raid6test: add new corner case for ioatdma driver

With 24 disks and an ioatdma instance with 16 source support there is a
corner case where the driver needs to be careful to account for the
number of implied sources in the continuation case.

Also bump the default case to test more than 16 sources now that it
triggers different paths in offload drivers.

Cc: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c
index 4a92bac744dce500a209f5e4e6033d465eff5dc9..dad95f45b88f6566afc62df645151d3a2ae60092 100644 (file)
--- a/crypto/async_tx/raid6test.c
+++ b/crypto/async_tx/raid6test.c
@@ -28,7 +28,7 @@
 #undef pr
 #define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
 
-#define NDISKS 16 /* Including P and Q */
+#define NDISKS 64 /* Including P and Q */
 
 static struct page *dataptrs[NDISKS];
 static addr_conv_t addr_conv[NDISKS];
@@ -219,6 +219,14 @@ static int raid6_test(void)
                err += test(11, &tests);
                err += test(12, &tests);
        }
+
+       /* the 24 disk case is special for ioatdma as it is the boudary point
+        * at which it needs to switch from 8-source ops to 16-source
+        * ops for continuation (assumes DMA_HAS_PQ_CONTINUE is not set)
+        */
+       if (NDISKS > 24)
+               err += test(24, &tests);
+
        err += test(NDISKS, &tests);
 
        pr("\n");