xsk: TX metadata launch time support #6054
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This patch extends the XDP Tx metadata framework to include Time-Based Scheduling (TBS) support where the NIC will schedule a 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@google.com> Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
This patch enables launch time support to XDP zero copy via XDP Tx metadata framework. Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
This patch adds launch time support to xdp_hw_metadata. User can configure the delta of HW launch time to HW RX-time by using "-l" argument. This patch is tested with stmmac on Intel Tiger Lake platform. Refer to result below, the delta between pre-determined launch time and actual transmit time is around 24 us. $ sudo ./xdp_hw_metadata enp0s30f4 ... xsk_ring_cons__peek: 1 0x55fcb80ce7a8: rx_desc[0]->addr=80100 addr=80100 comp_addr=80100 EoP No rx_hash err=-95 HW RX-time: 1677764507059055964 (sec:1677764507.0591) delta to User RX-time sec:0.0002 (237.548 usec) XDP RX-time: 1677764507059280741 (sec:1677764507.0593) delta to User RX-time sec:0.0000 (12.771 usec) 0x55fcb80ce7a8: ping-pong with csum=5619 (want 8626) csum_start=34 csum_offset=6 HW RX-time: 1677764507059055964 (sec:1677764507.0591) delta to HW Launch-time sec:1.0000 (1000000.000 usec) 0x55fcb80ce7a8: complete tx idx=0 addr=18 HW Launch-time: 1677764508059055964 (sec:1677764508.0591) delta to HW TX-complete-time sec:0.0000 (24.235 usec) HW TX-complete-time: 1677764508059080199 (sec:1677764508.0591) delta to User TX-complete-time sec:0.0054 (5423.263 usec) XDP RX-time: 1677764507059280741 (sec:1677764507.0593) delta to User TX-complete-time sec:1.0052 (1005222.721 usec) HW RX-time: 1677764507059055964 (sec:1677764507.0591) delta to HW TX-complete-time sec:1.0000 (1000024.235 usec) 0x55fcb80ce7a8: complete rx idx=128 addr=80100 $ sudo ./xdp_hw_metadata enp0s30f4 -l 10000000 ... xsk_ring_cons__peek: 1 0x5626d54de7a8: rx_desc[0]->addr=80100 addr=80100 comp_addr=80100 EoP No rx_hash err=-95 HW RX-time: 1677764655807717783 (sec:1677764655.8077) delta to User RX-time sec:0.0002 (240.571 usec) XDP RX-time: 1677764655807942983 (sec:1677764655.8079) delta to User RX-time sec:0.0000 (15.371 usec) 0x5626d54de7a8: ping-pong with csum=5619 (want 8626) csum_start=34 csum_offset=6 HW RX-time: 1677764655807717783 (sec:1677764655.8077) delta to HW Launch-time sec:0.0100 (10000.000 usec) 0x5626d54de7a8: complete tx idx=0 addr=18 HW Launch-time: 1677764655817717783 (sec:1677764655.8177) delta to HW TX-complete-time sec:0.0000 (23.965 usec) HW TX-complete-time: 1677764655817741748 (sec:1677764655.8177) delta to User TX-complete-time sec:0.0003 (291.792 usec) XDP RX-time: 1677764655807942983 (sec:1677764655.8079) delta to User TX-complete-time sec:0.0101 (10090.557 usec) HW RX-time: 1677764655807717783 (sec:1677764655.8077) delta to HW TX-complete-time sec:0.0100 (10023.965 usec) 0x5626d54de7a8: complete rx idx=128 addr=80100 Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
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Upstream branch: f690ff9 |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=805667 expired. Closing PR. |
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Pull request for series with
subject: xsk: TX metadata launch time support
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=805667