--- /dev/null
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Nogah Frankel <nogahf@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/errno.h>
+#include <linux/netdevice.h>
+#include <net/pkt_cls.h>
+
+#include "spectrum.h"
+#include "reg.h"
+
+static int
+mlxsw_sp_tclass_congestion_enable(struct mlxsw_sp_port *mlxsw_sp_port,
+ int tclass_num, u32 min, u32 max,
+ u32 probability, bool is_ecn)
+{
+ char cwtp_cmd[max_t(u8, MLXSW_REG_CWTP_LEN, MLXSW_REG_CWTPM_LEN)];
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ int err;
+
+ mlxsw_reg_cwtp_pack(cwtp_cmd, mlxsw_sp_port->local_port, tclass_num);
+ mlxsw_reg_cwtp_profile_pack(cwtp_cmd, MLXSW_REG_CWTP_DEFAULT_PROFILE,
+ roundup(min, MLXSW_REG_CWTP_MIN_VALUE),
+ roundup(max, MLXSW_REG_CWTP_MIN_VALUE),
+ probability);
+
+ err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(cwtp), cwtp_cmd);
+ if (err)
+ return err;
+
+ mlxsw_reg_cwtpm_pack(cwtp_cmd, mlxsw_sp_port->local_port, tclass_num,
+ MLXSW_REG_CWTP_DEFAULT_PROFILE, true, is_ecn);
+
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(cwtpm), cwtp_cmd);
+}
+
+static int
+mlxsw_sp_tclass_congestion_disable(struct mlxsw_sp_port *mlxsw_sp_port,
+ int tclass_num)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char cwtpm_cmd[MLXSW_REG_CWTPM_LEN];
+
+ mlxsw_reg_cwtpm_pack(cwtpm_cmd, mlxsw_sp_port->local_port, tclass_num,
+ MLXSW_REG_CWTPM_RESET_PROFILE, false, false);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(cwtpm), cwtpm_cmd);
+}
+
+static int
+mlxsw_sp_qdisc_red_destroy(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
+ struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+ int tclass_num)
+{
+ int err;
+
+ if (mlxsw_sp_qdisc->handle != handle)
+ return 0;
+
+ err = mlxsw_sp_tclass_congestion_disable(mlxsw_sp_port, tclass_num);
+ mlxsw_sp_qdisc->handle = TC_H_UNSPEC;
+ mlxsw_sp_qdisc->type = MLXSW_SP_QDISC_NO_QDISC;
+
+ return err;
+}
+
+static int
+mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
+ struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+ int tclass_num,
+ struct tc_red_qopt_offload_params *p)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ u32 min, max;
+ u64 prob;
+ int err = 0;
+
+ if (p->min > p->max) {
+ dev_err(mlxsw_sp->bus_info->dev,
+ "spectrum: RED: min %u is bigger then max %u\n", p->min,
+ p->max);
+ goto err_bad_param;
+ }
+ if (p->max > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE)) {
+ dev_err(mlxsw_sp->bus_info->dev,
+ "spectrum: RED: max value %u is too big\n", p->max);
+ goto err_bad_param;
+ }
+ if (p->min == 0 || p->max == 0) {
+ dev_err(mlxsw_sp->bus_info->dev,
+ "spectrum: RED: 0 value is illegal for min and max\n");
+ goto err_bad_param;
+ }
+
+ /* calculate probability in percentage */
+ prob = p->probability;
+ prob *= 100;
+ prob = DIV_ROUND_UP(prob, 1 << 16);
+ prob = DIV_ROUND_UP(prob, 1 << 16);
+ min = mlxsw_sp_bytes_cells(mlxsw_sp, p->min);
+ max = mlxsw_sp_bytes_cells(mlxsw_sp, p->max);
+ err = mlxsw_sp_tclass_congestion_enable(mlxsw_sp_port, tclass_num, min,
+ max, prob, p->is_ecn);
+ if (err)
+ goto err_config;
+
+ mlxsw_sp_qdisc->type = MLXSW_SP_QDISC_RED;
+ mlxsw_sp_qdisc->handle = handle;
+ return 0;
+
+err_bad_param:
+ err = -EINVAL;
+err_config:
+ mlxsw_sp_qdisc_red_destroy(mlxsw_sp_port, mlxsw_sp_qdisc->handle,
+ mlxsw_sp_qdisc, tclass_num);
+ return err;
+}
+
+#define MLXSW_SP_PORT_DEFAULT_TCLASS 0
+
+int mlxsw_sp_setup_tc_red(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct tc_red_qopt_offload *p)
+{
+ struct mlxsw_sp_qdisc *mlxsw_sp_qdisc;
+ int tclass_num;
+
+ if (p->parent != TC_H_ROOT)
+ return -EOPNOTSUPP;
+
+ mlxsw_sp_qdisc = &mlxsw_sp_port->root_qdisc;
+ tclass_num = MLXSW_SP_PORT_DEFAULT_TCLASS;
+
+ switch (p->command) {
+ case TC_RED_REPLACE:
+ return mlxsw_sp_qdisc_red_replace(mlxsw_sp_port, p->handle,
+ mlxsw_sp_qdisc, tclass_num,
+ &p->set);
+ case TC_RED_DESTROY:
+ return mlxsw_sp_qdisc_red_destroy(mlxsw_sp_port, p->handle,
+ mlxsw_sp_qdisc, tclass_num);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
projects / openwrt / staging / blogic.git / commitdiff