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

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.

Song Yoong Siang committed 1 year ago

Commit ca4419f1 parent 68b92ac10 files · +108 −0Browse files

Showing the changes to include/uapi/linux (2 of 10 files). Show all

Unified · Split

2 files

include/uapi/linux/if_xdp.h +10 −0
include/uapi/linux/netdev.h +3 −0

include/uapi/linux/if_xdp.h+10−0

@@ -127,6 +127,12 @@ struct xdp_options { · 126 unmodified lines
127	127	*/
128	128	#define XDP_TXMD_FLAGS_CHECKSUM (1 << 1)
129	129
	130	+/* Request launch time hardware offload. The device will schedule the packet for
	131	+ * transmission at a pre-determined time called launch time. The value of
	132	+ * launch time is communicated via launch_time field of struct xsk_tx_metadata.
	133	+ */
	134	+#define XDP_TXMD_FLAGS_LAUNCH_TIME (1 << 2)
	135	+
130	136	/* AF_XDP offloads request. 'request' union member is consumed by the driver
131	137	* when the packet is being transmitted. 'completion' union member is
132	138	* filled by the driver when the transmit completion arrives.
@@ -142,6 +148,10 @@ struct xsk_tx_metadata { · 9 unmodified lines
142	148	__u16 csum_start;
143	149	/* Offset from csum_start where checksum should be stored. */
144	150	__u16 csum_offset;
	151	+
	152	+ /* XDP_TXMD_FLAGS_LAUNCH_TIME */
	153	+ /* Launch time in nanosecond against the PTP HW Clock */
	154	+ __u64 launch_time;
145	155	} request;
146	156
147	157	struct {

include/uapi/linux/netdev.h+3−0

@@ -59,10 +59,13 @@ enum netdev_xdp_rx_metadata { · 58 unmodified lines
59	59	* by the driver.
60	60	* @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the
61	61	* driver.
	62	+ * @NETDEV_XSK_FLAGS_TX_LAUNCH_TIME_FIFO: Launch time HW offload is supported
	63	+ * by the driver.
62	64	*/
63	65	enum netdev_xsk_flags {
64	66	NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1,
65	67	NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
	68	+ NETDEV_XSK_FLAGS_TX_LAUNCH_TIME_FIFO = 4,
66	69	};
67	70
68	71	enum netdev_queue_type {