[PATCH 2/6] uio_hv_generic: Query the ringbuffer size for device

Saurabh Sengar
2024-02-17T18:04:33Z

Query the ring buffer size from pre defined table per device.
Keep the size as is if the device doesn't have any preferred
ring size.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
drivers/uio/uio_hv_generic.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 20d9762331bd..4bda6b52e49e 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -238,6 +238,7 @@ hv_uio_probe(struct hv_device *dev,
struct hv_uio_private_data *pdata;
void *ring_buffer;
int ret;
+ size_t ring_size = hv_dev_ring_size(channel);

/* Communicating with host has to be via shared memory not hypercall */
if (!channel->offermsg.monitor_allocated) {
@@ -245,12 +246,14 @@ hv_uio_probe(struct hv_device *dev,
return -ENOTSUPP;
}

+ if (!ring_size)
+ ring_size = HV_RING_SIZE * PAGE_SIZE;
+
pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;

- ret = vmbus_alloc_ring(channel, HV_RING_SIZE * PAGE_SIZE,
- HV_RING_SIZE * PAGE_SIZE);
+ ret = vmbus_alloc_ring(channel, ring_size, ring_size);
if (ret)
return ret;

--
2.34.1