Author: cem
Date: Tue May 3 17:06:33 2016
New Revision: 298988
URL: https://svnweb.freebsd.org/changeset/base/298988
Log:
ioat(4): Add CRC descriptor structure
Add CRC/MOVECRC operations, as well as the TEST and STORE variants.
With these operations, a CRC32C can be computed over one or more
descriptors' source data. When the STORE operation is encountered, the
accumulated CRC32C is emitted to memory. A TEST operations triggers an
IOAT channel error if the accumulated CRC32C does not match one in
memory.
These operations are not exposed through any API yet.
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/dev/ioat/ioat_internal.h
Modified: head/sys/dev/ioat/ioat_internal.h
==============================================================================
--- head/sys/dev/ioat/ioat_internal.h Tue May 3 17:05:58 2016
(r298987)
+++ head/sys/dev/ioat/ioat_internal.h Tue May 3 17:06:33 2016
(r298988)
@@ -211,6 +211,85 @@ struct ioat_fill_hw_descriptor {
uint64_t user2;
};
+struct ioat_crc32_hw_descriptor {
+ uint32_t size;
+ union {
+ uint32_t control_raw;
+ struct generic_dma_control control_generic;
+ struct {
+ uint32_t int_enable:1;
+ uint32_t src_snoop_disable:1;
+ uint32_t dest_snoop_disable:1;
+ uint32_t completion_update:1;
+ uint32_t fence:1;
+ uint32_t reserved1:3;
+ uint32_t bundle:1;
+ uint32_t dest_dca:1;
+ uint32_t hint:1;
+ uint32_t use_seed:1;
+ /*
+ * crc_location:
+ * For IOAT_OP_MOVECRC_TEST and IOAT_OP_CRC_TEST:
+ * 0: comparison value is pointed to by CRC Address
+ * field.
+ * 1: comparison value follows data in wire format
+ * ("inverted reflected bit order") in the 4 bytes
+ * following the source data.
+ *
+ * For IOAT_OP_CRC_STORE:
+ * 0: Result will be stored at location pointed to by
+ * CRC Address field (in wire format).
+ * 1: Result will be stored directly following the
+ * source data.
+ *
+ * For IOAT_OP_MOVECRC_STORE:
+ * 0: Result will be stored at location pointed to by
+ * CRC Address field (in wire format).
+ * 1: Result will be stored directly following the
+ * *destination* data.
+ */
+ uint32_t crc_location:1;
+ uint32_t reserved2:11;
+ /*
+ * MOVECRC - Move data in the same way as standard copy
+ * operation, but also compute CRC32.
+ *
+ * CRC - Only compute CRC on source data.
+ *
+ * There is a CRC accumulator register in the hardware.
+ * If 'initial' is set, it is initialized to the value
+ * in 'seed.'
+ *
+ * In all modes, these operators accumulate size bytes
+ * at src_addr into the running CRC32C.
+ *
+ * Store mode emits the accumulated CRC, in wire
+ * format, as specified by the crc_location bit above.
+ *
+ * Test mode compares the accumulated CRC against the
+ * reference CRC, as described in crc_location above.
+ * On failure, halts the DMA engine with a CRC error
+ * status.
+ */
+ #define IOAT_OP_MOVECRC 0x41
+ #define IOAT_OP_MOVECRC_TEST 0x42
+ #define IOAT_OP_MOVECRC_STORE 0x43
+ #define IOAT_OP_CRC 0x81
+ #define IOAT_OP_CRC_TEST 0x82
+ #define IOAT_OP_CRC_STORE 0x83
+ uint32_t op:8;
+ } control;
+ } u;
+ uint64_t src_addr;
+ uint64_t dest_addr;
+ uint64_t next;
+ uint64_t next_src_addr;
+ uint64_t next_dest_addr;
+ uint32_t seed;
+ uint32_t reserved;
+ uint64_t crc_address;
+};
+
struct ioat_xor_hw_descriptor {
uint32_t size;
union {
@@ -338,6 +417,7 @@ struct ioat_descriptor {
struct ioat_generic_hw_descriptor *generic;
struct ioat_dma_hw_descriptor *dma;
struct ioat_fill_hw_descriptor *fill;
+ struct ioat_crc32_hw_descriptor *crc32;
struct ioat_xor_hw_descriptor *xor;
struct ioat_xor_ext_hw_descriptor *xor_ext;
struct ioat_pq_hw_descriptor *pq;
@@ -348,13 +428,7 @@ struct ioat_descriptor {
bus_addr_t hw_desc_bus_addr;
};
-/* Unsupported by this driver at this time. */
-#define IOAT_OP_MOVECRC 0x41
-#define IOAT_OP_MOVECRC_TEST 0x42
-#define IOAT_OP_MOVECRC_STORE 0x43
-#define IOAT_OP_CRC 0x81
-#define IOAT_OP_CRC_TEST 0x82
-#define IOAT_OP_CRC_STORE 0x83
+/* Unused by this driver at this time. */
#define IOAT_OP_MARKER 0x84
/*
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