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Date:   Fri, 17 Jul 2020 12:11:59 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Luo bin <luobin9@...wei.com>
Cc:     <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <luoxianjun@...wei.com>,
        <yin.yinshi@...wei.com>, <cloud.wangxiaoyun@...wei.com>,
        <chiqijun@...wei.com>
Subject: Re: [PATCH net-next v1 1/2] hinic: add support to handle hw
 abnormal event

On Fri, 17 Jul 2020 16:34:47 +0800 Luo bin wrote:
> add support to handle hw abnormal event such as hardware failure,
> cable unplugged,link error
> 
> Signed-off-by: Luo bin <luobin9@...wei.com>
> Reported-by: kernel test robot <lkp@...el.com>

> +static void hinic_comm_recv_mgmt_self_cmd_reg(struct hinic_pfhwdev *pfhwdev,
> +					      u8 cmd,
> +					      comm_mgmt_self_msg_proc proc)
> +{
> +	u8 cmd_idx;
> +
> +	cmd_idx = pfhwdev->proc.cmd_num;
> +	if (cmd_idx >= HINIC_COMM_SELF_CMD_MAX) {
> +		dev_err(&pfhwdev->hwdev.hwif->pdev->dev,
> +			"Register recv mgmt process failed, cmd: 0x%x\n", cmd);
> +		return;
> +	}
> +
> +	pfhwdev->proc.info[cmd_idx].cmd = cmd;
> +	pfhwdev->proc.info[cmd_idx].proc = proc;
> +	pfhwdev->proc.cmd_num++;
> +}
> +
> +static void hinic_comm_recv_mgmt_self_cmd_unreg(struct hinic_pfhwdev *pfhwdev,
> +						u8 cmd)
> +{
> +	u8 cmd_idx;
> +
> +	cmd_idx = pfhwdev->proc.cmd_num;
> +	if (cmd_idx >= HINIC_COMM_SELF_CMD_MAX) {
> +		dev_err(&pfhwdev->hwdev.hwif->pdev->dev, "Unregister recv mgmt process failed, cmd: 0x%x\n",
> +			cmd);
> +		return;
> +	}
> +
> +	for (cmd_idx = 0; cmd_idx < HINIC_COMM_SELF_CMD_MAX; cmd_idx++) {
> +		if (cmd == pfhwdev->proc.info[cmd_idx].cmd) {
> +			pfhwdev->proc.info[cmd_idx].cmd = 0;
> +			pfhwdev->proc.info[cmd_idx].proc = NULL;
> +			pfhwdev->proc.cmd_num--;
> +		}
> +	}
> +}
> +
> +static void comm_mgmt_msg_handler(void *handle, u8 cmd, void *buf_in,
> +				  u16 in_size, void *buf_out, u16 *out_size)
> +{
> +	struct hinic_pfhwdev *pfhwdev = handle;
> +	u8 cmd_idx;
> +
> +	for (cmd_idx = 0; cmd_idx < pfhwdev->proc.cmd_num; cmd_idx++) {
> +		if (cmd == pfhwdev->proc.info[cmd_idx].cmd) {
> +			if (!pfhwdev->proc.info[cmd_idx].proc) {
> +				dev_warn(&pfhwdev->hwdev.hwif->pdev->dev,
> +					 "PF recv mgmt comm msg handle null, cmd: 0x%x\n",
> +					 cmd);
> +			} else {
> +				pfhwdev->proc.info[cmd_idx].proc
> +					(&pfhwdev->hwdev, buf_in, in_size,
> +					 buf_out, out_size);
> +			}
> +
> +			return;
> +		}
> +	}
> +
> +	dev_warn(&pfhwdev->hwdev.hwif->pdev->dev, "Received unknown mgmt cpu event: 0x%x\n",
> +		 cmd);
> +
> +	*out_size = 0;
> +}
> +
> +static void chip_fault_show(struct hinic_hwdev *hwdev,
> +			    struct hinic_fault_event *event)
> +{
> +	char fault_level[FAULT_TYPE_MAX][FAULT_SHOW_STR_LEN + 1] = {
> +		"fatal", "reset", "flr", "general", "suggestion"};
> +	char level_str[FAULT_SHOW_STR_LEN + 1] = {0};
> +	u8 level;
> +
> +	level = event->event.chip.err_level;
> +	if (level < FAULT_LEVEL_MAX)
> +		strncpy(level_str, fault_level[level],
> +			FAULT_SHOW_STR_LEN);
> +	else
> +		strncpy(level_str, "Unknown", FAULT_SHOW_STR_LEN);
> +
> +	if (level == FAULT_LEVEL_SERIOUS_FLR)
> +		dev_err(&hwdev->hwif->pdev->dev, "err_level: %d [%s], flr func_id: %d\n",
> +			level, level_str, event->event.chip.func_id);
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Module_id: 0x%x, err_type: 0x%x, err_level: %d[%s], err_csr_addr: 0x%08x, err_csr_value: 0x%08x\n",
> +		event->event.chip.node_id,
> +		event->event.chip.err_type, level, level_str,
> +		event->event.chip.err_csr_addr,
> +		event->event.chip.err_csr_value);
> +}
> +
> +static void fault_report_show(struct hinic_hwdev *hwdev,
> +			      struct hinic_fault_event *event)
> +{
> +	char fault_type[FAULT_TYPE_MAX][FAULT_SHOW_STR_LEN + 1] = {
> +		"chip", "ucode", "mem rd timeout", "mem wr timeout",
> +		"reg rd timeout", "reg wr timeout", "phy fault"};
> +	char type_str[FAULT_SHOW_STR_LEN + 1] = {0};
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Fault event report received, func_id: %d\n",
> +		HINIC_HWIF_FUNC_IDX(hwdev->hwif));
> +
> +	if (event->type < FAULT_TYPE_MAX)
> +		strncpy(type_str, fault_type[event->type], FAULT_SHOW_STR_LEN);
> +	else
> +		strncpy(type_str, "Unknown", FAULT_SHOW_STR_LEN);
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Fault type: %d [%s]\n", event->type,
> +		type_str);
> +	dev_err(&hwdev->hwif->pdev->dev,  "Fault val[0]: 0x%08x, val[1]: 0x%08x, val[2]: 0x%08x, val[3]: 0x%08x\n",
> +		event->event.val[0], event->event.val[1], event->event.val[2],
> +		event->event.val[3]);
> +
> +	switch (event->type) {
> +	case FAULT_TYPE_CHIP:
> +		chip_fault_show(hwdev, event);
> +		break;
> +	case FAULT_TYPE_UCODE:
> +		dev_err(&hwdev->hwif->pdev->dev, "Cause_id: %d, core_id: %d, c_id: %d, epc: 0x%08x\n",
> +			event->event.ucode.cause_id, event->event.ucode.core_id,
> +			event->event.ucode.c_id, event->event.ucode.epc);
> +		break;
> +	case FAULT_TYPE_MEM_RD_TIMEOUT:
> +	case FAULT_TYPE_MEM_WR_TIMEOUT:
> +		dev_err(&hwdev->hwif->pdev->dev, "Err_csr_ctrl: 0x%08x, err_csr_data: 0x%08x, ctrl_tab: 0x%08x, mem_index: 0x%08x\n",
> +			event->event.mem_timeout.err_csr_ctrl,
> +			event->event.mem_timeout.err_csr_data,
> +			event->event.mem_timeout.ctrl_tab,
> +			event->event.mem_timeout.mem_index);
> +		break;
> +	case FAULT_TYPE_REG_RD_TIMEOUT:
> +	case FAULT_TYPE_REG_WR_TIMEOUT:
> +		dev_err(&hwdev->hwif->pdev->dev, "Err_csr: 0x%08x\n",
> +			event->event.reg_timeout.err_csr);
> +		break;
> +	case FAULT_TYPE_PHY_FAULT:
> +		dev_err(&hwdev->hwif->pdev->dev, "Op_type: %u, port_id: %u, dev_ad: %u, csr_addr: 0x%08x, op_data: 0x%08x\n",
> +			event->event.phy_fault.op_type,
> +			event->event.phy_fault.port_id,
> +			event->event.phy_fault.dev_ad,
> +			event->event.phy_fault.csr_addr,
> +			event->event.phy_fault.op_data);
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +
> +/* pf fault report event */
> +static void pf_fault_event_handler(void *hwdev, void *buf_in, u16 in_size,
> +				   void *buf_out, u16 *out_size)
> +{
> +	struct hinic_cmd_fault_event *fault_event = buf_in;
> +
> +	fault_report_show(hwdev, &fault_event->event);
> +}
> +
> +static void mgmt_watchdog_timeout_event_handler(void *dev,
> +						void *buf_in, u16 in_size,
> +						void *buf_out, u16 *out_size)
> +{
> +	struct hinic_mgmt_watchdog_info *watchdog_info = NULL;
> +	struct hinic_hwdev *hwdev = dev;
> +	u32 *dump_addr = NULL;
> +	u32 stack_len, i, j;
> +	u32 *reg = NULL;
> +
> +	if (in_size != sizeof(*watchdog_info)) {
> +		dev_err(&hwdev->hwif->pdev->dev, "Invalid mgmt watchdog report, length: %d, should be %zu\n",
> +			in_size, sizeof(*watchdog_info));
> +		return;
> +	}
> +
> +	watchdog_info = buf_in;
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Mgmt deadloop time: 0x%x 0x%x, task id: 0x%x, sp: 0x%x\n",
> +		watchdog_info->curr_time_h, watchdog_info->curr_time_l,
> +		watchdog_info->task_id, watchdog_info->sp);
> +	dev_err(&hwdev->hwif->pdev->dev, "Stack current used: 0x%x, peak used: 0x%x, overflow flag: 0x%x, top: 0x%x, bottom: 0x%x\n",
> +		watchdog_info->curr_used, watchdog_info->peak_used,
> +		watchdog_info->is_overflow, watchdog_info->stack_top,
> +		watchdog_info->stack_bottom);
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Mgmt pc: 0x%08x, lr: 0x%08x, cpsr:0x%08x\n",
> +		watchdog_info->pc, watchdog_info->lr, watchdog_info->cpsr);
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Mgmt register info\n");
> +
> +	for (i = 0; i < 3; i++) {
> +		reg = watchdog_info->reg + (u64)(u32)(4 * i);
> +		dev_err(&hwdev->hwif->pdev->dev, "0x%08x 0x%08x 0x%08x 0x%08x\n",
> +			*(reg), *(reg + 1), *(reg + 2), *(reg + 3));
> +	}
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "0x%08x\n", watchdog_info->reg[12]);
> +
> +	if (watchdog_info->stack_actlen <= 1024) {
> +		stack_len = watchdog_info->stack_actlen;
> +	} else {
> +		dev_err(&hwdev->hwif->pdev->dev, "Oops stack length: 0x%x is wrong\n",
> +			watchdog_info->stack_actlen);
> +		stack_len = 1024;
> +	}
> +
> +	dev_err(&hwdev->hwif->pdev->dev, "Mgmt dump stack, 16Bytes per line(start from sp)\n");
> +	for (i = 0; i < (stack_len / 16); i++) {
> +		dump_addr = (u32 *)(watchdog_info->data + ((u64)(u32)(i * 16)));
> +		dev_err(&hwdev->hwif->pdev->dev, "0x%08x 0x%08x 0x%08x 0x%08x\n",
> +			*dump_addr, *(dump_addr + 1), *(dump_addr + 2),
> +			*(dump_addr + 3));
> +	}
> +
> +	for (j = 0; j < ((stack_len % 16) / 4); j++) {
> +		dump_addr = (u32 *)(watchdog_info->data +
> +			    ((u64)(u32)(i * 16 + j * 4)));
> +		dev_err(&hwdev->hwif->pdev->dev, "0x%08x ", *dump_addr);
> +	}
> +
> +	*out_size = sizeof(*watchdog_info);
> +	watchdog_info = buf_out;
> +	watchdog_info->status = 0;
> +}

These look like things which should be devlink health reporters.

> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
> index c4c6f9c29f0e..98d2133a268b 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
> @@ -75,6 +75,10 @@ MODULE_PARM_DESC(rx_weight, "Number Rx packets for NAPI budget (default=64)");
>  #define HINIC_DEAULT_TXRX_MSIX_COALESC_TIMER_CFG	32
>  #define HINIC_DEAULT_TXRX_MSIX_RESEND_TIMER_CFG		7
>  
> +static const char *hinic_module_link_err[LINK_ERR_NUM] = {
> +	"Unrecognized module",
> +};
> +
>  static int change_mac_addr(struct net_device *netdev, const u8 *addr);
>  
>  static int set_features(struct hinic_dev *nic_dev,
> @@ -971,6 +975,44 @@ static void link_status_event_handler(void *handle, void *buf_in, u16 in_size,
>  	*out_size = sizeof(*ret_link_status);
>  }
>  
> +static void cable_plug_event(void *handle,
> +			     void *buf_in, u16 in_size,
> +			     void *buf_out, u16 *out_size)
> +{
> +	struct hinic_cable_plug_event *plug_event = buf_in;
> +	struct hinic_dev *nic_dev = handle;
> +
> +	netif_info(nic_dev, link, nic_dev->netdev,
> +		   "Port module event: Cable %s\n",
> +		   plug_event->plugged ? "plugged" : "unplugged");
> +
> +	*out_size = sizeof(*plug_event);
> +	plug_event = buf_out;
> +	plug_event->status = 0;
> +}
> +
> +static void link_err_event(void *handle,
> +			   void *buf_in, u16 in_size,
> +			   void *buf_out, u16 *out_size)
> +{
> +	struct hinic_link_err_event *link_err = buf_in;
> +	struct hinic_dev *nic_dev = handle;
> +
> +	if (link_err->err_type >= LINK_ERR_NUM)
> +		netif_info(nic_dev, link, nic_dev->netdev,
> +			   "Link failed, Unknown error type: 0x%x\n",
> +			   link_err->err_type);
> +	else
> +		netif_info(nic_dev, link, nic_dev->netdev,
> +			   "Link failed, error type: 0x%x: %s\n",
> +			   link_err->err_type,
> +			   hinic_module_link_err[link_err->err_type]);
> +
> +	*out_size = sizeof(*link_err);
> +	link_err = buf_out;
> +	link_err->status = 0;
> +}

Please expose link error information via the infrastructure added in
commit ecc31c60240b ("ethtool: Add link extended state") rather than
printing it to the logs.

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