netdev - [PATCH bpf-next v3 06/10] bpf: Bump MAX_BPF

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Message-Id: <20210915050943.679062-7-memxor@gmail.com>
Date:   Wed, 15 Sep 2021 10:39:39 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     bpf@...r.kernel.org
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        netdev@...r.kernel.org
Subject: [PATCH bpf-next v3 06/10] bpf: Bump MAX_BPF_STACK size to 768 bytes

Increase the maximum stack size accessible to BPF program to 768 bytes.
This is done so that gen_loader can use 94 additional fds for kfunc BTFs
that it passes in to fd_array from the remaining space available for the
loader_stack struct to expand.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
 include/linux/filter.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4a93c12543ee..b214189ece62 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -82,8 +82,8 @@ struct ctl_table_header;
  */
 #define BPF_SYM_ELF_TYPE	't'
 
-/* BPF program can access up to 512 bytes of stack space. */
-#define MAX_BPF_STACK	512
+/* BPF program can access up to 768 bytes of stack space. */
+#define MAX_BPF_STACK	768
 
 /* Helper macros for filter block array initializers. */
 
-- 
2.33.0