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Mengyuan Loukuba-moo
Mengyuan Lou
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kuba-moo
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net: libwx: Add mailbox api for wangxun pf drivers
Implements the mailbox interfaces for wangxun pf drivers ngbe and txgbe. Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com> Link: https://patch.msgid.link/70017BD4D67614A4+20250408091556.9640-2-mengyuanlou@net-swift.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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‎drivers/net/ethernet/wangxun/libwx/Makefile‎

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Original file line numberDiff line numberDiff line change
@@ -4,4 +4,4 @@
44

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obj-$(CONFIG_LIBWX) += libwx.o
66

7-
libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o
7+
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

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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */
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#include <linux/pci.h>
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#include "wx_type.h"
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#include "wx_mbx.h"
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/**
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* wx_obtain_mbx_lock_pf - obtain mailbox lock
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* @wx: pointer to the HW structure
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* @vf: the VF index
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*
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* Return: return 0 on success and -EBUSY on failure
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**/
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static int wx_obtain_mbx_lock_pf(struct wx *wx, u16 vf)
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{
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int count = 5;
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u32 mailbox;
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while (count--) {
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/* Take ownership of the buffer */
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wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_PFU);
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/* reserve mailbox for vf use */
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mailbox = rd32(wx, WX_PXMAILBOX(vf));
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if (mailbox & WX_PXMAILBOX_PFU)
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return 0;
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else if (count)
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udelay(10);
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}
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wx_err(wx, "Failed to obtain mailbox lock for PF%d", vf);
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return -EBUSY;
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}
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static int wx_check_for_bit_pf(struct wx *wx, u32 mask, int index)
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{
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u32 mbvficr = rd32(wx, WX_MBVFICR(index));
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if (!(mbvficr & mask))
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return -EBUSY;
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wr32(wx, WX_MBVFICR(index), mask);
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return 0;
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}
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/**
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* wx_check_for_ack_pf - checks to see if the VF has acked
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* @wx: pointer to the HW structure
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* @vf: the VF index
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*
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* Return: return 0 if the VF has set the status bit or else -EBUSY
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**/
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int wx_check_for_ack_pf(struct wx *wx, u16 vf)
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{
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u32 index = vf / 16, vf_bit = vf % 16;
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return wx_check_for_bit_pf(wx,
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FIELD_PREP(WX_MBVFICR_VFACK_MASK,
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BIT(vf_bit)),
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index);
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}
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/**
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* wx_check_for_msg_pf - checks to see if the VF has sent mail
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* @wx: pointer to the HW structure
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* @vf: the VF index
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*
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* Return: return 0 if the VF has got req bit or else -EBUSY
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**/
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int wx_check_for_msg_pf(struct wx *wx, u16 vf)
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{
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u32 index = vf / 16, vf_bit = vf % 16;
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return wx_check_for_bit_pf(wx,
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FIELD_PREP(WX_MBVFICR_VFREQ_MASK,
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BIT(vf_bit)),
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index);
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}
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/**
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* wx_write_mbx_pf - Places a message in the mailbox
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* @wx: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @vf: the VF index
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*
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* Return: return 0 on success and -EINVAL/-EBUSY on failure
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**/
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int wx_write_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)
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{
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struct wx_mbx_info *mbx = &wx->mbx;
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int ret, i;
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/* mbx->size is up to 15 */
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if (size > mbx->size) {
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wx_err(wx, "Invalid mailbox message size %d", size);
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return -EINVAL;
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}
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/* lock the mailbox to prevent pf/vf race condition */
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ret = wx_obtain_mbx_lock_pf(wx, vf);
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if (ret)
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return ret;
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/* flush msg and acks as we are overwriting the message buffer */
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wx_check_for_msg_pf(wx, vf);
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wx_check_for_ack_pf(wx, vf);
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/* copy the caller specified message to the mailbox memory buffer */
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for (i = 0; i < size; i++)
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wr32a(wx, WX_PXMBMEM(vf), i, msg[i]);
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/* Interrupt VF to tell it a message has been sent and release buffer */
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/* set mirrored mailbox flags */
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wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_STS);
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wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_STS);
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return 0;
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}
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/**
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* wx_read_mbx_pf - Read a message from the mailbox
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* @wx: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @vf: the VF index
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*
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* Return: return 0 on success and -EBUSY on failure
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**/
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int wx_read_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)
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{
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struct wx_mbx_info *mbx = &wx->mbx;
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int ret;
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u16 i;
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/* limit read to size of mailbox and mbx->size is up to 15 */
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if (size > mbx->size)
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size = mbx->size;
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/* lock the mailbox to prevent pf/vf race condition */
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ret = wx_obtain_mbx_lock_pf(wx, vf);
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if (ret)
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return ret;
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for (i = 0; i < size; i++)
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msg[i] = rd32a(wx, WX_PXMBMEM(vf), i);
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/* Acknowledge the message and release buffer */
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/* set mirrored mailbox flags */
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wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_ACK);
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wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_ACK);
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return 0;
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}
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/**
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* wx_check_for_rst_pf - checks to see if the VF has reset
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* @wx: pointer to the HW structure
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* @vf: the VF index
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*
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* Return: return 0 on success and -EBUSY on failure
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**/
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int wx_check_for_rst_pf(struct wx *wx, u16 vf)
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{
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u32 reg_offset = WX_VF_REG_OFFSET(vf);
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u32 vf_shift = WX_VF_IND_SHIFT(vf);
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u32 vflre = 0;
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vflre = rd32(wx, WX_VFLRE(reg_offset));
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if (!(vflre & BIT(vf_shift)))
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return -EBUSY;
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wr32(wx, WX_VFLREC(reg_offset), BIT(vf_shift));
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return 0;
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}

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

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@@ -0,0 +1,32 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */
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#ifndef _WX_MBX_H_
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#define _WX_MBX_H_
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#define WX_VXMAILBOX_SIZE 15
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/* PF Registers */
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#define WX_PXMAILBOX(i) (0x600 + (4 * (i))) /* i=[0,63] */
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#define WX_PXMAILBOX_STS BIT(0) /* Initiate message send to VF */
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#define WX_PXMAILBOX_ACK BIT(1) /* Ack message recv'd from VF */
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#define WX_PXMAILBOX_PFU BIT(3) /* PF owns the mailbox buffer */
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#define WX_PXMBMEM(i) (0x5000 + (64 * (i))) /* i=[0,63] */
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#define WX_VFLRE(i) (0x4A0 + (4 * (i))) /* i=[0,1] */
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#define WX_VFLREC(i) (0x4A8 + (4 * (i))) /* i=[0,1] */
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/* SR-IOV specific macros */
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#define WX_MBVFICR(i) (0x480 + (4 * (i))) /* i=[0,3] */
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#define WX_MBVFICR_VFREQ_MASK GENMASK(15, 0)
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#define WX_MBVFICR_VFACK_MASK GENMASK(31, 16)
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#define WX_VT_MSGINFO_MASK GENMASK(23, 16)
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int wx_write_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf);
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int wx_read_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf);
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int wx_check_for_rst_pf(struct wx *wx, u16 mbx_id);
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int wx_check_for_msg_pf(struct wx *wx, u16 mbx_id);
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int wx_check_for_ack_pf(struct wx *wx, u16 mbx_id);
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#endif /* _WX_MBX_H_ */

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

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Original file line numberDiff line numberDiff line change
@@ -22,6 +22,9 @@
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#define WX_PCI_LINK_STATUS 0xB2
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/**************** Global Registers ****************************/
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#define WX_VF_REG_OFFSET(_v) FIELD_GET(GENMASK(15, 5), (_v))
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#define WX_VF_IND_SHIFT(_v) FIELD_GET(GENMASK(4, 0), (_v))
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/* chip control Registers */
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#define WX_MIS_PWR 0x10000
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#define WX_MIS_RST 0x1000C
@@ -779,6 +782,10 @@ struct wx_bus_info {
779782
u16 device;
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};
781784

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struct wx_mbx_info {
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u16 size;
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};
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struct wx_thermal_sensor_data {
783790
s16 temp;
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s16 alarm_thresh;
@@ -1129,6 +1136,7 @@ struct wx {
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struct pci_dev *pdev;
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struct net_device *netdev;
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struct wx_bus_info bus;
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struct wx_mbx_info mbx;
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struct wx_mac_info mac;
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enum em_mac_type mac_type;
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enum sp_media_type media_type;

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