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xsk: Add launch time hardware offload support to XDP Tx metadata

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Extend the XDP Tx metadata framework so that user can requests launch time
hardware offload, where the Ethernet device will schedule the packet for
transmission at a pre-determined time called launch time. The value of
launch time is communicated from user space to Ethernet driver via
launch_time field of struct xsk_tx_metadata.

Suggested-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20250216093430.957880-2-yoong.siang.song@intel.com
This commit is contained in:
Song Yoong Siang
2025-02-16 17:34:26 +08:00
committed by Andrii Nakryiko
parent 5cbd13ee02
commit 89cad6a160
2 changed files with 13 additions and 0 deletions
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10
include/uapi/linux/if_xdp.h
View File

@@ -127,6 +127,12 @@ struct xdp_options {
*/
#define XDP_TXMD_FLAGS_CHECKSUM (1 << 1)
/* Request launch time hardware offload. The device will schedule the packet for
* transmission at a pre-determined time called launch time. The value of
* launch time is communicated via launch_time field of struct xsk_tx_metadata.
*/
#define XDP_TXMD_FLAGS_LAUNCH_TIME (1 << 2)
/* AF_XDP offloads request. 'request' union member is consumed by the driver
* when the packet is being transmitted. 'completion' union member is
* filled by the driver when the transmit completion arrives.
@@ -142,6 +148,10 @@ struct xsk_tx_metadata {
__u16 csum_start;
/* Offset from csum_start where checksum should be stored. */
__u16 csum_offset;
/* XDP_TXMD_FLAGS_LAUNCH_TIME */
/* Launch time in nanosecond against the PTP HW Clock */
__u64 launch_time;
} request;
struct {

3
include/uapi/linux/netdev.h
View File

@@ -59,10 +59,13 @@ enum netdev_xdp_rx_metadata {
* by the driver.
* @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the
* driver.
* @NETDEV_XSK_FLAGS_TX_LAUNCH_TIME_FIFO: Launch time HW offload is supported
* by the driver.
*/
enum netdev_xsk_flags {
NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1,
NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
NETDEV_XSK_FLAGS_TX_LAUNCH_TIME_FIFO = 4,
};
enum netdev_queue_type {