[net,0/1] s390/ism: Fix splice for SMC-D

Message

Gerd Bayer March 28, 2024, 3:41 p.m. UTC

Hi all,

due to a change in the DMA API - to no longer provide compound
pages with dma_alloc_coherent - splice broke for the SMC-D protocol.
Here, I'm proposing a fix for that.

I'm aware that this is a rather coarse fix attempt and a proper
solution would be to rework the	SMC-D protocol to drop the requirement
for compound pages. That work might take some more time.

Meanwhile, I'd like to probe if this change in how DMA buffers for ISM
devices get allocated is acceptable as an interim solution.

With this change applied on top of current master, our test-cases for
SMC-D splice complete successfully again.

Gerd Bayer (1):
  s390/ism: fix receive message buffer allocation

 drivers/s390/net/ism_drv.c | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)