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Date: Thu, 06 Jan 2022 21:58:19 +0100 From: Toke Høiland-Jørgensen <toke@...e.dk> To: Kevin Bracey <kevin@...cey.fi>, netdev@...r.kernel.org Subject: Re: [PATCH net] sch_cake: revise Diffserv docs Kevin Bracey <kevin@...cey.fi> writes: > Documentation incorrectly stated that CS1 is equivalent to LE for > diffserv8. But when LE was added to the table, CS1 was pushed into tin > 1, leaving only LE in tin 0. > > Also "TOS1" no longer exists, as that is the same codepoint as LE. > > Make other tweaks properly distinguishing codepoints from classes and > putting current Diffserve codepoints ahead of legacy ones. > > Signed-off-by: Kevin Bracey <kevin@...cey.fi> Thank you for the fix. A few comments below. I'm on the fence as to whether this should be a fix against -net, or if it's better to just target net-next. If you do think it should go into -net as a fix, please add an appropriate Fixes tag, probably: Fixes: b8392808eb3f ("sch_cake: add RFC 8622 LE PHB support to CAKE diffserv handling") > --- > net/sched/sch_cake.c | 40 ++++++++++++++++++++-------------------- > 1 file changed, 20 insertions(+), 20 deletions(-) > > diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c > index 857aaebd49f4..64692414c0e5 100644 > --- a/net/sched/sch_cake.c > +++ b/net/sched/sch_cake.c > @@ -2342,9 +2342,7 @@ static int cake_config_precedence(struct Qdisc *sch) > > /* List of known Diffserv codepoints: > * > - * Least Effort (CS1, LE) > - * Best Effort (CS0) > - * Max Reliability & LLT "Lo" (TOS1) > + * Default Forwarding (DF/CS0) I'm fine with adding the Default Forwarding designation, but please keep the "Best Effort" moniker as well; it's commonly used in colloquial speech, so I'd like to keep it here for people who go looking. > * Max Throughput (TOS2) > * Min Delay (TOS4) > * LLT "La" (TOS5) > @@ -2352,6 +2350,7 @@ static int cake_config_precedence(struct Qdisc *sch) > * Assured Forwarding 2 (AF2x) - x3 > * Assured Forwarding 3 (AF3x) - x3 > * Assured Forwarding 4 (AF4x) - x3 > + * Precedence Class 1 (CS1) > * Precedence Class 2 (CS2) > * Precedence Class 3 (CS3) > * Precedence Class 4 (CS4) > @@ -2360,8 +2359,9 @@ static int cake_config_precedence(struct Qdisc *sch) > * Precedence Class 7 (CS7) > * Voice Admit (VA) > * Expedited Forwarding (EF) > - > - * Total 25 codepoints. > + * Lower Effort (LE) > + * > + * Total 26 codepoints. > */ > > /* List of traffic classes in RFC 4594, updated by RFC 8622: > @@ -2375,12 +2375,12 @@ static int cake_config_precedence(struct Qdisc *sch) > * Realtime Interactive (CS4) - eg. games > * Multimedia Streaming (AF3x) - eg. YouTube, NetFlix, Twitch > * Broadcast Video (CS3) > - * Low Latency Data (AF2x,TOS4) - eg. database > - * Ops, Admin, Management (CS2,TOS1) - eg. ssh > - * Standard Service (CS0 & unrecognised codepoints) > - * High Throughput Data (AF1x,TOS2) - eg. web traffic > - * Low Priority Data (CS1,LE) - eg. BitTorrent > - > + * Low-Latency Data (AF2x,TOS4) - eg. database > + * Ops, Admin, Management (CS2) - eg. ssh > + * Standard Service (DF & unrecognised codepoints) > + * High-Throughput Data (AF1x,TOS2) - eg. web traffic > + * Low-Priority Data (LE,CS1) - eg. BitTorrent > + * > * Total 12 traffic classes. > */ > > @@ -2390,12 +2390,12 @@ static int cake_config_diffserv8(struct Qdisc *sch) > * > * Network Control (CS6, CS7) > * Minimum Latency (EF, VA, CS5, CS4) > - * Interactive Shell (CS2, TOS1) > + * Interactive Shell (CS2) > * Low Latency Transactions (AF2x, TOS4) > * Video Streaming (AF4x, AF3x, CS3) > - * Bog Standard (CS0 etc.) > - * High Throughput (AF1x, TOS2) > - * Background Traffic (CS1, LE) > + * Bog Standard (DF etc.) > + * High Throughput (AF1x, TOS2, CS1) > + * Background Traffic (LE) > * > * Total 8 traffic classes. > */ > @@ -2437,9 +2437,9 @@ static int cake_config_diffserv4(struct Qdisc *sch) > /* Further pruned list of traffic classes for four-class system: > * > * Latency Sensitive (CS7, CS6, EF, VA, CS5, CS4) > - * Streaming Media (AF4x, AF3x, CS3, AF2x, TOS4, CS2, TOS1) > - * Best Effort (CS0, AF1x, TOS2, and those not specified) > - * Background Traffic (CS1, LE) > + * Streaming Media (AF4x, AF3x, CS3, AF2x, TOS4, CS2) > + * Best Effort (DF, AF1x, TOS2, and those not specified) > + * Background Traffic (LE, CS1) > * > * Total 4 traffic classes. > */ > @@ -2477,9 +2477,9 @@ static int cake_config_diffserv4(struct Qdisc *sch) > static int cake_config_diffserv3(struct Qdisc *sch) > { > /* Simplified Diffserv structure with 3 tins. > - * Low Priority (CS1, LE) > + * Low Priority (LE, CS1) > * Best Effort > - * Latency Sensitive (TOS4, VA, EF, CS6, CS7) > + * Latency Sensitive (CS7, CS6, EF, VA, TOS4) While you're fixing things up, could you please also swap the order of the lines here, so it goes from high-to-low priority like the others? -Toke
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