[MIPS] csum_partial and copy in parallel

Implement optimized asm version of csum_partial_copy_nocheck,
csum_partial_copy_from_user and csum_and_copy_to_user which can do
calculate and copy in parallel, based on memcpy.S.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 19 insertions, 12 deletions

diff --git a/include/asm-mips/checksum.h b/include/asm-mips/checksum.h
index 9b768c3b96b3..24cdcc6eaab8 100644
--- a/include/asm-mips/checksum.h
+++ b/include/asm-mips/checksum.h
@@ -29,31 +29,38 @@
  */
 __wsum csum_partial(const void *buff, int len, __wsum sum);
 
+__wsum __csum_partial_copy_user(const void *src, void *dst,
+                                int len, __wsum sum, int *err_ptr);
+
 /*
  * this is a new version of the above that records errors it finds in *errp,
  * but continues and zeros the rest of the buffer.
  */
-__wsum csum_partial_copy_from_user(const void __user *src,
-                                         void *dst, int len,
-                                         __wsum sum, int *errp);
+static inline
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
+                                   __wsum sum, int *err_ptr)
+{
+        might_sleep();
+        return __csum_partial_copy_user((__force void *)src, dst,
+                                        len, sum, err_ptr);
+}
 
 /*
  * Copy and checksum to user
  */
 #define HAVE_CSUM_COPY_USER
-static inline __wsum csum_and_copy_to_user (const void *src, void __user *dst,
-                                                  int len, __wsum sum,
-                                                  int *err_ptr)
+static inline
+__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
+                             __wsum sum, int *err_ptr)
 {
         might_sleep();
-        sum = csum_partial(src, len, sum);
-
-        if (copy_to_user(dst, src, len)) {
+        if (access_ok(VERIFY_WRITE, dst, len))
+                return __csum_partial_copy_user(src, (__force void *)dst,
+                                                len, sum, err_ptr);
+        if (len)
                 *err_ptr = -EFAULT;
-                return (__force __wsum)-1;
-        }
 
-        return sum;
+        return (__force __wsum)-1; /* invalid checksum */
 }
 
 /*