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Release 4.11 net/ncsi/ncsi-cmd.c

Directory: net/ncsi
/*
 * 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; }

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/* 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); }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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->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; }

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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; }

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Directory: net/ncsi
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