blob: db7083bfd47691fae726d5682ec518986ab49468 [file] [log] [blame]
Gavin Shan6389eaa2016-07-19 11:54:17 +10001/*
2 * Copyright Gavin Shan, IBM Corporation 2016.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/etherdevice.h>
14#include <linux/netdevice.h>
15#include <linux/skbuff.h>
16
17#include <net/ncsi.h>
18#include <net/net_namespace.h>
19#include <net/sock.h>
20
21#include "internal.h"
22#include "ncsi-pkt.h"
23
24u32 ncsi_calculate_checksum(unsigned char *data, int len)
25{
26 u32 checksum = 0;
27 int i;
28
29 for (i = 0; i < len; i += 2)
30 checksum += (((u32)data[i] << 8) | data[i + 1]);
31
32 checksum = (~checksum + 1);
33 return checksum;
34}
35
36/* This function should be called after the data area has been
37 * populated completely.
38 */
39static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
40 struct ncsi_cmd_arg *nca)
41{
42 u32 checksum;
43 __be32 *pchecksum;
44
45 h->mc_id = 0;
46 h->revision = NCSI_PKT_REVISION;
47 h->reserved = 0;
48 h->id = nca->id;
49 h->type = nca->type;
50 h->channel = NCSI_TO_CHANNEL(nca->package,
51 nca->channel);
52 h->length = htons(nca->payload);
53 h->reserved1[0] = 0;
54 h->reserved1[1] = 0;
55
56 /* Fill with calculated checksum */
57 checksum = ncsi_calculate_checksum((unsigned char *)h,
58 sizeof(*h) + nca->payload);
59 pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
60 nca->payload);
61 *pchecksum = htonl(checksum);
62}
63
64static int ncsi_cmd_handler_default(struct sk_buff *skb,
65 struct ncsi_cmd_arg *nca)
66{
67 struct ncsi_cmd_pkt *cmd;
68
69 cmd = (struct ncsi_cmd_pkt *)skb_put(skb, sizeof(*cmd));
70 memset(cmd, 0, sizeof(*cmd));
71 ncsi_cmd_build_header(&cmd->cmd.common, nca);
72
73 return 0;
74}
75
76static int ncsi_cmd_handler_sp(struct sk_buff *skb,
77 struct ncsi_cmd_arg *nca)
78{
79 struct ncsi_cmd_sp_pkt *cmd;
80
81 cmd = (struct ncsi_cmd_sp_pkt *)skb_put(skb, sizeof(*cmd));
82 memset(cmd, 0, sizeof(*cmd));
83 cmd->hw_arbitration = nca->bytes[0];
84 ncsi_cmd_build_header(&cmd->cmd.common, nca);
85
86 return 0;
87}
88
89static int ncsi_cmd_handler_dc(struct sk_buff *skb,
90 struct ncsi_cmd_arg *nca)
91{
92 struct ncsi_cmd_dc_pkt *cmd;
93
94 cmd = (struct ncsi_cmd_dc_pkt *)skb_put(skb, sizeof(*cmd));
95 memset(cmd, 0, sizeof(*cmd));
96 cmd->ald = nca->bytes[0];
97 ncsi_cmd_build_header(&cmd->cmd.common, nca);
98
99 return 0;
100}
101
102static int ncsi_cmd_handler_rc(struct sk_buff *skb,
103 struct ncsi_cmd_arg *nca)
104{
105 struct ncsi_cmd_rc_pkt *cmd;
106
107 cmd = (struct ncsi_cmd_rc_pkt *)skb_put(skb, sizeof(*cmd));
108 memset(cmd, 0, sizeof(*cmd));
109 ncsi_cmd_build_header(&cmd->cmd.common, nca);
110
111 return 0;
112}
113
114static int ncsi_cmd_handler_ae(struct sk_buff *skb,
115 struct ncsi_cmd_arg *nca)
116{
117 struct ncsi_cmd_ae_pkt *cmd;
118
119 cmd = (struct ncsi_cmd_ae_pkt *)skb_put(skb, sizeof(*cmd));
120 memset(cmd, 0, sizeof(*cmd));
121 cmd->mc_id = nca->bytes[0];
122 cmd->mode = htonl(nca->dwords[1]);
123 ncsi_cmd_build_header(&cmd->cmd.common, nca);
124
125 return 0;
126}
127
128static int ncsi_cmd_handler_sl(struct sk_buff *skb,
129 struct ncsi_cmd_arg *nca)
130{
131 struct ncsi_cmd_sl_pkt *cmd;
132
133 cmd = (struct ncsi_cmd_sl_pkt *)skb_put(skb, sizeof(*cmd));
134 memset(cmd, 0, sizeof(*cmd));
135 cmd->mode = htonl(nca->dwords[0]);
136 cmd->oem_mode = htonl(nca->dwords[1]);
137 ncsi_cmd_build_header(&cmd->cmd.common, nca);
138
139 return 0;
140}
141
142static int ncsi_cmd_handler_svf(struct sk_buff *skb,
143 struct ncsi_cmd_arg *nca)
144{
145 struct ncsi_cmd_svf_pkt *cmd;
146
147 cmd = (struct ncsi_cmd_svf_pkt *)skb_put(skb, sizeof(*cmd));
148 memset(cmd, 0, sizeof(*cmd));
149 cmd->vlan = htons(nca->words[0]);
150 cmd->index = nca->bytes[2];
151 cmd->enable = nca->bytes[3];
152 ncsi_cmd_build_header(&cmd->cmd.common, nca);
153
154 return 0;
155}
156
157static int ncsi_cmd_handler_ev(struct sk_buff *skb,
158 struct ncsi_cmd_arg *nca)
159{
160 struct ncsi_cmd_ev_pkt *cmd;
161
162 cmd = (struct ncsi_cmd_ev_pkt *)skb_put(skb, sizeof(*cmd));
163 memset(cmd, 0, sizeof(*cmd));
164 cmd->mode = nca->bytes[0];
165 ncsi_cmd_build_header(&cmd->cmd.common, nca);
166
167 return 0;
168}
169
170static int ncsi_cmd_handler_sma(struct sk_buff *skb,
171 struct ncsi_cmd_arg *nca)
172{
173 struct ncsi_cmd_sma_pkt *cmd;
174 int i;
175
176 cmd = (struct ncsi_cmd_sma_pkt *)skb_put(skb, sizeof(*cmd));
177 memset(cmd, 0, sizeof(*cmd));
178 for (i = 0; i < 6; i++)
179 cmd->mac[i] = nca->bytes[i];
180 cmd->index = nca->bytes[6];
181 cmd->at_e = nca->bytes[7];
182 ncsi_cmd_build_header(&cmd->cmd.common, nca);
183
184 return 0;
185}
186
187static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
188 struct ncsi_cmd_arg *nca)
189{
190 struct ncsi_cmd_ebf_pkt *cmd;
191
192 cmd = (struct ncsi_cmd_ebf_pkt *)skb_put(skb, sizeof(*cmd));
193 memset(cmd, 0, sizeof(*cmd));
194 cmd->mode = htonl(nca->dwords[0]);
195 ncsi_cmd_build_header(&cmd->cmd.common, nca);
196
197 return 0;
198}
199
200static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
201 struct ncsi_cmd_arg *nca)
202{
203 struct ncsi_cmd_egmf_pkt *cmd;
204
205 cmd = (struct ncsi_cmd_egmf_pkt *)skb_put(skb, sizeof(*cmd));
206 memset(cmd, 0, sizeof(*cmd));
207 cmd->mode = htonl(nca->dwords[0]);
208 ncsi_cmd_build_header(&cmd->cmd.common, nca);
209
210 return 0;
211}
212
213static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
214 struct ncsi_cmd_arg *nca)
215{
216 struct ncsi_cmd_snfc_pkt *cmd;
217
218 cmd = (struct ncsi_cmd_snfc_pkt *)skb_put(skb, sizeof(*cmd));
219 memset(cmd, 0, sizeof(*cmd));
220 cmd->mode = nca->bytes[0];
221 ncsi_cmd_build_header(&cmd->cmd.common, nca);
222
223 return 0;
224}
225
226static struct ncsi_cmd_handler {
227 unsigned char type;
228 int payload;
229 int (*handler)(struct sk_buff *skb,
230 struct ncsi_cmd_arg *nca);
231} ncsi_cmd_handlers[] = {
232 { NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
233 { NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
234 { NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
235 { NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
236 { NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
237 { NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
238 { NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
239 { NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
240 { NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
241 { NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
242 { NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
243 { NCSI_PKT_CMD_SVF, 4, ncsi_cmd_handler_svf },
244 { NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
245 { NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
246 { NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
247 { NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
248 { NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
249 { NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
250 { NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
251 { NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
252 { NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
253 { NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
254 { NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
255 { NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
256 { NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
257 { NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
258 { NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
259 { NCSI_PKT_CMD_OEM, 0, NULL },
260 { NCSI_PKT_CMD_PLDM, 0, NULL },
261 { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
262};
263
264static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
265{
266 struct ncsi_dev_priv *ndp = nca->ndp;
267 struct ncsi_dev *nd = &ndp->ndev;
268 struct net_device *dev = nd->dev;
269 int hlen = LL_RESERVED_SPACE(dev);
270 int tlen = dev->needed_tailroom;
271 int len = hlen + tlen;
272 struct sk_buff *skb;
273 struct ncsi_request *nr;
274
Gavin Shana0509cb2016-10-04 11:25:51 +1100275 nr = ncsi_alloc_request(ndp, nca->req_flags);
Gavin Shan6389eaa2016-07-19 11:54:17 +1000276 if (!nr)
277 return NULL;
278
279 /* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
280 * The packet needs padding if its payload is less than 26 bytes to
281 * meet 64 bytes minimal ethernet frame length.
282 */
283 len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
284 if (nca->payload < 26)
285 len += 26;
286 else
287 len += nca->payload;
288
289 /* Allocate skb */
290 skb = alloc_skb(len, GFP_ATOMIC);
291 if (!skb) {
292 ncsi_free_request(nr);
293 return NULL;
294 }
295
296 nr->cmd = skb;
297 skb_reserve(skb, hlen);
298 skb_reset_network_header(skb);
299
300 skb->dev = dev;
301 skb->protocol = htons(ETH_P_NCSI);
302
303 return nr;
304}
305
306int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
307{
308 struct ncsi_request *nr;
309 struct ethhdr *eh;
310 struct ncsi_cmd_handler *nch = NULL;
311 int i, ret;
312
313 /* Search for the handler */
314 for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
315 if (ncsi_cmd_handlers[i].type == nca->type) {
316 if (ncsi_cmd_handlers[i].handler)
317 nch = &ncsi_cmd_handlers[i];
318 else
319 nch = NULL;
320
321 break;
322 }
323 }
324
325 if (!nch) {
326 netdev_err(nca->ndp->ndev.dev,
327 "Cannot send packet with type 0x%02x\n", nca->type);
328 return -ENOENT;
329 }
330
331 /* Get packet payload length and allocate the request */
332 nca->payload = nch->payload;
333 nr = ncsi_alloc_command(nca);
334 if (!nr)
335 return -ENOMEM;
336
337 /* Prepare the packet */
338 nca->id = nr->id;
339 ret = nch->handler(nr->cmd, nca);
340 if (ret) {
341 ncsi_free_request(nr);
342 return ret;
343 }
344
345 /* Fill the ethernet header */
346 eh = (struct ethhdr *)skb_push(nr->cmd, sizeof(*eh));
347 eh->h_proto = htons(ETH_P_NCSI);
348 eth_broadcast_addr(eh->h_dest);
349 eth_broadcast_addr(eh->h_source);
350
351 /* Start the timer for the request that might not have
352 * corresponding response. Given NCSI is an internal
353 * connection a 1 second delay should be sufficient.
354 */
355 nr->enabled = true;
356 mod_timer(&nr->timer, jiffies + 1 * HZ);
357
358 /* Send NCSI packet */
359 skb_get(nr->cmd);
360 ret = dev_queue_xmit(nr->cmd);
361 if (ret < 0) {
362 ncsi_free_request(nr);
363 return ret;
364 }
365
366 return 0;
367}