From ec97ecf1ebe485a17cd8395a5f35e6b80b57665a Mon Sep 17 00:00:00 2001 From: "Mohit P. Tahiliani" Date: Wed, 22 Jan 2020 23:52:33 +0530 Subject: net: sched: add Flow Queue PIE packet scheduler Principles: - Packets are classified on flows. - This is a Stochastic model (as we use a hash, several flows might be hashed to the same slot) - Each flow has a PIE managed queue. - Flows are linked onto two (Round Robin) lists, so that new flows have priority on old ones. - For a given flow, packets are not reordered. - Drops during enqueue only. - ECN capability is off by default. - ECN threshold (if ECN is enabled) is at 10% by default. - Uses timestamps to calculate queue delay by default. Usage: tc qdisc ... fq_pie [ limit PACKETS ] [ flows NUMBER ] [ target TIME ] [ tupdate TIME ] [ alpha NUMBER ] [ beta NUMBER ] [ quantum BYTES ] [ memory_limit BYTES ] [ ecnprob PERCENTAGE ] [ [no]ecn ] [ [no]bytemode ] [ [no_]dq_rate_estimator ] defaults: limit: 10240 packets, flows: 1024 target: 15 ms, tupdate: 15 ms (in jiffies) alpha: 1/8, beta : 5/4 quantum: device MTU, memory_limit: 32 Mb ecnprob: 10%, ecn: off bytemode: off, dq_rate_estimator: off Signed-off-by: Mohit P. Tahiliani Signed-off-by: Sachin D. Patil Signed-off-by: V. Saicharan Signed-off-by: Mohit Bhasi Signed-off-by: Leslie Monis Signed-off-by: Gautam Ramakrishnan Signed-off-by: David S. Miller --- include/net/pie.h | 2 ++ include/uapi/linux/pkt_sched.h | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) (limited to 'include') diff --git a/include/net/pie.h b/include/net/pie.h index 90f5db3d29e7..fd5a37cb7993 100644 --- a/include/net/pie.h +++ b/include/net/pie.h @@ -81,9 +81,11 @@ struct pie_stats { /** * struct pie_skb_cb - contains private skb vars * @enqueue_time: timestamp when the packet is enqueued + * @mem_usage: size of the skb during enqueue */ struct pie_skb_cb { psched_time_t enqueue_time; + u32 mem_usage; }; static inline void pie_params_init(struct pie_params *params) diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h index bf5a5b1dfb0b..bbe791b24168 100644 --- a/include/uapi/linux/pkt_sched.h +++ b/include/uapi/linux/pkt_sched.h @@ -971,6 +971,37 @@ struct tc_pie_xstats { __u32 ecn_mark; /* packets marked with ecn*/ }; +/* FQ PIE */ +enum { + TCA_FQ_PIE_UNSPEC, + TCA_FQ_PIE_LIMIT, + TCA_FQ_PIE_FLOWS, + TCA_FQ_PIE_TARGET, + TCA_FQ_PIE_TUPDATE, + TCA_FQ_PIE_ALPHA, + TCA_FQ_PIE_BETA, + TCA_FQ_PIE_QUANTUM, + TCA_FQ_PIE_MEMORY_LIMIT, + TCA_FQ_PIE_ECN_PROB, + TCA_FQ_PIE_ECN, + TCA_FQ_PIE_BYTEMODE, + TCA_FQ_PIE_DQ_RATE_ESTIMATOR, + __TCA_FQ_PIE_MAX +}; +#define TCA_FQ_PIE_MAX (__TCA_FQ_PIE_MAX - 1) + +struct tc_fq_pie_xstats { + __u32 packets_in; /* total number of packets enqueued */ + __u32 dropped; /* packets dropped due to fq_pie_action */ + __u32 overlimit; /* dropped due to lack of space in queue */ + __u32 overmemory; /* dropped due to lack of memory in queue */ + __u32 ecn_mark; /* packets marked with ecn */ + __u32 new_flow_count; /* count of new flows created by packets */ + __u32 new_flows_len; /* count of flows in new list */ + __u32 old_flows_len; /* count of flows in old list */ + __u32 memory_usage; /* total memory across all queues */ +}; + /* CBS */ struct tc_cbs_qopt { __u8 offload; -- cgit v1.2.3