[PATCH for-rc 0/5] IB/hfi1: Fixes for 5.1 rc cycle

[PATCH for-rc 0/5] IB/hfi1: Fixes for 5.1 rc cycle

[Dennis Dalessandro]

Here is a set of small fixes that we would like to land in the rc cycle
for 5.1. One of them is marked as stable.

The first patch fixes an unnecessary stack trace due to incorrect WQ flags. The
next three fix issues uncovered due to TID RDMA which was brought in for 5.1.
The last one is a bug in VNIC.

---

Kaike Wan (4):
      IB/hfi1: Failed to drain send queue when QP is put into error state
      IB/hfi1: Clear the IOWAIT pending bits when QP is put into error state
      IB/hfi1: Eliminate opcode tests on mr deref
      IB/hfi1: Fix the allocation of RSM table

Mike Marciniszyn (1):
      IB/hfi1: Fix WQ_MEM_RECLAIM warning


 drivers/infiniband/hw/hfi1/chip.c |   26 +++++++++++++++++++-------
 drivers/infiniband/hw/hfi1/init.c |    3 ++-
 drivers/infiniband/hw/hfi1/qp.c   |    4 +++-
 drivers/infiniband/hw/hfi1/rc.c   |    4 ++--
 4 files changed, 26 insertions(+), 11 deletions(-)

--
-Denny

[PATCH for-rc 2/5] IB/hfi1: Failed to drain send queue when QP is put into error state

[Dennis Dalessandro]

From: Kaike Wan <kaike.wan@intel.com>

When a QP is put into error state, all pending requests in the send
work queue should be drained. The following sequence of events could
lead to a failure, causing a request to hang:
(1) The QP builds a packet and tries to send through SDMA engine.
However, PIO engine is still busy. Consequently, this packet is put
on the QP's tx list and the QP is put on the PIO waiting list. The
field qp->s_flags is set with HFI1_S_WAIT_PIO_DRAIN;
(2) The QP is put into error state by the user application and
notify_error_qp() is called, which removes the QP from the PIO waiting
list and the packet from the QP's tx list. In addition, qp->s_flags
is cleared of RVT_S_ANY_WAIT_IO bits, which does not include
HFI1_S_WAIT_PIO_DRAIN bit;
(3) The hfi1_schdule_send() function is called to drain the QP's send
queue. Subsequently, hfi1_do_send() is called. Since the flag bit
HFI1_S_WAIT_PIO_DRAIN is set in qp->s_flags, hfi1_send_ok() fails.
As a result, hfi1_do_send() bails out without draining any request
from the send queue;
(4) The PIO engine completes the sending and tries to wake up any QP
on its waiting list. But the QP has been removed from the PIO waiting
list and therefore is kept in sleep forever.

The fix is to clear qp->s_flags of HFI1_S_ANY_WAIT_IO bits in step (2).
HFI1_S_ANY_WAIT_IO includes RVT_S_ANY_WAIT_IO and HFI1_S_WAIT_PIO_DRAIN.


Fixes: 2e2ba09e48b7 ("IB/rdmavt, IB/hfi1: Create device dependent s_flags")
Cc: <stable@vger.kernel.org> # 4.19.x+
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
---
 drivers/infiniband/hw/hfi1/qp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c
index 9b643c2..64889ed 100644
--- a/drivers/infiniband/hw/hfi1/qp.c
+++ b/drivers/infiniband/hw/hfi1/qp.c
@@ -898,7 +898,7 @@ void notify_error_qp(struct rvt_qp *qp)
 		if (!list_empty(&priv->s_iowait.list) &&
 		    !(qp->s_flags & RVT_S_BUSY) &&
 		    !(priv->s_flags & RVT_S_BUSY)) {
-			qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
+			qp->s_flags &= ~HFI1_S_ANY_WAIT_IO;
 			list_del_init(&priv->s_iowait.list);
 			priv->s_iowait.lock = NULL;
 			rvt_put_qp(qp);

Re: [PATCH for-rc 2/5] IB/hfi1: Failed to drain send queue when QP is put into error state

[Jason Gunthorpe]

On Mon, Mar 25, 2019 at 12:38:23AM +0000, Sasha Levin wrote:
> Hi,
> 
> [This is an automated email]
> 
> This commit has been processed because it contains a "Fixes:" tag,
> fixing commit: 2e2ba09e48b7 IB/rdmavt, IB/hfi1: Create device
> dependent s_flags.

This patch hasn't even been accepted to any trees yet. Why are you
looking at it?

Jason

Re: [PATCH for-rc 0/5] IB/hfi1: Fixes for 5.1 rc cycle

[Jason Gunthorpe]

On Mon, Mar 18, 2019 at 09:54:55AM -0700, Dennis Dalessandro wrote:
> Here is a set of small fixes that we would like to land in the rc cycle
> for 5.1. One of them is marked as stable.
> 
> The first patch fixes an unnecessary stack trace due to incorrect WQ flags. The
> next three fix issues uncovered due to TID RDMA which was brought in for 5.1.
> The last one is a bug in VNIC.
> 
> 
> Kaike Wan (4):
>       IB/hfi1: Failed to drain send queue when QP is put into error state
>       IB/hfi1: Clear the IOWAIT pending bits when QP is put into error state
>       IB/hfi1: Eliminate opcode tests on mr deref
>       IB/hfi1: Fix the allocation of RSM table

Applied these ones to for-rc

> Mike Marciniszyn (1):
>       IB/hfi1: Fix WQ_MEM_RECLAIM warning

Let us see how the discussion goes here

Thanks,
Jason