net/mlx4: Query device for QoS per VF support

Checks in QUERY_DEV_CAP if the granular QoS per VF feature is
supported by the device. Disabled for guests.
Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/fw.c

@@ -147,7 +147,8 @@ static void dump_dev_cap_flags2(struct mlx4_dev *dev, u64 flags)
 		[21] = "Port Remap support",
 		[22] = "QCN support",
 		[23] = "QP rate limiting support",
-		[24] = "Ethernet Flow control statistics support"
+		[24] = "Ethernet Flow control statistics support",
+		[25] = "Granular QoS per VF support",
 	};
 	int i;
 
@@ -871,6 +872,8 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 	MLX4_GET(size, outbox, QUERY_DEV_CAP_MAX_DESC_SZ_RQ_OFFSET);
 	dev_cap->max_rq_desc_sz = size;
 	MLX4_GET(field, outbox, QUERY_DEV_CAP_CQ_EQ_CACHE_LINE_STRIDE);
+	if (field & (1 << 4))
+		dev_cap->flags2 |= MLX4_DEV_CAP_FLAG2_QOS_VPP;
 	if (field & (1 << 5))
 		dev_cap->flags2 |= MLX4_DEV_CAP_FLAG2_ETH_PROT_CTRL;
 	if (field & (1 << 6))
@@ -1199,6 +1202,11 @@ int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
 	field16 = 0;
 	MLX4_PUT(outbox->buf, field16, QUERY_DEV_CAP_QP_RATE_LIMIT_NUM_OFFSET);
 
+	/* turn off QoS per VF support for guests */
+	MLX4_GET(field, outbox->buf, QUERY_DEV_CAP_CQ_EQ_CACHE_LINE_STRIDE);
+	field &= 0xef;
+	MLX4_PUT(outbox->buf, field, QUERY_DEV_CAP_CQ_EQ_CACHE_LINE_STRIDE);
+
 	return 0;
 }
 

include/linux/mlx4/device.h

@@ -205,7 +205,8 @@ enum {
 	MLX4_DEV_CAP_FLAG2_PORT_REMAP		= 1LL <<  21,
 	MLX4_DEV_CAP_FLAG2_QCN			= 1LL <<  22,
 	MLX4_DEV_CAP_FLAG2_QP_RATE_LIMIT	= 1LL <<  23,
-	MLX4_DEV_CAP_FLAG2_FLOWSTATS_EN         = 1LL <<  24
+	MLX4_DEV_CAP_FLAG2_FLOWSTATS_EN         = 1LL <<  24,
+	MLX4_DEV_CAP_FLAG2_QOS_VPP		= 1LL <<  25,
 };
 
 enum {