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> |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 24 | |
| 25 | #include "u_ether.h" |
| 26 | |
| 27 | |
| 28 | /* |
| 29 | * This component encapsulates the Ethernet link glue needed to provide |
| 30 | * one (!) network link through the USB gadget stack, normally "usb0". |
| 31 | * |
| 32 | * The control and data models are handled by the function driver which |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 33 | * connects to this code; such as CDC Ethernet (ECM or EEM), |
| 34 | * "CDC Subset", or RNDIS. That includes all descriptor and endpoint |
| 35 | * management. |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 36 | * |
| 37 | * Link level addressing is handled by this component using module |
| 38 | * parameters; if no such parameters are provided, random link level |
| 39 | * addresses are used. Each end of the link uses one address. The |
| 40 | * host end address is exported in various ways, and is often recorded |
| 41 | * in configuration databases. |
| 42 | * |
| 43 | * The driver which assembles each configuration using such a link is |
| 44 | * responsible for ensuring that each configuration includes at most one |
| 45 | * instance of is network link. (The network layer provides ways for |
| 46 | * this single "physical" link to be used by multiple virtual links.) |
| 47 | */ |
| 48 | |
David Brownell | 8a1ce2c | 2008-08-18 17:43:56 -0700 | [diff] [blame] | 49 | #define UETH__VERSION "29-May-2008" |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 50 | |
Mike Looijmans | bba787a | 2015-08-05 08:54:55 +0200 | [diff] [blame] | 51 | /* Experiments show that both Linux and Windows hosts allow up to 16k |
| 52 | * frame sizes. Set the max size to 15k+52 to prevent allocating 32k |
| 53 | * blocks and still have efficient handling. */ |
| 54 | #define GETHER_MAX_ETH_FRAME_LEN 15412 |
| 55 | |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 56 | static struct workqueue_struct *uether_wq; |
| 57 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 58 | struct eth_dev { |
| 59 | /* lock is held while accessing port_usb |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 60 | */ |
| 61 | spinlock_t lock; |
| 62 | struct gether *port_usb; |
| 63 | |
| 64 | struct net_device *net; |
| 65 | struct usb_gadget *gadget; |
| 66 | |
| 67 | spinlock_t req_lock; /* guard {rx,tx}_reqs */ |
| 68 | struct list_head tx_reqs, rx_reqs; |
Badhri Jagan Sridharan | 3c0f288 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 69 | unsigned tx_qlen; |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 70 | /* Minimum number of TX USB request queued to UDC */ |
| 71 | #define TX_REQ_THRESHOLD 5 |
| 72 | int no_tx_req_used; |
| 73 | int tx_skb_hold_count; |
| 74 | u32 tx_req_bufsize; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 75 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 76 | struct sk_buff_head rx_frames; |
| 77 | |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 78 | unsigned qmult; |
| 79 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 80 | unsigned header_len; |
xerox_lin | 72ffa18 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 81 | unsigned ul_max_pkts_per_xfer; |
xerox_lin | f053900 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 82 | unsigned dl_max_pkts_per_xfer; |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 83 | struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb); |
| 84 | int (*unwrap)(struct gether *, |
| 85 | struct sk_buff *skb, |
| 86 | struct sk_buff_head *list); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 87 | |
| 88 | struct work_struct work; |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 89 | struct work_struct rx_work; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 90 | |
| 91 | unsigned long todo; |
| 92 | #define WORK_RX_MEMORY 0 |
| 93 | |
| 94 | bool zlp; |
| 95 | u8 host_mac[ETH_ALEN]; |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 96 | u8 dev_mac[ETH_ALEN]; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 97 | }; |
| 98 | |
| 99 | /*-------------------------------------------------------------------------*/ |
| 100 | |
| 101 | #define RX_EXTRA 20 /* bytes guarding against rx overflows */ |
| 102 | |
| 103 | #define DEFAULT_QLEN 2 /* double buffering by default */ |
| 104 | |
Paul Zimmerman | 04617db | 2011-06-27 14:13:18 -0700 | [diff] [blame] | 105 | /* for dual-speed hardware, use deeper queues at high/super speed */ |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 106 | static inline int qlen(struct usb_gadget *gadget, unsigned qmult) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 107 | { |
Paul Zimmerman | 04617db | 2011-06-27 14:13:18 -0700 | [diff] [blame] | 108 | if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH || |
| 109 | gadget->speed == USB_SPEED_SUPER)) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 110 | return qmult * DEFAULT_QLEN; |
| 111 | else |
| 112 | return DEFAULT_QLEN; |
| 113 | } |
| 114 | |
| 115 | /*-------------------------------------------------------------------------*/ |
| 116 | |
| 117 | /* REVISIT there must be a better way than having two sets |
| 118 | * of debug calls ... |
| 119 | */ |
| 120 | |
| 121 | #undef DBG |
| 122 | #undef VDBG |
| 123 | #undef ERROR |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 124 | #undef INFO |
| 125 | |
| 126 | #define xprintk(d, level, fmt, args...) \ |
| 127 | printk(level "%s: " fmt , (d)->net->name , ## args) |
| 128 | |
| 129 | #ifdef DEBUG |
| 130 | #undef DEBUG |
| 131 | #define DBG(dev, fmt, args...) \ |
| 132 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 133 | #else |
| 134 | #define DBG(dev, fmt, args...) \ |
| 135 | do { } while (0) |
| 136 | #endif /* DEBUG */ |
| 137 | |
| 138 | #ifdef VERBOSE_DEBUG |
| 139 | #define VDBG DBG |
| 140 | #else |
| 141 | #define VDBG(dev, fmt, args...) \ |
| 142 | do { } while (0) |
| 143 | #endif /* DEBUG */ |
| 144 | |
| 145 | #define ERROR(dev, fmt, args...) \ |
| 146 | xprintk(dev , KERN_ERR , fmt , ## args) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 147 | #define INFO(dev, fmt, args...) \ |
| 148 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 149 | |
| 150 | /*-------------------------------------------------------------------------*/ |
| 151 | |
| 152 | /* NETWORK DRIVER HOOKUP (to the layer above this driver) */ |
| 153 | |
Stephen Hemminger | ccad637 | 2008-11-19 22:42:31 -0800 | [diff] [blame] | 154 | static int ueth_change_mtu(struct net_device *net, int new_mtu) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 155 | { |
Mike Looijmans | ab738ff | 2015-11-30 12:18:23 +0100 | [diff] [blame] | 156 | if (new_mtu <= ETH_HLEN || new_mtu > GETHER_MAX_ETH_FRAME_LEN) |
| 157 | return -ERANGE; |
| 158 | net->mtu = new_mtu; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 159 | |
Mike Looijmans | ab738ff | 2015-11-30 12:18:23 +0100 | [diff] [blame] | 160 | return 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p) |
| 164 | { |
Jiri Pirko | 7826d43 | 2013-01-06 00:44:26 +0000 | [diff] [blame] | 165 | struct eth_dev *dev = netdev_priv(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 166 | |
Jiri Pirko | 7826d43 | 2013-01-06 00:44:26 +0000 | [diff] [blame] | 167 | strlcpy(p->driver, "g_ether", sizeof(p->driver)); |
| 168 | strlcpy(p->version, UETH__VERSION, sizeof(p->version)); |
| 169 | strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version)); |
| 170 | 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] | 171 | } |
| 172 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 173 | /* REVISIT can also support: |
| 174 | * - WOL (by tracking suspends and issuing remote wakeup) |
| 175 | * - msglevel (implies updated messaging) |
| 176 | * - ... probably more ethtool ops |
| 177 | */ |
| 178 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 179 | static const struct ethtool_ops ops = { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 180 | .get_drvinfo = eth_get_drvinfo, |
Jonathan McDowell | 237e75b | 2009-03-26 00:45:27 -0700 | [diff] [blame] | 181 | .get_link = ethtool_op_get_link, |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 182 | }; |
| 183 | |
| 184 | static void defer_kevent(struct eth_dev *dev, int flag) |
| 185 | { |
| 186 | if (test_and_set_bit(flag, &dev->todo)) |
| 187 | return; |
| 188 | if (!schedule_work(&dev->work)) |
| 189 | ERROR(dev, "kevent %d may have been dropped\n", flag); |
| 190 | else |
| 191 | DBG(dev, "kevent %d scheduled\n", flag); |
| 192 | } |
| 193 | |
| 194 | static void rx_complete(struct usb_ep *ep, struct usb_request *req); |
| 195 | |
| 196 | static int |
| 197 | rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) |
| 198 | { |
| 199 | struct sk_buff *skb; |
| 200 | int retval = -ENOMEM; |
| 201 | size_t size = 0; |
| 202 | struct usb_ep *out; |
| 203 | unsigned long flags; |
| 204 | |
| 205 | spin_lock_irqsave(&dev->lock, flags); |
| 206 | if (dev->port_usb) |
| 207 | out = dev->port_usb->out_ep; |
| 208 | else |
| 209 | out = NULL; |
| 210 | spin_unlock_irqrestore(&dev->lock, flags); |
| 211 | |
| 212 | if (!out) |
| 213 | return -ENOTCONN; |
| 214 | |
| 215 | |
| 216 | /* Padding up to RX_EXTRA handles minor disagreements with host. |
| 217 | * Normally we use the USB "terminate on short read" convention; |
| 218 | * so allow up to (N*maxpacket), since that memory is normally |
| 219 | * already allocated. Some hardware doesn't deal well with short |
| 220 | * reads (e.g. DMA must be N*maxpacket), so for now don't trim a |
| 221 | * byte off the end (to force hardware errors on overflow). |
| 222 | * |
| 223 | * RNDIS uses internal framing, and explicitly allows senders to |
| 224 | * pad to end-of-packet. That's potentially nice for speed, but |
| 225 | * means receivers can't recover lost synch on their own (because |
| 226 | * new packets don't only start after a short RX). |
| 227 | */ |
| 228 | size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA; |
| 229 | size += dev->port_usb->header_len; |
| 230 | size += out->maxpacket - 1; |
| 231 | size -= size % out->maxpacket; |
| 232 | |
xerox_lin | 72ffa18 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 233 | if (dev->ul_max_pkts_per_xfer) |
| 234 | size *= dev->ul_max_pkts_per_xfer; |
| 235 | |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 236 | if (dev->port_usb->is_fixed) |
Stephen Hemminger | 45d1b7a | 2011-03-01 22:40:57 -0800 | [diff] [blame] | 237 | size = max_t(size_t, size, dev->port_usb->fixed_out_len); |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 238 | |
Amit Pundir | 246bfed | 2016-01-08 19:36:02 +0530 | [diff] [blame] | 239 | DBG(dev, "%s: size: %zd\n", __func__, size); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 240 | skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags); |
| 241 | if (skb == NULL) { |
| 242 | DBG(dev, "no rx skb\n"); |
| 243 | goto enomem; |
| 244 | } |
| 245 | |
| 246 | /* Some platforms perform better when IP packets are aligned, |
| 247 | * but on at least one, checksumming fails otherwise. Note: |
| 248 | * RNDIS headers involve variable numbers of LE32 values. |
| 249 | */ |
| 250 | skb_reserve(skb, NET_IP_ALIGN); |
| 251 | |
| 252 | req->buf = skb->data; |
| 253 | req->length = size; |
| 254 | req->complete = rx_complete; |
| 255 | req->context = skb; |
| 256 | |
| 257 | retval = usb_ep_queue(out, req, gfp_flags); |
| 258 | if (retval == -ENOMEM) |
| 259 | enomem: |
| 260 | defer_kevent(dev, WORK_RX_MEMORY); |
| 261 | if (retval) { |
| 262 | DBG(dev, "rx submit --> %d\n", retval); |
| 263 | if (skb) |
| 264 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 265 | } |
| 266 | return retval; |
| 267 | } |
| 268 | |
| 269 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) |
| 270 | { |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 271 | struct sk_buff *skb = req->context; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 272 | struct eth_dev *dev = ep->driver_data; |
| 273 | int status = req->status; |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 274 | bool queue = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 275 | |
| 276 | switch (status) { |
| 277 | |
| 278 | /* normal completion */ |
| 279 | case 0: |
| 280 | skb_put(skb, req->actual); |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 281 | |
| 282 | if (dev->unwrap) { |
| 283 | unsigned long flags; |
| 284 | |
| 285 | spin_lock_irqsave(&dev->lock, flags); |
| 286 | if (dev->port_usb) { |
| 287 | status = dev->unwrap(dev->port_usb, |
| 288 | skb, |
| 289 | &dev->rx_frames); |
Badhri Jagan Sridharan | ccf7707 | 2014-09-18 10:48:48 -0700 | [diff] [blame] | 290 | if (status == -EINVAL) |
| 291 | dev->net->stats.rx_errors++; |
| 292 | else if (status == -EOVERFLOW) |
| 293 | dev->net->stats.rx_over_errors++; |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 294 | } else { |
| 295 | dev_kfree_skb_any(skb); |
| 296 | status = -ENOTCONN; |
| 297 | } |
| 298 | spin_unlock_irqrestore(&dev->lock, flags); |
| 299 | } else { |
| 300 | skb_queue_tail(&dev->rx_frames, skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 301 | } |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 302 | if (!status) |
| 303 | queue = 1; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 304 | break; |
| 305 | |
| 306 | /* software-driven interface shutdown */ |
| 307 | case -ECONNRESET: /* unlink */ |
| 308 | case -ESHUTDOWN: /* disconnect etc */ |
| 309 | VDBG(dev, "rx shutdown, code %d\n", status); |
| 310 | goto quiesce; |
| 311 | |
| 312 | /* for hardware automagic (such as pxa) */ |
| 313 | case -ECONNABORTED: /* endpoint reset */ |
| 314 | DBG(dev, "rx %s reset\n", ep->name); |
| 315 | defer_kevent(dev, WORK_RX_MEMORY); |
| 316 | quiesce: |
| 317 | dev_kfree_skb_any(skb); |
| 318 | goto clean; |
| 319 | |
| 320 | /* data overrun */ |
| 321 | case -EOVERFLOW: |
| 322 | dev->net->stats.rx_over_errors++; |
| 323 | /* FALLTHROUGH */ |
| 324 | |
| 325 | default: |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 326 | queue = 1; |
| 327 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 328 | dev->net->stats.rx_errors++; |
| 329 | DBG(dev, "rx status %d\n", status); |
| 330 | break; |
| 331 | } |
| 332 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 333 | clean: |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 334 | spin_lock(&dev->req_lock); |
| 335 | list_add(&req->list, &dev->rx_reqs); |
| 336 | spin_unlock(&dev->req_lock); |
| 337 | |
| 338 | if (queue) |
| 339 | queue_work(uether_wq, &dev->rx_work); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n) |
| 343 | { |
| 344 | unsigned i; |
| 345 | struct usb_request *req; |
| 346 | |
| 347 | if (!n) |
| 348 | return -ENOMEM; |
| 349 | |
| 350 | /* queue/recycle up to N requests */ |
| 351 | i = n; |
| 352 | list_for_each_entry(req, list, list) { |
| 353 | if (i-- == 0) |
| 354 | goto extra; |
| 355 | } |
| 356 | while (i--) { |
| 357 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); |
| 358 | if (!req) |
| 359 | return list_empty(list) ? -ENOMEM : 0; |
| 360 | list_add(&req->list, list); |
| 361 | } |
| 362 | return 0; |
| 363 | |
| 364 | extra: |
| 365 | /* free extras */ |
| 366 | for (;;) { |
| 367 | struct list_head *next; |
| 368 | |
| 369 | next = req->list.next; |
| 370 | list_del(&req->list); |
| 371 | usb_ep_free_request(ep, req); |
| 372 | |
| 373 | if (next == list) |
| 374 | break; |
| 375 | |
| 376 | req = container_of(next, struct usb_request, list); |
| 377 | } |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n) |
| 382 | { |
| 383 | int status; |
| 384 | |
| 385 | spin_lock(&dev->req_lock); |
| 386 | status = prealloc(&dev->tx_reqs, link->in_ep, n); |
| 387 | if (status < 0) |
| 388 | goto fail; |
| 389 | status = prealloc(&dev->rx_reqs, link->out_ep, n); |
| 390 | if (status < 0) |
| 391 | goto fail; |
| 392 | goto done; |
| 393 | fail: |
| 394 | DBG(dev, "can't alloc requests\n"); |
| 395 | done: |
| 396 | spin_unlock(&dev->req_lock); |
| 397 | return status; |
| 398 | } |
| 399 | |
| 400 | static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags) |
| 401 | { |
| 402 | struct usb_request *req; |
| 403 | unsigned long flags; |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 404 | int req_cnt = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 405 | |
| 406 | /* fill unused rxq slots with some skb */ |
| 407 | spin_lock_irqsave(&dev->req_lock, flags); |
| 408 | while (!list_empty(&dev->rx_reqs)) { |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 409 | /* break the nexus of continuous completion and re-submission*/ |
Praneeth Bajjuri | aba8439 | 2015-01-22 16:38:56 -0600 | [diff] [blame] | 410 | if (++req_cnt > qlen(dev->gadget, dev->qmult)) |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 411 | break; |
| 412 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 413 | req = container_of(dev->rx_reqs.next, |
| 414 | struct usb_request, list); |
| 415 | list_del_init(&req->list); |
| 416 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 417 | |
| 418 | if (rx_submit(dev, req, gfp_flags) < 0) { |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 419 | spin_lock_irqsave(&dev->req_lock, flags); |
| 420 | list_add(&req->list, &dev->rx_reqs); |
| 421 | spin_unlock_irqrestore(&dev->req_lock, flags); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 422 | defer_kevent(dev, WORK_RX_MEMORY); |
| 423 | return; |
| 424 | } |
| 425 | |
| 426 | spin_lock_irqsave(&dev->req_lock, flags); |
| 427 | } |
| 428 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 429 | } |
| 430 | |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 431 | static void process_rx_w(struct work_struct *work) |
| 432 | { |
| 433 | struct eth_dev *dev = container_of(work, struct eth_dev, rx_work); |
| 434 | struct sk_buff *skb; |
| 435 | int status = 0; |
| 436 | |
| 437 | if (!dev->port_usb) |
| 438 | return; |
| 439 | |
| 440 | while ((skb = skb_dequeue(&dev->rx_frames))) { |
| 441 | if (status < 0 |
| 442 | || ETH_HLEN > skb->len |
| 443 | || skb->len > ETH_FRAME_LEN) { |
| 444 | dev->net->stats.rx_errors++; |
| 445 | dev->net->stats.rx_length_errors++; |
| 446 | DBG(dev, "rx length %d\n", skb->len); |
| 447 | dev_kfree_skb_any(skb); |
| 448 | continue; |
| 449 | } |
| 450 | skb->protocol = eth_type_trans(skb, dev->net); |
| 451 | dev->net->stats.rx_packets++; |
| 452 | dev->net->stats.rx_bytes += skb->len; |
| 453 | |
| 454 | status = netif_rx_ni(skb); |
| 455 | } |
| 456 | |
| 457 | if (netif_running(dev->net)) |
| 458 | rx_fill(dev, GFP_KERNEL); |
| 459 | } |
| 460 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 461 | static void eth_work(struct work_struct *work) |
| 462 | { |
| 463 | struct eth_dev *dev = container_of(work, struct eth_dev, work); |
| 464 | |
| 465 | if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) { |
| 466 | if (netif_running(dev->net)) |
| 467 | rx_fill(dev, GFP_KERNEL); |
| 468 | } |
| 469 | |
| 470 | if (dev->todo) |
| 471 | DBG(dev, "work done, flags = 0x%lx\n", dev->todo); |
| 472 | } |
| 473 | |
| 474 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) |
| 475 | { |
| 476 | struct sk_buff *skb = req->context; |
| 477 | struct eth_dev *dev = ep->driver_data; |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 478 | struct net_device *net = dev->net; |
| 479 | struct usb_request *new_req; |
| 480 | struct usb_ep *in; |
| 481 | int length; |
| 482 | int retval; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 483 | |
| 484 | switch (req->status) { |
| 485 | default: |
| 486 | dev->net->stats.tx_errors++; |
| 487 | VDBG(dev, "tx err %d\n", req->status); |
| 488 | /* FALLTHROUGH */ |
| 489 | case -ECONNRESET: /* unlink */ |
| 490 | case -ESHUTDOWN: /* disconnect etc */ |
| 491 | break; |
| 492 | case 0: |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 493 | if (!req->zero) |
| 494 | dev->net->stats.tx_bytes += req->length-1; |
| 495 | else |
| 496 | dev->net->stats.tx_bytes += req->length; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 497 | } |
| 498 | dev->net->stats.tx_packets++; |
| 499 | |
| 500 | spin_lock(&dev->req_lock); |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 501 | list_add_tail(&req->list, &dev->tx_reqs); |
| 502 | |
| 503 | if (dev->port_usb->multi_pkt_xfer) { |
| 504 | dev->no_tx_req_used--; |
| 505 | req->length = 0; |
| 506 | in = dev->port_usb->in_ep; |
| 507 | |
| 508 | if (!list_empty(&dev->tx_reqs)) { |
| 509 | new_req = container_of(dev->tx_reqs.next, |
| 510 | struct usb_request, list); |
| 511 | list_del(&new_req->list); |
| 512 | spin_unlock(&dev->req_lock); |
| 513 | if (new_req->length > 0) { |
| 514 | length = new_req->length; |
| 515 | |
| 516 | /* NCM requires no zlp if transfer is |
| 517 | * dwNtbInMaxSize */ |
| 518 | if (dev->port_usb->is_fixed && |
| 519 | length == dev->port_usb->fixed_in_len && |
| 520 | (length % in->maxpacket) == 0) |
| 521 | new_req->zero = 0; |
| 522 | else |
| 523 | new_req->zero = 1; |
| 524 | |
| 525 | /* use zlp framing on tx for strict CDC-Ether |
| 526 | * conformance, though any robust network rx |
| 527 | * path ignores extra padding. and some hardware |
| 528 | * doesn't like to write zlps. |
| 529 | */ |
| 530 | if (new_req->zero && !dev->zlp && |
| 531 | (length % in->maxpacket) == 0) { |
| 532 | new_req->zero = 0; |
| 533 | length++; |
| 534 | } |
| 535 | |
| 536 | new_req->length = length; |
| 537 | retval = usb_ep_queue(in, new_req, GFP_ATOMIC); |
| 538 | switch (retval) { |
| 539 | default: |
| 540 | DBG(dev, "tx queue err %d\n", retval); |
| 541 | break; |
| 542 | case 0: |
| 543 | spin_lock(&dev->req_lock); |
| 544 | dev->no_tx_req_used++; |
| 545 | spin_unlock(&dev->req_lock); |
Amit Pundir | c7b5efb | 2016-05-30 15:19:21 +0530 | [diff] [blame] | 546 | netif_trans_update(net); |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 547 | } |
| 548 | } else { |
| 549 | spin_lock(&dev->req_lock); |
| 550 | list_add(&new_req->list, &dev->tx_reqs); |
| 551 | spin_unlock(&dev->req_lock); |
| 552 | } |
| 553 | } else { |
| 554 | spin_unlock(&dev->req_lock); |
| 555 | } |
| 556 | } else { |
| 557 | spin_unlock(&dev->req_lock); |
| 558 | dev_kfree_skb_any(skb); |
| 559 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 560 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 561 | if (netif_carrier_ok(dev->net)) |
| 562 | netif_wake_queue(dev->net); |
| 563 | } |
| 564 | |
| 565 | static inline int is_promisc(u16 cdc_filter) |
| 566 | { |
| 567 | return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS; |
| 568 | } |
| 569 | |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 570 | static void alloc_tx_buffer(struct eth_dev *dev) |
| 571 | { |
| 572 | struct list_head *act; |
| 573 | struct usb_request *req; |
| 574 | |
xerox_lin | f053900 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 575 | dev->tx_req_bufsize = (dev->dl_max_pkts_per_xfer * |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 576 | (dev->net->mtu |
| 577 | + sizeof(struct ethhdr) |
| 578 | /* size of rndis_packet_msg_type */ |
| 579 | + 44 |
| 580 | + 22)); |
| 581 | |
| 582 | list_for_each(act, &dev->tx_reqs) { |
| 583 | req = container_of(act, struct usb_request, list); |
| 584 | if (!req->buf) |
| 585 | req->buf = kmalloc(dev->tx_req_bufsize, |
| 586 | GFP_ATOMIC); |
| 587 | } |
| 588 | } |
| 589 | |
Stephen Hemminger | 25a79c4 | 2009-08-31 19:50:45 +0000 | [diff] [blame] | 590 | static netdev_tx_t eth_start_xmit(struct sk_buff *skb, |
| 591 | struct net_device *net) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 592 | { |
| 593 | struct eth_dev *dev = netdev_priv(net); |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 594 | int length = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 595 | int retval; |
| 596 | struct usb_request *req = NULL; |
| 597 | unsigned long flags; |
| 598 | struct usb_ep *in; |
| 599 | u16 cdc_filter; |
| 600 | |
| 601 | spin_lock_irqsave(&dev->lock, flags); |
| 602 | if (dev->port_usb) { |
| 603 | in = dev->port_usb->in_ep; |
| 604 | cdc_filter = dev->port_usb->cdc_filter; |
| 605 | } else { |
| 606 | in = NULL; |
| 607 | cdc_filter = 0; |
| 608 | } |
| 609 | spin_unlock_irqrestore(&dev->lock, flags); |
| 610 | |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 611 | if (skb && !in) { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 612 | dev_kfree_skb_any(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 613 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 614 | } |
| 615 | |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 616 | /* Allocate memory for tx_reqs to support multi packet transfer */ |
| 617 | if (dev->port_usb->multi_pkt_xfer && !dev->tx_req_bufsize) |
| 618 | alloc_tx_buffer(dev); |
| 619 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 620 | /* apply outgoing CDC or RNDIS filters */ |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 621 | if (skb && !is_promisc(cdc_filter)) { |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 622 | u8 *dest = skb->data; |
| 623 | |
| 624 | if (is_multicast_ether_addr(dest)) { |
| 625 | u16 type; |
| 626 | |
| 627 | /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host |
| 628 | * SET_ETHERNET_MULTICAST_FILTERS requests |
| 629 | */ |
| 630 | if (is_broadcast_ether_addr(dest)) |
| 631 | type = USB_CDC_PACKET_TYPE_BROADCAST; |
| 632 | else |
| 633 | type = USB_CDC_PACKET_TYPE_ALL_MULTICAST; |
| 634 | if (!(cdc_filter & type)) { |
| 635 | dev_kfree_skb_any(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 636 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 637 | } |
| 638 | } |
| 639 | /* ignores USB_CDC_PACKET_TYPE_DIRECTED */ |
| 640 | } |
| 641 | |
| 642 | spin_lock_irqsave(&dev->req_lock, flags); |
| 643 | /* |
| 644 | * this freelist can be empty if an interrupt triggered disconnect() |
| 645 | * and reconfigured the gadget (shutting down this queue) after the |
| 646 | * network stack decided to xmit but before we got the spinlock. |
| 647 | */ |
| 648 | if (list_empty(&dev->tx_reqs)) { |
| 649 | spin_unlock_irqrestore(&dev->req_lock, flags); |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 650 | return NETDEV_TX_BUSY; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | req = container_of(dev->tx_reqs.next, struct usb_request, list); |
| 654 | list_del(&req->list); |
| 655 | |
| 656 | /* temporarily stop TX queue when the freelist empties */ |
| 657 | if (list_empty(&dev->tx_reqs)) |
| 658 | netif_stop_queue(net); |
| 659 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 660 | |
| 661 | /* no buffer copies needed, unless the network stack did it |
| 662 | * or the hardware can't use skb buffers. |
| 663 | * or there's not enough space for extra headers we need |
| 664 | */ |
| 665 | if (dev->wrap) { |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 666 | unsigned long flags; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 667 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 668 | spin_lock_irqsave(&dev->lock, flags); |
| 669 | if (dev->port_usb) |
| 670 | skb = dev->wrap(dev->port_usb, skb); |
| 671 | spin_unlock_irqrestore(&dev->lock, flags); |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 672 | if (!skb) { |
| 673 | /* Multi frame CDC protocols may store the frame for |
| 674 | * later which is not a dropped frame. |
| 675 | */ |
| 676 | if (dev->port_usb->supports_multi_frame) |
| 677 | goto multiframe; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 678 | goto drop; |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 679 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 680 | } |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 681 | |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 682 | spin_lock_irqsave(&dev->req_lock, flags); |
| 683 | dev->tx_skb_hold_count++; |
| 684 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 685 | |
| 686 | if (dev->port_usb->multi_pkt_xfer) { |
| 687 | memcpy(req->buf + req->length, skb->data, skb->len); |
| 688 | req->length = req->length + skb->len; |
| 689 | length = req->length; |
| 690 | dev_kfree_skb_any(skb); |
| 691 | |
| 692 | spin_lock_irqsave(&dev->req_lock, flags); |
xerox_lin | f053900 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 693 | if (dev->tx_skb_hold_count < dev->dl_max_pkts_per_xfer) { |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 694 | if (dev->no_tx_req_used > TX_REQ_THRESHOLD) { |
| 695 | list_add(&req->list, &dev->tx_reqs); |
| 696 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 697 | goto success; |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | dev->no_tx_req_used++; |
| 702 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 703 | |
| 704 | spin_lock_irqsave(&dev->lock, flags); |
| 705 | dev->tx_skb_hold_count = 0; |
| 706 | spin_unlock_irqrestore(&dev->lock, flags); |
| 707 | } else { |
| 708 | length = skb->len; |
| 709 | req->buf = skb->data; |
| 710 | req->context = skb; |
| 711 | } |
| 712 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 713 | req->complete = tx_complete; |
| 714 | |
Yauheni Kaliuta | 5c1168d | 2010-12-08 13:12:04 +0200 | [diff] [blame] | 715 | /* NCM requires no zlp if transfer is dwNtbInMaxSize */ |
| 716 | if (dev->port_usb->is_fixed && |
| 717 | length == dev->port_usb->fixed_in_len && |
| 718 | (length % in->maxpacket) == 0) |
| 719 | req->zero = 0; |
| 720 | else |
| 721 | req->zero = 1; |
| 722 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 723 | /* use zlp framing on tx for strict CDC-Ether conformance, |
| 724 | * though any robust network rx path ignores extra padding. |
| 725 | * and some hardware doesn't like to write zlps. |
| 726 | */ |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 727 | if (req->zero && !dev->zlp && (length % in->maxpacket) == 0) { |
| 728 | req->zero = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 729 | length++; |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 730 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 731 | |
| 732 | req->length = length; |
| 733 | |
Badhri Jagan Sridharan | 3c0f288 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 734 | /* throttle highspeed IRQ rate back slightly */ |
| 735 | if (gadget_is_dualspeed(dev->gadget) && |
| 736 | (dev->gadget->speed == USB_SPEED_HIGH)) { |
| 737 | dev->tx_qlen++; |
Praneeth Bajjuri | aba8439 | 2015-01-22 16:38:56 -0600 | [diff] [blame] | 738 | if (dev->tx_qlen == (dev->qmult/2)) { |
Badhri Jagan Sridharan | 3c0f288 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 739 | req->no_interrupt = 0; |
| 740 | dev->tx_qlen = 0; |
| 741 | } else { |
| 742 | req->no_interrupt = 1; |
| 743 | } |
| 744 | } else { |
| 745 | req->no_interrupt = 0; |
| 746 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 747 | |
| 748 | retval = usb_ep_queue(in, req, GFP_ATOMIC); |
| 749 | switch (retval) { |
| 750 | default: |
| 751 | DBG(dev, "tx queue err %d\n", retval); |
| 752 | break; |
| 753 | case 0: |
Florian Westphal | 860e953 | 2016-05-03 16:33:13 +0200 | [diff] [blame] | 754 | netif_trans_update(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 755 | } |
| 756 | |
| 757 | if (retval) { |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 758 | if (!dev->port_usb->multi_pkt_xfer) |
| 759 | dev_kfree_skb_any(skb); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 760 | drop: |
| 761 | dev->net->stats.tx_dropped++; |
Jim Baxter | 6d3865f | 2014-07-07 18:33:18 +0100 | [diff] [blame] | 762 | multiframe: |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 763 | spin_lock_irqsave(&dev->req_lock, flags); |
| 764 | if (list_empty(&dev->tx_reqs)) |
| 765 | netif_start_queue(net); |
| 766 | list_add(&req->list, &dev->tx_reqs); |
| 767 | spin_unlock_irqrestore(&dev->req_lock, flags); |
| 768 | } |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 769 | success: |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 770 | return NETDEV_TX_OK; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | /*-------------------------------------------------------------------------*/ |
| 774 | |
| 775 | static void eth_start(struct eth_dev *dev, gfp_t gfp_flags) |
| 776 | { |
| 777 | DBG(dev, "%s\n", __func__); |
| 778 | |
| 779 | /* fill the rx queue */ |
| 780 | rx_fill(dev, gfp_flags); |
| 781 | |
| 782 | /* and open the tx floodgates */ |
Badhri Jagan Sridharan | 3c0f288 | 2014-09-18 10:42:41 -0700 | [diff] [blame] | 783 | dev->tx_qlen = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 784 | netif_wake_queue(dev->net); |
| 785 | } |
| 786 | |
| 787 | static int eth_open(struct net_device *net) |
| 788 | { |
| 789 | struct eth_dev *dev = netdev_priv(net); |
| 790 | struct gether *link; |
| 791 | |
| 792 | DBG(dev, "%s\n", __func__); |
| 793 | if (netif_carrier_ok(dev->net)) |
| 794 | eth_start(dev, GFP_KERNEL); |
| 795 | |
| 796 | spin_lock_irq(&dev->lock); |
| 797 | link = dev->port_usb; |
| 798 | if (link && link->open) |
| 799 | link->open(link); |
| 800 | spin_unlock_irq(&dev->lock); |
| 801 | |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | static int eth_stop(struct net_device *net) |
| 806 | { |
| 807 | struct eth_dev *dev = netdev_priv(net); |
| 808 | unsigned long flags; |
| 809 | |
| 810 | VDBG(dev, "%s\n", __func__); |
| 811 | netif_stop_queue(net); |
| 812 | |
| 813 | DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", |
| 814 | dev->net->stats.rx_packets, dev->net->stats.tx_packets, |
| 815 | dev->net->stats.rx_errors, dev->net->stats.tx_errors |
| 816 | ); |
| 817 | |
| 818 | /* ensure there are no more active requests */ |
| 819 | spin_lock_irqsave(&dev->lock, flags); |
| 820 | if (dev->port_usb) { |
| 821 | struct gether *link = dev->port_usb; |
Michael Grzeschik | b1b552a | 2012-08-08 11:48:10 +0200 | [diff] [blame] | 822 | const struct usb_endpoint_descriptor *in; |
| 823 | const struct usb_endpoint_descriptor *out; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 824 | |
| 825 | if (link->close) |
| 826 | link->close(link); |
| 827 | |
| 828 | /* NOTE: we have no abort-queue primitive we could use |
| 829 | * to cancel all pending I/O. Instead, we disable then |
| 830 | * reenable the endpoints ... this idiom may leave toggle |
| 831 | * wrong, but that's a self-correcting error. |
| 832 | * |
| 833 | * REVISIT: we *COULD* just let the transfers complete at |
| 834 | * their own pace; the network stack can handle old packets. |
| 835 | * For the moment we leave this here, since it works. |
| 836 | */ |
Michael Grzeschik | b1b552a | 2012-08-08 11:48:10 +0200 | [diff] [blame] | 837 | in = link->in_ep->desc; |
| 838 | out = link->out_ep->desc; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 839 | usb_ep_disable(link->in_ep); |
| 840 | usb_ep_disable(link->out_ep); |
| 841 | if (netif_carrier_ok(net)) { |
| 842 | DBG(dev, "host still using in/out endpoints\n"); |
Michael Grzeschik | b1b552a | 2012-08-08 11:48:10 +0200 | [diff] [blame] | 843 | link->in_ep->desc = in; |
| 844 | link->out_ep->desc = out; |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 845 | usb_ep_enable(link->in_ep); |
| 846 | usb_ep_enable(link->out_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 847 | } |
| 848 | } |
| 849 | spin_unlock_irqrestore(&dev->lock, flags); |
| 850 | |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | /*-------------------------------------------------------------------------*/ |
| 855 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 856 | static int get_ether_addr(const char *str, u8 *dev_addr) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 857 | { |
| 858 | if (str) { |
| 859 | unsigned i; |
| 860 | |
| 861 | for (i = 0; i < 6; i++) { |
| 862 | unsigned char num; |
| 863 | |
| 864 | if ((*str == '.') || (*str == ':')) |
| 865 | str++; |
Andy Shevchenko | e644814 | 2010-06-15 17:04:44 +0300 | [diff] [blame] | 866 | num = hex_to_bin(*str++) << 4; |
| 867 | num |= hex_to_bin(*str++); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 868 | dev_addr [i] = num; |
| 869 | } |
| 870 | if (is_valid_ether_addr(dev_addr)) |
| 871 | return 0; |
| 872 | } |
Joe Perches | 006c913 | 2012-07-12 22:33:11 -0700 | [diff] [blame] | 873 | eth_random_addr(dev_addr); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 874 | return 1; |
| 875 | } |
| 876 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 877 | static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len) |
| 878 | { |
| 879 | if (len < 18) |
| 880 | return -EINVAL; |
| 881 | |
Andy Shevchenko | 27f3870 | 2015-01-15 13:40:04 +0200 | [diff] [blame] | 882 | snprintf(str, len, "%pM", dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 883 | return 18; |
| 884 | } |
| 885 | |
Stephen Hemminger | 5ec38f3 | 2009-01-07 18:05:39 -0800 | [diff] [blame] | 886 | static const struct net_device_ops eth_netdev_ops = { |
| 887 | .ndo_open = eth_open, |
| 888 | .ndo_stop = eth_stop, |
| 889 | .ndo_start_xmit = eth_start_xmit, |
| 890 | .ndo_change_mtu = ueth_change_mtu, |
| 891 | .ndo_set_mac_address = eth_mac_addr, |
| 892 | .ndo_validate_addr = eth_validate_addr, |
| 893 | }; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 894 | |
Marcel Holtmann | aa79074 | 2010-01-15 22:13:58 -0800 | [diff] [blame] | 895 | static struct device_type gadget_type = { |
| 896 | .name = "gadget", |
| 897 | }; |
| 898 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 899 | /** |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 900 | * gether_setup_name - initialize one ethernet-over-usb link |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 901 | * @g: gadget to associated with these links |
| 902 | * @ethaddr: NULL, or a buffer in which the ethernet address of the |
| 903 | * host side of the link is recorded |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 904 | * @netname: name for network device (for example, "usb") |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 905 | * Context: may sleep |
| 906 | * |
| 907 | * This sets up the single network link that may be exported by a |
| 908 | * gadget driver using this framework. The link layer addresses are |
| 909 | * set up using module parameters. |
| 910 | * |
Dan Carpenter | 574f24f | 2013-11-14 11:42:11 +0300 | [diff] [blame] | 911 | * 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] | 912 | */ |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 913 | struct eth_dev *gether_setup_name(struct usb_gadget *g, |
| 914 | const char *dev_addr, const char *host_addr, |
| 915 | u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 916 | { |
| 917 | struct eth_dev *dev; |
| 918 | struct net_device *net; |
| 919 | int status; |
| 920 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 921 | net = alloc_etherdev(sizeof *dev); |
| 922 | if (!net) |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 923 | return ERR_PTR(-ENOMEM); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 924 | |
| 925 | dev = netdev_priv(net); |
| 926 | spin_lock_init(&dev->lock); |
| 927 | spin_lock_init(&dev->req_lock); |
| 928 | INIT_WORK(&dev->work, eth_work); |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 929 | INIT_WORK(&dev->rx_work, process_rx_w); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 930 | INIT_LIST_HEAD(&dev->tx_reqs); |
| 931 | INIT_LIST_HEAD(&dev->rx_reqs); |
| 932 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 933 | skb_queue_head_init(&dev->rx_frames); |
| 934 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 935 | /* network device setup */ |
| 936 | dev->net = net; |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 937 | dev->qmult = qmult; |
Mike Lockwood | 036e98b | 2012-05-10 10:08:02 +0200 | [diff] [blame] | 938 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 939 | |
| 940 | if (get_ether_addr(dev_addr, net->dev_addr)) |
| 941 | dev_warn(&g->dev, |
| 942 | "using random %s ethernet address\n", "self"); |
| 943 | if (get_ether_addr(host_addr, dev->host_mac)) |
| 944 | dev_warn(&g->dev, |
| 945 | "using random %s ethernet address\n", "host"); |
| 946 | |
| 947 | if (ethaddr) |
| 948 | memcpy(ethaddr, dev->host_mac, ETH_ALEN); |
| 949 | |
Stephen Hemminger | 5ec38f3 | 2009-01-07 18:05:39 -0800 | [diff] [blame] | 950 | net->netdev_ops = ð_netdev_ops; |
| 951 | |
Wilfried Klaebe | 7ad24ea | 2014-05-11 00:12:32 +0000 | [diff] [blame] | 952 | net->ethtool_ops = &ops; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 953 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 954 | dev->gadget = g; |
| 955 | SET_NETDEV_DEV(net, &g->dev); |
Marcel Holtmann | aa79074 | 2010-01-15 22:13:58 -0800 | [diff] [blame] | 956 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 957 | |
| 958 | status = register_netdev(net); |
| 959 | if (status < 0) { |
| 960 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); |
| 961 | free_netdev(net); |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 962 | dev = ERR_PTR(status); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 963 | } else { |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 964 | INFO(dev, "MAC %pM\n", net->dev_addr); |
| 965 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 966 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 967 | /* |
| 968 | * two kinds of host-initiated state changes: |
Kevin Cernekee | 31bde1c | 2012-06-24 21:11:22 -0700 | [diff] [blame] | 969 | * - iff DATA transfer is active, carrier is "on" |
| 970 | * - tx queueing enabled if open *and* carrier is "on" |
| 971 | */ |
| 972 | netif_carrier_off(net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 973 | } |
| 974 | |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 975 | return dev; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 976 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 977 | EXPORT_SYMBOL_GPL(gether_setup_name); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 978 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 979 | struct net_device *gether_setup_name_default(const char *netname) |
| 980 | { |
| 981 | struct net_device *net; |
| 982 | struct eth_dev *dev; |
| 983 | |
| 984 | net = alloc_etherdev(sizeof(*dev)); |
| 985 | if (!net) |
| 986 | return ERR_PTR(-ENOMEM); |
| 987 | |
| 988 | dev = netdev_priv(net); |
| 989 | spin_lock_init(&dev->lock); |
| 990 | spin_lock_init(&dev->req_lock); |
| 991 | INIT_WORK(&dev->work, eth_work); |
Matthew Moeller | 8083c7c | 2016-03-09 20:19:25 -0600 | [diff] [blame] | 992 | INIT_WORK(&dev->rx_work, process_rx_w); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 993 | INIT_LIST_HEAD(&dev->tx_reqs); |
| 994 | INIT_LIST_HEAD(&dev->rx_reqs); |
| 995 | |
| 996 | skb_queue_head_init(&dev->rx_frames); |
| 997 | |
| 998 | /* network device setup */ |
| 999 | dev->net = net; |
| 1000 | dev->qmult = QMULT_DEFAULT; |
| 1001 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
| 1002 | |
| 1003 | eth_random_addr(dev->dev_mac); |
| 1004 | pr_warn("using random %s ethernet address\n", "self"); |
| 1005 | eth_random_addr(dev->host_mac); |
| 1006 | pr_warn("using random %s ethernet address\n", "host"); |
| 1007 | |
| 1008 | net->netdev_ops = ð_netdev_ops; |
| 1009 | |
Wilfried Klaebe | 7ad24ea | 2014-05-11 00:12:32 +0000 | [diff] [blame] | 1010 | net->ethtool_ops = &ops; |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1011 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
| 1012 | |
| 1013 | return net; |
| 1014 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1015 | EXPORT_SYMBOL_GPL(gether_setup_name_default); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1016 | |
| 1017 | int gether_register_netdev(struct net_device *net) |
| 1018 | { |
| 1019 | struct eth_dev *dev; |
| 1020 | struct usb_gadget *g; |
| 1021 | struct sockaddr sa; |
| 1022 | int status; |
| 1023 | |
| 1024 | if (!net->dev.parent) |
| 1025 | return -EINVAL; |
| 1026 | dev = netdev_priv(net); |
| 1027 | g = dev->gadget; |
| 1028 | status = register_netdev(net); |
| 1029 | if (status < 0) { |
| 1030 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); |
| 1031 | return status; |
| 1032 | } else { |
| 1033 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); |
| 1034 | |
| 1035 | /* two kinds of host-initiated state changes: |
| 1036 | * - iff DATA transfer is active, carrier is "on" |
| 1037 | * - tx queueing enabled if open *and* carrier is "on" |
| 1038 | */ |
| 1039 | netif_carrier_off(net); |
| 1040 | } |
| 1041 | sa.sa_family = net->type; |
| 1042 | memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN); |
| 1043 | rtnl_lock(); |
| 1044 | status = dev_set_mac_address(net, &sa); |
| 1045 | rtnl_unlock(); |
| 1046 | if (status) |
| 1047 | pr_warn("cannot set self ethernet address: %d\n", status); |
| 1048 | else |
| 1049 | INFO(dev, "MAC %pM\n", dev->dev_mac); |
| 1050 | |
| 1051 | return status; |
| 1052 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1053 | EXPORT_SYMBOL_GPL(gether_register_netdev); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1054 | |
| 1055 | void gether_set_gadget(struct net_device *net, struct usb_gadget *g) |
| 1056 | { |
| 1057 | struct eth_dev *dev; |
| 1058 | |
| 1059 | dev = netdev_priv(net); |
| 1060 | dev->gadget = g; |
| 1061 | SET_NETDEV_DEV(net, &g->dev); |
| 1062 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1063 | EXPORT_SYMBOL_GPL(gether_set_gadget); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1064 | |
| 1065 | int gether_set_dev_addr(struct net_device *net, const char *dev_addr) |
| 1066 | { |
| 1067 | struct eth_dev *dev; |
| 1068 | u8 new_addr[ETH_ALEN]; |
| 1069 | |
| 1070 | dev = netdev_priv(net); |
| 1071 | if (get_ether_addr(dev_addr, new_addr)) |
| 1072 | return -EINVAL; |
| 1073 | memcpy(dev->dev_mac, new_addr, ETH_ALEN); |
| 1074 | return 0; |
| 1075 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1076 | EXPORT_SYMBOL_GPL(gether_set_dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1077 | |
| 1078 | int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len) |
| 1079 | { |
| 1080 | struct eth_dev *dev; |
| 1081 | |
| 1082 | dev = netdev_priv(net); |
| 1083 | return get_ether_addr_str(dev->dev_mac, dev_addr, len); |
| 1084 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1085 | EXPORT_SYMBOL_GPL(gether_get_dev_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1086 | |
| 1087 | int gether_set_host_addr(struct net_device *net, const char *host_addr) |
| 1088 | { |
| 1089 | struct eth_dev *dev; |
| 1090 | u8 new_addr[ETH_ALEN]; |
| 1091 | |
| 1092 | dev = netdev_priv(net); |
| 1093 | if (get_ether_addr(host_addr, new_addr)) |
| 1094 | return -EINVAL; |
| 1095 | memcpy(dev->host_mac, new_addr, ETH_ALEN); |
| 1096 | return 0; |
| 1097 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1098 | EXPORT_SYMBOL_GPL(gether_set_host_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1099 | |
| 1100 | int gether_get_host_addr(struct net_device *net, char *host_addr, int len) |
| 1101 | { |
| 1102 | struct eth_dev *dev; |
| 1103 | |
| 1104 | dev = netdev_priv(net); |
| 1105 | return get_ether_addr_str(dev->host_mac, host_addr, len); |
| 1106 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1107 | EXPORT_SYMBOL_GPL(gether_get_host_addr); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1108 | |
| 1109 | int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len) |
| 1110 | { |
| 1111 | struct eth_dev *dev; |
| 1112 | |
| 1113 | if (len < 13) |
| 1114 | return -EINVAL; |
| 1115 | |
| 1116 | dev = netdev_priv(net); |
| 1117 | snprintf(host_addr, len, "%pm", dev->host_mac); |
| 1118 | |
| 1119 | return strlen(host_addr); |
| 1120 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1121 | EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1122 | |
Andrzej Pietrasiewicz | bf4277c | 2013-05-28 09:15:45 +0200 | [diff] [blame] | 1123 | void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]) |
| 1124 | { |
| 1125 | struct eth_dev *dev; |
| 1126 | |
| 1127 | dev = netdev_priv(net); |
| 1128 | memcpy(host_mac, dev->host_mac, ETH_ALEN); |
| 1129 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1130 | EXPORT_SYMBOL_GPL(gether_get_host_addr_u8); |
Andrzej Pietrasiewicz | bf4277c | 2013-05-28 09:15:45 +0200 | [diff] [blame] | 1131 | |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1132 | void gether_set_qmult(struct net_device *net, unsigned qmult) |
| 1133 | { |
| 1134 | struct eth_dev *dev; |
| 1135 | |
| 1136 | dev = netdev_priv(net); |
| 1137 | dev->qmult = qmult; |
| 1138 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1139 | EXPORT_SYMBOL_GPL(gether_set_qmult); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1140 | |
| 1141 | unsigned gether_get_qmult(struct net_device *net) |
| 1142 | { |
| 1143 | struct eth_dev *dev; |
| 1144 | |
| 1145 | dev = netdev_priv(net); |
| 1146 | return dev->qmult; |
| 1147 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1148 | EXPORT_SYMBOL_GPL(gether_get_qmult); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1149 | |
| 1150 | int gether_get_ifname(struct net_device *net, char *name, int len) |
| 1151 | { |
| 1152 | rtnl_lock(); |
| 1153 | strlcpy(name, netdev_name(net), len); |
| 1154 | rtnl_unlock(); |
| 1155 | return strlen(name); |
| 1156 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1157 | EXPORT_SYMBOL_GPL(gether_get_ifname); |
Andrzej Pietrasiewicz | bcd4a1c | 2013-05-23 09:22:05 +0200 | [diff] [blame] | 1158 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1159 | /** |
| 1160 | * gether_cleanup - remove Ethernet-over-USB device |
| 1161 | * Context: may sleep |
| 1162 | * |
| 1163 | * This is called to free all resources allocated by @gether_setup(). |
| 1164 | */ |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1165 | void gether_cleanup(struct eth_dev *dev) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1166 | { |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1167 | if (!dev) |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1168 | return; |
| 1169 | |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1170 | unregister_netdev(dev->net); |
| 1171 | flush_work(&dev->work); |
| 1172 | free_netdev(dev->net); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1173 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1174 | EXPORT_SYMBOL_GPL(gether_cleanup); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1175 | |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1176 | /** |
| 1177 | * gether_connect - notify network layer that USB link is active |
| 1178 | * @link: the USB link, set up with endpoints, descriptors matching |
| 1179 | * current device speed, and any framing wrapper(s) set up. |
| 1180 | * Context: irqs blocked |
| 1181 | * |
| 1182 | * This is called to activate endpoints and let the network layer know |
| 1183 | * the connection is active ("carrier detect"). It may cause the I/O |
| 1184 | * queues to open and start letting network packets flow, but will in |
| 1185 | * any case activate the endpoints so that they respond properly to the |
| 1186 | * USB host. |
| 1187 | * |
| 1188 | * Verify net_device pointer returned using IS_ERR(). If it doesn't |
| 1189 | * indicate some error code (negative errno), ep->driver_data values |
| 1190 | * have been overwritten. |
| 1191 | */ |
| 1192 | struct net_device *gether_connect(struct gether *link) |
| 1193 | { |
Sebastian Andrzej Siewior | d6a0143 | 2012-12-23 21:10:12 +0100 | [diff] [blame] | 1194 | struct eth_dev *dev = link->ioport; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1195 | int result = 0; |
| 1196 | |
| 1197 | if (!dev) |
| 1198 | return ERR_PTR(-EINVAL); |
| 1199 | |
| 1200 | link->in_ep->driver_data = dev; |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 1201 | result = usb_ep_enable(link->in_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1202 | if (result != 0) { |
| 1203 | DBG(dev, "enable %s --> %d\n", |
| 1204 | link->in_ep->name, result); |
| 1205 | goto fail0; |
| 1206 | } |
| 1207 | |
| 1208 | link->out_ep->driver_data = dev; |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 1209 | result = usb_ep_enable(link->out_ep); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1210 | if (result != 0) { |
| 1211 | DBG(dev, "enable %s --> %d\n", |
| 1212 | link->out_ep->name, result); |
| 1213 | goto fail1; |
| 1214 | } |
| 1215 | |
| 1216 | if (result == 0) |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1217 | result = alloc_requests(dev, link, qlen(dev->gadget, |
| 1218 | dev->qmult)); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1219 | |
| 1220 | if (result == 0) { |
| 1221 | dev->zlp = link->is_zlp_ok; |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1222 | DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult)); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1223 | |
| 1224 | dev->header_len = link->header_len; |
| 1225 | dev->unwrap = link->unwrap; |
| 1226 | dev->wrap = link->wrap; |
xerox_lin | 72ffa18 | 2014-08-14 14:48:44 +0800 | [diff] [blame] | 1227 | dev->ul_max_pkts_per_xfer = link->ul_max_pkts_per_xfer; |
xerox_lin | f053900 | 2014-09-04 16:01:59 +0800 | [diff] [blame] | 1228 | dev->dl_max_pkts_per_xfer = link->dl_max_pkts_per_xfer; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1229 | |
| 1230 | spin_lock(&dev->lock); |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 1231 | dev->tx_skb_hold_count = 0; |
| 1232 | dev->no_tx_req_used = 0; |
| 1233 | dev->tx_req_bufsize = 0; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1234 | dev->port_usb = link; |
David Brownell | 29bac7b | 2008-09-06 21:33:49 -0700 | [diff] [blame] | 1235 | if (netif_running(dev->net)) { |
| 1236 | if (link->open) |
| 1237 | link->open(link); |
| 1238 | } else { |
| 1239 | if (link->close) |
| 1240 | link->close(link); |
| 1241 | } |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1242 | spin_unlock(&dev->lock); |
| 1243 | |
| 1244 | netif_carrier_on(dev->net); |
| 1245 | if (netif_running(dev->net)) |
| 1246 | eth_start(dev, GFP_ATOMIC); |
| 1247 | |
| 1248 | /* on error, disable any endpoints */ |
| 1249 | } else { |
| 1250 | (void) usb_ep_disable(link->out_ep); |
| 1251 | fail1: |
| 1252 | (void) usb_ep_disable(link->in_ep); |
| 1253 | } |
| 1254 | fail0: |
| 1255 | /* caller is responsible for cleanup on error */ |
| 1256 | if (result < 0) |
| 1257 | return ERR_PTR(result); |
| 1258 | return dev->net; |
| 1259 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1260 | EXPORT_SYMBOL_GPL(gether_connect); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1261 | |
| 1262 | /** |
| 1263 | * gether_disconnect - notify network layer that USB link is inactive |
| 1264 | * @link: the USB link, on which gether_connect() was called |
| 1265 | * Context: irqs blocked |
| 1266 | * |
| 1267 | * This is called to deactivate endpoints and let the network layer know |
| 1268 | * the connection went inactive ("no carrier"). |
| 1269 | * |
| 1270 | * On return, the state is as if gether_connect() had never been called. |
| 1271 | * The endpoints are inactive, and accordingly without active USB I/O. |
| 1272 | * Pointers to endpoint descriptors and endpoint private data are nulled. |
| 1273 | */ |
| 1274 | void gether_disconnect(struct gether *link) |
| 1275 | { |
| 1276 | struct eth_dev *dev = link->ioport; |
| 1277 | struct usb_request *req; |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1278 | struct sk_buff *skb; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1279 | |
| 1280 | WARN_ON(!dev); |
| 1281 | if (!dev) |
| 1282 | return; |
| 1283 | |
| 1284 | DBG(dev, "%s\n", __func__); |
| 1285 | |
| 1286 | netif_stop_queue(dev->net); |
| 1287 | netif_carrier_off(dev->net); |
| 1288 | |
| 1289 | /* disable endpoints, forcing (synchronous) completion |
| 1290 | * of all pending i/o. then free the request objects |
| 1291 | * and forget about the endpoints. |
| 1292 | */ |
| 1293 | usb_ep_disable(link->in_ep); |
| 1294 | spin_lock(&dev->req_lock); |
| 1295 | while (!list_empty(&dev->tx_reqs)) { |
| 1296 | req = container_of(dev->tx_reqs.next, |
| 1297 | struct usb_request, list); |
| 1298 | list_del(&req->list); |
| 1299 | |
| 1300 | spin_unlock(&dev->req_lock); |
Badhri Jagan Sridharan | b7a343a | 2014-09-18 10:46:08 -0700 | [diff] [blame] | 1301 | if (link->multi_pkt_xfer) |
| 1302 | kfree(req->buf); |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1303 | usb_ep_free_request(link->in_ep, req); |
| 1304 | spin_lock(&dev->req_lock); |
| 1305 | } |
| 1306 | spin_unlock(&dev->req_lock); |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 1307 | link->in_ep->desc = NULL; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1308 | |
| 1309 | usb_ep_disable(link->out_ep); |
| 1310 | spin_lock(&dev->req_lock); |
| 1311 | while (!list_empty(&dev->rx_reqs)) { |
| 1312 | req = container_of(dev->rx_reqs.next, |
| 1313 | struct usb_request, list); |
| 1314 | list_del(&req->list); |
| 1315 | |
| 1316 | spin_unlock(&dev->req_lock); |
| 1317 | usb_ep_free_request(link->out_ep, req); |
| 1318 | spin_lock(&dev->req_lock); |
| 1319 | } |
| 1320 | spin_unlock(&dev->req_lock); |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1321 | |
| 1322 | spin_lock(&dev->rx_frames.lock); |
| 1323 | while ((skb = __skb_dequeue(&dev->rx_frames))) |
| 1324 | dev_kfree_skb_any(skb); |
| 1325 | spin_unlock(&dev->rx_frames.lock); |
| 1326 | |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 1327 | link->out_ep->desc = NULL; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1328 | |
| 1329 | /* finish forgetting about this USB link episode */ |
| 1330 | dev->header_len = 0; |
| 1331 | dev->unwrap = NULL; |
| 1332 | dev->wrap = NULL; |
| 1333 | |
| 1334 | spin_lock(&dev->lock); |
| 1335 | dev->port_usb = NULL; |
David Brownell | 2b3d942 | 2008-06-19 18:19:28 -0700 | [diff] [blame] | 1336 | spin_unlock(&dev->lock); |
| 1337 | } |
Felipe Balbi | 0700faa | 2014-04-01 13:19:32 -0500 | [diff] [blame] | 1338 | EXPORT_SYMBOL_GPL(gether_disconnect); |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1339 | |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1340 | static int __init gether_init(void) |
| 1341 | { |
| 1342 | uether_wq = create_singlethread_workqueue("uether"); |
| 1343 | if (!uether_wq) { |
| 1344 | pr_err("%s: Unable to create workqueue: uether\n", __func__); |
| 1345 | return -ENOMEM; |
| 1346 | } |
| 1347 | return 0; |
| 1348 | } |
| 1349 | module_init(gether_init); |
| 1350 | |
| 1351 | static void __exit gether_exit(void) |
| 1352 | { |
| 1353 | destroy_workqueue(uether_wq); |
| 1354 | |
| 1355 | } |
| 1356 | module_exit(gether_exit); |
Andrzej Pietrasiewicz | f1a1823 | 2013-05-23 09:22:03 +0200 | [diff] [blame] | 1357 | MODULE_AUTHOR("David Brownell"); |
Badhri Jagan Sridharan | 16a203f | 2014-09-24 18:58:23 -0700 | [diff] [blame] | 1358 | MODULE_DESCRIPTION("ethernet over USB driver"); |
| 1359 | MODULE_LICENSE("GPL v2"); |