[linux-2.6-block.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 <net/genetlink.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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, sizeof(*cmd));
	cmd->vlan = htons(nca->words[1]);
	cmd->index = nca->bytes[6];
	cmd->enable = nca->bytes[7];
	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 = skb_put_zero(skb, sizeof(*cmd));
	cmd->mode = nca->bytes[3];
	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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, sizeof(*cmd));
	cmd->mode = nca->bytes[0];
	ncsi_cmd_build_header(&cmd->cmd.common, nca);

	return 0;
}

static int ncsi_cmd_handler_oem(struct sk_buff *skb,
				struct ncsi_cmd_arg *nca)
{
	struct ncsi_cmd_oem_pkt *cmd;
	unsigned int len;

	len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	if (nca->payload < 26)
		len += 26;
	else
		len += nca->payload;

	cmd = skb_put_zero(skb, len);
	memcpy(&cmd->mfr_id, nca->data, nca->payload);
	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,    8, 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,   -1, ncsi_cmd_handler_oem     },
	{ 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->req_flags);
	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
	 * It is expected that if length set as negative in
	 * handler structure means caller is initializing it
	 * and setting length in nca before calling xmit function
	 */
	if (nch->payload >= 0)
		nca->payload = nch->payload;
	nr = ncsi_alloc_command(nca);
	if (!nr)
		return -ENOMEM;

	/* track netlink information */
	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
		nr->snd_seq = nca->info->snd_seq;
		nr->snd_portid = nca->info->snd_portid;
		nr->nlhdr = *nca->info->nlhdr;
	}

	/* 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 = 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>
9771b8cc	20	#include <net/genetlink.h>
6389eaa7 GS	21
	22	#include "internal.h"
	23	#include "ncsi-pkt.h"
	24
	25	u32 ncsi_calculate_checksum(unsigned char *data, int len)
	26	{
	27	u32 checksum = 0;
	28	int i;
	29
	30	for (i = 0; i < len; i += 2)
	31	checksum += (((u32)data[i] << 8) \| data[i + 1]);
	32
	33	checksum = (~checksum + 1);
	34	return checksum;
	35	}
	36
	37	/* This function should be called after the data area has been
	38	* populated completely.
	39	*/
	40	static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
	41	struct ncsi_cmd_arg *nca)
	42	{
	43	u32 checksum;
	44	__be32 *pchecksum;
	45
	46	h->mc_id = 0;
	47	h->revision = NCSI_PKT_REVISION;
	48	h->reserved = 0;
	49	h->id = nca->id;
	50	h->type = nca->type;
	51	h->channel = NCSI_TO_CHANNEL(nca->package,
	52	nca->channel);
	53	h->length = htons(nca->payload);
	54	h->reserved1[0] = 0;
	55	h->reserved1[1] = 0;
	56
	57	/* Fill with calculated checksum */
	58	checksum = ncsi_calculate_checksum((unsigned char *)h,
	59	sizeof(*h) + nca->payload);
	60	pchecksum = (__be32 )((void )h + sizeof(struct ncsi_pkt_hdr) +
	61	nca->payload);
	62	*pchecksum = htonl(checksum);
	63	}
	64
	65	static int ncsi_cmd_handler_default(struct sk_buff *skb,
	66	struct ncsi_cmd_arg *nca)
	67	{
	68	struct ncsi_cmd_pkt *cmd;
	69
b080db58	70	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	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
b080db58	81	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	82	cmd->hw_arbitration = nca->bytes[0];
	83	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	84
	85	return 0;
	86	}
	87
	88	static int ncsi_cmd_handler_dc(struct sk_buff *skb,
	89	struct ncsi_cmd_arg *nca)
	90	{
	91	struct ncsi_cmd_dc_pkt *cmd;
	92
b080db58	93	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	94	cmd->ald = nca->bytes[0];
	95	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	96
	97	return 0;
	98	}
	99
	100	static int ncsi_cmd_handler_rc(struct sk_buff *skb,
	101	struct ncsi_cmd_arg *nca)
	102	{
	103	struct ncsi_cmd_rc_pkt *cmd;
	104
b080db58	105	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	106	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	107
	108	return 0;
	109	}
	110
	111	static int ncsi_cmd_handler_ae(struct sk_buff *skb,
	112	struct ncsi_cmd_arg *nca)
	113	{
	114	struct ncsi_cmd_ae_pkt *cmd;
	115
b080db58	116	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	117	cmd->mc_id = nca->bytes[0];
	118	cmd->mode = htonl(nca->dwords[1]);
	119	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	120
	121	return 0;
	122	}
	123
	124	static int ncsi_cmd_handler_sl(struct sk_buff *skb,
	125	struct ncsi_cmd_arg *nca)
	126	{
	127	struct ncsi_cmd_sl_pkt *cmd;
	128
b080db58	129	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	130	cmd->mode = htonl(nca->dwords[0]);
	131	cmd->oem_mode = htonl(nca->dwords[1]);
	132	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	133
	134	return 0;
	135	}
	136
	137	static int ncsi_cmd_handler_svf(struct sk_buff *skb,
	138	struct ncsi_cmd_arg *nca)
	139	{
	140	struct ncsi_cmd_svf_pkt *cmd;
	141
b080db58	142	cmd = skb_put_zero(skb, sizeof(*cmd));
8579a67e SMJ	143	cmd->vlan = htons(nca->words[1]);
	144	cmd->index = nca->bytes[6];
	145	cmd->enable = nca->bytes[7];
6389eaa7 GS	146	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	147
	148	return 0;
	149	}
	150
	151	static int ncsi_cmd_handler_ev(struct sk_buff *skb,
	152	struct ncsi_cmd_arg *nca)
	153	{
	154	struct ncsi_cmd_ev_pkt *cmd;
	155
b080db58	156	cmd = skb_put_zero(skb, sizeof(*cmd));
8579a67e	157	cmd->mode = nca->bytes[3];
6389eaa7 GS	158	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	159
	160	return 0;
	161	}
	162
	163	static int ncsi_cmd_handler_sma(struct sk_buff *skb,
	164	struct ncsi_cmd_arg *nca)
	165	{
	166	struct ncsi_cmd_sma_pkt *cmd;
	167	int i;
	168
b080db58	169	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	170	for (i = 0; i < 6; i++)
	171	cmd->mac[i] = nca->bytes[i];
	172	cmd->index = nca->bytes[6];
	173	cmd->at_e = nca->bytes[7];
	174	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	175
	176	return 0;
	177	}
	178
	179	static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
	180	struct ncsi_cmd_arg *nca)
	181	{
	182	struct ncsi_cmd_ebf_pkt *cmd;
	183
b080db58	184	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	185	cmd->mode = htonl(nca->dwords[0]);
	186	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	187
	188	return 0;
	189	}
	190
	191	static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
	192	struct ncsi_cmd_arg *nca)
	193	{
	194	struct ncsi_cmd_egmf_pkt *cmd;
	195
b080db58	196	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	197	cmd->mode = htonl(nca->dwords[0]);
	198	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	199
	200	return 0;
	201	}
	202
	203	static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
	204	struct ncsi_cmd_arg *nca)
	205	{
	206	struct ncsi_cmd_snfc_pkt *cmd;
	207
b080db58	208	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	209	cmd->mode = nca->bytes[0];
	210	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	211
	212	return 0;
	213	}
	214
fb4ee675 VK	215	static int ncsi_cmd_handler_oem(struct sk_buff *skb,
	216	struct ncsi_cmd_arg *nca)
	217	{
	218	struct ncsi_cmd_oem_pkt *cmd;
	219	unsigned int len;
	220
	221	len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	222	if (nca->payload < 26)
	223	len += 26;
	224	else
	225	len += nca->payload;
	226
	227	cmd = skb_put_zero(skb, len);
	228	memcpy(&cmd->mfr_id, nca->data, nca->payload);
	229	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	230
	231	return 0;
	232	}
	233
6389eaa7 GS	234	static struct ncsi_cmd_handler {
	235	unsigned char type;
	236	int payload;
	237	int (handler)(struct sk_buff skb,
	238	struct ncsi_cmd_arg *nca);
	239	} ncsi_cmd_handlers[] = {
	240	{ NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
	241	{ NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
	242	{ NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
	243	{ NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
	244	{ NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
	245	{ NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
	246	{ NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
	247	{ NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
	248	{ NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
	249	{ NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
	250	{ NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
8579a67e	251	{ NCSI_PKT_CMD_SVF, 8, ncsi_cmd_handler_svf },
6389eaa7 GS	252	{ NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
	253	{ NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
	254	{ NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
	255	{ NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
	256	{ NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
	257	{ NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
	258	{ NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
	259	{ NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
	260	{ NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
	261	{ NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
	262	{ NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
	263	{ NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
	264	{ NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
	265	{ NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
	266	{ NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
fb4ee675	267	{ NCSI_PKT_CMD_OEM, -1, ncsi_cmd_handler_oem },
6389eaa7 GS	268	{ NCSI_PKT_CMD_PLDM, 0, NULL },
	269	{ NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
	270	};
	271
	272	static struct ncsi_request ncsi_alloc_command(struct ncsi_cmd_arg nca)
	273	{
	274	struct ncsi_dev_priv *ndp = nca->ndp;
	275	struct ncsi_dev *nd = &ndp->ndev;
	276	struct net_device *dev = nd->dev;
	277	int hlen = LL_RESERVED_SPACE(dev);
	278	int tlen = dev->needed_tailroom;
	279	int len = hlen + tlen;
	280	struct sk_buff *skb;
	281	struct ncsi_request *nr;
	282
a0509cbe	283	nr = ncsi_alloc_request(ndp, nca->req_flags);
6389eaa7 GS	284	if (!nr)
	285	return NULL;
	286
	287	/* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
	288	* The packet needs padding if its payload is less than 26 bytes to
	289	* meet 64 bytes minimal ethernet frame length.
	290	*/
	291	len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	292	if (nca->payload < 26)
	293	len += 26;
	294	else
	295	len += nca->payload;
	296
	297	/* Allocate skb */
	298	skb = alloc_skb(len, GFP_ATOMIC);
	299	if (!skb) {
	300	ncsi_free_request(nr);
	301	return NULL;
	302	}
	303
	304	nr->cmd = skb;
	305	skb_reserve(skb, hlen);
	306	skb_reset_network_header(skb);
	307
	308	skb->dev = dev;
	309	skb->protocol = htons(ETH_P_NCSI);
	310
	311	return nr;
	312	}
	313
	314	int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
	315	{
	316	struct ncsi_request *nr;
	317	struct ethhdr *eh;
	318	struct ncsi_cmd_handler *nch = NULL;
	319	int i, ret;
	320
	321	/* Search for the handler */
	322	for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
	323	if (ncsi_cmd_handlers[i].type == nca->type) {
	324	if (ncsi_cmd_handlers[i].handler)
	325	nch = &ncsi_cmd_handlers[i];
	326	else
	327	nch = NULL;
	328
	329	break;
	330	}
	331	}
	332
	333	if (!nch) {
	334	netdev_err(nca->ndp->ndev.dev,
	335	"Cannot send packet with type 0x%02x\n", nca->type);
	336	return -ENOENT;
	337	}
	338
fb4ee675 VK	339	/* Get packet payload length and allocate the request
	340	* It is expected that if length set as negative in
	341	* handler structure means caller is initializing it
	342	* and setting length in nca before calling xmit function
	343	*/
	344	if (nch->payload >= 0)
	345	nca->payload = nch->payload;
6389eaa7 GS	346	nr = ncsi_alloc_command(nca);
	347	if (!nr)
	348	return -ENOMEM;
	349
9771b8cc JLD	350	/* track netlink information */
	351	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
	352	nr->snd_seq = nca->info->snd_seq;
	353	nr->snd_portid = nca->info->snd_portid;
	354	nr->nlhdr = *nca->info->nlhdr;
	355	}
	356
6389eaa7 GS	357	/* Prepare the packet */
	358	nca->id = nr->id;
	359	ret = nch->handler(nr->cmd, nca);
	360	if (ret) {
	361	ncsi_free_request(nr);
	362	return ret;
	363	}
	364
	365	/* Fill the ethernet header */
d58ff351	366	eh = skb_push(nr->cmd, sizeof(*eh));
6389eaa7 GS	367	eh->h_proto = htons(ETH_P_NCSI);
	368	eth_broadcast_addr(eh->h_dest);
	369	eth_broadcast_addr(eh->h_source);
	370
	371	/* Start the timer for the request that might not have
	372	* corresponding response. Given NCSI is an internal
	373	* connection a 1 second delay should be sufficient.
	374	*/
	375	nr->enabled = true;
	376	mod_timer(&nr->timer, jiffies + 1 * HZ);
	377
	378	/* Send NCSI packet */
	379	skb_get(nr->cmd);
	380	ret = dev_queue_xmit(nr->cmd);
	381	if (ret < 0) {
	382	ncsi_free_request(nr);
	383	return ret;
	384	}
	385
	386	return 0;
	387	}