[deliverable/linux.git] / net / ncsi / ncsi-cmd.c

/*
 * Copyright Gavin Shan, IBM Corporation 2016.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>

#include <net/ncsi.h>
#include <net/net_namespace.h>
#include <net/sock.h>

#include "internal.h"
#include "ncsi-pkt.h"

u32 ncsi_calculate_checksum(unsigned char *data, int len)
{
	u32 checksum = 0;
	int i;

	for (i = 0; i < len; i += 2)
		checksum += (((u32)data[i] << 8) | data[i + 1]);

	checksum = (~checksum + 1);
	return checksum;
}

/* This function should be called after the data area has been
 * populated completely.
 */
static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
				  struct ncsi_cmd_arg *nca)
{
	u32 checksum;
	__be32 *pchecksum;

	h->mc_id        = 0;
	h->revision     = NCSI_PKT_REVISION;
	h->reserved     = 0;
	h->id           = nca->id;
	h->type         = nca->type;
	h->channel      = NCSI_TO_CHANNEL(nca->package,
					  nca->channel);
	h->length       = htons(nca->payload);
	h->reserved1[0] = 0;
	h->reserved1[1] = 0;

	/* Fill with calculated checksum */
	checksum = ncsi_calculate_checksum((unsigned char *)h,
					   sizeof(*h) + nca->payload);
	pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
		    nca->payload);
	*pchecksum = htonl(checksum);
}

static int ncsi_cmd_handler_default(struct sk_buff *skb,
				    struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_pkt *cmd;

	cmd = (struct ncsi_cmd_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_sp(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_sp_pkt *cmd;

	cmd = (struct ncsi_cmd_sp_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->hw_arbitration = nca->bytes[0];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_dc(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_dc_pkt *cmd;

	cmd = (struct ncsi_cmd_dc_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->ald = nca->bytes[0];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_rc(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_rc_pkt *cmd;

	cmd = (struct ncsi_cmd_rc_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_ae(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_ae_pkt *cmd;

	cmd = (struct ncsi_cmd_ae_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mc_id = nca->bytes[0];
	cmd->mode = htonl(nca->dwords[1]);
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_sl(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_sl_pkt *cmd;

	cmd = (struct ncsi_cmd_sl_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mode = htonl(nca->dwords[0]);
	cmd->oem_mode = htonl(nca->dwords[1]);
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_svf(struct sk_buff *skb,
				struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_svf_pkt *cmd;

	cmd = (struct ncsi_cmd_svf_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->vlan = htons(nca->words[0]);
	cmd->index = nca->bytes[2];
	cmd->enable = nca->bytes[3];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_ev(struct sk_buff *skb,
			       struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_ev_pkt *cmd;

	cmd = (struct ncsi_cmd_ev_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mode = nca->bytes[0];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_sma(struct sk_buff *skb,
				struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_sma_pkt *cmd;
	int i;

	cmd = (struct ncsi_cmd_sma_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	for (i = 0; i < 6; i++)
		cmd->mac[i] = nca->bytes[i];
	cmd->index = nca->bytes[6];
	cmd->at_e = nca->bytes[7];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
				struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_ebf_pkt *cmd;

	cmd = (struct ncsi_cmd_ebf_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mode = htonl(nca->dwords[0]);
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
				 struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_egmf_pkt *cmd;

	cmd = (struct ncsi_cmd_egmf_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mode = htonl(nca->dwords[0]);
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
				 struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_snfc_pkt *cmd;

	cmd = (struct ncsi_cmd_snfc_pkt *)skb_put(skb, sizeof(*cmd));
	memset(cmd, 0, sizeof(*cmd));
	cmd->mode = nca->bytes[0];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static struct ncsi_cmd_handler {
	unsigned char type;
	int           payload;
	int           (*handler)(struct sk_buff *skb,
				 struct ncsi_cmd_arg *nca);
} ncsi_cmd_handlers[] = {
	{ NCSI_PKT_CMD_CIS,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_SP,     4, ncsi_cmd_handler_sp      },
	{ NCSI_PKT_CMD_DP,     0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_EC,     0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_DC,     4, ncsi_cmd_handler_dc      },
	{ NCSI_PKT_CMD_RC,     4, ncsi_cmd_handler_rc      },
	{ NCSI_PKT_CMD_ECNT,   0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_DCNT,   0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_AE,     8, ncsi_cmd_handler_ae      },
	{ NCSI_PKT_CMD_SL,     8, ncsi_cmd_handler_sl      },
	{ NCSI_PKT_CMD_GLS,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_SVF,    4, ncsi_cmd_handler_svf     },
	{ NCSI_PKT_CMD_EV,     4, ncsi_cmd_handler_ev      },
	{ NCSI_PKT_CMD_DV,     0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_SMA,    8, ncsi_cmd_handler_sma     },
	{ NCSI_PKT_CMD_EBF,    4, ncsi_cmd_handler_ebf     },
	{ NCSI_PKT_CMD_DBF,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_EGMF,   4, ncsi_cmd_handler_egmf    },
	{ NCSI_PKT_CMD_DGMF,   0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_SNFC,   4, ncsi_cmd_handler_snfc    },
	{ NCSI_PKT_CMD_GVI,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GC,     0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GP,     0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GCPS,   0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GNS,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GNPTS,  0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_GPS,    0, ncsi_cmd_handler_default },
	{ NCSI_PKT_CMD_OEM,    0, NULL                     },
	{ NCSI_PKT_CMD_PLDM,   0, NULL                     },
	{ NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
};

static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
{
	struct ncsi_dev_priv *ndp = nca->ndp;
	struct ncsi_dev *nd = &ndp->ndev;
	struct net_device *dev = nd->dev;
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;
	int len = hlen + tlen;
	struct sk_buff *skb;
	struct ncsi_request *nr;

	nr = ncsi_alloc_request(ndp, nca->driven);
	if (!nr)
		return NULL;

	/* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
	 * The packet needs padding if its payload is less than 26 bytes to
	 * meet 64 bytes minimal ethernet frame length.
	 */
	len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	if (nca->payload < 26)
		len += 26;
	else
		len += nca->payload;

	/* Allocate skb */
	skb = alloc_skb(len, GFP_ATOMIC);
	if (!skb) {
		ncsi_free_request(nr);
		return NULL;
	}

	nr->cmd = skb;
	skb_reserve(skb, hlen);
	skb_reset_network_header(skb);

	skb->dev = dev;
	skb->protocol = htons(ETH_P_NCSI);

	return nr;
}

int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
{
	struct ncsi_request *nr;
	struct ethhdr *eh;
	struct ncsi_cmd_handler *nch = NULL;
	int i, ret;

	/* Search for the handler */
	for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
		if (ncsi_cmd_handlers[i].type == nca->type) {
			if (ncsi_cmd_handlers[i].handler)
				nch = &ncsi_cmd_handlers[i];
			else
				nch = NULL;

			break;
		}
	}

	if (!nch) {
		netdev_err(nca->ndp->ndev.dev,
			   "Cannot send packet with type 0x%02x\n", nca->type);
		return -ENOENT;
	}

	/* Get packet payload length and allocate the request */
	nca->payload = nch->payload;
	nr = ncsi_alloc_command(nca);
	if (!nr)
		return -ENOMEM;

	/* Prepare the packet */
	nca->id = nr->id;
	ret = nch->handler(nr->cmd, nca);
	if (ret) {
		ncsi_free_request(nr);
		return ret;
	}

	/* Fill the ethernet header */
	eh = (struct ethhdr *)skb_push(nr->cmd, sizeof(*eh));
	eh->h_proto = htons(ETH_P_NCSI);
	eth_broadcast_addr(eh->h_dest);
	eth_broadcast_addr(eh->h_source);

	/* Start the timer for the request that might not have
	 * corresponding response. Given NCSI is an internal
	 * connection a 1 second delay should be sufficient.
	 */
	nr->enabled = true;
	mod_timer(&nr->timer, jiffies + 1 * HZ);

	/* Send NCSI packet */
	skb_get(nr->cmd);
	ret = dev_queue_xmit(nr->cmd);
	if (ret < 0) {
		ncsi_free_request(nr);
		return ret;
	}

	return 0;
}
Commit	Line	Data
6389eaa7 GS	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->driven);
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	}