[patch v2 30/37] add rxe_icrc.c

[rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org]

[-- Attachment #1: add-rxe_icrc.c --]
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Compute ICRC

Signed-off-by: Bob Pearson <rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>

---
 drivers/infiniband/hw/rxe/rxe_icrc.c |   99 +++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)

Index: infiniband/drivers/infiniband/hw/rxe/rxe_icrc.c
===================================================================
--- /dev/null
+++ infiniband/drivers/infiniband/hw/rxe/rxe_icrc.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2009-2011 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2009-2011 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *	- Redistributions of source code must retain the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer.
+ *
+ *	- Redistributions in binary form must reproduce the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer in the documentation and/or other materials
+ *	  provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+/* Compute a partial ICRC for all the IB transport headers. */
+u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt)
+{
+	u32 crc;
+	unsigned int length;
+	unsigned int grh_offset;
+	unsigned int bth_offset;
+	u8 tmp[RXE_LRH_BYTES + RXE_GRH_BYTES + RXE_BTH_BYTES];
+
+	/* This seed is the result of computing a CRC with a seed of
+	 * 0xfffffff and 8 bytes of 0xff representing a masked LRH. */
+	crc = 0xdebb20e3;
+
+	length = RXE_BTH_BYTES;
+	grh_offset = 0;
+	bth_offset = 0;
+
+	if (pkt->mask & RXE_LRH_MASK) {
+		length += RXE_LRH_BYTES;
+		grh_offset += RXE_LRH_BYTES;
+		bth_offset += RXE_LRH_BYTES;
+	}
+	if (pkt->mask & RXE_GRH_MASK) {
+		length += RXE_GRH_BYTES;
+		bth_offset += RXE_GRH_BYTES;
+	}
+
+	memcpy(tmp, pkt->hdr, length);
+
+	if (pkt->mask & RXE_GRH_MASK) {
+		tmp[grh_offset + 0] |= 0x0f;	/* GRH: tclass */
+		tmp[grh_offset + 1] = 0xff;
+		tmp[grh_offset + 2] = 0xff;
+		tmp[grh_offset + 3] = 0xff;
+		tmp[grh_offset + 7] = 0xff;
+	}
+
+	tmp[bth_offset + 4] = 0xff;		/* BTH: resv8a */
+
+	crc = crc32_le(crc, tmp + grh_offset, length - grh_offset);
+
+	/* And finish to compute the CRC on the remainder of the headers. */
+	crc = crc32_le(crc, pkt->hdr + length,
+		       rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
+
+	return crc;
+}
+
+/* Compute the ICRC for a packet (incoming or outgoing). */
+u32 rxe_icrc_pkt(struct rxe_pkt_info *pkt)
+{
+	u32 crc;
+	int size;
+
+	crc = rxe_icrc_hdr(pkt);
+
+	/* And finish to compute the CRC on the remainder. */
+	size = pkt->paylen - rxe_opcode[pkt->opcode].length - RXE_ICRC_SIZE;
+	crc = crc32_le(crc, payload_addr(pkt), size);
+	crc = ~crc;
+
+	return crc;
+}


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