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authorDavid Vrabel <david.vrabel@csr.com>2010-10-25 08:57:32 -0400
committerDavid Vrabel <david.vrabel@csr.com>2010-10-25 09:03:45 -0400
commit446396bfab00392010ebc36b9ccf859935b0f17b (patch)
tree7612ca4ed9f6cbd9e4341e7c3deae1634d3d87d8 /drivers/uwb/wlp/txrx.c
parent229aebb873e29726b91e076161649cf45154b0bf (diff)
uwb: Remove the WLP subsystem and drivers
The only Wimedia LLC Protocol (WLP) hardware was an Intel i1480 chip with a beta release of firmware that was never commercially available as a product. This hardware and firmware is no longer available as Intel sold their UWB/WLP IP. I also see little prospect of other WLP capable hardware ever being available. Signed-off-by: David Vrabel <david.vrabel@csr.com>
Diffstat (limited to 'drivers/uwb/wlp/txrx.c')
-rw-r--r--drivers/uwb/wlp/txrx.c354
1 files changed, 0 insertions, 354 deletions
diff --git a/drivers/uwb/wlp/txrx.c b/drivers/uwb/wlp/txrx.c
deleted file mode 100644
index 05dde44b3592..000000000000
--- a/drivers/uwb/wlp/txrx.c
+++ /dev/null
@@ -1,354 +0,0 @@
1/*
2 * WiMedia Logical Link Control Protocol (WLP)
3 * Message exchange infrastructure
4 *
5 * Copyright (C) 2007 Intel Corporation
6 * Reinette Chatre <reinette.chatre@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 * 02110-1301, USA.
21 *
22 *
23 * FIXME: Docs
24 *
25 */
26
27#include <linux/etherdevice.h>
28#include <linux/slab.h>
29#include <linux/wlp.h>
30
31#include "wlp-internal.h"
32
33/*
34 * Direct incoming association msg to correct parsing routine
35 *
36 * We only expect D1, E1, C1, C3 messages as new. All other incoming
37 * association messages should form part of an established session that is
38 * handled elsewhere.
39 * The handling of these messages often require calling sleeping functions
40 * - this cannot be done in interrupt context. We use the kernel's
41 * workqueue to handle these messages.
42 */
43static
44void wlp_direct_assoc_frame(struct wlp *wlp, struct sk_buff *skb,
45 struct uwb_dev_addr *src)
46{
47 struct device *dev = &wlp->rc->uwb_dev.dev;
48 struct wlp_frame_assoc *assoc = (void *) skb->data;
49 struct wlp_assoc_frame_ctx *frame_ctx;
50
51 frame_ctx = kmalloc(sizeof(*frame_ctx), GFP_ATOMIC);
52 if (frame_ctx == NULL) {
53 dev_err(dev, "WLP: Unable to allocate memory for association "
54 "frame handling.\n");
55 kfree_skb(skb);
56 return;
57 }
58 frame_ctx->wlp = wlp;
59 frame_ctx->skb = skb;
60 frame_ctx->src = *src;
61 switch (assoc->type) {
62 case WLP_ASSOC_D1:
63 INIT_WORK(&frame_ctx->ws, wlp_handle_d1_frame);
64 schedule_work(&frame_ctx->ws);
65 break;
66 case WLP_ASSOC_E1:
67 kfree_skb(skb); /* Temporary until we handle it */
68 kfree(frame_ctx); /* Temporary until we handle it */
69 break;
70 case WLP_ASSOC_C1:
71 INIT_WORK(&frame_ctx->ws, wlp_handle_c1_frame);
72 schedule_work(&frame_ctx->ws);
73 break;
74 case WLP_ASSOC_C3:
75 INIT_WORK(&frame_ctx->ws, wlp_handle_c3_frame);
76 schedule_work(&frame_ctx->ws);
77 break;
78 default:
79 dev_err(dev, "Received unexpected association frame. "
80 "Type = %d \n", assoc->type);
81 kfree_skb(skb);
82 kfree(frame_ctx);
83 break;
84 }
85}
86
87/*
88 * Process incoming association frame
89 *
90 * Although it could be possible to deal with some incoming association
91 * messages without creating a new session we are keeping things simple. We
92 * do not accept new association messages if there is a session in progress
93 * and the messages do not belong to that session.
94 *
95 * If an association message arrives that causes the creation of a session
96 * (WLP_ASSOC_E1) while we are in the process of creating a session then we
97 * rely on the neighbor mutex to protect the data. That is, the new session
98 * will not be started until the previous is completed.
99 */
100static
101void wlp_receive_assoc_frame(struct wlp *wlp, struct sk_buff *skb,
102 struct uwb_dev_addr *src)
103{
104 struct device *dev = &wlp->rc->uwb_dev.dev;
105 struct wlp_frame_assoc *assoc = (void *) skb->data;
106 struct wlp_session *session = wlp->session;
107 u8 version;
108
109 if (wlp_get_version(wlp, &assoc->version, &version,
110 sizeof(assoc->version)) < 0)
111 goto error;
112 if (version != WLP_VERSION) {
113 dev_err(dev, "Unsupported WLP version in association "
114 "message.\n");
115 goto error;
116 }
117 if (session != NULL) {
118 /* Function that created this session is still holding the
119 * &wlp->mutex to protect this session. */
120 if (assoc->type == session->exp_message ||
121 assoc->type == WLP_ASSOC_F0) {
122 if (!memcmp(&session->neighbor_addr, src,
123 sizeof(*src))) {
124 session->data = skb;
125 (session->cb)(wlp);
126 } else {
127 dev_err(dev, "Received expected message from "
128 "unexpected source. Expected message "
129 "%d or F0 from %02x:%02x, but received "
130 "it from %02x:%02x. Dropping.\n",
131 session->exp_message,
132 session->neighbor_addr.data[1],
133 session->neighbor_addr.data[0],
134 src->data[1], src->data[0]);
135 goto error;
136 }
137 } else {
138 dev_err(dev, "Association already in progress. "
139 "Dropping.\n");
140 goto error;
141 }
142 } else {
143 wlp_direct_assoc_frame(wlp, skb, src);
144 }
145 return;
146error:
147 kfree_skb(skb);
148}
149
150/*
151 * Verify incoming frame is from connected neighbor, prep to pass to WLP client
152 *
153 * Verification proceeds according to WLP 0.99 [7.3.1]. The source address
154 * is used to determine which neighbor is sending the frame and the WSS tag
155 * is used to know to which WSS the frame belongs (we only support one WSS
156 * so this test is straight forward).
157 * With the WSS found we need to ensure that we are connected before
158 * allowing the exchange of data frames.
159 */
160static
161int wlp_verify_prep_rx_frame(struct wlp *wlp, struct sk_buff *skb,
162 struct uwb_dev_addr *src)
163{
164 struct device *dev = &wlp->rc->uwb_dev.dev;
165 int result = -EINVAL;
166 struct wlp_eda_node eda_entry;
167 struct wlp_frame_std_abbrv_hdr *hdr = (void *) skb->data;
168
169 /*verify*/
170 result = wlp_copy_eda_node(&wlp->eda, src, &eda_entry);
171 if (result < 0) {
172 if (printk_ratelimit())
173 dev_err(dev, "WLP: Incoming frame is from unknown "
174 "neighbor %02x:%02x.\n", src->data[1],
175 src->data[0]);
176 goto out;
177 }
178 if (hdr->tag != eda_entry.tag) {
179 if (printk_ratelimit())
180 dev_err(dev, "WLP: Tag of incoming frame from "
181 "%02x:%02x does not match expected tag. "
182 "Received 0x%02x, expected 0x%02x. \n",
183 src->data[1], src->data[0], hdr->tag,
184 eda_entry.tag);
185 result = -EINVAL;
186 goto out;
187 }
188 if (eda_entry.state != WLP_WSS_CONNECTED) {
189 if (printk_ratelimit())
190 dev_err(dev, "WLP: Incoming frame from "
191 "%02x:%02x does is not from connected WSS.\n",
192 src->data[1], src->data[0]);
193 result = -EINVAL;
194 goto out;
195 }
196 /*prep*/
197 skb_pull(skb, sizeof(*hdr));
198out:
199 return result;
200}
201
202/*
203 * Receive a WLP frame from device
204 *
205 * @returns: 1 if calling function should free the skb
206 * 0 if it successfully handled skb and freed it
207 * 0 if error occured, will free skb in this case
208 */
209int wlp_receive_frame(struct device *dev, struct wlp *wlp, struct sk_buff *skb,
210 struct uwb_dev_addr *src)
211{
212 unsigned len = skb->len;
213 void *ptr = skb->data;
214 struct wlp_frame_hdr *hdr;
215 int result = 0;
216
217 if (len < sizeof(*hdr)) {
218 dev_err(dev, "Not enough data to parse WLP header.\n");
219 result = -EINVAL;
220 goto out;
221 }
222 hdr = ptr;
223 if (le16_to_cpu(hdr->mux_hdr) != WLP_PROTOCOL_ID) {
224 dev_err(dev, "Not a WLP frame type.\n");
225 result = -EINVAL;
226 goto out;
227 }
228 switch (hdr->type) {
229 case WLP_FRAME_STANDARD:
230 if (len < sizeof(struct wlp_frame_std_abbrv_hdr)) {
231 dev_err(dev, "Not enough data to parse Standard "
232 "WLP header.\n");
233 goto out;
234 }
235 result = wlp_verify_prep_rx_frame(wlp, skb, src);
236 if (result < 0) {
237 if (printk_ratelimit())
238 dev_err(dev, "WLP: Verification of frame "
239 "from neighbor %02x:%02x failed.\n",
240 src->data[1], src->data[0]);
241 goto out;
242 }
243 result = 1;
244 break;
245 case WLP_FRAME_ABBREVIATED:
246 dev_err(dev, "Abbreviated frame received. FIXME?\n");
247 kfree_skb(skb);
248 break;
249 case WLP_FRAME_CONTROL:
250 dev_err(dev, "Control frame received. FIXME?\n");
251 kfree_skb(skb);
252 break;
253 case WLP_FRAME_ASSOCIATION:
254 if (len < sizeof(struct wlp_frame_assoc)) {
255 dev_err(dev, "Not enough data to parse Association "
256 "WLP header.\n");
257 goto out;
258 }
259 wlp_receive_assoc_frame(wlp, skb, src);
260 break;
261 default:
262 dev_err(dev, "Invalid frame received.\n");
263 result = -EINVAL;
264 break;
265 }
266out:
267 if (result < 0) {
268 kfree_skb(skb);
269 result = 0;
270 }
271 return result;
272}
273EXPORT_SYMBOL_GPL(wlp_receive_frame);
274
275
276/*
277 * Verify frame from network stack, prepare for further transmission
278 *
279 * @skb: the socket buffer that needs to be prepared for transmission (it
280 * is in need of a WLP header). If this is a broadcast frame we take
281 * over the entire transmission.
282 * If it is a unicast the WSS connection should already be established
283 * and transmission will be done by the calling function.
284 * @dst: On return this will contain the device address to which the
285 * frame is destined.
286 * @returns: 0 on success no tx : WLP header successfully applied to skb buffer,
287 * calling function can proceed with tx
288 * 1 on success with tx : WLP will take over transmission of this
289 * frame
290 * <0 on error
291 *
292 * The network stack (WLP client) is attempting to transmit a frame. We can
293 * only transmit data if a local WSS is at least active (connection will be
294 * done here if this is a broadcast frame and neighbor also has the WSS
295 * active).
296 *
297 * The frame can be either broadcast or unicast. Broadcast in a WSS is
298 * supported via multicast, but we don't support multicast yet (until
299 * devices start to support MAB IEs). If a broadcast frame needs to be
300 * transmitted it is treated as a unicast frame to each neighbor. In this
301 * case the WLP takes over transmission of the skb and returns 1
302 * to the caller to indicate so. Also, in this case, if a neighbor has the
303 * same WSS activated but is not connected then the WSS connection will be
304 * done at this time. The neighbor's virtual address will be learned at
305 * this time.
306 *
307 * The destination address in a unicast frame is the virtual address of the
308 * neighbor. This address only becomes known when a WSS connection is
309 * established. We thus rely on a broadcast frame to trigger the setup of
310 * WSS connections to all neighbors before we are able to send unicast
311 * frames to them. This seems reasonable as IP would usually use ARP first
312 * before any unicast frames are sent.
313 *
314 * If we are already connected to the neighbor (neighbor's virtual address
315 * is known) we just prepare the WLP header and the caller will continue to
316 * send the frame.
317 *
318 * A failure in this function usually indicates something that cannot be
319 * fixed automatically. So, if this function fails (@return < 0) the calling
320 * function should not retry to send the frame as it will very likely keep
321 * failing.
322 *
323 */
324int wlp_prepare_tx_frame(struct device *dev, struct wlp *wlp,
325 struct sk_buff *skb, struct uwb_dev_addr *dst)
326{
327 int result = -EINVAL;
328 struct ethhdr *eth_hdr = (void *) skb->data;
329
330 if (is_multicast_ether_addr(eth_hdr->h_dest)) {
331 result = wlp_eda_for_each(&wlp->eda, wlp_wss_send_copy, skb);
332 if (result < 0) {
333 if (printk_ratelimit())
334 dev_err(dev, "Unable to handle broadcast "
335 "frame from WLP client.\n");
336 goto out;
337 }
338 dev_kfree_skb_irq(skb);
339 result = 1;
340 /* Frame will be transmitted by WLP. */
341 } else {
342 result = wlp_eda_for_virtual(&wlp->eda, eth_hdr->h_dest, dst,
343 wlp_wss_prep_hdr, skb);
344 if (unlikely(result < 0)) {
345 if (printk_ratelimit())
346 dev_err(dev, "Unable to prepare "
347 "skb for transmission. \n");
348 goto out;
349 }
350 }
351out:
352 return result;
353}
354EXPORT_SYMBOL_GPL(wlp_prepare_tx_frame);
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-10 11:10:06 -0400