[PATCH 6.6 169/283] RDMA/hns: Notify ULP of remaining soft-WCs during reset

Sasha Levin
2026-02-28T18:09:31Z

From: Chengchang Tang <tangchengchang@huawei.com>

[ Upstream commit 0789f929900d85b80b343c5f04f8b9444e991384 ]

During a reset, software-generated WCs cannot be reported via
interrupts. This may cause the ULP to miss some WCs.

To avoid this, add check in the CQ arm process: if a hardware reset
has occurred and there are still unreported soft-WCs, notify the ULP
to handle the remaining WCs, thereby preventing any loss of completions.

Fixes: 626903e9355b ("RDMA/hns: Add support for reporting wc as software mode")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20260104064057.1582216-5-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 23 ++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 2d4b751fc709d..b50529a652741 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -3588,6 +3588,23 @@ static void hns_roce_v2_write_cqc(struct hns_roce_dev *hr_dev,
HNS_ROCE_V2_CQ_DEFAULT_INTERVAL);
}

+static bool left_sw_wc(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq)
+{
+ struct hns_roce_qp *hr_qp;
+
+ list_for_each_entry(hr_qp, &hr_cq->sq_list, sq_node) {
+ if (hr_qp->sq.head != hr_qp->sq.tail)
+ return true;
+ }
+
+ list_for_each_entry(hr_qp, &hr_cq->rq_list, rq_node) {
+ if (hr_qp->rq.head != hr_qp->rq.tail)
+ return true;
+ }
+
+ return false;
+}
+
static int hns_roce_v2_req_notify_cq(struct ib_cq *ibcq,
enum ib_cq_notify_flags flags)
{
@@ -3596,6 +3613,12 @@ static int hns_roce_v2_req_notify_cq(struct ib_cq *ibcq,
struct hns_roce_v2_db cq_db = {};
u32 notify_flag;

+ if (hr_dev->state >= HNS_ROCE_DEVICE_STATE_RST_DOWN) {
+ if ((flags & IB_CQ_REPORT_MISSED_EVENTS) &&
+ left_sw_wc(hr_dev, hr_cq))
+ return 1;
+ return 0;
+ }
/*
* flags = 0, then notify_flag : next
* flags = 1, then notify flag : solocited
--
2.51.0