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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-10 09:16:42 +07:00
56f36acd21
The configurable priority to traffic class mapping and the user specified queue ranges are used to configure the traffic class, overriding the hardware defaults when the 'hw' option is set to 0. However, when the 'hw' option is non-zero, the hardware QOS defaults are used. This patch makes it so that we can pass the data the user provided to ndo_setup_tc. This allows us to pull in the queue configuration if the user requested it as well as any additional hardware offload type requested by using a value other than 1 for the hw value. Finally it also provides a means for the device driver to return the level supported for the offload type via the qopt->hw value. Previously we were just always assuming the value to be 1, in the future values beyond just 1 may be supported. Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
441 lines
11 KiB
C
441 lines
11 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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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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struct mqprio_sched {
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struct Qdisc **qdiscs;
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int hw_offload;
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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_destroy(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 = { 0 };
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struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
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{ .mqprio = &offload } };
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dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
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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 int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
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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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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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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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/* 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)));
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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 = *qopt;
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struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
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{ .mqprio = &offload } };
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err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
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if (err)
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return err;
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priv->hw_offload = offload.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_destroy(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 - netdev_get_num_tc(dev);
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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)
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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 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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unsigned char *b = 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 i;
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sch->q.qlen = 0;
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memset(&sch->bstats, 0, sizeof(sch->bstats));
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memset(&sch->qstats, 0, sizeof(sch->qstats));
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for (i = 0; i < dev->num_tx_queues; i++) {
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qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
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spin_lock_bh(qdisc_lock(qdisc));
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sch->q.qlen += qdisc->q.qlen;
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sch->bstats.bytes += qdisc->bstats.bytes;
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sch->bstats.packets += qdisc->bstats.packets;
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sch->qstats.backlog += qdisc->qstats.backlog;
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sch->qstats.drops += qdisc->qstats.drops;
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sch->qstats.requeues += qdisc->qstats.requeues;
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sch->qstats.overlimits += qdisc->qstats.overlimits;
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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 (i = 0; i < netdev_get_num_tc(dev); i++) {
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opt.count[i] = dev->tc_to_txq[i].count;
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opt.offset[i] = dev->tc_to_txq[i].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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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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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_get(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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if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
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return 0;
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return ntx;
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}
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static void mqprio_put(struct Qdisc *sch, unsigned long cl)
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{
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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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struct net_device *dev = qdisc_dev(sch);
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if (cl <= netdev_get_num_tc(dev)) {
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tcm->tcm_parent = TC_H_ROOT;
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tcm->tcm_info = 0;
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} else {
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int i;
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struct netdev_queue *dev_queue;
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dev_queue = mqprio_queue_get(sch, cl);
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tcm->tcm_parent = 0;
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for (i = 0; i < netdev_get_num_tc(dev); i++) {
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struct netdev_tc_txq tc = dev->tc_to_txq[i];
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int q_idx = cl - netdev_get_num_tc(dev);
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if (q_idx > tc.offset &&
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q_idx <= tc.offset + tc.count) {
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tcm->tcm_parent =
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TC_H_MAKE(TC_H_MAJ(sch->handle),
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TC_H_MIN(i + 1));
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break;
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}
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}
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tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
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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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struct net_device *dev = qdisc_dev(sch);
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if (cl <= netdev_get_num_tc(dev)) {
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int i;
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__u32 qlen = 0;
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struct Qdisc *qdisc;
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struct gnet_stats_queue qstats = {0};
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struct gnet_stats_basic_packed bstats = {0};
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struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
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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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qdisc = rtnl_dereference(q->qdisc);
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spin_lock_bh(qdisc_lock(qdisc));
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qlen += qdisc->q.qlen;
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bstats.bytes += qdisc->bstats.bytes;
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bstats.packets += qdisc->bstats.packets;
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qstats.backlog += qdisc->qstats.backlog;
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qstats.drops += qdisc->qstats.drops;
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qstats.requeues += qdisc->qstats.requeues;
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qstats.overlimits += qdisc->qstats.overlimits;
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spin_unlock_bh(qdisc_lock(qdisc));
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}
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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(NULL, d, NULL, &bstats) < 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 {
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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(qdisc_root_sleeping_running(sch),
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d, NULL, &sch->bstats) < 0 ||
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gnet_stats_copy_queue(d, NULL,
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&sch->qstats, sch->q.qlen) < 0)
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return -1;
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}
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return 0;
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}
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static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
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{
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struct net_device *dev = qdisc_dev(sch);
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unsigned long ntx;
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if (arg->stop)
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return;
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/* Walk hierarchy with a virtual class per tc */
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arg->count = arg->skip;
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for (ntx = arg->skip;
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ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
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ntx++) {
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if (arg->fn(sch, ntx + 1, arg) < 0) {
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arg->stop = 1;
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break;
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}
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arg->count++;
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}
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}
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static const struct Qdisc_class_ops mqprio_class_ops = {
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.graft = mqprio_graft,
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.leaf = mqprio_leaf,
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.get = mqprio_get,
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.put = mqprio_put,
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.walk = mqprio_walk,
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.dump = mqprio_dump_class,
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.dump_stats = mqprio_dump_class_stats,
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};
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static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
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.cl_ops = &mqprio_class_ops,
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.id = "mqprio",
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.priv_size = sizeof(struct mqprio_sched),
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.init = mqprio_init,
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.destroy = mqprio_destroy,
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.attach = mqprio_attach,
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.dump = mqprio_dump,
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.owner = THIS_MODULE,
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};
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static int __init mqprio_module_init(void)
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{
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return register_qdisc(&mqprio_qdisc_ops);
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}
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static void __exit mqprio_module_exit(void)
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{
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unregister_qdisc(&mqprio_qdisc_ops);
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}
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module_init(mqprio_module_init);
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module_exit(mqprio_module_exit);
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MODULE_LICENSE("GPL");
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