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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel IFC VF NIC driver for virtio dataplane offloading
*
* Copyright (C) 2020 Intel Corporation.
*
* Author: Zhu Lingshan <lingshan.zhu@intel.com>
*
*/
#include "ifcvf_base.h"
static inline u8 ifc_ioread8(u8 __iomem *addr)
{
return ioread8(addr);
}
static inline u16 ifc_ioread16 (__le16 __iomem *addr)
{
return ioread16(addr);
}
static inline u32 ifc_ioread32(__le32 __iomem *addr)
{
return ioread32(addr);
}
static inline void ifc_iowrite8(u8 value, u8 __iomem *addr)
{
iowrite8(value, addr);
}
static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr)
{
iowrite16(value, addr);
}
static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr)
{
iowrite32(value, addr);
}
static void ifc_iowrite64_twopart(u64 val,
__le32 __iomem *lo, __le32 __iomem *hi)
{
ifc_iowrite32((u32)val, lo);
ifc_iowrite32(val >> 32, hi);
}
struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
{
return container_of(hw, struct ifcvf_adapter, vf);
}
static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
struct virtio_pci_cap *cap)
{
struct ifcvf_adapter *ifcvf;
struct pci_dev *pdev;
u32 length, offset;
u8 bar;
length = le32_to_cpu(cap->length);
offset = le32_to_cpu(cap->offset);
bar = cap->bar;
ifcvf= vf_to_adapter(hw);
pdev = ifcvf->pdev;
if (bar >= IFCVF_PCI_MAX_RESOURCE) {
IFCVF_DBG(pdev,
"Invalid bar number %u to get capabilities\n", bar);
return NULL;
}
if (offset + length > pci_resource_len(pdev, bar)) {
IFCVF_DBG(pdev,
"offset(%u) + len(%u) overflows bar%u's capability\n",
offset, length, bar);
return NULL;
}
return hw->base[bar] + offset;
}
static int ifcvf_read_config_range(struct pci_dev *dev,
uint32_t *val, int size, int where)
{
int ret, i;
for (i = 0; i < size; i += 4) {
ret = pci_read_config_dword(dev, where + i, val + i / 4);
if (ret < 0)
return ret;
}
return 0;
}
int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
{
struct virtio_pci_cap cap;
u16 notify_off;
int ret;
u8 pos;
u32 i;
ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
if (ret < 0) {
IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
return -EIO;
}
while (pos) {
ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
sizeof(cap), pos);
if (ret < 0) {
IFCVF_ERR(pdev,
"Failed to get PCI capability at %x\n", pos);
break;
}
if (cap.cap_vndr != PCI_CAP_ID_VNDR)
goto next;
switch (cap.cfg_type) {
case VIRTIO_PCI_CAP_COMMON_CFG:
hw->common_cfg = get_cap_addr(hw, &cap);
IFCVF_DBG(pdev, "hw->common_cfg = %p\n",
hw->common_cfg);
break;
case VIRTIO_PCI_CAP_NOTIFY_CFG:
pci_read_config_dword(pdev, pos + sizeof(cap),
&hw->notify_off_multiplier);
hw->notify_bar = cap.bar;
hw->notify_base = get_cap_addr(hw, &cap);
IFCVF_DBG(pdev, "hw->notify_base = %p\n",
hw->notify_base);
break;
case VIRTIO_PCI_CAP_ISR_CFG:
hw->isr = get_cap_addr(hw, &cap);
IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr);
break;
case VIRTIO_PCI_CAP_DEVICE_CFG:
hw->net_cfg = get_cap_addr(hw, &cap);
IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg);
break;
}
next:
pos = cap.cap_next;
}
if (hw->common_cfg == NULL || hw->notify_base == NULL ||
hw->isr == NULL || hw->net_cfg == NULL) {
IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
return -EIO;
}
for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
ifc_iowrite16(i, &hw->common_cfg->queue_select);
notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off);
hw->vring[i].notify_addr = hw->notify_base +
notify_off * hw->notify_off_multiplier;
}
hw->lm_cfg = hw->base[IFCVF_LM_BAR];
IFCVF_DBG(pdev,
"PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
hw->common_cfg, hw->notify_base, hw->isr,
hw->net_cfg, hw->notify_off_multiplier);
return 0;
}
u8 ifcvf_get_status(struct ifcvf_hw *hw)
{
return ifc_ioread8(&hw->common_cfg->device_status);
}
void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
{
ifc_iowrite8(status, &hw->common_cfg->device_status);
}
void ifcvf_reset(struct ifcvf_hw *hw)
{
hw->config_cb.callback = NULL;
hw->config_cb.private = NULL;
ifcvf_set_status(hw, 0);
/* flush set_status, make sure VF is stopped, reset */
ifcvf_get_status(hw);
}
static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
{
if (status != 0)
status |= ifcvf_get_status(hw);
ifcvf_set_status(hw, status);
ifcvf_get_status(hw);
}
u64 ifcvf_get_features(struct ifcvf_hw *hw)
{
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
u32 features_lo, features_hi;
ifc_iowrite32(0, &cfg->device_feature_select);
features_lo = ifc_ioread32(&cfg->device_feature);
ifc_iowrite32(1, &cfg->device_feature_select);
features_hi = ifc_ioread32(&cfg->device_feature);
return ((u64)features_hi << 32) | features_lo;
}
void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
void *dst, int length)
{
u8 old_gen, new_gen, *p;
int i;
WARN_ON(offset + length > sizeof(struct virtio_net_config));
do {
old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
p = dst;
for (i = 0; i < length; i++)
*p++ = ifc_ioread8(hw->net_cfg + offset + i);
new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
} while (old_gen != new_gen);
}
void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
const void *src, int length)
{
const u8 *p;
int i;
p = src;
WARN_ON(offset + length > sizeof(struct virtio_net_config));
for (
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