[PATCH rdma-next 24/29] IB/rxe: Invariant CRC implementation

Moni Shoua
2016-06-02T16:57:32Z

Compute and match ICRC as defined in spec for sent and received packets.

Signed-off-by: Kamal Heib <kamalh-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/rxe/rxe_icrc.c | 96 ++++++++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
create mode 100644 drivers/infiniband/hw/rxe/rxe_icrc.c

diff --git a/drivers/infiniband/hw/rxe/rxe_icrc.c b/drivers/infiniband/hw/rxe/rxe_icrc.c
new file mode 100644
index 0000000..413b56b
--- /dev/null
+++ b/drivers/infiniband/hw/rxe/rxe_icrc.c
@@ -0,0 +1,96 @@
+/*
+ * 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;
+}
--
1.8.3.1