linux-kernel - [Patch v7 04/12] net: mana: Set the DMA device max segment size

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Message-Id: <1666034441-15424-5-git-send-email-longli@linuxonhyperv.com>
Date:   Mon, 17 Oct 2022 12:20:33 -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>, edumazet@...gle.com,
        shiraz.saleem@...el.com, Ajay Sharma <sharmaajay@...rosoft.com>
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 v7 04/12] net: mana: Set the DMA device max segment size

From: Ajay Sharma <sharmaajay@...rosoft.com>

MANA hardware doesn't have any restrictions on the DMA segment size, set it
to the max allowed value.

Signed-off-by: Ajay Sharma <sharmaajay@...rosoft.com>
Reviewed-by: Dexuan Cui <decui@...rosoft.com>
Signed-off-by: Long Li <longli@...rosoft.com>
Acked-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
Change log:
v2: Use the max allowed value as the hardware doesn't have any limit

 drivers/net/ethernet/microsoft/mana/gdma_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 0cfe5f15458e..4f041b27c07d 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1363,6 +1363,12 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		goto release_region;
 
+	err = dma_set_max_seg_size(&pdev->dev, UINT_MAX);
+	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