netdev - Re: [PATCH net-next 2/3] ice: add i2c write command

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Date:   Thu, 19 May 2022 15:40:29 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>, davem@...emloft.net,
        kuba@...nel.org, edumazet@...gle.com
Cc:     Karol Kolacinski <karol.kolacinski@...el.com>,
        netdev@...r.kernel.org, richardcochran@...il.com,
        Gurucharan <gurucharanx.g@...el.com>
Subject: Re: [PATCH net-next 2/3] ice: add i2c write command

On Tue, 2022-05-17 at 14:19 -0700, Tony Nguyen wrote:
> From: Karol Kolacinski <karol.kolacinski@...el.com>
> 
> Add the possibility to write to connected i2c devices using the AQ
> command. FW may reject the write if the device is not on allowlist.
> 
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
>  .../net/ethernet/intel/ice/ice_adminq_cmd.h   |  7 +--
>  drivers/net/ethernet/intel/ice/ice_common.c   | 51 ++++++++++++++++++-
>  drivers/net/ethernet/intel/ice/ice_common.h   |  4 ++
>  3 files changed, 58 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> index b25e27c4d887..bedc19f12cbd 100644
> --- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> +++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
> @@ -1401,7 +1401,7 @@ struct ice_aqc_get_link_topo {
>  	u8 rsvd[9];
>  };
>  
> -/* Read I2C (direct, 0x06E2) */
> +/* Read/Write I2C (direct, 0x06E2/0x06E3) */
>  struct ice_aqc_i2c {
>  	struct ice_aqc_link_topo_addr topo_addr;
>  	__le16 i2c_addr;
> @@ -1411,7 +1411,7 @@ struct ice_aqc_i2c {
>  
>  	u8 rsvd;
>  	__le16 i2c_bus_addr;
> -	u8 rsvd2[4];
> +	u8 i2c_data[4]; /* Used only by write command, reserved in read. */
>  };
>  
>  /* Read I2C Response (direct, 0x06E2) */
> @@ -2130,7 +2130,7 @@ struct ice_aq_desc {
>  		struct ice_aqc_get_link_status get_link_status;
>  		struct ice_aqc_event_lan_overflow lan_overflow;
>  		struct ice_aqc_get_link_topo get_link_topo;
> -		struct ice_aqc_i2c read_i2c;
> +		struct ice_aqc_i2c read_write_i2c;
>  		struct ice_aqc_read_i2c_resp read_i2c_resp;
>  	} params;
>  };
> @@ -2247,6 +2247,7 @@ enum ice_adminq_opc {
>  	ice_aqc_opc_set_mac_lb				= 0x0620,
>  	ice_aqc_opc_get_link_topo			= 0x06E0,
>  	ice_aqc_opc_read_i2c				= 0x06E2,
> +	ice_aqc_opc_write_i2c				= 0x06E3,
>  	ice_aqc_opc_set_port_id_led			= 0x06E9,
>  	ice_aqc_opc_set_gpio				= 0x06EC,
>  	ice_aqc_opc_get_gpio				= 0x06ED,
> diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
> index 9619bdb9e49a..1999c19a786e 100644
> --- a/drivers/net/ethernet/intel/ice/ice_common.c
> +++ b/drivers/net/ethernet/intel/ice/ice_common.c
> @@ -4823,7 +4823,7 @@ ice_aq_read_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
>  	int status;
>  
>  	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_read_i2c);
> -	cmd = &desc.params.read_i2c;
> +	cmd = &desc.params.read_write_i2c;
>  
>  	if (!data)
>  		return -EINVAL;
> @@ -4850,6 +4850,55 @@ ice_aq_read_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
>  	return status;
>  }
>  
> +/**
> + * ice_aq_write_i2c
> + * @hw: pointer to the hw struct
> + * @topo_addr: topology address for a device to communicate with
> + * @bus_addr: 7-bit I2C bus address
> + * @addr: I2C memory address (I2C offset) with up to 16 bits
> + * @params: I2C parameters: bit [4] - I2C address type, bits [3:0] - data size to write (0-7 bytes)
> + * @data: pointer to data (0 to 4 bytes) to be written to the I2C device
> + * @cd: pointer to command details structure or NULL
> + *
> + * Write I2C (0x06E3)
> + *
> + * * Return:
> + * * 0             - Successful write to the i2c device
> + * * -EINVAL       - Data size greater than 4 bytes
> + * * -EIO          - FW error
> + */
> +int
> +ice_aq_write_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
> +		 u16 bus_addr, __le16 addr, u8 params, u8 *data,
> +		 struct ice_sq_cd *cd)
> +{
> +	struct ice_aq_desc desc = { 0 };
> +	struct ice_aqc_i2c *cmd;
> +	unsigned int i;
> +	u8 data_size;
> +
> +	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_write_i2c);
> +	cmd = &desc.params.read_write_i2c;
> +
> +	data_size = FIELD_GET(ICE_AQC_I2C_DATA_SIZE_M, params);
> +
> +	/* data_size limited to 4 */
> +	if (data_size > 4)
> +		return -EINVAL;
> +
> +	cmd->i2c_bus_addr = cpu_to_le16(bus_addr);
> +	cmd->topo_addr = topo_addr;
> +	cmd->i2c_params = params;
> +	cmd->i2c_addr = addr;
> +
> +	for (i = 0; i < data_size; i++) {
> +		cmd->i2c_data[i] = *data;
> +		data++;
> +	}

Why not:
	memcpy(cmd->i2c_data, data, data_size);

	?

Thanks!

Paolo