It control Infiniband link MTU for all IB ports in a host.
Signed-off-by: Vladimir Sokolovsky <[email protected]>
---
drivers/net/mlx4/port.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/drivers/net/mlx4/port.c b/drivers/net/mlx4/port.c
index 606aa58..0e9d745 100644
--- a/drivers/net/mlx4/port.c
+++ b/drivers/net/mlx4/port.c
@@ -37,6 +37,10 @@
#include "mlx4.h"
+static int mlx4_ib_set_4k_mtu;
+module_param_named(set_4k_mtu, mlx4_ib_set_4k_mtu, int, 0444);
+MODULE_PARM_DESC(set_4k_mtu, "attempt to set 4K MTU to all ConnectX ports");
+
#define MLX4_MAC_VALID (1ull << 63)
#define MLX4_MAC_MASK 0xffffffffffffULL
@@ -308,6 +312,12 @@ int mlx4_SET_PORT(struct mlx4_dev *dev, u8 port)
memset(mailbox->buf, 0, 256);
+ if (mlx4_ib_set_4k_mtu)
+ ((__be32 *) mailbox->buf)[0] |= cpu_to_be32((1 << 22) |
+ (1 << 21) |
+ (5 << 12) |
+ (2 << 4));
+
((__be32 *) mailbox->buf)[1] = dev->caps.ib_port_def_cap[port];
err = mlx4_cmd(dev, mailbox->dma, port, 0, MLX4_CMD_SET_PORT,
MLX4_CMD_TIME_CLASS_B);
--
1.5.4.3
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