linux-kernel - [PATCH for-rc 8/9] RDMA/hns: Fix insufficient extend DB for VFs.

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Message-ID: <20240705085937.1644229-9-huangjunxian6@hisilicon.com>
Date: Fri, 5 Jul 2024 16:59:36 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: <jgg@...pe.ca>, <leon@...nel.org>
CC: <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>
Subject: [PATCH for-rc 8/9] RDMA/hns: Fix insufficient extend DB for VFs.

From: Chengchang Tang <tangchengchang@...wei.com>

VFs and its PF will share the memory of the extend DB. Currently,
the number of extend DB allocated by driver is only enough for PF.
This leads to a probability of DB loss and some other problems in
scenarios where both PF and VFs use a large number of QPs.

Fixes: 6b63597d3540 ("RDMA/hns: Add TSQ link table support")
Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 6cdeafef800a..1d72c8d47ae7 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -2468,14 +2468,16 @@ static int set_llm_cfg_to_hw(struct hns_roce_dev *hr_dev,
 static struct hns_roce_link_table *
 alloc_link_table_buf(struct hns_roce_dev *hr_dev)
 {
+	u16 total_sl = hr_dev->caps.sl_num * hr_dev->func_num;
 	struct hns_roce_v2_priv *priv = hr_dev->priv;
 	struct hns_roce_link_table *link_tbl;
 	u32 pg_shift, size, min_size;
 
 	link_tbl = &priv->ext_llm;
 	pg_shift = hr_dev->caps.llm_buf_pg_sz + PAGE_SHIFT;
-	size = hr_dev->caps.num_qps * HNS_ROCE_V2_EXT_LLM_ENTRY_SZ;
-	min_size = HNS_ROCE_EXT_LLM_MIN_PAGES(hr_dev->caps.sl_num) << pg_shift;
+	size = hr_dev->caps.num_qps * hr_dev->func_num *
+	       HNS_ROCE_V2_EXT_LLM_ENTRY_SZ;
+	min_size = HNS_ROCE_EXT_LLM_MIN_PAGES(total_sl) << pg_shift;
 
 	/* Alloc data table */
 	size = max(size, min_size);
-- 
2.33.0