From: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
Describe the specification of tc qdisc DualPI2 stats and attributes, which is the reference implementation of IETF RFC9332 DualQ Coupled AQM (https://datatracker.ietf.org/doc/html/rfc9332) to provide two queues called low latency and classic.
Signed-off-by: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com --- Documentation/netlink/specs/tc.yaml | 144 ++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+)
diff --git a/Documentation/netlink/specs/tc.yaml b/Documentation/netlink/specs/tc.yaml index aacccea5dfe4..0fb971935285 100644 --- a/Documentation/netlink/specs/tc.yaml +++ b/Documentation/netlink/specs/tc.yaml @@ -816,6 +816,58 @@ definitions: - name: drop-overmemory type: u32 + - + name: tc-dualpi2-xstats + type: struct + members: + - + name: prob + type: u32 + doc: Current probability + - + name: delay_c + type: u32 + doc: Current C-queue delay in microseconds + - + name: delay_l + type: u32 + doc: Current L-queue delay in microseconds + - + name: pkts_in_c + type: u32 + doc: Number of packets enqueued in the C-queue + - + name: pkts_in_l + type: u32 + doc: Number of packets enqueued in the L-queue + - + name: maxq + type: u32 + doc: Maximum number of packets seen by the DualPI2 + - + name: ecn_mark + type: u32 + doc: All packets marked with ecn + - + name: step_mark + type: u32 + doc: Only packets marked with ecn due to L-queue step AQM + - + name: credit + type: s32 + doc: Current credit value for WRR + - + name: memory_used + type: u32 + doc: Memory used in bytes by the DualPI2 + - + name: max_memory_used + type: u32 + doc: Maximum memory used in bytes by the DualPI2 + - + name: memory_limit + type: u32 + doc: Memory limit in bytes - name: tc-fq-pie-xstats type: struct @@ -2299,6 +2351,92 @@ attribute-sets: - name: quantum type: u32 + - + name: tc-dualpi2-attrs + attributes: + - + name: limit + type: u32 + doc: Limit of total number of packets in queue + - + name: memlimit + type: u32 + doc: Memory limit of total number of packets in queue + - + name: target + type: u32 + doc: Classic target delay in microseconds + - + name: tupdate + type: u32 + doc: Drop probability update interval time in microseconds + - + name: alpha + type: u32 + doc: Integral gain factor in Hz for PI controller + - + name: beta + type: u32 + doc: Proportional gain factor in Hz for PI controller + - + name: step_thresh + type: u32 + doc: L4S step marking threshold in microseconds or in packet (see step_packets) + - + name: step_packets + type: flags + doc: L4S Step marking threshold unit + entries: + - microseconds + - packets + - + name: min_qlen_step + type: u32 + doc: Pacekts enqueued to the L-queue can apply the step threshold when the queue length of L-queue is larger than this value. (0 is recommended) + - + name: coupling_factor + type: u8 + doc: Probability coupling factor between Classic and L4S (2 is recommended) + - + name: drop_overload + type: flags + doc: Control the overload strategy (drop to preserve latency or let the queue overflow) + entries: + - drop_on_overload + - overflow + - + name: drop_early + type: flags + doc: Decide where the Classic packets are PI-based dropped or marked + entries: + - drop_enqueue + - drop_dequeue + - + name: classic_protection + type: u8 + doc: Classic WRR weight in percentage (from 0 to 100) + - + name: ecn_mask + type: flags + doc: Configure the L-queue ECN classifier + entries: + - l4s_ect + - any_ect + - + name: gso_split + type: flags + doc: Split aggregated skb or not + entries: + - split_gso + - no_split_gso + - + name: max_rtt + type: u32 + doc: The maximum expected RTT of the traffic that is controlled by DualPI2 in usec + - + name: typical_rtt + type: u32 + doc: The typical base RTT of the traffic that is controlled by DualPI2 in usec - name: tc-ematch-attrs attributes: @@ -3679,6 +3817,9 @@ sub-messages: - value: drr attribute-set: tc-drr-attrs + - + value: dualpi2 + attribute-set: tc-dualpi2-attrs - value: etf attribute-set: tc-etf-attrs @@ -3846,6 +3987,9 @@ sub-messages: - value: codel fixed-header: tc-codel-xstats + - + value: dualpi2 + fixed-header: tc-dualpi2-xstats - value: fq fixed-header: tc-fq-qd-stats