https://github.com/torvalds/linux
Tip revision: 80e78fcce86de0288793a0ef0f6acf37656ee4cf authored by Linus Torvalds on 11 September 2022, 20:22:01 UTC
Linux 6.0-rc5
Linux 6.0-rc5
Tip revision: 80e78fc
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"
static const int padding_bytes = 26;
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;
int payload;
/* NC-SI spec DSP_0222_1.2.0, section 8.2.2.2
* requires payload to be padded with 0 to
* 32-bit boundary before the checksum field.
* Ensure the padding bytes are accounted for in
* skb allocation
*/
payload = ALIGN(nca->payload, 4);
len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
len += max(payload, padding_bytes);
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 payload;
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.
* Payload needs padding so that the checksum field following payload is
* aligned to 32-bit boundary.
* 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;
payload = ALIGN(nca->payload, 4);
len += max(payload, padding_bytes);
/* 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;
}