| Message ID | 20210308112907.559576-1-bjorn.topel@gmail.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Optimize bpf_redirect_map()/xdp_do_redirect() | expand |
On 3/8/21 12:29 PM, Björn Töpel wrote: > Hi XDP-folks, > > This two patch series contain two optimizations for the > bpf_redirect_map() helper and the xdp_do_redirect() function. > > The bpf_redirect_map() optimization is about avoiding the map lookup > dispatching. Instead of having a switch-statement and selecting the > correct lookup function, we let bpf_redirect_map() be a map operation, > where each map has its own bpf_redirect_map() implementation. This way > the run-time lookup is avoided. > > The xdp_do_redirect() patch restructures the code, so that the map > pointer indirection can be avoided. > > Performance-wise I got 4% improvement for XSKMAP > (sample:xdpsock/rx-drop), and 8% (sample:xdp_redirect_map) on my > machine. > > @Jesper/@Toke I kept your Acked-by: for patch 2. Let me know, if you > don't agree with that decision. > > More details in each commit. > > Changelog: > v5->v6: Removed REDIR enum, and instead use map_id and map_type. (Daniel) > Applied Daniel's fixups on patch 1. (Daniel) > v4->v5: Renamed map operation to map_redirect. (Daniel) > v3->v4: Made bpf_redirect_map() a map operation. (Daniel) > v2->v3: Fix build when CONFIG_NET is not set. (lkp) > v1->v2: Removed warning when CONFIG_BPF_SYSCALL was not set. (lkp) > Cleaned up case-clause in xdp_do_generic_redirect_map(). (Toke) > Re-added comment. (Toke) > rfc->v1: Use map_id, and remove bpf_clear_redirect_map(). (Toke) > Get rid of the macro and use __always_inline. (Jesper) Applied, thanks!
Hello: This series was applied to bpf/bpf-next.git (refs/heads/master): On Mon, 8 Mar 2021 12:29:05 +0100 you wrote: > Hi XDP-folks, > > This two patch series contain two optimizations for the > bpf_redirect_map() helper and the xdp_do_redirect() function. > > The bpf_redirect_map() optimization is about avoiding the map lookup > dispatching. Instead of having a switch-statement and selecting the > correct lookup function, we let bpf_redirect_map() be a map operation, > where each map has its own bpf_redirect_map() implementation. This way > the run-time lookup is avoided. > > [...] Here is the summary with links: - [bpf-next,v6,1/2] bpf, xdp: make bpf_redirect_map() a map operation https://git.kernel.org/bpf/bpf-next/c/e6a4750ffe9d - [bpf-next,v6,2/2] bpf, xdp: restructure redirect actions https://git.kernel.org/bpf/bpf-next/c/ee75aef23afe You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
Hi XDP-folks, This two patch series contain two optimizations for the bpf_redirect_map() helper and the xdp_do_redirect() function. The bpf_redirect_map() optimization is about avoiding the map lookup dispatching. Instead of having a switch-statement and selecting the correct lookup function, we let bpf_redirect_map() be a map operation, where each map has its own bpf_redirect_map() implementation. This way the run-time lookup is avoided. The xdp_do_redirect() patch restructures the code, so that the map pointer indirection can be avoided. Performance-wise I got 4% improvement for XSKMAP (sample:xdpsock/rx-drop), and 8% (sample:xdp_redirect_map) on my machine. @Jesper/@Toke I kept your Acked-by: for patch 2. Let me know, if you don't agree with that decision. More details in each commit. Changelog: v5->v6: Removed REDIR enum, and instead use map_id and map_type. (Daniel) Applied Daniel's fixups on patch 1. (Daniel) v4->v5: Renamed map operation to map_redirect. (Daniel) v3->v4: Made bpf_redirect_map() a map operation. (Daniel) v2->v3: Fix build when CONFIG_NET is not set. (lkp) v1->v2: Removed warning when CONFIG_BPF_SYSCALL was not set. (lkp) Cleaned up case-clause in xdp_do_generic_redirect_map(). (Toke) Re-added comment. (Toke) rfc->v1: Use map_id, and remove bpf_clear_redirect_map(). (Toke) Get rid of the macro and use __always_inline. (Jesper) rfc: https://lore.kernel.org/bpf/87im7fy9nc.fsf@toke.dk/ (Cover not on lore!) v1: https://lore.kernel.org/bpf/20210219145922.63655-1-bjorn.topel@gmail.com/ v2: https://lore.kernel.org/bpf/20210220153056.111968-1-bjorn.topel@gmail.com/ v3: https://lore.kernel.org/bpf/20210221200954.164125-3-bjorn.topel@gmail.com/ v4: https://lore.kernel.org/bpf/20210226112322.144927-1-bjorn.topel@gmail.com/ v5: https://lore.kernel.org/bpf/20210227122139.183284-1-bjorn.topel@gmail.com/ Björn Töpel (2): bpf, xdp: make bpf_redirect_map() a map operation bpf, xdp: restructure redirect actions include/linux/bpf.h | 26 ++--- include/linux/filter.h | 31 +++++- include/net/xdp_sock.h | 19 ---- include/trace/events/xdp.h | 62 ++++++----- kernel/bpf/cpumap.c | 9 +- kernel/bpf/devmap.c | 17 ++- kernel/bpf/verifier.c | 13 ++- net/core/filter.c | 209 ++++++++++++++----------------------- net/xdp/xskmap.c | 17 ++- 9 files changed, 195 insertions(+), 208 deletions(-) base-commit: 5e6d87315279db3abe69e2ebfd05fa8f5c014295