Date:   Fri, 29 Sep 2017 13:36:04 +0000
From:   Bogdan Purcareata <bogdan.purcareata@....com>
To:     Razvan Stefanescu <razvan.stefanescu@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "agraf@...e.de" <agraf@...e.de>, "arnd@...db.de" <arnd@...db.de>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "stuyoder@...il.com" <stuyoder@...il.com>
Subject: RE: [RESEND PATCH 2/6] staging: fsl-dpaa2/ethsw: Add Freescale DPAA2
 Ethernet Switch driver

> Introduce the DPAA2 Ethernet Switch driver, which manages Datapath Switch
> (DPSW) objects discovered on the MC bus.
> 
> Suggested-by: Alexandru Marginean <alexandru.marginean@....com>
> Signed-off-by: Razvan Stefanescu <razvan.stefanescu@....com>
> ---
>  drivers/staging/fsl-dpaa2/ethsw/Makefile |    2 +-
>  drivers/staging/fsl-dpaa2/ethsw/ethsw.c  | 1523 ++++++++++++++++++++++++++++++
>  drivers/staging/fsl-dpaa2/ethsw/ethsw.h  |   88 ++
>  3 files changed, 1612 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/staging/fsl-dpaa2/ethsw/ethsw.c
>  create mode 100644 drivers/staging/fsl-dpaa2/ethsw/ethsw.h
> 
> diff --git a/drivers/staging/fsl-dpaa2/ethsw/Makefile b/drivers/staging/fsl-
> dpaa2/ethsw/Makefile
> index db137f7..a6d72d1 100644
> --- a/drivers/staging/fsl-dpaa2/ethsw/Makefile
> +++ b/drivers/staging/fsl-dpaa2/ethsw/Makefile
> @@ -4,4 +4,4 @@
> 
>  obj-$(CONFIG_FSL_DPAA2_ETHSW) += dpaa2-ethsw.o
> 
> -dpaa2-ethsw-objs := dpsw.o
> +dpaa2-ethsw-objs := ethsw.o dpsw.o
> diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c b/drivers/staging/fsl-
> dpaa2/ethsw/ethsw.c
> new file mode 100644
> index 0000000..ae86078
> --- /dev/null
> +++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
> @@ -0,0 +1,1523 @@
> +/* Copyright 2014-2016 Freescale Semiconductor Inc.
> + * Copyright 2017 NXP
> + *
> + * 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.
> + *     * Neither the name of the above-listed copyright holders nor the
> + *	 names of any 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") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * 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 HOLDERS 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/module.h>
> +
> +#include <linux/interrupt.h>
> +#include <linux/msi.h>
> +#include <linux/kthread.h>
> +#include <linux/workqueue.h>
> +
> +#include "../../fsl-mc/include/mc.h"
> +
> +#include "ethsw.h"
> +
> +static struct workqueue_struct *ethsw_owq;
> +
> +/* Minimal supported DPSW version */
> +#define DPSW_MIN_VER_MAJOR		8
> +#define DPSW_MIN_VER_MINOR		0
> +
> +#define DEFAULT_VLAN_ID			1
> +
> +static int ethsw_add_vlan(struct ethsw_core *ethsw, u16 vid)
> +{
> +	int err;
> +
> +	struct dpsw_vlan_cfg	vcfg = {
> +		.fdb_id = 0,
> +	};
> +
> +	if (ethsw->vlans[vid]) {
> +		dev_err(ethsw->dev, "VLAN already configured\n");
> +		return -EEXIST;
> +	}
> +
> +	err = dpsw_vlan_add(ethsw->mc_io, 0,
> +			    ethsw->dpsw_handle, vid, &vcfg);
> +	if (err) {
> +		dev_err(ethsw->dev, "dpsw_vlan_add err %d\n", err);
> +		return err;
> +	}
> +	ethsw->vlans[vid] = ETHSW_VLAN_MEMBER;/
> +
> +	return 0;
> +}
> +
> +static int ethsw_port_add_vlan(struct ethsw_port_priv *port_priv,
> +			       u16 vid, u16 flags)
> +{
> +	struct ethsw_core *ethsw = port_priv->ethsw_data;
> +	struct net_device *netdev = port_priv->netdev;
> +	struct dpsw_vlan_if_cfg vcfg;
> +	bool is_oper;
> +	int err, err2;

Mild suggestion - s/err2/ret/, just because it sounds better, at least to me (same for similar situations in the rest of the file).

> +
> +	if (port_priv->vlans[vid]) {
> +		netdev_warn(netdev, "VLAN %d already configured\n", vid);
> +		return -EEXIST;
> +	}
> +
> +	vcfg.num_ifs = 1;
> +	vcfg.if_id[0] = port_priv->idx;
> +	err = dpsw_vlan_add_if(ethsw->mc_io, 0, ethsw->dpsw_handle, vid, &vcfg);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_vlan_add_if err %d\n", err);
> +		return err;
> +	}
> +
> +	port_priv->vlans[vid] = ETHSW_VLAN_MEMBER;
> +
> +	if (flags & BRIDGE_VLAN_INFO_UNTAGGED) {
> +		err = dpsw_vlan_add_if_untagged(ethsw->mc_io, 0,
> +						ethsw->dpsw_handle,
> +						vid, &vcfg);
> +		if (err) {
> +			netdev_err(netdev,
> +				   "dpsw_vlan_add_if_untagged err %d\n", err);
> +			return err;
> +		}
> +		port_priv->vlans[vid] |= ETHSW_VLAN_UNTAGGED;
> +	}
> +
> +	if (flags & BRIDGE_VLAN_INFO_PVID) {
> +		struct dpsw_tci_cfg tci_cfg = {
> +			.pcp = 0,
> +			.dei = 0,
> +			.vlan_id = vid,
> +		};
> +
> +		/* Interface needs to be down to change PVID */
> +		is_oper = netif_oper_up(netdev);
> +		if (is_oper) {
> +			err = dpsw_if_disable(ethsw->mc_io, 0,
> +					      ethsw->dpsw_handle,
> +					      port_priv->idx);
> +			if (err) {
> +				netdev_err(netdev,
> +					   "dpsw_if_disable err %d\n", err);
> +				return err;
> +			}
> +		}
> +
> +		err = dpsw_if_set_tci(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				      port_priv->idx, &tci_cfg);
> +		if (!err) {
> +			/* Delete previous PVID info and mark the new one */
> +			if (port_priv->pvid)
> +				port_priv->vlans[port_priv->pvid]
> +						 ^= ETHSW_VLAN_PVID;

Can it be " &= ~ETHSW_VLAN_PVID" ? Are there other implications?

> +
> +			port_priv->vlans[vid] |= ETHSW_VLAN_PVID;
> +			port_priv->pvid = vid;
> +		} else {
> +			netdev_err(netdev, "dpsw_if_set_tci err %d\n", err);
> +		}
> +
> +		if (is_oper) {
> +			err2 = dpsw_if_enable(ethsw->mc_io, 0,
> +					      ethsw->dpsw_handle,
> +					      port_priv->idx);
> +			if (err2) {
> +				netdev_err(netdev,
> +					   "dpsw_if_enable err %d\n", err2);
> +				return err2;
> +			}
> +		}
> +	}
> +
> +	return err;
> +}
> +
> +static int ethsw_set_learning(struct ethsw_core *ethsw, u8 flag)
> +{
> +	enum dpsw_fdb_learning_mode learn_mode;
> +	int err;
> +
> +	if (flag)
> +		learn_mode = DPSW_FDB_LEARNING_MODE_HW;
> +	else
> +		learn_mode = DPSW_FDB_LEARNING_MODE_DIS;
> +
> +	err = dpsw_fdb_set_learning_mode(ethsw->mc_io, 0, ethsw->dpsw_handle, 0,
> +					 learn_mode);
> +	if (err) {
> +		dev_err(ethsw->dev, "dpsw_fdb_set_learning_mode err %d\n", err);
> +		return err;
> +	}
> +	ethsw->learning = !!flag;
> +
> +	return 0;
> +}
> +
> +static int ethsw_port_set_flood(struct ethsw_port_priv *port_priv, u8 flag)
> +{
> +	int err;
> +
> +	err = dpsw_if_set_flooding(port_priv->ethsw_data->mc_io, 0,
> +				   port_priv->ethsw_data->dpsw_handle,
> +				   port_priv->idx, (int)flag);

Why is this cast necessary? Can't the API be reworked to use u8 (or, better yet, bool) instead of int?

> +	if (err) {
> +		netdev_err(port_priv->netdev,
> +			   "dpsw_fdb_set_learning_mode err %d\n", err);
> +		return err;
> +	}
> +	port_priv->flood = !!flag;
> +
> +	return 0;
> +}
> +
> +static int ethsw_port_set_stp_state(struct ethsw_port_priv *port_priv, u8
> state)
> +{
> +	struct dpsw_stp_cfg stp_cfg = {
> +		.vlan_id = DEFAULT_VLAN_ID,
> +		.state = state,
> +	};
> +	int err;
> +
> +	if (!netif_oper_up(port_priv->netdev) || state == port_priv->stp_state)
> +		return 0;	/* Nothing to do */
> +
> +	err = dpsw_if_set_stp(port_priv->ethsw_data->mc_io, 0,
> +			      port_priv->ethsw_data->dpsw_handle,
> +			      port_priv->idx, &stp_cfg);
> +	if (err) {
> +		netdev_err(port_priv->netdev,
> +			   "dpsw_if_set_stp err %d\n", err);
> +		return err;
> +	}
> +
> +	port_priv->stp_state = state;
> +
> +	return 0;
> +}
> +
> +static int ethsw_dellink_switch(struct ethsw_core *ethsw, u16 vid)
> +{
> +	struct ethsw_port_priv *ppriv_local = NULL;
> +	int i, err;
> +
> +	if (!ethsw->vlans[vid])
> +		return -ENOENT;
> +
> +	err = dpsw_vlan_remove(ethsw->mc_io, 0, ethsw->dpsw_handle, vid);
> +	if (err) {
> +		dev_err(ethsw->dev, "dpsw_vlan_remove err %d\n", err);
> +		return err;
> +	}
> +	ethsw->vlans[vid] = 0;
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		ppriv_local = ethsw->ports[i];
> +		ppriv_local->vlans[vid] = 0;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ethsw_port_fdb_add_uc(struct ethsw_port_priv *port_priv,
> +				 const unsigned char *addr)
> +{
> +	struct dpsw_fdb_unicast_cfg entry = {0};
> +	int err;
> +
> +	entry.if_egress = port_priv->idx;
> +	entry.type = DPSW_FDB_ENTRY_STATIC;
> +	ether_addr_copy(entry.mac_addr, addr);
> +
> +	err = dpsw_fdb_add_unicast(port_priv->ethsw_data->mc_io, 0,
> +				   port_priv->ethsw_data->dpsw_handle,
> +				   0, &entry);
> +	if (err)
> +		netdev_err(port_priv->netdev,
> +			   "dpsw_fdb_add_unicast err %d\n", err);
> +	return err;
> +}
> +
> +static int ethsw_port_fdb_del_uc(struct ethsw_port_priv *port_priv,
> +				 const unsigned char *addr)
> +{
> +	struct dpsw_fdb_unicast_cfg entry = {0};
> +	int err;
> +
> +	entry.if_egress = port_priv->idx;
> +	entry.type = DPSW_FDB_ENTRY_STATIC;
> +	ether_addr_copy(entry.mac_addr, addr);
> +
> +	err = dpsw_fdb_remove_unicast(port_priv->ethsw_data->mc_io, 0,
> +				      port_priv->ethsw_data->dpsw_handle,
> +				      0, &entry);
> +	if (err)
> +		netdev_err(port_priv->netdev,
> +			   "dpsw_fdb_remove_unicast err %d\n", err);
> +	return err;
> +}
> +
> +static int ethsw_port_fdb_add_mc(struct ethsw_port_priv *port_priv,
> +				 const unsigned char *addr)
> +{
> +	struct dpsw_fdb_multicast_cfg entry = {0};
> +	int err;
> +
> +	ether_addr_copy(entry.mac_addr, addr);
> +	entry.type = DPSW_FDB_ENTRY_STATIC;
> +	entry.num_ifs = 1;
> +	entry.if_id[0] = port_priv->idx;
> +
> +	err = dpsw_fdb_add_multicast(port_priv->ethsw_data->mc_io, 0,
> +				     port_priv->ethsw_data->dpsw_handle,
> +				     0, &entry);
> +	if (err)
> +		netdev_err(port_priv->netdev, "dpsw_fdb_add_multicast err %d\n",
> +			   err);
> +	return err;
> +}
> +
> +static int ethsw_port_fdb_del_mc(struct ethsw_port_priv *port_priv,
> +				 const unsigned char *addr)
> +{
> +	struct dpsw_fdb_multicast_cfg entry = {0};
> +	int err;
> +
> +	ether_addr_copy(entry.mac_addr, addr);
> +	entry.type = DPSW_FDB_ENTRY_STATIC;
> +	entry.num_ifs = 1;
> +	entry.if_id[0] = port_priv->idx;
> +
> +	err = dpsw_fdb_remove_multicast(port_priv->ethsw_data->mc_io, 0,
> +					port_priv->ethsw_data->dpsw_handle,
> +					0, &entry);
> +	if (err)
> +		netdev_err(port_priv->netdev,
> +			   "dpsw_fdb_remove_multicast err %d\n", err);
> +	return err;
> +}
> +
> +static void port_get_stats(struct net_device *netdev,
> +			   struct rtnl_link_stats64 *stats)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	u64 tmp;
> +	int err;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_ING_FRAME, &stats->rx_packets);
> +	if (err)
> +		goto error;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_EGR_FRAME, &stats->tx_packets);
> +	if (err)
> +		goto error;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_ING_BYTE, &stats->rx_bytes);
> +	if (err)
> +		goto error;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_EGR_BYTE, &stats->tx_bytes);
> +	if (err)
> +		goto error;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_ING_FRAME_DISCARD,
> +				  &stats->rx_dropped);
> +	if (err)
> +		goto error;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_ING_FLTR_FRAME,
> +				  &tmp);
> +	if (err)
> +		goto error;
> +	stats->rx_dropped += tmp;
> +
> +	err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
> +				  port_priv->ethsw_data->dpsw_handle,
> +				  port_priv->idx,
> +				  DPSW_CNT_EGR_FRAME_DISCARD,
> +				  &stats->tx_dropped);
> +	if (err)
> +		goto error;
> +
> +	return;
> +
> +error:
> +	netdev_err(netdev, "dpsw_if_get_counter err %d\n", err);
> +}
> +
> +static bool port_has_offload_stats(const struct net_device *netdev,
> +				   int attr_id)
> +{
> +	return (attr_id == IFLA_OFFLOAD_XSTATS_CPU_HIT);
> +}
> +
> +static int port_get_offload_stats(int attr_id,
> +				  const struct net_device *netdev,
> +				  void *sp)
> +{
> +	switch (attr_id) {
> +	case IFLA_OFFLOAD_XSTATS_CPU_HIT:
> +		port_get_stats((struct net_device *)netdev, sp);
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int port_change_mtu(struct net_device *netdev, int mtu)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err;
> +
> +	err = dpsw_if_set_max_frame_length(port_priv->ethsw_data->mc_io,
> +					   0,
> +					   port_priv->ethsw_data->dpsw_handle,
> +					   port_priv->idx,
> +					   (u16)ETHSW_L2_MAX_FRM(mtu));
> +	if (err) {
> +		netdev_err(netdev,
> +			   "dpsw_if_set_max_frame_length() err %d\n", err);
> +		return err;
> +	}
> +
> +	netdev->mtu = mtu;
> +	return 0;
> +}
> +
> +static int port_carrier_state_sync(struct net_device *netdev)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	struct dpsw_link_state state;
> +	int err;
> +
> +	err = dpsw_if_get_link_state(port_priv->ethsw_data->mc_io, 0,
> +				     port_priv->ethsw_data->dpsw_handle,
> +				     port_priv->idx, &state);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_if_get_link_state() err %d\n", err);
> +		return err;
> +	}
> +
> +	WARN_ONCE(state.up > 1, "Garbage read into link_state");
> +
> +	if (state.up != port_priv->link_state) {
> +		if (state.up)
> +			netif_carrier_on(netdev);
> +		else
> +			netif_carrier_off(netdev);
> +		port_priv->link_state = state.up;
> +	}
> +	return 0;
> +}
> +
> +static int port_open(struct net_device *netdev)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err;
> +
> +	/* No need to allow Tx as control interface is disabled */
> +	netif_tx_stop_all_queues(netdev);
> +
> +	err = dpsw_if_enable(port_priv->ethsw_data->mc_io, 0,
> +			     port_priv->ethsw_data->dpsw_handle,
> +			     port_priv->idx);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_if_enable err %d\n", err);
> +		return err;
> +	}
> +
> +	/* sync carrier state */
> +	err = port_carrier_state_sync(netdev);
> +	if (err) {
> +		netdev_err(netdev,
> +			   "port_carrier_state_sync err %d\n", err);
> +		goto err_carrier_sync;
> +	}
> +
> +	return 0;
> +
> +err_carrier_sync:
> +	dpsw_if_disable(port_priv->ethsw_data->mc_io, 0,
> +			port_priv->ethsw_data->dpsw_handle,
> +			port_priv->idx);
> +	return err;
> +}
> +
> +static int port_stop(struct net_device *netdev)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err;
> +
> +	err = dpsw_if_disable(port_priv->ethsw_data->mc_io, 0,
> +			      port_priv->ethsw_data->dpsw_handle,
> +			      port_priv->idx);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_if_disable err %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static netdev_tx_t port_dropframe(struct sk_buff *skb,
> +				  struct net_device *netdev)
> +{
> +	/* we don't support I/O for now, drop the frame */
> +	dev_kfree_skb_any(skb);
> +
> +	return NETDEV_TX_OK;
> +}
> +
> +static const struct net_device_ops ethsw_port_ops = {
> +	.ndo_open		= port_open,
> +	.ndo_stop		= port_stop,
> +
> +	.ndo_set_mac_address	= eth_mac_addr,
> +	.ndo_change_mtu		= port_change_mtu,
> +	.ndo_has_offload_stats	= port_has_offload_stats,
> +	.ndo_get_offload_stats	= port_get_offload_stats,
> +
> +	.ndo_start_xmit		= port_dropframe,
> +};
> +
> +static void ethsw_links_state_update(struct ethsw_core *ethsw)
> +{
> +	int i;
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++)
> +		port_carrier_state_sync(ethsw->ports[i]->netdev);
> +}
> +
> +static irqreturn_t ethsw_irq0_handler(int irq_num, void *arg)
> +{
> +	return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t ethsw_irq0_handler_thread(int irq_num, void *arg)
> +{
> +	struct device *dev = (struct device *)arg;
> +	struct ethsw_core *ethsw = dev_get_drvdata(dev);
> +
> +	/* Mask the events and the if_id reserved bits to be cleared on read */
> +	u32 status = DPSW_IRQ_EVENT_LINK_CHANGED | 0xFFFF0000;
> +	int err;
> +
> +	err = dpsw_get_irq_status(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				  DPSW_IRQ_INDEX_IF, &status);
> +	if (err) {
> +		dev_err(dev, "Can't get irq status (err %d)", err);
> +
> +		err = dpsw_clear_irq_status(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +					    DPSW_IRQ_INDEX_IF, 0xFFFFFFFF);
> +		if (err)
> +			dev_err(dev, "Can't clear irq status (err %d)", err);
> +		goto out;
> +	}
> +
> +	if (status & DPSW_IRQ_EVENT_LINK_CHANGED)
> +		ethsw_links_state_update(ethsw);
> +
> +out:
> +	return IRQ_HANDLED;
> +}
> +
> +static int ethsw_setup_irqs(struct fsl_mc_device *sw_dev)
> +{
> +	struct device *dev = &sw_dev->dev;
> +	struct ethsw_core *ethsw = dev_get_drvdata(dev);
> +	u32 mask = DPSW_IRQ_EVENT_LINK_CHANGED;
> +	struct fsl_mc_device_irq *irq;
> +	int err;
> +
> +	err = fsl_mc_allocate_irqs(sw_dev);
> +	if (err) {
> +		dev_err(dev, "MC irqs allocation failed\n");
> +		return err;
> +	}
> +
> +	if (WARN_ON(sw_dev->obj_desc.irq_count != DPSW_IRQ_NUM)) {
> +		err = -EINVAL;
> +		goto free_irq;
> +	}
> +
> +	err = dpsw_set_irq_enable(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				  DPSW_IRQ_INDEX_IF, 0);
> +	if (err) {
> +		dev_err(dev, "dpsw_set_irq_enable err %d\n", err);
> +		goto free_irq;
> +	}
> +
> +	irq = sw_dev->irqs[DPSW_IRQ_INDEX_IF];
> +
> +	err = devm_request_threaded_irq(dev, irq->msi_desc->irq,
> +					ethsw_irq0_handler,
> +					ethsw_irq0_handler_thread,
> +					IRQF_NO_SUSPEND | IRQF_ONESHOT,
> +					dev_name(dev), dev);
> +	if (err) {
> +		dev_err(dev, "devm_request_threaded_irq(): %d", err);
> +		goto free_irq;
> +	}
> +
> +	err = dpsw_set_irq_mask(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				DPSW_IRQ_INDEX_IF, mask);
> +	if (err) {
> +		dev_err(dev, "dpsw_set_irq_mask(): %d", err);
> +		goto free_devm_irq;
> +	}
> +
> +	err = dpsw_set_irq_enable(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				  DPSW_IRQ_INDEX_IF, 1);
> +	if (err) {
> +		dev_err(dev, "dpsw_set_irq_enable(): %d", err);
> +		goto free_devm_irq;
> +	}
> +
> +	return 0;
> +
> +free_devm_irq:
> +	devm_free_irq(dev, irq->msi_desc->irq, dev);
> +free_irq:
> +	fsl_mc_free_irqs(sw_dev);
> +	return err;
> +}
> +
> +static void ethsw_teardown_irqs(struct fsl_mc_device *sw_dev)
> +{
> +	struct device *dev = &sw_dev->dev;
> +	struct ethsw_core *ethsw = dev_get_drvdata(dev);
> +	struct fsl_mc_device_irq *irq;
> +
> +	irq = sw_dev->irqs[DPSW_IRQ_INDEX_IF];
> +	dpsw_set_irq_enable(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +			    DPSW_IRQ_INDEX_IF, 0);

You can still print an error message here, in case something goes wrong.

> +	fsl_mc_free_irqs(sw_dev);
> +}
> +
> +static int swdev_port_attr_get(struct net_device *netdev,
> +			       struct switchdev_attr *attr)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +
> +	switch (attr->id) {
> +	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
> +		attr->u.ppid.id_len = 1;
> +		attr->u.ppid.id[0] = port_priv->ethsw_data->dev_id;
> +		break;
> +	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
> +		attr->u.brport_flags =
> +			(port_priv->ethsw_data->learning ? BR_LEARNING : 0) |
> +			(port_priv->flood ? BR_FLOOD : 0);
> +		break;
> +	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
> +		attr->u.brport_flags_support = BR_LEARNING | BR_FLOOD;
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return 0;
> +}
> +
> +static int port_attr_stp_state_set(struct net_device *netdev,
> +				   struct switchdev_trans *trans,
> +				   u8 state)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +
> +	if (switchdev_trans_ph_prepare(trans))
> +		return 0;
> +
> +	return ethsw_port_set_stp_state(port_priv, state);
> +}
> +
> +static int port_attr_br_flags_set(struct net_device *netdev,
> +				  struct switchdev_trans *trans,
> +				  unsigned long flags)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err = 0;
> +
> +	if (switchdev_trans_ph_prepare(trans))
> +		return 0;
> +
> +	/* Learning is enabled per switch */
> +	err = ethsw_set_learning(port_priv->ethsw_data, flags & BR_LEARNING);
> +	if (err)
> +		goto exit;
> +
> +	err = ethsw_port_set_flood(port_priv, flags & BR_FLOOD);
> +
> +exit:
> +	return err;
> +}
> +
> +static int swdev_port_attr_set(struct net_device *netdev,
> +			       const struct switchdev_attr *attr,
> +			       struct switchdev_trans *trans)
> +{
> +	int err = 0;
> +
> +	switch (attr->id) {
> +	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
> +		err = port_attr_stp_state_set(netdev, trans,
> +					      attr->u.stp_state);
> +		break;
> +	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
> +		err = port_attr_br_flags_set(netdev, trans,
> +					     attr->u.brport_flags);
> +		break;
> +	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
> +		/* VLANs are supported by default  */
> +		break;
> +	default:
> +		err = -EOPNOTSUPP;
> +		break;
> +	}
> +
> +	return err;
> +}
> +
> +static int port_vlans_add(struct net_device *netdev,
> +			  const struct switchdev_obj_port_vlan *vlan,
> +			  struct switchdev_trans *trans)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int vid, err;
> +
> +	if (switchdev_trans_ph_prepare(trans))
> +		return 0;
> +
> +	for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++) {
> +		if (!port_priv->ethsw_data->vlans[vid]) {
> +			/* this is a new VLAN */
> +			err = ethsw_add_vlan(port_priv->ethsw_data, vid);
> +			if (err)
> +				return err;
> +
> +			port_priv->ethsw_data->vlans[vid] |= ETHSW_VLAN_GLOBAL;
> +		}
> +		err = ethsw_port_add_vlan(port_priv, vid, vlan->flags);
> +		if (err)
> +			break;
> +	}
> +
> +	return err;
> +}
> +
> +static int port_lookup_address(struct net_device *netdev, int is_uc,
> +			       const unsigned char *addr)
> +{
> +	struct netdev_hw_addr_list *list = (is_uc) ? &netdev->uc : &netdev->mc;
> +	struct netdev_hw_addr *ha;
> +
> +	netif_addr_lock_bh(netdev);
> +	list_for_each_entry(ha, &list->list, list) {
> +		if (ether_addr_equal(ha->addr, addr)) {
> +			netif_addr_unlock_bh(netdev);
> +			return 1;
> +		}
> +	}
> +	netif_addr_unlock_bh(netdev);
> +	return 0;
> +}
> +
> +static int port_mdb_add(struct net_device *netdev,
> +			const struct switchdev_obj_port_mdb *mdb,
> +			struct switchdev_trans *trans)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err;
> +
> +	if (switchdev_trans_ph_prepare(trans))
> +		return 0;
> +
> +	/* Check if address is already set on this port */
> +	if (port_lookup_address(netdev, 0, mdb->addr))
> +		return -EEXIST;
> +
> +	err = ethsw_port_fdb_add_mc(port_priv, mdb->addr);
> +	if (err)
> +		return err;
> +
> +	err = dev_mc_add(netdev, mdb->addr);
> +	if (err)
> +		netdev_err(netdev, "dev_mc_add err %d\n", err);

In the error case, shouldn't there be a "ethsw_port_fdb_del_mc" ?

> +
> +	return err;
> +}
> +
> +static int swdev_port_obj_add(struct net_device *netdev,
> +			      const struct switchdev_obj *obj,
> +			      struct switchdev_trans *trans)
> +{
> +	int err;
> +
> +	switch (obj->id) {
> +	case SWITCHDEV_OBJ_ID_PORT_VLAN:
> +		err = port_vlans_add(netdev,
> +				     SWITCHDEV_OBJ_PORT_VLAN(obj),
> +				     trans);
> +		break;
> +	case SWITCHDEV_OBJ_ID_PORT_MDB:
> +		err = port_mdb_add(netdev,
> +				   SWITCHDEV_OBJ_PORT_MDB(obj),
> +				   trans);
> +		break;
> +	default:
> +		err = -EOPNOTSUPP;
> +		break;
> +	}
> +
> +	return err;
> +}
> +
> +static int ethsw_port_del_vlan(struct ethsw_port_priv *port_priv, u16 vid)
> +{
> +	struct ethsw_core *ethsw = port_priv->ethsw_data;
> +	struct net_device *netdev = port_priv->netdev;
> +	struct dpsw_vlan_if_cfg vcfg;
> +	int i, err, err2;
> +	bool is_oper;
> +
> +	if (!port_priv->vlans[vid])
> +		return -ENOENT;
> +
> +	if (port_priv->vlans[vid] & ETHSW_VLAN_PVID) {
> +		struct dpsw_tci_cfg tci_cfg = { 0 };
> +		/* Interface needs to be down to change PVID */
> +		is_oper = netif_oper_up(netdev);
> +
> +		if (is_oper) {
> +			err = dpsw_if_disable(ethsw->mc_io, 0,
> +					      ethsw->dpsw_handle,
> +					      port_priv->idx);
> +			if (err) {
> +				netdev_err(netdev, "dpsw_if_disable err %d\n",
> +					   err);
> +				goto exit_err;
> +			}
> +		}
> +
> +		err = dpsw_if_set_tci(ethsw->mc_io, 0,
> +				      ethsw->dpsw_handle,
> +				      port_priv->idx, &tci_cfg);
> +		if (!err) {
> +			port_priv->vlans[vid] &= ~ETHSW_VLAN_PVID;
> +			port_priv->pvid = 0;
> +		} else {
> +			netdev_err(netdev, "dpsw_if_set_tci err %d\n", err);
> +		}
> +
> +		if (is_oper) {
> +			err2 = dpsw_if_enable(ethsw->mc_io, 0,
> +					      ethsw->dpsw_handle,
> +					      port_priv->idx);
> +			if (err2) {
> +				netdev_err(netdev, "dpsw_if_enable err %d\n",
> +					   err2);
> +				return err2;
> +			}
> +		}
> +
> +		if (err)
> +			goto exit_err;
> +	}
> +
> +	vcfg.num_ifs = 1;
> +	vcfg.if_id[0] = port_priv->idx;
> +	if (port_priv->vlans[vid] & ETHSW_VLAN_UNTAGGED) {
> +		err = dpsw_vlan_remove_if_untagged(ethsw->mc_io, 0,
> +						   ethsw->dpsw_handle,
> +						   vid, &vcfg);
> +		if (err) {
> +			netdev_err(netdev,
> +				   "dpsw_vlan_remove_if_untagged err %d\n",
> +				   err);
> +		}
> +		port_priv->vlans[vid] &= ~ETHSW_VLAN_UNTAGGED;
> +	}
> +
> +	if (port_priv->vlans[vid] & ETHSW_VLAN_MEMBER) {
> +		err = dpsw_vlan_remove_if(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +					  vid, &vcfg);
> +		if (err) {
> +			netdev_err(netdev,
> +				   "dpsw_vlan_remove_if err %d\n", err);
> +			return err;
> +		}
> +		port_priv->vlans[vid] &= ~ETHSW_VLAN_MEMBER;
> +
> +		/* Delete VLAN from switch if it is no longer configured on
> +		 * any port
> +		 */
> +		for (i = 0; i < ethsw->sw_attr.num_ifs; i++)
> +			if (ethsw->ports[i]->vlans[vid] & ETHSW_VLAN_MEMBER)
> +				return 0; /* Found a port member in VID */
> +
> +		ethsw->vlans[vid] &= ~ETHSW_VLAN_GLOBAL;
> +
> +		err = ethsw_dellink_switch(ethsw, vid);
> +		if (err)
> +			goto exit_err;
> +	}
> +
> +	return 0;
> +exit_err:
> +	return err;
> +}
> +
> +static int port_vlans_del(struct net_device *netdev,
> +			  const struct switchdev_obj_port_vlan *vlan)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int vid, err;
> +
> +	for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++) {
> +		err = ethsw_port_del_vlan(port_priv, vid);
> +		if (err)
> +			break;
> +	}
> +
> +	return err;
> +}
> +
> +static int port_mdb_del(struct net_device *netdev,
> +			const struct switchdev_obj_port_mdb *mdb)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +	int err;
> +
> +	if (!port_lookup_address(netdev, 0, mdb->addr))
> +		return -ENOENT;
> +
> +	err = ethsw_port_fdb_del_mc(port_priv, mdb->addr);
> +	if (err)
> +		return err;
> +
> +	err = dev_mc_del(netdev, mdb->addr);
> +	if (err) {
> +		netdev_err(netdev, "dev_mc_del err %d\n", err);
> +		return err;
> +	}
> +
> +	return err;
> +}
> +
> +static int swdev_port_obj_del(struct net_device *netdev,
> +			      const struct switchdev_obj *obj)
> +{
> +	int err;
> +
> +	switch (obj->id) {
> +	case SWITCHDEV_OBJ_ID_PORT_VLAN:
> +		err = port_vlans_del(netdev, SWITCHDEV_OBJ_PORT_VLAN(obj));
> +		break;
> +	case SWITCHDEV_OBJ_ID_PORT_MDB:
> +		err = port_mdb_del(netdev, SWITCHDEV_OBJ_PORT_MDB(obj));
> +		break;
> +	default:
> +		err = -EOPNOTSUPP;
> +		break;
> +	}
> +	return err;
> +}
> +
> +static const struct switchdev_ops ethsw_port_switchdev_ops = {
> +	.switchdev_port_attr_get	= swdev_port_attr_get,
> +	.switchdev_port_attr_set	= swdev_port_attr_set,
> +	.switchdev_port_obj_add		= swdev_port_obj_add,
> +	.switchdev_port_obj_del		= swdev_port_obj_del,
> +};
> +
> +/* For the moment, only flood setting needs to be updated */
> +static int port_bridge_join(struct net_device *netdev)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +
> +	/* Enable flooding */
> +	return ethsw_port_set_flood(port_priv, 1);
> +}
> +
> +static int port_bridge_leave(struct net_device *netdev)
> +{
> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
> +
> +	/* Disable flooding */
> +	return ethsw_port_set_flood(port_priv, 0);
> +}
> +
> +static int port_netdevice_event(struct notifier_block *unused,
> +				unsigned long event, void *ptr)
> +{
> +	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
> +	struct netdev_notifier_changeupper_info *info = ptr;
> +	struct net_device *upper_dev;
> +	int err = 0;
> +
> +	if (netdev->netdev_ops != &ethsw_port_ops)
> +		return NOTIFY_DONE;
> +
> +	/* Handle just upper dev link/unlink for the moment */
> +	if (event == NETDEV_CHANGEUPPER) {
> +		upper_dev = info->upper_dev;
> +		if (netif_is_bridge_master(upper_dev)) {
> +			if (info->linking)
> +				err = port_bridge_join(netdev);
> +			else
> +				err = port_bridge_leave(netdev);
> +		}
> +	}
> +
> +	return notifier_from_errno(err);
> +}
> +
> +static struct notifier_block port_nb __read_mostly = {
> +	.notifier_call = port_netdevice_event,
> +};
> +
> +struct ethsw_switchdev_event_work {
> +	struct work_struct work;
> +	struct switchdev_notifier_fdb_info fdb_info;
> +	struct net_device *dev;
> +	unsigned long event;
> +};
> +
> +static void ethsw_switchdev_event_work(struct work_struct *work)
> +{
> +	struct ethsw_switchdev_event_work *switchdev_work =
> +		container_of(work, struct ethsw_switchdev_event_work, work);
> +	struct net_device *dev = switchdev_work->dev;
> +	struct switchdev_notifier_fdb_info *fdb_info;
> +	struct ethsw_port_priv *port_priv;
> +
> +	rtnl_lock();
> +	port_priv = netdev_priv(dev);
> +	fdb_info = &switchdev_work->fdb_info;
> +
> +	switch (switchdev_work->event) {
> +	case SWITCHDEV_FDB_ADD_TO_DEVICE:
> +		ethsw_port_fdb_add_uc(netdev_priv(dev), fdb_info->addr);
> +		break;
> +	case SWITCHDEV_FDB_DEL_TO_DEVICE:
> +		ethsw_port_fdb_del_uc(netdev_priv(dev), fdb_info->addr);
> +		break;
> +	}
> +
> +	rtnl_unlock();
> +	kfree(switchdev_work->fdb_info.addr);
> +	kfree(switchdev_work);
> +	dev_put(dev);
> +}
> +
> +/* Called under rcu_read_lock() */
> +static int port_switchdev_event(struct notifier_block *unused,
> +				unsigned long event, void *ptr)
> +{
> +	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
> +	struct ethsw_switchdev_event_work *switchdev_work;
> +	struct switchdev_notifier_fdb_info *fdb_info = ptr;
> +
> +	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
> +	if (!switchdev_work)
> +		return NOTIFY_BAD;
> +
> +	INIT_WORK(&switchdev_work->work, ethsw_switchdev_event_work);
> +	switchdev_work->dev = dev;
> +	switchdev_work->event = event;
> +
> +	switch (event) {
> +	case SWITCHDEV_FDB_ADD_TO_DEVICE:
> +	case SWITCHDEV_FDB_DEL_TO_DEVICE:
> +		memcpy(&switchdev_work->fdb_info, ptr,
> +		       sizeof(switchdev_work->fdb_info));
> +		switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
> +		if (!switchdev_work->fdb_info.addr)
> +			goto err_addr_alloc;
> +
> +		ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
> +				fdb_info->addr);
> +
> +		/* Take a reference on the device to avoid being freed. */
> +		dev_hold(dev);
> +		break;
> +	default:
> +		return NOTIFY_DONE;
> +	}
> +
> +	queue_work(ethsw_owq, &switchdev_work->work);
> +
> +	return NOTIFY_DONE;
> +
> +err_addr_alloc:
> +	kfree(switchdev_work);
> +	return NOTIFY_BAD;
> +}
> +
> +static struct notifier_block port_switchdev_nb = {
> +	.notifier_call = port_switchdev_event,
> +};
> +
> +static int ethsw_register_notifier(struct device *dev)
> +{
> +	int err;
> +
> +	err = register_netdevice_notifier(&port_nb);
> +	if (err) {
> +		dev_err(dev, "Failed to register netdev notifier\n");
> +		return err;
> +	}
> +
> +	err = register_switchdev_notifier(&port_switchdev_nb);
> +	if (err) {
> +		dev_err(dev, "Failed to register switchdev notifier\n");
> +		goto err_switchdev_nb;
> +	}
> +
> +	return 0;
> +
> +err_switchdev_nb:
> +	unregister_netdevice_notifier(&port_nb);
> +	return err;
> +}
> +
> +static int ethsw_open(struct ethsw_core	*ethsw)

Minor formatting error, tab in function signature - see following function as well.

> +{
> +	struct ethsw_port_priv *port_priv = NULL;
> +	int i, err;
> +
> +	err = dpsw_enable(ethsw->mc_io, 0, ethsw->dpsw_handle);
> +	if (err) {
> +		dev_err(ethsw->dev, "dpsw_enable err %d\n", err);
> +		return err;
> +	}
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		port_priv = ethsw->ports[i];
> +		err = dev_open(port_priv->netdev);
> +		if (err) {
> +			netdev_err(port_priv->netdev, "dev_open err %d\n", err);
> +			return err;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int ethsw_stop(struct ethsw_core	*ethsw)
> +{
> +	struct ethsw_port_priv *port_priv = NULL;
> +	int i, err;
> +
> +	destroy_workqueue(ethsw_owq);

If workqueue is destroyed here, shouldn't it be alloc'd in ethsw_open?

> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		port_priv = ethsw->ports[i];
> +		dev_close(port_priv->netdev);
> +	}
> +
> +	err = dpsw_disable(ethsw->mc_io, 0, ethsw->dpsw_handle);
> +	if (err) {
> +		dev_err(ethsw->dev, "dpsw_disable err %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ethsw_init(struct fsl_mc_device *sw_dev)
> +{
> +	struct device *dev = &sw_dev->dev;
> +	struct ethsw_core *ethsw = dev_get_drvdata(dev);
> +	u16 version_major, version_minor, i;
> +	struct dpsw_stp_cfg stp_cfg;
> +	int err;
> +
> +	ethsw->dev_id = sw_dev->obj_desc.id;
> +
> +	err = dpsw_open(ethsw->mc_io, 0, ethsw->dev_id, &ethsw->dpsw_handle);
> +	if (err) {
> +		dev_err(dev, "dpsw_open err %d\n", err);
> +		return err;
> +	}
> +
> +	err = dpsw_get_attributes(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				  &ethsw->sw_attr);
> +	if (err) {
> +		dev_err(dev, "dpsw_get_attributes err %d\n", err);
> +		goto err_close;
> +	}
> +
> +	err = dpsw_get_api_version(ethsw->mc_io, 0,
> +				   &version_major,
> +				   &version_minor);
> +	if (err) {
> +		dev_err(dev, "dpsw_get_api_version err %d\n", err);
> +		goto err_close;
> +	}
> +
> +	/* Minimum supported DPSW version check */
> +	if (version_major < DPSW_MIN_VER_MAJOR ||
> +	    (version_major == DPSW_MIN_VER_MAJOR &&
> +	     version_minor < DPSW_MIN_VER_MINOR)) {
> +		dev_err(dev, "DPSW version %d:%d not supported. Use %d.%d or
> greater.\n",
> +			version_major,
> +			version_minor,
> +			DPSW_MIN_VER_MAJOR, DPSW_MIN_VER_MINOR);
> +		err = -ENOTSUPP;
> +		goto err_close;
> +	}
> +
> +	err = dpsw_reset(ethsw->mc_io, 0, ethsw->dpsw_handle);
> +	if (err) {
> +		dev_err(dev, "dpsw_reset err %d\n", err);
> +		goto err_close;
> +	}
> +
> +	err = dpsw_fdb_set_learning_mode(ethsw->mc_io, 0, ethsw->dpsw_handle, 0,
> +					 DPSW_FDB_LEARNING_MODE_HW);
> +	if (err) {
> +		dev_err(dev, "dpsw_fdb_set_learning_mode err %d\n", err);
> +		goto err_close;
> +	}
> +
> +	stp_cfg.vlan_id = DEFAULT_VLAN_ID;
> +	stp_cfg.state = DPSW_STP_STATE_FORWARDING;
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		err = dpsw_if_set_stp(ethsw->mc_io, 0, ethsw->dpsw_handle, i,
> +				      &stp_cfg);
> +		if (err) {
> +			dev_err(dev, "dpsw_if_set_stp err %d for port %d\n",
> +				err, i);
> +			goto err_close;
> +		}
> +
> +		err = dpsw_if_set_broadcast(ethsw->mc_io, 0,
> +					    ethsw->dpsw_handle, i, 1);
> +		if (err) {
> +			dev_err(dev,
> +				"dpsw_if_set_broadcast err %d for port %d\n",
> +				err, i);
> +			goto err_close;
> +		}
> +	}
> +
> +	ethsw_owq = alloc_ordered_workqueue("%s_ordered", WQ_MEM_RECLAIM,
> +					    "ethsw");
> +	if (!ethsw_owq) {
> +		err = -ENOMEM;
> +		goto err_close;
> +	}
> +
> +	err = ethsw_register_notifier(dev);
> +	if (err)
> +		goto err_destroy_ordered_workqueue;
> +
> +	return 0;
> +
> +err_destroy_ordered_workqueue:
> +	destroy_workqueue(ethsw_owq);
> +
> +err_close:
> +	dpsw_close(ethsw->mc_io, 0, ethsw->dpsw_handle);
> +	return err;
> +}
> +
> +static int ethsw_port_init(struct ethsw_port_priv *port_priv, u16 port)
> +{
> +	const char def_mcast[ETH_ALEN] = {0x01, 0x00, 0x5e, 0x00, 0x00, 0x01};
> +	struct net_device *netdev = port_priv->netdev;
> +	struct ethsw_core *ethsw = port_priv->ethsw_data;
> +	struct dpsw_tci_cfg tci_cfg = {0};
> +	struct dpsw_vlan_if_cfg vcfg;
> +	int err;
> +
> +	/* Switch starts with all ports configured to VLAN 1. Need to
> +	 * remove this setting to allow configuration at bridge join
> +	 */
> +	vcfg.num_ifs = 1;
> +	vcfg.if_id[0] = port_priv->idx;
> +
> +	err = dpsw_vlan_remove_if_untagged(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +					   DEFAULT_VLAN_ID, &vcfg);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_vlan_remove_if_untagged err %d\n",
> +			   err);
> +		return err;
> +	}
> +
> +	err = dpsw_if_set_tci(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +			      port_priv->idx, &tci_cfg);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_if_set_tci err %d\n", err);
> +		return err;
> +	}
> +
> +	err = dpsw_vlan_remove_if(ethsw->mc_io, 0, ethsw->dpsw_handle,
> +				  DEFAULT_VLAN_ID, &vcfg);
> +	if (err) {
> +		netdev_err(netdev, "dpsw_vlan_remove_if err %d\n", err);
> +		return err;
> +	}
> +
> +	err = ethsw_port_fdb_add_mc(port_priv, def_mcast);
> +
> +	return err;
> +}
> +
> +static void ethsw_takedown(struct fsl_mc_device *sw_dev)
> +{
> +	struct device *dev = &sw_dev->dev;
> +	struct ethsw_core *ethsw = dev_get_drvdata(dev);
> +	int err;
> +
> +	err = unregister_switchdev_notifier(&port_switchdev_nb);
> +	if (err)
> +		dev_err(dev,
> +			"Failed to unregister switchdev notifier (%d)\n", err);
> +
> +	err = unregister_netdevice_notifier(&port_nb);
> +	if (err)
> +		dev_err(dev,
> +			"Failed to unregister netdev notifier (%d)\n", err);

Above 2 can be grouped into ethsw_unregister_notifier.

> +
> +	err = dpsw_close(ethsw->mc_io, 0, ethsw->dpsw_handle);
> +	if (err)
> +		dev_warn(dev, "dpsw_close err %d\n", err);
> +}
> +
> +static int ethsw_remove(struct fsl_mc_device *sw_dev)
> +{
> +	struct ethsw_port_priv *port_priv;
> +	struct ethsw_core *ethsw;
> +	struct device *dev;
> +	int i;
> +
> +	dev = &sw_dev->dev;
> +	ethsw = dev_get_drvdata(dev);
> +
> +	ethsw_teardown_irqs(sw_dev);
> +
> +	rtnl_lock();
> +	ethsw_stop(ethsw);
> +	rtnl_unlock();
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		port_priv = ethsw->ports[i];
> +		unregister_netdev(port_priv->netdev);
> +		free_netdev(port_priv->netdev);
> +	}
> +	kfree(ethsw->ports);
> +
> +	ethsw_takedown(sw_dev);
> +	fsl_mc_portal_free(ethsw->mc_io);
> +
> +	kfree(ethsw);
> +
> +	dev_set_drvdata(dev, NULL);
> +
> +	return 0;
> +}
> +
> +static int ethsw_probe_port(struct ethsw_core *ethsw, u16 port_idx)
> +{
> +	struct ethsw_port_priv *port_priv;
> +	struct device *dev = ethsw->dev;
> +	struct net_device *port_netdev;
> +	int err;
> +
> +	port_netdev = alloc_etherdev(sizeof(struct ethsw_port_priv));
> +	if (!port_netdev) {
> +		dev_err(dev, "alloc_etherdev error\n");
> +		return -ENOMEM;
> +	}
> +
> +	port_priv = netdev_priv(port_netdev);
> +	port_priv->netdev = port_netdev;
> +	port_priv->ethsw_data = ethsw;
> +
> +	port_priv->idx = port_idx;
> +	port_priv->stp_state = BR_STATE_FORWARDING;
> +
> +	/* Flooding is implicitly enabled */
> +	port_priv->flood = true;
> +
> +	SET_NETDEV_DEV(port_netdev, dev);
> +	port_netdev->netdev_ops = &ethsw_port_ops;
> +	port_netdev->switchdev_ops = &ethsw_port_switchdev_ops;
> +
> +	/* Set MTU limits */
> +	port_netdev->min_mtu = ETH_MIN_MTU;
> +	port_netdev->max_mtu = ETHSW_MAX_FRAME_LENGTH;
> +
> +	err = register_netdev(port_netdev);
> +	if (err < 0) {
> +		dev_err(dev, "register_netdev error %d\n", err);
> +			free_netdev(port_netdev);
> +			return err;
> +		}
> +
> +	ethsw->ports[port_idx] = port_priv;
> +
> +	return ethsw_port_init(port_priv, port_idx);
> +}
> +
> +static int ethsw_probe(struct fsl_mc_device *sw_dev)
> +{
> +	struct device *dev = &sw_dev->dev;
> +	struct ethsw_core *ethsw;
> +	int err;
> +	u16 i, j;
> +
> +	/* Allocate switch core*/
> +	ethsw = kzalloc(sizeof(*ethsw), GFP_KERNEL);
> +
> +	if (!ethsw)
> +		return -ENOMEM;
> +
> +	ethsw->dev = dev;
> +	dev_set_drvdata(dev, ethsw);
> +
> +	err = fsl_mc_portal_allocate(sw_dev, 0, &ethsw->mc_io);
> +	if (err) {
> +		dev_err(dev, "fsl_mc_portal_allocate err %d\n", err);
> +		goto err_free_drvdata;
> +	}
> +
> +	err = ethsw_init(sw_dev);
> +	if (err)
> +		goto err_free_cmdport;
> +
> +	/* DEFAULT_VLAN_ID is implicitly configured on the switch */
> +	ethsw->vlans[DEFAULT_VLAN_ID] = ETHSW_VLAN_MEMBER;
> +
> +	/* Learning is implicitly enabled */
> +	ethsw->learning = true;
> +
> +	ethsw->ports = kcalloc(ethsw->sw_attr.num_ifs, sizeof(*ethsw->ports),
> +			       GFP_KERNEL);
> +	if (!(ethsw->ports)) {
> +		err = -ENOMEM;
> +		goto err_takedown;
> +	}
> +
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		err = ethsw_probe_port(ethsw, i);
> +		if (err) {
> +			/* Cleanup previous ports only */
> +			for (j = 0; j < i; j++) {

I think you can go with
for (i--; i >= 0; i--)

or better yet:
goto err_free_ports
and refactor err_free_ports to look like:
for (i--; i >= 0; i--) {
...
}

Best regards,
Bogdan P.

> +				unregister_netdev(ethsw->ports[j]->netdev);
> +				free_netdev(ethsw->ports[j]->netdev);
> +			}
> +			goto err_takedown;
> +		}
> +	}
> +
> +	/* Switch starts up enabled */
> +	rtnl_lock();
> +	err = ethsw_open(ethsw);
> +	rtnl_unlock();
> +	if (err)
> +		goto err_free_ports;
> +
> +	/* Setup IRQs */
> +	err = ethsw_setup_irqs(sw_dev);
> +	if (err)
> +		goto err_stop;
> +
> +	dev_info(dev, "probed %d port switch\n", ethsw->sw_attr.num_ifs);
> +	return 0;
> +
> +err_stop:
> +	rtnl_lock();
> +	ethsw_stop(ethsw);
> +	rtnl_unlock();
> +
> +err_free_ports:
> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++) {
> +		unregister_netdev(ethsw->ports[i]->netdev);
> +		free_netdev(ethsw->ports[i]->netdev);
> +	}
> +	kfree(ethsw->ports);
> +
> +err_takedown:
> +	ethsw_takedown(sw_dev);
> +
> +err_free_cmdport:
> +	fsl_mc_portal_free(ethsw->mc_io);
> +
> +err_free_drvdata:
> +	kfree(ethsw);
> +	dev_set_drvdata(dev, NULL);
> +
> +	return err;
> +}
> +
> +static const struct fsl_mc_device_id ethsw_match_id_table[] = {
> +	{
> +		.vendor = FSL_MC_VENDOR_FREESCALE,
> +		.obj_type = "dpsw",
> +	},
> +	{ .vendor = 0x0 }
> +};
> +MODULE_DEVICE_TABLE(fslmc, ethsw_match_id_table);
> +
> +static struct fsl_mc_driver eth_sw_drv = {
> +	.driver = {
> +		.name = KBUILD_MODNAME,
> +		.owner = THIS_MODULE,
> +	},
> +	.probe = ethsw_probe,
> +	.remove = ethsw_remove,
> +	.match_id_table = ethsw_match_id_table
> +};
> +
> +module_fsl_mc_driver(eth_sw_drv);
> +
> +MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_DESCRIPTION("DPAA2 Ethernet Switch Driver");
> diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.h b/drivers/staging/fsl-
> dpaa2/ethsw/ethsw.h
> new file mode 100644
> index 0000000..8c1d645
> --- /dev/null
> +++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.h
> @@ -0,0 +1,88 @@
> +/* Copyright 2014-2017 Freescale Semiconductor Inc.
> + * Copyright 2017 NXP
> + *
> + * 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.
> + *     * Neither the name of the above-listed copyright holders nor the
> + *	 names of any 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") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * 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 HOLDERS 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.
> + */
> +
> +#ifndef __ETHSW_H
> +#define __ETHSW_H
> +
> +#include <linux/netdevice.h>
> +#include <linux/etherdevice.h>
> +#include <linux/rtnetlink.h>
> +#include <linux/if_vlan.h>
> +#include <uapi/linux/if_bridge.h>
> +#include <net/switchdev.h>
> +#include <linux/if_bridge.h>
> +
> +#include "dpsw.h"
> +
> +/* Number of IRQs supported */
> +#define DPSW_IRQ_NUM	2
> +
> +#define ETHSW_VLAN_MEMBER	1
> +#define ETHSW_VLAN_UNTAGGED	2
> +#define ETHSW_VLAN_PVID		4
> +#define ETHSW_VLAN_GLOBAL	8
> +
> +/* Maximum Frame Length supported by HW (currently 10k) */
> +#define DPAA2_MFL		(10 * 1024)
> +#define ETHSW_MAX_FRAME_LENGTH	(DPAA2_MFL - VLAN_ETH_HLEN - ETH_FCS_LEN)
> +#define ETHSW_L2_MAX_FRM(mtu)	((mtu) + VLAN_ETH_HLEN + ETH_FCS_LEN)
> +
> +struct ethsw_core;
> +
> +/* Per port private data */
> +struct ethsw_port_priv {
> +	struct net_device	*netdev;
> +	u16			idx;
> +	struct ethsw_core	*ethsw_data;
> +	u8			link_state;
> +	u8			stp_state;
> +	bool			flood;
> +
> +	u8			vlans[VLAN_VID_MASK + 1];
> +	u16			pvid;
> +};
> +
> +/* Switch data */
> +struct ethsw_core {
> +	struct device			*dev;
> +	struct fsl_mc_io		*mc_io;
> +	u16				dpsw_handle;
> +	struct dpsw_attr		sw_attr;
> +	int				dev_id;
> +	struct ethsw_port_priv		**ports;
> +
> +	u8				vlans[VLAN_VID_MASK + 1];
> +	bool				learning;
> +};
> +
> +#endif	/* __ETHSW_H */
> --
> 1.9.1

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