598 lines
12 KiB
C
598 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Management Complex (MC) userspace support
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*
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* Copyright 2021 NXP
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*
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*/
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/miscdevice.h>
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#include "fsl-mc-private.h"
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struct uapi_priv_data {
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struct fsl_mc_uapi *uapi;
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struct fsl_mc_io *mc_io;
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};
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struct fsl_mc_cmd_desc {
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u16 cmdid_value;
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u16 cmdid_mask;
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int size;
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bool token;
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int flags;
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};
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#define FSL_MC_CHECK_MODULE_ID BIT(0)
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#define FSL_MC_CAP_NET_ADMIN_NEEDED BIT(1)
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enum fsl_mc_cmd_index {
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DPDBG_DUMP = 0,
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DPDBG_SET,
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DPRC_GET_CONTAINER_ID,
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DPRC_CREATE_CONT,
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DPRC_DESTROY_CONT,
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DPRC_ASSIGN,
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DPRC_UNASSIGN,
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DPRC_GET_OBJ_COUNT,
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DPRC_GET_OBJ,
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DPRC_GET_RES_COUNT,
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DPRC_GET_RES_IDS,
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DPRC_SET_OBJ_LABEL,
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DPRC_SET_LOCKED,
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DPRC_CONNECT,
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DPRC_DISCONNECT,
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DPRC_GET_POOL,
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DPRC_GET_POOL_COUNT,
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DPRC_GET_CONNECTION,
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DPCI_GET_LINK_STATE,
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DPCI_GET_PEER_ATTR,
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DPAIOP_GET_SL_VERSION,
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DPAIOP_GET_STATE,
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DPMNG_GET_VERSION,
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DPSECI_GET_TX_QUEUE,
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DPMAC_GET_COUNTER,
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DPMAC_GET_MAC_ADDR,
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DPNI_SET_PRIM_MAC,
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DPNI_GET_PRIM_MAC,
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DPNI_GET_STATISTICS,
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DPNI_GET_LINK_STATE,
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DPNI_GET_MAX_FRAME_LENGTH,
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DPSW_GET_TAILDROP,
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DPSW_SET_TAILDROP,
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DPSW_IF_GET_COUNTER,
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DPSW_IF_GET_MAX_FRAME_LENGTH,
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DPDMUX_GET_COUNTER,
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DPDMUX_IF_GET_MAX_FRAME_LENGTH,
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GET_ATTR,
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GET_IRQ_MASK,
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GET_IRQ_STATUS,
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CLOSE,
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OPEN,
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GET_API_VERSION,
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DESTROY,
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CREATE,
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};
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static struct fsl_mc_cmd_desc fsl_mc_accepted_cmds[] = {
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[DPDBG_DUMP] = {
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.cmdid_value = 0x1300,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 28,
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},
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[DPDBG_SET] = {
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.cmdid_value = 0x1400,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 28,
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},
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[DPRC_GET_CONTAINER_ID] = {
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.cmdid_value = 0x8300,
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.cmdid_mask = 0xFFF0,
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.token = false,
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.size = 8,
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},
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[DPRC_CREATE_CONT] = {
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.cmdid_value = 0x1510,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 40,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_DESTROY_CONT] = {
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.cmdid_value = 0x1520,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 12,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_ASSIGN] = {
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.cmdid_value = 0x1570,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 40,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_UNASSIGN] = {
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.cmdid_value = 0x1580,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 40,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_GET_OBJ_COUNT] = {
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.cmdid_value = 0x1590,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 16,
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},
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[DPRC_GET_OBJ] = {
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.cmdid_value = 0x15A0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 12,
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},
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[DPRC_GET_RES_COUNT] = {
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.cmdid_value = 0x15B0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 32,
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},
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[DPRC_GET_RES_IDS] = {
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.cmdid_value = 0x15C0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 40,
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},
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[DPRC_SET_OBJ_LABEL] = {
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.cmdid_value = 0x1610,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 48,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_SET_LOCKED] = {
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.cmdid_value = 0x16B0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 16,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_CONNECT] = {
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.cmdid_value = 0x1670,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 56,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_DISCONNECT] = {
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.cmdid_value = 0x1680,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 32,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPRC_GET_POOL] = {
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.cmdid_value = 0x1690,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 12,
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},
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[DPRC_GET_POOL_COUNT] = {
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.cmdid_value = 0x16A0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPRC_GET_CONNECTION] = {
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.cmdid_value = 0x16C0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 32,
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},
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[DPCI_GET_LINK_STATE] = {
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.cmdid_value = 0x0E10,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPCI_GET_PEER_ATTR] = {
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.cmdid_value = 0x0E20,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPAIOP_GET_SL_VERSION] = {
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.cmdid_value = 0x2820,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPAIOP_GET_STATE] = {
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.cmdid_value = 0x2830,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPMNG_GET_VERSION] = {
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.cmdid_value = 0x8310,
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.cmdid_mask = 0xFFF0,
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.token = false,
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.size = 8,
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},
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[DPSECI_GET_TX_QUEUE] = {
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.cmdid_value = 0x1970,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 14,
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},
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[DPMAC_GET_COUNTER] = {
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.cmdid_value = 0x0c40,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 9,
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},
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[DPMAC_GET_MAC_ADDR] = {
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.cmdid_value = 0x0c50,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPNI_SET_PRIM_MAC] = {
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.cmdid_value = 0x2240,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 16,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPNI_GET_PRIM_MAC] = {
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.cmdid_value = 0x2250,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPNI_GET_STATISTICS] = {
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.cmdid_value = 0x25D0,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 10,
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},
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[DPNI_GET_LINK_STATE] = {
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.cmdid_value = 0x2150,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPNI_GET_MAX_FRAME_LENGTH] = {
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.cmdid_value = 0x2170,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[DPSW_GET_TAILDROP] = {
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.cmdid_value = 0x0A80,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 14,
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},
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[DPSW_SET_TAILDROP] = {
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.cmdid_value = 0x0A90,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 24,
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.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[DPSW_IF_GET_COUNTER] = {
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.cmdid_value = 0x0340,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 11,
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},
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[DPSW_IF_GET_MAX_FRAME_LENGTH] = {
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.cmdid_value = 0x0450,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 10,
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},
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[DPDMUX_GET_COUNTER] = {
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.cmdid_value = 0x0b20,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 11,
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},
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[DPDMUX_IF_GET_MAX_FRAME_LENGTH] = {
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.cmdid_value = 0x0a20,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 10,
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},
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[GET_ATTR] = {
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.cmdid_value = 0x0040,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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[GET_IRQ_MASK] = {
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.cmdid_value = 0x0150,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 13,
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},
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[GET_IRQ_STATUS] = {
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.cmdid_value = 0x0160,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 13,
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},
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[CLOSE] = {
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.cmdid_value = 0x8000,
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.cmdid_mask = 0xFFF0,
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.token = true,
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.size = 8,
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},
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/* Common commands amongst all types of objects. Must be checked last. */
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[OPEN] = {
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.cmdid_value = 0x8000,
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.cmdid_mask = 0xFC00,
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.token = false,
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.size = 12,
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.flags = FSL_MC_CHECK_MODULE_ID,
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},
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[GET_API_VERSION] = {
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.cmdid_value = 0xA000,
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.cmdid_mask = 0xFC00,
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.token = false,
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.size = 8,
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.flags = FSL_MC_CHECK_MODULE_ID,
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},
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[DESTROY] = {
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.cmdid_value = 0x9800,
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.cmdid_mask = 0xFC00,
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.token = true,
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.size = 12,
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.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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[CREATE] = {
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.cmdid_value = 0x9000,
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.cmdid_mask = 0xFC00,
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.token = true,
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.size = 64,
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.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
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},
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};
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#define FSL_MC_NUM_ACCEPTED_CMDS ARRAY_SIZE(fsl_mc_accepted_cmds)
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#define FSL_MC_MAX_MODULE_ID 0x10
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static int fsl_mc_command_check(struct fsl_mc_device *mc_dev,
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struct fsl_mc_command *mc_cmd)
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{
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struct fsl_mc_cmd_desc *desc = NULL;
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int mc_cmd_max_size, i;
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bool token_provided;
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u16 cmdid, module_id;
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char *mc_cmd_end;
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char sum = 0;
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/* Check if this is an accepted MC command */
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cmdid = mc_cmd_hdr_read_cmdid(mc_cmd);
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for (i = 0; i < FSL_MC_NUM_ACCEPTED_CMDS; i++) {
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desc = &fsl_mc_accepted_cmds[i];
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if ((cmdid & desc->cmdid_mask) == desc->cmdid_value)
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break;
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}
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if (i == FSL_MC_NUM_ACCEPTED_CMDS) {
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dev_err(&mc_dev->dev, "MC command 0x%04x: cmdid not accepted\n", cmdid);
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return -EACCES;
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}
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/* Check if the size of the command is honored. Anything beyond the
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* last valid byte of the command should be zeroed.
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*/
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mc_cmd_max_size = sizeof(*mc_cmd);
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mc_cmd_end = ((char *)mc_cmd) + desc->size;
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for (i = desc->size; i < mc_cmd_max_size; i++)
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sum |= *mc_cmd_end++;
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if (sum) {
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dev_err(&mc_dev->dev, "MC command 0x%04x: garbage beyond max size of %d bytes!\n",
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cmdid, desc->size);
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return -EACCES;
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}
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/* Some MC commands request a token to be passed so that object
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* identification is possible. Check if the token passed in the command
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* is as expected.
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*/
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token_provided = mc_cmd_hdr_read_token(mc_cmd) ? true : false;
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if (token_provided != desc->token) {
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dev_err(&mc_dev->dev, "MC command 0x%04x: token 0x%04x is invalid!\n",
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cmdid, mc_cmd_hdr_read_token(mc_cmd));
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return -EACCES;
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}
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/* If needed, check if the module ID passed is valid */
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if (desc->flags & FSL_MC_CHECK_MODULE_ID) {
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/* The module ID is represented by bits [4:9] from the cmdid */
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module_id = (cmdid & GENMASK(9, 4)) >> 4;
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if (module_id == 0 || module_id > FSL_MC_MAX_MODULE_ID) {
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dev_err(&mc_dev->dev, "MC command 0x%04x: unknown module ID 0x%x\n",
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cmdid, module_id);
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return -EACCES;
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}
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}
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/* Some commands alter how hardware resources are managed. For these
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* commands, check for CAP_NET_ADMIN.
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*/
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if (desc->flags & FSL_MC_CAP_NET_ADMIN_NEEDED) {
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if (!capable(CAP_NET_ADMIN)) {
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dev_err(&mc_dev->dev, "MC command 0x%04x: needs CAP_NET_ADMIN!\n",
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cmdid);
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return -EPERM;
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}
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}
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return 0;
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}
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static int fsl_mc_uapi_send_command(struct fsl_mc_device *mc_dev, unsigned long arg,
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struct fsl_mc_io *mc_io)
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{
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struct fsl_mc_command mc_cmd;
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int error;
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error = copy_from_user(&mc_cmd, (void __user *)arg, sizeof(mc_cmd));
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if (error)
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return -EFAULT;
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error = fsl_mc_command_check(mc_dev, &mc_cmd);
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if (error)
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return error;
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error = mc_send_command(mc_io, &mc_cmd);
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if (error)
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return error;
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error = copy_to_user((void __user *)arg, &mc_cmd, sizeof(mc_cmd));
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if (error)
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return -EFAULT;
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return 0;
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}
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static int fsl_mc_uapi_dev_open(struct inode *inode, struct file *filep)
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{
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struct fsl_mc_device *root_mc_device;
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struct uapi_priv_data *priv_data;
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struct fsl_mc_io *dynamic_mc_io;
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struct fsl_mc_uapi *mc_uapi;
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struct fsl_mc_bus *mc_bus;
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int error;
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priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL);
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if (!priv_data)
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return -ENOMEM;
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mc_uapi = container_of(filep->private_data, struct fsl_mc_uapi, misc);
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mc_bus = container_of(mc_uapi, struct fsl_mc_bus, uapi_misc);
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root_mc_device = &mc_bus->mc_dev;
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mutex_lock(&mc_uapi->mutex);
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if (!mc_uapi->local_instance_in_use) {
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priv_data->mc_io = mc_uapi->static_mc_io;
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mc_uapi->local_instance_in_use = 1;
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} else {
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error = fsl_mc_portal_allocate(root_mc_device, 0,
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&dynamic_mc_io);
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if (error) {
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dev_dbg(&root_mc_device->dev,
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"Could not allocate MC portal\n");
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goto error_portal_allocate;
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}
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priv_data->mc_io = dynamic_mc_io;
|
|
}
|
|
priv_data->uapi = mc_uapi;
|
|
filep->private_data = priv_data;
|
|
|
|
mutex_unlock(&mc_uapi->mutex);
|
|
|
|
return 0;
|
|
|
|
error_portal_allocate:
|
|
mutex_unlock(&mc_uapi->mutex);
|
|
kfree(priv_data);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int fsl_mc_uapi_dev_release(struct inode *inode, struct file *filep)
|
|
{
|
|
struct uapi_priv_data *priv_data;
|
|
struct fsl_mc_uapi *mc_uapi;
|
|
struct fsl_mc_io *mc_io;
|
|
|
|
priv_data = filep->private_data;
|
|
mc_uapi = priv_data->uapi;
|
|
mc_io = priv_data->mc_io;
|
|
|
|
mutex_lock(&mc_uapi->mutex);
|
|
|
|
if (mc_io == mc_uapi->static_mc_io)
|
|
mc_uapi->local_instance_in_use = 0;
|
|
else
|
|
fsl_mc_portal_free(mc_io);
|
|
|
|
kfree(filep->private_data);
|
|
filep->private_data = NULL;
|
|
|
|
mutex_unlock(&mc_uapi->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long fsl_mc_uapi_dev_ioctl(struct file *file,
|
|
unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct uapi_priv_data *priv_data = file->private_data;
|
|
struct fsl_mc_device *root_mc_device;
|
|
struct fsl_mc_bus *mc_bus;
|
|
int error;
|
|
|
|
mc_bus = container_of(priv_data->uapi, struct fsl_mc_bus, uapi_misc);
|
|
root_mc_device = &mc_bus->mc_dev;
|
|
|
|
switch (cmd) {
|
|
case FSL_MC_SEND_MC_COMMAND:
|
|
error = fsl_mc_uapi_send_command(root_mc_device, arg, priv_data->mc_io);
|
|
break;
|
|
default:
|
|
dev_dbg(&root_mc_device->dev, "unexpected ioctl call number\n");
|
|
error = -EINVAL;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static const struct file_operations fsl_mc_uapi_dev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = fsl_mc_uapi_dev_open,
|
|
.release = fsl_mc_uapi_dev_release,
|
|
.unlocked_ioctl = fsl_mc_uapi_dev_ioctl,
|
|
};
|
|
|
|
int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
|
|
{
|
|
struct fsl_mc_device *mc_dev = &mc_bus->mc_dev;
|
|
struct fsl_mc_uapi *mc_uapi = &mc_bus->uapi_misc;
|
|
int error;
|
|
|
|
mc_uapi->misc.minor = MISC_DYNAMIC_MINOR;
|
|
mc_uapi->misc.name = dev_name(&mc_dev->dev);
|
|
mc_uapi->misc.fops = &fsl_mc_uapi_dev_fops;
|
|
|
|
error = misc_register(&mc_uapi->misc);
|
|
if (error)
|
|
return error;
|
|
|
|
mc_uapi->static_mc_io = mc_bus->mc_dev.mc_io;
|
|
|
|
mutex_init(&mc_uapi->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
|
|
{
|
|
misc_deregister(&mc_bus->uapi_misc.misc);
|
|
}
|