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* 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_pack(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));
mlxsw_sp_port->dcb.ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
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_pprx_set(pfcc_pl, mlxsw_sp_port->link.rx_pause);
mlxsw_reg_pfcc_pptx_set(pfcc_pl, mlxsw_sp_port->link.tx_pause);
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);
bool pause_en = mlxsw_sp_port_is_pause_en(mlxsw_sp_port);
int err;
if (pause_en && pfc->pfc_en) {
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,
pause_en, 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));
mlxsw_sp_port->dcb.pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
return 0;
err_port_pfc_set:
__mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
mlxsw_sp_port->dcb.ets->prio_tc, pause_en,
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);
}
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