David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack |
| 3 | * |
| 4 | * Copyright (C) 2003-2005,2008 David Brownell |
| 5 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger |
| 6 | * Copyright (C) 2008 Nokia Corporation |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | /* #define VERBOSE_DEBUG */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
Sebastian Andrzej Siewior | 9830317 | 2012-09-10 16:30:50 +0200 | [diff] [blame] | 17 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/gfp.h> |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 19 | #include <linux/device.h> |
| 20 | #include <linux/ctype.h> |
| 21 | #include <linux/etherdevice.h> |
| 22 | #include <linux/ethtool.h> |
Ian Coolidge | 4fe5f07 | 2012-11-07 14:39:18 +0000 | [diff] [blame] | 23 | #include <linux/if_vlan.h> |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 24 | #include <linux/if_arp.h> |
| 25 | #include <linux/msm_rmnet.h> |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 26 | |
| 27 | #include "u_ether.h" |
| 28 | |
| 29 | |
| 30 | /* |
| 31 | * This component encapsulates the Ethernet link glue needed to provide |
| 32 | * one (!) network link through the USB gadget stack, normally "usb0". |
| 33 | * |
| 34 | * The control and data models are handled by the function driver which |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 35 | * connects to this code; such as CDC Ethernet (ECM or EEM), |
| 36 | * "CDC Subset", or RNDIS. That includes all descriptor and endpoint |
| 37 | * management. |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 38 | * |
| 39 | * Link level addressing is handled by this component using module |
| 40 | * parameters; if no such parameters are provided, random link level |
| 41 | * addresses are used. Each end of the link uses one address. The |
| 42 | * host end address is exported in various ways, and is often recorded |
| 43 | * in configuration databases. |
| 44 | * |
| 45 | * The driver which assembles each configuration using such a link is |
| 46 | * responsible for ensuring that each configuration includes at most one |
| 47 | * instance of is network link. (The network layer provides ways for |
| 48 | * this single "physical" link to be used by multiple virtual links.) |
| 49 | */ |
| 50 | |
David Brownell | 8a1ce2c | 2008-08-18 17:43:56 -0700 | [diff] [blame] | 51 | #define UETH__VERSION "29-May-2008" |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 52 | |
Mike Looijmans | bba787a | 2015-08-05 08:54:55 +0200 | [diff] [blame] | 53 | /* Experiments show that both Linux and Windows hosts allow up to 16k |
| 54 | * frame sizes. Set the max size to 15k+52 to prevent allocating 32k |
| 55 | * blocks and still have efficient handling. */ |
| 56 | #define GETHER_MAX_ETH_FRAME_LEN 15412 |
| 57 | |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 58 | static struct workqueue_struct *uether_wq; |
| 59 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 60 | struct eth_dev { |
| 61 | /* lock is held while accessing port_usb |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 62 | */ |
| 63 | spinlock_t lock; |
| 64 | struct gether *port_usb; |
| 65 | |
| 66 | struct net_device *net; |
| 67 | struct usb_gadget *gadget; |
| 68 | |
| 69 | spinlock_t req_lock; /* guard {rx,tx}_reqs */ |
| 70 | struct list_head tx_reqs, rx_reqs; |
Badhri Jagan Sridharan | cb6a786 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 71 | unsigned tx_qlen; |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 72 | /* Minimum number of TX USB request queued to UDC */ |
| 73 | #define TX_REQ_THRESHOLD 5 |
| 74 | int no_tx_req_used; |
| 75 | int tx_skb_hold_count; |
| 76 | u32 tx_req_bufsize; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 77 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 78 | struct sk_buff_head rx_frames; |
| 79 | |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 80 | unsigned qmult; |
| 81 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 82 | unsigned header_len; |
xerox_lin | 87bebf8 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 83 | unsigned ul_max_pkts_per_xfer; |
xerox_lin | cdffcb8 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 84 | unsigned dl_max_pkts_per_xfer; |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 85 | struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb); |
| 86 | int (*unwrap)(struct gether *, |
| 87 | struct sk_buff *skb, |
| 88 | struct sk_buff_head *list); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 89 | |
| 90 | struct work_struct work; |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 91 | struct work_struct rx_work; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 92 | |
| 93 | unsigned long todo; |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 94 | unsigned long flags; |
| 95 | unsigned short rx_needed_headroom; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 96 | #define WORK_RX_MEMORY 0 |
| 97 | |
| 98 | bool zlp; |
Yoshihiro Shimoda | 05f6b0f | 2016-08-22 17:48:26 +0900 | [diff] [blame] | 99 | bool no_skb_reserve; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 100 | u8 host_mac[ETH_ALEN]; |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 101 | u8 dev_mac[ETH_ALEN]; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 102 | }; |
| 103 | |
| 104 | /*-------------------------------------------------------------------------*/ |
| 105 | |
| 106 | #define RX_EXTRA 20 /* bytes guarding against rx overflows */ |
| 107 | |
| 108 | #define DEFAULT_QLEN 2 /* double buffering by default */ |
| 109 | |
Paul Zimmerman | 04617db | 2011-06-27 14:13:18 -0700 | [diff] [blame] | 110 | /* for dual-speed hardware, use deeper queues at high/super speed */ |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 111 | static inline int qlen(struct usb_gadget *gadget, unsigned qmult) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 112 | { |
Paul Zimmerman | 04617db | 2011-06-27 14:13:18 -0700 | [diff] [blame] | 113 | if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH || |
| 114 | gadget->speed == USB_SPEED_SUPER)) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 115 | return qmult * DEFAULT_QLEN; |
| 116 | else |
| 117 | return DEFAULT_QLEN; |
| 118 | } |
| 119 | |
| 120 | /*-------------------------------------------------------------------------*/ |
| 121 | |
| 122 | /* REVISIT there must be a better way than having two sets |
| 123 | * of debug calls ... |
| 124 | */ |
| 125 | |
| 126 | #undef DBG |
| 127 | #undef VDBG |
| 128 | #undef ERROR |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 129 | #undef INFO |
| 130 | |
| 131 | #define xprintk(d, level, fmt, args...) \ |
| 132 | printk(level "%s: " fmt , (d)->net->name , ## args) |
| 133 | |
| 134 | #ifdef DEBUG |
| 135 | #undef DEBUG |
| 136 | #define DBG(dev, fmt, args...) \ |
| 137 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 138 | #else |
| 139 | #define DBG(dev, fmt, args...) \ |
| 140 | do { } while (0) |
| 141 | #endif /* DEBUG */ |
| 142 | |
| 143 | #ifdef VERBOSE_DEBUG |
| 144 | #define VDBG DBG |
| 145 | #else |
| 146 | #define VDBG(dev, fmt, args...) \ |
| 147 | do { } while (0) |
| 148 | #endif /* DEBUG */ |
| 149 | |
| 150 | #define ERROR(dev, fmt, args...) \ |
| 151 | xprintk(dev , KERN_ERR , fmt , ## args) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 152 | #define INFO(dev, fmt, args...) \ |
| 153 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 154 | |
| 155 | /*-------------------------------------------------------------------------*/ |
| 156 | |
| 157 | /* NETWORK DRIVER HOOKUP (to the layer above this driver) */ |
| 158 | |
Stephen Hemminger | ccad637 | 2008-11-19 22:42:31 -0800 | [diff] [blame] | 159 | static int ueth_change_mtu(struct net_device *net, int new_mtu) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 160 | { |
Mike Looijmans | ab738ff | 2015-11-30 12:18:23 +0100 | [diff] [blame] | 161 | if (new_mtu <= ETH_HLEN || new_mtu > GETHER_MAX_ETH_FRAME_LEN) |
| 162 | return -ERANGE; |
| 163 | net->mtu = new_mtu; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 164 | |
Mike Looijmans | ab738ff | 2015-11-30 12:18:23 +0100 | [diff] [blame] | 165 | return 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 168 | static int ueth_change_mtu_ip(struct net_device *net, int new_mtu) |
| 169 | { |
| 170 | struct eth_dev *dev = netdev_priv(net); |
| 171 | unsigned long flags; |
| 172 | int status = 0; |
| 173 | |
| 174 | spin_lock_irqsave(&dev->lock, flags); |
| 175 | if (new_mtu <= 0) |
| 176 | status = -EINVAL; |
| 177 | else |
| 178 | net->mtu = new_mtu; |
| 179 | |
| 180 | DBG(dev, "[%s] MTU change: old=%d new=%d\n", net->name, |
| 181 | net->mtu, new_mtu); |
| 182 | spin_unlock_irqrestore(&dev->lock, flags); |
| 183 | |
| 184 | return status; |
| 185 | } |
| 186 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 187 | static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p) |
| 188 | { |
Jiri Pirko | 7826d43 | 2013-01-06 00:44:26 +0000 | [diff] [blame] | 189 | struct eth_dev *dev = netdev_priv(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 190 | |
Jiri Pirko | 7826d43 | 2013-01-06 00:44:26 +0000 | [diff] [blame] | 191 | strlcpy(p->driver, "g_ether", sizeof(p->driver)); |
| 192 | strlcpy(p->version, UETH__VERSION, sizeof(p->version)); |
| 193 | strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version)); |
| 194 | strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info)); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 195 | } |
| 196 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 197 | /* REVISIT can also support: |
| 198 | * - WOL (by tracking suspends and issuing remote wakeup) |
| 199 | * - msglevel (implies updated messaging) |
| 200 | * - ... probably more ethtool ops |
| 201 | */ |
| 202 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 203 | static const struct ethtool_ops ops = { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 204 | .get_drvinfo = eth_get_drvinfo, |
Jonathan McDowell | 237e75b | 2009-03-26 00:45:27 -0700 | [diff] [blame] | 205 | .get_link = ethtool_op_get_link, |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 206 | }; |
| 207 | |
| 208 | static void defer_kevent(struct eth_dev *dev, int flag) |
| 209 | { |
| 210 | if (test_and_set_bit(flag, &dev->todo)) |
| 211 | return; |
| 212 | if (!schedule_work(&dev->work)) |
| 213 | ERROR(dev, "kevent %d may have been dropped\n", flag); |
| 214 | else |
| 215 | DBG(dev, "kevent %d scheduled\n", flag); |
| 216 | } |
| 217 | |
| 218 | static void rx_complete(struct usb_ep *ep, struct usb_request *req); |
| 219 | |
| 220 | static int |
| 221 | rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) |
| 222 | { |
| 223 | struct sk_buff *skb; |
| 224 | int retval = -ENOMEM; |
| 225 | size_t size = 0; |
| 226 | struct usb_ep *out; |
| 227 | unsigned long flags; |
| 228 | |
| 229 | spin_lock_irqsave(&dev->lock, flags); |
| 230 | if (dev->port_usb) |
| 231 | out = dev->port_usb->out_ep; |
| 232 | else |
| 233 | out = NULL; |
| 234 | spin_unlock_irqrestore(&dev->lock, flags); |
| 235 | |
| 236 | if (!out) |
| 237 | return -ENOTCONN; |
| 238 | |
| 239 | |
| 240 | /* Padding up to RX_EXTRA handles minor disagreements with host. |
| 241 | * Normally we use the USB "terminate on short read" convention; |
| 242 | * so allow up to (N*maxpacket), since that memory is normally |
| 243 | * already allocated. Some hardware doesn't deal well with short |
| 244 | * reads (e.g. DMA must be N*maxpacket), so for now don't trim a |
| 245 | * byte off the end (to force hardware errors on overflow). |
| 246 | * |
| 247 | * RNDIS uses internal framing, and explicitly allows senders to |
| 248 | * pad to end-of-packet. That's potentially nice for speed, but |
| 249 | * means receivers can't recover lost synch on their own (because |
| 250 | * new packets don't only start after a short RX). |
| 251 | */ |
| 252 | size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA; |
| 253 | size += dev->port_usb->header_len; |
| 254 | size += out->maxpacket - 1; |
| 255 | size -= size % out->maxpacket; |
| 256 | |
xerox_lin | 87bebf8 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 257 | if (dev->ul_max_pkts_per_xfer) |
| 258 | size *= dev->ul_max_pkts_per_xfer; |
| 259 | |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 260 | if (dev->port_usb->is_fixed) |
Stephen Hemminger | 45d1b7a | 2011-03-01 22:40:57 -0800 | [diff] [blame] | 261 | size = max_t(size_t, size, dev->port_usb->fixed_out_len); |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 262 | |
Amit Pundir | 5ff0eb2 | 2016-01-08 19:36:02 +0530 | [diff] [blame] | 263 | DBG(dev, "%s: size: %zd\n", __func__, size); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 264 | skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags); |
| 265 | if (skb == NULL) { |
| 266 | DBG(dev, "no rx skb\n"); |
| 267 | goto enomem; |
| 268 | } |
| 269 | |
| 270 | /* Some platforms perform better when IP packets are aligned, |
| 271 | * but on at least one, checksumming fails otherwise. Note: |
| 272 | * RNDIS headers involve variable numbers of LE32 values. |
| 273 | */ |
Yoshihiro Shimoda | 05f6b0f | 2016-08-22 17:48:26 +0900 | [diff] [blame] | 274 | if (likely(!dev->no_skb_reserve)) |
| 275 | skb_reserve(skb, NET_IP_ALIGN); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 276 | |
| 277 | req->buf = skb->data; |
| 278 | req->length = size; |
| 279 | req->complete = rx_complete; |
| 280 | req->context = skb; |
| 281 | |
| 282 | retval = usb_ep_queue(out, req, gfp_flags); |
| 283 | if (retval == -ENOMEM) |
| 284 | enomem: |
| 285 | defer_kevent(dev, WORK_RX_MEMORY); |
| 286 | if (retval) { |
| 287 | DBG(dev, "rx submit --> %d\n", retval); |
| 288 | if (skb) |
| 289 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 290 | } |
| 291 | return retval; |
| 292 | } |
| 293 | |
| 294 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) |
| 295 | { |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 296 | struct sk_buff *skb = req->context; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 297 | struct eth_dev *dev = ep->driver_data; |
| 298 | int status = req->status; |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 299 | bool queue = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 300 | |
| 301 | switch (status) { |
| 302 | |
| 303 | /* normal completion */ |
| 304 | case 0: |
| 305 | skb_put(skb, req->actual); |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 306 | |
| 307 | if (dev->unwrap) { |
| 308 | unsigned long flags; |
| 309 | |
| 310 | spin_lock_irqsave(&dev->lock, flags); |
| 311 | if (dev->port_usb) { |
| 312 | status = dev->unwrap(dev->port_usb, |
| 313 | skb, |
| 314 | &dev->rx_frames); |
Badhri Jagan Sridharan | 8424b3e | 2014-09-18 10:48:48 -0700 | [diff] [blame] | 315 | if (status == -EINVAL) |
| 316 | dev->net->stats.rx_errors++; |
| 317 | else if (status == -EOVERFLOW) |
| 318 | dev->net->stats.rx_over_errors++; |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 319 | } else { |
| 320 | dev_kfree_skb_any(skb); |
| 321 | status = -ENOTCONN; |
| 322 | } |
| 323 | spin_unlock_irqrestore(&dev->lock, flags); |
| 324 | } else { |
| 325 | skb_queue_tail(&dev->rx_frames, skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 326 | } |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 327 | if (!status) |
| 328 | queue = 1; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 329 | break; |
| 330 | |
| 331 | /* software-driven interface shutdown */ |
| 332 | case -ECONNRESET: /* unlink */ |
| 333 | case -ESHUTDOWN: /* disconnect etc */ |
| 334 | VDBG(dev, "rx shutdown, code %d\n", status); |
| 335 | goto quiesce; |
| 336 | |
| 337 | /* for hardware automagic (such as pxa) */ |
| 338 | case -ECONNABORTED: /* endpoint reset */ |
| 339 | DBG(dev, "rx %s reset\n", ep->name); |
| 340 | defer_kevent(dev, WORK_RX_MEMORY); |
| 341 | quiesce: |
| 342 | dev_kfree_skb_any(skb); |
| 343 | goto clean; |
| 344 | |
| 345 | /* data overrun */ |
| 346 | case -EOVERFLOW: |
| 347 | dev->net->stats.rx_over_errors++; |
| 348 | /* FALLTHROUGH */ |
| 349 | |
| 350 | default: |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 351 | queue = 1; |
| 352 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 353 | dev->net->stats.rx_errors++; |
| 354 | DBG(dev, "rx status %d\n", status); |
| 355 | break; |
| 356 | } |
| 357 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 358 | clean: |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 359 | spin_lock(&dev->req_lock); |
| 360 | list_add(&req->list, &dev->rx_reqs); |
| 361 | spin_unlock(&dev->req_lock); |
| 362 | |
| 363 | if (queue) |
| 364 | queue_work(uether_wq, &dev->rx_work); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n) |
| 368 | { |
| 369 | unsigned i; |
| 370 | struct usb_request *req; |
| 371 | |
| 372 | if (!n) |
| 373 | return -ENOMEM; |
| 374 | |
| 375 | /* queue/recycle up to N requests */ |
| 376 | i = n; |
| 377 | list_for_each_entry(req, list, list) { |
| 378 | if (i-- == 0) |
| 379 | goto extra; |
| 380 | } |
| 381 | while (i--) { |
| 382 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); |
| 383 | if (!req) |
| 384 | return list_empty(list) ? -ENOMEM : 0; |
| 385 | list_add(&req->list, list); |
| 386 | } |
| 387 | return 0; |
| 388 | |
| 389 | extra: |
| 390 | /* free extras */ |
| 391 | for (;;) { |
| 392 | struct list_head *next; |
| 393 | |
| 394 | next = req->list.next; |
| 395 | list_del(&req->list); |
| 396 | usb_ep_free_request(ep, req); |
| 397 | |
| 398 | if (next == list) |
| 399 | break; |
| 400 | |
| 401 | req = container_of(next, struct usb_request, list); |
| 402 | } |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n) |
| 407 | { |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 408 | int status = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 409 | |
| 410 | spin_lock(&dev->req_lock); |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 411 | if (link->in_ep) { |
| 412 | status = prealloc(&dev->tx_reqs, link->in_ep, n); |
| 413 | if (status < 0) |
| 414 | goto fail; |
| 415 | } |
| 416 | |
| 417 | if (link->out_ep) { |
| 418 | status = prealloc(&dev->rx_reqs, link->out_ep, n); |
| 419 | if (status < 0) |
| 420 | goto fail; |
| 421 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 422 | goto done; |
| 423 | fail: |
| 424 | DBG(dev, "can't alloc requests\n"); |
| 425 | done: |
| 426 | spin_unlock(&dev->req_lock); |
| 427 | return status; |
| 428 | } |
| 429 | |
| 430 | static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags) |
| 431 | { |
| 432 | struct usb_request *req; |
| 433 | unsigned long flags; |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 434 | int req_cnt = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 435 | |
| 436 | /* fill unused rxq slots with some skb */ |
| 437 | spin_lock_irqsave(&dev->req_lock, flags); |
| 438 | while (!list_empty(&dev->rx_reqs)) { |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 439 | /* break the nexus of continuous completion and re-submission*/ |
Praneeth Bajjuri | 6b4b51c | 2015-01-22 16:38:56 -0600 | [diff] [blame] | 440 | if (++req_cnt > qlen(dev->gadget, dev->qmult)) |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 441 | break; |
| 442 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 443 | req = container_of(dev->rx_reqs.next, |
| 444 | struct usb_request, list); |
| 445 | list_del_init(&req->list); |
| 446 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 447 | |
| 448 | if (rx_submit(dev, req, gfp_flags) < 0) { |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 449 | spin_lock_irqsave(&dev->req_lock, flags); |
| 450 | list_add(&req->list, &dev->rx_reqs); |
| 451 | spin_unlock_irqrestore(&dev->req_lock, flags); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 452 | defer_kevent(dev, WORK_RX_MEMORY); |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | spin_lock_irqsave(&dev->req_lock, flags); |
| 457 | } |
| 458 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 459 | } |
| 460 | |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 461 | static void process_rx_w(struct work_struct *work) |
| 462 | { |
| 463 | struct eth_dev *dev = container_of(work, struct eth_dev, rx_work); |
| 464 | struct sk_buff *skb; |
| 465 | int status = 0; |
| 466 | |
| 467 | if (!dev->port_usb) |
| 468 | return; |
| 469 | |
| 470 | while ((skb = skb_dequeue(&dev->rx_frames))) { |
| 471 | if (status < 0 |
| 472 | || ETH_HLEN > skb->len |
| 473 | || skb->len > ETH_FRAME_LEN) { |
| 474 | dev->net->stats.rx_errors++; |
| 475 | dev->net->stats.rx_length_errors++; |
| 476 | DBG(dev, "rx length %d\n", skb->len); |
| 477 | dev_kfree_skb_any(skb); |
| 478 | continue; |
| 479 | } |
| 480 | skb->protocol = eth_type_trans(skb, dev->net); |
| 481 | dev->net->stats.rx_packets++; |
| 482 | dev->net->stats.rx_bytes += skb->len; |
| 483 | |
| 484 | status = netif_rx_ni(skb); |
| 485 | } |
| 486 | |
| 487 | if (netif_running(dev->net)) |
| 488 | rx_fill(dev, GFP_KERNEL); |
| 489 | } |
| 490 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 491 | static void eth_work(struct work_struct *work) |
| 492 | { |
| 493 | struct eth_dev *dev = container_of(work, struct eth_dev, work); |
| 494 | |
| 495 | if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) { |
| 496 | if (netif_running(dev->net)) |
| 497 | rx_fill(dev, GFP_KERNEL); |
| 498 | } |
| 499 | |
| 500 | if (dev->todo) |
| 501 | DBG(dev, "work done, flags = 0x%lx\n", dev->todo); |
| 502 | } |
| 503 | |
| 504 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) |
| 505 | { |
| 506 | struct sk_buff *skb = req->context; |
| 507 | struct eth_dev *dev = ep->driver_data; |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 508 | struct net_device *net = dev->net; |
| 509 | struct usb_request *new_req; |
| 510 | struct usb_ep *in; |
| 511 | int length; |
| 512 | int retval; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 513 | |
| 514 | switch (req->status) { |
| 515 | default: |
| 516 | dev->net->stats.tx_errors++; |
| 517 | VDBG(dev, "tx err %d\n", req->status); |
| 518 | /* FALLTHROUGH */ |
| 519 | case -ECONNRESET: /* unlink */ |
| 520 | case -ESHUTDOWN: /* disconnect etc */ |
| 521 | break; |
| 522 | case 0: |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 523 | if (!req->zero) |
| 524 | dev->net->stats.tx_bytes += req->length-1; |
| 525 | else |
| 526 | dev->net->stats.tx_bytes += req->length; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 527 | } |
| 528 | dev->net->stats.tx_packets++; |
| 529 | |
| 530 | spin_lock(&dev->req_lock); |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 531 | list_add_tail(&req->list, &dev->tx_reqs); |
| 532 | |
| 533 | if (dev->port_usb->multi_pkt_xfer) { |
| 534 | dev->no_tx_req_used--; |
| 535 | req->length = 0; |
| 536 | in = dev->port_usb->in_ep; |
| 537 | |
| 538 | if (!list_empty(&dev->tx_reqs)) { |
| 539 | new_req = container_of(dev->tx_reqs.next, |
| 540 | struct usb_request, list); |
| 541 | list_del(&new_req->list); |
| 542 | spin_unlock(&dev->req_lock); |
| 543 | if (new_req->length > 0) { |
| 544 | length = new_req->length; |
| 545 | |
| 546 | /* NCM requires no zlp if transfer is |
| 547 | * dwNtbInMaxSize */ |
| 548 | if (dev->port_usb->is_fixed && |
| 549 | length == dev->port_usb->fixed_in_len && |
| 550 | (length % in->maxpacket) == 0) |
| 551 | new_req->zero = 0; |
| 552 | else |
| 553 | new_req->zero = 1; |
| 554 | |
| 555 | /* use zlp framing on tx for strict CDC-Ether |
| 556 | * conformance, though any robust network rx |
| 557 | * path ignores extra padding. and some hardware |
| 558 | * doesn't like to write zlps. |
| 559 | */ |
| 560 | if (new_req->zero && !dev->zlp && |
| 561 | (length % in->maxpacket) == 0) { |
| 562 | new_req->zero = 0; |
| 563 | length++; |
| 564 | } |
| 565 | |
| 566 | new_req->length = length; |
| 567 | retval = usb_ep_queue(in, new_req, GFP_ATOMIC); |
| 568 | switch (retval) { |
| 569 | default: |
| 570 | DBG(dev, "tx queue err %d\n", retval); |
| 571 | break; |
| 572 | case 0: |
| 573 | spin_lock(&dev->req_lock); |
| 574 | dev->no_tx_req_used++; |
| 575 | spin_unlock(&dev->req_lock); |
Amit Pundir | 0917208 | 2016-05-30 15:19:21 +0530 | [diff] [blame] | 576 | netif_trans_update(net); |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 577 | } |
| 578 | } else { |
| 579 | spin_lock(&dev->req_lock); |
| 580 | list_add(&new_req->list, &dev->tx_reqs); |
| 581 | spin_unlock(&dev->req_lock); |
| 582 | } |
| 583 | } else { |
| 584 | spin_unlock(&dev->req_lock); |
| 585 | } |
| 586 | } else { |
| 587 | spin_unlock(&dev->req_lock); |
| 588 | dev_kfree_skb_any(skb); |
| 589 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 590 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 591 | if (netif_carrier_ok(dev->net)) |
| 592 | netif_wake_queue(dev->net); |
| 593 | } |
| 594 | |
| 595 | static inline int is_promisc(u16 cdc_filter) |
| 596 | { |
| 597 | return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS; |
| 598 | } |
| 599 | |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 600 | static void alloc_tx_buffer(struct eth_dev *dev) |
| 601 | { |
| 602 | struct list_head *act; |
| 603 | struct usb_request *req; |
| 604 | |
xerox_lin | cdffcb8 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 605 | dev->tx_req_bufsize = (dev->dl_max_pkts_per_xfer * |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 606 | (dev->net->mtu |
| 607 | + sizeof(struct ethhdr) |
| 608 | /* size of rndis_packet_msg_type */ |
| 609 | + 44 |
| 610 | + 22)); |
| 611 | |
| 612 | list_for_each(act, &dev->tx_reqs) { |
| 613 | req = container_of(act, struct usb_request, list); |
| 614 | if (!req->buf) |
| 615 | req->buf = kmalloc(dev->tx_req_bufsize, |
| 616 | GFP_ATOMIC); |
| 617 | } |
| 618 | } |
| 619 | |
Stephen Hemminger | 25a79c4 | 2009-08-31 19:50:45 +0000 | [diff] [blame] | 620 | static netdev_tx_t eth_start_xmit(struct sk_buff *skb, |
| 621 | struct net_device *net) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 622 | { |
| 623 | struct eth_dev *dev = netdev_priv(net); |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 624 | int length = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 625 | int retval; |
| 626 | struct usb_request *req = NULL; |
| 627 | unsigned long flags; |
| 628 | struct usb_ep *in; |
| 629 | u16 cdc_filter; |
| 630 | |
| 631 | spin_lock_irqsave(&dev->lock, flags); |
| 632 | if (dev->port_usb) { |
| 633 | in = dev->port_usb->in_ep; |
| 634 | cdc_filter = dev->port_usb->cdc_filter; |
| 635 | } else { |
| 636 | in = NULL; |
| 637 | cdc_filter = 0; |
| 638 | } |
| 639 | spin_unlock_irqrestore(&dev->lock, flags); |
| 640 | |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 641 | if (skb && !in) { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 642 | dev_kfree_skb_any(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 643 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 646 | /* Allocate memory for tx_reqs to support multi packet transfer */ |
| 647 | if (dev->port_usb->multi_pkt_xfer && !dev->tx_req_bufsize) |
| 648 | alloc_tx_buffer(dev); |
| 649 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 650 | /* apply outgoing CDC or RNDIS filters */ |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 651 | if (skb && !is_promisc(cdc_filter)) { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 652 | u8 *dest = skb->data; |
| 653 | |
| 654 | if (is_multicast_ether_addr(dest)) { |
| 655 | u16 type; |
| 656 | |
| 657 | /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host |
| 658 | * SET_ETHERNET_MULTICAST_FILTERS requests |
| 659 | */ |
| 660 | if (is_broadcast_ether_addr(dest)) |
| 661 | type = USB_CDC_PACKET_TYPE_BROADCAST; |
| 662 | else |
| 663 | type = USB_CDC_PACKET_TYPE_ALL_MULTICAST; |
| 664 | if (!(cdc_filter & type)) { |
| 665 | dev_kfree_skb_any(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 666 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 667 | } |
| 668 | } |
| 669 | /* ignores USB_CDC_PACKET_TYPE_DIRECTED */ |
| 670 | } |
| 671 | |
| 672 | spin_lock_irqsave(&dev->req_lock, flags); |
| 673 | /* |
| 674 | * this freelist can be empty if an interrupt triggered disconnect() |
| 675 | * and reconfigured the gadget (shutting down this queue) after the |
| 676 | * network stack decided to xmit but before we got the spinlock. |
| 677 | */ |
| 678 | if (list_empty(&dev->tx_reqs)) { |
| 679 | spin_unlock_irqrestore(&dev->req_lock, flags); |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 680 | return NETDEV_TX_BUSY; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | req = container_of(dev->tx_reqs.next, struct usb_request, list); |
| 684 | list_del(&req->list); |
| 685 | |
| 686 | /* temporarily stop TX queue when the freelist empties */ |
| 687 | if (list_empty(&dev->tx_reqs)) |
| 688 | netif_stop_queue(net); |
| 689 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 690 | |
| 691 | /* no buffer copies needed, unless the network stack did it |
| 692 | * or the hardware can't use skb buffers. |
| 693 | * or there's not enough space for extra headers we need |
| 694 | */ |
| 695 | if (dev->wrap) { |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 696 | unsigned long flags; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 697 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 698 | spin_lock_irqsave(&dev->lock, flags); |
| 699 | if (dev->port_usb) |
| 700 | skb = dev->wrap(dev->port_usb, skb); |
Greg Kroah-Hartman | 3a383cc | 2016-09-19 11:05:43 +0200 | [diff] [blame] | 701 | spin_unlock_irqrestore(&dev->lock, flags); |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 702 | if (!skb) { |
| 703 | /* Multi frame CDC protocols may store the frame for |
| 704 | * later which is not a dropped frame. |
| 705 | */ |
Peter Chen | 88c09ea | 2016-07-01 15:33:29 +0800 | [diff] [blame] | 706 | if (dev->port_usb && |
Greg Kroah-Hartman | 3a383cc | 2016-09-19 11:05:43 +0200 | [diff] [blame] | 707 | dev->port_usb->supports_multi_frame) |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 708 | goto multiframe; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 709 | goto drop; |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 710 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 711 | } |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 712 | |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 713 | spin_lock_irqsave(&dev->req_lock, flags); |
| 714 | dev->tx_skb_hold_count++; |
| 715 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 716 | |
| 717 | if (dev->port_usb->multi_pkt_xfer) { |
| 718 | memcpy(req->buf + req->length, skb->data, skb->len); |
| 719 | req->length = req->length + skb->len; |
| 720 | length = req->length; |
| 721 | dev_kfree_skb_any(skb); |
| 722 | |
| 723 | spin_lock_irqsave(&dev->req_lock, flags); |
xerox_lin | cdffcb8 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 724 | if (dev->tx_skb_hold_count < dev->dl_max_pkts_per_xfer) { |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 725 | if (dev->no_tx_req_used > TX_REQ_THRESHOLD) { |
| 726 | list_add(&req->list, &dev->tx_reqs); |
| 727 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 728 | goto success; |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | dev->no_tx_req_used++; |
| 733 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 734 | |
| 735 | spin_lock_irqsave(&dev->lock, flags); |
| 736 | dev->tx_skb_hold_count = 0; |
| 737 | spin_unlock_irqrestore(&dev->lock, flags); |
| 738 | } else { |
| 739 | length = skb->len; |
| 740 | req->buf = skb->data; |
| 741 | req->context = skb; |
| 742 | } |
| 743 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 744 | req->complete = tx_complete; |
| 745 | |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 746 | /* NCM requires no zlp if transfer is dwNtbInMaxSize */ |
Harish Jenny K N | 79775f4 | 2016-09-09 11:30:41 +0200 | [diff] [blame] | 747 | if (dev->port_usb && |
| 748 | dev->port_usb->is_fixed && |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 749 | length == dev->port_usb->fixed_in_len && |
| 750 | (length % in->maxpacket) == 0) |
| 751 | req->zero = 0; |
| 752 | else |
| 753 | req->zero = 1; |
| 754 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 755 | /* use zlp framing on tx for strict CDC-Ether conformance, |
| 756 | * though any robust network rx path ignores extra padding. |
| 757 | * and some hardware doesn't like to write zlps. |
| 758 | */ |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 759 | if (req->zero && !dev->zlp && (length % in->maxpacket) == 0) { |
| 760 | req->zero = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 761 | length++; |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 762 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 763 | |
| 764 | req->length = length; |
| 765 | |
Badhri Jagan Sridharan | cb6a786 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 766 | /* throttle highspeed IRQ rate back slightly */ |
| 767 | if (gadget_is_dualspeed(dev->gadget) && |
| 768 | (dev->gadget->speed == USB_SPEED_HIGH)) { |
| 769 | dev->tx_qlen++; |
Praneeth Bajjuri | 6b4b51c | 2015-01-22 16:38:56 -0600 | [diff] [blame] | 770 | if (dev->tx_qlen == (dev->qmult/2)) { |
Badhri Jagan Sridharan | cb6a786 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 771 | req->no_interrupt = 0; |
| 772 | dev->tx_qlen = 0; |
| 773 | } else { |
| 774 | req->no_interrupt = 1; |
| 775 | } |
| 776 | } else { |
| 777 | req->no_interrupt = 0; |
| 778 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 779 | |
| 780 | retval = usb_ep_queue(in, req, GFP_ATOMIC); |
| 781 | switch (retval) { |
| 782 | default: |
| 783 | DBG(dev, "tx queue err %d\n", retval); |
| 784 | break; |
| 785 | case 0: |
Florian Westphal | 860e953 | 2016-05-03 16:33:13 +0200 | [diff] [blame] | 786 | netif_trans_update(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 787 | } |
| 788 | |
| 789 | if (retval) { |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 790 | if (!dev->port_usb->multi_pkt_xfer) |
| 791 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 792 | drop: |
| 793 | dev->net->stats.tx_dropped++; |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 794 | multiframe: |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 795 | spin_lock_irqsave(&dev->req_lock, flags); |
| 796 | if (list_empty(&dev->tx_reqs)) |
| 797 | netif_start_queue(net); |
| 798 | list_add(&req->list, &dev->tx_reqs); |
| 799 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 800 | } |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 801 | success: |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 802 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | /*-------------------------------------------------------------------------*/ |
| 806 | |
| 807 | static void eth_start(struct eth_dev *dev, gfp_t gfp_flags) |
| 808 | { |
| 809 | DBG(dev, "%s\n", __func__); |
| 810 | |
| 811 | /* fill the rx queue */ |
| 812 | rx_fill(dev, gfp_flags); |
| 813 | |
| 814 | /* and open the tx floodgates */ |
Badhri Jagan Sridharan | cb6a786 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 815 | dev->tx_qlen = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 816 | netif_wake_queue(dev->net); |
| 817 | } |
| 818 | |
| 819 | static int eth_open(struct net_device *net) |
| 820 | { |
| 821 | struct eth_dev *dev = netdev_priv(net); |
| 822 | struct gether *link; |
| 823 | |
| 824 | DBG(dev, "%s\n", __func__); |
| 825 | if (netif_carrier_ok(dev->net)) |
| 826 | eth_start(dev, GFP_KERNEL); |
| 827 | |
| 828 | spin_lock_irq(&dev->lock); |
| 829 | link = dev->port_usb; |
| 830 | if (link && link->open) |
| 831 | link->open(link); |
| 832 | spin_unlock_irq(&dev->lock); |
| 833 | |
| 834 | return 0; |
| 835 | } |
| 836 | |
| 837 | static int eth_stop(struct net_device *net) |
| 838 | { |
| 839 | struct eth_dev *dev = netdev_priv(net); |
| 840 | unsigned long flags; |
| 841 | |
| 842 | VDBG(dev, "%s\n", __func__); |
| 843 | netif_stop_queue(net); |
| 844 | |
| 845 | DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", |
| 846 | dev->net->stats.rx_packets, dev->net->stats.tx_packets, |
| 847 | dev->net->stats.rx_errors, dev->net->stats.tx_errors |
| 848 | ); |
| 849 | |
| 850 | /* ensure there are no more active requests */ |
| 851 | spin_lock_irqsave(&dev->lock, flags); |
| 852 | if (dev->port_usb) { |
| 853 | struct gether *link = dev->port_usb; |
Michael Grzeschik | b1b552a | 2012-08-08 11:48:10 +0200 | [diff] [blame] | 854 | const struct usb_endpoint_descriptor *in; |
| 855 | const struct usb_endpoint_descriptor *out; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 856 | |
| 857 | if (link->close) |
| 858 | link->close(link); |
| 859 | |
| 860 | /* NOTE: we have no abort-queue primitive we could use |
| 861 | * to cancel all pending I/O. Instead, we disable then |
| 862 | * reenable the endpoints ... this idiom may leave toggle |
| 863 | * wrong, but that's a self-correcting error. |
| 864 | * |
| 865 | * REVISIT: we *COULD* just let the transfers complete at |
| 866 | * their own pace; the network stack can handle old packets. |
| 867 | * For the moment we leave this here, since it works. |
| 868 | */ |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 869 | if (link->in_ep) { |
| 870 | in = link->in_ep->desc; |
| 871 | usb_ep_disable(link->in_ep); |
| 872 | if (netif_carrier_ok(net)) { |
| 873 | DBG(dev, "host still using in endpoints\n"); |
| 874 | link->in_ep->desc = in; |
| 875 | usb_ep_enable(link->in_ep); |
| 876 | } |
| 877 | } |
| 878 | |
| 879 | if (link->out_ep) { |
| 880 | out = link->out_ep->desc; |
| 881 | usb_ep_disable(link->out_ep); |
| 882 | if (netif_carrier_ok(net)) { |
| 883 | DBG(dev, "host still using out endpoints\n"); |
| 884 | link->out_ep->desc = out; |
| 885 | usb_ep_enable(link->out_ep); |
| 886 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 887 | } |
| 888 | } |
| 889 | spin_unlock_irqrestore(&dev->lock, flags); |
| 890 | |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | /*-------------------------------------------------------------------------*/ |
| 895 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 896 | static int get_ether_addr(const char *str, u8 *dev_addr) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 897 | { |
| 898 | if (str) { |
| 899 | unsigned i; |
| 900 | |
| 901 | for (i = 0; i < 6; i++) { |
| 902 | unsigned char num; |
| 903 | |
| 904 | if ((*str == '.') || (*str == ':')) |
| 905 | str++; |
Andy Shevchenko | e644814 | 2010-06-15 17:04:44 +0300 | [diff] [blame] | 906 | num = hex_to_bin(*str++) << 4; |
| 907 | num |= hex_to_bin(*str++); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 908 | dev_addr [i] = num; |
| 909 | } |
| 910 | if (is_valid_ether_addr(dev_addr)) |
| 911 | return 0; |
| 912 | } |
Joe Perches | 006c913 | 2012-07-12 22:33:11 -0700 | [diff] [blame] | 913 | eth_random_addr(dev_addr); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 914 | return 1; |
| 915 | } |
| 916 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 917 | static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len) |
| 918 | { |
| 919 | if (len < 18) |
| 920 | return -EINVAL; |
| 921 | |
Andy Shevchenko | 27f3870 | 2015-01-15 13:40:04 +0200 | [diff] [blame] | 922 | snprintf(str, len, "%pM", dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 923 | return 18; |
| 924 | } |
| 925 | |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 926 | static int ether_ioctl(struct net_device *, struct ifreq *, int); |
| 927 | |
Stephen Hemminger | 5ec38f3 | 2009-01-07 18:05:39 -0800 | [diff] [blame] | 928 | static const struct net_device_ops eth_netdev_ops = { |
| 929 | .ndo_open = eth_open, |
| 930 | .ndo_stop = eth_stop, |
| 931 | .ndo_start_xmit = eth_start_xmit, |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 932 | .ndo_do_ioctl = ether_ioctl, |
Stephen Hemminger | 5ec38f3 | 2009-01-07 18:05:39 -0800 | [diff] [blame] | 933 | .ndo_change_mtu = ueth_change_mtu, |
| 934 | .ndo_set_mac_address = eth_mac_addr, |
| 935 | .ndo_validate_addr = eth_validate_addr, |
| 936 | }; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 937 | |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 938 | static const struct net_device_ops eth_netdev_ops_ip = { |
| 939 | .ndo_open = eth_open, |
| 940 | .ndo_stop = eth_stop, |
| 941 | .ndo_start_xmit = eth_start_xmit, |
| 942 | .ndo_do_ioctl = ether_ioctl, |
| 943 | .ndo_change_mtu = ueth_change_mtu_ip, |
| 944 | .ndo_set_mac_address = NULL, |
| 945 | .ndo_validate_addr = NULL, |
| 946 | }; |
| 947 | |
| 948 | static int rmnet_ioctl_extended(struct net_device *dev, struct ifreq *ifr) |
| 949 | { |
| 950 | struct rmnet_ioctl_extended_s ext_cmd; |
| 951 | struct eth_dev *eth_dev = netdev_priv(dev); |
| 952 | int rc = 0; |
| 953 | |
| 954 | rc = copy_from_user(&ext_cmd, ifr->ifr_ifru.ifru_data, |
| 955 | sizeof(struct rmnet_ioctl_extended_s)); |
| 956 | |
| 957 | if (rc) { |
| 958 | DBG(eth_dev, "%s(): copy_from_user() failed\n", __func__); |
| 959 | return rc; |
| 960 | } |
| 961 | |
| 962 | switch (ext_cmd.extended_ioctl) { |
| 963 | case RMNET_IOCTL_GET_SUPPORTED_FEATURES: |
| 964 | ext_cmd.u.data = 0; |
| 965 | break; |
| 966 | |
| 967 | case RMNET_IOCTL_SET_MRU: |
| 968 | if (netif_running(dev)) |
| 969 | return -EBUSY; |
| 970 | |
| 971 | /* 16K max */ |
| 972 | if ((size_t)ext_cmd.u.data > 0x4000) |
| 973 | return -EINVAL; |
| 974 | |
| 975 | if (eth_dev->port_usb) { |
| 976 | eth_dev->port_usb->is_fixed = true; |
| 977 | eth_dev->port_usb->fixed_out_len = |
| 978 | (size_t) ext_cmd.u.data; |
| 979 | DBG(eth_dev, "[%s] rmnet_ioctl(): SET MRU to %u\n", |
| 980 | dev->name, eth_dev->port_usb->fixed_out_len); |
| 981 | } else { |
| 982 | pr_err("[%s]: %s: SET MRU failed. Cable disconnected\n", |
| 983 | dev->name, __func__); |
| 984 | return -ENODEV; |
| 985 | } |
| 986 | break; |
| 987 | |
| 988 | case RMNET_IOCTL_GET_MRU: |
| 989 | if (eth_dev->port_usb) { |
| 990 | ext_cmd.u.data = eth_dev->port_usb->is_fixed ? |
| 991 | eth_dev->port_usb->fixed_out_len : |
| 992 | dev->mtu; |
| 993 | } else { |
| 994 | pr_err("[%s]: %s: GET MRU failed. Cable disconnected\n", |
| 995 | dev->name, __func__); |
| 996 | return -ENODEV; |
| 997 | } |
| 998 | break; |
| 999 | |
| 1000 | case RMNET_IOCTL_GET_DRIVER_NAME: |
| 1001 | strlcpy(ext_cmd.u.if_name, dev->name, |
| 1002 | sizeof(ext_cmd.u.if_name)); |
| 1003 | break; |
| 1004 | |
| 1005 | default: |
| 1006 | break; |
| 1007 | } |
| 1008 | |
| 1009 | rc = copy_to_user(ifr->ifr_ifru.ifru_data, &ext_cmd, |
| 1010 | sizeof(struct rmnet_ioctl_extended_s)); |
| 1011 | |
| 1012 | if (rc) |
| 1013 | DBG(eth_dev, "%s(): copy_to_user() failed\n", __func__); |
| 1014 | return rc; |
| 1015 | } |
| 1016 | |
| 1017 | static int ether_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 1018 | { |
| 1019 | struct eth_dev *eth_dev = netdev_priv(dev); |
| 1020 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; |
| 1021 | int prev_mtu = dev->mtu; |
| 1022 | u32 state, old_opmode; |
| 1023 | int rc = -EFAULT; |
| 1024 | |
| 1025 | old_opmode = eth_dev->flags; |
| 1026 | /* Process IOCTL command */ |
| 1027 | switch (cmd) { |
| 1028 | case RMNET_IOCTL_SET_LLP_ETHERNET: /*Set Ethernet protocol*/ |
| 1029 | /* Perform Ethernet config only if in IP mode currently*/ |
| 1030 | if (test_bit(RMNET_MODE_LLP_IP, ð_dev->flags)) { |
| 1031 | ether_setup(dev); |
| 1032 | dev->mtu = prev_mtu; |
| 1033 | dev->netdev_ops = ð_netdev_ops; |
| 1034 | clear_bit(RMNET_MODE_LLP_IP, ð_dev->flags); |
| 1035 | set_bit(RMNET_MODE_LLP_ETH, ð_dev->flags); |
| 1036 | DBG(eth_dev, "[%s] ioctl(): set Ethernet proto mode\n", |
| 1037 | dev->name); |
| 1038 | } |
| 1039 | if (test_bit(RMNET_MODE_LLP_ETH, ð_dev->flags)) |
| 1040 | rc = 0; |
| 1041 | break; |
| 1042 | |
| 1043 | case RMNET_IOCTL_SET_LLP_IP: /* Set RAWIP protocol*/ |
| 1044 | /* Perform IP config only if in Ethernet mode currently*/ |
| 1045 | if (test_bit(RMNET_MODE_LLP_ETH, ð_dev->flags)) { |
| 1046 | /* Undo config done in ether_setup() */ |
| 1047 | dev->header_ops = NULL; /* No header */ |
| 1048 | dev->type = ARPHRD_RAWIP; |
| 1049 | dev->hard_header_len = 0; |
| 1050 | dev->mtu = prev_mtu; |
| 1051 | dev->addr_len = 0; |
| 1052 | dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST); |
| 1053 | dev->netdev_ops = ð_netdev_ops_ip; |
| 1054 | clear_bit(RMNET_MODE_LLP_ETH, ð_dev->flags); |
| 1055 | set_bit(RMNET_MODE_LLP_IP, ð_dev->flags); |
| 1056 | DBG(eth_dev, "[%s] ioctl(): set IP protocol mode\n", |
| 1057 | dev->name); |
| 1058 | } |
| 1059 | if (test_bit(RMNET_MODE_LLP_IP, ð_dev->flags)) |
| 1060 | rc = 0; |
| 1061 | break; |
| 1062 | |
| 1063 | case RMNET_IOCTL_GET_LLP: /* Get link protocol state */ |
| 1064 | state = eth_dev->flags & (RMNET_MODE_LLP_ETH |
| 1065 | | RMNET_MODE_LLP_IP); |
| 1066 | if (copy_to_user(addr, &state, sizeof(state))) |
| 1067 | break; |
| 1068 | rc = 0; |
| 1069 | break; |
| 1070 | |
| 1071 | case RMNET_IOCTL_SET_RX_HEADROOM: /* Set RX headroom */ |
| 1072 | if (copy_from_user(ð_dev->rx_needed_headroom, addr, |
| 1073 | sizeof(eth_dev->rx_needed_headroom))) |
| 1074 | break; |
| 1075 | DBG(eth_dev, "[%s] ioctl(): set RX HEADROOM: %x\n", |
| 1076 | dev->name, eth_dev->rx_needed_headroom); |
| 1077 | rc = 0; |
| 1078 | break; |
| 1079 | |
| 1080 | case RMNET_IOCTL_EXTENDED: |
| 1081 | rc = rmnet_ioctl_extended(dev, ifr); |
| 1082 | break; |
| 1083 | |
| 1084 | default: |
| 1085 | pr_err("[%s] error: ioctl called for unsupported cmd[%d]", |
| 1086 | dev->name, cmd); |
| 1087 | rc = -EINVAL; |
| 1088 | } |
| 1089 | |
| 1090 | DBG(eth_dev, "[%s] %s: cmd=0x%x opmode old=0x%08x new=0x%08lx\n", |
| 1091 | dev->name, __func__, cmd, old_opmode, eth_dev->flags); |
| 1092 | |
| 1093 | return rc; |
| 1094 | } |
| 1095 | |
Marcel Holtmann | aa79074 | 2010-01-15 22:13:58 -0800 | [diff] [blame] | 1096 | static struct device_type gadget_type = { |
| 1097 | .name = "gadget", |
| 1098 | }; |
| 1099 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1100 | /** |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 1101 | * gether_setup_name - initialize one ethernet-over-usb link |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1102 | * @g: gadget to associated with these links |
| 1103 | * @ethaddr: NULL, or a buffer in which the ethernet address of the |
| 1104 | * host side of the link is recorded |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 1105 | * @netname: name for network device (for example, "usb") |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1106 | * Context: may sleep |
| 1107 | * |
| 1108 | * This sets up the single network link that may be exported by a |
| 1109 | * gadget driver using this framework. The link layer addresses are |
| 1110 | * set up using module parameters. |
| 1111 | * |
Dan Carpenter | 574f24f | 2013-11-14 11:42:11 +0300 | [diff] [blame] | 1112 | * Returns an eth_dev pointer on success, or an ERR_PTR on failure. |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1113 | */ |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1114 | struct eth_dev *gether_setup_name(struct usb_gadget *g, |
| 1115 | const char *dev_addr, const char *host_addr, |
| 1116 | u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1117 | { |
| 1118 | struct eth_dev *dev; |
| 1119 | struct net_device *net; |
| 1120 | int status; |
| 1121 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1122 | net = alloc_etherdev(sizeof *dev); |
| 1123 | if (!net) |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1124 | return ERR_PTR(-ENOMEM); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1125 | |
| 1126 | dev = netdev_priv(net); |
| 1127 | spin_lock_init(&dev->lock); |
| 1128 | spin_lock_init(&dev->req_lock); |
| 1129 | INIT_WORK(&dev->work, eth_work); |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1130 | INIT_WORK(&dev->rx_work, process_rx_w); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1131 | INIT_LIST_HEAD(&dev->tx_reqs); |
| 1132 | INIT_LIST_HEAD(&dev->rx_reqs); |
| 1133 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 1134 | skb_queue_head_init(&dev->rx_frames); |
| 1135 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1136 | /* network device setup */ |
| 1137 | dev->net = net; |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1138 | dev->qmult = qmult; |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 1139 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1140 | |
| 1141 | if (get_ether_addr(dev_addr, net->dev_addr)) |
| 1142 | dev_warn(&g->dev, |
| 1143 | "using random %s ethernet address\n", "self"); |
| 1144 | if (get_ether_addr(host_addr, dev->host_mac)) |
| 1145 | dev_warn(&g->dev, |
| 1146 | "using random %s ethernet address\n", "host"); |
| 1147 | |
| 1148 | if (ethaddr) |
| 1149 | memcpy(ethaddr, dev->host_mac, ETH_ALEN); |
| 1150 | |
Stephen Hemminger | 5ec38f3 | 2009-01-07 18:05:39 -0800 | [diff] [blame] | 1151 | net->netdev_ops = ð_netdev_ops; |
| 1152 | |
Wilfried Klaebe | 7ad24ea | 2014-05-11 00:12:32 +0000 | [diff] [blame] | 1153 | net->ethtool_ops = &ops; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1154 | |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 1155 | /* set operation mode to eth by default */ |
| 1156 | set_bit(RMNET_MODE_LLP_ETH, &dev->flags); |
| 1157 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1158 | dev->gadget = g; |
| 1159 | SET_NETDEV_DEV(net, &g->dev); |
Marcel Holtmann | aa79074 | 2010-01-15 22:13:58 -0800 | [diff] [blame] | 1160 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1161 | |
| 1162 | status = register_netdev(net); |
| 1163 | if (status < 0) { |
| 1164 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); |
| 1165 | free_netdev(net); |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1166 | dev = ERR_PTR(status); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1167 | } else { |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 1168 | INFO(dev, "MAC %pM\n", net->dev_addr); |
| 1169 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1170 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1171 | /* |
| 1172 | * two kinds of host-initiated state changes: |
Kevin Cernekee | 31bde1c | 2012-06-24 21:11:22 -0700 | [diff] [blame] | 1173 | * - iff DATA transfer is active, carrier is "on" |
| 1174 | * - tx queueing enabled if open *and* carrier is "on" |
| 1175 | */ |
| 1176 | netif_carrier_off(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1177 | } |
| 1178 | |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1179 | return dev; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1180 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1181 | EXPORT_SYMBOL_GPL(gether_setup_name); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1182 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1183 | struct net_device *gether_setup_name_default(const char *netname) |
| 1184 | { |
| 1185 | struct net_device *net; |
| 1186 | struct eth_dev *dev; |
| 1187 | |
| 1188 | net = alloc_etherdev(sizeof(*dev)); |
| 1189 | if (!net) |
| 1190 | return ERR_PTR(-ENOMEM); |
| 1191 | |
| 1192 | dev = netdev_priv(net); |
| 1193 | spin_lock_init(&dev->lock); |
| 1194 | spin_lock_init(&dev->req_lock); |
| 1195 | INIT_WORK(&dev->work, eth_work); |
Matthew Moeller | 5df3222 | 2016-03-09 20:19:25 -0600 | [diff] [blame] | 1196 | INIT_WORK(&dev->rx_work, process_rx_w); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1197 | INIT_LIST_HEAD(&dev->tx_reqs); |
| 1198 | INIT_LIST_HEAD(&dev->rx_reqs); |
| 1199 | |
| 1200 | skb_queue_head_init(&dev->rx_frames); |
| 1201 | |
| 1202 | /* network device setup */ |
| 1203 | dev->net = net; |
| 1204 | dev->qmult = QMULT_DEFAULT; |
| 1205 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
| 1206 | |
| 1207 | eth_random_addr(dev->dev_mac); |
| 1208 | pr_warn("using random %s ethernet address\n", "self"); |
| 1209 | eth_random_addr(dev->host_mac); |
| 1210 | pr_warn("using random %s ethernet address\n", "host"); |
| 1211 | |
| 1212 | net->netdev_ops = ð_netdev_ops; |
| 1213 | |
Wilfried Klaebe | 7ad24ea | 2014-05-11 00:12:32 +0000 | [diff] [blame] | 1214 | net->ethtool_ops = &ops; |
Hemant Kumar | fc49dbd | 2018-01-23 12:08:47 -0800 | [diff] [blame^] | 1215 | |
| 1216 | /* set operation mode to eth by default */ |
| 1217 | set_bit(RMNET_MODE_LLP_ETH, &dev->flags); |
| 1218 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1219 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
| 1220 | |
| 1221 | return net; |
| 1222 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1223 | EXPORT_SYMBOL_GPL(gether_setup_name_default); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1224 | |
| 1225 | int gether_register_netdev(struct net_device *net) |
| 1226 | { |
| 1227 | struct eth_dev *dev; |
| 1228 | struct usb_gadget *g; |
| 1229 | struct sockaddr sa; |
| 1230 | int status; |
| 1231 | |
| 1232 | if (!net->dev.parent) |
| 1233 | return -EINVAL; |
| 1234 | dev = netdev_priv(net); |
| 1235 | g = dev->gadget; |
| 1236 | status = register_netdev(net); |
| 1237 | if (status < 0) { |
| 1238 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); |
| 1239 | return status; |
| 1240 | } else { |
| 1241 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); |
| 1242 | |
| 1243 | /* two kinds of host-initiated state changes: |
| 1244 | * - iff DATA transfer is active, carrier is "on" |
| 1245 | * - tx queueing enabled if open *and* carrier is "on" |
| 1246 | */ |
| 1247 | netif_carrier_off(net); |
| 1248 | } |
| 1249 | sa.sa_family = net->type; |
| 1250 | memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN); |
| 1251 | rtnl_lock(); |
| 1252 | status = dev_set_mac_address(net, &sa); |
| 1253 | rtnl_unlock(); |
| 1254 | if (status) |
| 1255 | pr_warn("cannot set self ethernet address: %d\n", status); |
| 1256 | else |
| 1257 | INFO(dev, "MAC %pM\n", dev->dev_mac); |
| 1258 | |
| 1259 | return status; |
| 1260 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1261 | EXPORT_SYMBOL_GPL(gether_register_netdev); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1262 | |
| 1263 | void gether_set_gadget(struct net_device *net, struct usb_gadget *g) |
| 1264 | { |
| 1265 | struct eth_dev *dev; |
| 1266 | |
| 1267 | dev = netdev_priv(net); |
| 1268 | dev->gadget = g; |
| 1269 | SET_NETDEV_DEV(net, &g->dev); |
| 1270 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1271 | EXPORT_SYMBOL_GPL(gether_set_gadget); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1272 | |
| 1273 | int gether_set_dev_addr(struct net_device *net, const char *dev_addr) |
| 1274 | { |
| 1275 | struct eth_dev *dev; |
| 1276 | u8 new_addr[ETH_ALEN]; |
| 1277 | |
| 1278 | dev = netdev_priv(net); |
| 1279 | if (get_ether_addr(dev_addr, new_addr)) |
| 1280 | return -EINVAL; |
| 1281 | memcpy(dev->dev_mac, new_addr, ETH_ALEN); |
| 1282 | return 0; |
| 1283 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1284 | EXPORT_SYMBOL_GPL(gether_set_dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1285 | |
| 1286 | int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len) |
| 1287 | { |
| 1288 | struct eth_dev *dev; |
| 1289 | |
| 1290 | dev = netdev_priv(net); |
| 1291 | return get_ether_addr_str(dev->dev_mac, dev_addr, len); |
| 1292 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1293 | EXPORT_SYMBOL_GPL(gether_get_dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1294 | |
| 1295 | int gether_set_host_addr(struct net_device *net, const char *host_addr) |
| 1296 | { |
| 1297 | struct eth_dev *dev; |
| 1298 | u8 new_addr[ETH_ALEN]; |
| 1299 | |
| 1300 | dev = netdev_priv(net); |
| 1301 | if (get_ether_addr(host_addr, new_addr)) |
| 1302 | return -EINVAL; |
| 1303 | memcpy(dev->host_mac, new_addr, ETH_ALEN); |
| 1304 | return 0; |
| 1305 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1306 | EXPORT_SYMBOL_GPL(gether_set_host_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1307 | |
| 1308 | int gether_get_host_addr(struct net_device *net, char *host_addr, int len) |
| 1309 | { |
| 1310 | struct eth_dev *dev; |
| 1311 | |
| 1312 | dev = netdev_priv(net); |
| 1313 | return get_ether_addr_str(dev->host_mac, host_addr, len); |
| 1314 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1315 | EXPORT_SYMBOL_GPL(gether_get_host_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1316 | |
| 1317 | int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len) |
| 1318 | { |
| 1319 | struct eth_dev *dev; |
| 1320 | |
| 1321 | if (len < 13) |
| 1322 | return -EINVAL; |
| 1323 | |
| 1324 | dev = netdev_priv(net); |
| 1325 | snprintf(host_addr, len, "%pm", dev->host_mac); |
| 1326 | |
| 1327 | return strlen(host_addr); |
| 1328 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1329 | EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1330 | |
Andrzej Pietrasiewicz | bf4277c | 2013-05-28 09:15:45 +0200 | [diff] [blame] | 1331 | void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]) |
| 1332 | { |
| 1333 | struct eth_dev *dev; |
| 1334 | |
| 1335 | dev = netdev_priv(net); |
| 1336 | memcpy(host_mac, dev->host_mac, ETH_ALEN); |
| 1337 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1338 | EXPORT_SYMBOL_GPL(gether_get_host_addr_u8); |
Andrzej Pietrasiewicz | bf4277c | 2013-05-28 09:15:45 +0200 | [diff] [blame] | 1339 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1340 | void gether_set_qmult(struct net_device *net, unsigned qmult) |
| 1341 | { |
| 1342 | struct eth_dev *dev; |
| 1343 | |
| 1344 | dev = netdev_priv(net); |
| 1345 | dev->qmult = qmult; |
| 1346 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1347 | EXPORT_SYMBOL_GPL(gether_set_qmult); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1348 | |
| 1349 | unsigned gether_get_qmult(struct net_device *net) |
| 1350 | { |
| 1351 | struct eth_dev *dev; |
| 1352 | |
| 1353 | dev = netdev_priv(net); |
| 1354 | return dev->qmult; |
| 1355 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1356 | EXPORT_SYMBOL_GPL(gether_get_qmult); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1357 | |
| 1358 | int gether_get_ifname(struct net_device *net, char *name, int len) |
| 1359 | { |
| 1360 | rtnl_lock(); |
| 1361 | strlcpy(name, netdev_name(net), len); |
| 1362 | rtnl_unlock(); |
| 1363 | return strlen(name); |
| 1364 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1365 | EXPORT_SYMBOL_GPL(gether_get_ifname); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1366 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1367 | /** |
| 1368 | * gether_cleanup - remove Ethernet-over-USB device |
| 1369 | * Context: may sleep |
| 1370 | * |
| 1371 | * This is called to free all resources allocated by @gether_setup(). |
| 1372 | */ |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1373 | void gether_cleanup(struct eth_dev *dev) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1374 | { |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1375 | if (!dev) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1376 | return; |
| 1377 | |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1378 | unregister_netdev(dev->net); |
| 1379 | flush_work(&dev->work); |
| 1380 | free_netdev(dev->net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1381 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1382 | EXPORT_SYMBOL_GPL(gether_cleanup); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1383 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1384 | /** |
| 1385 | * gether_connect - notify network layer that USB link is active |
| 1386 | * @link: the USB link, set up with endpoints, descriptors matching |
| 1387 | * current device speed, and any framing wrapper(s) set up. |
| 1388 | * Context: irqs blocked |
| 1389 | * |
| 1390 | * This is called to activate endpoints and let the network layer know |
| 1391 | * the connection is active ("carrier detect"). It may cause the I/O |
| 1392 | * queues to open and start letting network packets flow, but will in |
| 1393 | * any case activate the endpoints so that they respond properly to the |
| 1394 | * USB host. |
| 1395 | * |
| 1396 | * Verify net_device pointer returned using IS_ERR(). If it doesn't |
| 1397 | * indicate some error code (negative errno), ep->driver_data values |
| 1398 | * have been overwritten. |
| 1399 | */ |
| 1400 | struct net_device *gether_connect(struct gether *link) |
| 1401 | { |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1402 | struct eth_dev *dev = link->ioport; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1403 | int result = 0; |
| 1404 | |
| 1405 | if (!dev) |
| 1406 | return ERR_PTR(-EINVAL); |
| 1407 | |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1408 | if (link->in_ep) { |
| 1409 | link->in_ep->driver_data = dev; |
| 1410 | result = usb_ep_enable(link->in_ep); |
| 1411 | if (result != 0) { |
| 1412 | DBG(dev, "enable %s --> %d\n", |
| 1413 | link->in_ep->name, result); |
| 1414 | goto fail0; |
| 1415 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1416 | } |
| 1417 | |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1418 | if (link->out_ep) { |
| 1419 | link->out_ep->driver_data = dev; |
| 1420 | result = usb_ep_enable(link->out_ep); |
| 1421 | if (result != 0) { |
| 1422 | DBG(dev, "enable %s --> %d\n", |
| 1423 | link->out_ep->name, result); |
| 1424 | goto fail1; |
| 1425 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
| 1428 | if (result == 0) |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1429 | result = alloc_requests(dev, link, qlen(dev->gadget, |
| 1430 | dev->qmult)); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1431 | |
| 1432 | if (result == 0) { |
| 1433 | dev->zlp = link->is_zlp_ok; |
Yoshihiro Shimoda | 05f6b0f | 2016-08-22 17:48:26 +0900 | [diff] [blame] | 1434 | dev->no_skb_reserve = link->no_skb_reserve; |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1435 | DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult)); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1436 | |
| 1437 | dev->header_len = link->header_len; |
| 1438 | dev->unwrap = link->unwrap; |
| 1439 | dev->wrap = link->wrap; |
xerox_lin | 87bebf8 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 1440 | dev->ul_max_pkts_per_xfer = link->ul_max_pkts_per_xfer; |
xerox_lin | cdffcb8 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 1441 | dev->dl_max_pkts_per_xfer = link->dl_max_pkts_per_xfer; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1442 | |
| 1443 | spin_lock(&dev->lock); |
Badhri Jagan Sridharan | e791ad3 | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 1444 | dev->tx_skb_hold_count = 0; |
| 1445 | dev->no_tx_req_used = 0; |
| 1446 | dev->tx_req_bufsize = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1447 | dev->port_usb = link; |
David Brownell | 29bac7b | 2008-09-06 21:33:49 -0700 | [diff] [blame] | 1448 | if (netif_running(dev->net)) { |
| 1449 | if (link->open) |
| 1450 | link->open(link); |
| 1451 | } else { |
| 1452 | if (link->close) |
| 1453 | link->close(link); |
| 1454 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1455 | spin_unlock(&dev->lock); |
| 1456 | |
| 1457 | netif_carrier_on(dev->net); |
| 1458 | if (netif_running(dev->net)) |
| 1459 | eth_start(dev, GFP_ATOMIC); |
| 1460 | |
| 1461 | /* on error, disable any endpoints */ |
| 1462 | } else { |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1463 | if (link->out_ep) |
| 1464 | (void) usb_ep_disable(link->out_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1465 | fail1: |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1466 | if (link->in_ep) |
| 1467 | (void) usb_ep_disable(link->in_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1468 | } |
| 1469 | fail0: |
| 1470 | /* caller is responsible for cleanup on error */ |
| 1471 | if (result < 0) |
| 1472 | return ERR_PTR(result); |
| 1473 | return dev->net; |
| 1474 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1475 | EXPORT_SYMBOL_GPL(gether_connect); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1476 | |
| 1477 | /** |
| 1478 | * gether_disconnect - notify network layer that USB link is inactive |
| 1479 | * @link: the USB link, on which gether_connect() was called |
| 1480 | * Context: irqs blocked |
| 1481 | * |
| 1482 | * This is called to deactivate endpoints and let the network layer know |
| 1483 | * the connection went inactive ("no carrier"). |
| 1484 | * |
| 1485 | * On return, the state is as if gether_connect() had never been called. |
| 1486 | * The endpoints are inactive, and accordingly without active USB I/O. |
| 1487 | * Pointers to endpoint descriptors and endpoint private data are nulled. |
| 1488 | */ |
| 1489 | void gether_disconnect(struct gether *link) |
| 1490 | { |
| 1491 | struct eth_dev *dev = link->ioport; |
| 1492 | struct usb_request *req; |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1493 | struct sk_buff *skb; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1494 | |
| 1495 | WARN_ON(!dev); |
| 1496 | if (!dev) |
| 1497 | return; |
| 1498 | |
| 1499 | DBG(dev, "%s\n", __func__); |
| 1500 | |
| 1501 | netif_stop_queue(dev->net); |
| 1502 | netif_carrier_off(dev->net); |
| 1503 | |
| 1504 | /* disable endpoints, forcing (synchronous) completion |
| 1505 | * of all pending i/o. then free the request objects |
| 1506 | * and forget about the endpoints. |
| 1507 | */ |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1508 | if (link->in_ep) { |
| 1509 | usb_ep_disable(link->in_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1510 | spin_lock(&dev->req_lock); |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1511 | while (!list_empty(&dev->tx_reqs)) { |
| 1512 | req = container_of(dev->tx_reqs.next, |
| 1513 | struct usb_request, list); |
| 1514 | list_del(&req->list); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1515 | |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1516 | spin_unlock(&dev->req_lock); |
| 1517 | if (link->multi_pkt_xfer) |
| 1518 | kfree(req->buf); |
| 1519 | usb_ep_free_request(link->in_ep, req); |
| 1520 | spin_lock(&dev->req_lock); |
| 1521 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1522 | spin_unlock(&dev->req_lock); |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1523 | link->in_ep->desc = NULL; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1524 | } |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1525 | |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1526 | if (link->out_ep) { |
| 1527 | usb_ep_disable(link->out_ep); |
| 1528 | spin_lock(&dev->req_lock); |
| 1529 | while (!list_empty(&dev->rx_reqs)) { |
| 1530 | req = container_of(dev->rx_reqs.next, |
| 1531 | struct usb_request, list); |
| 1532 | list_del(&req->list); |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1533 | |
Hemant Kumar | 8a7c812 | 2018-01-05 11:47:46 -0800 | [diff] [blame] | 1534 | spin_unlock(&dev->req_lock); |
| 1535 | usb_ep_free_request(link->out_ep, req); |
| 1536 | spin_lock(&dev->req_lock); |
| 1537 | } |
| 1538 | spin_unlock(&dev->req_lock); |
| 1539 | |
| 1540 | spin_lock(&dev->rx_frames.lock); |
| 1541 | while ((skb = __skb_dequeue(&dev->rx_frames))) |
| 1542 | dev_kfree_skb_any(skb); |
| 1543 | spin_unlock(&dev->rx_frames.lock); |
| 1544 | |
| 1545 | link->out_ep->desc = NULL; |
| 1546 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1547 | |
| 1548 | /* finish forgetting about this USB link episode */ |
| 1549 | dev->header_len = 0; |
| 1550 | dev->unwrap = NULL; |
| 1551 | dev->wrap = NULL; |
| 1552 | |
| 1553 | spin_lock(&dev->lock); |
| 1554 | dev->port_usb = NULL; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1555 | spin_unlock(&dev->lock); |
| 1556 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1557 | EXPORT_SYMBOL_GPL(gether_disconnect); |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1558 | |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1559 | static int __init gether_init(void) |
| 1560 | { |
| 1561 | uether_wq = create_singlethread_workqueue("uether"); |
| 1562 | if (!uether_wq) { |
| 1563 | pr_err("%s: Unable to create workqueue: uether\n", __func__); |
| 1564 | return -ENOMEM; |
| 1565 | } |
| 1566 | return 0; |
| 1567 | } |
| 1568 | module_init(gether_init); |
| 1569 | |
| 1570 | static void __exit gether_exit(void) |
| 1571 | { |
| 1572 | destroy_workqueue(uether_wq); |
| 1573 | |
| 1574 | } |
| 1575 | module_exit(gether_exit); |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1576 | MODULE_AUTHOR("David Brownell"); |
Badhri Jagan Sridharan | a096ba5 | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1577 | MODULE_DESCRIPTION("ethernet over USB driver"); |
| 1578 | MODULE_LICENSE("GPL v2"); |