[DTrace-devel] [PATCH 1/5] udp: new provider

[Eugene Loh]

FWIW, we should have the "cg: fix offset for > 8 bit bitfields in 
dt_cg_ctf_offsetof()" patch land before this patch series does.

Anyhow, testing x86 and arm for OL8/UEK6 OL8/UEK7 OL9/UEK7 OL9/UEK8 
OL10/UEK8, I get
     test/unittest/udp/tst.ipv6localudp.sh: FAIL: expected results differ.
for
     x86/OL8/UEK7
     x86/OL9/UEK7
     x86/OL9/UEK8
     x86/OL10/UEK8
     arm/OL10/UEK8
If you like, I can investigate more or report more details.  I just 
didn't want to dive in too deep without checking in with you first.

I do not know how documentation will be handled, but it's possible we 
will start to see that become part of this repo, in which perhaps new 
providers need to be accompanied by doc updates.  But I guess that will 
be the burden of whichever patch comes second.

Why is the module for these probes "vmlinux" when not all the underlying 
probes are?
    ID   PROVIDER       MODULE                FUNCTION NAME
75616        fbt      vmlinux       udp_queue_rcv_skb entry
78708        fbt         ipv6     udpv6_queue_rcv_skb entry
74498        fbt      vmlinux             ip_send_skb entry
77968        fbt         ipv6            ip6_send_skb entry

I do not understand why the arg5 trick is needed, but I trust you!

On 8/22/25 14:16, Alan Maguire via DTrace-devel wrote:
> Based upon fbt probes support UDP send, receive.

To me, this would read more clearly if it were "Support UDP send and 
receive, using fbt probes."