linux-kernel - [PATCH V2 net 2/9] net: hns3: add sync command to sync io-pgtable

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Message-ID: <20241018101059.1718375-3-shaojijie@huawei.com>
Date: Fri, 18 Oct 2024 18:10:52 +0800
From: Jijie Shao <shaojijie@...wei.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <shenjian15@...wei.com>, <salil.mehta@...wei.com>
CC: <liuyonglong@...wei.com>, <wangpeiyang1@...wei.com>,
	<shaojijie@...wei.com>, <lanhao@...wei.com>, <chenhao418@...wei.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 net 2/9] net: hns3: add sync command to sync io-pgtable

From: Jian Shen <shenjian15@...wei.com>

To avoid errors in pgtable prefectch, add a sync command to sync
io-pagtable.

In the case of large traffic, the TX bounce buffer may be used up.
At this point, we go to mapping/unmapping on TX path again.
So we added the sync command in driver to avoid hardware issue.

Signed-off-by: Jian Shen <shenjian15@...wei.com>
Signed-off-by: Peiyang Wang <wangpeiyang1@...wei.com>
Signed-off-by: Jijie Shao <shaojijie@...wei.com>
---
 .../net/ethernet/hisilicon/hns3/hns3_enet.c   | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index ac88e301f221..8760b4e9ade6 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -381,6 +381,24 @@ static const struct hns3_rx_ptype hns3_rx_ptype_tbl[] = {
 #define HNS3_INVALID_PTYPE \
 		ARRAY_SIZE(hns3_rx_ptype_tbl)
 
+static void hns3_dma_map_sync(struct device *dev, unsigned long iova)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+	struct iommu_iotlb_gather iotlb_gather;
+	size_t granule;
+
+	if (!domain || !iommu_is_dma_domain(domain))
+		return;
+
+	granule = 1 << __ffs(domain->pgsize_bitmap);
+	iova = ALIGN_DOWN(iova, granule);
+	iotlb_gather.start = iova;
+	iotlb_gather.end = iova + granule - 1;
+	iotlb_gather.pgsize = granule;
+
+	iommu_iotlb_sync(domain, &iotlb_gather);
+}
+
 static irqreturn_t hns3_irq_handle(int irq, void *vector)
 {
 	struct hns3_enet_tqp_vector *tqp_vector = vector;
@@ -1728,7 +1746,9 @@ static int hns3_map_and_fill_desc(struct hns3_enet_ring *ring, void *priv,
 				  unsigned int type)
 {
 	struct hns3_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_use];
+	struct hnae3_handle *handle = ring->tqp->handle;
 	struct device *dev = ring_to_dev(ring);
+	struct hnae3_ae_dev *ae_dev;
 	unsigned int size;
 	dma_addr_t dma;
 
@@ -1760,6 +1780,13 @@ static int hns3_map_and_fill_desc(struct hns3_enet_ring *ring, void *priv,
 		return -ENOMEM;
 	}
 
+	/* Add a SYNC command to sync io-pgtale to avoid errors in pgtable
+	 * prefetch
+	 */
+	ae_dev = hns3_get_ae_dev(handle);
+	if (ae_dev->dev_version >= HNAE3_DEVICE_VERSION_V3)
+		hns3_dma_map_sync(dev, dma);
+
 	desc_cb->priv = priv;
 	desc_cb->length = size;
 	desc_cb->dma = dma;
-- 
2.33.0