Hi Vlad, I came across this ofed patch which isn't upstream. Is it a must
for making mlx4/ib/4K mtu working? was it rejected from upstream? why?
Or.
mlx4/IB: Add set_4k_mtu module parameter.
It control Infiniband link MTU for all IB ports in a host.
Signed-off-by: Vladimir Sokolovsky <v...@mellanox.co.il>
---
Index: ofed_kernel-fixes/drivers/net/mlx4/port.c
===================================================================
--- ofed_kernel-fixes.orig/drivers/net/mlx4/port.c 2009-11-09
02:20:06.000000000 +0200
+++ ofed_kernel-fixes/drivers/net/mlx4/port.c 2009-11-09 02:21:46.000000000
+0200
@@ -37,6 +37,10 @@
#include "mlx4.h"
+int mlx4_ib_set_4k_mtu = 0;
+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 +312,9 @@
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);
--
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