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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2015-09-22 16:34:27 +0200 |
|---|---|---|
| committer | Scott Wood <oss@buserror.net> | 2016-03-05 05:53:27 +0100 |
| commit | 7aef4136566b0539a1a98391181e188905e33401 (patch) | |
| tree | b088e0b9ae9a50d68c6ff8ba1fbbb175c9d15a98 /fs/bad_inode.c | |
| parent | powerpc: inline ip_fast_csum() (diff) | |
| download | linux-7aef4136566b0539a1a98391181e188905e33401.tar.xz linux-7aef4136566b0539a1a98391181e188905e33401.zip | |
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()
csum_partial_copy_generic() does the same as copy_tofrom_user and also
calculates the checksum during the copy. Unlike copy_tofrom_user(),
the existing version of csum_partial_copy_generic() doesn't take
benefit of the cache.
This patch is a rewrite of csum_partial_copy_generic() based on
copy_tofrom_user().
The previous version of csum_partial_copy_generic() was handling
errors. Now we have the checksum wrapper functions to handle the error
case like in powerpc64 so we can make the error case simple:
just return -EFAULT.
copy_tofrom_user() only has r12 available => we use it for the
checksum r7 and r8 which contains pointers to error feedback are used,
so we stack them.
On a TCP benchmark using socklib on the loopback interface on which
checksum offload and scatter/gather have been deactivated, we get
about 20% performance increase.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions