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From: Bob Pearson <rpearsonhpe@gmail.com>
To: jgg@nvidia.com, zyjzyj2000@gmail.com, linux-rdma@vger.kernel.org
Cc: Bob Pearson <rpearsonhpe@gmail.com>
Subject: [PATCH v2 1/9] RDMA/rxe: Move ICRC checking to a subroutine
Date: Tue,  6 Jul 2021 23:00:33 -0500	[thread overview]
Message-ID: <20210707040040.15434-2-rpearsonhpe@gmail.com> (raw)
In-Reply-To: <20210707040040.15434-1-rpearsonhpe@gmail.com>

Move the code in rxe_recv() that checks the ICRC on incoming packets to a
subroutine rxe_check_icrc() and move that to rxe_icrc.c.

Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
---
 drivers/infiniband/sw/rxe/rxe_icrc.c | 38 ++++++++++++++++++++++++++++
 drivers/infiniband/sw/rxe/rxe_loc.h  |  2 ++
 drivers/infiniband/sw/rxe/rxe_recv.c | 23 ++---------------
 3 files changed, 42 insertions(+), 21 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_icrc.c b/drivers/infiniband/sw/rxe/rxe_icrc.c
index 66b2aad54bb7..d067841214be 100644
--- a/drivers/infiniband/sw/rxe/rxe_icrc.c
+++ b/drivers/infiniband/sw/rxe/rxe_icrc.c
@@ -67,3 +67,41 @@ u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 			rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
 	return crc;
 }
+
+/**
+ * rxe_icrc_check() - Compute ICRC for a packet and compare to the ICRC
+ *		      delivered in the packet.
+ * @skb: packet buffer
+ * @pkt: packet info
+ *
+ * Return: 0 if the values match else an error
+ */
+int rxe_icrc_check(struct sk_buff *skb, struct rxe_pkt_info *pkt)
+{
+	__be32 *icrcp;
+	u32 pkt_icrc;
+	u32 icrc;
+
+	icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
+	pkt_icrc = be32_to_cpu(*icrcp);
+
+	icrc = rxe_icrc_hdr(pkt, skb);
+	icrc = rxe_crc32(pkt->rxe, icrc, (u8 *)payload_addr(pkt),
+				payload_size(pkt) + bth_pad(pkt));
+	icrc = (__force u32)cpu_to_be32(~icrc);
+
+	if (unlikely(icrc != pkt_icrc)) {
+		if (skb->protocol == htons(ETH_P_IPV6))
+			pr_warn_ratelimited("bad ICRC from %pI6c\n",
+					    &ipv6_hdr(skb)->saddr);
+		else if (skb->protocol == htons(ETH_P_IP))
+			pr_warn_ratelimited("bad ICRC from %pI4\n",
+					    &ip_hdr(skb)->saddr);
+		else
+			pr_warn_ratelimited("bad ICRC from unknown\n");
+
+		return -EINVAL;
+	}
+
+	return 0;
+}
diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
index 1ddb20855dee..015777e31ec9 100644
--- a/drivers/infiniband/sw/rxe/rxe_loc.h
+++ b/drivers/infiniband/sw/rxe/rxe_loc.h
@@ -193,7 +193,9 @@ int rxe_completer(void *arg);
 int rxe_requester(void *arg);
 int rxe_responder(void *arg);
 
+/* rxe_icrc.c */
 u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb);
+int rxe_icrc_check(struct sk_buff *skb, struct rxe_pkt_info *pkt);
 
 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb);
 
diff --git a/drivers/infiniband/sw/rxe/rxe_recv.c b/drivers/infiniband/sw/rxe/rxe_recv.c
index 7a49e27da23a..6a6cc1fa90e4 100644
--- a/drivers/infiniband/sw/rxe/rxe_recv.c
+++ b/drivers/infiniband/sw/rxe/rxe_recv.c
@@ -361,8 +361,6 @@ void rxe_rcv(struct sk_buff *skb)
 	int err;
 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 	struct rxe_dev *rxe = pkt->rxe;
-	__be32 *icrcp;
-	u32 calc_icrc, pack_icrc;
 
 	if (unlikely(skb->len < RXE_BTH_BYTES))
 		goto drop;
@@ -384,26 +382,9 @@ void rxe_rcv(struct sk_buff *skb)
 	if (unlikely(err))
 		goto drop;
 
-	/* Verify ICRC */
-	icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
-	pack_icrc = be32_to_cpu(*icrcp);
-
-	calc_icrc = rxe_icrc_hdr(pkt, skb);
-	calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
-			      payload_size(pkt) + bth_pad(pkt));
-	calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
-	if (unlikely(calc_icrc != pack_icrc)) {
-		if (skb->protocol == htons(ETH_P_IPV6))
-			pr_warn_ratelimited("bad ICRC from %pI6c\n",
-					    &ipv6_hdr(skb)->saddr);
-		else if (skb->protocol == htons(ETH_P_IP))
-			pr_warn_ratelimited("bad ICRC from %pI4\n",
-					    &ip_hdr(skb)->saddr);
-		else
-			pr_warn_ratelimited("bad ICRC from unknown\n");
-
+	err = rxe_icrc_check(skb, pkt);
+	if (unlikely(err))
 		goto drop;
-	}
 
 	rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
 
-- 
2.30.2


  reply	other threads:[~2021-07-07  4:01 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07  4:00 [PATCH for-next v2 0/9] ICRC cleanup Bob Pearson
2021-07-07  4:00 ` Bob Pearson [this message]
2021-07-13  7:27   ` [PATCH v2 1/9] RDMA/rxe: Move ICRC checking to a subroutine Zhu Yanjun
2021-07-16 15:55   ` Jason Gunthorpe
2021-07-07  4:00 ` [PATCH v2 2/9] RDMA/rxe: Move rxe_xmit_packet " Bob Pearson
2021-07-14  3:24   ` Zhu Yanjun
2021-07-07  4:00 ` [PATCH v2 3/9] RDMA/rxe: Fixup rxe_send and rxe_loopback Bob Pearson
2021-07-07  4:00 ` [PATCH v2 4/9] RDMA/rxe: Move ICRC generation to a subroutine Bob Pearson
2021-07-16 15:57   ` Jason Gunthorpe
2021-07-16 16:08     ` Bob Pearson
2021-07-16 16:29       ` Jason Gunthorpe
2021-07-16 16:38         ` Pearson, Robert B
2021-07-07  4:00 ` [PATCH v2 5/9] RDMA/rxe: Move rxe_crc32 " Bob Pearson
2021-07-07  4:00 ` [PATCH v2 6/9] RDMA/rxe: Fixup rxe_icrc_hdr Bob Pearson
2021-07-07  4:00 ` [PATCH v2 7/9] RDMA/rxe: Move crc32 init code to rxe_icrc.c Bob Pearson
2021-07-07  4:00 ` [PATCH v2 8/9] RDMA/rxe: Add kernel-doc comments " Bob Pearson
2021-07-07  4:00 ` [PATCH v2 9/9] RDMA/rxe: Fix types in rxe_icrc.c Bob Pearson
2021-07-16 16:06   ` Jason Gunthorpe
2021-07-08  7:36 ` [PATCH for-next v2 0/9] ICRC cleanup Zhu Yanjun
2021-07-16 17:38 ` Jason Gunthorpe
2021-07-19  8:42   ` Zhu Yanjun
2021-07-19 15:53     ` Olga Kornievskaia
2021-07-19 17:10       ` Jason Gunthorpe
2021-07-19 21:26         ` Bob Pearson

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