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-rw-r--r--lib/raid6/int.uc40
1 files changed, 39 insertions, 1 deletions
diff --git a/lib/raid6/int.uc b/lib/raid6/int.uc
index 5ca60bee1388..558aeac9342a 100644
--- a/lib/raid6/int.uc
+++ b/lib/raid6/int.uc
@@ -107,9 +107,47 @@ static void raid6_int$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
}
}
+static void raid6_int$#_xor_syndrome(int disks, int start, int stop,
+ size_t bytes, void **ptrs)
+{
+ u8 **dptr = (u8 **)ptrs;
+ u8 *p, *q;
+ int d, z, z0;
+
+ unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
+
+ z0 = stop; /* P/Q right side optimization */
+ p = dptr[disks-2]; /* XOR parity */
+ q = dptr[disks-1]; /* RS syndrome */
+
+ for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
+ /* P/Q data pages */
+ wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];
+ for ( z = z0-1 ; z >= start ; z-- ) {
+ wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];
+ wp$$ ^= wd$$;
+ w2$$ = MASK(wq$$);
+ w1$$ = SHLBYTE(wq$$);
+ w2$$ &= NBYTES(0x1d);
+ w1$$ ^= w2$$;
+ wq$$ = w1$$ ^ wd$$;
+ }
+ /* P/Q left side optimization */
+ for ( z = start-1 ; z >= 0 ; z-- ) {
+ w2$$ = MASK(wq$$);
+ w1$$ = SHLBYTE(wq$$);
+ w2$$ &= NBYTES(0x1d);
+ wq$$ = w1$$ ^ w2$$;
+ }
+ *(unative_t *)&p[d+NSIZE*$$] ^= wp$$;
+ *(unative_t *)&q[d+NSIZE*$$] ^= wq$$;
+ }
+
+}
+
const struct raid6_calls raid6_intx$# = {
raid6_int$#_gen_syndrome,
- NULL, /* XOR not yet implemented */
+ raid6_int$#_xor_syndrome,
NULL, /* always valid */
"int" NSTRING "x$#",
0