[mirror_ubuntu-jammy-kernel.git] / net / ncsi / ncsi-cmd.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright Gavin Shan, IBM Corporation 2016.
 */

#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) +
		    ALIGN(nca->payload, 4));
	*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_cmd_handler *nch = NULL;
	struct ncsi_request *nr;
	unsigned char type;
	struct ethhdr *eh;
	int i, ret;

	/* Use OEM generic handler for Netlink request */
	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN)
		type = NCSI_PKT_CMD_OEM;
	else
		type = nca->type;

	/* Search for the handler */
	for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
		if (ncsi_cmd_handlers[i].type == 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);

	/* If mac address received from device then use it for
	 * source address as unicast address else use broadcast
	 * address as source address
	 */
	if (nca->ndp->gma_flag == 1)
		memcpy(eh->h_source, nca->ndp->ndev.dev->dev_addr, ETH_ALEN);
	else
		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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
6389eaa7 GS	2	/*
6389eaa7 GS	3	* Copyright Gavin Shan, IBM Corporation 2016.
6389eaa7 GS	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/kernel.h>
	8	#include <linux/init.h>
	9	#include <linux/etherdevice.h>
	10	#include <linux/netdevice.h>
	11	#include <linux/skbuff.h>
	12
	13	#include <net/ncsi.h>
	14	#include <net/net_namespace.h>
	15	#include <net/sock.h>
9771b8cc	16	#include <net/genetlink.h>
6389eaa7 GS	17
	18	#include "internal.h"
	19	#include "ncsi-pkt.h"
	20
	21	u32 ncsi_calculate_checksum(unsigned char *data, int len)
	22	{
	23	u32 checksum = 0;
	24	int i;
	25
	26	for (i = 0; i < len; i += 2)
	27	checksum += (((u32)data[i] << 8) \| data[i + 1]);
	28
	29	checksum = (~checksum + 1);
	30	return checksum;
	31	}
	32
	33	/* This function should be called after the data area has been
	34	* populated completely.
	35	*/
	36	static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
	37	struct ncsi_cmd_arg *nca)
	38	{
	39	u32 checksum;
	40	__be32 *pchecksum;
	41
	42	h->mc_id = 0;
	43	h->revision = NCSI_PKT_REVISION;
	44	h->reserved = 0;
	45	h->id = nca->id;
	46	h->type = nca->type;
	47	h->channel = NCSI_TO_CHANNEL(nca->package,
	48	nca->channel);
	49	h->length = htons(nca->payload);
	50	h->reserved1[0] = 0;
	51	h->reserved1[1] = 0;
	52
	53	/* Fill with calculated checksum */
	54	checksum = ncsi_calculate_checksum((unsigned char *)h,
	55	sizeof(*h) + nca->payload);
	56	pchecksum = (__be32 )((void )h + sizeof(struct ncsi_pkt_hdr) +
96a1b033	57	ALIGN(nca->payload, 4));
6389eaa7 GS	58	*pchecksum = htonl(checksum);
	59	}
	60
	61	static int ncsi_cmd_handler_default(struct sk_buff *skb,
	62	struct ncsi_cmd_arg *nca)
	63	{
	64	struct ncsi_cmd_pkt *cmd;
	65
b080db58	66	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	67	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	68
	69	return 0;
	70	}
	71
	72	static int ncsi_cmd_handler_sp(struct sk_buff *skb,
	73	struct ncsi_cmd_arg *nca)
	74	{
	75	struct ncsi_cmd_sp_pkt *cmd;
	76
b080db58	77	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	78	cmd->hw_arbitration = nca->bytes[0];
	79	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	80
	81	return 0;
	82	}
	83
	84	static int ncsi_cmd_handler_dc(struct sk_buff *skb,
	85	struct ncsi_cmd_arg *nca)
	86	{
	87	struct ncsi_cmd_dc_pkt *cmd;
	88
b080db58	89	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	90	cmd->ald = nca->bytes[0];
	91	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	92
	93	return 0;
	94	}
	95
	96	static int ncsi_cmd_handler_rc(struct sk_buff *skb,
	97	struct ncsi_cmd_arg *nca)
	98	{
	99	struct ncsi_cmd_rc_pkt *cmd;
	100
b080db58	101	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	102	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	103
	104	return 0;
	105	}
	106
	107	static int ncsi_cmd_handler_ae(struct sk_buff *skb,
	108	struct ncsi_cmd_arg *nca)
	109	{
	110	struct ncsi_cmd_ae_pkt *cmd;
	111
b080db58	112	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	113	cmd->mc_id = nca->bytes[0];
	114	cmd->mode = htonl(nca->dwords[1]);
	115	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	116
	117	return 0;
	118	}
	119
	120	static int ncsi_cmd_handler_sl(struct sk_buff *skb,
	121	struct ncsi_cmd_arg *nca)
	122	{
	123	struct ncsi_cmd_sl_pkt *cmd;
	124
b080db58	125	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	126	cmd->mode = htonl(nca->dwords[0]);
	127	cmd->oem_mode = htonl(nca->dwords[1]);
	128	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	129
	130	return 0;
	131	}
	132
	133	static int ncsi_cmd_handler_svf(struct sk_buff *skb,
	134	struct ncsi_cmd_arg *nca)
	135	{
	136	struct ncsi_cmd_svf_pkt *cmd;
	137
b080db58	138	cmd = skb_put_zero(skb, sizeof(*cmd));
8579a67e SMJ	139	cmd->vlan = htons(nca->words[1]);
	140	cmd->index = nca->bytes[6];
	141	cmd->enable = nca->bytes[7];
6389eaa7 GS	142	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	143
	144	return 0;
	145	}
	146
	147	static int ncsi_cmd_handler_ev(struct sk_buff *skb,
	148	struct ncsi_cmd_arg *nca)
	149	{
	150	struct ncsi_cmd_ev_pkt *cmd;
	151
b080db58	152	cmd = skb_put_zero(skb, sizeof(*cmd));
8579a67e	153	cmd->mode = nca->bytes[3];
6389eaa7 GS	154	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	155
	156	return 0;
	157	}
	158
	159	static int ncsi_cmd_handler_sma(struct sk_buff *skb,
	160	struct ncsi_cmd_arg *nca)
	161	{
	162	struct ncsi_cmd_sma_pkt *cmd;
	163	int i;
	164
b080db58	165	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	166	for (i = 0; i < 6; i++)
	167	cmd->mac[i] = nca->bytes[i];
	168	cmd->index = nca->bytes[6];
	169	cmd->at_e = nca->bytes[7];
	170	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	171
	172	return 0;
	173	}
	174
	175	static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
	176	struct ncsi_cmd_arg *nca)
	177	{
	178	struct ncsi_cmd_ebf_pkt *cmd;
	179
b080db58	180	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	181	cmd->mode = htonl(nca->dwords[0]);
	182	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	183
	184	return 0;
	185	}
	186
	187	static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
	188	struct ncsi_cmd_arg *nca)
	189	{
	190	struct ncsi_cmd_egmf_pkt *cmd;
	191
b080db58	192	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	193	cmd->mode = htonl(nca->dwords[0]);
	194	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	195
	196	return 0;
	197	}
	198
	199	static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
	200	struct ncsi_cmd_arg *nca)
	201	{
	202	struct ncsi_cmd_snfc_pkt *cmd;
	203
b080db58	204	cmd = skb_put_zero(skb, sizeof(*cmd));
6389eaa7 GS	205	cmd->mode = nca->bytes[0];
	206	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	207
	208	return 0;
	209	}
	210
fb4ee675 VK	211	static int ncsi_cmd_handler_oem(struct sk_buff *skb,
	212	struct ncsi_cmd_arg *nca)
	213	{
	214	struct ncsi_cmd_oem_pkt *cmd;
	215	unsigned int len;
	216
	217	len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	218	if (nca->payload < 26)
	219	len += 26;
	220	else
	221	len += nca->payload;
	222
	223	cmd = skb_put_zero(skb, len);
	224	memcpy(&cmd->mfr_id, nca->data, nca->payload);
	225	ncsi_cmd_build_header(&cmd->cmd.common, nca);
	226
	227	return 0;
	228	}
	229
6389eaa7 GS	230	static struct ncsi_cmd_handler {
	231	unsigned char type;
	232	int payload;
	233	int (handler)(struct sk_buff skb,
	234	struct ncsi_cmd_arg *nca);
	235	} ncsi_cmd_handlers[] = {
	236	{ NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
	237	{ NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
	238	{ NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
	239	{ NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
	240	{ NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
	241	{ NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
	242	{ NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
	243	{ NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
	244	{ NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
	245	{ NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
	246	{ NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
8579a67e	247	{ NCSI_PKT_CMD_SVF, 8, ncsi_cmd_handler_svf },
6389eaa7 GS	248	{ NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
	249	{ NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
	250	{ NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
	251	{ NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
	252	{ NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
	253	{ NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
	254	{ NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
	255	{ NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
	256	{ NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
	257	{ NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
	258	{ NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
	259	{ NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
	260	{ NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
	261	{ NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
	262	{ NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
fb4ee675	263	{ NCSI_PKT_CMD_OEM, -1, ncsi_cmd_handler_oem },
6389eaa7 GS	264	{ NCSI_PKT_CMD_PLDM, 0, NULL },
	265	{ NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
	266	};
	267
	268	static struct ncsi_request ncsi_alloc_command(struct ncsi_cmd_arg nca)
	269	{
	270	struct ncsi_dev_priv *ndp = nca->ndp;
	271	struct ncsi_dev *nd = &ndp->ndev;
	272	struct net_device *dev = nd->dev;
	273	int hlen = LL_RESERVED_SPACE(dev);
	274	int tlen = dev->needed_tailroom;
	275	int len = hlen + tlen;
	276	struct sk_buff *skb;
	277	struct ncsi_request *nr;
	278
a0509cbe	279	nr = ncsi_alloc_request(ndp, nca->req_flags);
6389eaa7 GS	280	if (!nr)
	281	return NULL;
	282
	283	/* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
	284	* The packet needs padding if its payload is less than 26 bytes to
	285	* meet 64 bytes minimal ethernet frame length.
	286	*/
	287	len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
	288	if (nca->payload < 26)
	289	len += 26;
	290	else
	291	len += nca->payload;
	292
	293	/* Allocate skb */
	294	skb = alloc_skb(len, GFP_ATOMIC);
	295	if (!skb) {
	296	ncsi_free_request(nr);
	297	return NULL;
	298	}
	299
	300	nr->cmd = skb;
	301	skb_reserve(skb, hlen);
	302	skb_reset_network_header(skb);
	303
	304	skb->dev = dev;
	305	skb->protocol = htons(ETH_P_NCSI);
	306
	307	return nr;
	308	}
	309
	310	int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
	311	{
f6edbf2d	312	struct ncsi_cmd_handler *nch = NULL;
6389eaa7	313	struct ncsi_request *nr;
f6edbf2d	314	unsigned char type;
6389eaa7	315	struct ethhdr *eh;
6389eaa7 GS	316	int i, ret;
6389eaa7 GS	317
f6edbf2d JLD	318	/* Use OEM generic handler for Netlink request */
	319	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN)
	320	type = NCSI_PKT_CMD_OEM;
	321	else
	322	type = nca->type;
	323
6389eaa7 GS	324	/* Search for the handler */
6389eaa7 GS	325	for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
f6edbf2d	326	if (ncsi_cmd_handlers[i].type == type) {
6389eaa7 GS	327	if (ncsi_cmd_handlers[i].handler)
	328	nch = &ncsi_cmd_handlers[i];
	329	else
	330	nch = NULL;
	331
	332	break;
	333	}
	334	}
	335
	336	if (!nch) {
	337	netdev_err(nca->ndp->ndev.dev,
	338	"Cannot send packet with type 0x%02x\n", nca->type);
	339	return -ENOENT;
	340	}
	341
fb4ee675 VK	342	/* Get packet payload length and allocate the request
	343	* It is expected that if length set as negative in
	344	* handler structure means caller is initializing it
	345	* and setting length in nca before calling xmit function
	346	*/
	347	if (nch->payload >= 0)
	348	nca->payload = nch->payload;
6389eaa7 GS	349	nr = ncsi_alloc_command(nca);
	350	if (!nr)
	351	return -ENOMEM;
	352
9771b8cc JLD	353	/* track netlink information */
	354	if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
	355	nr->snd_seq = nca->info->snd_seq;
	356	nr->snd_portid = nca->info->snd_portid;
	357	nr->nlhdr = *nca->info->nlhdr;
	358	}
	359
6389eaa7 GS	360	/* Prepare the packet */
	361	nca->id = nr->id;
	362	ret = nch->handler(nr->cmd, nca);
	363	if (ret) {
	364	ncsi_free_request(nr);
	365	return ret;
	366	}
	367
	368	/* Fill the ethernet header */
d58ff351	369	eh = skb_push(nr->cmd, sizeof(*eh));
6389eaa7 GS	370	eh->h_proto = htons(ETH_P_NCSI);
6389eaa7 GS	371	eth_broadcast_addr(eh->h_dest);
7c7b58d4 VK	372
	373	/* If mac address received from device then use it for
	374	* source address as unicast address else use broadcast
	375	* address as source address
	376	*/
	377	if (nca->ndp->gma_flag == 1)
	378	memcpy(eh->h_source, nca->ndp->ndev.dev->dev_addr, ETH_ALEN);
	379	else
	380	eth_broadcast_addr(eh->h_source);
6389eaa7 GS	381
	382	/* Start the timer for the request that might not have
	383	* corresponding response. Given NCSI is an internal
	384	* connection a 1 second delay should be sufficient.
	385	*/
	386	nr->enabled = true;
	387	mod_timer(&nr->timer, jiffies + 1 * HZ);
	388
	389	/* Send NCSI packet */
	390	skb_get(nr->cmd);
	391	ret = dev_queue_xmit(nr->cmd);
	392	if (ret < 0) {
	393	ncsi_free_request(nr);
	394	return ret;
	395	}
	396
	397	return 0;
	398	}