[dpdk-dev] [PATCH] net/bnxt: fix non-vector fast mbuf free offload

[Ajit Khaparde]

On Fri, Oct 9, 2020 at 9:36 AM Lance Richardson
<lance.richardson at broadcom.com> wrote:
>
> The fast mbuf free offload for non-vector mode requires
> additional checks in order to handle long tx buffer
> descriptors, so dedicated functions are needed for
> vector- and non-vector-modes.
>
> Fixes: 103169df2880 ("net/bnxt: support fast mbuf free")
> Signed-off-by: Lance Richardson <lance.richardson at broadcom.com>
> Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde at broadcom.com>
Patch applied to dpdk-next-net-brcm/for-next-net with updated the commit id.

> ---
>  drivers/net/bnxt/bnxt_rxtx_vec_common.h | 27 ++++++++++++++++++++
>  drivers/net/bnxt/bnxt_rxtx_vec_neon.c   |  2 +-
>  drivers/net/bnxt/bnxt_rxtx_vec_sse.c    |  2 +-
>  drivers/net/bnxt/bnxt_txr.c             | 34 +++++++++++++++++++++++++
>  drivers/net/bnxt/bnxt_txr.h             | 27 --------------------
>  5 files changed, 63 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_common.h b/drivers/net/bnxt/bnxt_rxtx_vec_common.h
> index 33ac53568..d540e9eee 100644
> --- a/drivers/net/bnxt/bnxt_rxtx_vec_common.h
> +++ b/drivers/net/bnxt/bnxt_rxtx_vec_common.h
> @@ -95,6 +95,33 @@ bnxt_rxq_rearm(struct bnxt_rx_queue *rxq, struct bnxt_rx_ring_info *rxr)
>         rxq->rxrearm_nb -= nb;
>  }
>
> +/*
> + * Transmit completion function for use when DEV_TX_OFFLOAD_MBUF_FAST_FREE
> + * is enabled.
> + */
> +static inline void
> +bnxt_tx_cmp_vec_fast(struct bnxt_tx_queue *txq, int nr_pkts)
> +{
> +       struct bnxt_tx_ring_info *txr = txq->tx_ring;
> +       uint32_t ring_mask = txr->tx_ring_struct->ring_mask;
> +       struct rte_mbuf **free = txq->free;
> +       uint16_t cons = txr->tx_cons;
> +       unsigned int blk = 0;
> +
> +       while (nr_pkts--) {
> +               struct bnxt_sw_tx_bd *tx_buf;
> +
> +               tx_buf = &txr->tx_buf_ring[cons];
> +               cons = (cons + 1) & ring_mask;
> +               free[blk++] = tx_buf->mbuf;
> +               tx_buf->mbuf = NULL;
> +       }
> +       if (blk)
> +               rte_mempool_put_bulk(free[0]->pool, (void **)free, blk);
> +
> +       txr->tx_cons = cons;
> +}
> +
>  static inline void
>  bnxt_tx_cmp_vec(struct bnxt_tx_queue *txq, int nr_pkts)
>  {
> diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_neon.c b/drivers/net/bnxt/bnxt_rxtx_vec_neon.c
> index 4c04cc43a..f49e29ccb 100644
> --- a/drivers/net/bnxt/bnxt_rxtx_vec_neon.c
> +++ b/drivers/net/bnxt/bnxt_rxtx_vec_neon.c
> @@ -369,7 +369,7 @@ bnxt_handle_tx_cp_vec(struct bnxt_tx_queue *txq)
>         cpr->valid = !!(raw_cons & cp_ring_struct->ring_size);
>         if (nb_tx_pkts) {
>                 if (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
> -                       bnxt_tx_cmp_fast(txq, nb_tx_pkts);
> +                       bnxt_tx_cmp_vec_fast(txq, nb_tx_pkts);
>                 else
>                         bnxt_tx_cmp_vec(txq, nb_tx_pkts);
>                 cpr->cp_raw_cons = raw_cons;
> diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> index f71f46985..e4ba63551 100644
> --- a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> +++ b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> @@ -340,7 +340,7 @@ bnxt_handle_tx_cp_vec(struct bnxt_tx_queue *txq)
>         cpr->valid = !!(raw_cons & cp_ring_struct->ring_size);
>         if (nb_tx_pkts) {
>                 if (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
> -                       bnxt_tx_cmp_fast(txq, nb_tx_pkts);
> +                       bnxt_tx_cmp_vec_fast(txq, nb_tx_pkts);
>                 else
>                         bnxt_tx_cmp_vec(txq, nb_tx_pkts);
>                 cpr->cp_raw_cons = raw_cons;
> diff --git a/drivers/net/bnxt/bnxt_txr.c b/drivers/net/bnxt/bnxt_txr.c
> index 125ac8341..fb358d6f1 100644
> --- a/drivers/net/bnxt/bnxt_txr.c
> +++ b/drivers/net/bnxt/bnxt_txr.c
> @@ -337,6 +337,40 @@ static uint16_t bnxt_start_xmit(struct rte_mbuf *tx_pkt,
>         return 0;
>  }
>
> +/*
> + * Transmit completion function for use when DEV_TX_OFFLOAD_MBUF_FAST_FREE
> + * is enabled.
> + */
> +static void bnxt_tx_cmp_fast(struct bnxt_tx_queue *txq, int nr_pkts)
> +{
> +       struct bnxt_tx_ring_info *txr = txq->tx_ring;
> +       struct rte_mbuf **free = txq->free;
> +       uint16_t cons = txr->tx_cons;
> +       unsigned int blk = 0;
> +       int i, j;
> +
> +       for (i = 0; i < nr_pkts; i++) {
> +               struct bnxt_sw_tx_bd *tx_buf;
> +               unsigned short nr_bds;
> +
> +               tx_buf = &txr->tx_buf_ring[cons];
> +               nr_bds = tx_buf->nr_bds;
> +               for (j = 0; j < nr_bds; j++) {
> +                       if (tx_buf->mbuf) {
> +                               /* Add mbuf to the bulk free array */
> +                               free[blk++] = tx_buf->mbuf;
> +                               tx_buf->mbuf = NULL;
> +                       }
> +                       cons = RING_NEXT(txr->tx_ring_struct, cons);
> +                       tx_buf = &txr->tx_buf_ring[cons];
> +               }
> +       }
> +       if (blk)
> +               rte_mempool_put_bulk(free[0]->pool, (void *)free, blk);
> +
> +       txr->tx_cons = cons;
> +}
> +
>  static void bnxt_tx_cmp(struct bnxt_tx_queue *txq, int nr_pkts)
>  {
>         struct bnxt_tx_ring_info *txr = txq->tx_ring;
> diff --git a/drivers/net/bnxt/bnxt_txr.h b/drivers/net/bnxt/bnxt_txr.h
> index c0b1fde22..d241227d4 100644
> --- a/drivers/net/bnxt/bnxt_txr.h
> +++ b/drivers/net/bnxt/bnxt_txr.h
> @@ -44,33 +44,6 @@ static inline uint32_t bnxt_tx_avail(struct bnxt_tx_queue *txq)
>                  bnxt_tx_bds_in_hw(txq)) - 1);
>  }
>
> -/*
> - * Transmit completion function for use when DEV_TX_OFFLOAD_MBUF_FAST_FREE
> - * is enabled.
> - */
> -static inline void
> -bnxt_tx_cmp_fast(struct bnxt_tx_queue *txq, int nr_pkts)
> -{
> -       struct bnxt_tx_ring_info *txr = txq->tx_ring;
> -       uint32_t ring_mask = txr->tx_ring_struct->ring_mask;
> -       struct rte_mbuf **free = txq->free;
> -       uint16_t cons = txr->tx_cons;
> -       unsigned int blk = 0;
> -
> -       while (nr_pkts--) {
> -               struct bnxt_sw_tx_bd *tx_buf;
> -
> -               tx_buf = &txr->tx_buf_ring[cons];
> -               cons = (cons + 1) & ring_mask;
> -               free[blk++] = tx_buf->mbuf;
> -               tx_buf->mbuf = NULL;
> -       }
> -       if (blk)
> -               rte_mempool_put_bulk(free[0]->pool, (void **)free, blk);
> -
> -       txr->tx_cons = cons;
> -}
> -
>  void bnxt_free_tx_rings(struct bnxt *bp);
>  int bnxt_init_one_tx_ring(struct bnxt_tx_queue *txq);
>  int bnxt_init_tx_ring_struct(struct bnxt_tx_queue *txq, unsigned int socket_id);
> --
> 2.25.1
>