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.