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/*
* Copyright (C) 2016 Cavium, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include "cptvf.h"
static void cptvf_send_msg_to_pf(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
{
/* Writing mbox(1) causes interrupt */
cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0),
mbx->msg);
cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1),
mbx->data);
}
/* ACKs PF's mailbox message
*/
void cptvf_mbox_send_ack(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
{
mbx->msg = CPT_MBOX_MSG_TYPE_ACK;
cptvf_send_msg_to_pf(cptvf, mbx);
}
/* NACKs PF's mailbox message that VF is not able to
* complete the action
*/
void cptvf_mbox_send_nack(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
{
mbx->msg = CPT_MBOX_MSG_TYPE_NACK;
cptvf_send_msg_to_pf(cptvf, mbx);
}
/* Interrupt handler to handle mailbox messages from VFs */
void cptvf_handle_mbox_intr(struct cpt_vf *cptvf)
{
struct cpt_mbox mbx = {};
/*
* MBOX[0] contains msg
* MBOX[1] contains data
*/
mbx.msg = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0));
mbx.data = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1));
dev_dbg(&cptvf->pdev->dev, "%s: Mailbox msg 0x%llx from PF\n",
__func__, mbx.msg);
switch (mbx.msg) {
case CPT_MSG_READY:
{
cptvf->pf_acked = true;
cptvf->vfid = mbx.data;
dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
break;
}
case 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 == SE_TYPES) ? "SE" : "AE"),
cptvf->vfgrp);
break;
case CPT_MBOX_MSG_TYPE_ACK:
cptvf->pf_acked = true;
break;
case CPT_MBOX_MSG_TYPE_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 cpt_vf *cptvf,
struct 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 & 0xFF), 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 cptvf_check_pf_ready(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_READY;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to READY msg\n");
return -EBUSY;
}
return 0;
}
/*
* Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
* Must be ACKed.
*/
int cptvf_send_vq_size_msg(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_QLEN;
mbx.data = cptvf->qsize;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to vq_size msg\n");
return -EBUSY;
}
return 0;
}
/*
* Communicate VF group required to PF and get the VQ binded to that group
*/
int cptvf_send_vf_to_grp_msg(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_QBIND_GRP;
/* Convey group of the VF */
mbx.data = cptvf->vfgrp;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
return -EBUSY;
}
return 0;
}
/*
* Communicate VF group required to PF and get the VQ binded to that group
*/
int cptvf_send_vf_priority_msg(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_VQ_PRIORITY;
/* Convey group of the VF */
mbx.data = cptvf->priority;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
return -EBUSY;
}
return 0;
}
/*
* Communicate to PF that VF is UP and running
*/
int cptvf_send_vf_up(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_VF_UP;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to UP msg\n");
return -EBUSY;
}
return 0;
}
/*
* Communicate to PF that VF is DOWN and running
*/
int cptvf_send_vf_down(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
struct cpt_mbox mbx = {};
mbx.msg = CPT_MSG_VF_DOWN;
if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
dev_err(&pdev->dev, "PF didn't respond to DOWN msg\n");
return -EBUSY;
}
return 0;
}
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