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Linux/net/ncsi/ncsi-cmd.c

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  1 /*
  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 
 24 u32 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  */
 39 static 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 
 64 static 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 
 76 static 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 
 89 static 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 
102 static 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 
114 static 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 
128 static 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 
142 static 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 
157 static 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 
170 static 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 
187 static 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 
200 static 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 
213 static 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 
226 static 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 
264 static 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 
275         nr = ncsi_alloc_request(ndp, nca->req_flags);
276         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 
306 int 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 }
368 

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