Re: [PATCH net 1/1] hv_netvsc: Calculate correct ring size when PAGE_SIZE is not 4 Kbytes

On Mon, Jan 22, 2024 at 08:20:28AM -0800, mhkelley58@gmail.com wrote:

From: Michael Kelley <redacted>

Current code in netvsc_drv_init() incorrectly assumes that PAGE_SIZE
is 4 Kbytes, which is wrong on ARM64 with 16K or 64K page size. As a
result, the default VMBus ring buffer size on ARM64 with 64K page size
is 8 Mbytes instead of the expected 512 Kbytes. While this doesn't break
anything, a typical VM with 8 vCPUs and 8 netvsc channels wastes 120
Mbytes (8 channels * 2 ring buffers/channel * 7.5 Mbytes/ring buffer).

Unfortunately, the module parameter specifying the ring buffer size
is in units of 4 Kbyte pages. Ideally, it should be in units that
are independent of PAGE_SIZE, but backwards compatibility prevents
changing that now.

Fix this by having netvsc_drv_init() hardcode 4096 instead of using
PAGE_SIZE when calculating the ring buffer size in bytes. Also
use the VMBUS_RING_SIZE macro to ensure proper alignment when running
with page size larger than 4K.

Cc: <redacted> # 5.15.x
Signed-off-by: Michael Kelley <redacted>

Hi Michael,

As a bug fix this probably warrants a fixes tag.
Perhaps this is appropriate?

Fixes: 450d7a4b7ace ("Staging: hv: ring parameter")

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