Fix the cache save

[SchSeba]

before we send a pointer to the netConf object so the marshal function didn't parse all the information needed

[SchSeba]

Hi @zeeke @Eoghan1232 please review CRITICAL bug in the cni

[SchSeba]

without this PR this is the info saved in the cache folder

cat /var/lib/cni/sriov/ae5482e8bc9691863727dbae943daebf6c0f91263f9e35905cf5b55d4b11c1ea-net1 
{"capabilities":{"ips":true,"mac":true},"cniVersion":"1.0.0","ipam":{"type":"static"},"name":"test-sriov-static-usual","type":"sriov"}

we don't have DeviceID so the cni failed on cmdDel function

[coveralls]

Pull Request Test Coverage Report for Build 9212724446

Details

• 17 of 28 (60.71%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.4%) to 50.923%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/utils/utils.go	2	3	66.67%
pkg/types/types.go	15	25	60.0%
<!--	Total:	17	28	60.71%	-->

Totals
Change from base Build 9019301759:	1.4%
Covered Lines:	662
Relevant Lines:	1300

---

💛 - Coveralls

[mlguerrero12]

what changed? The marshal of an interface that holds a pointer is the value that the pointer points to. This has been here for a while. What am I missing?

[SchSeba]

Hi @mlguerrero12 thanks for the comment!

I don't know exactly. I am trying to understand I was able to find that the MTU PR was the one that introduced the change

[SchSeba]

/hold

[SchSeba]

Hi @mlguerrero12 I found the issue. the bump of the CNI package.

the CNI package overrides the default marshal function

https://github.com/containernetworking/cni/blob/main/pkg/types/types.go#L86

/hold cancel

[mlguerrero12]

Good catch @SchSeba. I suggest to change the signature of SaveNetConf to func SaveNetConf(cid, dataDir, podIfName string, conf types.NetConf) to make it explicit that it should not be a pointer.

I was going to suggest, as a nit, to ignore the field MTU for marshalling/unmarshalling by adding json:"-" and then I realized that DPDKMode also have it. So, in cmdDel, this is always false even when it is dpdk. I ran a small test for LoadConfFromCache. I haven´t checked the actual logs, but it seems to me that during a delete for dpdk, the first time it fails in ReleaseVF (line 288) and then the next iteration succeeds since we delete the cache and return nil. Only the deletion of the allocator is missing to execute which is not a big problem. Anyway, this is outside of the scope of this pr.

[zeeke]

Good catch @SchSeba. I suggest to change the signature of SaveNetConf to func SaveNetConf(cid, dataDir, podIfName string, conf types.NetConf) to make it explicit that it should not be a pointer.

+1 on changing the signature of SaveNetConf: conf interface{} -> conf types.NetConf

other than that. LGTM

[SchSeba]

Hi @mlguerrero12 @zeeke thanks for the comment please take another look when you have time

[SchSeba]

I just squash the commits waiting for a clean CI and I will merge this one