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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
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