Re: [dpdk-users] To enable offloading DEV_TX_OFFLOAD_MULTI_SEGS per port and per queue

[Shyam Shrivastav <shrivastav.shyam@gmail.com>]

The particular offload might be pure per port rather than per queue, anyway
you are enabling it at port level so no need to enable per queue.

Documentation is available at
http://doc.dpdk.org/guides/prog_guide/poll_mode_drv.html , some relevant
excerpt

The dev_info->[rt]x_queue_offload_capa returned from rte_eth_dev_info_get()
includes all per-queue offloading capabilities. The
dev_info->[rt]x_offload_capa returned from rte_eth_dev_info_get() includes
all pure per-port and per-queue offloading capabilities. Supported offloads
can be either per-port or per-queue.



On Mon, Apr 8, 2019 at 7:18 AM Anupama Laxmi <anupamalaxmi4@gmail.com>
wrote:

> I would like to enable per port offloading to set TX offloading for
> multiple segments using DEV_TX_OFFLOAD_MULTI_SEGS. UDP packets were getting
> dropped with error Bad UDP length > IP payload length as seen in the
> wireshark capture. This issue is seen after I upgraded to DPDK 18.08. Hence
> I would like to set the offload DEV_TX_OFFLOAD_MULTI_SEGS per port to allow
> segmenation of big packets.
>
> I am getting the below error when I try to set the above offload.
>
> Ethdev port_id=0 tx_queue_id=0, new added offloads 0x9f3e55 must be within
> pre-queue offload capabilities 0x0 in rte_eth_tx_queue_setup()
>
> Please let me know where I am going wrong and how do I set the offload
> DEV_TX_OFFLOAD_MULTI_SEGS correctly.
>
> 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,
> };
>
>
> static struct rte_eth_conf port_conf = {
>         .rxmode = {
>                 .mq_mode = ETH_MQ_RX_RSS,
>                 .max_rx_pkt_len = JUMBO_FRAME_MAX_SIZE,
>                 .split_hdr_size = 0,
>                 .offloads = (DEV_RX_OFFLOAD_CHECKSUM |
>                              DEV_RX_OFFLOAD_CRC_STRIP),
>         },
>         .rx_adv_conf = {
>                 .rss_conf = {
>                         .rss_key = NULL,
>                         .rss_hf = ETH_RSS_TCP| ETH_RSS_UDP |
>                              ETH_RSS_TCP | ETH_RSS_SCTP,
>                 },
>         },
>         .txmode = {
>                 .mq_mode = ETH_MQ_TX_NONE,
>         },
> };
>
>
> struct rte_eth_txconf *tx_conf;
> struct rte_eth_conf local_port_conf = port_conf;
> if(dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MULTI_SEGS)
>         {
>
>            local_port_conf.txmode.offloads |= DEV_TX_OFFLOAD_MULTI_SEGS;
>         }
> ret = rte_eth_dev_configure(port, nbqueue, nbqueue, &local_port_conf);
> rte_eth_dev_info_get(port, &dev_info);
>         tx_conf = &dev_info.default_txconf;
>         tx_conf->offloads = local_port_conf.txmode.offloads;
>
>         ret = rte_eth_tx_queue_setup(port, queue, RTE_TEST_TX_DESC_DEFAULT,
> master_socket_id, &tx_conf);
>