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Subject[PATCH 4.14 113/267] IB/hfi1: Close VNIC sdma_progress sleep window
Date
From: Mike Marciniszyn <mike.marciniszyn@intel.com>

[ Upstream commit 18912c4524385dd6532c682cb9d4f6aa39ba8d47 ]

The call to sdma_progress() is called outside the wait lock.

In this case, there is a race condition where sdma_progress() can return
false and the sdma_engine can idle. If that happens, there will be no
more sdma interrupts to cause the wakeup and the vnic_sdma xmit will hang.

Fix by moving the lock to enclose the sdma_progress() call.

Also, delete the tx_retry. The need for this was removed by:
commit bcad29137a97 ("IB/hfi1: Serve the most starved iowait entry first")

Fixes: 64551ede6cd1 ("IB/hfi1: VNIC SDMA support")
Reviewed-by: Gary Leshner <Gary.S.Leshner@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/hfi1/vnic_sdma.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/vnic_sdma.c b/drivers/infiniband/hw/hfi1/vnic_sdma.c
index c3c96c5869ed4..718dcdef946ee 100644
--- a/drivers/infiniband/hw/hfi1/vnic_sdma.c
+++ b/drivers/infiniband/hw/hfi1/vnic_sdma.c
@@ -57,7 +57,6 @@

#define HFI1_VNIC_TXREQ_NAME_LEN 32
#define HFI1_VNIC_SDMA_DESC_WTRMRK 64
-#define HFI1_VNIC_SDMA_RETRY_COUNT 1

/*
* struct vnic_txreq - VNIC transmit descriptor
@@ -67,7 +66,6 @@
* @pad: pad buffer
* @plen: pad length
* @pbc_val: pbc value
- * @retry_count: tx retry count
*/
struct vnic_txreq {
struct sdma_txreq txreq;
@@ -77,8 +75,6 @@ struct vnic_txreq {
unsigned char pad[HFI1_VNIC_MAX_PAD];
u16 plen;
__le64 pbc_val;
-
- u32 retry_count;
};

static void vnic_sdma_complete(struct sdma_txreq *txreq,
@@ -196,7 +192,6 @@ int hfi1_vnic_send_dma(struct hfi1_devdata *dd, u8 q_idx,
ret = build_vnic_tx_desc(sde, tx, pbc);
if (unlikely(ret))
goto free_desc;
- tx->retry_count = 0;

ret = sdma_send_txreq(sde, &vnic_sdma->wait, &tx->txreq,
vnic_sdma->pkts_sent);
@@ -238,14 +233,14 @@ static int hfi1_vnic_sdma_sleep(struct sdma_engine *sde,
struct hfi1_vnic_sdma *vnic_sdma =
container_of(wait, struct hfi1_vnic_sdma, wait);
struct hfi1_ibdev *dev = &vnic_sdma->dd->verbs_dev;
- struct vnic_txreq *tx = container_of(txreq, struct vnic_txreq, txreq);

- if (sdma_progress(sde, seq, txreq))
- if (tx->retry_count++ < HFI1_VNIC_SDMA_RETRY_COUNT)
- return -EAGAIN;
+ write_seqlock(&dev->iowait_lock);
+ if (sdma_progress(sde, seq, txreq)) {
+ write_sequnlock(&dev->iowait_lock);
+ return -EAGAIN;
+ }

vnic_sdma->state = HFI1_VNIC_SDMA_Q_DEFERRED;
- write_seqlock(&dev->iowait_lock);
if (list_empty(&vnic_sdma->wait.list))
iowait_queue(pkts_sent, wait, &sde->dmawait);
write_sequnlock(&dev->iowait_lock);
--
2.20.1


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