netdev - [PATCH V10 8/8] PCI/IOV: Enable 10-Bit Tag support for PCIe VF devices

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Date:   Sat, 9 Oct 2021 18:49:38 +0800
From:   Dongdong Liu <liudongdong3@...wei.com>
To:     <helgaas@...nel.org>, <hch@...radead.org>, <kw@...ux.com>,
        <logang@...tatee.com>, <leon@...nel.org>,
        <linux-pci@...r.kernel.org>, <rajur@...lsio.com>,
        <hverkuil-cisco@...all.nl>
CC:     <linux-media@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH V10 8/8] PCI/IOV: Enable 10-Bit Tag support for PCIe VF devices

Enable 10-Bit Tag Requester for the VF devices below the
Root Port that support 10-Bit Tag Completer.

Signed-off-by: Dongdong Liu <liudongdong3@...wei.com>
---
 drivers/pci/iov.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index bd600c15258f..760ee8b939cd 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -692,6 +692,15 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 
 	pci_iov_set_numvfs(dev, nr_virtfn);
 	iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
+
+	if ((pcie_tag_config == PCIE_TAG_DEFAULT) &&
+	    (iov->cap & PCI_SRIOV_CAP_VF_10BIT_TAG_REQ) &&
+	    pcie_rp_10bit_tag_cmp_supported(dev))
+		iov->ctrl |= PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
+
+	if (pcie_tag_config == PCIE_TAG_PEER2PEER)
+		iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
+
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	msleep(100);
@@ -708,6 +717,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 
 err_pcibios:
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+	iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	ssleep(1);
@@ -740,6 +750,7 @@ static void sriov_disable(struct pci_dev *dev)
 
 	sriov_del_vfs(dev);
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+	iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	ssleep(1);
-- 
2.22.0