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Date: Sat, 28 Apr 2018 11:23:34 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: kbuild@...org, Sridhar Samudrala <sridhar.samudrala@...el.com>
Cc: kbuild-all@...org, mst@...hat.com, stephen@...workplumber.org,
davem@...emloft.net, netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
virtio-dev@...ts.oasis-open.org, jesse.brandeburg@...el.com,
alexander.h.duyck@...el.com, kubakici@...pl,
sridhar.samudrala@...el.com, jasowang@...hat.com,
loseweigh@...il.com, jiri@...nulli.us, aaron.f.brown@...el.com
Subject: Re: [PATCH net-next v8 2/4] net: Introduce generic failover module
Hi Sridhar,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Sridhar-Samudrala/Enable-virtio_net-to-act-as-a-standby-for-a-passthru-device/20180427-183842
smatch warnings:
net/core/net_failover.c:229 net_failover_change_mtu() error: we previously assumed 'primary_dev' could be null (see line 219)
net/core/net_failover.c:279 net_failover_vlan_rx_add_vid() error: we previously assumed 'primary_dev' could be null (see line 269)
# https://github.com/0day-ci/linux/commit/5a5f2e3efcb699867db79543dfebe764927b9c93
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 5a5f2e3efcb699867db79543dfebe764927b9c93
vim +/primary_dev +229 net/core/net_failover.c
5a5f2e3e Sridhar Samudrala 2018-04-25 211
5a5f2e3e Sridhar Samudrala 2018-04-25 212 static int net_failover_change_mtu(struct net_device *dev, int new_mtu)
5a5f2e3e Sridhar Samudrala 2018-04-25 213 {
5a5f2e3e Sridhar Samudrala 2018-04-25 214 struct net_failover_info *nfo_info = netdev_priv(dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 215 struct net_device *primary_dev, *standby_dev;
5a5f2e3e Sridhar Samudrala 2018-04-25 216 int ret = 0;
5a5f2e3e Sridhar Samudrala 2018-04-25 217
5a5f2e3e Sridhar Samudrala 2018-04-25 218 primary_dev = rcu_dereference(nfo_info->primary_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 @219 if (primary_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 220 ret = dev_set_mtu(primary_dev, new_mtu);
5a5f2e3e Sridhar Samudrala 2018-04-25 221 if (ret)
5a5f2e3e Sridhar Samudrala 2018-04-25 222 return ret;
5a5f2e3e Sridhar Samudrala 2018-04-25 223 }
5a5f2e3e Sridhar Samudrala 2018-04-25 224
5a5f2e3e Sridhar Samudrala 2018-04-25 225 standby_dev = rcu_dereference(nfo_info->standby_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 226 if (standby_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 227 ret = dev_set_mtu(standby_dev, new_mtu);
5a5f2e3e Sridhar Samudrala 2018-04-25 228 if (ret) {
5a5f2e3e Sridhar Samudrala 2018-04-25 @229 dev_set_mtu(primary_dev, dev->mtu);
5a5f2e3e Sridhar Samudrala 2018-04-25 230 return ret;
5a5f2e3e Sridhar Samudrala 2018-04-25 231 }
5a5f2e3e Sridhar Samudrala 2018-04-25 232 }
5a5f2e3e Sridhar Samudrala 2018-04-25 233
5a5f2e3e Sridhar Samudrala 2018-04-25 234 dev->mtu = new_mtu;
5a5f2e3e Sridhar Samudrala 2018-04-25 235
5a5f2e3e Sridhar Samudrala 2018-04-25 236 return 0;
5a5f2e3e Sridhar Samudrala 2018-04-25 237 }
5a5f2e3e Sridhar Samudrala 2018-04-25 238
5a5f2e3e Sridhar Samudrala 2018-04-25 239 static void net_failover_set_rx_mode(struct net_device *dev)
5a5f2e3e Sridhar Samudrala 2018-04-25 240 {
5a5f2e3e Sridhar Samudrala 2018-04-25 241 struct net_failover_info *nfo_info = netdev_priv(dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 242 struct net_device *slave_dev;
5a5f2e3e Sridhar Samudrala 2018-04-25 243
5a5f2e3e Sridhar Samudrala 2018-04-25 244 rcu_read_lock();
5a5f2e3e Sridhar Samudrala 2018-04-25 245
5a5f2e3e Sridhar Samudrala 2018-04-25 246 slave_dev = rcu_dereference(nfo_info->primary_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 247 if (slave_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 248 dev_uc_sync_multiple(slave_dev, dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 249 dev_mc_sync_multiple(slave_dev, dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 250 }
5a5f2e3e Sridhar Samudrala 2018-04-25 251
5a5f2e3e Sridhar Samudrala 2018-04-25 252 slave_dev = rcu_dereference(nfo_info->standby_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 253 if (slave_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 254 dev_uc_sync_multiple(slave_dev, dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 255 dev_mc_sync_multiple(slave_dev, dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 256 }
5a5f2e3e Sridhar Samudrala 2018-04-25 257
5a5f2e3e Sridhar Samudrala 2018-04-25 258 rcu_read_unlock();
5a5f2e3e Sridhar Samudrala 2018-04-25 259 }
5a5f2e3e Sridhar Samudrala 2018-04-25 260
5a5f2e3e Sridhar Samudrala 2018-04-25 261 static int net_failover_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
5a5f2e3e Sridhar Samudrala 2018-04-25 262 u16 vid)
5a5f2e3e Sridhar Samudrala 2018-04-25 263 {
5a5f2e3e Sridhar Samudrala 2018-04-25 264 struct net_failover_info *nfo_info = netdev_priv(dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 265 struct net_device *primary_dev, *standby_dev;
5a5f2e3e Sridhar Samudrala 2018-04-25 266 int ret = 0;
5a5f2e3e Sridhar Samudrala 2018-04-25 267
5a5f2e3e Sridhar Samudrala 2018-04-25 268 primary_dev = rcu_dereference(nfo_info->primary_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 @269 if (primary_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 270 ret = vlan_vid_add(primary_dev, proto, vid);
5a5f2e3e Sridhar Samudrala 2018-04-25 271 if (ret)
5a5f2e3e Sridhar Samudrala 2018-04-25 272 return ret;
5a5f2e3e Sridhar Samudrala 2018-04-25 273 }
5a5f2e3e Sridhar Samudrala 2018-04-25 274
5a5f2e3e Sridhar Samudrala 2018-04-25 275 standby_dev = rcu_dereference(nfo_info->standby_dev);
5a5f2e3e Sridhar Samudrala 2018-04-25 276 if (standby_dev) {
5a5f2e3e Sridhar Samudrala 2018-04-25 277 ret = vlan_vid_add(standby_dev, proto, vid);
5a5f2e3e Sridhar Samudrala 2018-04-25 278 if (ret)
5a5f2e3e Sridhar Samudrala 2018-04-25 @279 vlan_vid_del(primary_dev, proto, vid);
5a5f2e3e Sridhar Samudrala 2018-04-25 280 }
5a5f2e3e Sridhar Samudrala 2018-04-25 281
5a5f2e3e Sridhar Samudrala 2018-04-25 282 return ret;
5a5f2e3e Sridhar Samudrala 2018-04-25 283 }
5a5f2e3e Sridhar Samudrala 2018-04-25 284
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