otx_cptvf_mbox.c

// SPDX-License-Identifier: GPL-2.0
/* Marvell OcteonTX CPT driver
 *
 * Copyright (C) 2019 Marvell International Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include "otx_cptvf.h"

#define CPT_MBOX_MSG_TIMEOUT 2000

static char *get_mbox_opcode_str(int msg_opcode)
{
	char *str = "Unknown";

	switch (msg_opcode) {
	case OTX_CPT_MSG_VF_UP:
		str = "UP";
		break;

	case OTX_CPT_MSG_VF_DOWN:
		str = "DOWN";
		break;

	case OTX_CPT_MSG_READY:
		str = "READY";
		break;

	case OTX_CPT_MSG_QLEN:
		str = "QLEN";
		break;

	case OTX_CPT_MSG_QBIND_GRP:
		str = "QBIND_GRP";
		break;

	case OTX_CPT_MSG_VQ_PRIORITY:
		str = "VQ_PRIORITY";
		break;

	case OTX_CPT_MSG_PF_TYPE:
		str = "PF_TYPE";
		break;

	case OTX_CPT_MSG_ACK:
		str = "ACK";
		break;

	case OTX_CPT_MSG_NACK:
		str = "NACK";
		break;
	}
	return str;
}

static void dump_mbox_msg(struct otx_cpt_mbox *mbox_msg, int vf_id)
{
	char raw_data_str[OTX_CPT_MAX_MBOX_DATA_STR_SIZE];

	hex_dump_to_buffer(mbox_msg, sizeof(struct otx_cpt_mbox), 16, 8,
			   raw_data_str, OTX_CPT_MAX_MBOX_DATA_STR_SIZE, false);
	if (vf_id >= 0)
		pr_debug("MBOX msg %s received from VF%d raw_data %s",
			 get_mbox_opcode_str(mbox_msg->msg), vf_id,
			 raw_data_str);
	else
		pr_debug("MBOX msg %s received from PF raw_data %s",
			 get_mbox_opcode_str(mbox_msg->msg), raw_data_str);
}

static void cptvf_send_msg_to_pf(struct otx_cptvf *cptvf,
				     struct otx_cpt_mbox *mbx)
{
	/* Writing mbox(1) causes interrupt */
	writeq(mbx->msg, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
	writeq(mbx->data, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
}

/* Interrupt handler to handle mailbox messages from VFs */
void otx_cptvf_handle_mbox_intr(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	/*
	 * MBOX[0] contains msg
	 * MBOX[1] contains data
	 */
	mbx.msg  = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
	mbx.data = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));

	dump_mbox_msg(&mbx, -1);

	switch (mbx.msg) {
	case OTX_CPT_MSG_VF_UP:
		cptvf->pf_acked = true;
		cptvf->num_vfs = mbx.data;
		break;
	case OTX_CPT_MSG_READY:
		cptvf->pf_acked = true;
		cptvf->vfid = mbx.data;
		dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
		break;
	case OTX_CPT_MSG_QBIND_GRP:
		cptvf->pf_acked = true;
		cptvf->vftype = mbx.data;
		dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",
			cptvf->vfid,
			((mbx.data == OTX_CPT_SE_TYPES) ? "SE" : "AE"),
			cptvf->vfgrp);
		break;
	case OTX_CPT_MSG_ACK:
		cptvf->pf_acked = true;
		break;
	case OTX_CPT_MSG_NACK:
		cptvf->pf_nacked = true;
		break;
	default:
		dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",
			mbx.msg);
		break;
	}
}

static int cptvf_send_msg_to_pf_timeout(struct otx_cptvf *cptvf,
					struct otx_cpt_mbox *mbx)
{
	int timeout = CPT_MBOX_MSG_TIMEOUT;
	int sleep = 10;

	cptvf->pf_acked = false;
	cptvf->pf_nacked = false;
	cptvf_send_msg_to_pf(cptvf, mbx);
	/* Wait for previous message to be acked, timeout 2sec */
	while (!cptvf->pf_acked) {
		if (cptvf->pf_nacked)
			return -EINVAL;
		msleep(sleep);
		if (cptvf->pf_acked)
			break;
		timeout -= sleep;
		if (!timeout) {
			dev_err(&cptvf->pdev->dev,
				"PF didn't ack to mbox msg %llx from VF%u\n",
				mbx->msg, cptvf->vfid);
			return -EBUSY;
		}
	}
	return 0;
}

/*
 * Checks if VF is able to comminicate with PF
 * and also gets the CPT number this VF is associated to.
 */
int otx_cptvf_check_pf_ready(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	mbx.msg = OTX_CPT_MSG_READY;

	return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}

/*
 * Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
 * Must be ACKed.
 */
int otx_cptvf_send_vq_size_msg(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	mbx.msg = OTX_CPT_MSG_QLEN;
	mbx.data = cptvf->qsize;

	return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}

/*
 * Communicate VF group required to PF and get the VQ binded to that group
 */
int otx_cptvf_send_vf_to_grp_msg(struct otx_cptvf *cptvf, int group)
{
	struct otx_cpt_mbox mbx = {};
	int ret;

	mbx.msg = OTX_CPT_MSG_QBIND_GRP;
	/* Convey group of the VF */
	mbx.data = group;
	ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
	if (ret)
		return ret;
	cptvf->vfgrp = group;

	return 0;
}

/*
 * Communicate VF group required to PF and get the VQ binded to that group
 */
int otx_cptvf_send_vf_priority_msg(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	mbx.msg = OTX_CPT_MSG_VQ_PRIORITY;
	/* Convey group of the VF */
	mbx.data = cptvf->priority;

	return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}

/*
 * Communicate to PF that VF is UP and running
 */
int otx_cptvf_send_vf_up(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	mbx.msg = OTX_CPT_MSG_VF_UP;

	return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}

/*
 * Communicate to PF that VF is DOWN and running
 */
int otx_cptvf_send_vf_down(struct otx_cptvf *cptvf)
{
	struct otx_cpt_mbox mbx = {};

	mbx.msg = OTX_CPT_MSG_VF_DOWN;

	return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}