[dpdk-stable] [PATCH v2] examples/l3fwd: fix unaligned memory access

[hgovindh]

Fix unaligned memory access when reading IPv6 header which
leads to segmentation fault by changing aligned memory read
to unaligned memory read.

Bugzilla ID: 279
Fixes: 64d3955de1de ("examples/l3fwd: fix ARM build")
Cc: maciej.czekaj at caviumnetworks.com
Cc: stable at dpdk.org
Signed-off-by: hgovindh <hariprasad.govindharajan at intel.com>
---
V2: Added functions which will do unaligned load based on the
underlying architecture
---
---
 examples/l3fwd/l3fwd_em.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
index fa8f82be6..f2641586b 100644
--- a/examples/l3fwd/l3fwd_em.c
+++ b/examples/l3fwd/l3fwd_em.c
@@ -244,6 +244,29 @@ em_mask_key(void *key, xmm_t mask)
 #error No vector engine (SSE, NEON, ALTIVEC) available, check your toolchain
 #endif
 
+#if defined(RTE_MACHINE_CPUFLAG_SSE2)
+static inline xmm_t
+em_load_key(void *key)
+{
+	return _mm_loadu_si128((__m128i *)(key));
+}
+#elif defined(RTE_MACHINE_CPUFLAG_NEON)
+static inline xmm_t
+em_load_key(void *key)
+{
+	return vld1q_s32((int32_t *)key);
+}
+#elif defined(RTE_MACHINE_CPUFLAG_ALTIVEC)
+static inline xmm_t
+em_load_key(void *key)
+{
+	return vec_ld(0, (xmm_t *)(key));
+}
+#else
+#error No vector engine (SSE, NEON, ALTIVEC) available, check your toolchain
+#endif
+
+
 static inline uint16_t
 em_get_ipv4_dst_port(void *ipv4_hdr, uint16_t portid, void *lookup_struct)
 {
@@ -285,8 +308,7 @@ em_get_ipv6_dst_port(void *ipv6_hdr, uint16_t portid, void *lookup_struct)
 	 * Get part of 5 tuple: dst IP address lower 96 bits
 	 * and src IP address higher 32 bits.
 	 */
-	key.xmm[1] = *(xmm_t *)data1;
-
+	key.xmm[1] = em_load_key(data1);
 	/*
 	 * Get part of 5 tuple: dst port and src port
 	 * and dst IP address higher 32 bits.
-- 
2.22.0