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mlx4_core: Allow dynamic MTU configuration for IB ports

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Set the MTU for IB ports in the driver instead of using the firmware
default of 2KB (the driver defaults to 4KB).  Allow for dynamic mtu
configuration through a new, per-port sysfs entry.

Since there's a dependency between the port MTU and the max number of
HW VLs the port can support, apply a mim/max approach, using a loop
that goes down from the highest possible number of VLs to the lowest,
using the firmware return status to know whether the requested number
of VLs is possible with a given MTU.

For now, as with the dynamic link type change / VPI support, the sysfs
entry to change the mtu is exposed only when NOT running in SR-IOV
mode.  To allow changing the MTU for the master in SR-IOV mode,
primary-function-initiated FLR (Function Level Reset) needs to be
implemented.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Or Gerlitz
2012-01-11 19:02:17 +02:00
committed by Roland Dreier
parent a9c766bb75
commit 096335b3f9
4 changed files with 141 additions and 4 deletions
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include/linux/mlx4/device.h
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@@ -315,6 +315,7 @@ struct mlx4_caps {
enum mlx4_port_type possible_type[MLX4_MAX_PORTS + 1];
u32 max_counters;
u8 ext_port_cap[MLX4_MAX_PORTS + 1];
u8 port_ib_mtu[MLX4_MAX_PORTS + 1];
};
struct mlx4_buf_list {