[dpdk-dev] [PATCH] examples: add ip version check for l3fwd app
Chilikin, Andrey
andrey.chilikin at intel.com
Wed Jun 3 10:24:42 CEST 2015
> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> Sent: Wednesday, June 3, 2015 9:17 AM
> To: Chilikin, Andrey
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] examples: add ip version check for l3fwd app
>
> 2015-05-15 17:08, Andrey Chilikin:
> > Added optional ip version check to l3fwd app to allow to detect the ip
> > version if mbuf ol_flags are not set in case of running in a VM with
> > emulated network controllers
> >
> > Signed-off-by: Andrey Chilikin <andrey.chilikin at intel.com>
> [...]
> > +#define DO_IP_VERSION_CHECK 0
> [...]
> > @@ -953,6 +955,15 @@ l3fwd_simple_forward(struct rte_mbuf *m, uint8_t
> portid, struct lcore_conf *qcon
> > void *d_addr_bytes;
> > uint8_t dst_port;
> >
> > +#if DO_IP_VERSION_CHECK
> > + if (!(m->ol_flags & (PKT_RX_IPV4_HDR | PKT_RX_IPV6_HDR))) {
> > + uint8_t ip_ver = *(uint8_t *)(rte_pktmbuf_mtod(m, unsigned
> char *) +
> > + sizeof(struct ether_hdr)) >> 4;
> > + if (ip_ver == 4)
> > + m->ol_flags |= PKT_RX_IPV4_HDR;
> > + }
> > +#endif
>
> You are adding dead code. When ol_flags will be updated, it will be forget until
> someone enables it.
> In general, compile-time configurations are avoided and it's even worst when
> this is hidden and not easily testable like here.
Agree, we already thinking about creating separate example l3fwd-vm to cover emulated network controllers.
Thanks,
Andrey
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