[dpdk-dev] [PATCH v2] test/bpf: use hton instead of _builtin_bswap
Ananyev, Konstantin
konstantin.ananyev at intel.com
Tue Nov 6 11:17:58 CET 2018
Hi Malvika,
> -----Original Message-----
> From: Malvika Gupta [mailto:malvika.gupta at arm.com]
> Sent: Friday, November 2, 2018 7:08 PM
> To: Ananyev, Konstantin <konstantin.ananyev at intel.com>
> Cc: dev at dpdk.org; gavin.hu at arm.com; honnappa.nagarahalli at arm.com; nd at arm.com; Malvika Gupta <Malvika.Gupta at arm.com>;
> Malvika Gupta <malvika.gupta at arm.com>
> Subject: [PATCH v2] test/bpf: use hton instead of _builtin_bswap
>
> From: Malvika Gupta <Malvika.Gupta at arm.com>
>
> Convert host machine endianness to networking endianness for
> comparison of incoming packets with BPF filter
>
> Suggested-by: Brian Brooks <brian.brooks at arm.com>
> Signed-off-by: Malvika Gupta <malvika.gupta at arm.com>
> Reviewed-by: Gavin Hu <gavin.hu at arm.com>
> Reviewed-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
I don't remember I acked it before actually, but I am ok to do it now for v2.
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
> Acked-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> ---
> v2:
> * Correct compilation command in the comments for x86.
> * Added compilation command for ARM.
>
> ---
> test/bpf/t1.c | 14 +++++++++-----
> test/bpf/t3.c | 13 ++++++++++---
> 2 files changed, 19 insertions(+), 8 deletions(-)
>
> diff --git a/test/bpf/t1.c b/test/bpf/t1.c
> index 60f9434ab..3364b4f1e 100644
> --- a/test/bpf/t1.c
> +++ b/test/bpf/t1.c
> @@ -20,32 +20,36 @@
> * (011) ret #1
> * (012) ret #0
> *
> - * To compile:
> - * clang -O2 -target bpf -c t1.c
> + * To compile on x86:
> + * clang -O2 -U __GNUC__ -target bpf -c t1.c
> + *
> + * To compile on ARM:
> + * clang -O2 -I/usr/include/aarch64-linux-gnu/ -target bpf -c t1.c
> */
>
> #include <stdint.h>
> #include <net/ethernet.h>
> #include <netinet/ip.h>
> #include <netinet/udp.h>
> +#include <arpa/inet.h>
>
> uint64_t
> entry(void *pkt)
> {
> struct ether_header *ether_header = (void *)pkt;
>
> - if (ether_header->ether_type != __builtin_bswap16(0x0800))
> + if (ether_header->ether_type != htons(0x0800))
> return 0;
>
> struct iphdr *iphdr = (void *)(ether_header + 1);
> if (iphdr->protocol != 17 || (iphdr->frag_off & 0x1ffff) != 0 ||
> - iphdr->daddr != __builtin_bswap32(0x1020304))
> + iphdr->daddr != htonl(0x1020304))
> return 0;
>
> int hlen = iphdr->ihl * 4;
> struct udphdr *udphdr = (void *)iphdr + hlen;
>
> - if (udphdr->dest != __builtin_bswap16(5000))
> + if (udphdr->dest != htons(5000))
> return 0;
>
> return 1;
> diff --git a/test/bpf/t3.c b/test/bpf/t3.c
> index 531b9cb8c..9ba34638a 100644
> --- a/test/bpf/t3.c
> +++ b/test/bpf/t3.c
> @@ -6,9 +6,15 @@
> * eBPF program sample.
> * Accepts pointer to struct rte_mbuf as an input parameter.
> * Dump the mbuf into stdout if it is an ARP packet (aka tcpdump 'arp').
> - * To compile:
> - * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
> + *
> + * To compile on x86:
> + * clang -O2 -U __GNUC__ -I${RTE_SDK}/${RTE_TARGET}/include \
> * -target bpf -Wno-int-to-void-pointer-cast -c t3.c
> + *
> + * To compile on ARM:
> + * clang -O2 -I/usr/include/aarch64-linux-gnu \
> + * -I${RTE_SDK}/${RTE_TARGET}/include -target bpf \
> + * -Wno-int-to-void-pointer-cast -c t3.c
> */
>
> #include <stdint.h>
> @@ -17,6 +23,7 @@
> #include <net/ethernet.h>
> #include <rte_config.h>
> #include "mbuf.h"
> +#include <arpa/inet.h>
>
> extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);
>
> @@ -29,7 +36,7 @@ entry(const void *pkt)
> mb = pkt;
> eth = rte_pktmbuf_mtod(mb, const struct ether_header *);
>
> - if (eth->ether_type == __builtin_bswap16(ETHERTYPE_ARP))
> + if (eth->ether_type == htons(ETHERTYPE_ARP))
> rte_pktmbuf_dump(stdout, mb, 64);
>
> return 1;
> --
> 2.17.1
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