[net-next-2.6 PATCH v3] ixgbe: disable MSI-X by default on certain Cisco adapters

[net-next-2.6 PATCH v3] ixgbe: disable MSI-X by default on certain Cisco adapters

[Jeff Kirsher]

From: Nick Nunley <nicholasx.d.nunley@intel.com>

Due to an errata in 82598 parts MSI-X needs to be disabled
in certain ixgbe devices designed to transfer peer-to-peer
traffic on the PCIe bus. This patch sets the default
interrupt type to MSI rather than MSI-X for specific Cisco
ixgbe adapters.

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Acked-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/ixgbe/ixgbe.h      |    4 ++++
 drivers/net/ixgbe/ixgbe_main.c |   17 ++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 79c35ae..ec6bcc0 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -104,6 +104,10 @@
 #define MAX_EMULATION_MAC_ADDRS         16
 #define VMDQ_P(p)   ((p) + adapter->num_vfs)
 
+#define IXGBE_SUBDEV_ID_82598AF_MEZZ		0x0049
+#define IXGBE_SUBDEV_ID_82598AF_MENLO_Q_MEZZ	0x004a
+#define IXGBE_SUBDEV_ID_82598AF_MENLO_E_MEZZ	0x004b
+
 struct vf_data_storage {
 	unsigned char vf_mac_addresses[ETH_ALEN];
 	u16 vf_mc_hashes[IXGBE_MAX_VF_MC_ENTRIES];
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 2ae5a51..ff59f88 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -4314,6 +4314,9 @@ static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
 	int err = 0;
 	int vector, v_budget;
 
+	if (!(adapter->flags & IXGBE_FLAG_MSIX_CAPABLE))
+		goto try_msi;
+
 	/*
 	 * It's easy to be greedy for MSI-X vectors, but it really
 	 * doesn't do us much good if we have a lot more vectors
@@ -4345,7 +4348,7 @@ static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
 		if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
 			goto out;
 	}
-
+try_msi:
 	adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
 	adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
 	adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;
@@ -4626,6 +4629,18 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
 	adapter->ring_feature[RING_F_RSS].indices = rss;
 	adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
 	adapter->ring_feature[RING_F_DCB].indices = IXGBE_MAX_DCB_INDICES;
+	adapter->flags |= IXGBE_FLAG_MSIX_CAPABLE;
+	if (adapter->hw.device_id == IXGBE_DEV_ID_82598AF_DUAL_PORT) {
+		switch (adapter->hw.subsystem_device_id) {
+		case IXGBE_SUBDEV_ID_82598AF_MEZZ:
+		case IXGBE_SUBDEV_ID_82598AF_MENLO_Q_MEZZ:
+		case IXGBE_SUBDEV_ID_82598AF_MENLO_E_MEZZ:
+			adapter->flags &= ~IXGBE_FLAG_MSIX_CAPABLE;
+			break;
+		default:
+			break;
+		}
+	}
 	if (hw->mac.type == ixgbe_mac_82598EB) {
 		if (hw->device_id == IXGBE_DEV_ID_82598AT)
 			adapter->flags |= IXGBE_FLAG_FAN_FAIL_CAPABLE;

Re: [net-next-2.6 PATCH v3] ixgbe: disable MSI-X by default on certain Cisco adapters

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Tue, 27 Apr 2010 19:45:26 -0700

> From: Nick Nunley <nicholasx.d.nunley@intel.com>
> 
> Due to an errata in 82598 parts MSI-X needs to be disabled
> in certain ixgbe devices designed to transfer peer-to-peer
> traffic on the PCIe bus. This patch sets the default
> interrupt type to MSI rather than MSI-X for specific Cisco
> ixgbe adapters.
> 
> Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
> Acked-by: John Ronciak <john.ronciak@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.

Re: [net-next-2.6 PATCH v3] ixgbe: disable MSI-X by default on certain Cisco adapters

[Jeff Kirsher]

Dave please revert the following patch because it is being fixed
without a software workaround:

commit d5ffd75a27fade39ba5df3b07290c5a2c297b9bd
Author: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Date:   Tue Apr 27 19:47:49 2010 -0700

    ixgbe: disable MSI-X by default on certain Cisco adapters

    Due to an errata in 82598 parts MSI-X needs to be disabled
    in certain ixgbe devices designed to transfer peer-to-peer
    traffic on the PCIe bus. This patch sets the default
    interrupt type to MSI rather than MSI-X for specific Cisco
    ixgbe adapters.

    Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
    Acked-by: John Ronciak <john.ronciak@intel.com>
    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

-- 
Cheers,
Jeff

Re: [net-next-2.6 PATCH v3] ixgbe: disable MSI-X by default on certain Cisco adapters

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Mon, 3 May 2010 15:16:07 -0700

> Dave please revert the following patch because it is being fixed
> without a software workaround:
> 
> commit d5ffd75a27fade39ba5df3b07290c5a2c297b9bd

Done.