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path: root/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
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Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c')
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c480
1 files changed, 480 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
new file mode 100644
index 000000000000..0b323661c0b6
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
@@ -0,0 +1,480 @@
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Ido Schimmel <idosch@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/netdevice.h>
+#include <linux/string.h>
+#include <linux/bitops.h>
+#include <net/dcbnl.h>
+
+#include "spectrum.h"
+#include "reg.h"
+
+static u8 mlxsw_sp_dcbnl_getdcbx(struct net_device __always_unused *dev)
+{
+ return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
+}
+
+static u8 mlxsw_sp_dcbnl_setdcbx(struct net_device __always_unused *dev,
+ u8 mode)
+{
+ return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0;
+}
+
+static int mlxsw_sp_dcbnl_ieee_getets(struct net_device *dev,
+ struct ieee_ets *ets)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+
+ memcpy(ets, mlxsw_sp_port->dcb.ets, sizeof(*ets));
+
+ return 0;
+}
+
+static int mlxsw_sp_port_ets_validate(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct ieee_ets *ets)
+{
+ struct net_device *dev = mlxsw_sp_port->dev;
+ bool has_ets_tc = false;
+ int i, tx_bw_sum = 0;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ switch (ets->tc_tsa[i]) {
+ case IEEE_8021QAZ_TSA_STRICT:
+ break;
+ case IEEE_8021QAZ_TSA_ETS:
+ has_ets_tc = true;
+ tx_bw_sum += ets->tc_tx_bw[i];
+ break;
+ default:
+ netdev_err(dev, "Only strict priority and ETS are supported\n");
+ return -EINVAL;
+ }
+
+ if (ets->prio_tc[i] >= IEEE_8021QAZ_MAX_TCS) {
+ netdev_err(dev, "Invalid TC\n");
+ return -EINVAL;
+ }
+ }
+
+ if (has_ets_tc && tx_bw_sum != 100) {
+ netdev_err(dev, "Total ETS bandwidth should equal 100\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mlxsw_sp_port_pg_prio_map(struct mlxsw_sp_port *mlxsw_sp_port,
+ u8 *prio_tc)
+{
+ char pptb_pl[MLXSW_REG_PPTB_LEN];
+ int i;
+
+ mlxsw_reg_pptb_pack(pptb_pl, mlxsw_sp_port->local_port);
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
+ mlxsw_reg_pptb_prio_to_buff_set(pptb_pl, i, prio_tc[i]);
+ return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pptb),
+ pptb_pl);
+}
+
+static bool mlxsw_sp_ets_has_pg(u8 *prio_tc, u8 pg)
+{
+ int i;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
+ if (prio_tc[i] == pg)
+ return true;
+ return false;
+}
+
+static int mlxsw_sp_port_pg_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
+ u8 *old_prio_tc, u8 *new_prio_tc)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char pbmc_pl[MLXSW_REG_PBMC_LEN];
+ int err, i;
+
+ mlxsw_reg_pbmc_pack(pbmc_pl, mlxsw_sp_port->local_port, 0, 0);
+ err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl);
+ if (err)
+ return err;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ u8 pg = old_prio_tc[i];
+
+ if (!mlxsw_sp_ets_has_pg(new_prio_tc, pg))
+ mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, pg, 0);
+ }
+
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl);
+}
+
+static int mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct ieee_ets *ets)
+{
+ bool pause_en = mlxsw_sp_port_is_pause_en(mlxsw_sp_port);
+ struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets;
+ struct net_device *dev = mlxsw_sp_port->dev;
+ int err;
+
+ /* Create the required PGs, but don't destroy existing ones, as
+ * traffic is still directed to them.
+ */
+ err = __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
+ ets->prio_tc, pause_en,
+ mlxsw_sp_port->dcb.pfc);
+ if (err) {
+ netdev_err(dev, "Failed to configure port's headroom\n");
+ return err;
+ }
+
+ err = mlxsw_sp_port_pg_prio_map(mlxsw_sp_port, ets->prio_tc);
+ if (err) {
+ netdev_err(dev, "Failed to set PG-priority mapping\n");
+ goto err_port_prio_pg_map;
+ }
+
+ err = mlxsw_sp_port_pg_destroy(mlxsw_sp_port, my_ets->prio_tc,
+ ets->prio_tc);
+ if (err)
+ netdev_warn(dev, "Failed to remove ununsed PGs\n");
+
+ return 0;
+
+err_port_prio_pg_map:
+ mlxsw_sp_port_pg_destroy(mlxsw_sp_port, ets->prio_tc, my_ets->prio_tc);
+ return err;
+}
+
+static int __mlxsw_sp_dcbnl_ieee_setets(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct ieee_ets *ets)
+{
+ struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets;
+ struct net_device *dev = mlxsw_sp_port->dev;
+ int i, err;
+
+ /* Egress configuration. */
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ bool dwrr = ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS;
+ u8 weight = ets->tc_tx_bw[i];
+
+ err = mlxsw_sp_port_ets_set(mlxsw_sp_port,
+ MLXSW_REG_QEEC_HIERARCY_SUBGROUP, i,
+ 0, dwrr, weight);
+ if (err) {
+ netdev_err(dev, "Failed to link subgroup ETS element %d to group\n",
+ i);
+ goto err_port_ets_set;
+ }
+ }
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ err = mlxsw_sp_port_prio_tc_set(mlxsw_sp_port, i,
+ ets->prio_tc[i]);
+ if (err) {
+ netdev_err(dev, "Failed to map prio %d to TC %d\n", i,
+ ets->prio_tc[i]);
+ goto err_port_prio_tc_set;
+ }
+ }
+
+ /* Ingress configuration. */
+ err = mlxsw_sp_port_headroom_set(mlxsw_sp_port, ets);
+ if (err)
+ goto err_port_headroom_set;
+
+ return 0;
+
+err_port_headroom_set:
+ i = IEEE_8021QAZ_MAX_TCS;
+err_port_prio_tc_set:
+ for (i--; i >= 0; i--)
+ mlxsw_sp_port_prio_tc_set(mlxsw_sp_port, i, my_ets->prio_tc[i]);
+ i = IEEE_8021QAZ_MAX_TCS;
+err_port_ets_set:
+ for (i--; i >= 0; i--) {
+ bool dwrr = my_ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS;
+ u8 weight = my_ets->tc_tx_bw[i];
+
+ err = mlxsw_sp_port_ets_set(mlxsw_sp_port,
+ MLXSW_REG_QEEC_HIERARCY_SUBGROUP, i,
+ 0, dwrr, weight);
+ }
+ return err;
+}
+
+static int mlxsw_sp_dcbnl_ieee_setets(struct net_device *dev,
+ struct ieee_ets *ets)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+ int err;
+
+ err = mlxsw_sp_port_ets_validate(mlxsw_sp_port, ets);
+ if (err)
+ return err;
+
+ err = __mlxsw_sp_dcbnl_ieee_setets(mlxsw_sp_port, ets);
+ if (err)
+ return err;
+
+ memcpy(mlxsw_sp_port->dcb.ets, ets, sizeof(*ets));
+
+ return 0;
+}
+
+static int mlxsw_sp_dcbnl_ieee_getmaxrate(struct net_device *dev,
+ struct ieee_maxrate *maxrate)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+
+ memcpy(maxrate, mlxsw_sp_port->dcb.maxrate, sizeof(*maxrate));
+
+ return 0;
+}
+
+static int mlxsw_sp_dcbnl_ieee_setmaxrate(struct net_device *dev,
+ struct ieee_maxrate *maxrate)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+ struct ieee_maxrate *my_maxrate = mlxsw_sp_port->dcb.maxrate;
+ int err, i;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ err = mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port,
+ MLXSW_REG_QEEC_HIERARCY_SUBGROUP,
+ i, 0,
+ maxrate->tc_maxrate[i]);
+ if (err) {
+ netdev_err(dev, "Failed to set maxrate for TC %d\n", i);
+ goto err_port_ets_maxrate_set;
+ }
+ }
+
+ memcpy(mlxsw_sp_port->dcb.maxrate, maxrate, sizeof(*maxrate));
+
+ return 0;
+
+err_port_ets_maxrate_set:
+ for (i--; i >= 0; i--)
+ mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port,
+ MLXSW_REG_QEEC_HIERARCY_SUBGROUP,
+ i, 0, my_maxrate->tc_maxrate[i]);
+ return err;
+}
+
+static int mlxsw_sp_port_pfc_cnt_get(struct mlxsw_sp_port *mlxsw_sp_port,
+ u8 prio)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ struct ieee_pfc *my_pfc = mlxsw_sp_port->dcb.pfc;
+ char ppcnt_pl[MLXSW_REG_PPCNT_LEN];
+ int err;
+
+ mlxsw_reg_ppcnt_pack(ppcnt_pl, mlxsw_sp_port->local_port,
+ MLXSW_REG_PPCNT_PRIO_CNT, prio);
+ err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(ppcnt), ppcnt_pl);
+ if (err)
+ return err;
+
+ my_pfc->requests[prio] = mlxsw_reg_ppcnt_tx_pause_get(ppcnt_pl);
+ my_pfc->indications[prio] = mlxsw_reg_ppcnt_rx_pause_get(ppcnt_pl);
+
+ return 0;
+}
+
+static int mlxsw_sp_dcbnl_ieee_getpfc(struct net_device *dev,
+ struct ieee_pfc *pfc)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+ int err, i;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+ err = mlxsw_sp_port_pfc_cnt_get(mlxsw_sp_port, i);
+ if (err) {
+ netdev_err(dev, "Failed to get PFC count for priority %d\n",
+ i);
+ return err;
+ }
+ }
+
+ memcpy(pfc, mlxsw_sp_port->dcb.pfc, sizeof(*pfc));
+
+ return 0;
+}
+
+static int mlxsw_sp_port_pfc_set(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct ieee_pfc *pfc)
+{
+ char pfcc_pl[MLXSW_REG_PFCC_LEN];
+
+ mlxsw_reg_pfcc_pack(pfcc_pl, mlxsw_sp_port->local_port);
+ mlxsw_reg_pfcc_prio_pack(pfcc_pl, pfc->pfc_en);
+
+ return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pfcc),
+ pfcc_pl);
+}
+
+static int mlxsw_sp_dcbnl_ieee_setpfc(struct net_device *dev,
+ struct ieee_pfc *pfc)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+ int err;
+
+ if (mlxsw_sp_port->link.tx_pause || mlxsw_sp_port->link.rx_pause) {
+ netdev_err(dev, "PAUSE frames already enabled on port\n");
+ return -EINVAL;
+ }
+
+ err = __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
+ mlxsw_sp_port->dcb.ets->prio_tc,
+ false, pfc);
+ if (err) {
+ netdev_err(dev, "Failed to configure port's headroom for PFC\n");
+ return err;
+ }
+
+ err = mlxsw_sp_port_pfc_set(mlxsw_sp_port, pfc);
+ if (err) {
+ netdev_err(dev, "Failed to configure PFC\n");
+ goto err_port_pfc_set;
+ }
+
+ memcpy(mlxsw_sp_port->dcb.pfc, pfc, sizeof(*pfc));
+
+ return 0;
+
+err_port_pfc_set:
+ __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
+ mlxsw_sp_port->dcb.ets->prio_tc, false,
+ mlxsw_sp_port->dcb.pfc);
+ return err;
+}
+
+static const struct dcbnl_rtnl_ops mlxsw_sp_dcbnl_ops = {
+ .ieee_getets = mlxsw_sp_dcbnl_ieee_getets,
+ .ieee_setets = mlxsw_sp_dcbnl_ieee_setets,
+ .ieee_getmaxrate = mlxsw_sp_dcbnl_ieee_getmaxrate,
+ .ieee_setmaxrate = mlxsw_sp_dcbnl_ieee_setmaxrate,
+ .ieee_getpfc = mlxsw_sp_dcbnl_ieee_getpfc,
+ .ieee_setpfc = mlxsw_sp_dcbnl_ieee_setpfc,
+
+ .getdcbx = mlxsw_sp_dcbnl_getdcbx,
+ .setdcbx = mlxsw_sp_dcbnl_setdcbx,
+};
+
+static int mlxsw_sp_port_ets_init(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ mlxsw_sp_port->dcb.ets = kzalloc(sizeof(*mlxsw_sp_port->dcb.ets),
+ GFP_KERNEL);
+ if (!mlxsw_sp_port->dcb.ets)
+ return -ENOMEM;
+
+ mlxsw_sp_port->dcb.ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
+
+ return 0;
+}
+
+static void mlxsw_sp_port_ets_fini(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ kfree(mlxsw_sp_port->dcb.ets);
+}
+
+static int mlxsw_sp_port_maxrate_init(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ int i;
+
+ mlxsw_sp_port->dcb.maxrate = kmalloc(sizeof(*mlxsw_sp_port->dcb.maxrate),
+ GFP_KERNEL);
+ if (!mlxsw_sp_port->dcb.maxrate)
+ return -ENOMEM;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
+ mlxsw_sp_port->dcb.maxrate->tc_maxrate[i] = MLXSW_REG_QEEC_MAS_DIS;
+
+ return 0;
+}
+
+static void mlxsw_sp_port_maxrate_fini(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ kfree(mlxsw_sp_port->dcb.maxrate);
+}
+
+static int mlxsw_sp_port_pfc_init(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ mlxsw_sp_port->dcb.pfc = kzalloc(sizeof(*mlxsw_sp_port->dcb.pfc),
+ GFP_KERNEL);
+ if (!mlxsw_sp_port->dcb.pfc)
+ return -ENOMEM;
+
+ mlxsw_sp_port->dcb.pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
+
+ return 0;
+}
+
+static void mlxsw_sp_port_pfc_fini(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ kfree(mlxsw_sp_port->dcb.pfc);
+}
+
+int mlxsw_sp_port_dcb_init(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ int err;
+
+ err = mlxsw_sp_port_ets_init(mlxsw_sp_port);
+ if (err)
+ return err;
+ err = mlxsw_sp_port_maxrate_init(mlxsw_sp_port);
+ if (err)
+ goto err_port_maxrate_init;
+ err = mlxsw_sp_port_pfc_init(mlxsw_sp_port);
+ if (err)
+ goto err_port_pfc_init;
+
+ mlxsw_sp_port->dev->dcbnl_ops = &mlxsw_sp_dcbnl_ops;
+
+ return 0;
+
+err_port_pfc_init:
+ mlxsw_sp_port_maxrate_fini(mlxsw_sp_port);
+err_port_maxrate_init:
+ mlxsw_sp_port_ets_fini(mlxsw_sp_port);
+ return err;
+}
+
+void mlxsw_sp_port_dcb_fini(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+ mlxsw_sp_port_pfc_fini(mlxsw_sp_port);
+ mlxsw_sp_port_maxrate_fini(mlxsw_sp_port);
+ mlxsw_sp_port_ets_fini(mlxsw_sp_port);
+}