kernel/linux.git/include/uapi/linux/net_tstamp.h, branch v6.18.21

net: add UAPI to the header guard in various network headers

2025-04-18T02:04:50+00:00

fib_rule, ip6_tunnel, and a whole lot of if_* headers lack the customary _UAPI in the header guard. Without it YNL build can't protect from in tree and system headers both getting included. YNL doesn't need most of these but it's annoying to have to fix them one by one. Note that header installation strips this _UAPI prefix so this should result in no change to the end user. Acked-by: Jamal Hadi Salim Reviewed-by: Jason Xing Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20250416200840.1338195-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

net-timestamp: COMPLETION timestamp on packet tx completion

2025-03-25T16:48:05+00:00

Add SOF_TIMESTAMPING_TX_COMPLETION, for requesting a software timestamp when hardware reports a packet completed. Completion tstamp is useful for Bluetooth, as hardware timestamps do not exist in the HCI specification except for ISO packets, and the hardware has a queue where packets may wait. In this case the software SND timestamp only reflects the kernel-side part of the total latency (usually small) and queue length (usually 0 unless HW buffers congested), whereas the completion report time is more informative of the true latency. It may also be useful in other cases where HW TX timestamps cannot be obtained and user wants to estimate an upper bound to when the TX probably happened. Signed-off-by: Pauli Virtanen Reviewed-by: Willem de Bruijn Signed-off-by: Luiz Augusto von Dentz

net: Add the possibility to support a selected hwtstamp in netdevice

2024-12-16T12:51:40+00:00

Introduce the description of a hwtstamp provider, mainly defined with a the hwtstamp source and the phydev pointer. Add a hwtstamp provider description within the netdev structure to allow saving the hwtstamp we want to use. This prepares for future support of an ethtool netlink command to select the desired hwtstamp provider. By default, the old API that does not support hwtstamp selectability is used, meaning the hwtstamp provider pointer is unset. Signed-off-by: Kory Maincent Signed-off-by: David S. Miller

net-timestamp: introduce SOF_TIMESTAMPING_OPT_RX_FILTER flag

2024-09-10T23:55:23+00:00

introduce a new flag SOF_TIMESTAMPING_OPT_RX_FILTER in the receive path. User can set it with SOF_TIMESTAMPING_SOFTWARE to filter out rx software timestamp report, especially after a process turns on netstamp_needed_key which can time stamp every incoming skb. Previously, we found out if an application starts first which turns on netstamp_needed_key, then another one only passing SOF_TIMESTAMPING_SOFTWARE could also get rx timestamp. Now we handle this case by introducing this new flag without breaking users. Quoting Willem to explain why we need the flag: "why a process would want to request software timestamp reporting, but not receive software timestamp generation. The only use I see is when the application does request SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_TX_SOFTWARE." Similarly, this new flag could also be used for hardware case where we can set it with SOF_TIMESTAMPING_RAW_HARDWARE, then we won't receive hardware receive timestamp. Another thing about errqueue in this patch I have a few words to say: In this case, we need to handle the egress path carefully, or else reporting the tx timestamp will fail. Egress path and ingress path will finally call sock_recv_timestamp(). We have to distinguish them. Errqueue is a good indicator to reflect the flow direction. Suggested-by: Willem de Bruijn Signed-off-by: Jason Xing Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20240909015612.3856-2-kerneljasonxing@gmail.com Signed-off-by: Jakub Kicinski

net_tstamp: add SOF_TIMESTAMPING_OPT_ID_TCP

2022-12-09T03:49:21+00:00

Add an option to initialize SOF_TIMESTAMPING_OPT_ID for TCP from write_seq sockets instead of snd_una. This should have been the behavior from the start. Because processes may now exist that rely on the established behavior, do not change behavior of the existing option, but add the right behavior with a new flag. It is encouraged to always set SOF_TIMESTAMPING_OPT_ID_TCP on stream sockets along with the existing SOF_TIMESTAMPING_OPT_ID. Intuitively the contract is that the counter is zero after the setsockopt, so that the next write N results in a notification for the last byte N - 1. On idle sockets snd_una == write_seq and this holds for both. But on sockets with data in transmission, snd_una records the unacked offset in the stream. This depends on the ACK response from the peer. A process cannot learn this in a race free manner (ioctl SIOCOUTQ is one racy approach). write_seq records the offset at the last byte written by the process. This is a better starting point. It matches the intuitive contract in all circumstances, unaffected by external behavior. The new timestamp flag necessitates increasing sk_tsflags to 32 bits. Move the field in struct sock to avoid growing the socket (for some common CONFIG variants). The UAPI interface so_timestamping.flags is already int, so 32 bits wide. Reported-by: Sotirios Delimanolis Signed-off-by: Willem de Bruijn Link: https://lore.kernel.org/r/20221207143701.29861-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski

net_tstamp: define new flag HWTSTAMP_FLAG_BONDED_PHC_INDEX

2021-12-29T20:31:36+00:00

As we defined the new hwtstamp_config flag HWTSTAMP_FLAG_BONDED_PHC_INDEX as enum, it's not easy for userspace program to check if the flag is supported when build. Let's define the new flag so user space could build it on old kernel with ifdef check. Fixes: 9c9211a3fc7a ("net_tstamp: add new flag HWTSTAMP_FLAG_BONDED_PHC_INDEX") Signed-off-by: Hangbin Liu Acked-by: Richard Cochran Signed-off-by: Jakub Kicinski

net_tstamp: add new flag HWTSTAMP_FLAG_BONDED_PHC_INDEX

2021-12-14T12:28:24+00:00

Since commit 94dd016ae538 ("bond: pass get_ts_info and SIOC[SG]HWTSTAMP ioctl to active device") the user could get bond active interface's PHC index directly. But when there is a failover, the bond active interface will change, thus the PHC index is also changed. This may break the user's program if they did not update the PHC timely. This patch adds a new hwtstamp_config flag HWTSTAMP_FLAG_BONDED_PHC_INDEX. When the user wants to get the bond active interface's PHC, they need to add this flag and be aware the PHC index may be changed. With the new flag. All flag checks in current drivers are removed. Only the checking in net_hwtstamp_validate() is kept. Suggested-by: Jakub Kicinski Signed-off-by: Hangbin Liu Signed-off-by: David S. Miller

net: sock: extend SO_TIMESTAMPING for PHC binding

2021-07-01T20:08:18+00:00

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 Signed-off-by: David S. Miller

ethtool: add timestamping related string sets

2020-03-30T05:32:36+00:00

Add three string sets related to timestamping information: ETH_SS_SOF_TIMESTAMPING: SOF_TIMESTAMPING_* flags ETH_SS_TS_TX_TYPES: timestamping Tx types ETH_SS_TS_RX_FILTERS: timestamping Rx filters These will be used for TIMESTAMP_GET request. v2: avoid compiler warning ("enumeration value not handled in switch") in net_hwtstamp_validate() v3: omit dash in Tx type names ("one-step-*" -> "onestep-*"), suggested by Richard Cochran Signed-off-by: Michal Kubecek Acked-by: Richard Cochran Signed-off-by: David S. Miller

net: Introduce peer to peer one step PTP time stamping.

2019-12-26T03:51:34+00:00

The 1588 standard defines one step operation for both Sync and PDelay_Resp messages. Up until now, hardware with P2P one step has been rare, and kernel support was lacking. This patch adds support of the mode in anticipation of new hardware developments. Signed-off-by: Richard Cochran Signed-off-by: David S. Miller