394 lines
9.3 KiB
C
394 lines
9.3 KiB
C
|
// 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"
|
||
|
|
|
||
|
|
u16 ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector)
|
||
|
|
{
|
||
|
|
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
|
||
|
|
|
||
|
|
vp_iowrite16(qid, &cfg->queue_select);
|
||
|
|
vp_iowrite16(vector, &cfg->queue_msix_vector);
|
||
|
|
|
||
|
|
return vp_ioread16(&cfg->queue_msix_vector);
|
||
|
|
}
|
||
|
|
|
||
|
|
u16 ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector)
|
||
|
|
{
|
||
|
|
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
|
||
|
|
|
||
|
|
vp_iowrite16(vector, &cfg->msix_config);
|
||
|
|
|
||
|
|
return vp_ioread16(&cfg->msix_config);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
|
||
|
|
struct virtio_pci_cap *cap)
|
||
|
|
{
|
||
|
|
u32 length, offset;
|
||
|
|
u8 bar;
|
||
|
|
|
||
|
|
length = le32_to_cpu(cap->length);
|
||
|
|
offset = le32_to_cpu(cap->offset);
|
||
|
|
bar = cap->bar;
|
||
|
|
|
||
|
|
if (bar >= IFCVF_PCI_MAX_RESOURCE) {
|
||
|
|
IFCVF_DBG(hw->pdev,
|
||
|
|
"Invalid bar number %u to get capabilities\n", bar);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (offset + length > pci_resource_len(hw->pdev, bar)) {
|
||
|
|
IFCVF_DBG(hw->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;
|
||
|
|
}
|
||
|
|
hw->pdev = pdev;
|
||
|
|
|
||
|
|
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);
|
||
|
|
hw->notify_base_pa = pci_resource_start(pdev, cap.bar) +
|
||
|
|
le32_to_cpu(cap.offset);
|
||
|
|
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->dev_cfg = get_cap_addr(hw, &cap);
|
||
|
|
hw->cap_dev_config_size = le32_to_cpu(cap.length);
|
||
|
|
IFCVF_DBG(pdev, "hw->dev_cfg = %p\n", hw->dev_cfg);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
next:
|
||
|
|
pos = cap.cap_next;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hw->common_cfg == NULL || hw->notify_base == NULL ||
|
||
|
|
hw->isr == NULL || hw->dev_cfg == NULL) {
|
||
|
|
IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
hw->nr_vring = vp_ioread16(&hw->common_cfg->num_queues);
|
||
|
|
|
||
|
|
for (i = 0; i < hw->nr_vring; i++) {
|
||
|
|
vp_iowrite16(i, &hw->common_cfg->queue_select);
|
||
|
|
notify_off = vp_ioread16(&hw->common_cfg->queue_notify_off);
|
||
|
|
hw->vring[i].notify_addr = hw->notify_base +
|
||
|
|
notify_off * hw->notify_off_multiplier;
|
||
|
|
hw->vring[i].notify_pa = hw->notify_base_pa +
|
||
|
|
notify_off * hw->notify_off_multiplier;
|
||
|
|
hw->vring[i].irq = -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
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->dev_cfg, hw->notify_off_multiplier);
|
||
|
|
|
||
|
|
hw->vqs_reused_irq = -EINVAL;
|
||
|
|
hw->config_irq = -EINVAL;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
u8 ifcvf_get_status(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
return vp_ioread8(&hw->common_cfg->device_status);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
|
||
|
|
{
|
||
|
|
vp_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_hw_features(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
|
||
|
|
u32 features_lo, features_hi;
|
||
|
|
u64 features;
|
||
|
|
|
||
|
|
vp_iowrite32(0, &cfg->device_feature_select);
|
||
|
|
features_lo = vp_ioread32(&cfg->device_feature);
|
||
|
|
|
||
|
|
vp_iowrite32(1, &cfg->device_feature_select);
|
||
|
|
features_hi = vp_ioread32(&cfg->device_feature);
|
||
|
|
|
||
|
|
features = ((u64)features_hi << 32) | features_lo;
|
||
|
|
|
||
|
|
return features;
|
||
|
|
}
|
||
|
|
|
||
|
|
u64 ifcvf_get_features(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
return hw->dev_features;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
|
||
|
|
{
|
||
|
|
if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
|
||
|
|
IFCVF_ERR(hw->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
u32 ifcvf_get_config_size(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
u32 net_config_size = sizeof(struct virtio_net_config);
|
||
|
|
u32 blk_config_size = sizeof(struct virtio_blk_config);
|
||
|
|
u32 cap_size = hw->cap_dev_config_size;
|
||
|
|
u32 config_size;
|
||
|
|
|
||
|
|
/* If the onboard device config space size is greater than
|
||
|
|
* the size of struct virtio_net/blk_config, only the spec
|
||
|
|
* implementing contents size is returned, this is very
|
||
|
|
* unlikely, defensive programming.
|
||
|
|
*/
|
||
|
|
switch (hw->dev_type) {
|
||
|
|
case VIRTIO_ID_NET:
|
||
|
|
config_size = min(cap_size, net_config_size);
|
||
|
|
break;
|
||
|
|
case VIRTIO_ID_BLOCK:
|
||
|
|
config_size = min(cap_size, blk_config_size);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
config_size = 0;
|
||
|
|
IFCVF_ERR(hw->pdev, "VIRTIO ID %u not supported\n", hw->dev_type);
|
||
|
|
}
|
||
|
|
|
||
|
|
return config_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset,
|
||
|
|
void *dst, int length)
|
||
|
|
{
|
||
|
|
u8 old_gen, new_gen, *p;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
WARN_ON(offset + length > hw->config_size);
|
||
|
|
do {
|
||
|
|
old_gen = vp_ioread8(&hw->common_cfg->config_generation);
|
||
|
|
p = dst;
|
||
|
|
for (i = 0; i < length; i++)
|
||
|
|
*p++ = vp_ioread8(hw->dev_cfg + offset + i);
|
||
|
|
|
||
|
|
new_gen = vp_ioread8(&hw->common_cfg->config_generation);
|
||
|
|
} while (old_gen != new_gen);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ifcvf_write_dev_config(struct ifcvf_hw *hw, u64 offset,
|
||
|
|
const void *src, int length)
|
||
|
|
{
|
||
|
|
const u8 *p;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
p = src;
|
||
|
|
WARN_ON(offset + length > hw->config_size);
|
||
|
|
for (i = 0; i < length; i++)
|
||
|
|
vp_iowrite8(*p++, hw->dev_cfg + offset + i);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
|
||
|
|
{
|
||
|
|
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
|
||
|
|
|
||
|
|
vp_iowrite32(0, &cfg->guest_feature_select);
|
||
|
|
vp_iowrite32((u32)features, &cfg->guest_feature);
|
||
|
|
|
||
|
|
vp_iowrite32(1, &cfg->guest_feature_select);
|
||
|
|
vp_iowrite32(features >> 32, &cfg->guest_feature);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ifcvf_config_features(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
ifcvf_set_features(hw, hw->req_features);
|
||
|
|
ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
|
||
|
|
|
||
|
|
if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
|
||
|
|
IFCVF_ERR(hw->pdev, "Failed to set FEATURES_OK status\n");
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
|
||
|
|
{
|
||
|
|
struct ifcvf_lm_cfg __iomem *ifcvf_lm;
|
||
|
|
void __iomem *avail_idx_addr;
|
||
|
|
u16 last_avail_idx;
|
||
|
|
u32 q_pair_id;
|
||
|
|
|
||
|
|
ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
|
||
|
|
q_pair_id = qid / 2;
|
||
|
|
avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
|
||
|
|
last_avail_idx = vp_ioread16(avail_idx_addr);
|
||
|
|
|
||
|
|
return last_avail_idx;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
|
||
|
|
{
|
||
|
|
struct ifcvf_lm_cfg __iomem *ifcvf_lm;
|
||
|
|
void __iomem *avail_idx_addr;
|
||
|
|
u32 q_pair_id;
|
||
|
|
|
||
|
|
ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
|
||
|
|
q_pair_id = qid / 2;
|
||
|
|
avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
|
||
|
|
hw->vring[qid].last_avail_idx = num;
|
||
|
|
vp_iowrite16(num, avail_idx_addr);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ifcvf_hw_enable(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
struct virtio_pci_common_cfg __iomem *cfg;
|
||
|
|
u32 i;
|
||
|
|
|
||
|
|
cfg = hw->common_cfg;
|
||
|
|
for (i = 0; i < hw->nr_vring; i++) {
|
||
|
|
if (!hw->vring[i].ready)
|
||
|
|
break;
|
||
|
|
|
||
|
|
vp_iowrite16(i, &cfg->queue_select);
|
||
|
|
vp_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
|
||
|
|
&cfg->queue_desc_hi);
|
||
|
|
vp_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
|
||
|
|
&cfg->queue_avail_hi);
|
||
|
|
vp_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
|
||
|
|
&cfg->queue_used_hi);
|
||
|
|
vp_iowrite16(hw->vring[i].size, &cfg->queue_size);
|
||
|
|
ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
|
||
|
|
vp_iowrite16(1, &cfg->queue_enable);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ifcvf_hw_disable(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
u32 i;
|
||
|
|
|
||
|
|
ifcvf_set_config_vector(hw, VIRTIO_MSI_NO_VECTOR);
|
||
|
|
for (i = 0; i < hw->nr_vring; i++) {
|
||
|
|
ifcvf_set_vq_vector(hw, i, VIRTIO_MSI_NO_VECTOR);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int ifcvf_start_hw(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
ifcvf_reset(hw);
|
||
|
|
ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
|
||
|
|
ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
|
||
|
|
|
||
|
|
if (ifcvf_config_features(hw) < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (ifcvf_hw_enable(hw) < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ifcvf_stop_hw(struct ifcvf_hw *hw)
|
||
|
|
{
|
||
|
|
ifcvf_hw_disable(hw);
|
||
|
|
ifcvf_reset(hw);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
|
||
|
|
{
|
||
|
|
vp_iowrite16(qid, hw->vring[qid].notify_addr);
|
||
|
|
}
|