drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c - arm/linux - Git at Google

 /*
  * Copyright (c) 2011 Mellanox Technologies. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - 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.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  *
  */

 #include <linux/dcbnl.h>
 #include <linux/math64.h>

 #include "mlx4_en.h"

 static int mlx4_en_dcbnl_ieee_getets(struct net_device *dev,
 				   struct ieee_ets *ets)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct ieee_ets *my_ets = &priv->ets;

 	/* No IEEE PFC settings available */
 	if (!my_ets)
 		return -EINVAL;

 	ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
 	ets->cbs = my_ets->cbs;
 	memcpy(ets->tc_tx_bw, my_ets->tc_tx_bw, sizeof(ets->tc_tx_bw));
 	memcpy(ets->tc_tsa, my_ets->tc_tsa, sizeof(ets->tc_tsa));
 	memcpy(ets->prio_tc, my_ets->prio_tc, sizeof(ets->prio_tc));

 	return 0;
 }

 static int mlx4_en_ets_validate(struct mlx4_en_priv *priv, struct ieee_ets *ets)
 {
 	int i;
 	int total_ets_bw = 0;
 	int has_ets_tc = 0;

 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 		if (ets->prio_tc[i] > MLX4_EN_NUM_UP) {
 			en_err(priv, "Bad priority in UP <=> TC mapping. TC: %d, UP: %d\n",
 					i, ets->prio_tc[i]);
 			return -EINVAL;
 		}

 		switch (ets->tc_tsa[i]) {
 		case IEEE_8021QAZ_TSA_STRICT:
 			break;
 		case IEEE_8021QAZ_TSA_ETS:
 			has_ets_tc = 1;
 			total_ets_bw += ets->tc_tx_bw[i];
 			break;
 		default:
 			en_err(priv, "TC[%d]: Not supported TSA: %d\n",
 					i, ets->tc_tsa[i]);
 			return -ENOTSUPP;
 		}
 	}

 	if (has_ets_tc && total_ets_bw != MLX4_EN_BW_MAX) {
 		en_err(priv, "Bad ETS BW sum: %d. Should be exactly 100%%\n",
 				total_ets_bw);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int mlx4_en_config_port_scheduler(struct mlx4_en_priv *priv,
 		struct ieee_ets *ets, u16 *ratelimit)
 {
 	struct mlx4_en_dev *mdev = priv->mdev;
 	int num_strict = 0;
 	int i;
 	__u8 tc_tx_bw[IEEE_8021QAZ_MAX_TCS] = { 0 };
 	__u8 pg[IEEE_8021QAZ_MAX_TCS] = { 0 };

 	ets = ets ?: &priv->ets;
 	ratelimit = ratelimit ?: priv->maxrate;

 	/* higher TC means higher priority => lower pg */
 	for (i = IEEE_8021QAZ_MAX_TCS - 1; i >= 0; i--) {
 		switch (ets->tc_tsa[i]) {
 		case IEEE_8021QAZ_TSA_STRICT:
 			pg[i] = num_strict++;
 			tc_tx_bw[i] = MLX4_EN_BW_MAX;
 			break;
 		case IEEE_8021QAZ_TSA_ETS:
 			pg[i] = MLX4_EN_TC_ETS;
 			tc_tx_bw[i] = ets->tc_tx_bw[i] ?: MLX4_EN_BW_MIN;
 			break;
 		}
 	}

 	return mlx4_SET_PORT_SCHEDULER(mdev->dev, priv->port, tc_tx_bw, pg,
 			ratelimit);
 }

 static int
 mlx4_en_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct mlx4_en_dev *mdev = priv->mdev;
 	int err;

 	err = mlx4_en_ets_validate(priv, ets);
 	if (err)
 		return err;

 	err = mlx4_SET_PORT_PRIO2TC(mdev->dev, priv->port, ets->prio_tc);
 	if (err)
 		return err;

 	err = mlx4_en_config_port_scheduler(priv, ets, NULL);
 	if (err)
 		return err;

 	memcpy(&priv->ets, ets, sizeof(priv->ets));

 	return 0;
 }

 static int mlx4_en_dcbnl_ieee_getpfc(struct net_device *dev,
 		struct ieee_pfc *pfc)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);

 	pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
 	pfc->pfc_en = priv->prof->tx_ppp;

 	return 0;
 }

 static int mlx4_en_dcbnl_ieee_setpfc(struct net_device *dev,
 		struct ieee_pfc *pfc)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct mlx4_en_port_profile *prof = priv->prof;
 	struct mlx4_en_dev *mdev = priv->mdev;
 	int err;

 	en_dbg(DRV, priv, "cap: 0x%x en: 0x%x mbc: 0x%x delay: %d\n",
 			pfc->pfc_cap,
 			pfc->pfc_en,
 			pfc->mbc,
 			pfc->delay);

 	prof->rx_pause = !pfc->pfc_en;
 	prof->tx_pause = !pfc->pfc_en;
 	prof->rx_ppp = pfc->pfc_en;
 	prof->tx_ppp = pfc->pfc_en;

 	err = mlx4_SET_PORT_general(mdev->dev, priv->port,
 				    priv->rx_skb_size + ETH_FCS_LEN,
 				    prof->tx_pause,
 				    prof->tx_ppp,
 				    prof->rx_pause,
 				    prof->rx_ppp);
 	if (err)
 		en_err(priv, "Failed setting pause params\n");

 	return err;
 }

 static u8 mlx4_en_dcbnl_getdcbx(struct net_device *dev)
 {
 	return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
 }

 static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode)
 {
 	if ((mode & DCB_CAP_DCBX_LLD_MANAGED) ||
 	    (mode & DCB_CAP_DCBX_VER_CEE) ||
 	    !(mode & DCB_CAP_DCBX_VER_IEEE) ||
 	    !(mode & DCB_CAP_DCBX_HOST))
 		return 1;

 	return 0;
 }

 #define MLX4_RATELIMIT_UNITS_IN_KB 100000 /* rate-limit HW unit in Kbps */
 static int mlx4_en_dcbnl_ieee_getmaxrate(struct net_device *dev,
 				   struct ieee_maxrate *maxrate)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	int i;

 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
 		maxrate->tc_maxrate[i] =
 			priv->maxrate[i] * MLX4_RATELIMIT_UNITS_IN_KB;

 	return 0;
 }

 static int mlx4_en_dcbnl_ieee_setmaxrate(struct net_device *dev,
 		struct ieee_maxrate *maxrate)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	u16 tmp[IEEE_8021QAZ_MAX_TCS];
 	int i, err;

 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 		/* Convert from Kbps into HW units, rounding result up.
 		 * Setting to 0, means unlimited BW.
 		 */
 		tmp[i] = div_u64(maxrate->tc_maxrate[i] +
 				 MLX4_RATELIMIT_UNITS_IN_KB - 1,
 				 MLX4_RATELIMIT_UNITS_IN_KB);
 	}

 	err = mlx4_en_config_port_scheduler(priv, NULL, tmp);
 	if (err)
 		return err;

 	memcpy(priv->maxrate, tmp, sizeof(priv->maxrate));

 	return 0;
 }

 const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops = {
 	.ieee_getets	= mlx4_en_dcbnl_ieee_getets,
 	.ieee_setets	= mlx4_en_dcbnl_ieee_setets,
 	.ieee_getmaxrate = mlx4_en_dcbnl_ieee_getmaxrate,
 	.ieee_setmaxrate = mlx4_en_dcbnl_ieee_setmaxrate,
 	.ieee_getpfc	= mlx4_en_dcbnl_ieee_getpfc,
 	.ieee_setpfc	= mlx4_en_dcbnl_ieee_setpfc,

 	.getdcbx	= mlx4_en_dcbnl_getdcbx,
 	.setdcbx	= mlx4_en_dcbnl_setdcbx,
 };

 const struct dcbnl_rtnl_ops mlx4_en_dcbnl_pfc_ops = {
 	.ieee_getpfc	= mlx4_en_dcbnl_ieee_getpfc,
 	.ieee_setpfc	= mlx4_en_dcbnl_ieee_setpfc,

 	.getdcbx	= mlx4_en_dcbnl_getdcbx,
 	.setdcbx	= mlx4_en_dcbnl_setdcbx,
 };
	/*
	* Copyright (c) 2011 Mellanox Technologies. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - 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.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*
	*/

	#include <linux/dcbnl.h>
	#include <linux/math64.h>

	#include "mlx4_en.h"

	static int mlx4_en_dcbnl_ieee_getets(struct net_device *dev,
	struct ieee_ets *ets)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);
	struct ieee_ets *my_ets = &priv->ets;

	/* No IEEE PFC settings available */
	if (!my_ets)
	return -EINVAL;

	ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
	ets->cbs = my_ets->cbs;
	memcpy(ets->tc_tx_bw, my_ets->tc_tx_bw, sizeof(ets->tc_tx_bw));
	memcpy(ets->tc_tsa, my_ets->tc_tsa, sizeof(ets->tc_tsa));
	memcpy(ets->prio_tc, my_ets->prio_tc, sizeof(ets->prio_tc));

	return 0;
	}

	static int mlx4_en_ets_validate(struct mlx4_en_priv priv, struct ieee_ets ets)
	{
	int i;
	int total_ets_bw = 0;
	int has_ets_tc = 0;

	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
	if (ets->prio_tc[i] > MLX4_EN_NUM_UP) {
	en_err(priv, "Bad priority in UP <=> TC mapping. TC: %d, UP: %d\n",
	i, ets->prio_tc[i]);
	return -EINVAL;
	}

	switch (ets->tc_tsa[i]) {
	case IEEE_8021QAZ_TSA_STRICT:
	break;
	case IEEE_8021QAZ_TSA_ETS:
	has_ets_tc = 1;
	total_ets_bw += ets->tc_tx_bw[i];
	break;
	default:
	en_err(priv, "TC[%d]: Not supported TSA: %d\n",
	i, ets->tc_tsa[i]);
	return -ENOTSUPP;
	}
	}

	if (has_ets_tc && total_ets_bw != MLX4_EN_BW_MAX) {
	en_err(priv, "Bad ETS BW sum: %d. Should be exactly 100%%\n",
	total_ets_bw);
	return -EINVAL;
	}

	return 0;
	}

	static int mlx4_en_config_port_scheduler(struct mlx4_en_priv *priv,
	struct ieee_ets ets, u16 ratelimit)
	{
	struct mlx4_en_dev *mdev = priv->mdev;
	int num_strict = 0;
	int i;
	__u8 tc_tx_bw[IEEE_8021QAZ_MAX_TCS] = { 0 };
	__u8 pg[IEEE_8021QAZ_MAX_TCS] = { 0 };

	ets = ets ?: &priv->ets;
	ratelimit = ratelimit ?: priv->maxrate;

	/* higher TC means higher priority => lower pg */
	for (i = IEEE_8021QAZ_MAX_TCS - 1; i >= 0; i--) {
	switch (ets->tc_tsa[i]) {
	case IEEE_8021QAZ_TSA_STRICT:
	pg[i] = num_strict++;
	tc_tx_bw[i] = MLX4_EN_BW_MAX;
	break;
	case IEEE_8021QAZ_TSA_ETS:
	pg[i] = MLX4_EN_TC_ETS;
	tc_tx_bw[i] = ets->tc_tx_bw[i] ?: MLX4_EN_BW_MIN;
	break;
	}
	}

	return mlx4_SET_PORT_SCHEDULER(mdev->dev, priv->port, tc_tx_bw, pg,
	ratelimit);
	}

	static int
	mlx4_en_dcbnl_ieee_setets(struct net_device dev, struct ieee_ets ets)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);
	struct mlx4_en_dev *mdev = priv->mdev;
	int err;

	err = mlx4_en_ets_validate(priv, ets);
	if (err)
	return err;

	err = mlx4_SET_PORT_PRIO2TC(mdev->dev, priv->port, ets->prio_tc);
	if (err)
	return err;

	err = mlx4_en_config_port_scheduler(priv, ets, NULL);
	if (err)
	return err;

	memcpy(&priv->ets, ets, sizeof(priv->ets));

	return 0;
	}

	static int mlx4_en_dcbnl_ieee_getpfc(struct net_device *dev,
	struct ieee_pfc *pfc)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);

	pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
	pfc->pfc_en = priv->prof->tx_ppp;

	return 0;
	}

	static int mlx4_en_dcbnl_ieee_setpfc(struct net_device *dev,
	struct ieee_pfc *pfc)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);
	struct mlx4_en_port_profile *prof = priv->prof;
	struct mlx4_en_dev *mdev = priv->mdev;
	int err;

	en_dbg(DRV, priv, "cap: 0x%x en: 0x%x mbc: 0x%x delay: %d\n",
	pfc->pfc_cap,
	pfc->pfc_en,
	pfc->mbc,
	pfc->delay);

	prof->rx_pause = !pfc->pfc_en;
	prof->tx_pause = !pfc->pfc_en;
	prof->rx_ppp = pfc->pfc_en;
	prof->tx_ppp = pfc->pfc_en;

	err = mlx4_SET_PORT_general(mdev->dev, priv->port,
	priv->rx_skb_size + ETH_FCS_LEN,
	prof->tx_pause,
	prof->tx_ppp,
	prof->rx_pause,
	prof->rx_ppp);
	if (err)
	en_err(priv, "Failed setting pause params\n");

	return err;
	}

	static u8 mlx4_en_dcbnl_getdcbx(struct net_device *dev)
	{
	return DCB_CAP_DCBX_HOST \| DCB_CAP_DCBX_VER_IEEE;
	}

	static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode)
	{
	if ((mode & DCB_CAP_DCBX_LLD_MANAGED) \|\|
	(mode & DCB_CAP_DCBX_VER_CEE) \|\|
	!(mode & DCB_CAP_DCBX_VER_IEEE) \|\|
	!(mode & DCB_CAP_DCBX_HOST))
	return 1;

	return 0;
	}

	#define MLX4_RATELIMIT_UNITS_IN_KB 100000 /* rate-limit HW unit in Kbps */
	static int mlx4_en_dcbnl_ieee_getmaxrate(struct net_device *dev,
	struct ieee_maxrate *maxrate)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);
	int i;

	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
	maxrate->tc_maxrate[i] =
	priv->maxrate[i] * MLX4_RATELIMIT_UNITS_IN_KB;

	return 0;
	}

	static int mlx4_en_dcbnl_ieee_setmaxrate(struct net_device *dev,
	struct ieee_maxrate *maxrate)
	{
	struct mlx4_en_priv *priv = netdev_priv(dev);
	u16 tmp[IEEE_8021QAZ_MAX_TCS];
	int i, err;

	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
	/* Convert from Kbps into HW units, rounding result up.
	* Setting to 0, means unlimited BW.
	*/
	tmp[i] = div_u64(maxrate->tc_maxrate[i] +
	MLX4_RATELIMIT_UNITS_IN_KB - 1,
	MLX4_RATELIMIT_UNITS_IN_KB);
	}

	err = mlx4_en_config_port_scheduler(priv, NULL, tmp);
	if (err)
	return err;

	memcpy(priv->maxrate, tmp, sizeof(priv->maxrate));

	return 0;
	}

	const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops = {
	.ieee_getets = mlx4_en_dcbnl_ieee_getets,
	.ieee_setets = mlx4_en_dcbnl_ieee_setets,
	.ieee_getmaxrate = mlx4_en_dcbnl_ieee_getmaxrate,
	.ieee_setmaxrate = mlx4_en_dcbnl_ieee_setmaxrate,
	.ieee_getpfc = mlx4_en_dcbnl_ieee_getpfc,
	.ieee_setpfc = mlx4_en_dcbnl_ieee_setpfc,

	.getdcbx = mlx4_en_dcbnl_getdcbx,
	.setdcbx = mlx4_en_dcbnl_setdcbx,
	};

	const struct dcbnl_rtnl_ops mlx4_en_dcbnl_pfc_ops = {
	.ieee_getpfc = mlx4_en_dcbnl_ieee_getpfc,
	.ieee_setpfc = mlx4_en_dcbnl_ieee_setpfc,

	.getdcbx = mlx4_en_dcbnl_getdcbx,
	.setdcbx = mlx4_en_dcbnl_setdcbx,
	};