82599 TX IP checksum offloading

Hi,
I want NIC to calculate ip checksum on dpdk-1.5.0,

I have set:

static const struct rte_eth_txconf tx_conf = {
	.tx_thresh = {
		.pthresh = TX_PTHRESH,
		.hthresh = TX_HTHRESH,
		.wthresh = TX_WTHRESH,
	},
	.tx_free_thresh = 0, 
	.tx_rs_thresh = 0, 
	.txq_flags = 0,    
};
this struct is used by int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
				  uint16_t nb_tx_desc, unsigned int socket_id,
				  const struct rte_eth_txconf **tx_conf*);

when constructing the pkt will been sending:

mbuf->ol_flags|=(PKT_TX_IP_CKSUM|PKT_RX_IPV4_HDR); |~
mbuf->pkt.vlan_macip.f.l2_len = sizeof(struct ether_hdr); |~
mbuf->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);

but the NIC not calculate ip checksum,did anyone tell me what's wrong whith it? by the way,I create multi-queue for tx and rx.

Thanks,
chen_lp

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chen_Ip,

You shoudln't use PKT_RX_IPV4_HDR, either just PKT_TX_IP_CKSUM or some other combination of PKT_TX_* (e.g. PKT_TX_OFFLOAD_MASK)

Daniel