Commit 29264a37 authored by Mengyuan Lou's avatar Mengyuan Lou Committed by Jakub Kicinski
Browse files

net: libwx: Add mailbox api for wangxun pf drivers 



Implements the mailbox interfaces for wangxun pf drivers
ngbe and txgbe.

Signed-off-by: default avatarMengyuan Lou <mengyuanlou@net-swift.com>
Link: https://patch.msgid.link/70017BD4D67614A4+20250408091556.9640-2-mengyuanlou@net-swift.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 6a07e3af

drivers/net/ethernet/wangxun/libwx/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -4,4 +4,4 @@ 


obj-$(CONFIG_LIBWX) += libwx.o



libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o
 
libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o wx_mbx.o

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

0 → 100644
+176 −0
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// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */



#include <linux/pci.h>

#include "wx_type.h"

#include "wx_mbx.h"



/**

 *  wx_obtain_mbx_lock_pf - obtain mailbox lock

 *  @wx: pointer to the HW structure

 *  @vf: the VF index

 *

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

 **/

static int wx_obtain_mbx_lock_pf(struct wx *wx, u16 vf)

{

	int count = 5;

	u32 mailbox;



	while (count--) {

		/* Take ownership of the buffer */

		wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_PFU);



		/* reserve mailbox for vf use */

		mailbox = rd32(wx, WX_PXMAILBOX(vf));

		if (mailbox & WX_PXMAILBOX_PFU)

			return 0;

		else if (count)

			udelay(10);

	}

	wx_err(wx, "Failed to obtain mailbox lock for PF%d", vf);



	return -EBUSY;

}



static int wx_check_for_bit_pf(struct wx *wx, u32 mask, int index)

{

	u32 mbvficr = rd32(wx, WX_MBVFICR(index));



	if (!(mbvficr & mask))

		return -EBUSY;

	wr32(wx, WX_MBVFICR(index), mask);



	return 0;

}



/**

 *  wx_check_for_ack_pf - checks to see if the VF has acked

 *  @wx: pointer to the HW structure

 *  @vf: the VF index

 *

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

 **/

int wx_check_for_ack_pf(struct wx *wx, u16 vf)

{

	u32 index = vf / 16, vf_bit = vf % 16;



	return wx_check_for_bit_pf(wx,

				   FIELD_PREP(WX_MBVFICR_VFACK_MASK,

					      BIT(vf_bit)),

				   index);

}



/**

 *  wx_check_for_msg_pf - checks to see if the VF has sent mail

 *  @wx: pointer to the HW structure

 *  @vf: the VF index

 *

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

 **/

int wx_check_for_msg_pf(struct wx *wx, u16 vf)

{

	u32 index = vf / 16, vf_bit = vf % 16;



	return wx_check_for_bit_pf(wx,

				   FIELD_PREP(WX_MBVFICR_VFREQ_MASK,

					      BIT(vf_bit)),

				   index);

}



/**

 *  wx_write_mbx_pf - Places a message in the mailbox

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *  @vf: the VF index

 *

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

 **/

int wx_write_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)

{

	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_pf(wx, vf);

	if (ret)

		return ret;



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

	wx_check_for_msg_pf(wx, vf);

	wx_check_for_ack_pf(wx, vf);



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

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

		wr32a(wx, WX_PXMBMEM(vf), i, msg[i]);



	/* Interrupt VF to tell it a message has been sent and release buffer */

	/* set mirrored mailbox flags */

	wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_STS);

	wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_STS);



	return 0;

}



/**

 *  wx_read_mbx_pf - Read a message from the mailbox

 *  @wx: pointer to the HW structure

 *  @msg: The message buffer

 *  @size: Length of buffer

 *  @vf: the VF index

 *

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

 **/

int wx_read_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)

{

	struct wx_mbx_info *mbx = &wx->mbx;

	int ret;

	u16 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_pf(wx, vf);

	if (ret)

		return ret;



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

		msg[i] = rd32a(wx, WX_PXMBMEM(vf), i);



	/* Acknowledge the message and release buffer */

	/* set mirrored mailbox flags */

	wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_ACK);

	wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_ACK);



	return 0;

}



/**

 *  wx_check_for_rst_pf - checks to see if the VF has reset

 *  @wx: pointer to the HW structure

 *  @vf: the VF index

 *

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

 **/

int wx_check_for_rst_pf(struct wx *wx, u16 vf)

{

	u32 reg_offset = WX_VF_REG_OFFSET(vf);

	u32 vf_shift = WX_VF_IND_SHIFT(vf);

	u32 vflre = 0;



	vflre = rd32(wx, WX_VFLRE(reg_offset));

	if (!(vflre & BIT(vf_shift)))

		return -EBUSY;

	wr32(wx, WX_VFLREC(reg_offset), BIT(vf_shift));



	return 0;

}

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

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+32 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */

#ifndef _WX_MBX_H_

#define _WX_MBX_H_



#define WX_VXMAILBOX_SIZE    15



/* PF Registers */

#define WX_PXMAILBOX(i)      (0x600 + (4 * (i))) /* i=[0,63] */

#define WX_PXMAILBOX_STS     BIT(0) /* Initiate message send to VF */

#define WX_PXMAILBOX_ACK     BIT(1) /* Ack message recv'd from VF */

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



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



#define WX_VFLRE(i)          (0x4A0 + (4 * (i))) /* i=[0,1] */

#define WX_VFLREC(i)         (0x4A8 + (4 * (i))) /* i=[0,1] */



/* SR-IOV specific macros */

#define WX_MBVFICR(i)         (0x480 + (4 * (i))) /* i=[0,3] */

#define WX_MBVFICR_VFREQ_MASK GENMASK(15, 0)

#define WX_MBVFICR_VFACK_MASK GENMASK(31, 16)



#define WX_VT_MSGINFO_MASK    GENMASK(23, 16)



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

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

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);



#endif /* _WX_MBX_H_ */

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

+8 −0
Original line number Diff line number Diff line
@@ -22,6 +22,9 @@ 
#define WX_PCI_LINK_STATUS                      0xB2



/**************** Global Registers ****************************/

#define WX_VF_REG_OFFSET(_v)         FIELD_GET(GENMASK(15, 5), (_v))

#define WX_VF_IND_SHIFT(_v)          FIELD_GET(GENMASK(4, 0), (_v))



/* chip control Registers */

#define WX_MIS_PWR                   0x10000

#define WX_MIS_RST                   0x1000C
@@ -779,6 +782,10 @@ struct wx_bus_info { 
	u16 device;

};



struct wx_mbx_info {

	u16 size;

};



struct wx_thermal_sensor_data {

	s16 temp;

	s16 alarm_thresh;
@@ -1129,6 +1136,7 @@ struct wx { 
	struct pci_dev *pdev;

	struct net_device *netdev;

	struct wx_bus_info bus;

	struct wx_mbx_info mbx;

	struct wx_mac_info mac;

	enum em_mac_type mac_type;

	enum sp_media_type media_type;