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/*
* Huawei HiNIC PCI Express Linux driver
* Copyright(c) 2017 Huawei Technologies Co., Ltd
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include "hinic_hw_if.h"
#include "hinic_hw_dev.h"
#define MAX_IRQS(max_qps, num_aeqs, num_ceqs) \
(2 * (max_qps) + (num_aeqs) + (num_ceqs))
/**
* init_msix - enable the msix and save the entries
* @hwdev: the NIC HW device
*
* Return 0 - Success, negative - Failure
**/
static int init_msix(struct hinic_hwdev *hwdev)
{
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
int nr_irqs, num_aeqs, num_ceqs;
size_t msix_entries_size;
int i, err;
num_aeqs = HINIC_HWIF_NUM_AEQS(hwif);
num_ceqs = HINIC_HWIF_NUM_CEQS(hwif);
nr_irqs = MAX_IRQS(HINIC_MAX_QPS, num_aeqs, num_ceqs);
if (nr_irqs > HINIC_HWIF_NUM_IRQS(hwif))
nr_irqs = HINIC_HWIF_NUM_IRQS(hwif);
msix_entries_size = nr_irqs * sizeof(*hwdev->msix_entries);
hwdev->msix_entries = devm_kzalloc(&pdev->dev, msix_entries_size,
GFP_KERNEL);
if (!hwdev->msix_entries)
return -ENOMEM;
for (i = 0; i < nr_irqs; i++)
hwdev->msix_entries[i].entry = i;
err = pci_enable_msix_exact(pdev, hwdev->msix_entries, nr_irqs);
if (err) {
dev_err(&pdev->dev, "Failed to enable pci msix\n");
return err;
}
return 0;
}
/**
* disable_msix - disable the msix
* @hwdev: the NIC HW device
**/
static void disable_msix(struct hinic_hwdev *hwdev)
{
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
pci_disable_msix(pdev);
}
/**
* init_pfhwdev - Initialize the extended components of PF
* @pfhwdev: the HW device for PF
*
* Return 0 - success, negative - failure
**/
static int init_pfhwdev(struct hinic_pfhwdev *pfhwdev)
{
/* Initialize PF HW device extended components */
return 0;
}
/**
* free_pfhwdev - Free the extended components of PF
* @pfhwdev: the HW device for PF
**/
static void free_pfhwdev(struct hinic_pfhwdev *pfhwdev)
{
}
/**
* hinic_init_hwdev - Initialize the NIC HW
* @pdev: the NIC pci device
*
* Return initialized NIC HW device
*
* Initialize the NIC HW device and return a pointer to it
**/
struct hinic_hwdev *hinic_init_hwdev(struct pci_dev *pdev)
{
struct hinic_pfhwdev *pfhwdev;
struct hinic_hwdev *hwdev;
struct hinic_hwif *hwif;
int err;
hwif = devm_kzalloc(&pdev->dev, sizeof(*hwif), GFP_KERNEL);
if (!hwif)
return ERR_PTR(-ENOMEM);
err = hinic_init_hwif(hwif, pdev);
if (err) {
dev_err(&pdev->dev, "Failed to init HW interface\n");
return ERR_PTR(err);
}
if (!HINIC_IS_PF(hwif) && !HINIC_IS_PPF(hwif)) {
dev_err(&pdev->dev, "Unsupported PCI Function type\n");
err = -EFAULT;
goto err_func_type;
}
pfhwdev = devm_kzalloc(&pdev->dev, sizeof(*pfhwdev), GFP_KERNEL);
if (!pfhwdev) {
err = -ENOMEM;
goto err_pfhwdev_alloc;
}
hwdev = &pfhwdev->hwdev;
hwdev->hwif = hwif;
err = init_msix(hwdev);
if (err) {
dev_err(&pdev->dev, "Failed to init msix\n");
goto err_init_msix;
}
err = init_pfhwdev(pfhwdev);
if (err) {
dev_err(&pdev->dev, "Failed to init PF HW device\n");
goto err_init_pfhwdev;
}
return hwdev;
err_init_pfhwdev:
disable_msix(hwdev);
err_init_msix:
err_pfhwdev_alloc:
err_func_type:
hinic_free_hwif(hwif);
return ERR_PTR(err);
}
/**
* hinic_free_hwdev - Free the NIC HW device
* @hwdev: the NIC HW device
**/
void hinic_free_hwdev(struct hinic_hwdev *hwdev)
{
struct hinic_pfhwdev *pfhwdev = container_of(hwdev,
struct hinic_pfhwdev,
hwdev);
free_pfhwdev(pfhwdev);
disable_msix(hwdev);
hinic_free_hwif(hwdev->hwif);
}
/**
* hinic_hwdev_num_qps - return the number QPs available for use
* @hwdev: the NIC HW device
*
* Return number QPs available for use
**/
int hinic_hwdev_num_qps(struct hinic_hwdev *hwdev)
{
int num_aeqs, num_ceqs, nr_irqs, num_qps;
num_aeqs = HINIC_HWIF_NUM_AEQS(hwdev->hwif);
num_ceqs = HINIC_HWIF_NUM_CEQS(hwdev->hwif);
nr_irqs = HINIC_HWIF_NUM_IRQS(hwdev->hwif);
/* Each QP has its own (SQ + RQ) interrupt */
num_qps = (nr_irqs - (num_aeqs + num_ceqs)) / 2;
/* num_qps must be power of 2 */
return BIT(fls(num_qps) - 1);
}
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