By default OSA-Express cards use layer3 mode. In that mode LLC headers are removed from incoming IPv4 packets. Using the card in layer2 mode will make it keep the MAC addresses of IPv4 packets.
S wudem amezwer, tikerḍiwin OSA-Express seqdacent askar n tissi3. Deg uskar-a, iqerra LLC ttwakksen seg yikemmusen IPv4 i d-ikecmen. Aseqdec n tkarḍa deg uskar n tissi2 ad t-yerr iḥerrez tansiwin n MAC n yikemmusen IPv4.