linux-kernel - Re: [PATCH net-next v2 1/6] net: marvell: prestera: add virtual router ABI

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Date:   Thu, 30 Dec 2021 15:41:21 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Yevhen Orlov <yevhen.orlov@...ision.eu>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org, andrew@...n.ch,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/6] net: marvell: prestera: add virtual
 router ABI

On Mon, Dec 27, 2021 at 11:52:26PM +0200, Yevhen Orlov wrote:
> Add functions and structures to allocate virtual router.
> prestera_hw_vr_create() return index of allocated VR so that we can move

s/return/returns/

> forward and also add another objects (e.g. router interface),
> which has link to VR.
> 
> Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
> Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
> Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
> ---
> v1-->v2
> * No changes
> ---
>  .../ethernet/marvell/prestera/prestera_hw.c   | 42 +++++++++++++++++++
>  .../ethernet/marvell/prestera/prestera_hw.h   |  4 ++
>  2 files changed, 46 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> index 6282c9822e2b..8783adbad593 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> @@ -53,6 +53,9 @@ enum prestera_cmd_type_t {
>  	PRESTERA_CMD_TYPE_VTCAM_IFACE_BIND = 0x560,
>  	PRESTERA_CMD_TYPE_VTCAM_IFACE_UNBIND = 0x561,
>  
> +	PRESTERA_CMD_TYPE_ROUTER_VR_CREATE = 0x630,
> +	PRESTERA_CMD_TYPE_ROUTER_VR_DELETE = 0x631,
> +
>  	PRESTERA_CMD_TYPE_RXTX_INIT = 0x800,
>  
>  	PRESTERA_CMD_TYPE_LAG_MEMBER_ADD = 0x900,
> @@ -480,6 +483,18 @@ struct prestera_msg_rxtx_resp {
>  	__le32 map_addr;
>  };
>  
> +struct prestera_msg_vr_req {
> +	struct prestera_msg_cmd cmd;
> +	__le16 vr_id;
> +	u8 __pad[2];
> +};
> +
> +struct prestera_msg_vr_resp {
> +	struct prestera_msg_ret ret;
> +	__le16 vr_id;
> +	u8 __pad[2];
> +};
> +
>  struct prestera_msg_lag_req {
>  	struct prestera_msg_cmd cmd;
>  	__le32 port;
> @@ -549,6 +564,7 @@ static void prestera_hw_build_tests(void)
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_acl_action) != 32);
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_counter_req) != 16);
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_counter_stats) != 16);
> +	BUILD_BUG_ON(sizeof(struct prestera_msg_vr_req) != 8);
>  
>  	/* check responses */
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_common_resp) != 8);
> @@ -561,6 +577,7 @@ static void prestera_hw_build_tests(void)
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_rxtx_resp) != 12);
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_vtcam_resp) != 16);
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_counter_resp) != 24);
> +	BUILD_BUG_ON(sizeof(struct prestera_msg_vr_resp) != 12);
>  
>  	/* check events */
>  	BUILD_BUG_ON(sizeof(struct prestera_msg_event_port) != 20);
> @@ -1752,6 +1769,31 @@ int prestera_hw_bridge_port_delete(struct prestera_port *port, u16 bridge_id)
>  			    &req.cmd, sizeof(req));
>  }
>  
> +int prestera_hw_vr_create(struct prestera_switch *sw, u16 *vr_id)
> +{
> +	int err;
> +	struct prestera_msg_vr_resp resp;
> +	struct prestera_msg_vr_req req;

Order local variables from longest to shortest (reverse xmas tree), so
'int err' should be at the end. Same in other places I might have missed

> +
> +	err = prestera_cmd_ret(sw, PRESTERA_CMD_TYPE_ROUTER_VR_CREATE,
> +			       &req.cmd, sizeof(req), &resp.ret, sizeof(resp));
> +	if (err)
> +		return err;
> +
> +	*vr_id = __le16_to_cpu(resp.vr_id);
> +	return err;
> +}
> +
> +int prestera_hw_vr_delete(struct prestera_switch *sw, u16 vr_id)
> +{
> +	struct prestera_msg_vr_req req = {
> +		.vr_id = __cpu_to_le16(vr_id),
> +	};
> +
> +	return prestera_cmd(sw, PRESTERA_CMD_TYPE_ROUTER_VR_DELETE, &req.cmd,
> +			    sizeof(req));
> +}
> +
>  int prestera_hw_rxtx_init(struct prestera_switch *sw,
>  			  struct prestera_rxtx_params *params)
>  {
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_hw.h b/drivers/net/ethernet/marvell/prestera/prestera_hw.h
> index 0496e454e148..6d9fafad451d 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_hw.h
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_hw.h
> @@ -238,6 +238,10 @@ int prestera_hw_span_bind(const struct prestera_port *port, u8 span_id);
>  int prestera_hw_span_unbind(const struct prestera_port *port);
>  int prestera_hw_span_release(struct prestera_switch *sw, u8 span_id);
>  
> +/* Virtual Router API */
> +int prestera_hw_vr_create(struct prestera_switch *sw, u16 *vr_id);
> +int prestera_hw_vr_delete(struct prestera_switch *sw, u16 vr_id);
> +
>  /* Event handlers */
>  int prestera_hw_event_handler_register(struct prestera_switch *sw,
>  				       enum prestera_event_type type,
> -- 
> 2.17.1
>