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Date: Thu, 5 Mar 2020 09:16:40 +0200
From: Ido Schimmel <idosch@...sch.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, jiri@...lanox.com,
petrm@...lanox.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 1/5] net: sched: Make FIFO Qdisc offloadable
From: Petr Machata <petrm@...lanox.com>
Invoke ndo_setup_tc() as appropriate to signal init / replacement,
destroying and dumping of pFIFO / bFIFO Qdisc.
A lot of the FIFO logic is used for pFIFO_head_drop as well, but that's a
semantically very different Qdisc that isn't really in the same boat as
pFIFO / bFIFO. Split some of the functions to keep the Qdisc intact.
Signed-off-by: Petr Machata <petrm@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
include/linux/netdevice.h | 1 +
include/net/pkt_cls.h | 15 ++++++
net/sched/sch_fifo.c | 97 ++++++++++++++++++++++++++++++++++++---
3 files changed, 107 insertions(+), 6 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b6fedd54cd8e..654808bfad83 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -853,6 +853,7 @@ enum tc_setup_type {
TC_SETUP_FT,
TC_SETUP_QDISC_ETS,
TC_SETUP_QDISC_TBF,
+ TC_SETUP_QDISC_FIFO,
};
/* These structures hold the attributes of bpf state that are being passed
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 53946b509b51..341a66af8d59 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -881,4 +881,19 @@ struct tc_tbf_qopt_offload {
};
};
+enum tc_fifo_command {
+ TC_FIFO_REPLACE,
+ TC_FIFO_DESTROY,
+ TC_FIFO_STATS,
+};
+
+struct tc_fifo_qopt_offload {
+ enum tc_fifo_command command;
+ u32 handle;
+ u32 parent;
+ union {
+ struct tc_qopt_offload_stats stats;
+ };
+};
+
#endif
diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 37c8aa75d70c..a579a4131d22 100644
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -12,6 +12,7 @@
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
/* 1 band FIFO pseudo-"scheduler" */
@@ -51,8 +52,49 @@ static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch,
return NET_XMIT_CN;
}
-static int fifo_init(struct Qdisc *sch, struct nlattr *opt,
- struct netlink_ext_ack *extack)
+static void fifo_offload_init(struct Qdisc *sch)
+{
+ struct net_device *dev = qdisc_dev(sch);
+ struct tc_fifo_qopt_offload qopt;
+
+ if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
+ return;
+
+ qopt.command = TC_FIFO_REPLACE;
+ qopt.handle = sch->handle;
+ qopt.parent = sch->parent;
+ dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_FIFO, &qopt);
+}
+
+static void fifo_offload_destroy(struct Qdisc *sch)
+{
+ struct net_device *dev = qdisc_dev(sch);
+ struct tc_fifo_qopt_offload qopt;
+
+ if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
+ return;
+
+ qopt.command = TC_FIFO_DESTROY;
+ qopt.handle = sch->handle;
+ qopt.parent = sch->parent;
+ dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_FIFO, &qopt);
+}
+
+static int fifo_offload_dump(struct Qdisc *sch)
+{
+ struct tc_fifo_qopt_offload qopt;
+
+ qopt.command = TC_FIFO_STATS;
+ qopt.handle = sch->handle;
+ qopt.parent = sch->parent;
+ qopt.stats.bstats = &sch->bstats;
+ qopt.stats.qstats = &sch->qstats;
+
+ return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_FIFO, &qopt);
+}
+
+static int __fifo_init(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
{
bool bypass;
bool is_bfifo = sch->ops == &bfifo_qdisc_ops;
@@ -82,10 +124,35 @@ static int fifo_init(struct Qdisc *sch, struct nlattr *opt,
sch->flags |= TCQ_F_CAN_BYPASS;
else
sch->flags &= ~TCQ_F_CAN_BYPASS;
+
return 0;
}
-static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
+static int fifo_init(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ err = __fifo_init(sch, opt, extack);
+ if (err)
+ return err;
+
+ fifo_offload_init(sch);
+ return 0;
+}
+
+static int fifo_hd_init(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ return __fifo_init(sch, opt, extack);
+}
+
+static void fifo_destroy(struct Qdisc *sch)
+{
+ fifo_offload_destroy(sch);
+}
+
+static int __fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct tc_fifo_qopt opt = { .limit = sch->limit };
@@ -97,6 +164,22 @@ static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
return -1;
}
+static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ int err;
+
+ err = fifo_offload_dump(sch);
+ if (err)
+ return err;
+
+ return __fifo_dump(sch, skb);
+}
+
+static int fifo_hd_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ return __fifo_dump(sch, skb);
+}
+
struct Qdisc_ops pfifo_qdisc_ops __read_mostly = {
.id = "pfifo",
.priv_size = 0,
@@ -104,6 +187,7 @@ struct Qdisc_ops pfifo_qdisc_ops __read_mostly = {
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.init = fifo_init,
+ .destroy = fifo_destroy,
.reset = qdisc_reset_queue,
.change = fifo_init,
.dump = fifo_dump,
@@ -118,6 +202,7 @@ struct Qdisc_ops bfifo_qdisc_ops __read_mostly = {
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.init = fifo_init,
+ .destroy = fifo_destroy,
.reset = qdisc_reset_queue,
.change = fifo_init,
.dump = fifo_dump,
@@ -131,10 +216,10 @@ struct Qdisc_ops pfifo_head_drop_qdisc_ops __read_mostly = {
.enqueue = pfifo_tail_enqueue,
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
- .init = fifo_init,
+ .init = fifo_hd_init,
.reset = qdisc_reset_queue,
- .change = fifo_init,
- .dump = fifo_dump,
+ .change = fifo_hd_init,
+ .dump = fifo_hd_dump,
.owner = THIS_MODULE,
};
--
2.24.1
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