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

Aaron Conole aconole at redhat.com
Thu Jul 25 15:27:56 CEST 2019


hgovindh <hariprasad.govindharajan at intel.com> writes:

> 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>
> ---
>  examples/l3fwd/l3fwd_em.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
> index fa8f82be6..f0c443dae 100644
> --- a/examples/l3fwd/l3fwd_em.c
> +++ b/examples/l3fwd/l3fwd_em.c
> @@ -285,7 +285,7 @@ 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] = _mm_loadu_si128((xmm_t *)data1);

Nak.  Please use a generic unaligned load, rather than an intel specific
one.  Otherwise, supported platforms like arm64 will have broken builds.

Additionally, which chip and compiler did you use to get this error?

>  
>  	/*
>  	 * Get part of 5 tuple: dst port and src port


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