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powerpc32/bpf: Add fsession support

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Extend JIT support of fsession in powerpc64 trampoline, since
ppc64 and ppc32 shares common trampoline implementation.
Arch specific helpers handle 64-bit data copy using 32 bit regs.

Need to validate fsession support along with trampoline support.

Signed-off-by: Abhishek Dubey <adubey@linux.ibm.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260401141043.41513-2-adubey@linux.ibm.com
This commit is contained in:
Abhishek Dubey
2026-04-01 10:10:43 -04:00
committed by Madhavan Srinivasan
parent 6fab063bd8
commit 92258b5bf1
2 changed files with 42 additions and 1 deletions
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8
arch/powerpc/net/bpf_jit_comp.c
View File

@@ -542,7 +542,13 @@ bool bpf_jit_supports_private_stack(void)
bool bpf_jit_supports_fsession(void)
{
return IS_ENABLED(CONFIG_PPC64);
/*
* TODO: Remove after validating support
* for fsession and trampoline on ppc32.
*/
if (IS_ENABLED(CONFIG_PPC32))
return -EOPNOTSUPP;
return true;
}
bool bpf_jit_supports_arena(void)

35
arch/powerpc/net/bpf_jit_comp32.c
View File

@@ -123,6 +123,41 @@ void bpf_jit_realloc_regs(struct codegen_context *ctx)
}
}
void prepare_for_fsession_fentry(u32 *image, struct codegen_context *ctx, int cookie_cnt,
int cookie_off, int retval_off)
{
/*
* Set session cookies value
* Clear cookies field on stack
* Ensure retval to be cleared on fentry
*/
EMIT(PPC_RAW_LI(bpf_to_ppc(TMP_REG), 0));
for (int i = 0; i < cookie_cnt; i++) {
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, cookie_off + 4 * i));
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, cookie_off + 4 * i + 4));
}
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, retval_off));
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, retval_off + 4));
}
void store_func_meta(u32 *image, struct codegen_context *ctx,
u64 func_meta, int func_meta_off)
{
/*
* Store func_meta to stack: [R1 + func_meta_off] = func_meta
* func_meta := argument count in first byte + cookie value
*/
/* Store lower word */
EMIT(PPC_RAW_LI32(bpf_to_ppc(TMP_REG), (u32)func_meta));
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, func_meta_off));
/* Store upper word */
EMIT(PPC_RAW_LI32(bpf_to_ppc(TMP_REG), (u32)(func_meta >> 32)));
EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, func_meta_off + 4));
}
void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
{
int i;