Re: [PATCH 10/11] vfio: selftests: Add mlx5 driver - data path and memcpy ops
From: David Matlack <dmatlack@google.com>
Date: 2026-05-04 22:41:13
Also in:
kvm, linux-kselftest, linux-patches, linux-rdma
On 2026-04-30 09:08 PM, Jason Gunthorpe wrote:
quoted hunk ↗ jump to hunk
@@ -1368,6 +1716,11 @@ static void mlx5st_init(struct vfio_pci_device *device) mlx5st_alloc_pd(dev); mlx5st_create_mkey(dev); + mlx5st_setup_datapath(dev); + + device->driver.max_memcpy_size = 1 << 20; + device->driver.max_memcpy_count = SQ_WQE_CNT - 1;
What are these limits a function of? e.g. Is the 1MB size a hardware limit? Can we change SQ_WQE_CNT in the future to increase max count? I'm interested in this because for Live Update testing we've found it valuable to keep the device busy for several minutes so that it can do DMA continuously throughout the Live Update.
+ dev_dbg(device, "mlx5 driver initialized\n"); }