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net: remove deprecated syststamp timestamp

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The SO_TIMESTAMPING API defines three types of timestamps: software,
hardware in raw format (hwtstamp) and hardware converted to system
format (syststamp). The last has been deprecated in favor of combining
hwtstamp with a PTP clock driver. There are no active users in the
kernel.

The option was device driver dependent. If set, but without hardware
support, the correct behavior is to return zero in the relevant field
in the SCM_TIMESTAMPING ancillary message. Without device drivers
implementing the option, this field is effectively always zero.

Remove the internal plumbing to dissuage new drivers from implementing
the feature. Keep the SOF_TIMESTAMPING_SYS_HARDWARE flag, however, to
avoid breaking existing applications that request the timestamp.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn
2014-07-25 18:01:32 -04:00
committed by David S. Miller
parent 68a360e82e
commit 4d276eb6a4
6 changed files with 11 additions and 49 deletions
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11
include/net/sock.h
View File

@@ -707,7 +707,6 @@ enum sock_flags {
SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */
SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
SOCK_FASYNC, /* fasync() active */
SOCK_RXQ_OVFL,
SOCK_ZEROCOPY, /* buffers from userspace */
@@ -2166,16 +2165,13 @@ sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
* - software time stamp available and wanted
* (SOCK_TIMESTAMPING_SOFTWARE)
* - hardware time stamps available and wanted
* (SOCK_TIMESTAMPING_SYS_HARDWARE or
* SOCK_TIMESTAMPING_RAW_HARDWARE)
* SOCK_TIMESTAMPING_RAW_HARDWARE
*/
if (sock_flag(sk, SOCK_RCVTSTAMP) ||
sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
(kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
(hwtstamps->hwtstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) ||
(hwtstamps->syststamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)))
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)))
__sock_recv_timestamp(msg, sk, skb);
else
sk->sk_stamp = kt;
@@ -2193,8 +2189,7 @@ static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
#define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
(1UL << SOCK_RCVTSTAMP) | \
(1UL << SOCK_TIMESTAMPING_SOFTWARE) | \
(1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \
(1UL << SOCK_TIMESTAMPING_SYS_HARDWARE))
(1UL << SOCK_TIMESTAMPING_RAW_HARDWARE))
if (sk->sk_flags & FLAGS_TS_OR_DROPS)
__sock_recv_ts_and_drops(msg, sk, skb);