[PATCH for-next 01/17] RDMA/bnxt_re: wraparound mbox producer index

[Selvin Xavier <selvin.xavier@broadcom.com>]

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From: Kashyap Desai <kashyap.desai@broadcom.com>

Driver is not handling the wraparound of the mbox producer index correctly.
Currently the wraparound happens once u32 max is reached.

Bit 31 of the producer index register is special and should be set
only once for the first command. Because the producer index overflow
setting bit31 after a long time, FW goes to initialization sequence
and this causes FW hang.

Fix is to wraparound the mbox producer index once it reaches u16 max.

Fixes: cee0c7bba486 ("RDMA/bnxt_re: Refactor command queue management code")
Fixes: 1ac5a4047975 ("RDMA/bnxt_re: Add bnxt_re RoCE driver")
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/qplib_rcfw.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
index 688eaa0..d4ce82b 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
@@ -180,7 +180,7 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw,
 	} while (bsize > 0);
 	cmdq->seq_num++;
 
-	cmdq_prod = hwq->prod;
+	cmdq_prod = hwq->prod & 0xFFFF;
 	if (test_bit(FIRMWARE_FIRST_FLAG, &cmdq->flags)) {
 		/* The very first doorbell write
 		 * is required to set this flag
@@ -599,7 +599,7 @@ int bnxt_qplib_alloc_rcfw_channel(struct bnxt_qplib_res *res,
 		rcfw->cmdq_depth = BNXT_QPLIB_CMDQE_MAX_CNT_8192;
 
 	sginfo.pgsize = bnxt_qplib_cmdqe_page_size(rcfw->cmdq_depth);
-	hwq_attr.depth = rcfw->cmdq_depth;
+	hwq_attr.depth = rcfw->cmdq_depth & 0x7FFFFFFF;
 	hwq_attr.stride = BNXT_QPLIB_CMDQE_UNITS;
 	hwq_attr.type = HWQ_TYPE_CTX;
 	if (bnxt_qplib_alloc_init_hwq(&cmdq->hwq, &hwq_attr)) {
-- 
2.5.5


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