Re: Problems using krping

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

lihaidong wrote:
> Mr.Wise
> |||                 else {
> ||| 
> |||                         cb->rdma_sq_wr.opcode = IB_WR_RDMA_READ;
> |||                         if (cb->mem == FASTREG) {
> |||                                 /* 
> |||                                  * Immediately follow the read with a 
> |||                                  * fenced LOCAL_INV.
> |||                                  */
> |||                                 cb->rdma_sq_wr.next = &inv;
> |||                                 memset(&inv, 0, sizeof inv);
> |||                                 inv.opcode = IB_WR_LOCAL_INV;
> |||                                 inv.ex.invalidate_rkey = cb->fastreg_mr->rkey;
> |||                                 inv.send_flags = IB_SEND_FENCE;
> |||                         }
> |||                 }
> ||| 
> |||                 ret = ib_post_send(cb->qp, &cb->rdma_sq_wr, &bad_wr);
> |||                 if (ret) {
> |||                         printk(KERN_ERR PFX "post send error %d\n", ret);
> |||                         break;
> |||                 }
> |||                 cb->rdma_sq_wr.next = NULL;
> the last line, is that safe? There's an invalidate wr following 
> rdma_sq_wr.This line will not disturb invalidate wr being performed in 
> lower level, right? 
>  

Correct.  The work requests are copied by the verbs layer.   So once you 
return from ib_post_send, the send work request structure itself can be 
reused/freed/whatever.


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