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Mon, 16 Feb 2026 10:52:57 +0000 (GMT) From: adubey@linux.ibm.com To: bpf@vger.kernel.org Cc: hbathini@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@kernel.org, eddyz87@gmail.com, yonghong.song@linux.dev, clm@meta.com, ihor.solodrai@linux.dev, chleroy@kernel.org, Abhishek Dubey Subject: [PATCH 3/3] powerpc32/bpf: Add fsession support Date: Mon, 16 Feb 2026 10:53:10 -0500 Message-ID: <20260216155310.38457-3-adubey@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260216155310.38457-1-adubey@linux.ibm.com> References: <20260216155310.38457-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: nEgH6frHMIvewrpChD0Hisy_VMYOOLqL X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjE2MDA5MCBTYWx0ZWRfX2vpzY9BZK9Vx QgCB/BmVb0/Qi+OM7/ZO4m6CLAor/N8rIuNmGJsVKJ426mWWPwBl/rEKIUoMFFsJMaI2GmJl6iQ Dm2e6yHcmGswDNDG0v3Yi32JlC86MBTRwCOec11hA8oRK/CnsyDB6vdImwQfhMy+YJiIQDqnJnw +OPjJFVwwIN8nEbqVCzNOs277ynKE+5gI/Kilu7+wkE6NA5YeTG/eFGH9fFzmbsQVit8pMejOA7 KCf/DIyPl3FkNzIF1/4GmuDg7XFs8y5tCp1jkz+OYdwM3mbCM7GCINJQqp7v5peJmHe6TF80GC5 CxvGGhwesrz9MmPnqmnQpfbqAvxq6wdj7xsWP6qtBa8ezY1iLul+ngMG90KYs0gW5+9fZ3Iffet hIAj3Blx2O83Ac5ejfZIVQ20pOMbwhjWUQeYcSyTU6CNwcPW+lLGl9fQpfFWXROHo3jJc+xRIeR UbE/WkMbrMJ3+IIowrw== X-Proofpoint-GUID: vcHD1HVWe-I1JxvKtHROaS96omExZ4Ve X-Authority-Analysis: v=2.4 cv=U+mfzOru c=1 sm=1 tr=0 ts=6992f711 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=VnNF1IyMAAAA:8 a=_ySWqCA71J16aY6q5SMA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-16_04,2026-02-16_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 impostorscore=0 malwarescore=0 spamscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602160090 From: Abhishek Dubey 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 --- arch/powerpc/net/bpf_jit_comp.c | 8 ++++++- arch/powerpc/net/bpf_jit_comp32.c | 35 +++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 65e091064fe4..31896ed34129 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -529,7 +529,13 @@ 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) diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c index 3087e744fb25..72dc2a55d66c 100644 --- a/arch/powerpc/net/bpf_jit_comp32.c +++ b/arch/powerpc/net/bpf_jit_comp32.c @@ -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_LI(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_LI(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; -- 2.52.0