On 7/26/2017 2:12 PM, Leon Romanovsky wrote:
From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
The commit ebc9ca43e1d5 ("IB/core: Allow QP state transition from reset to error")
allowed transition from Reset to Error state for the QPs. This behavior
doesn't follow the IBTA specification 1.3, which in 10.3.1 QUEUE PAIR AND
EE CONTEXT STATES section.
The quote from the spec:
"An error can be forced from any state, except Reset, with
the Modify QP/EE Verb."
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
---
drivers/infiniband/core/verbs.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index fb98ed67d5bc..7f8fe443df46 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -895,7 +895,6 @@ static const struct {
} qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
[IB_QPS_RESET] = {
[IB_QPS_RESET] = { .valid = 1 },
- [IB_QPS_ERR] = { .valid = 1 },
[IB_QPS_INIT] = {
.valid = 1,
.req_param = {
The diagram from that section clearly shows you can't go from reset to
error. However table 91 as in our original commit message says it could
go to error from any state. Taking a step back and thinking about it,
I'm not sure it really makes sense to be able to go from reset to error
anyway. There is nothing that can go wrong until the qp is transitioned
out of reset really.
Any idea why this patch was never adopted:
http://www.spinics.net/lists/linux-rdma/msg07627.html
This was during my storage hiatus so I wasn't following things RDMA back
then. However this seems like the correct approach to me. Granted that
patch would look different as the code has moved around but the same
sort of check could go in ipoib_ib_dev_stop_default().
-Denny
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