[PATCH] ifcvf/vDPA: ifcvf drives standard virtio pci devices

[Zhu Lingshan]

Most of ifcvf code work for standard virtio pci,
except for bar4. This commit makes bar4 only effective
for Intel products, thereby turning ifcvf into
a standard virtio pci driver.

Signed-off-by: Zhu Lingshan <lingshan....@intel.com>
---
 drivers/vdpa/Kconfig            |  2 +-
 drivers/vdpa/ifcvf/ifcvf_base.c | 17 ++++++++++++-----
 drivers/vdpa/ifcvf/ifcvf_main.c |  5 ++++-
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
index 656c1cb541de..dbf09f35bcef 100644
--- a/drivers/vdpa/Kconfig
+++ b/drivers/vdpa/Kconfig
@@ -44,7 +44,7 @@ config VDPA_USER
          in a userspace program.
 
 config IFCVF
-       tristate "Intel IFC VF vDPA driver"
+       tristate "Intel IFC VF and standard virtio-pci vDPA driver"
        depends on PCI_MSI
        help
          This kernel module can drive Intel IFC VF NIC to offload
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index 472daa588a9d..47bc9b11c678 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -178,7 +178,8 @@ int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
                hw->vring[i].irq = -EINVAL;
        }
 
-       hw->lm_cfg = hw->base[IFCVF_LM_BAR];
+       if (hw->pdev->subsystem_vendor == PCI_VENDOR_ID_INTEL)
+               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",
@@ -330,18 +331,24 @@ u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
        struct ifcvf_lm_cfg  __iomem *lm_cfg = hw->lm_cfg;
        u16 last_avail_idx;
 
-       last_avail_idx = vp_ioread16(&lm_cfg->vq_state_region + qid * 2);
+       if (lm_cfg) {
+               last_avail_idx = vp_ioread16(&lm_cfg->vq_state_region + qid * 
2);
+               return last_avail_idx;
+       }
 
-       return last_avail_idx;
+       return -EOPNOTSUPP;
 }
 
 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
 {
        struct ifcvf_lm_cfg  __iomem *lm_cfg = hw->lm_cfg;
 
-       vp_iowrite16(num, &lm_cfg->vq_state_region + qid * 2);
+       if (lm_cfg) {
+               vp_iowrite16(num, &lm_cfg->vq_state_region + qid * 2);
+               return 0;
+       }
 
-       return 0;
+       return -EOPNOTSUPP;
 }
 
 void ifcvf_set_vq_num(struct ifcvf_hw *hw, u16 qid, u32 num)
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 80d0a0460885..e89fd4d96ff1 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Intel IFC VF NIC driver for virtio dataplane offloading
+ * This driver also drives standard virtio-pci hardwares
  *
  * Copyright (C) 2020 Intel Corporation.
  *
@@ -880,7 +881,9 @@ static struct pci_device_id ifcvf_pci_ids[] = {
                         VIRTIO_TRANS_ID_BLOCK,
                         PCI_VENDOR_ID_INTEL,
                         VIRTIO_ID_BLOCK) },
-
+       /* standard virtio pci devices */
+       { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET,
+                    PCI_ANY_ID) },
        { 0 },
 };
 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
-- 
2.43.0