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398 lines
9.7 KiB
398 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright Gavin Shan, IBM Corporation 2016. |
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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 <net/genetlink.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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ALIGN(nca->payload, 4)); |
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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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, sizeof(*cmd)); |
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cmd->vlan = htons(nca->words[1]); |
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cmd->index = nca->bytes[6]; |
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cmd->enable = 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_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 = skb_put_zero(skb, sizeof(*cmd)); |
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cmd->mode = 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_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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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_oem(struct sk_buff *skb, |
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struct ncsi_cmd_arg *nca) |
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{ |
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struct ncsi_cmd_oem_pkt *cmd; |
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unsigned int len; |
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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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cmd = skb_put_zero(skb, len); |
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memcpy(&cmd->mfr_id, nca->data, nca->payload); |
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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, 8, 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, -1, ncsi_cmd_handler_oem }, |
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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_cmd_handler *nch = NULL; |
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struct ncsi_request *nr; |
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unsigned char type; |
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struct ethhdr *eh; |
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int i, ret; |
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/* Use OEM generic handler for Netlink request */ |
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if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) |
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type = NCSI_PKT_CMD_OEM; |
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else |
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type = nca->type; |
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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 == 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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* It is expected that if length set as negative in |
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* handler structure means caller is initializing it |
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* and setting length in nca before calling xmit function |
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*/ |
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if (nch->payload >= 0) |
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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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/* track netlink information */ |
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if (nca->req_flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) { |
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nr->snd_seq = nca->info->snd_seq; |
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nr->snd_portid = nca->info->snd_portid; |
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nr->nlhdr = *nca->info->nlhdr; |
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} |
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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 = 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); |
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/* If mac address received from device then use it for |
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* source address as unicast address else use broadcast |
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* address as source address |
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*/ |
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if (nca->ndp->gma_flag == 1) |
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memcpy(eh->h_source, nca->ndp->ndev.dev->dev_addr, ETH_ALEN); |
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else |
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eth_broadcast_addr(eh->h_source); |
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/* Start the timer for the request that might not have |
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* corresponding response. Given NCSI is an internal |
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* connection a 1 second delay should be sufficient. |
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*/ |
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nr->enabled = true; |
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mod_timer(&nr->timer, jiffies + 1 * HZ); |
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/* Send NCSI packet */ |
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skb_get(nr->cmd); |
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ret = dev_queue_xmit(nr->cmd); |
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if (ret < 0) { |
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ncsi_free_request(nr); |
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return ret; |
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} |
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return 0; |
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}
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