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416 lines
9.7 KiB
416 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Intel IFC VF NIC driver for virtio dataplane offloading |
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* |
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* Copyright (C) 2020 Intel Corporation. |
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* |
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* Author: Zhu Lingshan <[email protected]> |
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* |
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*/ |
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#include "ifcvf_base.h" |
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static inline u8 ifc_ioread8(u8 __iomem *addr) |
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{ |
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return ioread8(addr); |
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} |
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static inline u16 ifc_ioread16 (__le16 __iomem *addr) |
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{ |
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return ioread16(addr); |
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} |
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static inline u32 ifc_ioread32(__le32 __iomem *addr) |
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{ |
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return ioread32(addr); |
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} |
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static inline void ifc_iowrite8(u8 value, u8 __iomem *addr) |
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{ |
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iowrite8(value, addr); |
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} |
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static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr) |
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{ |
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iowrite16(value, addr); |
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} |
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static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr) |
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{ |
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iowrite32(value, addr); |
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} |
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static void ifc_iowrite64_twopart(u64 val, |
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__le32 __iomem *lo, __le32 __iomem *hi) |
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{ |
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ifc_iowrite32((u32)val, lo); |
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ifc_iowrite32(val >> 32, hi); |
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} |
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struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw) |
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{ |
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return container_of(hw, struct ifcvf_adapter, vf); |
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} |
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static void __iomem *get_cap_addr(struct ifcvf_hw *hw, |
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struct virtio_pci_cap *cap) |
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{ |
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struct ifcvf_adapter *ifcvf; |
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struct pci_dev *pdev; |
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u32 length, offset; |
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u8 bar; |
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length = le32_to_cpu(cap->length); |
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offset = le32_to_cpu(cap->offset); |
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bar = cap->bar; |
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ifcvf= vf_to_adapter(hw); |
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pdev = ifcvf->pdev; |
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if (bar >= IFCVF_PCI_MAX_RESOURCE) { |
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IFCVF_DBG(pdev, |
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"Invalid bar number %u to get capabilities\n", bar); |
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return NULL; |
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} |
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if (offset + length > pci_resource_len(pdev, bar)) { |
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IFCVF_DBG(pdev, |
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"offset(%u) + len(%u) overflows bar%u's capability\n", |
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offset, length, bar); |
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return NULL; |
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} |
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return hw->base[bar] + offset; |
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} |
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static int ifcvf_read_config_range(struct pci_dev *dev, |
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uint32_t *val, int size, int where) |
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{ |
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int ret, i; |
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for (i = 0; i < size; i += 4) { |
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ret = pci_read_config_dword(dev, where + i, val + i / 4); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev) |
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{ |
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struct virtio_pci_cap cap; |
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u16 notify_off; |
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int ret; |
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u8 pos; |
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u32 i; |
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ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos); |
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if (ret < 0) { |
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IFCVF_ERR(pdev, "Failed to read PCI capability list\n"); |
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return -EIO; |
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} |
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while (pos) { |
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ret = ifcvf_read_config_range(pdev, (u32 *)&cap, |
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sizeof(cap), pos); |
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if (ret < 0) { |
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IFCVF_ERR(pdev, |
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"Failed to get PCI capability at %x\n", pos); |
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break; |
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} |
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if (cap.cap_vndr != PCI_CAP_ID_VNDR) |
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goto next; |
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switch (cap.cfg_type) { |
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case VIRTIO_PCI_CAP_COMMON_CFG: |
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hw->common_cfg = get_cap_addr(hw, &cap); |
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IFCVF_DBG(pdev, "hw->common_cfg = %p\n", |
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hw->common_cfg); |
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break; |
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case VIRTIO_PCI_CAP_NOTIFY_CFG: |
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pci_read_config_dword(pdev, pos + sizeof(cap), |
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&hw->notify_off_multiplier); |
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hw->notify_bar = cap.bar; |
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hw->notify_base = get_cap_addr(hw, &cap); |
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hw->notify_base_pa = pci_resource_start(pdev, cap.bar) + |
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le32_to_cpu(cap.offset); |
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IFCVF_DBG(pdev, "hw->notify_base = %p\n", |
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hw->notify_base); |
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break; |
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case VIRTIO_PCI_CAP_ISR_CFG: |
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hw->isr = get_cap_addr(hw, &cap); |
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IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr); |
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break; |
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case VIRTIO_PCI_CAP_DEVICE_CFG: |
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hw->net_cfg = get_cap_addr(hw, &cap); |
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IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg); |
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break; |
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} |
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next: |
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pos = cap.cap_next; |
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} |
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if (hw->common_cfg == NULL || hw->notify_base == NULL || |
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hw->isr == NULL || hw->net_cfg == NULL) { |
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IFCVF_ERR(pdev, "Incomplete PCI capabilities\n"); |
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return -EIO; |
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} |
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hw->nr_vring = ifc_ioread16(&hw->common_cfg->num_queues); |
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for (i = 0; i < hw->nr_vring; i++) { |
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ifc_iowrite16(i, &hw->common_cfg->queue_select); |
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notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off); |
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hw->vring[i].notify_addr = hw->notify_base + |
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notify_off * hw->notify_off_multiplier; |
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hw->vring[i].notify_pa = hw->notify_base_pa + |
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notify_off * hw->notify_off_multiplier; |
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} |
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hw->lm_cfg = hw->base[IFCVF_LM_BAR]; |
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IFCVF_DBG(pdev, |
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"PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n", |
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hw->common_cfg, hw->notify_base, hw->isr, |
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hw->net_cfg, hw->notify_off_multiplier); |
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return 0; |
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} |
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u8 ifcvf_get_status(struct ifcvf_hw *hw) |
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{ |
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return ifc_ioread8(&hw->common_cfg->device_status); |
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} |
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void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) |
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{ |
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ifc_iowrite8(status, &hw->common_cfg->device_status); |
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} |
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void ifcvf_reset(struct ifcvf_hw *hw) |
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{ |
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hw->config_cb.callback = NULL; |
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hw->config_cb.private = NULL; |
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ifcvf_set_status(hw, 0); |
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/* flush set_status, make sure VF is stopped, reset */ |
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ifcvf_get_status(hw); |
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} |
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static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status) |
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{ |
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if (status != 0) |
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status |= ifcvf_get_status(hw); |
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ifcvf_set_status(hw, status); |
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ifcvf_get_status(hw); |
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} |
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u64 ifcvf_get_hw_features(struct ifcvf_hw *hw) |
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{ |
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struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; |
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u32 features_lo, features_hi; |
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u64 features; |
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ifc_iowrite32(0, &cfg->device_feature_select); |
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features_lo = ifc_ioread32(&cfg->device_feature); |
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ifc_iowrite32(1, &cfg->device_feature_select); |
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features_hi = ifc_ioread32(&cfg->device_feature); |
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features = ((u64)features_hi << 32) | features_lo; |
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return features; |
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} |
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u64 ifcvf_get_features(struct ifcvf_hw *hw) |
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{ |
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return hw->hw_features; |
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} |
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int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features) |
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{ |
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struct ifcvf_adapter *ifcvf = vf_to_adapter(hw); |
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if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) { |
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IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset, |
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void *dst, int length) |
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{ |
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u8 old_gen, new_gen, *p; |
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int i; |
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WARN_ON(offset + length > sizeof(struct virtio_net_config)); |
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do { |
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old_gen = ifc_ioread8(&hw->common_cfg->config_generation); |
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p = dst; |
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for (i = 0; i < length; i++) |
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*p++ = ifc_ioread8(hw->net_cfg + offset + i); |
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new_gen = ifc_ioread8(&hw->common_cfg->config_generation); |
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} while (old_gen != new_gen); |
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} |
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void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset, |
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const void *src, int length) |
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{ |
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const u8 *p; |
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int i; |
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p = src; |
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WARN_ON(offset + length > sizeof(struct virtio_net_config)); |
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for (i = 0; i < length; i++) |
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ifc_iowrite8(*p++, hw->net_cfg + offset + i); |
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} |
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static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features) |
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{ |
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struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; |
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ifc_iowrite32(0, &cfg->guest_feature_select); |
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ifc_iowrite32((u32)features, &cfg->guest_feature); |
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ifc_iowrite32(1, &cfg->guest_feature_select); |
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ifc_iowrite32(features >> 32, &cfg->guest_feature); |
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} |
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static int ifcvf_config_features(struct ifcvf_hw *hw) |
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{ |
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struct ifcvf_adapter *ifcvf; |
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ifcvf = vf_to_adapter(hw); |
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ifcvf_set_features(hw, hw->req_features); |
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ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK); |
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if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) { |
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IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n"); |
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return -EIO; |
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} |
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return 0; |
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} |
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u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid) |
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{ |
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struct ifcvf_lm_cfg __iomem *ifcvf_lm; |
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void __iomem *avail_idx_addr; |
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u16 last_avail_idx; |
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u32 q_pair_id; |
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ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; |
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q_pair_id = qid / hw->nr_vring; |
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avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; |
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last_avail_idx = ifc_ioread16(avail_idx_addr); |
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return last_avail_idx; |
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} |
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int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num) |
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{ |
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struct ifcvf_lm_cfg __iomem *ifcvf_lm; |
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void __iomem *avail_idx_addr; |
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u32 q_pair_id; |
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ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; |
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q_pair_id = qid / hw->nr_vring; |
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avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; |
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hw->vring[qid].last_avail_idx = num; |
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ifc_iowrite16(num, avail_idx_addr); |
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return 0; |
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} |
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static int ifcvf_hw_enable(struct ifcvf_hw *hw) |
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{ |
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struct virtio_pci_common_cfg __iomem *cfg; |
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struct ifcvf_adapter *ifcvf; |
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u32 i; |
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ifcvf = vf_to_adapter(hw); |
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cfg = hw->common_cfg; |
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ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config); |
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if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) { |
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IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n"); |
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return -EINVAL; |
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} |
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for (i = 0; i < hw->nr_vring; i++) { |
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if (!hw->vring[i].ready) |
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break; |
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ifc_iowrite16(i, &cfg->queue_select); |
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ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo, |
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&cfg->queue_desc_hi); |
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ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo, |
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&cfg->queue_avail_hi); |
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ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo, |
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&cfg->queue_used_hi); |
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ifc_iowrite16(hw->vring[i].size, &cfg->queue_size); |
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ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector); |
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if (ifc_ioread16(&cfg->queue_msix_vector) == |
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VIRTIO_MSI_NO_VECTOR) { |
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IFCVF_ERR(ifcvf->pdev, |
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"No msix vector for queue %u\n", i); |
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return -EINVAL; |
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} |
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ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx); |
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ifc_iowrite16(1, &cfg->queue_enable); |
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} |
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return 0; |
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} |
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static void ifcvf_hw_disable(struct ifcvf_hw *hw) |
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{ |
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struct virtio_pci_common_cfg __iomem *cfg; |
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u32 i; |
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cfg = hw->common_cfg; |
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ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config); |
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for (i = 0; i < hw->nr_vring; i++) { |
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ifc_iowrite16(i, &cfg->queue_select); |
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ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector); |
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} |
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ifc_ioread16(&cfg->queue_msix_vector); |
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} |
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int ifcvf_start_hw(struct ifcvf_hw *hw) |
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{ |
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ifcvf_reset(hw); |
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ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE); |
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ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER); |
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if (ifcvf_config_features(hw) < 0) |
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return -EINVAL; |
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if (ifcvf_hw_enable(hw) < 0) |
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return -EINVAL; |
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ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK); |
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return 0; |
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} |
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void ifcvf_stop_hw(struct ifcvf_hw *hw) |
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{ |
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ifcvf_hw_disable(hw); |
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ifcvf_reset(hw); |
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} |
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void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid) |
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{ |
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ifc_iowrite16(qid, hw->vring[qid].notify_addr); |
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}
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