[ofa-general] IB_WC_WR_FLUSH_ERR on receive requests

[Eli Cohen]

On Mon, 2007-11-26 at 13:13 +0800, Isaac Huang wrote:
> Hello,
> 
> Recently we observed a handful of IB_WC_WR_FLUSH_ERR errors on receive
> requests. I grepped through OFED 1.2.5.1 code and found that this
> error was mostly set in low level hw drivers. It also seemed that some
> ULPs didn't treat IB_WC_WR_FLUSH_ERR as a critical error, e.g. in
> ulp/ipoib/ipoib_cm.c:ipoib_ib_handle_rx_wc():
>          if (unlikely(wc->status != IB_WC_SUCCESS)) {
>                  if (wc->status != IB_WC_WR_FLUSH_ERR)
>                          ipoib_warn(priv, "failed recv event "
>                                     "(status=%d, wrid=%d vend_err %x)\n",
>                                     wc->status, wr_id, wc->vendor_err);
> 
> In what situations does this IB_WC_WR_FLUSH_ERR usually happen? Does it
> indicate any issue in the HCA hardware?

This flow does not necessarily indicate a problem. When the a QP is
closed, e.g. when the interface goes down, the QP is modified to error
and any pending receive WRs are completed with this error.