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authorHaiyang Zhang <haiyangz@microsoft.com>2017-12-11 08:56:57 -0800
committerDavid S. Miller <davem@davemloft.net>2017-12-13 13:25:04 -0500
commit11b2b653102571ac791885324371d9a1a17b900e (patch)
treebb02a198e68bd6e6042af7b62bc3194ab7fa1ad1 /drivers
parentf93ea3bf151daea735a3dd6bb8c3d386ee2ebac3 (diff)
downloadlinux-11b2b653102571ac791885324371d9a1a17b900e.tar.bz2
hv_netvsc: Fix the receive buffer size limit
The max should be 31 MB on host with NVSP version > 2. On legacy hosts (NVSP version <=2) only 15 MB receive buffer is allowed, otherwise the buffer request will be rejected by the host, resulting vNIC not coming up. The NVSP version is only available after negotiation. So, we add the limit checking for legacy hosts in netvsc_init_buf(). Fixes: 5023a6db73196 ("netvsc: increase default receive buffer size") Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/hyperv/hyperv_net.h6
-rw-r--r--drivers/net/hyperv/netvsc.c5
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 3d940c67ea94..373455f216ce 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -637,9 +637,11 @@ struct nvsp_message {
#define NETVSC_MTU 65535
#define NETVSC_MTU_MIN ETH_MIN_MTU
-#define NETVSC_RECEIVE_BUFFER_SIZE (1024*1024*16) /* 16MB */
-#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024*1024*15) /* 15MB */
+/* Max buffer sizes allowed by a host */
+#define NETVSC_RECEIVE_BUFFER_SIZE (1024 * 1024 * 31) /* 31MB */
+#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024 * 1024 * 15) /* 15MB */
#define NETVSC_SEND_BUFFER_SIZE (1024 * 1024 * 15) /* 15MB */
+
#define NETVSC_INVALID_INDEX -1
#define NETVSC_SEND_SECTION_SIZE 6144
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,