similar to: [LLVMdev] Unable to generate obj file using llc for bpf

Hi Alexei, I haven't tried to run code yet. The clang frontend can generate machine code for bpf but llc does not do the job. When i use : llc -march bpf -filetype=obj arith.bc It has this error message: Assertion failed: (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file

Oh, they have selection details in the end. Let me check that first... On Sat, Jul 4, 2015 at 4:05 PM Xiaochu Liu <xiaochu1122 at gmail.com> wrote: > Hi Matt, > > I tried debug-only=isel and have some more informations. > The steps before 'Legalized selection'( excluding it) all use v2i32 load. > At the step of 'Legalized selection', it replaced one v2i32

On 06/16/2016 06:57 PM, Richard Henderson via iovisor-dev wrote: > On 06/15/2016 10:14 PM, Alexei Starovoitov wrote: >> On Wed, Jun 15, 2016 at 2:37 PM, Richard Henderson via iovisor-dev >> <iovisor-dev at lists.iovisor.org> wrote: >>> This same value for EM_BPF is being propagated to glibc, >>> elfutils, and binutils. >> >> great! >> Can

On 8/4/15 11:51 PM, Wangnan (F) wrote: > void bpf_store_half(void *skb, int off, int val) > asm("llvm.bpf.store.half"); > int func() > { > bpf_store_half(0, 0, 0); > return 0; > } > > Compiled with: > > $ clang -g -target bpf -O2 -S -c test.c > > And get this: > > .text > .globl func > .align

On Wed, Jun 15, 2016 at 2:37 PM, Richard Henderson via iovisor-dev <iovisor-dev at lists.iovisor.org> wrote: > This same value for EM_BPF is being propagated to glibc, > elfutils, and binutils. great! Can you share the link to glibc and the other patches? > diff --git a/include/llvm/Support/ELF.h b/include/llvm/Support/ELF.h > index 352fd8a..fb8ff71 100644 > ---

On Wed, Aug 05, 2015 at 04:28:13PM +0800, Wangnan (F) wrote: > > It doesn't work for me at first since in my llvm there's only > llvm.bpf.load.*. > > I think llvm.bpf.store.* belone to some patches you haven't posted yet? nope. only loads have special instructions ld_abs/ld_ind which are represented by these intrinsics. stores, so far, are done via single

Hi, Alexei On 2015/7/30 1:13, Alexei Starovoitov wrote: > On 7/29/15 2:38 AM, He Kuang wrote: >> Hi, Alexei >> >> On 2015/7/28 10:18, Alexei Starovoitov wrote: >>> On 7/25/15 3:04 AM, He Kuang wrote: >>>> I noticed that for 64-bit elf format, the reloc sections have >>>> 'Addend' in the entry, but there's no 'Addend' info

Thanks. I'm gonna try tomorrow and let you know. On Thu, Jul 2, 2015 at 6:51 PM Matt Arsenault <Matthew.Arsenault at amd.com> wrote: > On 07/02/2015 06:41 PM, Xiaochu Liu wrote: > > Hi Matt, > > > > I did call addRegisterClass in TargetLowering for all the possible > > types in the register. And for typecasting instructions (i32 to i64), > > it works.

Send again since llvmdev is moved to llvm-dev at lists.llvm.org On 2015/8/5 9:58, Wangnan (F) wrote: > > > On 2015/8/4 17:01, Wangnan (F) wrote: >> For people who in llvmdev: >> >> This mail is belong to a thread in linux kernel mailing list, the >> first message >> can be retrived from: >> >> http://lkml.kernel.org/r/55B1535E.8090406 at

On 2015/8/4 3:44, Alexei Starovoitov wrote: [SNIP] >> I'll post 2 LLVM patches by replying this mail. Please have a look and >> help me >> send them to LLVM if you think my code is correct. > > [SNIP] > patch 2: > do we really need to hack clang? > Can you just define a function that aliases to intrinsic, > like we do for ld_abs/ld_ind ? > void

The virtio_net driver doesn't dynamically change the RX-ring queue layout and backing pages, but instead reject XDP setup if all the conditions for XDP is not meet. Thus, the xdp_rxq_info also remains fairly static. This allow us to simply add the init+reg/unreg to net_device open/close functions. Driver hook points for xdp_rxq_info: * init+reg: virtnet_open * unreg : virtnet_close Cc:

Hi, I suspect that the virtio network driver calls some skb BPF programs with skb->data_end - skb->data != skb->len, but only for forwarded packets. For instance, the attached sched_cls tc program prints skb->data, skb->data_end and skb->len for each packet: <idle>-0 [000] ..s. 491.561727: 0: data: 3110080576 data_end: 3110080704 len: 262

Hi, Quoting Pol Van Aubel (2020-01-21 23:41:48) > Hi, > > Quoting Pavel Hrdina (2020-01-21 12:53:49) > > Thanks for the logs, but it did not help to figure out where the issue > > is. I was hoping to see some error output from the syscall but the line > > that should contain it is empty: > > > > 2020-01-20 19:47:15.589+0000: 8579: debug :

The virtio_net driver doesn't dynamically change the RX-ring queue layout and backing pages, but instead reject XDP setup if all the conditions for XDP is not meet. Thus, the xdp_rxq_info also remains fairly static. This allow us to simply add the init+reg/unreg to net_device open/close functions. Driver hook points for xdp_rxq_info: * init+reg: virtnet_open * unreg : virtnet_close Cc:

On 5 June 2015 at 19:46, Eric Christopher <echristo at gmail.com> wrote: > 1) Alexei has been very active on the port, fixing problems unprompted > 2) As one of the people who've had to had on it in the last few months it > wasn't an issue to keep up to date with the other ports. +1! cheers, --renato

Dear there, I was trying to use clang to cross compile executable directly on my mac to bpf ISA: clang -target bpf-linux-gnu aaa.c But I guess maybe the linker does not support BPF? (with -c clang can generate unlinked objs) Unexpected arch UNREACHABLE executed at llvm/tools/clang/lib/Driver/Tools.cpp:8113 Should I use other linkers to link clang generated BPF objs? Thanks, Xiaochu

A STABLE (not updated since 12/13/02) system shows very strange behavior for devices with a minor mode greater than 256. tcpdump does not work reliably and ls is, uh, "strange", using hex for the minor mode. crw------- 1 root wheel 23, 252 Apr 11 14:29 bpf252 crw------- 1 root wheel 23, 253 Apr 11 14:29 bpf253 crw------- 1 root wheel 23, 254 Apr 11 14:29 bpf254

On Tue, 28 Dec 2021 17:33:39 -0800 Florian Fainelli wrote: > It would be nice if we used the number of files rebuilt because of a > header file change as another metric that the kernel is evaluated with > from release to release (or even on a commit by commit basis). Food for > thought. Maybe Andy has some thoughts, he has been working on dropping unnecessary includes of kernel.h,

On Tue, 28 Dec 2021 17:33:39 -0800 Florian Fainelli wrote: > It would be nice if we used the number of files rebuilt because of a > header file change as another metric that the kernel is evaluated with > from release to release (or even on a commit by commit basis). Food for > thought. Maybe Andy has some thoughts, he has been working on dropping unnecessary includes of kernel.h,

On Sun, Oct 15, 2023 at 7:17?AM Akihiko Odaki <akihiko.odaki at daynix.com> wrote: > > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h > index 0448700890f7..298634556fab 100644 > --- a/include/uapi/linux/bpf.h > +++ b/include/uapi/linux/bpf.h > @@ -988,6 +988,7 @@ enum bpf_prog_type { > BPF_PROG_TYPE_SK_LOOKUP, > BPF_PROG_TYPE_SYSCALL,