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mlxsw: Introduce simplistic KVD linear area manager 

This is a very simple manager for KVD linear area. Currently, the
allocator will either allocate a single entry from pre-defined sub-area,
or in case more than one entry is needed, it will allocate 32-entry chunk
in other pre-defined sub-area.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2016-07-05 11:27:47 +02:00 committed by David S. Miller
parent c602242761
commit b090ef0686
3 changed files with 99 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlxsw/Makefile
View File

@ -7,5 +7,6 @@ obj-$(CONFIG_MLXSW_SWITCHX2) += mlxsw_switchx2.o
mlxsw_switchx2-objs := switchx2.o
obj-$(CONFIG_MLXSW_SPECTRUM) += mlxsw_spectrum.o
mlxsw_spectrum-objs := spectrum.o spectrum_buffers.o \
spectrum_switchdev.o spectrum_router.o
spectrum_switchdev.o spectrum_router.o \
spectrum_kvdl.o
mlxsw_spectrum-$(CONFIG_MLXSW_SPECTRUM_DCB) += spectrum_dcb.o

6
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View File

@ -253,6 +253,9 @@ struct mlxsw_sp {
u8 port_to_module[MLXSW_PORT_MAX_PORTS];
struct mlxsw_sp_sb sb;
struct mlxsw_sp_router router;
struct {
DECLARE_BITMAP(usage, MLXSW_SP_KVD_LINEAR_SIZE);
} kvdl;
};
static inline struct mlxsw_sp_upper *
@ -539,4 +542,7 @@ int mlxsw_sp_router_neigh_construct(struct net_device *dev,
void mlxsw_sp_router_neigh_destroy(struct net_device *dev,
struct neighbour *n);
int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count);
void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index);
#endif

91
drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c Normal file
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@ -0,0 +1,91 @@
/*
* drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/bitops.h>
#include "spectrum.h"
#define MLXSW_SP_KVDL_SINGLE_BASE 0
#define MLXSW_SP_KVDL_SINGLE_SIZE 16384
#define MLXSW_SP_KVDL_CHUNKS_BASE \
(MLXSW_SP_KVDL_SINGLE_BASE + MLXSW_SP_KVDL_SINGLE_SIZE)
#define MLXSW_SP_KVDL_CHUNKS_SIZE \
(MLXSW_SP_KVD_LINEAR_SIZE - MLXSW_SP_KVDL_CHUNKS_BASE)
#define MLXSW_SP_CHUNK_MAX 32
int mlxsw_sp_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, unsigned int entry_count)
{
int entry_index;
int size;
int type_base;
int type_size;
int type_entries;
if (entry_count == 0 || entry_count > MLXSW_SP_CHUNK_MAX) {
return -EINVAL;
} else if (entry_count == 1) {
type_base = MLXSW_SP_KVDL_SINGLE_BASE;
type_size = MLXSW_SP_KVDL_SINGLE_SIZE;
type_entries = 1;
} else {
type_base = MLXSW_SP_KVDL_CHUNKS_BASE;
type_size = MLXSW_SP_KVDL_CHUNKS_SIZE;
type_entries = MLXSW_SP_CHUNK_MAX;
}
entry_index = type_base;
size = type_base + type_size;
for_each_clear_bit_from(entry_index, mlxsw_sp->kvdl.usage, size) {
int i;
for (i = 0; i < type_entries; i++)
set_bit(entry_index + i, mlxsw_sp->kvdl.usage);
return entry_index;
}
return -ENOBUFS;
}
void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index)
{
int type_entries;
int i;
if (entry_index < MLXSW_SP_KVDL_CHUNKS_BASE)
type_entries = 1;
else
type_entries = MLXSW_SP_CHUNK_MAX;
for (i = 0; i < type_entries; i++)
clear_bit(entry_index + i, mlxsw_sp->kvdl.usage);
}