netdev - [PATCH V2 net-next 02/10] net/mlx4_core: Mask out host side virtualization features for guests

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Message-Id: <1418288280-334-3-git-send-email-ogerlitz@mellanox.com>
Date:	Thu, 11 Dec 2014 10:57:52 +0200
From:	Or Gerlitz <ogerlitz@...lanox.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Matan Barak <matanb@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>, Tal Alon <talal@...lanox.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH V2 net-next 02/10] net/mlx4_core: Mask out host side virtualization features for guests

When VFs (guests in this context) issue the QUERY_DEV_CAP command, they
need not be told that host side virtualization features such as VST, FSM
(MAC anti-spoofing) and running > 80 VFs are supported by the device.

Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/fw.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index 4251f81..5089f76 100644
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -973,6 +973,10 @@ out:
 	return err;
 }
 
+#define DEV_CAP_EXT_2_FLAG_VLAN_CONTROL (1 << 26)
+#define DEV_CAP_EXT_2_FLAG_80_VFS	(1 << 21)
+#define DEV_CAP_EXT_2_FLAG_FSM		(1 << 20)
+
 int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
 			       struct mlx4_vhcr *vhcr,
 			       struct mlx4_cmd_mailbox *inbox,
@@ -982,7 +986,7 @@ int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
 	u64	flags;
 	int	err = 0;
 	u8	field;
-	u32	bmme_flags;
+	u32	bmme_flags, field32;
 	int	real_port;
 	int	slave_port;
 	int	first_port;
@@ -1053,6 +1057,12 @@ int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
 	field &= ~0x80;
 	MLX4_PUT(outbox->buf, field, QUERY_DEV_CAP_FLOW_STEERING_IPOIB_OFFSET);
 
+	/* turn off host side virt features (VST, FSM, etc) for guests */
+	MLX4_GET(field32, outbox->buf, QUERY_DEV_CAP_EXT_2_FLAGS_OFFSET);
+	field32 &= ~(DEV_CAP_EXT_2_FLAG_VLAN_CONTROL | DEV_CAP_EXT_2_FLAG_80_VFS |
+		     DEV_CAP_EXT_2_FLAG_FSM);
+	MLX4_PUT(outbox->buf, field32, QUERY_DEV_CAP_EXT_2_FLAGS_OFFSET);
+
 	return 0;
 }
 
-- 
1.7.1

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