提交 6389eaa7 编写于 作者: G Gavin Shan 提交者: David S. Miller

net/ncsi: NCSI command packet handler

The NCSI command packets are sent from MC (Management Controller)
to remote end. They are used for multiple purposes: probe existing
NCSI package/channel, retrieve NCSI channel's capability, configure
NCSI channel etc.

This defines struct to represent NCSI command packets and introduces
function ncsi_xmit_cmd(), which will be used to transmit NCSI command
packet according to the request. The request is represented by struct
ncsi_cmd_arg.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 2d283bdd
......@@ -87,6 +87,7 @@
#define ETH_P_8021AH 0x88E7 /* 802.1ah Backbone Service Tag */
#define ETH_P_MVRP 0x88F5 /* 802.1Q MVRP */
#define ETH_P_1588 0x88F7 /* IEEE 1588 Timesync */
#define ETH_P_NCSI 0x88F8 /* NCSI protocol */
#define ETH_P_PRP 0x88FB /* IEC 62439-3 PRP/HSRv0 */
#define ETH_P_FCOE 0x8906 /* Fibre Channel over Ethernet */
#define ETH_P_TDLS 0x890D /* TDLS */
......
#
# Makefile for NCSI API
#
obj-$(CONFIG_NET_NCSI) += ncsi-manage.o
obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-manage.o
......@@ -220,6 +220,21 @@ struct ncsi_dev_priv {
struct list_head node; /* Form NCSI device list */
};
struct ncsi_cmd_arg {
struct ncsi_dev_priv *ndp; /* Associated NCSI device */
unsigned char type; /* Command in the NCSI packet */
unsigned char id; /* Request ID (sequence number) */
unsigned char package; /* Destination package ID */
unsigned char channel; /* Detination channel ID or 0x1f */
unsigned short payload; /* Command packet payload length */
bool driven; /* Drive the state machine? */
union {
unsigned char bytes[16]; /* Command packet specific data */
unsigned short words[8];
unsigned int dwords[4];
};
};
extern struct list_head ncsi_dev_list;
extern spinlock_t ncsi_dev_lock;
......@@ -253,4 +268,8 @@ struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven);
void ncsi_free_request(struct ncsi_request *nr);
struct ncsi_dev *ncsi_find_dev(struct net_device *dev);
/* Packet handlers */
u32 ncsi_calculate_checksum(unsigned char *data, int len);
int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca);
#endif /* __NCSI_INTERNAL_H__ */
/*
* 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;
}
/*
* 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.
*/
#ifndef __NCSI_PKT_H__
#define __NCSI_PKT_H__
struct ncsi_pkt_hdr {
unsigned char mc_id; /* Management controller ID */
unsigned char revision; /* NCSI version - 0x01 */
unsigned char reserved; /* Reserved */
unsigned char id; /* Packet sequence number */
unsigned char type; /* Packet type */
unsigned char channel; /* Network controller ID */
__be16 length; /* Payload length */
__be32 reserved1[2]; /* Reserved */
};
struct ncsi_cmd_pkt_hdr {
struct ncsi_pkt_hdr common; /* Common NCSI packet header */
};
/* NCSI common command packet */
struct ncsi_cmd_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be32 checksum; /* Checksum */
unsigned char pad[26];
};
/* Select Package */
struct ncsi_cmd_sp_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char reserved[3]; /* Reserved */
unsigned char hw_arbitration; /* HW arbitration */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* Disable Channel */
struct ncsi_cmd_dc_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char reserved[3]; /* Reserved */
unsigned char ald; /* Allow link down */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* Reset Channel */
struct ncsi_cmd_rc_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be32 reserved; /* Reserved */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* AEN Enable */
struct ncsi_cmd_ae_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char reserved[3]; /* Reserved */
unsigned char mc_id; /* MC ID */
__be32 mode; /* AEN working mode */
__be32 checksum; /* Checksum */
unsigned char pad[18];
};
/* Set Link */
struct ncsi_cmd_sl_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be32 mode; /* Link working mode */
__be32 oem_mode; /* OEM link mode */
__be32 checksum; /* Checksum */
unsigned char pad[18];
};
/* Set VLAN Filter */
struct ncsi_cmd_svf_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be16 reserved; /* Reserved */
__be16 vlan; /* VLAN ID */
__be16 reserved1; /* Reserved */
unsigned char index; /* VLAN table index */
unsigned char enable; /* Enable or disable */
__be32 checksum; /* Checksum */
unsigned char pad[14];
};
/* Enable VLAN */
struct ncsi_cmd_ev_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char reserved[3]; /* Reserved */
unsigned char mode; /* VLAN filter mode */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* Set MAC Address */
struct ncsi_cmd_sma_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char mac[6]; /* MAC address */
unsigned char index; /* MAC table index */
unsigned char at_e; /* Addr type and operation */
__be32 checksum; /* Checksum */
unsigned char pad[18];
};
/* Enable Broadcast Filter */
struct ncsi_cmd_ebf_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be32 mode; /* Filter mode */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* Enable Global Multicast Filter */
struct ncsi_cmd_egmf_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
__be32 mode; /* Global MC mode */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* Set NCSI Flow Control */
struct ncsi_cmd_snfc_pkt {
struct ncsi_cmd_pkt_hdr cmd; /* Command header */
unsigned char reserved[3]; /* Reserved */
unsigned char mode; /* Flow control mode */
__be32 checksum; /* Checksum */
unsigned char pad[22];
};
/* NCSI packet revision */
#define NCSI_PKT_REVISION 0x01
/* NCSI packet commands */
#define NCSI_PKT_CMD_CIS 0x00 /* Clear Initial State */
#define NCSI_PKT_CMD_SP 0x01 /* Select Package */
#define NCSI_PKT_CMD_DP 0x02 /* Deselect Package */
#define NCSI_PKT_CMD_EC 0x03 /* Enable Channel */
#define NCSI_PKT_CMD_DC 0x04 /* Disable Channel */
#define NCSI_PKT_CMD_RC 0x05 /* Reset Channel */
#define NCSI_PKT_CMD_ECNT 0x06 /* Enable Channel Network Tx */
#define NCSI_PKT_CMD_DCNT 0x07 /* Disable Channel Network Tx */
#define NCSI_PKT_CMD_AE 0x08 /* AEN Enable */
#define NCSI_PKT_CMD_SL 0x09 /* Set Link */
#define NCSI_PKT_CMD_GLS 0x0a /* Get Link */
#define NCSI_PKT_CMD_SVF 0x0b /* Set VLAN Filter */
#define NCSI_PKT_CMD_EV 0x0c /* Enable VLAN */
#define NCSI_PKT_CMD_DV 0x0d /* Disable VLAN */
#define NCSI_PKT_CMD_SMA 0x0e /* Set MAC address */
#define NCSI_PKT_CMD_EBF 0x10 /* Enable Broadcast Filter */
#define NCSI_PKT_CMD_DBF 0x11 /* Disable Broadcast Filter */
#define NCSI_PKT_CMD_EGMF 0x12 /* Enable Global Multicast Filter */
#define NCSI_PKT_CMD_DGMF 0x13 /* Disable Global Multicast Filter */
#define NCSI_PKT_CMD_SNFC 0x14 /* Set NCSI Flow Control */
#define NCSI_PKT_CMD_GVI 0x15 /* Get Version ID */
#define NCSI_PKT_CMD_GC 0x16 /* Get Capabilities */
#define NCSI_PKT_CMD_GP 0x17 /* Get Parameters */
#define NCSI_PKT_CMD_GCPS 0x18 /* Get Controller Packet Statistics */
#define NCSI_PKT_CMD_GNS 0x19 /* Get NCSI Statistics */
#define NCSI_PKT_CMD_GNPTS 0x1a /* Get NCSI Pass-throu Statistics */
#define NCSI_PKT_CMD_GPS 0x1b /* Get package status */
#define NCSI_PKT_CMD_OEM 0x50 /* OEM */
#define NCSI_PKT_CMD_PLDM 0x51 /* PLDM request over NCSI over RBT */
#define NCSI_PKT_CMD_GPUUID 0x52 /* Get package UUID */
#endif /* __NCSI_PKT_H__ */
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册