jeez / iproute2 Goto Github PK

I used the ubuntu 18.04 with Linux kernel 5.0.1 including "taprio" drivers at Networking support --> Networking options --> QOS and /or fair queueing. But when I run the "tc qdisc replace dev eth0 parent root handle 100 taprio " command, it gives error: "Unknown qdisc "taprio", hence option is unparsable". I wonder how to make the Linux support taprio. Can you give me a more detailed kernel configuration? Look forward to your kind reply. Thanks!

Hi @jeez @vcgomes ,

I was reading about the previously closed issue with respect to loading of ETF in dual core PCs. I was able to follow that and I got the mqprio qdisc loaded in my system successfully.

But when I try adding ETF as child to mqprio qdisc, system replies me " RTNETLINK answers: Operation not supported" error. Help me in solving this.

System details:
Linux x86 with 4.19 kernel and iproute2 4.19 version

Commands used:
sudo tc qdisc replace dev IFACE parent root handle 100 mqprio num_tc 2 map 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 queues 1@0 1@1 hw 0
sudo tc qdisc add dev IFACE parent 100:1 etf offload clockid CLOCK_TAI delta 150000

Hi @vcgomes,

In the recent times, I see that UDP packets are being dropped in kernel due to overlimits. I was reading a bit to understand the term "overlimits" in tc qdisc. From the study I infer that, it is the delay caused by qdisc and that's the reason packets are dropped when the txtime expires waiting in queue to be dequeued. Am I right? Or correct me if am wrong?

May I know why this scenario comes in?

Hi there,

I am working on time triggered send feature using ETF option. After installation of iproute2 package with ETF support, I am unable to schedule using ETF feature in i210.

I am getting the following errors:

• RTNETLINK answers: Invalid Argument
• RTNETLINK answers: No such file or directory

I have enabled ETF and CBS option in kernel and verified loaded modules. But still the above mentioned error persists when scheduling is loaded.
@jeez Any help on this would be appreciated!

Hi all:
I 've read this demo(https://patchwork.kernel.org/patch/10412213/) . it's awesome and expounds details step by setps about mqprio and cbs mechanism. but still i got questions , after traffic steering to different TX queue for their socker priority, what rule will TX queues follow to decide which pkt be the first to leave nic? Is TX0 have the highest priority to send pkt? or it depends on L2 priority field? really confusing about it , thanks.

Problem: When I run tc tool with "etf" it give Error: RTNETLINK answers: No such file or directory

I am quiet sure it is because some driver is missing in my Linux kernel: .config File.

Could you please let me know which Driver modules are explicitly required for ETF.

Command:
DSx86_32:/exchange/local# ./tc qdisc replace dev eth1 parent 100:1 etf clockid CLOCK_TAI delta 300000 offload
RTNETLINK answers: No such file or directory
DSx86_32:/exchange/local#

STRACE Output:

recvmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=120, type=NLMSG_ERROR, flags=NLM_F_ACK_TLVS, seq=1556017543, pid=2034}, {error=-ENOENT, msg={{len=64, type=0x24 /* NLMSG_??? */, flags=NLM_F_REQUEST|NLM_F_ACK|0x500, seq=1556017543, pid=0}, "\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x01\x00\x00\x00\x00\x08\x00\x01\x00\x6 5\x74\x66\x00\x14\x00\x02\x00"...}, {{nla_len=35, nla_type=NLMSGERR_ATTR_MSG}, "Failed to find specified qdisc"}}}, iov_len=32768}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 120
write(2, "RTNETLINK answers: No such file "..., 45RTNETLINK answers: No such file or directory
) = 45

Similar Problem I faced in past when used Tc tool with "mqprio" and "taprio" but it was solved when I included driver for respective feature.

for ex: Taprio works after including drivers at Networking support --> Networking options --> QOS and /or fair queueing

And

mqprio work after including all driver at Networking support --> Networking options --> Netfilter --> core netfilter configuration

you are requested to give your view.

Thanks & Regards
Bhaskar