Re: [PATCH v4 2/7] ethdev: add telemetry cmd for registers

[fengchengwen <fengchengwen@huawei.com>]

Hi Jie,

On 2024/2/26 11:07, Jie Hai wrote:
> This patch adds a telemetry command for registers dump,
> and supports get registers with specified names.
> The length of the string exported by telemetry is limited
> by MAX_OUTPUT_LEN. Therefore, the filter should be more
> precise.
> 
> An example usage is shown below:
> --> /ethdev/regs,0,INTR
> {
>   "/ethdev/regs": {
>     "registers_length": 318,
>     "registers_width": 4,
>     "register_offset": "0x0",
>     "version": "0x1140011",
>     "group_0": {
>       "HNS3_CMDQ_INTR_STS_REG": "0x0",
>       "HNS3_CMDQ_INTR_EN_REG": "0x2",
>       "HNS3_CMDQ_INTR_GEN_REG": "0x0",
>       "queue_0_HNS3_TQP_INTR_CTRL_REG": "0x0",
>       "queue_0_HNS3_TQP_INTR_GL0_REG": "0xa",
>       "queue_0_HNS3_TQP_INTR_GL1_REG": "0xa",
>       "queue_0_HNS3_TQP_INTR_GL2_REG": "0x0",
>       ...
>       },
>     "group_1": {
>         ...
>     },
>     ...
> }
> 
> or as below if the number of registers not exceed the
> RTE_TEL_MAX_DICT_ENTRIES:
> --> /ethdev/regs,0,ppp
> {
>   "/ethdev/regs": {
>     "registers_length": 156,
>     "registers_width": 4,
>     "register_offset": "0x0",
>     "version": "0x1140011",
>     "ppp_key_drop_num": "0x0",
>     "ppp_rlt_drop_num": "0x0",
>     "ssu_ppp_mac_key_num_l": "0x1",
>     "ssu_ppp_mac_key_num_h": "0x0",
>     "ssu_ppp_host_key_num_l": "0x1",
>     "ssu_ppp_host_key_num_h": "0x0",
>     "ppp_ssu_mac_rlt_num_l": "0x1",
>         ...
>    }
> }
> 
> Signed-off-by: Jie Hai <haijie1@huawei.com>
> ---
>  lib/ethdev/rte_ethdev_telemetry.c | 126 ++++++++++++++++++++++++++++++
>  1 file changed, 126 insertions(+)
> 
> diff --git a/lib/ethdev/rte_ethdev_telemetry.c b/lib/ethdev/rte_ethdev_telemetry.c
> index 6b873e7abe68..f1ebb2fae632 100644
> --- a/lib/ethdev/rte_ethdev_telemetry.c
> +++ b/lib/ethdev/rte_ethdev_telemetry.c
> @@ -5,6 +5,7 @@
>  #include <ctype.h>
>  #include <stdlib.h>
>  
> +#include <rte_malloc.h>
>  #include <rte_kvargs.h>
>  #include <rte_telemetry.h>
>  
> @@ -1395,6 +1396,129 @@ eth_dev_handle_port_tm_node_caps(const char *cmd __rte_unused,
>  	return ret;
>  }
>  
> +static int
> +eth_dev_store_regs(struct rte_tel_data *d, struct rte_dev_reg_info *reg_info)
> +{
> +	struct rte_tel_data *groups[RTE_TEL_MAX_DICT_ENTRIES] = {NULL};

no need zero.

> +	char group_name[RTE_TEL_MAX_STRING_LEN] = {0};
> +	struct rte_tel_data *group = NULL;
> +	uint32_t grp_num = 0;
> +	uint32_t *data;
> +	int ret = 0;
> +	uint32_t i;
> +
> +	rte_tel_data_start_dict(d);
> +	rte_tel_data_add_dict_uint(d, "register_length", reg_info->length);
> +	rte_tel_data_add_dict_uint(d, "register_width", reg_info->width);
> +	rte_tel_data_add_dict_uint_hex(d, "register_offset", reg_info->offset, 0);
> +	rte_tel_data_add_dict_uint_hex(d, "version", reg_info->version, 0);
> +
> +	data = reg_info->data;
> +	if (reg_info->length <= RTE_TEL_MAX_DICT_ENTRIES) {
> +		for (i = 0; i < reg_info->length; i++, data++)
> +			rte_tel_data_add_dict_uint_hex(d,
> +				reg_info->names[i].name, *data, 0);

The above format is OK for reg_info->width==4.
There maybe reg_info->width == 8, pls support it.

> +		return 0;
> +	}
> +
> +	for (i = 0; i < reg_info->length; i++, data++) {
> +		if (i % RTE_TEL_MAX_DICT_ENTRIES == 0) {
> +			if (i != 0)
> +				rte_tel_data_add_dict_container(d, group_name,
> +								group, 0);
> +
> +			group = rte_tel_data_alloc();
> +			if (group == NULL) {
> +				ret = -ENOMEM;
> +				goto out;
> +			}
> +			rte_tel_data_start_dict(group);
> +			snprintf(group_name, RTE_TEL_MAX_STRING_LEN,
> +					"group_%u", grp_num);

grp_num + 1 ?

> +			if (grp_num >= RTE_TEL_MAX_DICT_ENTRIES) {
> +				RTE_ETHDEV_LOG_LINE(NOTICE,
> +					"Too many regs, please filter");

how about add more descrip: stop format!

> +				return 0;

this group's memory was leak.

How about move the extream case before for loop:

uint32_t length = reg_info->lenght;
if (length > RTE_TEL_MAX_DICT_ENTRIES * RTE_TEL_MAX_DICT_ENTRIES) {
    LOG(xxx);
    length = RTE_TEL_MAX_DICT_ENTRIES * RTE_TEL_MAX_DICT_ENTRIES;
}

> +			}
> +			groups[grp_num++] = group;
> +		}
> +		rte_tel_data_add_dict_uint_hex(group, reg_info->names[i].name,
> +						*data, 0);
> +	}
> +	if (i % RTE_TEL_MAX_DICT_ENTRIES != 0)
> +		rte_tel_data_add_dict_container(d, group_name, group, 0);

how about move all add dict in here.
for (i = 0; i < grp_num; i++) {
    snprintf(group_name, xxx);
    rte_tel_data_add_dict_container(d, group_name, group[i], 0);
}

> +
> +	return 0;
> +out:
> +	for (i = 0; i < grp_num; i++)
> +		rte_tel_data_free(groups[i]);
> +
> +	return ret;
> +}
> +
> +static int
> +eth_dev_get_port_regs(int port_id, struct rte_tel_data *d, char *filter)
> +{
> +	struct rte_dev_reg_info reg_info;
> +	int ret;
> +
> +	memset(&reg_info, 0, sizeof(reg_info));
> +	reg_info.filter = filter;
> +
> +	ret = rte_eth_dev_get_reg_info_ext(port_id, &reg_info);
> +	if (ret != 0) {
> +		RTE_ETHDEV_LOG_LINE(ERR,
> +			"Error getting device reg info: %d", ret);
> +		return ret;
> +	}
> +
> +	reg_info.data = calloc(reg_info.length, reg_info.width);
> +	if (!reg_info.data)

pls use if (reg_info.data == NULL), and add error log

> +		return -ENOMEM;
> +
> +	reg_info.names = calloc(reg_info.length, sizeof(struct rte_eth_reg_name));
> +	if (!reg_info.names) {

pls use if (reg_info.names == NULL), and add error log

> +		free(reg_info.data);
> +		return -ENOMEM;
> +	}
> +
> +	ret = rte_eth_dev_get_reg_info_ext(port_id, &reg_info);
> +	if (ret != 0) {
> +		RTE_ETHDEV_LOG_LINE(ERR,
> +			"Error getting regs from device: %d", ret);
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	ret = eth_dev_store_regs(d, &reg_info);
> +out:
> +	free(reg_info.data);
> +	free(reg_info.names);
> +
> +	return ret;
> +}
> +
> +static int
> +eth_dev_handle_port_regs(const char *cmd __rte_unused,
> +		const char *params,
> +		struct rte_tel_data *d)
> +{
> +	char *filter = NULL;
> +	uint16_t port_id;
> +	char *end_param;
> +	int ret;
> +
> +	ret = eth_dev_parse_port_params(params, &port_id, &end_param, true);
> +	if (ret != 0)
> +		return ret;
> +
> +	filter = strtok(end_param, ",");
> +	if (filter != NULL && strlen(filter) == 0)
> +		filter = NULL;
> +
> +	return eth_dev_get_port_regs(port_id, d, filter);
> +}
> +
>  RTE_INIT(ethdev_init_telemetry)
>  {
>  	rte_telemetry_register_cmd("/ethdev/list", eth_dev_handle_port_list,
> @@ -1436,4 +1560,6 @@ RTE_INIT(ethdev_init_telemetry)
>  			"Returns TM Level Capabilities info for a port. Parameters: int port_id, int level_id (see tm_capability for the max)");
>  	rte_telemetry_register_cmd("/ethdev/tm_node_capability", eth_dev_handle_port_tm_node_caps,
>  			"Returns TM Node Capabilities info for a port. Parameters: int port_id, int node_id (see tm_capability for the max)");
> +	rte_telemetry_register_cmd("/ethdev/regs", eth_dev_handle_port_regs,
> +			"Returns regs for a port. Parameters: int port_id, string filter");
>  }
>