mlxsw: spectrum_buffers: Reject overlarge headroom size requests

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cap_max_headroom_size holds maximum headroom size supported.
Overstepping that limit might under certain conditions lead to ASIC
freeze.

Query and store the value, and add mlxsw_sp_sb_max_headroom_cells() for
obtaining the stored value. In __mlxsw_sp_port_headroom_set(), reject
requests where the total port buffer is larger than the advertised
maximum.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Petr Machata 2019-02-20 19:32:29 +00:00 • committed by David S. Miller

parent edf777f55a

commit bb6c346cef

4 changed files with 31 additions and 1 deletions

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2

drivers/net/ethernet/mellanox/mlxsw/resources.h

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13

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

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1

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

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drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c

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