Hi,
On 31 October 2016 at 02:47, Sagi Grimberg <sagi@xxxxxxxxxxx> wrote:
> How is this simpler?
It is simpler in the sense that it is a light weight primitive and that only
one thread waits on the event here. In our case since 'umr_context.done'
is an "on stack" variable, and has only one thread waiting on that event,
no race conditions occur. So, we do not need completions here which
are usually used to provide a race-free but easy-to-use solution involving
multiple threads waiting on an event.
>> enum ib_wc_status {
>> + IB_WC_STATUS_NONE = -1,
>> IB_WC_SUCCESS,
>> IB_WC_LOC_LEN_ERR,
>> IB_WC_LOC_QP_OP_ERR,
>>
>
> Huh? Where did this bogus status came from? IMHO, this is polluting
> the verbs interface for no good reason at all, sorry.
context->status is initialized to -1 in the following code, so I just thought of
replacing it with a name.
static inline void mlx5_ib_init_umr_context(struct mlx5_ib_umr_context *context)
{
context->cqe.done = mlx5_ib_umr_done;
- context->status = -1;
- init_completion(&context->done);
+ context->status = IB_WC_STATUS_NONE;
+ init_waitqueue_head(&context->wq);
}
Thanks,
Binoy
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