| Message ID | 20210615094517.48752-8-yangbo.lu@nxp.com |
|---|---|
| State | New |
| Headers | show |
| Series | ptp: support virtual clocks and timestamping | expand |
On Tue, 15 Jun 2021, Yangbo Lu wrote: > Since PTP virtual clock support is added, there can be > several PTP virtual clocks based on one PTP physical > clock for timestamping. > > This patch is to extend SO_TIMESTAMPING API to support > PHC (PTP Hardware Clock) binding by adding a new flag > SOF_TIMESTAMPING_BIND_PHC. When PTP virtual clocks are > in use, user space can configure to bind one for > timestamping, but PTP physical clock is not supported > and not needed to bind. > > This patch is preparation for timestamp conversion from > raw timestamp to a specific PTP virtual clock time in > core net. > > Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> > --- > Changes for v3: > - Added this patch. > --- > include/net/sock.h | 8 +++- > include/uapi/linux/net_tstamp.h | 17 ++++++++- > net/core/sock.c | 65 +++++++++++++++++++++++++++++++-- > net/ethtool/common.c | 1 + > net/mptcp/sockopt.c | 10 +++-- > 5 files changed, 91 insertions(+), 10 deletions(-) > > diff --git a/include/net/sock.h b/include/net/sock.h > index 9b341c2c924f..adb6c0edc867 100644 > --- a/include/net/sock.h > +++ b/include/net/sock.h > @@ -316,7 +316,9 @@ struct bpf_local_storage; > * @sk_timer: sock cleanup timer > * @sk_stamp: time stamp of last packet received > * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only > - * @sk_tsflags: SO_TIMESTAMPING socket options > + * @sk_tsflags: SO_TIMESTAMPING flags > + * @sk_bind_phc: SO_TIMESTAMPING bind PHC index of PTP virtual clock > + * for timestamping > * @sk_tskey: counter to disambiguate concurrent tstamp requests > * @sk_zckey: counter to order MSG_ZEROCOPY notifications > * @sk_socket: Identd and reporting IO signals > @@ -493,6 +495,7 @@ struct sock { > seqlock_t sk_stamp_seq; > #endif > u16 sk_tsflags; > + int sk_bind_phc; > u8 sk_shutdown; > u32 sk_tskey; > atomic_t sk_zckey; > @@ -2744,7 +2747,8 @@ void sock_def_readable(struct sock *sk); > > int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk); > void sock_set_timestamp(struct sock *sk, int optname, bool valbool); > -int sock_set_timestamping(struct sock *sk, int optname, int val); > +int sock_set_timestamping(struct sock *sk, int optname, int val, > + sockptr_t optval, unsigned int optlen); > > void sock_enable_timestamps(struct sock *sk); > void sock_no_linger(struct sock *sk); > diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h > index 7ed0b3d1c00a..9d4cde4ef7e6 100644 > --- a/include/uapi/linux/net_tstamp.h > +++ b/include/uapi/linux/net_tstamp.h > @@ -13,7 +13,7 @@ > #include <linux/types.h> > #include <linux/socket.h> /* for SO_TIMESTAMPING */ > > -/* SO_TIMESTAMPING gets an integer bit field comprised of these values */ > +/* SO_TIMESTAMPING flags */ > enum { > SOF_TIMESTAMPING_TX_HARDWARE = (1<<0), > SOF_TIMESTAMPING_TX_SOFTWARE = (1<<1), > @@ -30,8 +30,9 @@ enum { > SOF_TIMESTAMPING_OPT_STATS = (1<<12), > SOF_TIMESTAMPING_OPT_PKTINFO = (1<<13), > SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14), > + SOF_TIMESTAMPING_BIND_PHC = (1<<15), > > - SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_TX_SWHW, > + SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_BIND_PHC, > SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) | > SOF_TIMESTAMPING_LAST > }; > @@ -46,6 +47,18 @@ enum { > SOF_TIMESTAMPING_TX_SCHED | \ > SOF_TIMESTAMPING_TX_ACK) > > +/** > + * struct so_timestamping - SO_TIMESTAMPING parameter > + * > + * @flags: SO_TIMESTAMPING flags > + * @bind_phc: Index of PTP virtual clock bound to sock. This is available > + * if flag SOF_TIMESTAMPING_BIND_PHC is set. > + */ > +struct so_timestamping { > + int flags; > + int bind_phc; > +}; > + > /** > * struct hwtstamp_config - %SIOCGHWTSTAMP and %SIOCSHWTSTAMP parameter > * > diff --git a/net/core/sock.c b/net/core/sock.c > index ddfa88082a2b..70d2c2322429 100644 > --- a/net/core/sock.c > +++ b/net/core/sock.c > @@ -139,6 +139,8 @@ > #include <net/tcp.h> > #include <net/busy_poll.h> > > +#include <linux/ethtool.h> > + > static DEFINE_MUTEX(proto_list_mutex); > static LIST_HEAD(proto_list); > > @@ -794,8 +796,53 @@ void sock_set_timestamp(struct sock *sk, int optname, bool valbool) > } > } > > -int sock_set_timestamping(struct sock *sk, int optname, int val) > +static int sock_timestamping_bind_phc(struct sock *sk, int phc_index) > { > + struct ethtool_phc_vclocks phc_vclocks = { }; > + struct net *net = sock_net(sk); > + struct net_device *dev = NULL; > + bool match = false; > + int i; > + > + if (sk->sk_bound_dev_if) > + dev = dev_get_by_index(net, sk->sk_bound_dev_if); > + > + if (!dev) { > + pr_err("%s: sock not bind to device\n", __func__); > + return -EOPNOTSUPP; > + } > + > + ethtool_op_get_phc_vclocks(dev, &phc_vclocks); > + > + for (i = 0; i < phc_vclocks.num; i++) { > + if (phc_vclocks.index[i] == phc_index) { > + match = true; > + break; > + } > + } > + > + if (!match) > + return -EINVAL; > + > + sk->sk_bind_phc = phc_index; > + > + return 0; > +} > + > +int sock_set_timestamping(struct sock *sk, int optname, int val, > + sockptr_t optval, unsigned int optlen) > +{ > + struct so_timestamping timestamping; > + int ret; > + > + if (optlen == sizeof(timestamping)) { > + if (copy_from_sockptr(×tamping, optval, > + sizeof(timestamping))) > + return -EFAULT; > + > + val = timestamping.flags; > + } > + > if (val & ~SOF_TIMESTAMPING_MASK) > return -EINVAL; > > @@ -816,6 +863,15 @@ int sock_set_timestamping(struct sock *sk, int optname, int val) > !(val & SOF_TIMESTAMPING_OPT_TSONLY)) > return -EINVAL; > > + if (optlen == sizeof(timestamping) && > + val & SOF_TIMESTAMPING_BIND_PHC) { > + ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc); > + if (ret) > + return ret; > + } else { > + sk->sk_bind_phc = -1; > + } > + > sk->sk_tsflags = val; > sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW); > > @@ -1057,7 +1113,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname, > > case SO_TIMESTAMPING_NEW: > case SO_TIMESTAMPING_OLD: > - ret = sock_set_timestamping(sk, optname, val); > + ret = sock_set_timestamping(sk, optname, val, optval, optlen); > break; > > case SO_RCVLOWAT: > @@ -1332,6 +1388,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname, > struct __kernel_old_timeval tm; > struct __kernel_sock_timeval stm; > struct sock_txtime txtime; > + struct so_timestamping timestamping; > } v; > > int lv = sizeof(int); > @@ -1435,7 +1492,9 @@ int sock_getsockopt(struct socket *sock, int level, int optname, > break; > > case SO_TIMESTAMPING_OLD: > - v.val = sk->sk_tsflags; > + lv = sizeof(v.timestamping); > + v.timestamping.flags = sk->sk_tsflags; > + v.timestamping.bind_phc = sk->sk_bind_phc; > break; > > case SO_RCVTIMEO_OLD: > diff --git a/net/ethtool/common.c b/net/ethtool/common.c > index 14035f2dc6d4..4bf1bd3a3db6 100644 > --- a/net/ethtool/common.c > +++ b/net/ethtool/common.c > @@ -398,6 +398,7 @@ const char sof_timestamping_names[][ETH_GSTRING_LEN] = { > [const_ilog2(SOF_TIMESTAMPING_OPT_STATS)] = "option-stats", > [const_ilog2(SOF_TIMESTAMPING_OPT_PKTINFO)] = "option-pktinfo", > [const_ilog2(SOF_TIMESTAMPING_OPT_TX_SWHW)] = "option-tx-swhw", > + [const_ilog2(SOF_TIMESTAMPING_BIND_PHC)] = "bind-phc", > }; > static_assert(ARRAY_SIZE(sof_timestamping_names) == __SOF_TIMESTAMPING_CNT); > > diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c > index 092d1f635d27..2ca90b230827 100644 > --- a/net/mptcp/sockopt.c > +++ b/net/mptcp/sockopt.c > @@ -140,7 +140,10 @@ static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) > mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); > } > > -static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) > +static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, > + int optname, int val, > + sockptr_t optval, > + unsigned int optlen) > { > sockptr_t optval = KERNEL_SOCKPTR(&val); > struct mptcp_subflow_context *subflow; > @@ -166,7 +169,7 @@ static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam > break; > case SO_TIMESTAMPING_NEW: > case SO_TIMESTAMPING_OLD: > - sock_set_timestamping(sk, optname, val); > + sock_set_timestamping(sk, optname, val, optval, optlen); This is inside a loop, so in cases where optlen == sizeof(struct so_timestamping) this will end up re-copying the structure from userspace one extra time for each MPTCP subflow: once for the MPTCP socket, plus one time for each of the TCP subflows that are grouped under this MPTCP connection. Given that the extra copies only happen when using the extended bind_phc option, it's not a huge cost. But sock_set_timestamping() was written to avoid the extra copies for 'int' sized options, and if that was worth the effort then the larger so_timestamping structure could be copied (once) before the sock_set_timestamping() call and passed in. > break; > } > > @@ -207,7 +210,8 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, > case SO_TIMESTAMPNS_NEW: > case SO_TIMESTAMPING_OLD: > case SO_TIMESTAMPING_NEW: > - return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); > + return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val, > + optval, optlen); Rather than modifying mptcp_setsockopt_sol_socket_int(), I suggest adding a mptcp_setsockopt_sol_socket_timestamping() helper function that can handle the special copying for so_timestamping. > } > > return -ENOPROTOOPT; > -- > 2.25.1 > > -- Mat Martineau Intel
Hi Yangbo,
I love your patch! Yet something to improve:
[auto build test ERROR on 89212e160b81e778f829b89743570665810e3b13]
url: https://github.com/0day-ci/linux/commits/Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210616-141518
base: 89212e160b81e778f829b89743570665810e3b13
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/0day-ci/linux/commit/f03864a45f4fe97414824545398c837eead55409
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210616-141518
git checkout f03864a45f4fe97414824545398c837eead55409
# save the attached .config to linux build tree
make W=1 ARCH=um SUBARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
net/mptcp/sockopt.c: In function 'mptcp_setsockopt_sol_socket_tstamp':
>> net/mptcp/sockopt.c:148:12: error: 'optval' redeclared as different kind of symbol
148 | sockptr_t optval = KERNEL_SOCKPTR(&val);
| ^~~~~~
net/mptcp/sockopt.c:145:22: note: previous definition of 'optval' was here
145 | sockptr_t optval,
| ~~~~~~~~~~^~~~~~
vim +/optval +148 net/mptcp/sockopt.c
6f0d7198084c40 Florian Westphal 2021-04-15 142
f03864a45f4fe9 Yangbo Lu 2021-06-15 143 static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk,
f03864a45f4fe9 Yangbo Lu 2021-06-15 144 int optname, int val,
f03864a45f4fe9 Yangbo Lu 2021-06-15 145 sockptr_t optval,
f03864a45f4fe9 Yangbo Lu 2021-06-15 146 unsigned int optlen)
9061f24bf82ec2 Florian Westphal 2021-06-03 147 {
9061f24bf82ec2 Florian Westphal 2021-06-03 @148 sockptr_t optval = KERNEL_SOCKPTR(&val);
9061f24bf82ec2 Florian Westphal 2021-06-03 149 struct mptcp_subflow_context *subflow;
9061f24bf82ec2 Florian Westphal 2021-06-03 150 struct sock *sk = (struct sock *)msk;
9061f24bf82ec2 Florian Westphal 2021-06-03 151 int ret;
9061f24bf82ec2 Florian Westphal 2021-06-03 152
9061f24bf82ec2 Florian Westphal 2021-06-03 153 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
9061f24bf82ec2 Florian Westphal 2021-06-03 154 optval, sizeof(val));
9061f24bf82ec2 Florian Westphal 2021-06-03 155 if (ret)
9061f24bf82ec2 Florian Westphal 2021-06-03 156 return ret;
9061f24bf82ec2 Florian Westphal 2021-06-03 157
9061f24bf82ec2 Florian Westphal 2021-06-03 158 lock_sock(sk);
9061f24bf82ec2 Florian Westphal 2021-06-03 159 mptcp_for_each_subflow(msk, subflow) {
9061f24bf82ec2 Florian Westphal 2021-06-03 160 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
9061f24bf82ec2 Florian Westphal 2021-06-03 161 bool slow = lock_sock_fast(ssk);
9061f24bf82ec2 Florian Westphal 2021-06-03 162
9061f24bf82ec2 Florian Westphal 2021-06-03 163 switch (optname) {
9061f24bf82ec2 Florian Westphal 2021-06-03 164 case SO_TIMESTAMP_OLD:
9061f24bf82ec2 Florian Westphal 2021-06-03 165 case SO_TIMESTAMP_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 166 case SO_TIMESTAMPNS_OLD:
9061f24bf82ec2 Florian Westphal 2021-06-03 167 case SO_TIMESTAMPNS_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 168 sock_set_timestamp(sk, optname, !!val);
9061f24bf82ec2 Florian Westphal 2021-06-03 169 break;
9061f24bf82ec2 Florian Westphal 2021-06-03 170 case SO_TIMESTAMPING_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 171 case SO_TIMESTAMPING_OLD:
f03864a45f4fe9 Yangbo Lu 2021-06-15 172 sock_set_timestamping(sk, optname, val, optval, optlen);
9061f24bf82ec2 Florian Westphal 2021-06-03 173 break;
9061f24bf82ec2 Florian Westphal 2021-06-03 174 }
9061f24bf82ec2 Florian Westphal 2021-06-03 175
9061f24bf82ec2 Florian Westphal 2021-06-03 176 unlock_sock_fast(ssk, slow);
9061f24bf82ec2 Florian Westphal 2021-06-03 177 }
9061f24bf82ec2 Florian Westphal 2021-06-03 178
9061f24bf82ec2 Florian Westphal 2021-06-03 179 release_sock(sk);
9061f24bf82ec2 Florian Westphal 2021-06-03 180 return 0;
9061f24bf82ec2 Florian Westphal 2021-06-03 181 }
9061f24bf82ec2 Florian Westphal 2021-06-03 182
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Hi Yangbo,
I love your patch! Yet something to improve:
[auto build test ERROR on 89212e160b81e778f829b89743570665810e3b13]
url: https://github.com/0day-ci/linux/commits/Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210616-141518
base: 89212e160b81e778f829b89743570665810e3b13
config: arm-randconfig-r023-20210615 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/f03864a45f4fe97414824545398c837eead55409
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210616-141518
git checkout f03864a45f4fe97414824545398c837eead55409
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
net/mptcp/sockopt.c: In function 'mptcp_setsockopt_sol_socket_tstamp':
>> net/mptcp/sockopt.c:148:12: error: 'optval' redeclared as different kind of symbol
148 | sockptr_t optval = KERNEL_SOCKPTR(&val);
| ^~~~~~
net/mptcp/sockopt.c:145:22: note: previous definition of 'optval' was here
145 | sockptr_t optval,
| ~~~~~~~~~~^~~~~~
vim +/optval +148 net/mptcp/sockopt.c
6f0d7198084c40 Florian Westphal 2021-04-15 142
f03864a45f4fe9 Yangbo Lu 2021-06-15 143 static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk,
f03864a45f4fe9 Yangbo Lu 2021-06-15 144 int optname, int val,
f03864a45f4fe9 Yangbo Lu 2021-06-15 145 sockptr_t optval,
f03864a45f4fe9 Yangbo Lu 2021-06-15 146 unsigned int optlen)
9061f24bf82ec2 Florian Westphal 2021-06-03 147 {
9061f24bf82ec2 Florian Westphal 2021-06-03 @148 sockptr_t optval = KERNEL_SOCKPTR(&val);
9061f24bf82ec2 Florian Westphal 2021-06-03 149 struct mptcp_subflow_context *subflow;
9061f24bf82ec2 Florian Westphal 2021-06-03 150 struct sock *sk = (struct sock *)msk;
9061f24bf82ec2 Florian Westphal 2021-06-03 151 int ret;
9061f24bf82ec2 Florian Westphal 2021-06-03 152
9061f24bf82ec2 Florian Westphal 2021-06-03 153 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
9061f24bf82ec2 Florian Westphal 2021-06-03 154 optval, sizeof(val));
9061f24bf82ec2 Florian Westphal 2021-06-03 155 if (ret)
9061f24bf82ec2 Florian Westphal 2021-06-03 156 return ret;
9061f24bf82ec2 Florian Westphal 2021-06-03 157
9061f24bf82ec2 Florian Westphal 2021-06-03 158 lock_sock(sk);
9061f24bf82ec2 Florian Westphal 2021-06-03 159 mptcp_for_each_subflow(msk, subflow) {
9061f24bf82ec2 Florian Westphal 2021-06-03 160 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
9061f24bf82ec2 Florian Westphal 2021-06-03 161 bool slow = lock_sock_fast(ssk);
9061f24bf82ec2 Florian Westphal 2021-06-03 162
9061f24bf82ec2 Florian Westphal 2021-06-03 163 switch (optname) {
9061f24bf82ec2 Florian Westphal 2021-06-03 164 case SO_TIMESTAMP_OLD:
9061f24bf82ec2 Florian Westphal 2021-06-03 165 case SO_TIMESTAMP_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 166 case SO_TIMESTAMPNS_OLD:
9061f24bf82ec2 Florian Westphal 2021-06-03 167 case SO_TIMESTAMPNS_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 168 sock_set_timestamp(sk, optname, !!val);
9061f24bf82ec2 Florian Westphal 2021-06-03 169 break;
9061f24bf82ec2 Florian Westphal 2021-06-03 170 case SO_TIMESTAMPING_NEW:
9061f24bf82ec2 Florian Westphal 2021-06-03 171 case SO_TIMESTAMPING_OLD:
f03864a45f4fe9 Yangbo Lu 2021-06-15 172 sock_set_timestamping(sk, optname, val, optval, optlen);
9061f24bf82ec2 Florian Westphal 2021-06-03 173 break;
9061f24bf82ec2 Florian Westphal 2021-06-03 174 }
9061f24bf82ec2 Florian Westphal 2021-06-03 175
9061f24bf82ec2 Florian Westphal 2021-06-03 176 unlock_sock_fast(ssk, slow);
9061f24bf82ec2 Florian Westphal 2021-06-03 177 }
9061f24bf82ec2 Florian Westphal 2021-06-03 178
9061f24bf82ec2 Florian Westphal 2021-06-03 179 release_sock(sk);
9061f24bf82ec2 Florian Westphal 2021-06-03 180 return 0;
9061f24bf82ec2 Florian Westphal 2021-06-03 181 }
9061f24bf82ec2 Florian Westphal 2021-06-03 182
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Hi Mat, > -----Original Message----- > From: Mat Martineau <mathew.j.martineau@linux.intel.com> > Sent: 2021年6月16日 9:01 > To: Y.b. Lu <yangbo.lu@nxp.com> > Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; > linux-kselftest@vger.kernel.org; mptcp@lists.linux.dev; Richard Cochran > <richardcochran@gmail.com>; David S . Miller <davem@davemloft.net>; > Jakub Kicinski <kuba@kernel.org>; Matthieu Baerts > <matthieu.baerts@tessares.net>; Shuah Khan <shuah@kernel.org>; Michal > Kubecek <mkubecek@suse.cz>; Florian Fainelli <f.fainelli@gmail.com>; > Andrew Lunn <andrew@lunn.ch>; Rui Sousa <rui.sousa@nxp.com>; Sebastien > Laveze <sebastien.laveze@nxp.com>; Florian Westphal <fw@strlen.de> > Subject: Re: [net-next, v3, 07/10] net: sock: extend SO_TIMESTAMPING for > PHC binding > > On Tue, 15 Jun 2021, Yangbo Lu wrote: > > > Since PTP virtual clock support is added, there can be several PTP > > virtual clocks based on one PTP physical clock for timestamping. > > > > This patch is to extend SO_TIMESTAMPING API to support PHC (PTP > > Hardware Clock) binding by adding a new flag > > SOF_TIMESTAMPING_BIND_PHC. When PTP virtual clocks are in use, user > > space can configure to bind one for timestamping, but PTP physical > > clock is not supported and not needed to bind. > > > > This patch is preparation for timestamp conversion from raw timestamp > > to a specific PTP virtual clock time in core net. > > > > Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> > > --- > > Changes for v3: > > - Added this patch. > > --- > > include/net/sock.h | 8 +++- > > include/uapi/linux/net_tstamp.h | 17 ++++++++- > > net/core/sock.c | 65 > +++++++++++++++++++++++++++++++-- > > net/ethtool/common.c | 1 + > > net/mptcp/sockopt.c | 10 +++-- > > 5 files changed, 91 insertions(+), 10 deletions(-) > > [...] > > @@ -166,7 +169,7 @@ static int > mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam > > break; > > case SO_TIMESTAMPING_NEW: > > case SO_TIMESTAMPING_OLD: > > - sock_set_timestamping(sk, optname, val); > > + sock_set_timestamping(sk, optname, val, optval, optlen); > > This is inside a loop, so in cases where optlen == sizeof(struct > so_timestamping) this will end up re-copying the structure from userspace > one extra time for each MPTCP subflow: once for the MPTCP socket, plus one > time for each of the TCP subflows that are grouped under this MPTCP > connection. > > Given that the extra copies only happen when using the extended bind_phc > option, it's not a huge cost. But sock_set_timestamping() was written to > avoid the extra copies for 'int' sized options, and if that was worth the > effort then the larger so_timestamping structure could be copied (once) > before the sock_set_timestamping() call and passed in. I see now... Let me pass so_timestamping structure in to avoid re-copying from userspace. > > > break; > > } > > > > @@ -207,7 +210,8 @@ static int mptcp_setsockopt_sol_socket_int(struct > mptcp_sock *msk, int optname, > > case SO_TIMESTAMPNS_NEW: > > case SO_TIMESTAMPING_OLD: > > case SO_TIMESTAMPING_NEW: > > - return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); > > + return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val, > > + optval, optlen); > > Rather than modifying mptcp_setsockopt_sol_socket_int(), I suggest adding > a mptcp_setsockopt_sol_socket_timestamping() helper function that can > handle the special copying for so_timestamping. Thank you. Let me do this in next version. > > > } > > > > return -ENOPROTOOPT; > > -- > > 2.25.1 > > > > > > -- > Mat Martineau > Intel
diff --git a/include/net/sock.h b/include/net/sock.h index 9b341c2c924f..adb6c0edc867 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -316,7 +316,9 @@ struct bpf_local_storage; * @sk_timer: sock cleanup timer * @sk_stamp: time stamp of last packet received * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only - * @sk_tsflags: SO_TIMESTAMPING socket options + * @sk_tsflags: SO_TIMESTAMPING flags + * @sk_bind_phc: SO_TIMESTAMPING bind PHC index of PTP virtual clock + * for timestamping * @sk_tskey: counter to disambiguate concurrent tstamp requests * @sk_zckey: counter to order MSG_ZEROCOPY notifications * @sk_socket: Identd and reporting IO signals @@ -493,6 +495,7 @@ struct sock { seqlock_t sk_stamp_seq; #endif u16 sk_tsflags; + int sk_bind_phc; u8 sk_shutdown; u32 sk_tskey; atomic_t sk_zckey; @@ -2744,7 +2747,8 @@ void sock_def_readable(struct sock *sk); int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk); void sock_set_timestamp(struct sock *sk, int optname, bool valbool); -int sock_set_timestamping(struct sock *sk, int optname, int val); +int sock_set_timestamping(struct sock *sk, int optname, int val, + sockptr_t optval, unsigned int optlen); void sock_enable_timestamps(struct sock *sk); void sock_no_linger(struct sock *sk); diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h index 7ed0b3d1c00a..9d4cde4ef7e6 100644 --- a/include/uapi/linux/net_tstamp.h +++ b/include/uapi/linux/net_tstamp.h @@ -13,7 +13,7 @@ #include <linux/types.h> #include <linux/socket.h> /* for SO_TIMESTAMPING */ -/* SO_TIMESTAMPING gets an integer bit field comprised of these values */ +/* SO_TIMESTAMPING flags */ enum { SOF_TIMESTAMPING_TX_HARDWARE = (1<<0), SOF_TIMESTAMPING_TX_SOFTWARE = (1<<1), @@ -30,8 +30,9 @@ enum { SOF_TIMESTAMPING_OPT_STATS = (1<<12), SOF_TIMESTAMPING_OPT_PKTINFO = (1<<13), SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14), + SOF_TIMESTAMPING_BIND_PHC = (1<<15), - SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_TX_SWHW, + SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_BIND_PHC, SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) | SOF_TIMESTAMPING_LAST }; @@ -46,6 +47,18 @@ enum { SOF_TIMESTAMPING_TX_SCHED | \ SOF_TIMESTAMPING_TX_ACK) +/** + * struct so_timestamping - SO_TIMESTAMPING parameter + * + * @flags: SO_TIMESTAMPING flags + * @bind_phc: Index of PTP virtual clock bound to sock. This is available + * if flag SOF_TIMESTAMPING_BIND_PHC is set. + */ +struct so_timestamping { + int flags; + int bind_phc; +}; + /** * struct hwtstamp_config - %SIOCGHWTSTAMP and %SIOCSHWTSTAMP parameter * diff --git a/net/core/sock.c b/net/core/sock.c index ddfa88082a2b..70d2c2322429 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -139,6 +139,8 @@ #include <net/tcp.h> #include <net/busy_poll.h> +#include <linux/ethtool.h> + static DEFINE_MUTEX(proto_list_mutex); static LIST_HEAD(proto_list); @@ -794,8 +796,53 @@ void sock_set_timestamp(struct sock *sk, int optname, bool valbool) } } -int sock_set_timestamping(struct sock *sk, int optname, int val) +static int sock_timestamping_bind_phc(struct sock *sk, int phc_index) { + struct ethtool_phc_vclocks phc_vclocks = { }; + struct net *net = sock_net(sk); + struct net_device *dev = NULL; + bool match = false; + int i; + + if (sk->sk_bound_dev_if) + dev = dev_get_by_index(net, sk->sk_bound_dev_if); + + if (!dev) { + pr_err("%s: sock not bind to device\n", __func__); + return -EOPNOTSUPP; + } + + ethtool_op_get_phc_vclocks(dev, &phc_vclocks); + + for (i = 0; i < phc_vclocks.num; i++) { + if (phc_vclocks.index[i] == phc_index) { + match = true; + break; + } + } + + if (!match) + return -EINVAL; + + sk->sk_bind_phc = phc_index; + + return 0; +} + +int sock_set_timestamping(struct sock *sk, int optname, int val, + sockptr_t optval, unsigned int optlen) +{ + struct so_timestamping timestamping; + int ret; + + if (optlen == sizeof(timestamping)) { + if (copy_from_sockptr(×tamping, optval, + sizeof(timestamping))) + return -EFAULT; + + val = timestamping.flags; + } + if (val & ~SOF_TIMESTAMPING_MASK) return -EINVAL; @@ -816,6 +863,15 @@ int sock_set_timestamping(struct sock *sk, int optname, int val) !(val & SOF_TIMESTAMPING_OPT_TSONLY)) return -EINVAL; + if (optlen == sizeof(timestamping) && + val & SOF_TIMESTAMPING_BIND_PHC) { + ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc); + if (ret) + return ret; + } else { + sk->sk_bind_phc = -1; + } + sk->sk_tsflags = val; sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW); @@ -1057,7 +1113,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname, case SO_TIMESTAMPING_NEW: case SO_TIMESTAMPING_OLD: - ret = sock_set_timestamping(sk, optname, val); + ret = sock_set_timestamping(sk, optname, val, optval, optlen); break; case SO_RCVLOWAT: @@ -1332,6 +1388,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname, struct __kernel_old_timeval tm; struct __kernel_sock_timeval stm; struct sock_txtime txtime; + struct so_timestamping timestamping; } v; int lv = sizeof(int); @@ -1435,7 +1492,9 @@ int sock_getsockopt(struct socket *sock, int level, int optname, break; case SO_TIMESTAMPING_OLD: - v.val = sk->sk_tsflags; + lv = sizeof(v.timestamping); + v.timestamping.flags = sk->sk_tsflags; + v.timestamping.bind_phc = sk->sk_bind_phc; break; case SO_RCVTIMEO_OLD: diff --git a/net/ethtool/common.c b/net/ethtool/common.c index 14035f2dc6d4..4bf1bd3a3db6 100644 --- a/net/ethtool/common.c +++ b/net/ethtool/common.c @@ -398,6 +398,7 @@ const char sof_timestamping_names[][ETH_GSTRING_LEN] = { [const_ilog2(SOF_TIMESTAMPING_OPT_STATS)] = "option-stats", [const_ilog2(SOF_TIMESTAMPING_OPT_PKTINFO)] = "option-pktinfo", [const_ilog2(SOF_TIMESTAMPING_OPT_TX_SWHW)] = "option-tx-swhw", + [const_ilog2(SOF_TIMESTAMPING_BIND_PHC)] = "bind-phc", }; static_assert(ARRAY_SIZE(sof_timestamping_names) == __SOF_TIMESTAMPING_CNT); diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c index 092d1f635d27..2ca90b230827 100644 --- a/net/mptcp/sockopt.c +++ b/net/mptcp/sockopt.c @@ -140,7 +140,10 @@ static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); } -static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) +static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, + int optname, int val, + sockptr_t optval, + unsigned int optlen) { sockptr_t optval = KERNEL_SOCKPTR(&val); struct mptcp_subflow_context *subflow; @@ -166,7 +169,7 @@ static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam break; case SO_TIMESTAMPING_NEW: case SO_TIMESTAMPING_OLD: - sock_set_timestamping(sk, optname, val); + sock_set_timestamping(sk, optname, val, optval, optlen); break; } @@ -207,7 +210,8 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, case SO_TIMESTAMPNS_NEW: case SO_TIMESTAMPING_OLD: case SO_TIMESTAMPING_NEW: - return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); + return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val, + optval, optlen); } return -ENOPROTOOPT;
Since PTP virtual clock support is added, there can be several PTP virtual clocks based on one PTP physical clock for timestamping. This patch is to extend SO_TIMESTAMPING API to support PHC (PTP Hardware Clock) binding by adding a new flag SOF_TIMESTAMPING_BIND_PHC. When PTP virtual clocks are in use, user space can configure to bind one for timestamping, but PTP physical clock is not supported and not needed to bind. This patch is preparation for timestamp conversion from raw timestamp to a specific PTP virtual clock time in core net. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> --- Changes for v3: - Added this patch. --- include/net/sock.h | 8 +++- include/uapi/linux/net_tstamp.h | 17 ++++++++- net/core/sock.c | 65 +++++++++++++++++++++++++++++++-- net/ethtool/common.c | 1 + net/mptcp/sockopt.c | 10 +++-- 5 files changed, 91 insertions(+), 10 deletions(-)