linux-kernel - [PATCH 2/2] ixgbe: set driver_max_VFs should be done before enabling SRIOV

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Date:	Wed, 15 Jan 2014 22:15:18 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	aaron.f.brown@...el.com, jeffrey.t.kirsher@...el.com,
	jesse.brandeburg@...el.com, bruce.w.allan@...el.com,
	carolyn.wyborny@...el.com, davem@...emloft.net
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ethan Zhao <ethan.kernel@...il.com>
Subject: [PATCH 2/2] ixgbe: set driver_max_VFs should be done before enabling SRIOV

commit 43dc4e01 Limit number of reported VFs to device specific value
It doesn't work and always returns -EBUSY because VFs ware already enabled.

ixgbe_enable_sriov()
        pci_enable_sriov()
                sriov_enable()
                {
                ... ..
                iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
                pci_cfg_access_lock(dev);
                ... ...
                }

pci_sriov_set_totalvfs()
{
... ...
if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
                return -EBUSY;
...
}

So should set driver_max_VFs with pci_sriov_set_totalvfs() before
enable VFs with ixgbe_enable_sriov().

Signed-off-by: Ethan Zhao <ethan.kernel@...il.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 47e9b44..bfc8e94 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7639,8 +7639,8 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Mailbox */
 	ixgbe_init_mbx_params_pf(hw);
 	memcpy(&hw->mbx.ops, ii->mbx_ops, sizeof(hw->mbx.ops));
-	ixgbe_enable_sriov(adapter);
 	pci_sriov_set_totalvfs(pdev, IXGBE_MAX_VFS_DRV_LIMIT);
+	ixgbe_enable_sriov(adapter);
 skip_sriov:
 
 #endif
-- 
1.8.3.4 (Apple Git-47)

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