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* [dpdk-dev] i40e_xmit_fixed_burst_vec not consider the case rte_mbuf has multiple segments
@ 2020-03-04  7:18 Vic Wang(BJ-RD)
  0 siblings, 0 replies; only message in thread
From: Vic Wang(BJ-RD) @ 2020-03-04  7:18 UTC (permalink / raw)
  To: dev


When I study the code of i40e_xmit_pkts_vec in dpdk, I have some questions for the code.
The i40e_xmit_pkts_vec function calls the i40e_xmit_fixed_burst_vec.
I see it just transmits the tx_pkts one by one, but it doesn’t consider the case the tx_pkts have multiple segments.

In the receive routine, there is the i40e_recv_pkts_scattered_vec to cover the case of multiple segments. Then, if the receive packets with multiple segments forword to the tx queue, how to transmit the packet with multiple segments?
I think the i40e_xmit_pkts_vec function cannot cover it.

>i40e_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
>  uint16_t nb_pkts)
>txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_pkts);
>n = (uint16_t)(txq->nb_tx_desc - tx_id);
>if (nb_commit >= n) {
>tx_backlog_entry(txep, tx_pkts, n);
>for (i = 0; i < n - 1; ++i, ++tx_pkts, ++txdp)
>vtx1(txdp, *tx_pkts, flags);
>vtx1(txdp, *tx_pkts++, rs);
>nb_commit = (uint16_t)(nb_commit - n);
>tx_id = 0;
>txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);
>/* avoid reach the end of ring */
>txdp = &txq->tx_ring[tx_id];
>txep = &txq->sw_ring[tx_id];
>tx_backlog_entry(txep, tx_pkts, nb_commit);
>vtx(txdp, tx_pkts, nb_commit, flags);

If there is any insight for the above, thanks for your comment.

Best Regards!

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