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| author | Richard Cochran <rcochran@linutronix.de> | 2018-07-03 15:42:48 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-04 22:30:27 +0900 |
| commit | 80b14dee2bea128928537d61c333f24cb8cbb62f (patch) | |
| tree | 94fda7f405d0ae225e35a2089111d3ad80006752 /include/net/sock.h | |
| parent | c47d8c2f38f805ba541496ddd7d8c3aee59b49d5 (diff) | |
| download | linux-80b14dee2bea128928537d61c333f24cb8cbb62f.tar.gz linux-80b14dee2bea128928537d61c333f24cb8cbb62f.tar.bz2 linux-80b14dee2bea128928537d61c333f24cb8cbb62f.zip | |
net: Add a new socket option for a future transmit time.
This patch introduces SO_TXTIME. User space enables this option in
order to pass a desired future transmit time in a CMSG when calling
sendmsg(2). The argument to this socket option is a 8-bytes long struct
provided by the uapi header net_tstamp.h defined as:
struct sock_txtime {
clockid_t clockid;
u32 flags;
};
Note that new fields were added to struct sock by filling a 2-bytes
hole found in the struct. For that reason, neither the struct size or
number of cachelines were altered.
Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sock.h')
| -rw-r--r-- | include/net/sock.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index 2ed99bfa4595..68347b9821c6 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -319,6 +319,9 @@ struct sock_common { * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 * @sk_reuseport_cb: reuseport group container * @sk_rcu: used during RCU grace period + * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME) + * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME + * @sk_txtime_unused: unused txtime flags */ struct sock { /* @@ -475,6 +478,11 @@ struct sock { u8 sk_shutdown; u32 sk_tskey; atomic_t sk_zckey; + + u8 sk_clockid; + u8 sk_txtime_deadline_mode : 1, + sk_txtime_unused : 7; + struct socket *sk_socket; void *sk_user_data; #ifdef CONFIG_SECURITY @@ -790,6 +798,7 @@ enum sock_flags { SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ + SOCK_TXTIME, }; #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) @@ -1585,6 +1594,7 @@ void sock_kzfree_s(struct sock *sk, void *mem, int size); void sk_send_sigurg(struct sock *sk); struct sockcm_cookie { + u64 transmit_time; u32 mark; u16 tsflags; }; |