We have found that MLX5 will trigger a dump_cqe if we don't invalidate the rkey on a newly alloated MR for FastReg usage. This fix just tags the MR as invalid on its creation if we are using FastReg and that will force it to do an invalidate of the rkey on first usage. Signed-off-by: Doug Oucharek <doug.s.oucharek@xxxxxxxxx> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8752 Reviewed-on: https://review.whamcloud.com/24306 Reviewed-by: Dmitry Eremin <dmitry.eremin@xxxxxxxxx> Reviewed-by: Amir Shehata <amir.shehata@xxxxxxxxx> Reviewed-by: James Simmons <uja.ornl@xxxxxxxxx> Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx> Signed-off-by: Doug Oucharek <dougso@xxxxxx> --- drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c index 7ae2955..00ebc61 100644 --- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c +++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c @@ -1384,7 +1384,10 @@ static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps, struct kib_fmr_po goto out_middle; } - frd->frd_valid = true; + /* There appears to be a bug in MLX5 code where you must + * invalidate the rkey of a new FastReg pool before first + * using it. Thus, I am marking the FRD invalid here. */ + frd->frd_valid = false; list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list); fpo->fast_reg.fpo_pool_size++; -- 1.8.3.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
