Function t4_eth_xmit

dpdk/drivers/net/cxgbe/sge.c:1038–1242

* t4_eth_xmit - add a packet to an Ethernet Tx queue * @txq: the egress queue * @mbuf: the packet * * Add a packet to an SGE Ethernet Tx queue. Runs with softirqs disabled. */

 * Add a packet to an SGE Ethernet Tx queue.  Runs with softirqs disabled.
 */
int t4_eth_xmit(struct sge_eth_txq *txq, struct rte_mbuf *mbuf,
		uint16_t nb_pkts)
{
	const struct port_info *pi;
	struct cpl_tx_pkt_lso_core *lso;
	struct adapter *adap;
	struct rte_mbuf *m = mbuf;
	struct fw_eth_tx_pkt_wr *wr;
	struct fw_eth_tx_pkt_vm_wr *vmwr;
	struct cpl_tx_pkt_core *cpl;
	struct tx_sw_desc *d;
	dma_addr_t addr[m->nb_segs];
	unsigned int flits, ndesc, cflits;
	int l3hdr_len, l4hdr_len, eth_xtra_len;
	int len, last_desc;
	int should_coal, credits;
	u32 wr_mid;
	u64 cntrl, *end;
	bool v6;
	u32 max_pkt_len;

	/* Reject xmit if queue is stopped */
	if (unlikely(txq->flags & EQ_STOPPED))
		return -(EBUSY);

	/*
	 * The chip min packet length is 10 octets but play safe and reject
	 * anything shorter than an Ethernet header.
	 */
	if (unlikely(m->pkt_len < RTE_ETHER_HDR_LEN)) {
out_free:
		rte_pktmbuf_free(m);
		return 0;
	}

	max_pkt_len = txq->data->mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
	if ((!(m->ol_flags & RTE_MBUF_F_TX_TCP_SEG)) &&
	    (unlikely(m->pkt_len > max_pkt_len)))
		goto out_free;

	pi = txq->data->dev_private;
	adap = pi->adapter;

	cntrl = F_TXPKT_L4CSUM_DIS | F_TXPKT_IPCSUM_DIS;
	/* align the end of coalesce WR to a 512 byte boundary */
	txq->q.coalesce.max = (8 - (txq->q.pidx & 7)) * 8;

	if ((m->ol_flags & RTE_MBUF_F_TX_TCP_SEG) == 0) {
		should_coal = should_tx_packet_coalesce(txq, mbuf, &cflits, adap);
		if (should_coal > 0) {
			if (unlikely(map_mbuf(mbuf, addr) < 0)) {
				dev_warn(adap, "%s: mapping err for coalesce\n",
					 __func__);
				txq->stats.mapping_err++;
				goto out_free;
			}
			return tx_do_packet_coalesce(txq, mbuf, cflits, adap,
						     pi, addr, nb_pkts);