linux-kernel - [PATCH 05/12] net: mana: Set the DMA device max page size

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Message-Id: <1652778276-2986-6-git-send-email-longli@linuxonhyperv.com>
Date:   Tue, 17 May 2022 02:04:29 -0700
From:   longli@...uxonhyperv.com
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Long Li <longli@...rosoft.com>
Subject: [PATCH 05/12] net: mana: Set the DMA device max page size

From: Long Li <longli@...rosoft.com>

The system chooses default 64K page size if the device does not specify
the max page size the device can handle for DMA. This do not work well
when device is registering large chunk of memory in that a large page size
is more efficient.

Set it to the maximum hardware supported page size.

Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 86ffe0e39df0..426087688480 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1385,6 +1385,13 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		goto release_region;
 
+	// The max GDMA HW supported page size is 2M
+	err = dma_set_max_seg_size(&pdev->dev, SZ_2M);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to set dma device segment size\n");
+		goto release_region;
+	}
+
 	err = -ENOMEM;
 	gc = vzalloc(sizeof(*gc));
 	if (!gc)
-- 
2.17.1