powerpc: Add 64bit csum_and_copy_to_user

This adds the equivalent of csum_and_copy_from_user for the receive side so we
can copy and checksum in one pass. It is modelled on the generic checksum
routine.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h
index 9ea58c0..ce0c284 100644 (file)
--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h
@@ -57,6 +57,9 @@ extern __wsum csum_partial_copy_generic(const void *src, void *dst,
 #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
 extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
                                      int len, __wsum sum, int *err_ptr);
+#define HAVE_CSUM_COPY_USER
+extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
+                                   int len, __wsum sum, int *err_ptr);
 #else
 /*
  * the same as csum_partial, but copies from src to dst while it

diff --git a/arch/powerpc/lib/checksum_wrappers_64.c b/arch/powerpc/lib/checksum_wrappers_64.c
index 614cff1..769b817 100644 (file)
--- a/arch/powerpc/lib/checksum_wrappers_64.c
+++ b/arch/powerpc/lib/checksum_wrappers_64.c
@@ -63,3 +63,40 @@ out:
        return (__force __wsum)csum;
 }
 EXPORT_SYMBOL(csum_and_copy_from_user);
+
+__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
+                            __wsum sum, int *err_ptr)
+{
+       unsigned int csum;
+
+       might_sleep();
+
+       *err_ptr = 0;
+
+       if (!len) {
+               csum = 0;
+               goto out;
+       }
+
+       if (unlikely((len < 0) || !access_ok(VERIFY_WRITE, dst, len))) {
+               *err_ptr = -EFAULT;
+               csum = -1; /* invalid checksum */
+               goto out;
+       }
+
+       csum = csum_partial_copy_generic(src, (void __force *)dst,
+                                        len, sum, NULL, err_ptr);
+
+       if (unlikely(*err_ptr)) {
+               csum = csum_partial(src, len, sum);
+
+               if (copy_to_user(dst, src, len)) {
+                       *err_ptr = -EFAULT;
+                       csum = -1; /* invalid checksum */
+               }
+       }
+
+out:
+       return (__force __wsum)csum;
+}
+EXPORT_SYMBOL(csum_and_copy_to_user);