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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/net/ncsi/ncsi-cmd.c
....@@ -1,10 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * 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.
84  */
95 
106 #include <linux/module.h>
....@@ -17,9 +13,12 @@
1713 #include <net/ncsi.h>
1814 #include <net/net_namespace.h>
1915 #include <net/sock.h>
16
+#include <net/genetlink.h>
2017 
2118 #include "internal.h"
2219 #include "ncsi-pkt.h"
20
+
21
+static const int padding_bytes = 26;
2322 
2423 u32 ncsi_calculate_checksum(unsigned char *data, int len)
2524 {
....@@ -57,7 +56,7 @@
5756 	checksum = ncsi_calculate_checksum((unsigned char *)h,
5857 					   sizeof(*h) + nca->payload);
5958 	pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
60
-		    nca->payload);
59
+		    ALIGN(nca->payload, 4));
6160 	*pchecksum = htonl(checksum);
6261 }
6362 
....@@ -211,6 +210,30 @@
211210 	return 0;
212211 }
213212 
213
+static int ncsi_cmd_handler_oem(struct sk_buff *skb,
214
+				struct ncsi_cmd_arg *nca)
215
+{
216
+	struct ncsi_cmd_oem_pkt *cmd;
217
+	unsigned int len;
218
+	int payload;
219
+	/* NC-SI spec DSP_0222_1.2.0, section 8.2.2.2
220
+	 * requires payload to be padded with 0 to
221
+	 * 32-bit boundary before the checksum field.
222
+	 * Ensure the padding bytes are accounted for in
223
+	 * skb allocation
224
+	 */
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+
226
+	payload = ALIGN(nca->payload, 4);
227
+	len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
228
+	len += max(payload, padding_bytes);
229
+
230
+	cmd = skb_put_zero(skb, len);
231
+	memcpy(&cmd->mfr_id, nca->data, nca->payload);
232
+	ncsi_cmd_build_header(&cmd->cmd.common, nca);
233
+
234
+	return 0;
235
+}
236
+
214237 static struct ncsi_cmd_handler {
215238 	unsigned char type;
216239 	int           payload;
....@@ -244,7 +267,7 @@
244267 	{ NCSI_PKT_CMD_GNS,    0, ncsi_cmd_handler_default },
245268 	{ NCSI_PKT_CMD_GNPTS,  0, ncsi_cmd_handler_default },
246269 	{ NCSI_PKT_CMD_GPS,    0, ncsi_cmd_handler_default },
247
-	{ NCSI_PKT_CMD_OEM,    0, NULL                     },
270
+	{ NCSI_PKT_CMD_OEM,   -1, ncsi_cmd_handler_oem     },
248271 	{ NCSI_PKT_CMD_PLDM,   0, NULL                     },
249272 	{ NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
250273 };
....@@ -256,6 +279,7 @@
256279 	struct net_device *dev = nd->dev;
257280 	int hlen = LL_RESERVED_SPACE(dev);
258281 	int tlen = dev->needed_tailroom;
282
+	int payload;
259283 	int len = hlen + tlen;
260284 	struct sk_buff *skb;
261285 	struct ncsi_request *nr;
....@@ -265,14 +289,14 @@
265289 		return NULL;
266290 
267291 	/* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
292
+	 * Payload needs padding so that the checksum field following payload is
293
+	 * aligned to 32-bit boundary.
268294 	 * The packet needs padding if its payload is less than 26 bytes to
269295 	 * meet 64 bytes minimal ethernet frame length.
270296 	 */
271297 	len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
272
-	if (nca->payload < 26)
273
-		len += 26;
274
-	else
275
-		len += nca->payload;
298
+	payload = ALIGN(nca->payload, 4);
299
+	len += max(payload, padding_bytes);
276300 
277301 	/* Allocate skb */
278302 	skb = alloc_skb(len, GFP_ATOMIC);
....@@ -293,14 +317,21 @@
293317 
294318 int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
295319 {
296
-	struct ncsi_request *nr;
297
-	struct ethhdr *eh;
298320 	struct ncsi_cmd_handler *nch = NULL;
321
+	struct ncsi_request *nr;
322
+	unsigned char type;
323
+	struct ethhdr *eh;
299324 	int i, ret;
325
+
326
+	/* Use OEM generic handler for Netlink request */
327
+	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN)
328
+		type = NCSI_PKT_CMD_OEM;
329
+	else
330
+		type = nca->type;
300331 
301332 	/* Search for the handler */
302333 	for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
303
-		if (ncsi_cmd_handlers[i].type == nca->type) {
334
+		if (ncsi_cmd_handlers[i].type == type) {
304335 			if (ncsi_cmd_handlers[i].handler)
305336 				nch = &ncsi_cmd_handlers[i];
306337 			else
....@@ -316,11 +347,23 @@
316347 		return -ENOENT;
317348 	}
318349 
319
-	/* Get packet payload length and allocate the request */
320
-	nca->payload = nch->payload;
350
+	/* Get packet payload length and allocate the request
351
+	 * It is expected that if length set as negative in
352
+	 * handler structure means caller is initializing it
353
+	 * and setting length in nca before calling xmit function
354
+	 */
355
+	if (nch->payload >= 0)
356
+		nca->payload = nch->payload;
321357 	nr = ncsi_alloc_command(nca);
322358 	if (!nr)
323359 		return -ENOMEM;
360
+
361
+	/* track netlink information */
362
+	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
363
+		nr->snd_seq = nca->info->snd_seq;
364
+		nr->snd_portid = nca->info->snd_portid;
365
+		nr->nlhdr = *nca->info->nlhdr;
366
+	}
324367 
325368 	/* Prepare the packet */
326369 	nca->id = nr->id;
....@@ -334,7 +377,15 @@
334377 	eh = skb_push(nr->cmd, sizeof(*eh));
335378 	eh->h_proto = htons(ETH_P_NCSI);
336379 	eth_broadcast_addr(eh->h_dest);
337
-	eth_broadcast_addr(eh->h_source);
380
+
381
+	/* If mac address received from device then use it for
382
+	 * source address as unicast address else use broadcast
383
+	 * address as source address
384
+	 */
385
+	if (nca->ndp->gma_flag == 1)
386
+		memcpy(eh->h_source, nca->ndp->ndev.dev->dev_addr, ETH_ALEN);
387
+	else
388
+		eth_broadcast_addr(eh->h_source);
338389 
339390 	/* Start the timer for the request that might not have
340391 	 * corresponding response. Given NCSI is an internal