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mlxsw: item: Add support for local_port field in a split form

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Currently, local_port field uses 8 bits, which means that maximum 256
ports can be used.

As preparation for the next ASIC, which will support more than 256
ports, local_port field should be extended to 10 bits.

It is not possible to use 10 consecutive bits in all registers, and
therefore, the field is split into 2 fields:
1. local_port - the existing 8 bits, represent LSB of the extended
   field.
2. lp_msb - extra 2 bits, represent MSB of the extended field.

To avoid complex programming when reading/writing local_port, add a
dedicated macro which creates get and set functions which handle both parts
of local_port.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amit Cohen 2021-12-01 10:12:33 +02:00 committed by David S. Miller
parent b25dea489b
commit fda39347d9
1 changed files with 36 additions and 0 deletions
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36
drivers/net/ethernet/mellanox/mlxsw/item.h
View file

@ -367,6 +367,42 @@ mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, u32 val) \
__mlxsw_item_set32(buf, &__ITEM_NAME(_type, _cname, _iname), 0, val); \
}
#define LOCAL_PORT_LSB_SIZE 8
#define LOCAL_PORT_MSB_SIZE 2
#define MLXSW_ITEM32_LP(_type, _cname, _offset1, _shift1, _offset2, _shift2) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, local_port) = { \
.offset = _offset1, \
.shift = _shift1, \
.size = {.bits = LOCAL_PORT_LSB_SIZE,}, \
.name = #_type "_" #_cname "_local_port", \
}; \
static struct mlxsw_item __ITEM_NAME(_type, _cname, lp_msb) = { \
.offset = _offset2, \
.shift = _shift2, \
.size = {.bits = LOCAL_PORT_MSB_SIZE,}, \
.name = #_type "_" #_cname "_lp_msb", \
}; \
static inline u32 __maybe_unused \
mlxsw_##_type##_##_cname##_local_port_get(const char *buf) \
{ \
u32 local_port, lp_msb; \
\
local_port = __mlxsw_item_get32(buf, &__ITEM_NAME(_type, _cname, \
local_port), 0); \
lp_msb = __mlxsw_item_get32(buf, &__ITEM_NAME(_type, _cname, lp_msb), \
0); \
return (lp_msb << LOCAL_PORT_LSB_SIZE) + local_port; \
} \
static inline void __maybe_unused \
mlxsw_##_type##_##_cname##_local_port_set(char *buf, u32 val) \
{ \
__mlxsw_item_set32(buf, &__ITEM_NAME(_type, _cname, local_port), 0, \
val & ((1 << LOCAL_PORT_LSB_SIZE) - 1)); \
__mlxsw_item_set32(buf, &__ITEM_NAME(_type, _cname, lp_msb), 0, \
val >> LOCAL_PORT_LSB_SIZE); \
}
#define MLXSW_ITEM32_INDEXED(_type, _cname, _iname, _offset, _shift, _sizebits, \
_step, _instepoffset, _norealshift) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \