6.11-stable review patch. If anyone has any objections, please let me know.
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From: Selvin Xavier selvin.xavier@broadcom.com
[ Upstream commit 8be3e5b0c96beeefe9d5486b96575d104d3e7d17 ]
Driver waits indefinitely for the fifo occupancy to go below a threshold as soon as the pacing interrupt is received. This can cause soft lockup on one of the processors, if the rate of DB is very high.
Add a loop count for FPGA and exit the __wait_for_fifo_occupancy_below_th if the loop is taking more time. Pacing will be continuing until the occupancy is below the threshold. This is ensured by the checks in bnxt_re_pacing_timer_exp and further scheduling the work for pacing based on the fifo occupancy.
Fixes: 2ad4e6303a6d ("RDMA/bnxt_re: Implement doorbell pacing algorithm") Link: https://patch.msgid.link/r/1728373302-19530-7-git-send-email-selvin.xavier@b... Reviewed-by: Kalesh AP kalesh-anakkur.purayil@broadcom.com Reviewed-by: Chandramohan Akula chandramohan.akula@broadcom.com Signed-off-by: Selvin Xavier selvin.xavier@broadcom.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/bnxt_re/main.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c index e06adb2dfe6f9..c905a51aabfba 100644 --- a/drivers/infiniband/hw/bnxt_re/main.c +++ b/drivers/infiniband/hw/bnxt_re/main.c @@ -518,6 +518,7 @@ static bool is_dbr_fifo_full(struct bnxt_re_dev *rdev) static void __wait_for_fifo_occupancy_below_th(struct bnxt_re_dev *rdev) { struct bnxt_qplib_db_pacing_data *pacing_data = rdev->qplib_res.pacing_data; + u32 retry_fifo_check = 1000; u32 fifo_occup;
/* loop shouldn't run infintely as the occupancy usually goes @@ -531,6 +532,14 @@ static void __wait_for_fifo_occupancy_below_th(struct bnxt_re_dev *rdev)
if (fifo_occup < pacing_data->pacing_th) break; + if (!retry_fifo_check--) { + dev_info_once(rdev_to_dev(rdev), + "%s: fifo_occup = 0x%xfifo_max_depth = 0x%x pacing_th = 0x%x\n", + __func__, fifo_occup, pacing_data->fifo_max_depth, + pacing_data->pacing_th); + break; + } + } }