Compute ICRC Signed-off-by: Bob Pearson <rpear...@systemfabricworks.com>
--- 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; +} -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html