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Date: Tue, 5 Jul 2016 11:27:47 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, idosch@...lanox.com, yotamg@...lanox.com,
eladr@...lanox.com, nogahf@...lanox.com, ogerlitz@...lanox.com,
sfeldma@...il.com, roopa@...ulusnetworks.com, andy@...yhouse.net,
dsa@...ulusnetworks.com, tgraf@...g.ch, jhs@...atatu.com,
linville@...driver.com, ivecera@...hat.com
Subject: [patch net-next 11/16] mlxsw: Introduce simplistic KVD linear area manager
From: Jiri Pirko <jiri@...lanox.com>
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@...lanox.com>
Reviewed-by: Ido Schimmel <idosch@...lanox.com>
---
drivers/net/ethernet/mellanox/mlxsw/Makefile | 3 +-
drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 6 ++
.../net/ethernet/mellanox/mlxsw/spectrum_kvdl.c | 91 ++++++++++++++++++++++
3 files changed, 99 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
diff --git a/drivers/net/ethernet/mellanox/mlxsw/Makefile b/drivers/net/ethernet/mellanox/mlxsw/Makefile
index ea05f8a..d20ae18 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/Makefile
+++ b/drivers/net/ethernet/mellanox/mlxsw/Makefile
@@ -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
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index f7d34d8..e781128 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -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
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
new file mode 100644
index 0000000..ac321e8
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
@@ -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@...lanox.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);
+}
--
2.5.5
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