From cfe355c56e3a5eb993fd4ea807b60f34f91b0cde Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Wed, 29 Dec 2021 16:09:38 +0800 Subject: [PATCH] Bonding: return HWTSTAMP_FLAG_BONDED_PHC_INDEX to notify user space If the userspace program is distributed in binary form (distro package), there is no way to know on which kernel versions it will run. Let's only check if the flag was set when do SIOCSHWTSTAMP. And return hwtstamp_config with flag HWTSTAMP_FLAG_BONDED_PHC_INDEX to notify userspace whether the new feature is supported or not. Suggested-by: Jakub Kicinski Fixes: 085d61000845 ("Bonding: force user to add HWTSTAMP_FLAG_BONDED_PHC_INDEX when get/set HWTSTAMP") Signed-off-by: Hangbin Liu Acked-by: Richard Cochran Signed-off-by: Jakub Kicinski --- drivers/net/bonding/bond_main.c | 42 ++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 16 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index b60e22f6394a..1bb8fa9fd3aa 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4124,28 +4124,38 @@ static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cm break; case SIOCSHWTSTAMP: - case SIOCGHWTSTAMP: if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) return -EFAULT; - if (cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX) { - rcu_read_lock(); - real_dev = bond_option_active_slave_get_rcu(bond); - rcu_read_unlock(); - if (real_dev) { - strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); - ifrr.ifr_ifru = ifr->ifr_ifru; + if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) + return -EOPNOTSUPP; - ops = real_dev->netdev_ops; - if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { - res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); + fallthrough; + case SIOCGHWTSTAMP: + rcu_read_lock(); + real_dev = bond_option_active_slave_get_rcu(bond); + rcu_read_unlock(); + if (!real_dev) + return -EOPNOTSUPP; - if (!res) - ifr->ifr_ifru = ifrr.ifr_ifru; + strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); + ifrr.ifr_ifru = ifr->ifr_ifru; - return res; - } - } + ops = real_dev->netdev_ops; + if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { + res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); + if (res) + return res; + + ifr->ifr_ifru = ifrr.ifr_ifru; + if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) + return -EFAULT; + + /* Set the BOND_PHC_INDEX flag to notify user space */ + cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; + + return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? + -EFAULT : 0; } fallthrough; default: -- GitLab