Commit 8259946e authored by Mengyuan Lou's avatar Mengyuan Lou Committed by Jakub Kicinski
Browse files

net: libwx: add mailbox api for wangxun vf drivers 



Implements the mailbox interfaces for Wangxun vf drivers which
will be used in txgbevf and ngbevf.

Signed-off-by: default avatarMengyuan Lou <mengyuanlou@net-swift.com>
Link: https://patch.msgid.link/20250704094923.652-2-mengyuanlou@net-swift.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 6a971e48

drivers/net/ethernet/wangxun/libwx/wx_mbx.c

+243 −0
Original line number Diff line number Diff line
@@ -174,3 +174,246 @@ int wx_check_for_rst_pf(struct wx *wx, u16 vf) 


	return 0;

}



static u32 wx_read_v2p_mailbox(struct wx *wx)

{

	u32 mailbox = rd32(wx, WX_VXMAILBOX);



	mailbox |= wx->mbx.mailbox;

	wx->mbx.mailbox |= mailbox & WX_VXMAILBOX_R2C_BITS;



	return mailbox;

}



static u32 wx_mailbox_get_lock_vf(struct wx *wx)

{

	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_VFU);

	return wx_read_v2p_mailbox(wx);

}



/**

 *  wx_obtain_mbx_lock_vf - obtain mailbox lock

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 on success and -EBUSY on failure

 **/

static int wx_obtain_mbx_lock_vf(struct wx *wx)

{

	int count = 5, ret;

	u32 mailbox;



	ret = readx_poll_timeout_atomic(wx_mailbox_get_lock_vf, wx, mailbox,

					(mailbox & WX_VXMAILBOX_VFU),

					1, count);

	if (ret)

		wx_err(wx, "Failed to obtain mailbox lock for VF.\n");



	return ret;

}



static int wx_check_for_bit_vf(struct wx *wx, u32 mask)

{

	u32 mailbox = wx_read_v2p_mailbox(wx);



	wx->mbx.mailbox &= ~mask;



	return (mailbox & mask ? 0 : -EBUSY);

}



/**

 *  wx_check_for_ack_vf - checks to see if the PF has ACK'd

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 if the PF has set the status bit or else -EBUSY

 **/

static int wx_check_for_ack_vf(struct wx *wx)

{

	/* read clear the pf ack bit */

	return wx_check_for_bit_vf(wx, WX_VXMAILBOX_PFACK);

}



/**

 *  wx_check_for_msg_vf - checks to see if the PF has sent mail

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 if the PF has got req bit or else -EBUSY

 **/

int wx_check_for_msg_vf(struct wx *wx)

{

	/* read clear the pf sts bit */

	return wx_check_for_bit_vf(wx, WX_VXMAILBOX_PFSTS);

}



/**

 *  wx_check_for_rst_vf - checks to see if the PF has reset

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 if the PF has set the reset done and -EBUSY on failure

 **/

int wx_check_for_rst_vf(struct wx *wx)

{

	/* read clear the pf reset done bit */

	return wx_check_for_bit_vf(wx,

				   WX_VXMAILBOX_RSTD |

				   WX_VXMAILBOX_RSTI);

}



/**

 *  wx_poll_for_msg - Wait for message notification

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 if the VF has successfully received a message notification

 **/

static int wx_poll_for_msg(struct wx *wx)

{

	struct wx_mbx_info *mbx = &wx->mbx;

	u32 val;



	return readx_poll_timeout_atomic(wx_check_for_msg_vf, wx, val,

					 (val == 0), mbx->udelay, mbx->timeout);

}



/**

 *  wx_poll_for_ack - Wait for message acknowledgment

 *  @wx: pointer to the HW structure

 *

 *  Return: return 0 if the VF has successfully received a message ack

 **/

static int wx_poll_for_ack(struct wx *wx)

{

	struct wx_mbx_info *mbx = &wx->mbx;

	u32 val;



	return readx_poll_timeout_atomic(wx_check_for_ack_vf, wx, val,

					 (val == 0), mbx->udelay, mbx->timeout);

}



/**

 *  wx_read_posted_mbx - Wait for message notification and receive message

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *

 *  Return: returns 0 if it successfully received a message notification and

 *  copied it into the receive buffer.

 **/

int wx_read_posted_mbx(struct wx *wx, u32 *msg, u16 size)

{

	int ret;



	ret = wx_poll_for_msg(wx);

	/* if ack received read message, otherwise we timed out */

	if (ret)

		return ret;



	return wx_read_mbx_vf(wx, msg, size);

}



/**

 *  wx_write_posted_mbx - Write a message to the mailbox, wait for ack

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *

 *  Return: returns 0 if it successfully copied message into the buffer and

 *  received an ack to that message within delay * timeout period

 **/

int wx_write_posted_mbx(struct wx *wx, u32 *msg, u16 size)

{

	int ret;



	/* send msg */

	ret = wx_write_mbx_vf(wx, msg, size);

	/* if msg sent wait until we receive an ack */

	if (ret)

		return ret;



	return wx_poll_for_ack(wx);

}



/**

 *  wx_write_mbx_vf - Write a message to the mailbox

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *

 *  Return: returns 0 if it successfully copied message into the buffer

 **/

int wx_write_mbx_vf(struct wx *wx, u32 *msg, u16 size)

{

	struct wx_mbx_info *mbx = &wx->mbx;

	int ret, i;



	/* mbx->size is up to 15 */

	if (size > mbx->size) {

		wx_err(wx, "Invalid mailbox message size %d", size);

		return -EINVAL;

	}



	/* lock the mailbox to prevent pf/vf race condition */

	ret = wx_obtain_mbx_lock_vf(wx);

	if (ret)

		return ret;



	/* flush msg and acks as we are overwriting the message buffer */

	wx_check_for_msg_vf(wx);

	wx_check_for_ack_vf(wx);



	/* copy the caller specified message to the mailbox memory buffer */

	for (i = 0; i < size; i++)

		wr32a(wx, WX_VXMBMEM, i, msg[i]);



	/* Drop VFU and interrupt the PF to tell it a message has been sent */

	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_REQ);



	return 0;

}



/**

 *  wx_read_mbx_vf - Reads a message from the inbox intended for vf

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *

 *  Return: returns 0 if it successfully copied message into the buffer

 **/

int wx_read_mbx_vf(struct wx *wx, u32 *msg, u16 size)

{

	struct wx_mbx_info *mbx = &wx->mbx;

	int ret, i;



	/* limit read to size of mailbox and mbx->size is up to 15 */

	if (size > mbx->size)

		size = mbx->size;



	/* lock the mailbox to prevent pf/vf race condition */

	ret = wx_obtain_mbx_lock_vf(wx);

	if (ret)

		return ret;



	/* copy the message from the mailbox memory buffer */

	for (i = 0; i < size; i++)

		msg[i] = rd32a(wx, WX_VXMBMEM, i);



	/* Acknowledge receipt and release mailbox, then we're done */

	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_ACK);



	return 0;

}



int wx_init_mbx_params_vf(struct wx *wx)

{

	wx->vfinfo = kzalloc(sizeof(struct vf_data_storage),

			     GFP_KERNEL);

	if (!wx->vfinfo)

		return -ENOMEM;



	/* Initialize mailbox parameters */

	wx->mbx.size = WX_VXMAILBOX_SIZE;

	wx->mbx.mailbox = WX_VXMAILBOX;

	wx->mbx.udelay = 10;

	wx->mbx.timeout = 1000;



	return 0;

}

EXPORT_SYMBOL(wx_init_mbx_params_vf);

drivers/net/ethernet/wangxun/libwx/wx_mbx.h

+22 −0
Original line number Diff line number Diff line
@@ -11,6 +11,20 @@ 
#define WX_PXMAILBOX_ACK     BIT(1) /* Ack message recv'd from VF */

#define WX_PXMAILBOX_PFU     BIT(3) /* PF owns the mailbox buffer */



/* VF Registers */

#define WX_VXMAILBOX         0x600

#define WX_VXMAILBOX_REQ     BIT(0) /* Request for PF Ready bit */

#define WX_VXMAILBOX_ACK     BIT(1) /* Ack PF message received */

#define WX_VXMAILBOX_VFU     BIT(2) /* VF owns the mailbox buffer */

#define WX_VXMAILBOX_PFU     BIT(3) /* PF owns the mailbox buffer */

#define WX_VXMAILBOX_PFSTS   BIT(4) /* PF wrote a message in the MB */

#define WX_VXMAILBOX_PFACK   BIT(5) /* PF ack the previous VF msg */

#define WX_VXMAILBOX_RSTI    BIT(6) /* PF has reset indication */

#define WX_VXMAILBOX_RSTD    BIT(7) /* PF has indicated reset done */

#define WX_VXMAILBOX_R2C_BITS (WX_VXMAILBOX_RSTD | \

	    WX_VXMAILBOX_PFSTS | WX_VXMAILBOX_PFACK)



#define WX_VXMBMEM           0x00C00 /* 16*4B */

#define WX_PXMBMEM(i)        (0x5000 + (64 * (i))) /* i=[0,63] */



#define WX_VFLRE(i)          (0x4A0 + (4 * (i))) /* i=[0,1] */
@@ -74,4 +88,12 @@ int wx_check_for_rst_pf(struct wx *wx, u16 mbx_id); 
int wx_check_for_msg_pf(struct wx *wx, u16 mbx_id);

int wx_check_for_ack_pf(struct wx *wx, u16 mbx_id);



int wx_read_posted_mbx(struct wx *wx, u32 *msg, u16 size);

int wx_write_posted_mbx(struct wx *wx, u32 *msg, u16 size);

int wx_check_for_rst_vf(struct wx *wx);

int wx_check_for_msg_vf(struct wx *wx);

int wx_read_mbx_vf(struct wx *wx, u32 *msg, u16 size);

int wx_write_mbx_vf(struct wx *wx, u32 *msg, u16 size);

int wx_init_mbx_params_vf(struct wx *wx);



#endif /* _WX_MBX_H_ */

drivers/net/ethernet/wangxun/libwx/wx_type.h

+3 −0
Original line number Diff line number Diff line
@@ -825,6 +825,9 @@ struct wx_bus_info { 


struct wx_mbx_info {

	u16 size;

	u32 mailbox;

	u32 udelay;

	u32 timeout;

};



struct wx_thermal_sensor_data {