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Date: Wed, 26 Jul 2017 16:40:21 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
corbet@....net
Cc: devel@...uxdriverproject.org, linux-doc@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH net-next v2 02/10] netvsc: fix warnings reported by lockdep
This includes a bunch of fixups for issues reported by
lockdep.
* ethtool routines can assume RTNL
* send is done with RCU lock (and BH disable)
* avoid refetching internal device struct (netvsc)
instead pass it as a parameter.
Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
---
drivers/net/hyperv/hyperv_net.h | 3 +-
drivers/net/hyperv/netvsc.c | 2 +-
drivers/net/hyperv/netvsc_drv.c | 15 ++++---
drivers/net/hyperv/rndis_filter.c | 84 +++++++++++++++++++--------------------
4 files changed, 54 insertions(+), 50 deletions(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 4e7ff348327e..fb62ea632914 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -217,7 +217,8 @@ int rndis_filter_receive(struct net_device *ndev,
struct vmbus_channel *channel,
void *data, u32 buflen);
-int rndis_filter_set_device_mac(struct net_device *ndev, char *mac);
+int rndis_filter_set_device_mac(struct netvsc_device *ndev,
+ const char *mac);
void netvsc_switch_datapath(struct net_device *nv_dev, bool vf);
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 06f39a99da7c..94c00acac58a 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -832,7 +832,7 @@ int netvsc_send(struct net_device_context *ndev_ctx,
struct sk_buff *skb)
{
struct netvsc_device *net_device
- = rcu_dereference_rtnl(ndev_ctx->nvdev);
+ = rcu_dereference_bh(ndev_ctx->nvdev);
struct hv_device *device = ndev_ctx->device_ctx;
int ret = 0;
struct netvsc_channel *nvchan;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index f1eaf675d2e9..a04f2efbbc25 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -923,6 +923,8 @@ static void netvsc_get_stats64(struct net_device *net,
static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
{
+ struct net_device_context *ndc = netdev_priv(ndev);
+ struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
struct sockaddr *addr = p;
char save_adr[ETH_ALEN];
unsigned char save_aatype;
@@ -935,7 +937,10 @@ static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
if (err != 0)
return err;
- err = rndis_filter_set_device_mac(ndev, addr->sa_data);
+ if (!nvdev)
+ return -ENODEV;
+
+ err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
if (err != 0) {
/* roll back to saved MAC */
memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
@@ -981,7 +986,7 @@ static void netvsc_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
struct net_device_context *ndc = netdev_priv(dev);
- struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev);
+ struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
const void *nds = &ndc->eth_stats;
const struct netvsc_stats *qstats;
unsigned int start;
@@ -1019,7 +1024,7 @@ static void netvsc_get_ethtool_stats(struct net_device *dev,
static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
struct net_device_context *ndc = netdev_priv(dev);
- struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev);
+ struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
u8 *p = data;
int i;
@@ -1077,7 +1082,7 @@ netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
u32 *rules)
{
struct net_device_context *ndc = netdev_priv(dev);
- struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev);
+ struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
if (!nvdev)
return -ENODEV;
@@ -1127,7 +1132,7 @@ static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
u8 *hfunc)
{
struct net_device_context *ndc = netdev_priv(dev);
- struct netvsc_device *ndev = rcu_dereference(ndc->nvdev);
+ struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
struct rndis_device *rndis_dev;
int i;
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index eaa3f0d5682a..bf21ea92c743 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -85,14 +85,6 @@ static struct rndis_device *get_rndis_device(void)
return device;
}
-static struct netvsc_device *
-net_device_to_netvsc_device(struct net_device *ndev)
-{
- struct net_device_context *net_device_ctx = netdev_priv(ndev);
-
- return rtnl_dereference(net_device_ctx->nvdev);
-}
-
static struct rndis_request *get_rndis_request(struct rndis_device *dev,
u32 msg_type,
u32 msg_len)
@@ -252,7 +244,10 @@ static int rndis_filter_send_request(struct rndis_device *dev,
pb[0].len;
}
+ rcu_read_lock_bh();
ret = netvsc_send(net_device_ctx, packet, NULL, &pb, NULL);
+ rcu_read_unlock_bh();
+
return ret;
}
@@ -452,8 +447,9 @@ int rndis_filter_receive(struct net_device *ndev,
return 0;
}
-static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
- void *result, u32 *result_size)
+static int rndis_filter_query_device(struct rndis_device *dev,
+ struct netvsc_device *nvdev,
+ u32 oid, void *result, u32 *result_size)
{
struct rndis_request *request;
u32 inresult_size = *result_size;
@@ -480,8 +476,6 @@ static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
query->dev_vc_handle = 0;
if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
- struct net_device_context *ndevctx = netdev_priv(dev->ndev);
- struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
struct ndis_offload *hwcaps;
u32 nvsp_version = nvdev->nvsp_version;
u8 ndis_rev;
@@ -550,14 +544,15 @@ static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
/* Get the hardware offload capabilities */
static int
-rndis_query_hwcaps(struct rndis_device *dev, struct ndis_offload *caps)
+rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
+ struct ndis_offload *caps)
{
u32 caps_len = sizeof(*caps);
int ret;
memset(caps, 0, sizeof(*caps));
- ret = rndis_filter_query_device(dev,
+ ret = rndis_filter_query_device(dev, net_device,
OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
caps, &caps_len);
if (ret)
@@ -586,11 +581,12 @@ rndis_query_hwcaps(struct rndis_device *dev, struct ndis_offload *caps)
return 0;
}
-static int rndis_filter_query_device_mac(struct rndis_device *dev)
+static int rndis_filter_query_device_mac(struct rndis_device *dev,
+ struct netvsc_device *net_device)
{
u32 size = ETH_ALEN;
- return rndis_filter_query_device(dev,
+ return rndis_filter_query_device(dev, net_device,
RNDIS_OID_802_3_PERMANENT_ADDRESS,
dev->hw_mac_adr, &size);
}
@@ -598,9 +594,9 @@ static int rndis_filter_query_device_mac(struct rndis_device *dev)
#define NWADR_STR "NetworkAddress"
#define NWADR_STRLEN 14
-int rndis_filter_set_device_mac(struct net_device *ndev, char *mac)
+int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
+ const char *mac)
{
- struct netvsc_device *nvdev = net_device_to_netvsc_device(ndev);
struct rndis_device *rdev = nvdev->extension;
struct rndis_request *request;
struct rndis_set_request *set;
@@ -654,11 +650,8 @@ int rndis_filter_set_device_mac(struct net_device *ndev, char *mac)
wait_for_completion(&request->wait_event);
set_complete = &request->response_msg.msg.set_complete;
- if (set_complete->status != RNDIS_STATUS_SUCCESS) {
- netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
- set_complete->status);
- ret = -EINVAL;
- }
+ if (set_complete->status != RNDIS_STATUS_SUCCESS)
+ ret = -EIO;
cleanup:
put_rndis_request(rdev, request);
@@ -791,27 +784,27 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,
return ret;
}
-static int rndis_filter_query_device_link_status(struct rndis_device *dev)
+static int rndis_filter_query_device_link_status(struct rndis_device *dev,
+ struct netvsc_device *net_device)
{
u32 size = sizeof(u32);
u32 link_status;
- int ret;
- ret = rndis_filter_query_device(dev,
- RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
- &link_status, &size);
-
- return ret;
+ return rndis_filter_query_device(dev, net_device,
+ RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
+ &link_status, &size);
}
-static int rndis_filter_query_link_speed(struct rndis_device *dev)
+static int rndis_filter_query_link_speed(struct rndis_device *dev,
+ struct netvsc_device *net_device)
{
u32 size = sizeof(u32);
u32 link_speed;
struct net_device_context *ndc;
int ret;
- ret = rndis_filter_query_device(dev, RNDIS_OID_GEN_LINK_SPEED,
+ ret = rndis_filter_query_device(dev, net_device,
+ RNDIS_OID_GEN_LINK_SPEED,
&link_speed, &size);
if (!ret) {
@@ -880,14 +873,14 @@ void rndis_filter_update(struct netvsc_device *nvdev)
schedule_work(&rdev->mcast_work);
}
-static int rndis_filter_init_device(struct rndis_device *dev)
+static int rndis_filter_init_device(struct rndis_device *dev,
+ struct netvsc_device *nvdev)
{
struct rndis_request *request;
struct rndis_initialize_request *init;
struct rndis_initialize_complete *init_complete;
u32 status;
int ret;
- struct netvsc_device *nvdev = net_device_to_netvsc_device(dev->ndev);
request = get_rndis_request(dev, RNDIS_MSG_INIT,
RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
@@ -1024,12 +1017,17 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc)
{
struct net_device *ndev =
hv_get_drvdata(new_sc->primary_channel->device_obj);
- struct netvsc_device *nvscdev = net_device_to_netvsc_device(ndev);
+ struct net_device_context *ndev_ctx = netdev_priv(ndev);
+ struct netvsc_device *nvscdev;
u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
struct netvsc_channel *nvchan;
int ret;
- if (chn_index >= nvscdev->num_chn)
+ /* This is safe because this callback only happens when
+ * new device is being setup and waiting on the channel_init_wait.
+ */
+ nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
+ if (!nvscdev || chn_index >= nvscdev->num_chn)
return;
nvchan = nvscdev->chan_table + chn_index;
@@ -1104,27 +1102,27 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
rndis_device->ndev = net;
/* Send the rndis initialization message */
- ret = rndis_filter_init_device(rndis_device);
+ ret = rndis_filter_init_device(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
/* Get the MTU from the host */
size = sizeof(u32);
- ret = rndis_filter_query_device(rndis_device,
+ ret = rndis_filter_query_device(rndis_device, net_device,
RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
&mtu, &size);
if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
net->mtu = mtu;
/* Get the mac address */
- ret = rndis_filter_query_device_mac(rndis_device);
+ ret = rndis_filter_query_device_mac(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
/* Find HW offload capabilities */
- ret = rndis_query_hwcaps(rndis_device, &hwcaps);
+ ret = rndis_query_hwcaps(rndis_device, net_device, &hwcaps);
if (ret != 0)
goto err_dev_remv;
@@ -1185,7 +1183,7 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
if (ret)
goto err_dev_remv;
- rndis_filter_query_device_link_status(rndis_device);
+ rndis_filter_query_device_link_status(rndis_device, net_device);
netdev_dbg(net, "Device MAC %pM link state %s\n",
rndis_device->hw_mac_adr,
@@ -1194,11 +1192,11 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
return net_device;
- rndis_filter_query_link_speed(rndis_device);
+ rndis_filter_query_link_speed(rndis_device, net_device);
/* vRSS setup */
memset(&rsscap, 0, rsscap_size);
- ret = rndis_filter_query_device(rndis_device,
+ ret = rndis_filter_query_device(rndis_device, net_device,
OID_GEN_RECEIVE_SCALE_CAPABILITIES,
&rsscap, &rsscap_size);
if (ret || rsscap.num_recv_que < 2)
--
2.11.0
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