1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
4*4882a593Smuzhiyun * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include "rxe.h"
8*4882a593Smuzhiyun #include "rxe_loc.h"
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /* Compute a partial ICRC for all the IB transport headers. */
rxe_icrc_hdr(struct rxe_pkt_info * pkt,struct sk_buff * skb)11*4882a593Smuzhiyun u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun unsigned int bth_offset = 0;
14*4882a593Smuzhiyun struct iphdr *ip4h = NULL;
15*4882a593Smuzhiyun struct ipv6hdr *ip6h = NULL;
16*4882a593Smuzhiyun struct udphdr *udph;
17*4882a593Smuzhiyun struct rxe_bth *bth;
18*4882a593Smuzhiyun int crc;
19*4882a593Smuzhiyun int length;
20*4882a593Smuzhiyun int hdr_size = sizeof(struct udphdr) +
21*4882a593Smuzhiyun (skb->protocol == htons(ETH_P_IP) ?
22*4882a593Smuzhiyun sizeof(struct iphdr) : sizeof(struct ipv6hdr));
23*4882a593Smuzhiyun /* pseudo header buffer size is calculate using ipv6 header size since
24*4882a593Smuzhiyun * it is bigger than ipv4
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun u8 pshdr[sizeof(struct udphdr) +
27*4882a593Smuzhiyun sizeof(struct ipv6hdr) +
28*4882a593Smuzhiyun RXE_BTH_BYTES];
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /* This seed is the result of computing a CRC with a seed of
31*4882a593Smuzhiyun * 0xfffffff and 8 bytes of 0xff representing a masked LRH.
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun crc = 0xdebb20e3;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (skb->protocol == htons(ETH_P_IP)) { /* IPv4 */
36*4882a593Smuzhiyun memcpy(pshdr, ip_hdr(skb), hdr_size);
37*4882a593Smuzhiyun ip4h = (struct iphdr *)pshdr;
38*4882a593Smuzhiyun udph = (struct udphdr *)(ip4h + 1);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun ip4h->ttl = 0xff;
41*4882a593Smuzhiyun ip4h->check = CSUM_MANGLED_0;
42*4882a593Smuzhiyun ip4h->tos = 0xff;
43*4882a593Smuzhiyun } else { /* IPv6 */
44*4882a593Smuzhiyun memcpy(pshdr, ipv6_hdr(skb), hdr_size);
45*4882a593Smuzhiyun ip6h = (struct ipv6hdr *)pshdr;
46*4882a593Smuzhiyun udph = (struct udphdr *)(ip6h + 1);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun memset(ip6h->flow_lbl, 0xff, sizeof(ip6h->flow_lbl));
49*4882a593Smuzhiyun ip6h->priority = 0xf;
50*4882a593Smuzhiyun ip6h->hop_limit = 0xff;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun udph->check = CSUM_MANGLED_0;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun bth_offset += hdr_size;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun memcpy(&pshdr[bth_offset], pkt->hdr, RXE_BTH_BYTES);
57*4882a593Smuzhiyun bth = (struct rxe_bth *)&pshdr[bth_offset];
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun /* exclude bth.resv8a */
60*4882a593Smuzhiyun bth->qpn |= cpu_to_be32(~BTH_QPN_MASK);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun length = hdr_size + RXE_BTH_BYTES;
63*4882a593Smuzhiyun crc = rxe_crc32(pkt->rxe, crc, pshdr, length);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun /* And finish to compute the CRC on the remainder of the headers. */
66*4882a593Smuzhiyun crc = rxe_crc32(pkt->rxe, crc, pkt->hdr + RXE_BTH_BYTES,
67*4882a593Smuzhiyun rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
68*4882a593Smuzhiyun return crc;
69*4882a593Smuzhiyun }
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