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6ca80638b9
Use more inclusive terms throughout the DSA subsystem by moving away from "master" which is replaced by "conduit" and "slave" which is replaced by "user". No functional changes. Acked-by: Rob Herring <robh@kernel.org> Acked-by: Stephen Hemminger <stephen@networkplumber.org> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://lore.kernel.org/r/20231023181729.1191071-2-florian.fainelli@broadcom.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
476 lines
12 KiB
C
476 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Handling of a conduit 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 <linux/ethtool.h>
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#include <linux/netdevice.h>
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#include <linux/netlink.h>
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#include <net/dsa.h>
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#include "conduit.h"
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#include "dsa.h"
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#include "port.h"
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#include "tag.h"
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static int dsa_conduit_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_conduit_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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strscpy(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_conduit_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_conduit_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_conduit_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_conduit_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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/* Deny PTP operations on conduit if there is at least one switch in the tree
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* that is PTP capable.
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*/
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int __dsa_conduit_hwtstamp_validate(struct net_device *dev,
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const struct kernel_hwtstamp_config *config,
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struct netlink_ext_ack *extack)
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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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struct dsa_port *dp;
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dst = ds->dst;
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list_for_each_entry(dp, &dst->ports, list) {
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if (dsa_port_supports_hwtstamp(dp)) {
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NL_SET_ERR_MSG(extack,
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"HW timestamping not allowed on DSA conduit when switch supports the operation");
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return -EBUSY;
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}
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}
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return 0;
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}
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static int dsa_conduit_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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if (netif_is_lag_master(dev))
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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_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_conduit_get_regs_len;
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ops->get_regs = dsa_conduit_get_regs;
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ops->get_sset_count = dsa_conduit_get_sset_count;
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ops->get_ethtool_stats = dsa_conduit_get_ethtool_stats;
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ops->get_strings = dsa_conduit_get_strings;
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ops->get_ethtool_phy_stats = dsa_conduit_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_conduit_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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if (netif_is_lag_master(dev))
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return;
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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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/* Keep the conduit always promiscuous if the tagging protocol requires that
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* (garbles MAC DA) or if it doesn't support unicast filtering, case in which
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* it would revert to promiscuous mode as soon as we call dev_uc_add() on it
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* anyway.
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*/
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static void dsa_conduit_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 ((dev->priv_flags & IFF_UNICAST_FLT) && !ops->promisc_on_conduit)
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return;
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ASSERT_RTNL();
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dev_set_promiscuity(dev, inc);
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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 sysfs_emit(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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const char *end = strchrnul(buf, '\n'), *name;
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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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size_t len = end - buf;
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int err;
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/* Empty string passed */
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if (!len)
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return -ENOPROTOOPT;
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name = kstrndup(buf, len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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old_tag_ops = cpu_dp->tag_ops;
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new_tag_ops = dsa_tag_driver_get_by_name(name);
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kfree(name);
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/* Bad tagger name? */
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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, 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_user_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_user_attrs,
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};
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static void dsa_conduit_reset_mtu(struct net_device *dev)
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{
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int err;
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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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}
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int dsa_conduit_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 conduit must use SET_NETDEV_DEV for this to work. */
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if (!netif_is_lag_master(dev)) {
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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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}
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/* The switch driver may not implement ->port_change_mtu(), case in
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* which dsa_user_change_mtu() will not update the conduit MTU either,
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* so we need to do that here.
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*/
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ret = dev_set_mtu(dev, mtu);
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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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dsa_conduit_set_promiscuity(dev, 1);
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ret = dsa_conduit_ethtool_setup(dev);
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if (ret)
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goto out_err_reset_promisc;
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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_ethtool_teardown;
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return ret;
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out_err_ethtool_teardown:
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dsa_conduit_ethtool_teardown(dev);
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out_err_reset_promisc:
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dsa_conduit_set_promiscuity(dev, -1);
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return ret;
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}
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void dsa_conduit_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_conduit_ethtool_teardown(dev);
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dsa_conduit_reset_mtu(dev);
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dsa_conduit_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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int dsa_conduit_lag_setup(struct net_device *lag_dev, struct dsa_port *cpu_dp,
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struct netdev_lag_upper_info *uinfo,
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struct netlink_ext_ack *extack)
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{
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bool conduit_setup = false;
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int err;
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if (!netdev_uses_dsa(lag_dev)) {
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err = dsa_conduit_setup(lag_dev, cpu_dp);
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if (err)
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return err;
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conduit_setup = true;
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}
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err = dsa_port_lag_join(cpu_dp, lag_dev, uinfo, extack);
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if (err) {
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NL_SET_ERR_MSG_WEAK_MOD(extack, "CPU port failed to join LAG");
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goto out_conduit_teardown;
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}
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return 0;
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out_conduit_teardown:
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if (conduit_setup)
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dsa_conduit_teardown(lag_dev);
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return err;
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}
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/* Tear down a conduit if there isn't any other user port on it,
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* optionally also destroying LAG information.
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*/
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void dsa_conduit_lag_teardown(struct net_device *lag_dev,
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struct dsa_port *cpu_dp)
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{
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struct net_device *upper;
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struct list_head *iter;
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dsa_port_lag_leave(cpu_dp, lag_dev);
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netdev_for_each_upper_dev_rcu(lag_dev, upper, iter)
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if (dsa_user_dev_check(upper))
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return;
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dsa_conduit_teardown(lag_dev);
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}
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