// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB /* * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. */ #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 = rxe_crc32(pkt->rxe, crc, pshdr, length); /* And finish to compute the CRC on the remainder of the headers. */ crc = rxe_crc32(pkt->rxe, crc, pkt->hdr + RXE_BTH_BYTES, rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES); return crc; }