[PATCH v5] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

Updated the if-else block with an optimised inverse operator. Thanks
for your suggestion Stephen.

On Fri, Aug 2, 2024 at 10:36 AM Tathagat Priyadarshi
<tathagat.dpdk at gmail.com> wrote:
>
> The EOP and csum bit was not set for all the packets in mbuf chain
> causing packet transmission stalls for packets split across
> mbuf in chain.
>
> Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
> Cc: stable at dpdk.org
>
> Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk at gmail.com>
> Signed-off-by: Varun Lakkur Ambaji Rao <varun.la at gmail.com>
>
> Acked-by: Joshua Washington <joshwash at google.com>
> ---
>  drivers/net/gve/gve_tx_dqo.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
> index a65e6aa..bbaf46d 100644
> --- a/drivers/net/gve/gve_tx_dqo.c
> +++ b/drivers/net/gve/gve_tx_dqo.c
> @@ -89,6 +89,7 @@
>         uint16_t sw_id;
>         uint64_t bytes;
>         uint16_t first_sw_id;
> +       uint8_t csum;
>
>         sw_ring = txq->sw_ring;
>         txr = txq->tx_ring;
> @@ -114,6 +115,9 @@
>                 ol_flags = tx_pkt->ol_flags;
>                 nb_used = tx_pkt->nb_segs;
>                 first_sw_id = sw_id;
> +
> +               csum = !!(ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO);
> +
>                 do {
>                         if (sw_ring[sw_id] != NULL)
>                                 PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
> @@ -126,6 +130,8 @@
>                         txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
>                         txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
>                         txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
> +                       txd->pkt.end_of_packet = 0;
> +                       txd->pkt.checksum_offload_enable = csum;
>
>                         /* size of desc_ring and sw_ring could be different */
>                         tx_id = (tx_id + 1) & mask;
> @@ -138,9 +144,6 @@
>                 /* fill the last descriptor with End of Packet (EOP) bit */
>                 txd->pkt.end_of_packet = 1;
>
> -               if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
> -                       txd->pkt.checksum_offload_enable = 1;
> -
>                 txq->nb_free -= nb_used;
>                 txq->nb_used += nb_used;
>         }
> --
> 1.8.3.1
>