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a76053707d
Most users of ndo_do_ioctl are ethernet drivers that implement the MII commands SIOCGMIIPHY/SIOCGMIIREG/SIOCSMIIREG, or hardware timestamping with SIOCSHWTSTAMP/SIOCGHWTSTAMP. Separate these from the few drivers that use ndo_do_ioctl to implement SIOCBOND, SIOCBR and SIOCWANDEV commands. This is a purely cosmetic change intended to help readers find their way through the implementation. Cc: Doug Ledford <dledford@redhat.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jay Vosburgh <j.vosburgh@gmail.com> Cc: Veaceslav Falico <vfalico@gmail.com> Cc: Andy Gospodarek <andy@greyhouse.net> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Vivien Didelot <vivien.didelot@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Vladimir Oltean <olteanv@gmail.com> Cc: Leon Romanovsky <leon@kernel.org> Cc: linux-rdma@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
419 lines
11 KiB
C
419 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include "dsa_priv.h"
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static int dsa_master_get_regs_len(struct net_device *dev)
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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 ret = 0;
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int len;
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if (ops->get_regs_len) {
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len = ops->get_regs_len(dev);
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if (len < 0)
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return len;
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ret += len;
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}
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ret += sizeof(struct ethtool_drvinfo);
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ret += sizeof(struct ethtool_regs);
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if (ds->ops->get_regs_len) {
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len = ds->ops->get_regs_len(ds, port);
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if (len < 0)
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return len;
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ret += len;
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}
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return ret;
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}
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static void dsa_master_get_regs(struct net_device *dev,
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struct ethtool_regs *regs, void *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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struct ethtool_drvinfo *cpu_info;
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struct ethtool_regs *cpu_regs;
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int port = cpu_dp->index;
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int len;
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if (ops->get_regs_len && ops->get_regs) {
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len = ops->get_regs_len(dev);
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if (len < 0)
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return;
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regs->len = len;
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ops->get_regs(dev, regs, data);
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data += regs->len;
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}
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cpu_info = (struct ethtool_drvinfo *)data;
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strlcpy(cpu_info->driver, "dsa", sizeof(cpu_info->driver));
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data += sizeof(*cpu_info);
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cpu_regs = (struct ethtool_regs *)data;
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data += sizeof(*cpu_regs);
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if (ds->ops->get_regs_len && ds->ops->get_regs) {
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len = ds->ops->get_regs_len(ds, port);
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if (len < 0)
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return;
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cpu_regs->len = len;
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ds->ops->get_regs(ds, port, cpu_regs, data);
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}
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}
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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, 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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if (count < 0)
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return;
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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_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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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 dsa_switch_tree *dst;
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int err = -EOPNOTSUPP;
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struct dsa_port *dp;
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dst = ds->dst;
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switch (cmd) {
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case SIOCGHWTSTAMP:
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case SIOCSHWTSTAMP:
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/* Deny PTP operations on master if there is at least one
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* switch in the tree that is PTP capable.
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*/
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list_for_each_entry(dp, &dst->ports, list)
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if (dp->ds->ops->port_hwtstamp_get ||
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dp->ds->ops->port_hwtstamp_set)
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return -EBUSY;
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break;
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}
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if (dev->netdev_ops->ndo_eth_ioctl)
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err = dev->netdev_ops->ndo_eth_ioctl(dev, ifr, cmd);
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return err;
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}
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static const struct dsa_netdevice_ops dsa_netdev_ops = {
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.ndo_eth_ioctl = dsa_master_ioctl,
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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_regs_len = dsa_master_get_regs_len;
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ops->get_regs = dsa_master_get_regs;
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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 void dsa_netdev_ops_set(struct net_device *dev,
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const struct dsa_netdevice_ops *ops)
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{
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dev->dsa_ptr->netdev_ops = ops;
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}
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static void dsa_master_set_promiscuity(struct net_device *dev, int inc)
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{
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const struct dsa_device_ops *ops = dev->dsa_ptr->tag_ops;
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if (!ops->promisc_on_master)
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return;
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rtnl_lock();
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dev_set_promiscuity(dev, inc);
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rtnl_unlock();
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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 ssize_t tagging_store(struct device *d, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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const struct dsa_device_ops *new_tag_ops, *old_tag_ops;
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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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int err;
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old_tag_ops = cpu_dp->tag_ops;
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new_tag_ops = dsa_find_tagger_by_name(buf);
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/* Bad tagger name, or module is not loaded? */
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if (IS_ERR(new_tag_ops))
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return PTR_ERR(new_tag_ops);
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if (new_tag_ops == old_tag_ops)
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/* Drop the temporarily held duplicate reference, since
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* the DSA switch tree uses this tagger.
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*/
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goto out;
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err = dsa_tree_change_tag_proto(cpu_dp->ds->dst, dev, new_tag_ops,
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old_tag_ops);
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if (err) {
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/* On failure the old tagger is restored, so we don't need the
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* driver for the new one.
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*/
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dsa_tag_driver_put(new_tag_ops);
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return err;
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}
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/* On success we no longer need the module for the old tagging protocol
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*/
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out:
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dsa_tag_driver_put(old_tag_ops);
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return count;
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}
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static DEVICE_ATTR_RW(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_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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const struct dsa_device_ops *tag_ops = cpu_dp->tag_ops;
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struct dsa_switch *ds = cpu_dp->ds;
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struct device_link *consumer_link;
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int mtu, ret;
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mtu = ETH_DATA_LEN + dsa_tag_protocol_overhead(tag_ops);
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/* The DSA master must use SET_NETDEV_DEV for this to work. */
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consumer_link = device_link_add(ds->dev, dev->dev.parent,
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DL_FLAG_AUTOREMOVE_CONSUMER);
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if (!consumer_link)
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netdev_err(dev,
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"Failed to create a device link to DSA switch %s\n",
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dev_name(ds->dev));
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rtnl_lock();
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ret = dev_set_mtu(dev, mtu);
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rtnl_unlock();
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if (ret)
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netdev_warn(dev, "error %d setting MTU to %d to include DSA overhead\n",
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ret, mtu);
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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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dsa_master_set_promiscuity(dev, 1);
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ret = dsa_master_ethtool_setup(dev);
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if (ret)
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goto out_err_reset_promisc;
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dsa_netdev_ops_set(dev, &dsa_netdev_ops);
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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_netdev_ops_set(dev, NULL);
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dsa_master_ethtool_teardown(dev);
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out_err_reset_promisc:
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dsa_master_set_promiscuity(dev, -1);
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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_netdev_ops_set(dev, NULL);
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dsa_master_ethtool_teardown(dev);
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dsa_master_reset_mtu(dev);
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dsa_master_set_promiscuity(dev, -1);
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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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