1. Optimization
------------
The current implementation copies the 'from' and 'to' buffers to a
scratchpad and it takes the bitwise NOT of 'from' buffer while copying.
In the next step csum_partial() is called with this scratchpad.
so, mathematically, the current implementation is doing:
result = csum(to - from)
Here, 'to' and '~ from' are copied in to the scratchpad buffer, we need
it in the scratchpad buffer because csum_partial() takes a single
contiguous buffer and not two disjoint buffers like 'to' and 'from'.
We can re write this equation to:
result = csum(to) - csum(from)
using the distributive property of csum().
this allows 'to' and 'from' to be at different locations and therefore
this scratchpad and copying is not needed.
This in C code will look like:
result = csum_sub(csum_partial(to, to_size, seed),
csum_partial(from, from_size, 0));
2. Homogenization
--------------
The bpf_csum_diff() helper calls csum_partial() which is implemented by
some architectures like arm and x86 but other architectures rely on the
generic implementation in lib/checksum.c
The generic implementation in lib/checksum.c returns a 16 bit value but
the arch specific implementations can return more than 16 bits, this
works out in most places because before the result is used, it is passed
through csum_fold() that turns it into a 16-bit value.
bpf_csum_diff() directly returns the value from csum_partial() and
therefore the returned values could be different on different
architectures. see discussion in [1]:
for the int value 28 the calculated checksums are:
x86 : -29 : 0xffffffe3
generic (arm64, riscv) : 65507 : 0x0000ffe3
arm : 131042 : 0x0001ffe2
Pass the result of bpf_csum_diff() through from32to16() before returning
to homogenize this result for all architectures.
NOTE: from32to16() is used instead of csum_fold() because csum_fold()
does from32to16() + bitwise NOT of the result, which is not what we want
to do here.
[1] https://lore.kernel.org/bpf/CAJ+HfNiQbOcqCLxFUP2FMm5QrLXUUaj852Fxe3hn_2JNiucn6g@xxxxxxxxxxxxxx/
Signed-off-by: Puranjay Mohan <puranjay@xxxxxxxxxx>
---
net/core/filter.c | 37 +++++++++----------------------------
1 file changed, 9 insertions(+), 28 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index bd0d08bf76bb8..e00bec7de9edd 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1654,18 +1654,6 @@ void sk_reuseport_prog_free(struct bpf_prog *prog)
bpf_prog_destroy(prog);
}
-struct bpf_scratchpad {
- union {
- __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
- u8 buff[MAX_BPF_STACK];
- };
- local_lock_t bh_lock;
-};
-
-static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp) = {
- .bh_lock = INIT_LOCAL_LOCK(bh_lock),
-};
-
static inline int __bpf_try_make_writable(struct sk_buff *skb,
unsigned int write_len)
{
@@ -2022,11 +2010,6 @@ static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
__be32 *, to, u32, to_size, __wsum, seed)
{
- struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
- u32 diff_size = from_size + to_size;
- int i, j = 0;
- __wsum ret;
-
/* This is quite flexible, some examples:
*
* from_size == 0, to_size > 0, seed := csum --> pushing data
@@ -2035,19 +2018,17 @@ BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
*
* Even for diffing, from_size and to_size don't need to be equal.
*/
- if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
- diff_size > sizeof(sp->diff)))
- return -EINVAL;
- local_lock_nested_bh(&bpf_sp.bh_lock);
- for (i = 0; i < from_size / sizeof(__be32); i++, j++)
- sp->diff[j] = ~from[i];
- for (i = 0; i < to_size / sizeof(__be32); i++, j++)
- sp->diff[j] = to[i];
+ if (from_size && to_size)
+ return csum_from32to16(csum_sub(csum_partial(to, to_size, seed),
+ csum_partial(from, from_size, 0)));
+ if (to_size)
+ return csum_from32to16(csum_partial(to, to_size, seed));
- ret = csum_partial(sp->diff, diff_size, seed);
- local_unlock_nested_bh(&bpf_sp.bh_lock);
- return ret;
+ if (from_size)
+ return csum_from32to16(~csum_partial(from, from_size, ~seed));
+
+ return seed;
}
static const struct bpf_func_proto bpf_csum_diff_proto = {
--
2.40.1
