368 lines
9.4 KiB
C
368 lines
9.4 KiB
C
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/*
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* Copyright Gavin Shan, IBM Corporation 2016.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/etherdevice.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/ncsi.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include "internal.h"
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#include "ncsi-pkt.h"
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u32 ncsi_calculate_checksum(unsigned char *data, int len)
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{
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u32 checksum = 0;
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int i;
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for (i = 0; i < len; i += 2)
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checksum += (((u32)data[i] << 8) | data[i + 1]);
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checksum = (~checksum + 1);
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return checksum;
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}
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/* This function should be called after the data area has been
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* populated completely.
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*/
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static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
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struct ncsi_cmd_arg *nca)
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{
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u32 checksum;
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__be32 *pchecksum;
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h->mc_id = 0;
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h->revision = NCSI_PKT_REVISION;
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h->reserved = 0;
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h->id = nca->id;
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h->type = nca->type;
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h->channel = NCSI_TO_CHANNEL(nca->package,
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nca->channel);
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h->length = htons(nca->payload);
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h->reserved1[0] = 0;
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h->reserved1[1] = 0;
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/* Fill with calculated checksum */
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checksum = ncsi_calculate_checksum((unsigned char *)h,
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sizeof(*h) + nca->payload);
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pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
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nca->payload);
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*pchecksum = htonl(checksum);
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}
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static int ncsi_cmd_handler_default(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_pkt *cmd;
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cmd = (struct ncsi_cmd_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_sp(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_sp_pkt *cmd;
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cmd = (struct ncsi_cmd_sp_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->hw_arbitration = nca->bytes[0];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_dc(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_dc_pkt *cmd;
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cmd = (struct ncsi_cmd_dc_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->ald = nca->bytes[0];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_rc(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_rc_pkt *cmd;
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cmd = (struct ncsi_cmd_rc_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_ae(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_ae_pkt *cmd;
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cmd = (struct ncsi_cmd_ae_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mc_id = nca->bytes[0];
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cmd->mode = htonl(nca->dwords[1]);
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_sl(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_sl_pkt *cmd;
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cmd = (struct ncsi_cmd_sl_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mode = htonl(nca->dwords[0]);
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cmd->oem_mode = htonl(nca->dwords[1]);
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_svf(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_svf_pkt *cmd;
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cmd = (struct ncsi_cmd_svf_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->vlan = htons(nca->words[0]);
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cmd->index = nca->bytes[2];
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cmd->enable = nca->bytes[3];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_ev(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_ev_pkt *cmd;
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cmd = (struct ncsi_cmd_ev_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mode = nca->bytes[0];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_sma(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_sma_pkt *cmd;
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int i;
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cmd = (struct ncsi_cmd_sma_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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for (i = 0; i < 6; i++)
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cmd->mac[i] = nca->bytes[i];
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cmd->index = nca->bytes[6];
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cmd->at_e = nca->bytes[7];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_ebf_pkt *cmd;
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cmd = (struct ncsi_cmd_ebf_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mode = htonl(nca->dwords[0]);
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_egmf_pkt *cmd;
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cmd = (struct ncsi_cmd_egmf_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mode = htonl(nca->dwords[0]);
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca)
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{
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struct ncsi_cmd_snfc_pkt *cmd;
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cmd = (struct ncsi_cmd_snfc_pkt *)skb_put(skb, sizeof(*cmd));
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memset(cmd, 0, sizeof(*cmd));
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cmd->mode = nca->bytes[0];
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ncsi_cmd_build_header(&cmd->cmd.common, nca);
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return 0;
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}
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static struct ncsi_cmd_handler {
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unsigned char type;
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int payload;
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int (*handler)(struct sk_buff *skb,
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struct ncsi_cmd_arg *nca);
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} ncsi_cmd_handlers[] = {
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{ NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
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{ NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
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{ NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
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{ NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
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{ NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
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{ NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_SVF, 4, ncsi_cmd_handler_svf },
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{ NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
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{ NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
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{ NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
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{ NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
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{ NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
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{ NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
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{ NCSI_PKT_CMD_OEM, 0, NULL },
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{ NCSI_PKT_CMD_PLDM, 0, NULL },
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{ NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
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};
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static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
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{
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struct ncsi_dev_priv *ndp = nca->ndp;
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struct ncsi_dev *nd = &ndp->ndev;
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struct net_device *dev = nd->dev;
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int hlen = LL_RESERVED_SPACE(dev);
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int tlen = dev->needed_tailroom;
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int len = hlen + tlen;
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struct sk_buff *skb;
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struct ncsi_request *nr;
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nr = ncsi_alloc_request(ndp, nca->req_flags);
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if (!nr)
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return NULL;
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/* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
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* The packet needs padding if its payload is less than 26 bytes to
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* meet 64 bytes minimal ethernet frame length.
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*/
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len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
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if (nca->payload < 26)
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len += 26;
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else
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len += nca->payload;
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/* Allocate skb */
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skb = alloc_skb(len, GFP_ATOMIC);
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if (!skb) {
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ncsi_free_request(nr);
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return NULL;
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}
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nr->cmd = skb;
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skb_reserve(skb, hlen);
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skb_reset_network_header(skb);
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skb->dev = dev;
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skb->protocol = htons(ETH_P_NCSI);
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return nr;
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}
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int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
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{
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struct ncsi_request *nr;
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struct ethhdr *eh;
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struct ncsi_cmd_handler *nch = NULL;
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int i, ret;
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/* Search for the handler */
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for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
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if (ncsi_cmd_handlers[i].type == nca->type) {
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if (ncsi_cmd_handlers[i].handler)
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nch = &ncsi_cmd_handlers[i];
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else
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nch = NULL;
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break;
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}
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}
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if (!nch) {
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netdev_err(nca->ndp->ndev.dev,
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"Cannot send packet with type 0x%02x\n", nca->type);
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return -ENOENT;
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}
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/* Get packet payload length and allocate the request */
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nca->payload = nch->payload;
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nr = ncsi_alloc_command(nca);
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if (!nr)
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return -ENOMEM;
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/* Prepare the packet */
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nca->id = nr->id;
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ret = nch->handler(nr->cmd, nca);
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if (ret) {
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ncsi_free_request(nr);
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return ret;
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}
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/* Fill the ethernet header */
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eh = (struct ethhdr *)skb_push(nr->cmd, sizeof(*eh));
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eh->h_proto = htons(ETH_P_NCSI);
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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;
|
||
|
|
}
|