linux-kernel - [PATCH net-next v2 7/9] octeon

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Date:   Tue, 29 Nov 2022 05:09:30 -0800
From:   Veerasenareddy Burru <vburru@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lironh@...vell.com>, <aayarekar@...vell.com>,
        <sedara@...vell.com>, <sburla@...vell.com>
CC:     <linux-doc@...r.kernel.org>,
        Veerasenareddy Burru <vburru@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 7/9] octeon_ep: add SRIOV VF creation

Add support to create SRIOV VFs.

Signed-off-by: Veerasenareddy Burru <vburru@...vell.com>
Signed-off-by: Sathesh Edara <sedara@...vell.com>
---
v1 -> v2:
 * no change

 .../ethernet/marvell/octeon_ep/octep_main.c   | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index 069c4d18cf37..d43161d1e38a 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -1177,11 +1177,61 @@ static void octep_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static int octep_sriov_disable(struct octep_device *oct)
+{
+	struct pci_dev *pdev = oct->pdev;
+
+	if (pci_vfs_assigned(oct->pdev)) {
+		dev_warn(&pdev->dev, "Can't disable SRIOV while VFs are assigned\n");
+		return -EPERM;
+	}
+
+	pci_disable_sriov(pdev);
+	CFG_GET_ACTIVE_VFS(oct->conf) = 0;
+
+	return 0;
+}
+
+static int octep_sriov_enable(struct octep_device *oct, int num_vfs)
+{
+	struct pci_dev *pdev = oct->pdev;
+	int err;
+
+	err = pci_enable_sriov(pdev, num_vfs);
+	if (err) {
+		dev_warn(&pdev->dev, "Failed to enable SRIOV err=%d\n", err);
+		return err;
+	}
+	CFG_GET_ACTIVE_VFS(oct->conf) = num_vfs;
+
+	return num_vfs;
+}
+
+static int octep_sriov_configure(struct pci_dev *pdev, int num_vfs)
+{
+	struct octep_device *oct = pci_get_drvdata(pdev);
+	int max_nvfs;
+
+	if (num_vfs == 0)
+		return octep_sriov_disable(oct);
+
+	max_nvfs = CFG_GET_MAX_VFS(oct->conf);
+
+	if (num_vfs > max_nvfs) {
+		dev_err(&pdev->dev, "Invalid VF count Max supported VFs = %d\n",
+			max_nvfs);
+		return -EINVAL;
+	}
+
+	return octep_sriov_enable(oct, num_vfs);
+}
+
 static struct pci_driver octep_driver = {
 	.name = OCTEP_DRV_NAME,
 	.id_table = octep_pci_id_tbl,
 	.probe = octep_probe,
 	.remove = octep_remove,
+	.sriov_configure = octep_sriov_configure,
 };
 
 /**
-- 
2.36.0