usb_cdc_union_desc *)buf; 415900d495aSAlexey Orishko 416900d495aSAlexey Orishko ctx->control = usb_ifnum_to_if(dev->udev, 417900d495aSAlexey Orishko ctx->union_desc->bMasterInterface0); 418900d495aSAlexey Orishko ctx->data = usb_ifnum_to_if(dev->udev, 419900d495aSAlexey Orishko ctx->union_desc->bSlaveInterface0); 420900d495aSAlexey Orishko break; 421900d495aSAlexey Orishko 422900d495aSAlexey Orishko case USB_CDC_ETHERNET_TYPE: 423900d495aSAlexey Orishko if (buf[0] < sizeof(*(ctx->ether_desc))) 424900d495aSAlexey Orishko break; 425900d495aSAlexey Orishko 426900d495aSAlexey Orishko ctx->ether_desc = 427900d495aSAlexey Orishko (const struct usb_cdc_ether_desc *)buf; 428900d495aSAlexey Orishko dev->hard_mtu = 429900d495aSAlexey Orishko le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); 430900d495aSAlexey Orishko 43184e77a8bSAlexey Orishko if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE) 43284e77a8bSAlexey Orishko dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE; 43384e77a8bSAlexey Orishko else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE) 43484e77a8bSAlexey Orishko dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE; 435900d495aSAlexey Orishko break; 436900d495aSAlexey Orishko 437900d495aSAlexey Orishko case USB_CDC_NCM_TYPE: 438900d495aSAlexey Orishko if (buf[0] < sizeof(*(ctx->func_desc))) 439900d495aSAlexey Orishko break; 440900d495aSAlexey Orishko 441900d495aSAlexey Orishko ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; 442900d495aSAlexey Orishko break; 443900d495aSAlexey Orishko 44438396e4cSGreg Suarez case USB_CDC_MBIM_TYPE: 44538396e4cSGreg Suarez if (buf[0] < sizeof(*(ctx->mbim_desc))) 44638396e4cSGreg Suarez break; 44738396e4cSGreg Suarez 44838396e4cSGreg Suarez ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf; 44938396e4cSGreg Suarez break; 45038396e4cSGreg Suarez 451900d495aSAlexey Orishko default: 452900d495aSAlexey Orishko break; 453900d495aSAlexey Orishko } 454900d495aSAlexey Orishko advance: 455900d495aSAlexey Orishko /* advance to next descriptor */ 456900d495aSAlexey Orishko temp = buf[0]; 457900d495aSAlexey Orishko buf += temp; 458900d495aSAlexey Orishko len -= temp; 459900d495aSAlexey Orishko } 460900d495aSAlexey Orishko 461900d495aSAlexey Orishko /* check if we got everything */ 462900d495aSAlexey Orishko if ((ctx->control == NULL) || (ctx->data == NULL) || 46338396e4cSGreg Suarez ((!ctx->mbim_desc) && ((ctx->ether_desc == NULL) || (ctx->control != intf)))) 464900d495aSAlexey Orishko goto error; 465900d495aSAlexey Orishko 466900d495aSAlexey Orishko /* claim interfaces, if any */ 467900d495aSAlexey Orishko temp = usb_driver_claim_interface(driver, ctx->data, dev); 468900d495aSAlexey Orishko if (temp) 469900d495aSAlexey Orishko goto error; 470900d495aSAlexey Orishko 471900d495aSAlexey Orishko iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; 472900d495aSAlexey Orishko 473900d495aSAlexey Orishko /* reset data interface */ 474900d495aSAlexey Orishko temp = usb_set_interface(dev->udev, iface_no, 0); 475900d495aSAlexey Orishko if (temp) 47619694ac8SAlexey Orishko goto error2; 477900d495aSAlexey Orishko 478900d495aSAlexey Orishko /* initialize data interface */ 479900d495aSAlexey Orishko if (cdc_ncm_setup(ctx)) 48019694ac8SAlexey Orishko goto error2; 481900d495aSAlexey Orishko 482900d495aSAlexey Orishko /* configure data interface */ 48338396e4cSGreg Suarez temp = usb_set_interface(dev->udev, iface_no, data_altsetting); 484900d495aSAlexey Orishko if (temp) 48519694ac8SAlexey Orishko goto error2; 486900d495aSAlexey Orishko 487900d495aSAlexey Orishko cdc_ncm_find_endpoints(ctx, ctx->data); 488900d495aSAlexey Orishko cdc_ncm_find_endpoints(ctx, ctx->control); 489900d495aSAlexey Orishko 490900d495aSAlexey Orishko if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) || 491900d495aSAlexey Orishko (ctx->status_ep == NULL)) 49219694ac8SAlexey Orishko goto error2; 493900d495aSAlexey Orishko 494900d495aSAlexey Orishko dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; 495900d495aSAlexey Orishko 496900d495aSAlexey Orishko usb_set_intfdata(ctx->data, dev); 497900d495aSAlexey Orishko usb_set_intfdata(ctx->control, dev); 498900d495aSAlexey Orishko usb_set_intfdata(ctx->intf, dev); 499900d495aSAlexey Orishko 50038396e4cSGreg Suarez if (ctx->ether_desc) { 501900d495aSAlexey Orishko temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); 502900d495aSAlexey Orishko if (temp) 50319694ac8SAlexey Orishko goto error2; 504517cd81cSDanny Kukawka dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr); 50538396e4cSGreg Suarez } 50638396e4cSGreg Suarez 507900d495aSAlexey Orishko 508900d495aSAlexey Orishko dev->in = usb_rcvbulkpipe(dev->udev, 509900d495aSAlexey Orishko ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 510900d495aSAlexey Orishko dev->out = usb_sndbulkpipe(dev->udev, 511900d495aSAlexey Orishko ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 512900d495aSAlexey Orishko dev->status = ctx->status_ep; 513900d495aSAlexey Orishko dev->rx_urb_size = ctx->rx_max; 514900d495aSAlexey Orishko 515900d495aSAlexey Orishko ctx->tx_speed = ctx->rx_speed = 0; 516900d495aSAlexey Orishko return 0; 517900d495aSAlexey Orishko 51819694ac8SAlexey Orishko error2: 51919694ac8SAlexey Orishko usb_set_intfdata(ctx->control, NULL); 52019694ac8SAlexey Orishko usb_set_intfdata(ctx->data, NULL); 52119694ac8SAlexey Orishko usb_driver_release_interface(driver, ctx->data); 522900d495aSAlexey Orishko error: 523900d495aSAlexey Orishko cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); 524900d495aSAlexey Orishko dev->data[0] = 0; 52519694ac8SAlexey Orishko dev_info(&dev->udev->dev, "bind() failure\n"); 526900d495aSAlexey Orishko return -ENODEV; 527900d495aSAlexey Orishko } 528c91ce3b6SBjørn Mork EXPORT_SYMBOL_GPL(cdc_ncm_bind_common); 529900d495aSAlexey Orishko 530c91ce3b6SBjørn Mork void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) 531900d495aSAlexey Orishko { 532900d495aSAlexey Orishko struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 53319694ac8SAlexey Orishko struct usb_driver *driver = driver_of(intf); 534900d495aSAlexey Orishko 535900d495aSAlexey Orishko if (ctx == NULL) 536900d495aSAlexey Orishko return; /* no setup */ 537900d495aSAlexey Orishko 538c84ff1d6SAlexey Orishko atomic_set(&ctx->stop, 1); 539c84ff1d6SAlexey Orishko 540c84ff1d6SAlexey Orishko if (hrtimer_active(&ctx->tx_timer)) 541c84ff1d6SAlexey Orishko hrtimer_cancel(&ctx->tx_timer); 542c84ff1d6SAlexey Orishko 543c84ff1d6SAlexey Orishko tasklet_kill(&ctx->bh); 544c84ff1d6SAlexey Orishko 54519694ac8SAlexey Orishko /* disconnect master --> disconnect slave */ 54619694ac8SAlexey Orishko if (intf == ctx->control && ctx->data) { 547900d495aSAlexey Orishko usb_set_intfdata(ctx->data, NULL); 548900d495aSAlexey Orishko usb_driver_release_interface(driver, ctx->data); 54919694ac8SAlexey Orishko ctx->data = NULL; 550900d495aSAlexey Orishko 55119694ac8SAlexey Orishko } else if (intf == ctx->data && ctx->control) { 55219694ac8SAlexey Orishko usb_set_intfdata(ctx->control, NULL); 553900d495aSAlexey Orishko usb_driver_release_interface(driver, ctx->control); 55419694ac8SAlexey Orishko ctx->control = NULL; 555900d495aSAlexey Orishko } 556900d495aSAlexey Orishko 55719694ac8SAlexey Orishko usb_set_intfdata(ctx->intf, NULL); 558900d495aSAlexey Orishko cdc_ncm_free(ctx); 559900d495aSAlexey Orishko } 560c91ce3b6SBjørn Mork EXPORT_SYMBOL_GPL(cdc_ncm_unbind); 561900d495aSAlexey Orishko 56238396e4cSGreg Suarez static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) 56338396e4cSGreg Suarez { 56438396e4cSGreg Suarez int ret; 56538396e4cSGreg Suarez 566bd329e12SBjørn Mork /* The MBIM spec defines a NCM compatible default altsetting, 567bd329e12SBjørn Mork * which we may have matched: 568bd329e12SBjørn Mork * 569bd329e12SBjørn Mork * "Functions that implement both NCM 1.0 and MBIM (an 570bd329e12SBjørn Mork * “NCM/MBIM function”) according to this recommendation 571bd329e12SBjørn Mork * shall provide two alternate settings for the 572bd329e12SBjørn Mork * Communication Interface. Alternate setting 0, and the 573bd329e12SBjørn Mork * associated class and endpoint descriptors, shall be 574bd329e12SBjørn Mork * constructed according to the rules given for the 575bd329e12SBjørn Mork * Communication Interface in section 5 of [USBNCM10]. 576bd329e12SBjørn Mork * Alternate setting 1, and the associated class and 577bd329e12SBjørn Mork * endpoint descriptors, shall be constructed according to 578bd329e12SBjørn Mork * the rules given in section 6 (USB Device Model) of this 579bd329e12SBjørn Mork * specification." 580bd329e12SBjørn Mork * 581bd329e12SBjørn Mork * Do not bind to such interfaces, allowing cdc_mbim to handle 582bd329e12SBjørn Mork * them 583bd329e12SBjørn Mork */ 584bd329e12SBjørn Mork #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM) 585bd329e12SBjørn Mork if ((intf->num_altsetting == 2) && 586bd329e12SBjørn Mork !usb_set_interface(dev->udev, 587bd329e12SBjørn Mork intf->cur_altsetting->desc.bInterfaceNumber, 588bd329e12SBjørn Mork CDC_NCM_COMM_ALTSETTING_MBIM) && 589bd329e12SBjørn Mork cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) 590bd329e12SBjørn Mork return -ENODEV; 591bd329e12SBjørn Mork #endif 592bd329e12SBjørn Mork 59338396e4cSGreg Suarez /* NCM data altsetting is always 1 */ 59438396e4cSGreg Suarez ret = cdc_ncm_bind_common(dev, intf, 1); 59538396e4cSGreg Suarez 59638396e4cSGreg Suarez /* 59738396e4cSGreg Suarez * We should get an event when network connection is "connected" or 59838396e4cSGreg Suarez * "disconnected". Set network connection in "disconnected" state 59938396e4cSGreg Suarez * (carrier is OFF) during attach, so the IP network stack does not 60038396e4cSGreg Suarez * start IPv6 negotiation and more. 60138396e4cSGreg Suarez */ 60238396e4cSGreg Suarez netif_carrier_off(dev->net); 60338396e4cSGreg Suarez return ret; 60438396e4cSGreg Suarez } 60538396e4cSGreg Suarez 606c78b7c58SBjørn Mork static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max) 607900d495aSAlexey Orishko { 608c78b7c58SBjørn Mork size_t align = ALIGN(skb->len, modulus) - skb->len + remainder; 609c78b7c58SBjørn Mork 610c78b7c58SBjørn Mork if (skb->len + align > max) 611c78b7c58SBjørn Mork align = max - skb->len; 612c78b7c58SBjørn Mork if (align && skb_tailroom(skb) >= align) 613c78b7c58SBjørn Mork memset(skb_put(skb, align), 0, align); 614c78b7c58SBjørn Mork } 615c78b7c58SBjørn Mork 616c78b7c58SBjørn Mork /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly 617c78b7c58SBjørn Mork * allocating a new one within skb 618c78b7c58SBjørn Mork */ 619c78b7c58SBjørn Mork static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) 620c78b7c58SBjørn Mork { 621c78b7c58SBjørn Mork struct usb_cdc_ncm_ndp16 *ndp16 = NULL; 622c78b7c58SBjørn Mork struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data; 623c78b7c58SBjørn Mork size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex); 624c78b7c58SBjørn Mork 625c78b7c58SBjørn Mork /* follow the chain of NDPs, looking for a match */ 626c78b7c58SBjørn Mork while (ndpoffset) { 627c78b7c58SBjørn Mork ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset); 628c78b7c58SBjørn Mork if (ndp16->dwSignature == sign) 629c78b7c58SBjørn Mork return ndp16; 630c78b7c58SBjørn Mork ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 631c78b7c58SBjørn Mork } 632c78b7c58SBjørn Mork 633c78b7c58SBjørn Mork /* align new NDP */ 634c78b7c58SBjørn Mork cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max); 635c78b7c58SBjørn Mork 636c78b7c58SBjørn Mork /* verify that there is room for the NDP and the datagram (reserve) */ 637c78b7c58SBjørn Mork if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE) 638c78b7c58SBjørn Mork return NULL; 639c78b7c58SBjørn Mork 640c78b7c58SBjørn Mork /* link to it */ 641c78b7c58SBjørn Mork if (ndp16) 642c78b7c58SBjørn Mork ndp16->wNextNdpIndex = cpu_to_le16(skb->len); 643c78b7c58SBjørn Mork else 644c78b7c58SBjørn Mork nth16->wNdpIndex = cpu_to_le16(skb->len); 645c78b7c58SBjørn Mork 646c78b7c58SBjørn Mork /* push a new empty NDP */ 647c78b7c58SBjørn Mork ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE); 648c78b7c58SBjørn Mork ndp16->dwSignature = sign; 649c78b7c58SBjørn Mork ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16)); 650c78b7c58SBjørn Mork return ndp16; 651900d495aSAlexey Orishko } 652900d495aSAlexey Orishko 653c91ce3b6SBjørn Mork struct sk_buff * 654c78b7c58SBjørn Mork cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign) 655900d495aSAlexey Orishko { 656c78b7c58SBjørn Mork struct usb_cdc_ncm_nth16 *nth16; 657c78b7c58SBjørn Mork struct usb_cdc_ncm_ndp16 *ndp16; 658900d495aSAlexey Orishko struct sk_buff *skb_out; 659c78b7c58SBjørn Mork u16 n = 0, index, ndplen; 66084e77a8bSAlexey Orishko u8 ready2send = 0; 661900d495aSAlexey Orishko 662900d495aSAlexey Orishko /* if there is a remaining skb, it gets priority */ 663c78b7c58SBjørn Mork if (skb != NULL) { 664900d495aSAlexey Orishko swap(skb, ctx->tx_rem_skb); 665c78b7c58SBjørn Mork swap(sign, ctx->tx_rem_sign); 666c78b7c58SBjørn Mork } else { 66784e77a8bSAlexey Orishko ready2send = 1; 668c78b7c58SBjørn Mork } 669900d495aSAlexey Orishko 670900d495aSAlexey Orishko /* check if we are resuming an OUT skb */ 671900d495aSAlexey Orishko skb_out = ctx->tx_curr_skb; 672900d495aSAlexey Orishko 673c78b7c58SBjørn Mork /* allocate a new OUT skb */ 674c78b7c58SBjørn Mork if (!skb_out) { 6756c60408eSAlexey Orishko skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC); 676900d495aSAlexey Orishko if (skb_out == NULL) { 677900d495aSAlexey Orishko if (skb != NULL) { 678900d495aSAlexey Orishko dev_kfree_skb_any(skb); 679900d495aSAlexey Orishko ctx->netdev->stats.tx_dropped++; 680900d495aSAlexey Orishko } 681900d495aSAlexey Orishko goto exit_no_skb; 682900d495aSAlexey Orishko } 683c78b7c58SBjørn Mork /* fill out the initial 16-bit NTB header */ 684c78b7c58SBjørn Mork nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16)); 685c78b7c58SBjørn Mork nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); 686c78b7c58SBjørn Mork nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)); 687c78b7c58SBjørn Mork nth16->wSequence = cpu_to_le16(ctx->tx_seq++); 688900d495aSAlexey Orishko 689c78b7c58SBjørn Mork /* count total number of frames in this NTB */ 690900d495aSAlexey Orishko ctx->tx_curr_frame_num = 0; 691900d495aSAlexey Orishko } 692900d495aSAlexey Orishko 693c78b7c58SBjørn Mork for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) { 694c78b7c58SBjørn Mork /* send any remaining skb first */ 695900d495aSAlexey Orishko if (skb == NULL) { 696900d495aSAlexey Orishko skb = ctx->tx_rem_skb; 697c78b7c58SBjørn Mork sign = ctx->tx_rem_sign; 698900d495aSAlexey Orishko ctx->tx_rem_skb = NULL; 699900d495aSAlexey Orishko 700900d495aSAlexey Orishko /* check for end of skb */ 701900d495aSAlexey Orishko if (skb == NULL) 702900d495aSAlexey Orishko break; 703900d495aSAlexey Orishko } 704900d495aSAlexey Orishko 705c78b7c58SBjørn Mork /* get the appropriate NDP for this skb */ 706c78b7c58SBjørn Mork ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); 707c78b7c58SBjørn Mork 708c78b7c58SBjørn Mork /* align beginning of next frame */ 709c78b7c58SBjørn Mork cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max); 710c78b7c58SBjørn Mork 711c78b7c58SBjørn Mork /* check if we had enough room left for both NDP and frame */ 712c78b7c58SBjørn Mork if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) { 713900d495aSAlexey Orishko if (n == 0) { 714900d495aSAlexey Orishko /* won't fit, MTU problem? */ 715900d495aSAlexey Orishko dev_kfree_skb_any(skb); 716900d495aSAlexey Orishko skb = NULL; 717900d495aSAlexey Orishko ctx->netdev->stats.tx_dropped++; 718900d495aSAlexey Orishko } else { 719900d495aSAlexey Orishko /* no room for skb - store for later */ 720900d495aSAlexey Orishko if (ctx->tx_rem_skb != NULL) { 721900d495aSAlexey Orishko dev_kfree_skb_any(ctx->tx_rem_skb); 722900d495aSAlexey Orishko ctx->netdev->stats.tx_dropped++; 723900d495aSAlexey Orishko } 724900d495aSAlexey Orishko ctx->tx_rem_skb = skb; 725c78b7c58SBjørn Mork ctx->tx_rem_sign = sign; 726900d495aSAlexey Orishko skb = NULL; 72784e77a8bSAlexey Orishko ready2send = 1; 728900d495aSAlexey Orishko } 729900d495aSAlexey Orishko break; 730900d495aSAlexey Orishko } 731900d495aSAlexey Orishko 732c78b7c58SBjørn Mork /* calculate frame number withing this NDP */ 733c78b7c58SBjørn Mork ndplen = le16_to_cpu(ndp16->wLength); 734c78b7c58SBjørn Mork index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1; 735900d495aSAlexey Orishko 736c78b7c58SBjørn Mork /* OK, add this skb */ 737c78b7c58SBjørn Mork ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len); 738c78b7c58SBjørn Mork ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len); 739c78b7c58SBjørn Mork ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16)); 740c78b7c58SBjørn Mork memcpy(skb_put(skb_out, skb->len), skb->data, skb->len); 741900d495aSAlexey Orishko dev_kfree_skb_any(skb); 742900d495aSAlexey Orishko skb = NULL; 743c78b7c58SBjørn Mork 744c78b7c58SBjørn Mork /* send now if this NDP is full */ 745c78b7c58SBjørn Mork if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) { 746c78b7c58SBjørn Mork ready2send = 1; 747c78b7c58SBjørn Mork break; 748c78b7c58SBjørn Mork } 749900d495aSAlexey Orishko } 750900d495aSAlexey Orishko 751900d495aSAlexey Orishko /* free up any dangling skb */ 752900d495aSAlexey Orishko if (skb != NULL) { 753900d495aSAlexey Orishko dev_kfree_skb_any(skb); 754900d495aSAlexey Orishko skb = NULL; 755900d495aSAlexey Orishko ctx->netdev->stats.tx_dropped++; 756900d495aSAlexey Orishko } 757900d495aSAlexey Orishko 758900d495aSAlexey Orishko ctx->tx_curr_frame_num = n; 759900d495aSAlexey Orishko 760900d495aSAlexey Orishko if (n == 0) { 761900d495aSAlexey Orishko /* wait for more frames */ 762900d495aSAlexey Orishko /* push variables */ 763900d495aSAlexey Orishko ctx->tx_curr_skb = skb_out; 764900d495aSAlexey Orishko goto exit_no_skb; 765900d495aSAlexey Orishko 76684e77a8bSAlexey Orishko } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) { 767900d495aSAlexey Orishko /* wait for more frames */ 768900d495aSAlexey Orishko /* push variables */ 769900d495aSAlexey Orishko ctx->tx_curr_skb = skb_out; 770900d495aSAlexey Orishko /* set the pending count */ 771900d495aSAlexey Orishko if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) 772c84ff1d6SAlexey Orishko ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; 773900d495aSAlexey Orishko goto exit_no_skb; 774900d495aSAlexey Orishko 775900d495aSAlexey Orishko } else { 776900d495aSAlexey Orishko /* frame goes out */ 777900d495aSAlexey Orishko /* variables will be reset at next call */ 778900d495aSAlexey Orishko } 779900d495aSAlexey Orishko 780900d495aSAlexey Orishko /* 781900d495aSAlexey Orishko * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes, 782900d495aSAlexey Orishko * we send buffers as it is. If we get more data, it would be more 783900d495aSAlexey Orishko * efficient for USB HS mobile device with DMA engine to receive a full 784900d495aSAlexey Orishko * size NTB, than canceling DMA transfer and receiving a short packet. 785900d495aSAlexey Orishko */ 786c78b7c58SBjørn Mork if (skb_out->len > CDC_NCM_MIN_TX_PKT) 787900d495aSAlexey Orishko /* final zero padding */ 788c78b7c58SBjørn Mork memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0, ctx->tx_max - skb_out->len); 789900d495aSAlexey Orishko 790c78b7c58SBjørn Mork /* do we need to prevent a ZLP? */ 791c78b7c58SBjørn Mork if (((skb_out->len % le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0) && 792c78b7c58SBjørn Mork (skb_out->len < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)) && skb_tailroom(skb_out)) 793c78b7c58SBjørn Mork *skb_put(skb_out, 1) = 0; /* force short packet */ 794900d495aSAlexey Orishko 795c78b7c58SBjørn Mork /* set final frame length */ 796c78b7c58SBjørn Mork nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 797c78b7c58SBjørn Mork nth16->wBlockLength = cpu_to_le16(skb_out->len); 798900d495aSAlexey Orishko 799900d495aSAlexey Orishko /* return skb */ 800900d495aSAlexey Orishko ctx->tx_curr_skb = NULL; 801c84ff1d6SAlexey Orishko ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num; 802900d495aSAlexey Orishko return skb_out; 803900d495aSAlexey Orishko 804900d495aSAlexey Orishko exit_no_skb: 805c84ff1d6SAlexey Orishko /* Start timer, if there is a remaining skb */ 806c84ff1d6SAlexey Orishko if (ctx->tx_curr_skb != NULL) 807c84ff1d6SAlexey Orishko cdc_ncm_tx_timeout_start(ctx); 808900d495aSAlexey Orishko return NULL; 809900d495aSAlexey Orishko } 810c91ce3b6SBjørn Mork EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame); 811900d495aSAlexey Orishko 812900d495aSAlexey Orishko static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) 813900d495aSAlexey Orishko { 814900d495aSAlexey Orishko /* start timer, if not already started */ 815c84ff1d6SAlexey Orishko if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) 816c84ff1d6SAlexey Orishko hrtimer_start(&ctx->tx_timer, 817c84ff1d6SAlexey Orishko ktime_set(0, CDC_NCM_TIMER_INTERVAL), 818c84ff1d6SAlexey Orishko HRTIMER_MODE_REL); 819900d495aSAlexey Orishko } 820900d495aSAlexey Orishko 821c84ff1d6SAlexey Orishko static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) 822900d495aSAlexey Orishko { 823c84ff1d6SAlexey Orishko struct cdc_ncm_ctx *ctx = 824c84ff1d6SAlexey Orishko container_of(timer, struct cdc_ncm_ctx, tx_timer); 825900d495aSAlexey Orishko 826c84ff1d6SAlexey Orishko if (!atomic_read(&ctx->stop)) 827c84ff1d6SAlexey Orishko tasklet_schedule(&ctx->bh); 828c84ff1d6SAlexey Orishko return HRTIMER_NORESTART; 829c84ff1d6SAlexey Orishko } 830c84ff1d6SAlexey Orishko 831c84ff1d6SAlexey Orishko static void cdc_ncm_txpath_bh(unsigned long param) 832c84ff1d6SAlexey Orishko { 833c84ff1d6SAlexey Orishko struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param; 834c84ff1d6SAlexey Orishko 835c84ff1d6SAlexey Orishko spin_lock_bh(&ctx->mtx); 836900d495aSAlexey Orishko if (ctx->tx_timer_pending != 0) { 837900d495aSAlexey Orishko ctx->tx_timer_pending--; 838900d495aSAlexey Orishko cdc_ncm_tx_timeout_start(ctx); 839c84ff1d6SAlexey Orishko spin_unlock_bh(&ctx->mtx); 840f742aa8aSAlexey Orishko } else if (ctx->netdev != NULL) { 841c84ff1d6SAlexey Orishko spin_unlock_bh(&ctx->mtx); 842c84ff1d6SAlexey Orishko netif_tx_lock_bh(ctx->netdev); 843900d495aSAlexey Orishko usbnet_start_xmit(NULL, ctx->netdev); 844c84ff1d6SAlexey Orishko netif_tx_unlock_bh(ctx->netdev); 845900d495aSAlexey Orishko } 846f742aa8aSAlexey Orishko } 847900d495aSAlexey Orishko 848900d495aSAlexey Orishko static struct sk_buff * 849900d495aSAlexey Orishko cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) 850900d495aSAlexey Orishko { 851900d495aSAlexey Orishko struct sk_buff *skb_out; 852900d495aSAlexey Orishko struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 853900d495aSAlexey Orishko 854900d495aSAlexey Orishko /* 855900d495aSAlexey Orishko * The Ethernet API we are using does not support transmitting 856900d495aSAlexey Orishko * multiple Ethernet frames in a single call. This driver will 857900d495aSAlexey Orishko * accumulate multiple Ethernet frames and send out a larger 858900d495aSAlexey Orishko * USB frame when the USB buffer is full or when a single jiffies 859900d495aSAlexey Orishko * timeout happens. 860900d495aSAlexey Orishko */ 861900d495aSAlexey Orishko if (ctx == NULL) 862900d495aSAlexey Orishko goto error; 863900d495aSAlexey Orishko 864c84ff1d6SAlexey Orishko spin_lock_bh(&ctx->mtx); 865c78b7c58SBjørn Mork skb_out = cdc_ncm_fill_tx_frame(ctx, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)); 866c84ff1d6SAlexey Orishko spin_unlock_bh(&ctx->mtx); 867900d495aSAlexey Orishko return skb_out; 868900d495aSAlexey Orishko 869900d495aSAlexey Orishko error: 870900d495aSAlexey Orishko if (skb != NULL) 871900d495aSAlexey Orishko dev_kfree_skb_any(skb); 872900d495aSAlexey Orishko 873900d495aSAlexey Orishko return NULL; 874900d495aSAlexey Orishko } 875900d495aSAlexey Orishko 876ff06ab13SBjørn Mork /* verify NTB header and return offset of first NDP, or negative error */ 877c91ce3b6SBjørn Mork int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) 878900d495aSAlexey Orishko { 879d5ddb4a5SAlexey Orishko struct usb_cdc_ncm_nth16 *nth16; 880ff06ab13SBjørn Mork int len; 881ff06ab13SBjørn Mork int ret = -EINVAL; 882900d495aSAlexey Orishko 883900d495aSAlexey Orishko if (ctx == NULL) 884900d495aSAlexey Orishko goto error; 885900d495aSAlexey Orishko 886d5ddb4a5SAlexey Orishko if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + 887d5ddb4a5SAlexey Orishko sizeof(struct usb_cdc_ncm_ndp16))) { 888900d495aSAlexey Orishko pr_debug("frame too short\n"); 889900d495aSAlexey Orishko goto error; 890900d495aSAlexey Orishko } 891900d495aSAlexey Orishko 892d5ddb4a5SAlexey Orishko nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; 893900d495aSAlexey Orishko 894d5ddb4a5SAlexey Orishko if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) { 895900d495aSAlexey Orishko pr_debug("invalid NTH16 signature <%u>\n", 896d5ddb4a5SAlexey Orishko le32_to_cpu(nth16->dwSignature)); 897900d495aSAlexey Orishko goto error; 898900d495aSAlexey Orishko } 899900d495aSAlexey Orishko 900d5ddb4a5SAlexey Orishko len = le16_to_cpu(nth16->wBlockLength); 901d5ddb4a5SAlexey Orishko if (len > ctx->rx_max) { 902d5ddb4a5SAlexey Orishko pr_debug("unsupported NTB block length %u/%u\n", len, 903d5ddb4a5SAlexey Orishko ctx->rx_max); 904900d495aSAlexey Orishko goto error; 905900d495aSAlexey Orishko } 906900d495aSAlexey Orishko 907d5ddb4a5SAlexey Orishko if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && 908d5ddb4a5SAlexey Orishko (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && 909d5ddb4a5SAlexey Orishko !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { 910d5ddb4a5SAlexey Orishko pr_debug("sequence number glitch prev=%d curr=%d\n", 911d5ddb4a5SAlexey Orishko ctx->rx_seq, le16_to_cpu(nth16->wSequence)); 912d5ddb4a5SAlexey Orishko } 913d5ddb4a5SAlexey Orishko ctx->rx_seq = le16_to_cpu(nth16->wSequence); 914d5ddb4a5SAlexey Orishko 915ff06ab13SBjørn Mork ret = le16_to_cpu(nth16->wNdpIndex); 916ff06ab13SBjørn Mork error: 917ff06ab13SBjørn Mork return ret; 918ff06ab13SBjørn Mork } 919c91ce3b6SBjørn Mork EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16); 920ff06ab13SBjørn Mork 921ff06ab13SBjørn Mork /* verify NDP header and return number of datagrams, or negative error */ 922c91ce3b6SBjørn Mork int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset) 923ff06ab13SBjørn Mork { 924ff06ab13SBjørn Mork struct usb_cdc_ncm_ndp16 *ndp16; 925ff06ab13SBjørn Mork int ret = -EINVAL; 926ff06ab13SBjørn Mork 92775d67d35SBjørn Mork if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { 92875d67d35SBjørn Mork pr_debug("invalid NDP offset <%u>\n", ndpoffset); 929900d495aSAlexey Orishko goto error; 930900d495aSAlexey Orishko } 93175d67d35SBjørn Mork ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 932900d495aSAlexey Orishko 933ff06ab13SBjørn Mork if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { 934ff06ab13SBjørn Mork pr_debug("invalid DPT16 length <%u>\n", 935ff06ab13SBjørn Mork le32_to_cpu(ndp16->dwSignature)); 936ff06ab13SBjørn Mork goto error; 937ff06ab13SBjørn Mork } 938ff06ab13SBjørn Mork 939ff06ab13SBjørn Mork ret = ((le16_to_cpu(ndp16->wLength) - 940ff06ab13SBjørn Mork sizeof(struct usb_cdc_ncm_ndp16)) / 941ff06ab13SBjørn Mork sizeof(struct usb_cdc_ncm_dpe16)); 942ff06ab13SBjørn Mork ret--; /* we process NDP entries except for the last one */ 943ff06ab13SBjørn Mork 944ff06ab13SBjørn Mork if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) > 945ff06ab13SBjørn Mork skb_in->len) { 946ff06ab13SBjørn Mork pr_debug("Invalid nframes = %d\n", ret); 947ff06ab13SBjørn Mork ret = -EINVAL; 948ff06ab13SBjørn Mork } 949ff06ab13SBjørn Mork 950ff06ab13SBjørn Mork error: 951ff06ab13SBjørn Mork return ret; 952ff06ab13SBjørn Mork } 953c91ce3b6SBjørn Mork EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16); 954ff06ab13SBjørn Mork 955ff06ab13SBjørn Mork static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) 956ff06ab13SBjørn Mork { 957ff06ab13SBjørn Mork struct sk_buff *skb; 958ff06ab13SBjørn Mork struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 959ff06ab13SBjørn Mork int len; 960ff06ab13SBjørn Mork int nframes; 961ff06ab13SBjørn Mork int x; 962ff06ab13SBjørn Mork int offset; 963ff06ab13SBjørn Mork struct usb_cdc_ncm_ndp16 *ndp16; 964ff06ab13SBjørn Mork struct usb_cdc_ncm_dpe16 *dpe16; 965ff06ab13SBjørn Mork int ndpoffset; 966ff06ab13SBjørn Mork int loopcount = 50; /* arbitrary max preventing infinite loop */ 967ff06ab13SBjørn Mork 968ff06ab13SBjørn Mork ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); 969ff06ab13SBjørn Mork if (ndpoffset < 0) 970ff06ab13SBjørn Mork goto error; 971ff06ab13SBjørn Mork 972ff06ab13SBjørn Mork next_ndp: 973ff06ab13SBjørn Mork nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); 974ff06ab13SBjørn Mork if (nframes < 0) 975ff06ab13SBjørn Mork goto error; 976ff06ab13SBjørn Mork 977ff06ab13SBjørn Mork ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 978ff06ab13SBjørn Mork 979d5ddb4a5SAlexey Orishko if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) { 980900d495aSAlexey Orishko pr_debug("invalid DPT16 signature <%u>\n", 981d5ddb4a5SAlexey Orishko le32_to_cpu(ndp16->dwSignature)); 98275d67d35SBjørn Mork goto err_ndp; 983900d495aSAlexey Orishko } 984ff06ab13SBjørn Mork dpe16 = ndp16->dpe16; 985900d495aSAlexey Orishko 986d5ddb4a5SAlexey Orishko for (x = 0; x < nframes; x++, dpe16++) { 987d5ddb4a5SAlexey Orishko offset = le16_to_cpu(dpe16->wDatagramIndex); 988d5ddb4a5SAlexey Orishko len = le16_to_cpu(dpe16->wDatagramLength); 989900d495aSAlexey Orishko 990900d495aSAlexey Orishko /* 991900d495aSAlexey Orishko * CDC NCM ch. 3.7 992900d495aSAlexey Orishko * All entries after first NULL entry are to be ignored 993900d495aSAlexey Orishko */ 994d5ddb4a5SAlexey Orishko if ((offset == 0) || (len == 0)) { 995900d495aSAlexey Orishko if (!x) 99675d67d35SBjørn Mork goto err_ndp; /* empty NTB */ 997900d495aSAlexey Orishko break; 998900d495aSAlexey Orishko } 999900d495aSAlexey Orishko 1000900d495aSAlexey Orishko /* sanity checking */ 1001d5ddb4a5SAlexey Orishko if (((offset + len) > skb_in->len) || 1002d5ddb4a5SAlexey Orishko (len > ctx->rx_max) || (len < ETH_HLEN)) { 1003900d495aSAlexey Orishko pr_debug("invalid frame detected (ignored)" 1004900d495aSAlexey Orishko "offset[%u]=%u, length=%u, skb=%p\n", 1005d5ddb4a5SAlexey Orishko x, offset, len, skb_in); 1006900d495aSAlexey Orishko if (!x) 100775d67d35SBjørn Mork goto err_ndp; 1008900d495aSAlexey Orishko break; 1009900d495aSAlexey Orishko 1010900d495aSAlexey Orishko } else { 1011900d495aSAlexey Orishko skb = skb_clone(skb_in, GFP_ATOMIC); 10129e56790aSJesper Juhl if (!skb) 10139e56790aSJesper Juhl goto error; 1014d5ddb4a5SAlexey Orishko skb->len = len; 1015900d495aSAlexey Orishko skb->data = ((u8 *)skb_in->data) + offset; 1016d5ddb4a5SAlexey Orishko skb_set_tail_pointer(skb, len); 1017900d495aSAlexey Orishko usbnet_skb_return(dev, skb); 1018900d495aSAlexey Orishko } 1019900d495aSAlexey Orishko } 102075d67d35SBjørn Mork err_ndp: 102175d67d35SBjørn Mork /* are there more NDPs to process? */ 102275d67d35SBjørn Mork ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 102375d67d35SBjørn Mork if (ndpoffset && loopcount--) 102475d67d35SBjørn Mork goto next_ndp; 102575d67d35SBjørn Mork 1026900d495aSAlexey Orishko return 1; 1027900d495aSAlexey Orishko error: 1028900d495aSAlexey Orishko return 0; 1029900d495aSAlexey Orishko } 1030900d495aSAlexey Orishko 1031900d495aSAlexey Orishko static void 1032900d495aSAlexey Orishko cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx, 103384e77a8bSAlexey Orishko struct usb_cdc_speed_change *data) 1034900d495aSAlexey Orishko { 103584e77a8bSAlexey Orishko uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); 103684e77a8bSAlexey Orishko uint32_t tx_speed = le32_to_cpu(data->ULBitRate); 1037900d495aSAlexey Orishko 1038900d495aSAlexey Orishko /* 1039900d495aSAlexey Orishko * Currently the USB-NET API does not support reporting the actual 1040900d495aSAlexey Orishko * device speed. Do print it instead. 1041900d495aSAlexey Orishko */ 1042900d495aSAlexey Orishko if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) { 1043900d495aSAlexey Orishko ctx->tx_speed = tx_speed; 1044900d495aSAlexey Orishko ctx->rx_speed = rx_speed; 1045900d495aSAlexey Orishko 1046900d495aSAlexey Orishko if ((tx_speed > 1000000) && (rx_speed > 1000000)) { 1047900d495aSAlexey Orishko printk(KERN_INFO KBUILD_MODNAME 1048900d495aSAlexey Orishko ": %s: %u mbit/s downlink " 1049900d495aSAlexey Orishko "%u mbit/s uplink\n", 1050900d495aSAlexey Orishko ctx->netdev->name, 1051900d495aSAlexey Orishko (unsigned int)(rx_speed / 1000000U), 1052900d495aSAlexey Orishko (unsigned int)(tx_speed / 1000000U)); 1053900d495aSAlexey Orishko } else { 1054900d495aSAlexey Orishko printk(KERN_INFO KBUILD_MODNAME 1055900d495aSAlexey Orishko ": %s: %u kbit/s downlink " 1056900d495aSAlexey Orishko "%u kbit/s uplink\n", 1057900d495aSAlexey Orishko ctx->netdev->name, 1058900d495aSAlexey Orishko (unsigned int)(rx_speed / 1000U), 1059900d495aSAlexey Orishko (unsigned int)(tx_speed / 1000U)); 1060900d495aSAlexey Orishko } 1061900d495aSAlexey Orishko } 1062900d495aSAlexey Orishko } 1063900d495aSAlexey Orishko 1064900d495aSAlexey Orishko static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) 1065900d495aSAlexey Orishko { 1066900d495aSAlexey Orishko struct cdc_ncm_ctx *ctx; 1067900d495aSAlexey Orishko struct usb_cdc_notification *event; 1068900d495aSAlexey Orishko 1069900d495aSAlexey Orishko ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1070900d495aSAlexey Orishko 1071900d495aSAlexey Orishko if (urb->actual_length < sizeof(*event)) 1072900d495aSAlexey Orishko return; 1073900d495aSAlexey Orishko 1074900d495aSAlexey Orishko /* test for split data in 8-byte chunks */ 1075900d495aSAlexey Orishko if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { 1076900d495aSAlexey Orishko cdc_ncm_speed_change(ctx, 107784e77a8bSAlexey Orishko (struct usb_cdc_speed_change *)urb->transfer_buffer); 1078900d495aSAlexey Orishko return; 1079900d495aSAlexey Orishko } 1080900d495aSAlexey Orishko 1081900d495aSAlexey Orishko event = urb->transfer_buffer; 1082900d495aSAlexey Orishko 1083900d495aSAlexey Orishko switch (event->bNotificationType) { 1084900d495aSAlexey Orishko case USB_CDC_NOTIFY_NETWORK_CONNECTION: 1085900d495aSAlexey Orishko /* 1086900d495aSAlexey Orishko * According to the CDC NCM specification ch.7.1 1087900d495aSAlexey Orishko * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be 1088900d495aSAlexey Orishko * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. 1089900d495aSAlexey Orishko */ 1090900d495aSAlexey Orishko ctx->connected = event->wValue; 1091900d495aSAlexey Orishko 1092900d495aSAlexey Orishko printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:" 1093900d495aSAlexey Orishko " %sconnected\n", 1094900d495aSAlexey Orishko ctx->netdev->name, ctx->connected ? "" : "dis"); 1095900d495aSAlexey Orishko 1096900d495aSAlexey Orishko if (ctx->connected) 1097900d495aSAlexey Orishko netif_carrier_on(dev->net); 1098900d495aSAlexey Orishko else { 1099900d495aSAlexey Orishko netif_carrier_off(dev->net); 1100900d495aSAlexey Orishko ctx->tx_speed = ctx->rx_speed = 0; 1101900d495aSAlexey Orishko } 1102900d495aSAlexey Orishko break; 1103900d495aSAlexey Orishko 1104900d495aSAlexey Orishko case USB_CDC_NOTIFY_SPEED_CHANGE: 110584e77a8bSAlexey Orishko if (urb->actual_length < (sizeof(*event) + 110684e77a8bSAlexey Orishko sizeof(struct usb_cdc_speed_change))) 1107900d495aSAlexey Orishko set_bit(EVENT_STS_SPLIT, &dev->flags); 1108900d495aSAlexey Orishko else 1109900d495aSAlexey Orishko cdc_ncm_speed_change(ctx, 111084e77a8bSAlexey Orishko (struct usb_cdc_speed_change *) &event[1]); 1111900d495aSAlexey Orishko break; 1112900d495aSAlexey Orishko 1113900d495aSAlexey Orishko default: 1114900d495aSAlexey Orishko dev_err(&dev->udev->dev, "NCM: unexpected " 1115900d495aSAlexey Orishko "notification 0x%02x!\n", event->bNotificationType); 1116900d495aSAlexey Orishko break; 1117900d495aSAlexey Orishko } 1118900d495aSAlexey Orishko } 1119900d495aSAlexey Orishko 1120900d495aSAlexey Orishko static int cdc_ncm_check_connect(struct usbnet *dev) 1121900d495aSAlexey Orishko { 1122900d495aSAlexey Orishko struct cdc_ncm_ctx *ctx; 1123900d495aSAlexey Orishko 1124900d495aSAlexey Orishko ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1125900d495aSAlexey Orishko if (ctx == NULL) 1126900d495aSAlexey Orishko return 1; /* disconnected */ 1127900d495aSAlexey Orishko 1128900d495aSAlexey Orishko return !ctx->connected; 1129900d495aSAlexey Orishko } 1130900d495aSAlexey Orishko 1131900d495aSAlexey Orishko static int 1132900d495aSAlexey Orishko cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod) 1133900d495aSAlexey Orishko { 1134900d495aSAlexey Orishko return usbnet_probe(udev, prod); 1135900d495aSAlexey Orishko } 1136900d495aSAlexey Orishko 1137900d495aSAlexey Orishko static void cdc_ncm_disconnect(struct usb_interface *intf) 1138900d495aSAlexey Orishko { 1139900d495aSAlexey Orishko struct usbnet *dev = usb_get_intfdata(intf); 1140900d495aSAlexey Orishko 1141900d495aSAlexey Orishko if (dev == NULL) 1142900d495aSAlexey Orishko return; /* already disconnected */ 1143900d495aSAlexey Orishko 1144900d495aSAlexey Orishko usbnet_disconnect(intf); 1145900d495aSAlexey Orishko } 1146900d495aSAlexey Orishko 1147900d495aSAlexey Orishko static int cdc_ncm_manage_power(struct usbnet *dev, int status) 1148900d495aSAlexey Orishko { 1149900d495aSAlexey Orishko dev->intf->needs_remote_wakeup = status; 1150900d495aSAlexey Orishko return 0; 1151900d495aSAlexey Orishko } 1152900d495aSAlexey Orishko 1153900d495aSAlexey Orishko static const struct driver_info cdc_ncm_info = { 1154900d495aSAlexey Orishko .description = "CDC NCM", 1155c261344dSArnd Bergmann .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, 1156900d495aSAlexey Orishko .bind = cdc_ncm_bind, 1157900d495aSAlexey Orishko .unbind = cdc_ncm_unbind, 1158900d495aSAlexey Orishko .check_connect = cdc_ncm_check_connect, 1159900d495aSAlexey Orishko .manage_power = cdc_ncm_manage_power, 1160900d495aSAlexey Orishko .status = cdc_ncm_status, 1161900d495aSAlexey Orishko .rx_fixup = cdc_ncm_rx_fixup, 1162900d495aSAlexey Orishko .tx_fixup = cdc_ncm_tx_fixup, 1163900d495aSAlexey Orishko }; 1164900d495aSAlexey Orishko 1165f94898eaSDan Williams /* Same as cdc_ncm_info, but with FLAG_WWAN */ 1166f94898eaSDan Williams static const struct driver_info wwan_info = { 1167f94898eaSDan Williams .description = "Mobile Broadband Network Device", 1168f94898eaSDan Williams .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1169f94898eaSDan Williams | FLAG_WWAN, 1170f94898eaSDan Williams .bind = cdc_ncm_bind, 1171f94898eaSDan Williams .unbind = cdc_ncm_unbind, 1172f94898eaSDan Williams .check_connect = cdc_ncm_check_connect, 1173f94898eaSDan Williams .manage_power = cdc_ncm_manage_power, 1174f94898eaSDan Williams .status = cdc_ncm_status, 1175f94898eaSDan Williams .rx_fixup = cdc_ncm_rx_fixup, 1176f94898eaSDan Williams .tx_fixup = cdc_ncm_tx_fixup, 1177f94898eaSDan Williams }; 1178f94898eaSDan Williams 1179f94898eaSDan Williams static const struct usb_device_id cdc_devs[] = { 1180f94898eaSDan Williams /* Ericsson MBM devices like F5521gw */ 1181f94898eaSDan Williams { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1182f94898eaSDan Williams | USB_DEVICE_ID_MATCH_VENDOR, 1183f94898eaSDan Williams .idVendor = 0x0bdb, 1184f94898eaSDan Williams .bInterfaceClass = USB_CLASS_COMM, 1185f94898eaSDan Williams .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1186f94898eaSDan Williams .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1187f94898eaSDan Williams .driver_info = (unsigned long) &wwan_info, 1188f94898eaSDan Williams }, 1189f94898eaSDan Williams 1190f3a1ef9cSPeter Meiser /* Dell branded MBM devices like DW5550 */ 1191f3a1ef9cSPeter Meiser { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1192f3a1ef9cSPeter Meiser | USB_DEVICE_ID_MATCH_VENDOR, 1193f3a1ef9cSPeter Meiser .idVendor = 0x413c, 1194f3a1ef9cSPeter Meiser .bInterfaceClass = USB_CLASS_COMM, 1195f3a1ef9cSPeter Meiser .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1196f3a1ef9cSPeter Meiser .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1197f3a1ef9cSPeter Meiser .driver_info = (unsigned long) &wwan_info, 1198f3a1ef9cSPeter Meiser }, 1199f3a1ef9cSPeter Meiser 1200f3a1ef9cSPeter Meiser /* Toshiba branded MBM devices */ 1201f3a1ef9cSPeter Meiser { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1202f3a1ef9cSPeter Meiser | USB_DEVICE_ID_MATCH_VENDOR, 1203f3a1ef9cSPeter Meiser .idVendor = 0x0930, 1204f3a1ef9cSPeter Meiser .bInterfaceClass = USB_CLASS_COMM, 1205f3a1ef9cSPeter Meiser .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1206f3a1ef9cSPeter Meiser .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1207f3a1ef9cSPeter Meiser .driver_info = (unsigned long) &wwan_info, 1208f3a1ef9cSPeter Meiser }, 1209f3a1ef9cSPeter Meiser 1210f94898eaSDan Williams /* Generic CDC-NCM devices */ 1211f94898eaSDan Williams { USB_INTERFACE_INFO(USB_CLASS_COMM, 1212f94898eaSDan Williams USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1213f94898eaSDan Williams .driver_info = (unsigned long)&cdc_ncm_info, 1214f94898eaSDan Williams }, 1215f94898eaSDan Williams { 1216f94898eaSDan Williams }, 1217f94898eaSDan Williams }; 1218f94898eaSDan Williams MODULE_DEVICE_TABLE(usb, cdc_devs); 1219f94898eaSDan Williams 1220900d495aSAlexey Orishko static struct usb_driver cdc_ncm_driver = { 1221900d495aSAlexey Orishko .name = "cdc_ncm", 1222900d495aSAlexey Orishko .id_table = cdc_devs, 1223900d495aSAlexey Orishko .probe = cdc_ncm_probe, 1224900d495aSAlexey Orishko .disconnect = cdc_ncm_disconnect, 1225900d495aSAlexey Orishko .suspend = usbnet_suspend, 1226900d495aSAlexey Orishko .resume = usbnet_resume, 122785e3c65fSStefan Metzmacher .reset_resume = usbnet_resume, 1228900d495aSAlexey Orishko .supports_autosuspend = 1, 1229e1f12eb6SSarah Sharp .disable_hub_initiated_lpm = 1, 1230900d495aSAlexey Orishko }; 1231900d495aSAlexey Orishko 1232d632eb1bSGreg Kroah-Hartman module_usb_driver(cdc_ncm_driver); 1233900d495aSAlexey Orishko 1234900d495aSAlexey Orishko MODULE_AUTHOR("Hans Petter Selasky"); 1235900d495aSAlexey Orishko MODULE_DESCRIPTION("USB CDC NCM host driver"); 1236900d495aSAlexey Orishko MODULE_LICENSE("Dual BSD/GPL"); 1237