From: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
Introduce 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) providing two different queues: low latency queue (L-queue) and classic queue (C-queue).
Signed-off-by: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
--- v21: - Replace step-thresh and step-packets with step-thresh-pkts and step-thresh-us - Remove redundant name-prefix and simplify entries of dualpi2 enums - Fix some typos and format issues of dualpi2 attributes
v20: - Remove double-prefixed of "tc_tc_dualpi2_attrs" in tc-user.h
v19: - Wrap long lines to within 80 characters
v18: - Fix name and name-prefix of DualPI2 enum and attribute
v17: - Rebase tc.yaml on commit ba5a199b2401d and commit f9aec8025ab5f --- Documentation/netlink/specs/tc.yaml | 151 +++++++++++++++++++++++++++- 1 file changed, 149 insertions(+), 2 deletions(-)
diff --git a/Documentation/netlink/specs/tc.yaml b/Documentation/netlink/specs/tc.yaml index e983c0c82eb9..b1afc7ab3539 100644 --- a/Documentation/netlink/specs/tc.yaml +++ b/Documentation/netlink/specs/tc.yaml @@ -56,6 +56,23 @@ definitions: - tundf - tunoam - tuncrit + - + name: dualpi2-drop-overload + type: enum + entries: [overflow, drop] + - + name: dualpi2-drop-early + type: enum + entries: [drop-dequeue, drop-enqueue] + - + name: dualpi2-ecn-mask + type: enum + value-start: 1 + entries: [l4s-ect, cla-ect, any-ect] + - + name: dualpi2-split-gso + type: enum + entries: [no-split-gso, split-gso] - name: tc-stats type: struct @@ -825,6 +842,58 @@ definitions: - name: drop-overmemory type: u32 + - + name: tc-dualpi2-xstats + type: struct + members: + - + name: prob + type: u32 + doc: Current base PI 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 @@ -848,7 +917,7 @@ definitions: - name: ecn-mark type: u32 - doc: Packets marked with ecn + doc: Packets marked with ECN - name: new-flow-count type: u32 @@ -991,7 +1060,7 @@ definitions: - name: ecn-mark type: u32 - doc: Packets marked with ecn + doc: Packets marked with ECN - name: tc-red-xstats type: struct @@ -2284,6 +2353,78 @@ attribute-sets: - name: quantum type: u32 + - + name: dualpi2-attrs + name-prefix: tca-dualpi2- + attributes: + - + name: limit + type: u32 + doc: Limit of total number of packets in queue + - + name: memory-limit + 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-pkts + type: u32 + doc: L4S step marking threshold in packets + - + name: step-thresh-us + type: u32 + doc: L4S Step marking threshold in microseconds + - + name: min-qlen-step + type: u32 + doc: Packets 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 + type: u8 + doc: Probability coupling factor between Classic and L4S + (2 is recommended) + - + name: drop-overload + type: u8 + doc: Control the overload strategy (drop to preserve latency or + let the queue overflow) + enum: dualpi2-drop-overload + - + name: drop-early + type: u8 + doc: Decide where the Classic packets are PI-based dropped or marked + enum: dualpi2-drop-early + - + name: c-protection + type: u8 + doc: Classic WRR weight in percentage (from 0 to 100) + - + name: ecn-mask + type: u8 + doc: Configure the L-queue ECN classifier + enum: dualpi2-ecn-mask + - + name: split-gso + type: u8 + doc: Split aggregated skb or not + enum: dualpi2-split-gso - name: ematch-attrs name-prefix: tca-ematch- @@ -3708,6 +3849,9 @@ sub-messages: - value: drr attribute-set: drr-attrs + - + value: dualpi2 + attribute-set: dualpi2-attrs - value: etf attribute-set: etf-attrs @@ -3875,6 +4019,9 @@ sub-messages: - value: codel fixed-header: tc-codel-xstats + - + value: dualpi2 + fixed-header: tc-dualpi2-xstats - value: fq fixed-header: tc-fq-qd-stats