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Date: Mon, 18 Dec 2023 17:34:26 +0200 From: Roger Quadros <rogerq@...nel.org> To: Simon Horman <horms@...nel.org> Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, shuah@...nel.org, vladimir.oltean@....com, s-vadapalli@...com, r-gunasekaran@...com, vigneshr@...com, srk@...com, p-varis@...com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org Subject: Re: [PATCH net-next v9 08/10] net: ethernet: ti: am65-cpsw: add mqprio qdisc offload in channel mode Hi Simon, On 18/12/2023 15:43, Simon Horman wrote: > On Fri, Dec 15, 2023 at 03:20:46PM +0200, Roger Quadros wrote: >> From: Grygorii Strashko <grygorii.strashko@...com> >> >> This patch adds MQPRIO Qdisc offload in full 'channel' mode which allows >> not only setting up pri:tc mapping, but also configuring TX shapers >> (rate-limiting) on external port FIFOs. >> >> The MQPRIO Qdisc offload is expected to work with or without VLAN/priority >> tagged packets. >> >> The CPSW external Port FIFO has 8 Priority queues. The rate-limit can be >> set for each of these priority queues. Which Priority queue a packet is >> assigned to depends on PN_REG_TX_PRI_MAP register which maps header >> priority to switch priority. >> >> The header priority of a packet is assigned via the RX_PRI_MAP_REG which >> maps packet priority to header priority. >> >> The packet priority is either the VLAN priority (for VLAN tagged packets) >> or the thread/channel offset. >> >> For simplicity, we assign the same priority queue to all queues of a >> Traffic Class so it can be rate-limited correctly. >> >> Configuration example: >> ethtool -L eth1 tx 5 >> ethtool --set-priv-flags eth1 p0-rx-ptype-rrobin off >> >> tc qdisc add dev eth1 parent root handle 100: mqprio num_tc 3 \ >> map 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 \ >> queues 1@0 1@1 1@2 hw 1 mode channel \ >> shaper bw_rlimit min_rate 0 100mbit 200mbit max_rate 0 101mbit 202mbit >> >> tc qdisc replace dev eth2 handle 100: parent root mqprio num_tc 1 \ >> map 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 queues 1@0 hw 1 >> >> ip link add link eth1 name eth1.100 type vlan id 100 >> ip link set eth1.100 type vlan egress 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7 >> >> In the above example two ports share the same TX CPPI queue 0 for low >> priority traffic. 3 traffic classes are defined for eth1 and mapped to: >> TC0 - low priority, TX CPPI queue 0 -> ext Port 1 fifo0, no rate limit >> TC1 - prio 2, TX CPPI queue 1 -> ext Port 1 fifo1, CIR=100Mbit/s, EIR=1Mbit/s >> TC2 - prio 3, TX CPPI queue 2 -> ext Port 1 fifo2, CIR=200Mbit/s, EIR=2Mbit/s >> >> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com> >> Signed-off-by: Roger Quadros <rogerq@...nel.org> > > ... > >> diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.c b/drivers/net/ethernet/ti/am65-cpsw-qos.c >> index 9f0a05e763d1..7ad7af3b3c60 100644 >> --- a/drivers/net/ethernet/ti/am65-cpsw-qos.c >> +++ b/drivers/net/ethernet/ti/am65-cpsw-qos.c >> @@ -7,6 +7,7 @@ >> */ >> >> #include <linux/pm_runtime.h> >> +#include <linux/math.h> >> #include <linux/time.h> >> #include <net/pkt_cls.h> >> >> @@ -15,6 +16,8 @@ >> #include "am65-cpts.h" >> #include "cpsw_ale.h" >> >> +#define TO_MBPS(x) DIV_ROUND_UP((x), BYTES_PER_MBIT) > > Hi Grygorii and Roger, > > a minor nit from my side: in order for BYTES_PER_MBIT to be defined > linux/units.h needs to be included. But that isn't added until > the next patch. Thanks for the catch. I'll fix it in next spin. -- cheers, -roger
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