igb: fix i350 SR-IOV failture

commit 665c8c8ee405738375b679246b49342ce38ba056 upstream.

When SR-IOV is enabled, i350 devices fail to pass traffic. This is due to
the driver attempting to enable RSS on the PF device, which is not
supported by the i350.

When max_vfs is specified on an i350 adapter, set the number of RSS queues
to 1.

This issue affects 2.6.39 as well.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 0dfd1b93829e5933b76d64ac3eb1a5c08b32cef5..0e3fccbd41a3667e76a1c0586e5e33f3e6faba8c 100644 (file)
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2372,6 +2372,9 @@ static int __devinit igb_sw_init(struct igb_adapter *adapter)
        }
 #endif /* CONFIG_PCI_IOV */
        adapter->rss_queues = min_t(u32, IGB_MAX_RX_QUEUES, num_online_cpus());
+       /* i350 cannot do RSS and SR-IOV at the same time */
+       if (hw->mac.type == e1000_i350 && adapter->vfs_allocated_count)
+               adapter->rss_queues = 1;
 
        /*
         * if rss_queues > 4 or vfs are going to be allocated with rss_queues