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![Ahmed S. Darwish](/assets/img/avatar_default.png)
The Qdisc::running sequence counter has two uses: 1. Reliably reading qdisc's tc statistics while the qdisc is running (a seqcount read/retry loop at gnet_stats_add_basic()). 2. As a flag, indicating whether the qdisc in question is running (without any retry loops). For the first usage, the Qdisc::running sequence counter write section, qdisc_run_begin() => qdisc_run_end(), covers a much wider area than what is actually needed: the raw qdisc's bstats update. A u64_stats sync point was thus introduced (in previous commits) inside the bstats structure itself. A local u64_stats write section is then started and stopped for the bstats updates. Use that u64_stats sync point mechanism for the bstats read/retry loop at gnet_stats_add_basic(). For the second qdisc->running usage, a __QDISC_STATE_RUNNING bit flag, accessed with atomic bitops, is sufficient. Using a bit flag instead of a sequence counter at qdisc_run_begin/end() and qdisc_is_running() leads to the SMP barriers implicitly added through raw_read_seqcount() and write_seqcount_begin/end() getting removed. All call sites have been surveyed though, and no required ordering was identified. Now that the qdisc->running sequence counter is no longer used, remove it. Note, using u64_stats implies no sequence counter protection for 64-bit architectures. This can lead to the qdisc tc statistics "packets" vs. "bytes" values getting out of sync on rare occasions. The individual values will still be valid. Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
625 lines
16 KiB
C
625 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* net/sched/sch_mqprio.c
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*
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* Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/sch_generic.h>
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#include <net/pkt_cls.h>
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struct mqprio_sched {
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struct Qdisc **qdiscs;
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u16 mode;
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u16 shaper;
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int hw_offload;
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u32 flags;
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u64 min_rate[TC_QOPT_MAX_QUEUE];
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u64 max_rate[TC_QOPT_MAX_QUEUE];
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};
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static void mqprio_destroy(struct Qdisc *sch)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct mqprio_sched *priv = qdisc_priv(sch);
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unsigned int ntx;
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if (priv->qdiscs) {
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for (ntx = 0;
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ntx < dev->num_tx_queues && priv->qdiscs[ntx];
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ntx++)
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qdisc_put(priv->qdiscs[ntx]);
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kfree(priv->qdiscs);
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}
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if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
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struct tc_mqprio_qopt_offload mqprio = { { 0 } };
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switch (priv->mode) {
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case TC_MQPRIO_MODE_DCB:
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case TC_MQPRIO_MODE_CHANNEL:
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dev->netdev_ops->ndo_setup_tc(dev,
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TC_SETUP_QDISC_MQPRIO,
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&mqprio);
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break;
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default:
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return;
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}
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} else {
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netdev_set_num_tc(dev, 0);
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}
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}
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static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
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{
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int i, j;
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/* Verify num_tc is not out of max range */
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if (qopt->num_tc > TC_MAX_QUEUE)
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return -EINVAL;
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/* Verify priority mapping uses valid tcs */
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for (i = 0; i < TC_BITMASK + 1; i++) {
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if (qopt->prio_tc_map[i] >= qopt->num_tc)
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return -EINVAL;
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}
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/* Limit qopt->hw to maximum supported offload value. Drivers have
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* the option of overriding this later if they don't support the a
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* given offload type.
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*/
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if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
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qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
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/* If hardware offload is requested we will leave it to the device
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* to either populate the queue counts itself or to validate the
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* provided queue counts. If ndo_setup_tc is not present then
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* hardware doesn't support offload and we should return an error.
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*/
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if (qopt->hw)
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return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
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for (i = 0; i < qopt->num_tc; i++) {
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unsigned int last = qopt->offset[i] + qopt->count[i];
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/* Verify the queue count is in tx range being equal to the
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* real_num_tx_queues indicates the last queue is in use.
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*/
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if (qopt->offset[i] >= dev->real_num_tx_queues ||
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!qopt->count[i] ||
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last > dev->real_num_tx_queues)
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return -EINVAL;
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/* Verify that the offset and counts do not overlap */
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for (j = i + 1; j < qopt->num_tc; j++) {
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if (last > qopt->offset[j])
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return -EINVAL;
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}
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}
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return 0;
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}
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static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
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[TCA_MQPRIO_MODE] = { .len = sizeof(u16) },
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[TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) },
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[TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
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[TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
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};
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static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
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const struct nla_policy *policy, int len)
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{
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int nested_len = nla_len(nla) - NLA_ALIGN(len);
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if (nested_len >= nla_attr_size(0))
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return nla_parse_deprecated(tb, maxtype,
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nla_data(nla) + NLA_ALIGN(len),
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nested_len, policy, NULL);
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memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
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return 0;
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}
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static int mqprio_init(struct Qdisc *sch, struct nlattr *opt,
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struct netlink_ext_ack *extack)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct mqprio_sched *priv = qdisc_priv(sch);
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struct netdev_queue *dev_queue;
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struct Qdisc *qdisc;
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int i, err = -EOPNOTSUPP;
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struct tc_mqprio_qopt *qopt = NULL;
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struct nlattr *tb[TCA_MQPRIO_MAX + 1];
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struct nlattr *attr;
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int rem;
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int len;
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BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
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BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
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if (sch->parent != TC_H_ROOT)
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return -EOPNOTSUPP;
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if (!netif_is_multiqueue(dev))
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return -EOPNOTSUPP;
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/* make certain can allocate enough classids to handle queues */
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if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
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return -ENOMEM;
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if (!opt || nla_len(opt) < sizeof(*qopt))
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return -EINVAL;
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qopt = nla_data(opt);
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if (mqprio_parse_opt(dev, qopt))
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return -EINVAL;
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len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
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if (len > 0) {
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err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy,
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sizeof(*qopt));
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if (err < 0)
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return err;
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if (!qopt->hw)
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return -EINVAL;
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if (tb[TCA_MQPRIO_MODE]) {
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priv->flags |= TC_MQPRIO_F_MODE;
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priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]);
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}
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if (tb[TCA_MQPRIO_SHAPER]) {
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priv->flags |= TC_MQPRIO_F_SHAPER;
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priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]);
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}
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if (tb[TCA_MQPRIO_MIN_RATE64]) {
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if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
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return -EINVAL;
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i = 0;
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nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
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rem) {
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if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64)
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return -EINVAL;
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if (i >= qopt->num_tc)
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break;
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priv->min_rate[i] = *(u64 *)nla_data(attr);
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i++;
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}
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priv->flags |= TC_MQPRIO_F_MIN_RATE;
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}
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if (tb[TCA_MQPRIO_MAX_RATE64]) {
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if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
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return -EINVAL;
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i = 0;
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nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
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rem) {
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if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64)
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return -EINVAL;
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if (i >= qopt->num_tc)
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break;
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priv->max_rate[i] = *(u64 *)nla_data(attr);
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i++;
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}
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priv->flags |= TC_MQPRIO_F_MAX_RATE;
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}
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}
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/* pre-allocate qdisc, attachment can't fail */
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priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
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GFP_KERNEL);
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if (!priv->qdiscs)
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return -ENOMEM;
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for (i = 0; i < dev->num_tx_queues; i++) {
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dev_queue = netdev_get_tx_queue(dev, i);
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qdisc = qdisc_create_dflt(dev_queue,
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get_default_qdisc_ops(dev, i),
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TC_H_MAKE(TC_H_MAJ(sch->handle),
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TC_H_MIN(i + 1)), extack);
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if (!qdisc)
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return -ENOMEM;
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priv->qdiscs[i] = qdisc;
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qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
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}
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/* If the mqprio options indicate that hardware should own
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* the queue mapping then run ndo_setup_tc otherwise use the
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* supplied and verified mapping
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*/
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if (qopt->hw) {
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struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt};
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switch (priv->mode) {
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case TC_MQPRIO_MODE_DCB:
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if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
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return -EINVAL;
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break;
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case TC_MQPRIO_MODE_CHANNEL:
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mqprio.flags = priv->flags;
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if (priv->flags & TC_MQPRIO_F_MODE)
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mqprio.mode = priv->mode;
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if (priv->flags & TC_MQPRIO_F_SHAPER)
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mqprio.shaper = priv->shaper;
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if (priv->flags & TC_MQPRIO_F_MIN_RATE)
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for (i = 0; i < mqprio.qopt.num_tc; i++)
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mqprio.min_rate[i] = priv->min_rate[i];
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if (priv->flags & TC_MQPRIO_F_MAX_RATE)
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for (i = 0; i < mqprio.qopt.num_tc; i++)
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mqprio.max_rate[i] = priv->max_rate[i];
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break;
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default:
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return -EINVAL;
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}
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err = dev->netdev_ops->ndo_setup_tc(dev,
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TC_SETUP_QDISC_MQPRIO,
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&mqprio);
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if (err)
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return err;
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priv->hw_offload = mqprio.qopt.hw;
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} else {
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netdev_set_num_tc(dev, qopt->num_tc);
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for (i = 0; i < qopt->num_tc; i++)
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netdev_set_tc_queue(dev, i,
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qopt->count[i], qopt->offset[i]);
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}
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/* Always use supplied priority mappings */
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for (i = 0; i < TC_BITMASK + 1; i++)
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netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
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sch->flags |= TCQ_F_MQROOT;
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return 0;
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}
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static void mqprio_attach(struct Qdisc *sch)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct mqprio_sched *priv = qdisc_priv(sch);
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struct Qdisc *qdisc, *old;
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unsigned int ntx;
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/* Attach underlying qdisc */
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for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
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qdisc = priv->qdiscs[ntx];
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old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
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if (old)
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qdisc_put(old);
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if (ntx < dev->real_num_tx_queues)
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qdisc_hash_add(qdisc, false);
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}
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kfree(priv->qdiscs);
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priv->qdiscs = NULL;
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}
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static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
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unsigned long cl)
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{
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struct net_device *dev = qdisc_dev(sch);
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unsigned long ntx = cl - 1;
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if (ntx >= dev->num_tx_queues)
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return NULL;
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return netdev_get_tx_queue(dev, ntx);
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}
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static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
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struct Qdisc **old, struct netlink_ext_ack *extack)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
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if (!dev_queue)
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return -EINVAL;
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if (dev->flags & IFF_UP)
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dev_deactivate(dev);
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*old = dev_graft_qdisc(dev_queue, new);
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if (new)
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new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
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if (dev->flags & IFF_UP)
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dev_activate(dev);
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return 0;
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}
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static int dump_rates(struct mqprio_sched *priv,
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struct tc_mqprio_qopt *opt, struct sk_buff *skb)
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{
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struct nlattr *nest;
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int i;
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if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
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nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MIN_RATE64);
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if (!nest)
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goto nla_put_failure;
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for (i = 0; i < opt->num_tc; i++) {
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if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
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sizeof(priv->min_rate[i]),
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&priv->min_rate[i]))
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goto nla_put_failure;
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}
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nla_nest_end(skb, nest);
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}
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if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
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nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MAX_RATE64);
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if (!nest)
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goto nla_put_failure;
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for (i = 0; i < opt->num_tc; i++) {
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if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
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sizeof(priv->max_rate[i]),
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&priv->max_rate[i]))
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goto nla_put_failure;
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}
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nla_nest_end(skb, nest);
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}
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return 0;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return -1;
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}
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static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct mqprio_sched *priv = qdisc_priv(sch);
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struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
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struct tc_mqprio_qopt opt = { 0 };
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struct Qdisc *qdisc;
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unsigned int ntx, tc;
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sch->q.qlen = 0;
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gnet_stats_basic_sync_init(&sch->bstats);
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memset(&sch->qstats, 0, sizeof(sch->qstats));
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/* MQ supports lockless qdiscs. However, statistics accounting needs
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* to account for all, none, or a mix of locked and unlocked child
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* qdiscs. Percpu stats are added to counters in-band and locking
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* qdisc totals are added at end.
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*/
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for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
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qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
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spin_lock_bh(qdisc_lock(qdisc));
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gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats,
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&qdisc->bstats, false);
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gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats,
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&qdisc->qstats);
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sch->q.qlen += qdisc_qlen(qdisc);
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spin_unlock_bh(qdisc_lock(qdisc));
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}
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opt.num_tc = netdev_get_num_tc(dev);
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memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
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opt.hw = priv->hw_offload;
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for (tc = 0; tc < netdev_get_num_tc(dev); tc++) {
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opt.count[tc] = dev->tc_to_txq[tc].count;
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opt.offset[tc] = dev->tc_to_txq[tc].offset;
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}
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if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
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goto nla_put_failure;
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if ((priv->flags & TC_MQPRIO_F_MODE) &&
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nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
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goto nla_put_failure;
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if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
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nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
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goto nla_put_failure;
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if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
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priv->flags & TC_MQPRIO_F_MAX_RATE) &&
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(dump_rates(priv, &opt, skb) != 0))
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goto nla_put_failure;
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return nla_nest_end(skb, nla);
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nla_put_failure:
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nlmsg_trim(skb, nla);
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return -1;
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}
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static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
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{
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struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
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if (!dev_queue)
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return NULL;
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return dev_queue->qdisc_sleeping;
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}
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static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
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{
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struct net_device *dev = qdisc_dev(sch);
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unsigned int ntx = TC_H_MIN(classid);
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/* There are essentially two regions here that have valid classid
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* values. The first region will have a classid value of 1 through
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* num_tx_queues. All of these are backed by actual Qdiscs.
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*/
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if (ntx < TC_H_MIN_PRIORITY)
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return (ntx <= dev->num_tx_queues) ? ntx : 0;
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/* The second region represents the hardware traffic classes. These
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* are represented by classid values of TC_H_MIN_PRIORITY through
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* TC_H_MIN_PRIORITY + netdev_get_num_tc - 1
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*/
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return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
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}
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static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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if (cl < TC_H_MIN_PRIORITY) {
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struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
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struct net_device *dev = qdisc_dev(sch);
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int tc = netdev_txq_to_tc(dev, cl - 1);
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tcm->tcm_parent = (tc < 0) ? 0 :
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TC_H_MAKE(TC_H_MAJ(sch->handle),
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TC_H_MIN(tc + TC_H_MIN_PRIORITY));
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tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
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} else {
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tcm->tcm_parent = TC_H_ROOT;
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tcm->tcm_info = 0;
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}
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tcm->tcm_handle |= TC_H_MIN(cl);
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return 0;
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}
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static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
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struct gnet_dump *d)
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__releases(d->lock)
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__acquires(d->lock)
|
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{
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if (cl >= TC_H_MIN_PRIORITY) {
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int i;
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__u32 qlen;
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struct gnet_stats_queue qstats = {0};
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struct gnet_stats_basic_sync bstats;
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struct net_device *dev = qdisc_dev(sch);
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struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
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gnet_stats_basic_sync_init(&bstats);
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/* Drop lock here it will be reclaimed before touching
|
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* statistics this is required because the d->lock we
|
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* hold here is the look on dev_queue->qdisc_sleeping
|
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* also acquired below.
|
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*/
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if (d->lock)
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spin_unlock_bh(d->lock);
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for (i = tc.offset; i < tc.offset + tc.count; i++) {
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struct netdev_queue *q = netdev_get_tx_queue(dev, i);
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struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
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spin_lock_bh(qdisc_lock(qdisc));
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gnet_stats_add_basic(&bstats, qdisc->cpu_bstats,
|
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&qdisc->bstats, false);
|
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gnet_stats_add_queue(&qstats, qdisc->cpu_qstats,
|
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&qdisc->qstats);
|
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sch->q.qlen += qdisc_qlen(qdisc);
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spin_unlock_bh(qdisc_lock(qdisc));
|
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}
|
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qlen = qdisc_qlen(sch) + qstats.qlen;
|
|
|
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/* Reclaim root sleeping lock before completing stats */
|
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if (d->lock)
|
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spin_lock_bh(d->lock);
|
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if (gnet_stats_copy_basic(d, NULL, &bstats, false) < 0 ||
|
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gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
|
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return -1;
|
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} else {
|
|
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
|
|
|
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sch = dev_queue->qdisc_sleeping;
|
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if (gnet_stats_copy_basic(d, sch->cpu_bstats,
|
|
&sch->bstats, true) < 0 ||
|
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qdisc_qstats_copy(d, sch) < 0)
|
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return -1;
|
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}
|
|
return 0;
|
|
}
|
|
|
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static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
{
|
|
struct net_device *dev = qdisc_dev(sch);
|
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unsigned long ntx;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
/* Walk hierarchy with a virtual class per tc */
|
|
arg->count = arg->skip;
|
|
for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
|
|
if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
|
|
/* Pad the values and skip over unused traffic classes */
|
|
if (ntx < TC_MAX_QUEUE) {
|
|
arg->count = TC_MAX_QUEUE;
|
|
ntx = TC_MAX_QUEUE;
|
|
}
|
|
|
|
/* Reset offset, sort out remaining per-queue qdiscs */
|
|
for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
|
|
if (arg->fn(sch, ntx + 1, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
|
|
struct tcmsg *tcm)
|
|
{
|
|
return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
|
|
}
|
|
|
|
static const struct Qdisc_class_ops mqprio_class_ops = {
|
|
.graft = mqprio_graft,
|
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.leaf = mqprio_leaf,
|
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.find = mqprio_find,
|
|
.walk = mqprio_walk,
|
|
.dump = mqprio_dump_class,
|
|
.dump_stats = mqprio_dump_class_stats,
|
|
.select_queue = mqprio_select_queue,
|
|
};
|
|
|
|
static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
|
|
.cl_ops = &mqprio_class_ops,
|
|
.id = "mqprio",
|
|
.priv_size = sizeof(struct mqprio_sched),
|
|
.init = mqprio_init,
|
|
.destroy = mqprio_destroy,
|
|
.attach = mqprio_attach,
|
|
.change_real_num_tx = mq_change_real_num_tx,
|
|
.dump = mqprio_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init mqprio_module_init(void)
|
|
{
|
|
return register_qdisc(&mqprio_qdisc_ops);
|
|
}
|
|
|
|
static void __exit mqprio_module_exit(void)
|
|
{
|
|
unregister_qdisc(&mqprio_qdisc_ops);
|
|
}
|
|
|
|
module_init(mqprio_module_init);
|
|
module_exit(mqprio_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|