144 lines
3.9 KiB
C
144 lines
3.9 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 && 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 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 (ops && ops->get_sset_count)
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count += ops->get_sset_count(dev, sset);
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if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
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count += ds->ops->get_sset_count(ds);
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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 (ops && ops->get_sset_count && ops->get_strings) {
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mcount = ops->get_sset_count(dev, ETH_SS_STATS);
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ops->get_strings(dev, stringset, data);
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}
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if (stringset == ETH_SS_STATS && 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, ndata);
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count = ds->ops->get_sset_count(ds);
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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_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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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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int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
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{
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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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return dsa_master_ethtool_setup(dev);
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}
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void dsa_master_teardown(struct net_device *dev)
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{
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dsa_master_ethtool_teardown(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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