linux-kernel - Re: [PATCH net-next v2 1/3] net: lan966x: Add function lan966x_mac_ip

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Date:   Tue, 4 Jan 2022 11:17:10 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCH net-next v2 1/3] net: lan966x: Add function
 lan966x_mac_ip_learn()

On Tue, Jan 04, 2022 at 11:18:47AM +0100, Horatiu Vultur wrote:
> Extend mac functionality with the function lan966x_mac_ip_learn. This
> function adds an entry in the MAC table for IP multicast addresses.
> These entries can copy a frame to the CPU but also can forward on the
> front ports.
> This functionality is needed for mdb support. In case the CPU and some
> of the front ports subscribe to an IP multicast address.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  .../ethernet/microchip/lan966x/lan966x_mac.c  | 33 ++++++++++++++++---
>  .../ethernet/microchip/lan966x/lan966x_main.h |  5 +++
>  .../ethernet/microchip/lan966x/lan966x_regs.h |  6 ++++
>  3 files changed, 39 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
> index efadb8d326cc..82eb6606e17f 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
> @@ -68,17 +68,19 @@ static void lan966x_mac_select(struct lan966x *lan966x,
>  	lan_wr(mach, lan966x, ANA_MACHDATA);
>  }
>  
> -int lan966x_mac_learn(struct lan966x *lan966x, int port,
> -		      const unsigned char mac[ETH_ALEN],
> -		      unsigned int vid,
> -		      enum macaccess_entry_type type)
> +static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
> +			       bool cpu_copy,
> +			       const unsigned char mac[ETH_ALEN],
> +			       unsigned int vid,
> +			       enum macaccess_entry_type type)
>  {
>  	lan966x_mac_select(lan966x, mac, vid);
>  
>  	/* Issue a write command */
>  	lan_wr(ANA_MACACCESS_VALID_SET(1) |
>  	       ANA_MACACCESS_CHANGE2SW_SET(0) |
> -	       ANA_MACACCESS_DEST_IDX_SET(port) |
> +	       ANA_MACACCESS_MAC_CPU_COPY_SET(cpu_copy) |
> +	       ANA_MACACCESS_DEST_IDX_SET(pgid) |
>  	       ANA_MACACCESS_ENTRYTYPE_SET(type) |
>  	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN),
>  	       lan966x, ANA_MACACCESS);
> @@ -86,6 +88,27 @@ int lan966x_mac_learn(struct lan966x *lan966x, int port,
>  	return lan966x_mac_wait_for_completion(lan966x);
>  }
>  
> +int lan966x_mac_ip_learn(struct lan966x *lan966x,
> +			 bool cpu_copy,
> +			 const unsigned char mac[ETH_ALEN],
> +			 unsigned int vid,
> +			 enum macaccess_entry_type type)

I think it's worth mentioning in a comment above this function that the
mask of front ports should be encoded into the address by now, via a
call to lan966x_mdb_encode_mac().

> +{
> +	WARN_ON(type != ENTRYTYPE_MACV4 && type != ENTRYTYPE_MACV6);
> +
> +	return __lan966x_mac_learn(lan966x, 0, cpu_copy, mac, vid, type);
> +}
> +
> +int lan966x_mac_learn(struct lan966x *lan966x, int port,
> +		      const unsigned char mac[ETH_ALEN],
> +		      unsigned int vid,
> +		      enum macaccess_entry_type type)
> +{
> +	WARN_ON(type != ENTRYTYPE_NORMAL && type != ENTRYTYPE_LOCKED);
> +
> +	return __lan966x_mac_learn(lan966x, port, false, mac, vid, type);
> +}
> +
>  int lan966x_mac_forget(struct lan966x *lan966x,
>  		       const unsigned char mac[ETH_ALEN],
>  		       unsigned int vid,
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
> index c399b1256edc..f70e54526f53 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
> @@ -157,6 +157,11 @@ int lan966x_port_pcs_set(struct lan966x_port *port,
>  			 struct lan966x_port_config *config);
>  void lan966x_port_init(struct lan966x_port *port);
>  
> +int lan966x_mac_ip_learn(struct lan966x *lan966x,
> +			 bool cpu_copy,
> +			 const unsigned char mac[ETH_ALEN],
> +			 unsigned int vid,
> +			 enum macaccess_entry_type type);
>  int lan966x_mac_learn(struct lan966x *lan966x, int port,
>  		      const unsigned char mac[ETH_ALEN],
>  		      unsigned int vid,
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
> index a13c469e139a..797560172aca 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
> @@ -169,6 +169,12 @@ enum lan966x_target {
>  #define ANA_MACACCESS_CHANGE2SW_GET(x)\
>  	FIELD_GET(ANA_MACACCESS_CHANGE2SW, x)
>  
> +#define ANA_MACACCESS_MAC_CPU_COPY               BIT(16)
> +#define ANA_MACACCESS_MAC_CPU_COPY_SET(x)\
> +	FIELD_PREP(ANA_MACACCESS_MAC_CPU_COPY, x)
> +#define ANA_MACACCESS_MAC_CPU_COPY_GET(x)\
> +	FIELD_GET(ANA_MACACCESS_MAC_CPU_COPY, x)

Could you please add a space between (x) and \.

> +
>  #define ANA_MACACCESS_VALID                      BIT(12)
>  #define ANA_MACACCESS_VALID_SET(x)\
>  	FIELD_PREP(ANA_MACACCESS_VALID, x)
> -- 
> 2.33.0
>