From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Legacy hosts only allow 15 MB receive buffer, and we know the
NVSP version only after negotiation. So, we put the limit in
netvsc_init_buf().
Fixes: 5023a6db73196 ("netvsc: increase default receive buffer size")
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
---
drivers/net/hyperv/netvsc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index e4bcd202a56a..e5d16a8cf0d6 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -268,6 +268,11 @@ static int netvsc_init_buf(struct hv_device *device,
buf_size = device_info->recv_sections * device_info->recv_section_size;
buf_size = roundup(buf_size, PAGE_SIZE);
+ /* Legacy hosts only allow smaller receive buffer */
+ if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
+ buf_size = min_t(unsigned int, buf_size,
+ NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
+
net_device->recv_buf = vzalloc(buf_size);
if (!net_device->recv_buf) {
netdev_err(ndev,
--
2.11.0
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