forked from mirrors/linux
a655fe9f19
An ipvlan bug fix in 'net' conflicted with the abstraction away of the IPV6 specific support in 'net-next'. Similarly, a bug fix for mlx5 in 'net' conflicted with the flow action conversion in 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
304 lines
7.7 KiB
C
304 lines
7.7 KiB
C
/*
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* Handling of a master device, switching frames via its switch fabric CPU port
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*
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* Copyright (c) 2017 Savoir-faire Linux Inc.
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* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include "dsa_priv.h"
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static void dsa_master_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats,
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uint64_t *data)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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int port = cpu_dp->index;
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int count = 0;
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if (ops->get_sset_count && ops->get_ethtool_stats) {
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count = ops->get_sset_count(dev, ETH_SS_STATS);
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ops->get_ethtool_stats(dev, stats, data);
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}
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if (ds->ops->get_ethtool_stats)
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ds->ops->get_ethtool_stats(ds, port, data + count);
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}
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static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
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struct ethtool_stats *stats,
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uint64_t *data)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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int port = cpu_dp->index;
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int count = 0;
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if (dev->phydev && !ops->get_ethtool_phy_stats) {
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count = phy_ethtool_get_sset_count(dev->phydev);
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if (count >= 0)
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phy_ethtool_get_stats(dev->phydev, stats, data);
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} else if (ops->get_sset_count && ops->get_ethtool_phy_stats) {
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count = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
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ops->get_ethtool_phy_stats(dev, stats, data);
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}
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if (count < 0)
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count = 0;
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if (ds->ops->get_ethtool_phy_stats)
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ds->ops->get_ethtool_phy_stats(ds, port, data + count);
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}
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static int dsa_master_get_sset_count(struct net_device *dev, int sset)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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int count = 0;
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if (sset == ETH_SS_PHY_STATS && dev->phydev &&
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!ops->get_ethtool_phy_stats)
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count = phy_ethtool_get_sset_count(dev->phydev);
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else if (ops->get_sset_count)
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count = ops->get_sset_count(dev, sset);
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if (count < 0)
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count = 0;
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if (ds->ops->get_sset_count)
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count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);
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return count;
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}
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static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
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uint8_t *data)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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int port = cpu_dp->index;
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int len = ETH_GSTRING_LEN;
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int mcount = 0, count;
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unsigned int i;
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uint8_t pfx[4];
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uint8_t *ndata;
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snprintf(pfx, sizeof(pfx), "p%.2d", port);
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/* We do not want to be NULL-terminated, since this is a prefix */
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pfx[sizeof(pfx) - 1] = '_';
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if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
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!ops->get_ethtool_phy_stats) {
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mcount = phy_ethtool_get_sset_count(dev->phydev);
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if (mcount < 0)
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mcount = 0;
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else
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phy_ethtool_get_strings(dev->phydev, data);
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} else if (ops->get_sset_count && ops->get_strings) {
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mcount = ops->get_sset_count(dev, stringset);
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if (mcount < 0)
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mcount = 0;
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ops->get_strings(dev, stringset, data);
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}
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if (ds->ops->get_strings) {
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ndata = data + mcount * len;
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/* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
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* the output after to prepend our CPU port prefix we
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* constructed earlier
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*/
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ds->ops->get_strings(ds, port, stringset, ndata);
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count = ds->ops->get_sset_count(ds, port, stringset);
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for (i = 0; i < count; i++) {
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memmove(ndata + (i * len + sizeof(pfx)),
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ndata + i * len, len - sizeof(pfx));
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memcpy(ndata + i * len, pfx, sizeof(pfx));
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}
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}
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}
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static int dsa_master_get_phys_port_name(struct net_device *dev,
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char *name, size_t len)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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if (snprintf(name, len, "p%d", cpu_dp->index) >= len)
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return -EINVAL;
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return 0;
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}
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static int dsa_master_ethtool_setup(struct net_device *dev)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct dsa_switch *ds = cpu_dp->ds;
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struct ethtool_ops *ops;
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ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
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if (!ops)
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return -ENOMEM;
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cpu_dp->orig_ethtool_ops = dev->ethtool_ops;
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if (cpu_dp->orig_ethtool_ops)
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memcpy(ops, cpu_dp->orig_ethtool_ops, sizeof(*ops));
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ops->get_sset_count = dsa_master_get_sset_count;
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ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
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ops->get_strings = dsa_master_get_strings;
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ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;
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dev->ethtool_ops = ops;
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return 0;
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}
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static void dsa_master_ethtool_teardown(struct net_device *dev)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
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cpu_dp->orig_ethtool_ops = NULL;
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}
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static int dsa_master_ndo_setup(struct net_device *dev)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct dsa_switch *ds = cpu_dp->ds;
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struct net_device_ops *ops;
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if (dev->netdev_ops->ndo_get_phys_port_name)
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return 0;
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ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
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if (!ops)
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return -ENOMEM;
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cpu_dp->orig_ndo_ops = dev->netdev_ops;
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if (cpu_dp->orig_ndo_ops)
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memcpy(ops, cpu_dp->orig_ndo_ops, sizeof(*ops));
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ops->ndo_get_phys_port_name = dsa_master_get_phys_port_name;
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dev->netdev_ops = ops;
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return 0;
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}
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static void dsa_master_ndo_teardown(struct net_device *dev)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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dev->netdev_ops = cpu_dp->orig_ndo_ops;
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cpu_dp->orig_ndo_ops = NULL;
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}
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static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *dev = to_net_dev(d);
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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return sprintf(buf, "%s\n",
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dsa_tag_protocol_to_str(cpu_dp->tag_ops));
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}
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static DEVICE_ATTR_RO(tagging);
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static struct attribute *dsa_slave_attrs[] = {
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&dev_attr_tagging.attr,
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NULL
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};
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static const struct attribute_group dsa_group = {
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.name = "dsa",
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.attrs = dsa_slave_attrs,
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};
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static void dsa_master_set_mtu(struct net_device *dev, struct dsa_port *cpu_dp)
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{
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unsigned int mtu = ETH_DATA_LEN + cpu_dp->tag_ops->overhead;
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int err;
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rtnl_lock();
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if (mtu <= dev->max_mtu) {
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err = dev_set_mtu(dev, mtu);
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if (err)
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netdev_dbg(dev, "Unable to set MTU to include for DSA overheads\n");
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}
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rtnl_unlock();
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}
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static void dsa_master_reset_mtu(struct net_device *dev)
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{
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int err;
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rtnl_lock();
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err = dev_set_mtu(dev, ETH_DATA_LEN);
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if (err)
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netdev_dbg(dev,
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"Unable to reset MTU to exclude DSA overheads\n");
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rtnl_unlock();
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}
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static struct lock_class_key dsa_master_addr_list_lock_key;
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int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
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{
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int ret;
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dsa_master_set_mtu(dev, cpu_dp);
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/* If we use a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point on get
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* sent to the tag format's receive function.
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*/
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wmb();
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dev->dsa_ptr = cpu_dp;
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lockdep_set_class(&dev->addr_list_lock,
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&dsa_master_addr_list_lock_key);
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ret = dsa_master_ethtool_setup(dev);
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if (ret)
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return ret;
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ret = dsa_master_ndo_setup(dev);
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if (ret)
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goto out_err_ethtool_teardown;
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ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
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if (ret)
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goto out_err_ndo_teardown;
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return ret;
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out_err_ndo_teardown:
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dsa_master_ndo_teardown(dev);
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out_err_ethtool_teardown:
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dsa_master_ethtool_teardown(dev);
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return ret;
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}
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void dsa_master_teardown(struct net_device *dev)
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{
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sysfs_remove_group(&dev->dev.kobj, &dsa_group);
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dsa_master_ndo_teardown(dev);
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dsa_master_ethtool_teardown(dev);
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dsa_master_reset_mtu(dev);
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dev->dsa_ptr = NULL;
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/* If we used a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point get sent
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* without the tag and go through the regular receive path.
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*/
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wmb();
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}
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