Re: [RFC net-next 1/3] net: marvell: prestera: Add Switchdev driver for Prestera family ASIC device 98DX325x (AC3x)

[Jiri Pirko]

Fri, Feb 28, 2020 at 09:06:02AM CET, vadym.kochan@xxxxxxxxxxx wrote:
>Hi Jiri,
>
>On Thu, Feb 27, 2020 at 03:22:59PM +0100, Jiri Pirko wrote:
>> Tue, Feb 25, 2020 at 05:30:54PM CET, vadym.kochan@xxxxxxxxxxx wrote:
>> >Marvell Prestera 98DX326x integrates up to 24 ports of 1GbE with 8
>> >ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
>> >wireless SMB deployment.
>> >
>> >This driver implementation includes only L1 & basic L2 support.
>> >
>> >The core Prestera switching logic is implemented in prestera.c, there is
>> >an intermediate hw layer between core logic and firmware. It is
>> >implemented in prestera_hw.c, the purpose of it is to encapsulate hw
>> >related logic, in future there is a plan to support more devices with
>> >different HW related configurations.
>> >
>> >The following Switchdev features are supported:
>> >
>> >    - VLAN-aware bridge offloading
>> >    - VLAN-unaware bridge offloading
>> >    - FDB offloading (learning, ageing)
>> >    - Switchport configuration
>> >
>> >Signed-off-by: Vadym Kochan <vadym.kochan@xxxxxxxxxxx>
>> >Signed-off-by: Andrii Savka <andrii.savka@xxxxxxxxxxx>
>> >Signed-off-by: Oleksandr Mazur <oleksandr.mazur@xxxxxxxxxxx>
>> >Signed-off-by: Serhiy Boiko <serhiy.boiko@xxxxxxxxxxx>
>> >Signed-off-by: Serhiy Pshyk <serhiy.pshyk@xxxxxxxxxxx>
>> >Signed-off-by: Taras Chornyi <taras.chornyi@xxxxxxxxxxx>
>> >Signed-off-by: Volodymyr Mytnyk <volodymyr.mytnyk@xxxxxxxxxxx>
>> >---
>
>[SNIP]
>
>> >+};
>> >+
>> >+struct mvsw_msg_cmd {
>> >+	u32 type;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_ret {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 status;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_common_request {
>> >+	struct mvsw_msg_cmd cmd;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_common_response {
>> >+	struct mvsw_msg_ret ret;
>> >+} __packed __aligned(4);
>> >+
>> >+union mvsw_msg_switch_param {
>> >+	u32 ageing_timeout;
>> >+};
>> >+
>> >+struct mvsw_msg_switch_attr_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	union mvsw_msg_switch_param param;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_switch_init_ret {
>> >+	struct mvsw_msg_ret ret;
>> >+	u32 port_count;
>> >+	u32 mtu_max;
>> >+	u8  switch_id;
>> >+	u8  mac[ETH_ALEN];
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_port_autoneg_param {
>> >+	u64 link_mode;
>> >+	u8  enable;
>> >+	u8  fec;
>> >+};
>> >+
>> >+struct mvsw_msg_port_cap_param {
>> >+	u64 link_mode;
>> >+	u8  type;
>> >+	u8  fec;
>> >+	u8  transceiver;
>> >+};
>> >+
>> >+union mvsw_msg_port_param {
>> >+	u8  admin_state;
>> >+	u8  oper_state;
>> >+	u32 mtu;
>> >+	u8  mac[ETH_ALEN];
>> >+	u8  accept_frm_type;
>> >+	u8  learning;
>> >+	u32 speed;
>> >+	u8  flood;
>> >+	u32 link_mode;
>> >+	u8  type;
>> >+	u8  duplex;
>> >+	u8  fec;
>> >+	u8  mdix;
>> >+	struct mvsw_msg_port_autoneg_param autoneg;
>> >+	struct mvsw_msg_port_cap_param cap;
>> >+};
>> >+
>> >+struct mvsw_msg_port_attr_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 attr;
>> >+	u32 port;
>> >+	u32 dev;
>> >+	union mvsw_msg_port_param param;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_port_attr_ret {
>> >+	struct mvsw_msg_ret ret;
>> >+	union mvsw_msg_port_param param;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_port_stats_ret {
>> >+	struct mvsw_msg_ret ret;
>> >+	u64 stats[MVSW_PORT_CNT_MAX];
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_port_info_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 port;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_port_info_ret {
>> >+	struct mvsw_msg_ret ret;
>> >+	u32 hw_id;
>> >+	u32 dev_id;
>> >+	u16 fp_id;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_vlan_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 port;
>> >+	u32 dev;
>> >+	u16 vid;
>> >+	u8  is_member;
>> >+	u8  is_tagged;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_fdb_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 port;
>> >+	u32 dev;
>> >+	u8  mac[ETH_ALEN];
>> >+	u16 vid;
>> >+	u8  dynamic;
>> >+	u32 flush_mode;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_event {
>> >+	u16 type;
>> >+	u16 id;
>> >+} __packed __aligned(4);
>> >+
>> >+union mvsw_msg_event_fdb_param {
>> >+	u8 mac[ETH_ALEN];
>> >+};
>> >+
>> >+struct mvsw_msg_event_fdb {
>> >+	struct mvsw_msg_event id;
>> >+	u32 port_id;
>> >+	u32 vid;
>> >+	union mvsw_msg_event_fdb_param param;
>> >+} __packed __aligned(4);
>> >+
>> >+union mvsw_msg_event_port_param {
>> >+	u32 oper_state;
>> >+};
>> >+
>> >+struct mvsw_msg_event_port {
>> >+	struct mvsw_msg_event id;
>> >+	u32 port_id;
>> >+	union mvsw_msg_event_port_param param;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_bridge_cmd {
>> >+	struct mvsw_msg_cmd cmd;
>> >+	u32 port;
>> >+	u32 dev;
>> >+	u16 bridge;
>> >+} __packed __aligned(4);
>> >+
>> >+struct mvsw_msg_bridge_ret {
>> >+	struct mvsw_msg_ret ret;
>> >+	u16 bridge;
>> >+} __packed __aligned(4);
>> >+
>> >+#define fw_check_resp(_response)	\
>> >+({								\
>> >+	int __er = 0;						\
>> >+	typeof(_response) __r = (_response);			\
>> >+	if (__r->ret.cmd.type != MVSW_MSG_TYPE_ACK)		\
>> >+		__er = -EBADE;					\
>> >+	else if (__r->ret.status != MVSW_MSG_ACK_OK)		\
>> >+		__er = -EINVAL;					\
>> >+	(__er);							\
>> >+})
>> >+
>> >+#define __fw_send_req_resp(_switch, _type, _request, _response, _wait)	\
>> 
>> Please try to avoid doing functions in macros like this one and the
>> previous one.
>> 
>> 
>> >+({								\
>> >+	int __e;						\
>> >+	typeof(_switch) __sw = (_switch);			\
>> >+	typeof(_request) __req = (_request);			\
>> >+	typeof(_response) __resp = (_response);			\
>> >+	__req->cmd.type = (_type);				\
>> >+	__e = __sw->dev->send_req(__sw->dev,			\
>> >+		(u8 *)__req, sizeof(*__req),			\
>> >+		(u8 *)__resp, sizeof(*__resp),			\
>> >+		_wait);						\
>> >+	if (!__e)						\
>> >+		__e = fw_check_resp(__resp);			\
>> >+	(__e);							\
>> >+})
>> >+
>> >+#define fw_send_req_resp(_sw, _t, _req, _resp)	\
>> >+	__fw_send_req_resp(_sw, _t, _req, _resp, 0)
>> >+
>> >+#define fw_send_req_resp_wait(_sw, _t, _req, _resp, _wait)	\
>> >+	__fw_send_req_resp(_sw, _t, _req, _resp, _wait)
>> >+
>> >+#define fw_send_req(_sw, _t, _req)	\
>> 
>> This should be function, not define
>
>Yeah, I understand your point, but here was the reason:
>
>all packed structs which defined here in prestera_hw.c
>are used for transmission request/return to/from the firmware, each of
>the struct requires to have req/ret member (depends if it is request or
>return from the firmware), and the purpose of the macro is to avoid case
>when someone can forget to add req/ret member to the new such structure.

You should refactor your code to make this cleaner. Define acting as
a function working with random structures counting with 2 member names in
them, that is not nice :/


>
>> 
>> 
>> >+({							\
>> >+	struct mvsw_msg_common_response __re;		\
>> >+	(fw_send_req_resp(_sw, _t, _req, &__re));	\
>> >+})
>> >+
>
>Regards,
>Vadym Kochan,