RDMA/hns: Fix wrong maximum DMA segment size

Chengchang Tang · gregkh · commit 7060bf9100fa · 2025-04-25T10:47:40.000+02:00
[ Upstream commit 9beb2c9 ] Set maximum DMA segment size to 2G instead of UINT_MAX due to HW limit. Fixes: e0477b3 ("RDMA: Explicitly pass in the dma_device to ib_register_device") Link: https://patch.msgid.link/r/20250327114724.3454268-3-huangjunxian6@hisilicon.com Signed-off-by: Chengchang Tang <tangchengchang@huawei.com> Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -763,7 +763,7 @@ static int hns_roce_register_device(struct hns_roce_dev *hr_dev)
 		if (ret)
 			return ret;
 	}
-	dma_set_max_seg_size(dev, UINT_MAX);
+	dma_set_max_seg_size(dev, SZ_2G);
 	ret = ib_register_device(ib_dev, "hns_%d", dev);
 	if (ret) {
 		dev_err(dev, "ib_register_device failed!\n");

Original file line number	Diff line number	Diff line change
`@@ -763,7 +763,7 @@ static int hns_roce_register_device(struct hns_roce_dev *hr_dev)`
`763`	`763`	`if (ret)`
`764`	`764`	`return ret;`
`765`	`765`	`}`
`766`		`- dma_set_max_seg_size(dev, UINT_MAX);`
	`766`	`+ dma_set_max_seg_size(dev, SZ_2G);`
`767`	`767`	`ret = ib_register_device(ib_dev, "hns_%d", dev);`
`768`	`768`	`if (ret) {`
`769`	`769`	`dev_err(dev, "ib_register_device failed!\n");`