// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
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*/
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#include "rxe.h"
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#include "rxe_loc.h"
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/* Compute a partial ICRC for all the IB transport headers. */
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u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb)
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{
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unsigned int bth_offset = 0;
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struct iphdr *ip4h = NULL;
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struct ipv6hdr *ip6h = NULL;
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struct udphdr *udph;
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struct rxe_bth *bth;
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int crc;
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int length;
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int hdr_size = sizeof(struct udphdr) +
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(skb->protocol == htons(ETH_P_IP) ?
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sizeof(struct iphdr) : sizeof(struct ipv6hdr));
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/* pseudo header buffer size is calculate using ipv6 header size since
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* it is bigger than ipv4
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*/
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u8 pshdr[sizeof(struct udphdr) +
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sizeof(struct ipv6hdr) +
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RXE_BTH_BYTES];
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/* This seed is the result of computing a CRC with a seed of
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* 0xfffffff and 8 bytes of 0xff representing a masked LRH.
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*/
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crc = 0xdebb20e3;
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if (skb->protocol == htons(ETH_P_IP)) { /* IPv4 */
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memcpy(pshdr, ip_hdr(skb), hdr_size);
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ip4h = (struct iphdr *)pshdr;
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udph = (struct udphdr *)(ip4h + 1);
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ip4h->ttl = 0xff;
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ip4h->check = CSUM_MANGLED_0;
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ip4h->tos = 0xff;
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} else { /* IPv6 */
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memcpy(pshdr, ipv6_hdr(skb), hdr_size);
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ip6h = (struct ipv6hdr *)pshdr;
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udph = (struct udphdr *)(ip6h + 1);
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memset(ip6h->flow_lbl, 0xff, sizeof(ip6h->flow_lbl));
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ip6h->priority = 0xf;
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ip6h->hop_limit = 0xff;
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}
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udph->check = CSUM_MANGLED_0;
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bth_offset += hdr_size;
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memcpy(&pshdr[bth_offset], pkt->hdr, RXE_BTH_BYTES);
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bth = (struct rxe_bth *)&pshdr[bth_offset];
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/* exclude bth.resv8a */
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bth->qpn |= cpu_to_be32(~BTH_QPN_MASK);
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length = hdr_size + RXE_BTH_BYTES;
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crc = rxe_crc32(pkt->rxe, crc, pshdr, length);
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/* And finish to compute the CRC on the remainder of the headers. */
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crc = rxe_crc32(pkt->rxe, crc, pkt->hdr + RXE_BTH_BYTES,
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rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
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return crc;
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}
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