linux.git/arch/arm/net, branch v4.18 Linux kernel source tree bpf, arm32: fix to use bpf_jit_binary_lock_ro api 2018-06-29T17:47:35+00:00 Daniel Borkmann daniel@iogearbox.net 2018-06-28T21:34:57+00:00 18d405af30bf6506bf2fc49056de7691c949812e Any eBPF JIT that where its underlying arch supports ARCH_HAS_SET_MEMORY would need to use bpf_jit_binary_{un,}lock_ro() pair instead of the set_memory_{ro,rw}() pair directly as otherwise changes to the former might break. arm32's eBPF conversion missed to change it, so fix this up here. Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Any eBPF JIT that where its underlying arch supports ARCH_HAS_SET_MEMORY
would need to use bpf_jit_binary_{un,}lock_ro() pair instead of the
set_memory_{ro,rw}() pair directly as otherwise changes to the former
might break. arm32's eBPF conversion missed to change it, so fix this
up here.

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf, arm32: fix inconsistent naming about emit_a32_lsr_{r64,i64} 2018-06-05T08:54:53+00:00 Wang YanQing udknight@gmail.com 2018-05-11T02:52:17+00:00 68565a1af9f7012e6f2fe2bdd612f67d2d830c28 The names for BPF_ALU64 | BPF_ARSH are emit_a32_arsh_*, the names for BPF_ALU64 | BPF_LSH are emit_a32_lsh_*, but the names for BPF_ALU64 | BPF_RSH are emit_a32_lsr_*. For consistence reason, let's rename emit_a32_lsr_* to emit_a32_rsh_*. This patch also corrects a wrong comment. Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler") Signed-off-by: Wang YanQing <udknight@gmail.com> Cc: Shubham Bansal <illusionist.neo@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux@armlinux.org.uk Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> 
The names for BPF_ALU64 | BPF_ARSH are emit_a32_arsh_*,
the names for BPF_ALU64 | BPF_LSH are emit_a32_lsh_*, but
the names for BPF_ALU64 | BPF_RSH are emit_a32_lsr_*.

For consistence reason, let's rename emit_a32_lsr_* to
emit_a32_rsh_*.

This patch also corrects a wrong comment.

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Wang YanQing <udknight@gmail.com>
Cc: Shubham Bansal <illusionist.neo@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@armlinux.org.uk
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
bpf, arm32: correct check_imm24 2018-06-05T08:46:13+00:00 Wang YanQing udknight@gmail.com 2018-05-11T03:06:34+00:00 2b589a7e2bd3eb610a4b7f5e61393481755a4de9 imm24 is signed, so the right range is: [-(1<<(24 - 1)), (1<<(24 - 1)) - 1] Note: this patch also fix a typo. Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler") Signed-off-by: Wang YanQing <udknight@gmail.com> Cc: Shubham Bansal <illusionist.neo@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux@armlinux.org.uk Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> 
imm24 is signed, so the right range is:

  [-(1<<(24 - 1)), (1<<(24 - 1)) - 1]

Note: this patch also fix a typo.

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Wang YanQing <udknight@gmail.com>
Cc: Shubham Bansal <illusionist.neo@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@armlinux.org.uk
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
bpf, arm32: save 4 bytes of unneeded stack space 2018-05-15T02:11:45+00:00 Daniel Borkmann daniel@iogearbox.net 2018-05-14T21:22:30+00:00 38ca930601631585fbd7826f8f6908055a8dbc9e The extra skb_copy_bits() buffer is not used anymore, therefore remove the extra 4 byte stack space requirement. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
The extra skb_copy_bits() buffer is not used anymore, therefore
remove the extra 4 byte stack space requirement.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf, arm32: remove ld_abs/ld_ind 2018-05-03T23:49:20+00:00 Daniel Borkmann daniel@iogearbox.net 2018-05-03T23:08:19+00:00 0d2d0cedc0814edaa2b6cb290c78ec333b3eed71 Since LD_ABS/LD_IND instructions are now removed from the core and reimplemented through a combination of inlined BPF instructions and a slow-path helper, we can get rid of the complexity from arm32 JIT. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Since LD_ABS/LD_IND instructions are now removed from the core and
reimplemented through a combination of inlined BPF instructions and
a slow-path helper, we can get rid of the complexity from arm32 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf, arm: remove obsolete exception handling from div/mod 2018-01-27T00:42:07+00:00 Daniel Borkmann daniel@iogearbox.net 2018-01-26T22:33:47+00:00 73ae3c0426f01295ef307caf9531c0453b8f2728 Since we've changed div/mod exception handling for src_reg in eBPF verifier itself, remove the leftovers from arm32 JIT. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Shubham Bansal <illusionist.neo@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Since we've changed div/mod exception handling for src_reg in
eBPF verifier itself, remove the leftovers from arm32 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Shubham Bansal <illusionist.neo@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-01-21T03:03:46+00:00 David S. Miller davem@davemloft.net 2018-01-21T03:03:46+00:00 ea9722e2650db8f0a0d9ef2e391c95285ef991cd Alexei Starovoitov says: ==================== pull-request: bpf-next 2018-01-19 The following pull-request contains BPF updates for your *net-next* tree. The main changes are: 1) bpf array map HW offload, from Jakub. 2) support for bpf_get_next_key() for LPM map, from Yonghong. 3) test_verifier now runs loaded programs, from Alexei. 4) xdp cpumap monitoring, from Jesper. 5) variety of tests, cleanups and small x64 JIT optimization, from Daniel. 6) user space can now retrieve HW JITed program, from Jiong. Note there is a minor conflict between Russell's arm32 JIT fixes and removal of bpf_jit_enable variable by Daniel which should be resolved by keeping Russell's comment and removing that variable. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> 
Alexei Starovoitov says:

====================
pull-request: bpf-next 2018-01-19

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) bpf array map HW offload, from Jakub.

2) support for bpf_get_next_key() for LPM map, from Yonghong.

3) test_verifier now runs loaded programs, from Alexei.

4) xdp cpumap monitoring, from Jesper.

5) variety of tests, cleanups and small x64 JIT optimization, from Daniel.

6) user space can now retrieve HW JITed program, from Jiong.

Note there is a minor conflict between Russell's arm32 JIT fixes
and removal of bpf_jit_enable variable by Daniel which should
be resolved by keeping Russell's comment and removing that variable.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-20T03:59:33+00:00 David S. Miller davem@davemloft.net 2018-01-20T03:59:33+00:00 8565d26bcb2ff6df646e946d2913fcf706d46b66 The BPF verifier conflict was some minor contextual issue. The TUN conflict was less trivial. Cong Wang fixed a memory leak of tfile->tx_array in 'net'. This is an skb_array. But meanwhile in net-next tun changed tfile->tx_arry into tfile->tx_ring which is a ptr_ring. Signed-off-by: David S. Miller <davem@davemloft.net> 
The BPF verifier conflict was some minor contextual issue.

The TUN conflict was less trivial.  Cong Wang fixed a memory leak of
tfile->tx_array in 'net'.  This is an skb_array.  But meanwhile in
net-next tun changed tfile->tx_arry into tfile->tx_ring which is a
ptr_ring.

Signed-off-by: David S. Miller <davem@davemloft.net>
bpf: get rid of pure_initcall dependency to enable jits 2018-01-20T02:37:00+00:00 Daniel Borkmann daniel@iogearbox.net 2018-01-20T00:24:33+00:00 fa9dd599b4dae841924b022768354cfde9affecb Having a pure_initcall() callback just to permanently enable BPF JITs under CONFIG_BPF_JIT_ALWAYS_ON is unnecessary and could leave a small race window in future where JIT is still disabled on boot. Since we know about the setting at compilation time anyway, just initialize it properly there. Also consolidate all the individual bpf_jit_enable variables into a single one and move them under one location. Moreover, don't allow for setting unspecified garbage values on them. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Having a pure_initcall() callback just to permanently enable BPF
JITs under CONFIG_BPF_JIT_ALWAYS_ON is unnecessary and could leave
a small race window in future where JIT is still disabled on boot.
Since we know about the setting at compilation time anyway, just
initialize it properly there. Also consolidate all the individual
bpf_jit_enable variables into a single one and move them under one
location. Moreover, don't allow for setting unspecified garbage
values on them.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
ARM: net: bpf: clarify tail_call index 2018-01-17T19:39:10+00:00 Russell King rmk+kernel@armlinux.org.uk 2018-01-13T12:11:26+00:00 091f02483df7b56615b524491f404e574c5e0668 As per 90caccdd8cc0 ("bpf: fix bpf_tail_call() x64 JIT"), the index used for array lookup is defined to be 32-bit wide. Update a misleading comment that suggests it is 64-bit wide. Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler") Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> 
As per 90caccdd8cc0 ("bpf: fix bpf_tail_call() x64 JIT"), the index used
for array lookup is defined to be 32-bit wide. Update a misleading
comment that suggests it is 64-bit wide.

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>