[dpdk-stable] [dpdk-dev] [PATCH] examples/l3fwd: fix unaligned memory access
Burakov, Anatoly
anatoly.burakov at intel.com
Thu Jul 25 16:01:17 CEST 2019
On 25-Jul-19 2:27 PM, Aaron Conole wrote:
> 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?
I have reproduced this error on Intel Xeon E5-2699 and GCC 7.4 (Ubuntu
18.04).
>
>>
>> /*
>> * Get part of 5 tuple: dst port and src port
>
--
Thanks,
Anatoly
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