Re: [PATCH v5 04/17] octeontx2-pf: Initialize and config queues

I guess my question generally is, what form of RED is implemented in
the hardware?

http://mirrors.bufferbloat.net/~jg/RelevantPapers/Red_in_a_different_light.pdf

+/* RED and drop levels of CQ on packet reception.
+ * For CQ level is measure of emptiness ( 0x0 = full, 255 = empty).
+ */
+#define RQ_PASS_LVL_CQ(skid, qsize)    ((((skid) + 16) * 256) / (qsize))
+#define RQ_DROP_LVL_CQ(skid, qsize)    (((skid) * 256) / (qsize))
+
+/* RED and drop levels of AURA for packet reception.
+ * For AURA level is measure of fullness (0x0 = empty, 255 = full).
+ * Eg: For RQ length 1K, for pass/drop level 204/230.
+ * RED accepts pkts if free pointers > 102 & <= 205.
+ * Drops pkts if free pointers < 102.
+ */
+#define RQ_PASS_LVL_AURA (255 - ((95 * 256) / 100)) /* RED when 95% is full */
+#define RQ_DROP_LVL_AURA (255 - ((99 * 256) / 100)) /* Drop when 99% is full */

I guess my question generally is, what form of RED is implemented in
the hardware?

(what's aura?)

http://mirrors.bufferbloat.net/~jg/RelevantPapers/Red_in_a_different_light.pdf