[dpdk-stable] patch 'examples/l2fwd-crypto: fix padding' has been queued to LTS release 16.11.3

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to LTS release 16.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/27/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From db9af4dc38c3bced06ca4cb7a2fa8550071a2a79 Mon Sep 17 00:00:00 2001
From: Pablo de Lara <pablo.de.lara.guarch at intel.com>
Date: Thu, 9 Feb 2017 12:27:45 +0000
Subject: [PATCH] examples/l2fwd-crypto: fix padding

[ backported from upstream commit 5839fd20e7323850f3a411d9b5642d914fa2d3f0 ]

L2fwd-crypto app was padding an incoming buffer,
to be aligned with the algorithm block size, in all cases.
This was not the right approach, as padding is only necessary
when using block cipher algorithms, such as AES-CBC.
In case of using a stream cipher algorithm, such as SNOW3G UEA2,
there is no need to include padding and increase the buffer size.

Fixes: 387259bd6c67 ("examples/l2fwd-crypto: add sample application")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
Acked-by: Fan Zhang <roy.fan.zhang at intel.com>
---
 examples/l2fwd-crypto/main.c | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/examples/l2fwd-crypto/main.c b/examples/l2fwd-crypto/main.c
index 91d2c41..b40c49c 100644
--- a/examples/l2fwd-crypto/main.c
+++ b/examples/l2fwd-crypto/main.c
@@ -432,7 +432,8 @@ l2fwd_simple_crypto_enqueue(struct rte_mbuf *m,
 	struct ether_hdr *eth_hdr;
 	struct ipv4_hdr *ip_hdr;
 
-	unsigned ipdata_offset, pad_len, data_len;
+	uint32_t ipdata_offset, data_len;
+	uint32_t pad_len = 0;
 	char *padding;
 
 	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
@@ -455,16 +456,32 @@ l2fwd_simple_crypto_enqueue(struct rte_mbuf *m,
 	if (cparams->do_hash && cparams->hash_verify)
 		data_len -= cparams->digest_length;
 
-	pad_len = data_len % cparams->block_size ? cparams->block_size -
-			(data_len % cparams->block_size) : 0;
+	if (cparams->do_cipher) {
+		/*
+		 * Following algorithms are block cipher algorithms,
+		 * and might need padding
+		 */
+		switch (cparams->cipher_algo) {
+		case RTE_CRYPTO_CIPHER_AES_CBC:
+		case RTE_CRYPTO_CIPHER_AES_ECB:
+		case RTE_CRYPTO_CIPHER_3DES_CBC:
+		case RTE_CRYPTO_CIPHER_3DES_ECB:
+			if (data_len % cparams->block_size)
+				pad_len = cparams->block_size -
+					(data_len % cparams->block_size);
+			break;
+		default:
+			pad_len = 0;
+		}
 
-	if (pad_len) {
-		padding = rte_pktmbuf_append(m, pad_len);
-		if (unlikely(!padding))
-			return -1;
+		if (pad_len) {
+			padding = rte_pktmbuf_append(m, pad_len);
+			if (unlikely(!padding))
+				return -1;
 
-		data_len += pad_len;
-		memset(padding, 0, pad_len);
+			data_len += pad_len;
+			memset(padding, 0, pad_len);
+		}
 	}
 
 	/* Set crypto operation data parameters */
-- 
2.7.4