[bpf-next,0/3] Introduce GRO support to cpumap codebase

Message

Lorenzo Bianconi Nov. 29, 2024, 11:10 p.m. UTC

Add GRO support to cpumap codebase moving the cpu_map_entry kthread to a
NAPI-kthread pinned to the selected cpu.
Introduce napi_init_for_gro utility routine to initialize napi struct
subfields not dependent by net_device pointer in order to not add
net_device dependency in the cpumap_entry.
This series has been tested by Daniel using tcp_rr and tcp_stream:

Baseline (again)							

./tcp_rr -c -H $TASK_IP -p 50,90,99 -T4 -F8 -l30			        ./tcp_stream -c -H $TASK_IP -T8 -F16 -l30
							
	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
Run 1	2560252	        0.00009087	0.00010495	0.00011647		Run 1	15479.31
Run 2	2665517	        0.00008575	0.00010239	0.00013311		Run 2	15162.48
Run 3	2755939	        0.00008191	0.00010367	0.00012287		Run 3	14709.04
Run 4	2595680	        0.00008575	0.00011263	0.00012671		Run 4	15373.06
Run 5	2841865	        0.00007999	0.00009471	0.00012799		Run 5	15234.91
Average	2683850.6	0.000084854	0.00010367	0.00012543		Average	15191.76
							
cpumap NAPI patches v2							
							
	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
Run 1	2577838	        0.00008575	0.00012031	0.00013695		Run 1	19914.56
Run 2	2729237	        0.00007551	0.00013311	0.00017663		Run 2	20140.92
Run 3	2689442	        0.00008319	0.00010495	0.00013311		Run 3	19887.48
Run 4	2862366	        0.00008127	0.00009471	0.00010623		Run 4	19374.49
Run 5	2700538	        0.00008319	0.00010367	0.00012799		Run 5	19784.49
Average	2711884.2	0.000081782	0.00011135	0.000136182		Average	19820.388
Delta	1.04%	        -3.62%	        7.41%	        8.57%			        30.47%

IIUC, to be 100% honest, the above results have been obtained running
the proposed series with a different kernel version.

---
Lorenzo Bianconi (3):
      net: Add napi_init_for_gro utility routine
      net: add napi_threaded_poll to netdevice.h
      bpf: cpumap: Add gro support

 include/linux/netdevice.h |   3 ++
 kernel/bpf/cpumap.c       | 125 +++++++++++++++++++---------------------------
 net/core/dev.c            |  21 +++++---
 3 files changed, 70 insertions(+), 79 deletions(-)
---
base-commit: c8d02b547363880d996f80c38cc8b997c7b90725
change-id: 20241129-cpumap-gro-431ffd03aa5e

Best regards,