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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 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, struct sk_buff *skb)
{
unsigned int bth_offset = 0;
struct iphdr *ip4h = NULL;
struct ipv6hdr *ip6h = NULL;
struct udphdr *udph;
struct rxe_bth *bth;
int crc;
int length;
int hdr_size = sizeof(struct udphdr) +
(skb->protocol == htons(ETH_P_IP) ?
sizeof(struct iphdr) : sizeof(struct ipv6hdr));
/* pseudo header buffer size is calculate using ipv6 header size since
* it is bigger than ipv4
*/
u8 pshdr[sizeof(struct udphdr) +
sizeof(struct ipv6hdr) +
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;
if (skb->protocol == htons(ETH_P_IP)) { /* IPv4 */
memcpy(pshdr, ip_hdr(skb), hdr_size);
ip4h = (struct iphdr *)pshdr;
udph = (struct udphdr *)(ip4h + 1);
ip4h->ttl = 0xff;
ip4h->check = CSUM_MANGLED_0;
ip4h->tos = 0xff;
} else { /* IPv6 */
memcpy(pshdr, ipv6_hdr(skb), hdr_size);
ip6h = (struct ipv6hdr *)pshdr;
udph = (struct udphdr *)(ip6h + 1);
memset(ip6h->flow_lbl, 0xff, sizeof(ip6h->flow_lbl));
ip6h->priority = 0xf;
ip6h->hop_limit = 0xff;
}
udph->check = CSUM_MANGLED_0;
bth_offset += hdr_size;
memcpy(&pshdr[bth_offset], pkt->hdr, RXE_BTH_BYTES);
bth = (struct rxe_bth *)&pshdr[bth_offset];
/* exclude bth.resv8a */
bth->qpn |= cpu_to_be32(~BTH_QPN_MASK);
length = hdr_size + RXE_BTH_BYTES;
crc = crc32_le(crc, pshdr, length);
/* And finish to compute the CRC on the remainder of the headers. */
crc = crc32_le(crc, pkt->hdr + RXE_BTH_BYTES,
rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
return crc;
}
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