在 2023/10/28 5:46, Bart Van Assche 写道:
On 10/27/23 01:17, Zhu Yanjun wrote:
When ULP uses folio or compound page, ULP can not work well with RXE
after this commit is applied.
Isn't it the responsibility of the DMA mapping code to build an sg-list
for folios? Drivers like ib_srp see an sg-list, whether that comes from
A folio is a way of representing a set of physically contiguous base
pages. In current implementations of folio, it seems that sg-list is not
used.
In Folio, some huge pages whose size is not PAGE_SIZE is dma-mapped into
hardware.
So the page size of folio is not equal to PAGE_SIZE. If this commit is
applied, it causes potential risks to the future folio.
I have developed some folio work for some NIC and RDMA drivers. In
Folio, the page size of Folio is possibly not equal to PAGE_SIZE, it is
multiple PAGE_SIZE. And when folio is dma-mapped to HW, the page size is
equal to multiple PAGE_SIZE.
In this case, ULP with folio will not work well with current RXE after
this commit is applied.
Removing page_size in RXE seems a plan for this problem.
Zhu Yanjun
a folio or from something else.
Bart.
