[openib-general] is wc valid if ib_poll_cq() returns zero

[somenath]

Sean Hefty wrote:

> somenath wrote:
>
>> int
>> io_complete(
>>        struct  ib_cq *cq,
>>        void *passed_arg)
>> {
>>    xxx_connection_t    *arg = passed_arg;
>>    xxx_status_t    stat = xxx_st_ok;
>>    struct ib_wc wc;
>>    int count = 0;
>>
>>    if (count = ib_poll_cq(cq, 1, &wc) < 0) {
>
>
> I think this evaluates ib_poll_cq(..) < 0 before doing the 
> assignment.  Since the expression evaluates to false, count is 
> assigned 0.  Can you try modifying this to:
>
> if ((count = ib_poll_cq(..)) < 0)
>
> - Sean

I added that stuff, but it didn't make a difference...it still returned 
0....

thanks anyway for suggesting....

looks like, I may be getting a valid entry even if ib_poll_cq() is 
returning zero...
is that possible?

I am going to try it anyway, even if the ib_poll_cq() returns zero, go 
ahead and try to use the wc..





dump of wc entry from recv side, looks like many are valid entries (like 
wr_id, length, op etc..)

wr_id=0x10118163c00 status=0x0 op=0x80
vendor_err=0x246 byte_len=0x2028 imm_data=0xa0367eb8
qp_num=0x404 src_qp=0x68 wc_flags=0x0
pkey_index=0x0 slid=0x0 sl=0x0
dlid_path_bits=0x0 port_num=0xff

som.