From: Firo Yang <firo.y...@suse.com> Date: Tue, 6 Aug 2019 09:29:51 +0000
> In Xen environment, if Xen-swiotlb is enabled, ixgbe driver > could possibly allocate a page, DMA memory buffer, for the first > fragment which is not suitable for Xen-swiotlb to do DMA operations. > Xen-swiotlb will internally allocate another page for doing DMA > operations. It requires syncing between those two pages. Otherwise, > we may get an incomplete skb. To fix this problem, sync the first > fragment no matter the first fargment is makred as "page_released" > or not. > > Signed-off-by: Firo Yang <firo.y...@suse.com> I don't understand, an unmap operation implies a sync operation.
