[ofa-general] Re: multiple threads posting to the same QP

[Dotan Barak]

Or Gerlitz wrote:
> Dotan Barak wrote:
>> Or Gerlitz wrote:
>>> Dotan, is there any mentioning of multiple thread scheme in the 
>>> libibverbs/librdmacm man pages?
>
>> As much as i know, libibverbs is a fully thread safe library.
>> I checked the code of the mthca and i noticed a spin lock before 
>> posting (SR or RR), so everything should be o.k. if you post from 
>> different threads in parallel .
>
> So the locking should be provided by the low-level per device library? 
> if this is the case, I fail to see this documented anywhere.
>
> Also do we actually want locking in the fast posting path? for example 
> is it legal to call send(2) on the same socket fd from two threads?
>
>> I didn't add any "thread" text in the man pages yet.
>> If you think that it is required, i will add it somewhere (i can add 
>> a new man file verbs.h.3 that will specify this).
>
> I suggest we first resolve it with Roland and then see what/how to 
> document this.
let's wait for Roland response on it.
>
> btw, I think it would be very helpful for users if there would be a 
> general man page to libibverbs, similar to the rdma_cm(7) page 
> provided by the librdmacm-util package
I will add it to my todo list for OFED 1.3



Dotan