netdev - [PATCH RFC v4 net-next 08/13] pds_core: add initial VF device handling

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Message-ID: <20230308051310.12544-9-shannon.nelson@amd.com>
Date:   Tue, 7 Mar 2023 21:13:05 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC:     <drivers@...sando.io>, <leon@...nel.org>, <jiri@...nulli.us>
Subject: [PATCH RFC v4 net-next 08/13] pds_core: add initial VF device handling

This is the initial VF PCI driver framework for the new
pds_vdpa VF device, which will work in conjunction with an
auxiliary_bus client of the pds_core driver.  This does the
very basics of registering for the new PCI device 1dd8:100b,
setting up debugfs entries, and registering with devlink.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/amd/pds_core/main.c | 45 +++++++++++++++++++++++-
 include/linux/pds/pds_core.h             | 10 +++++-
 include/linux/pds/pds_core_if.h          |  1 +
 3 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/pds_core/main.c b/drivers/net/ethernet/amd/pds_core/main.c
index 3cc8f693313a..db260fe149ff 100644
--- a/drivers/net/ethernet/amd/pds_core/main.c
+++ b/drivers/net/ethernet/amd/pds_core/main.c
@@ -21,6 +21,7 @@ MODULE_LICENSE("GPL");
 /* Supported devices */
 static const struct pci_device_id pdsc_id_table[] = {
 	{ PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_CORE_PF) },
+	{ PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_VDPA_VF) },
 	{ 0, }	/* end of table */
 };
 MODULE_DEVICE_TABLE(pci, pdsc_id_table);
@@ -162,9 +163,48 @@ void __iomem *pdsc_map_dbpage(struct pdsc *pdsc, int page_num)
 			       (u64)page_num << PAGE_SHIFT, PAGE_SIZE);
 }
 
+static int pdsc_sriov_configure(struct pci_dev *pdev, int num_vfs)
+{
+	struct pdsc *pdsc = pci_get_drvdata(pdev);
+	struct device *dev = pdsc->dev;
+	int ret = 0;
+
+	if (num_vfs > 0) {
+		pdsc->vfs = kcalloc(num_vfs, sizeof(struct pdsc_vf), GFP_KERNEL);
+		if (!pdsc->vfs)
+			return -ENOMEM;
+		pdsc->num_vfs = num_vfs;
+
+		ret = pci_enable_sriov(pdev, num_vfs);
+		if (ret) {
+			dev_err(dev, "Cannot enable SRIOV: %pe\n", ERR_PTR(ret));
+			goto no_vfs;
+		}
+
+		return num_vfs;
+	}
+
+no_vfs:
+	pci_disable_sriov(pdev);
+
+	kfree(pdsc->vfs);
+	pdsc->vfs = NULL;
+	pdsc->num_vfs = 0;
+
+	return ret;
+}
+
 static int pdsc_init_vf(struct pdsc *pdsc)
 {
-	return -1;
+	int err;
+
+	pdsc->vf_id = pci_iov_vf_id(pdsc->pdev);
+
+	err = pdsc_dl_register(pdsc);
+	if (err)
+		return err;
+
+	return 0;
 }
 
 #define PDSC_WQ_NAME_LEN 24
@@ -316,6 +356,8 @@ static void pdsc_remove(struct pci_dev *pdev)
 	pdsc_dl_unregister(pdsc);
 
 	if (!pdev->is_virtfn) {
+		pdsc_sriov_configure(pdev, 0);
+
 		mutex_lock(&pdsc->config_lock);
 		set_bit(PDSC_S_STOPPING_DRIVER, &pdsc->state);
 
@@ -350,6 +392,7 @@ static struct pci_driver pdsc_driver = {
 	.id_table = pdsc_id_table,
 	.probe = pdsc_probe,
 	.remove = pdsc_remove,
+	.sriov_configure = pdsc_sriov_configure,
 };
 
 static int __init pdsc_init_module(void)
diff --git a/include/linux/pds/pds_core.h b/include/linux/pds/pds_core.h
index 274c899bbc55..7f59b3fbe451 100644
--- a/include/linux/pds/pds_core.h
+++ b/include/linux/pds/pds_core.h
@@ -30,6 +30,12 @@ struct pdsc_dev_bar {
 	int res_index;
 };
 
+struct pdsc_vf {
+	struct pds_auxiliary_dev *padev;
+	u16     index;
+	__le16  vif_types[PDS_DEV_TYPE_MAX];
+};
+
 struct pdsc_devinfo {
 	u8 asic_type;
 	u8 asic_rev;
@@ -147,6 +153,9 @@ struct pdsc {
 	struct dentry *dentry;
 	struct device *dev;
 	struct pdsc_dev_bar bars[PDS_CORE_BARS_MAX];
+	struct pdsc_vf *vfs;
+	int num_vfs;
+	int vf_id;
 	int hw_index;
 	int id;
 
@@ -298,5 +307,4 @@ irqreturn_t pdsc_adminq_isr(int irq, void *data);
 
 int pdsc_firmware_update(struct pdsc *pdsc, const struct firmware *fw,
 			 struct netlink_ext_ack *extack);
-
 #endif /* _PDSC_H_ */
diff --git a/include/linux/pds/pds_core_if.h b/include/linux/pds/pds_core_if.h
index f780b58c785f..1caafcb8c3eb 100644
--- a/include/linux/pds/pds_core_if.h
+++ b/include/linux/pds/pds_core_if.h
@@ -8,6 +8,7 @@
 
 #define PCI_VENDOR_ID_PENSANDO			0x1dd8
 #define PCI_DEVICE_ID_PENSANDO_CORE_PF		0x100c
+#define PCI_DEVICE_ID_PENSANDO_VDPA_VF		0x100b
 
 #define PDS_CORE_BARS_MAX			4
 #define PDS_CORE_PCI_BAR_DBELL			1
-- 
2.17.1