[dpdk-dev] [PATCH 1/4] net/fm10k: cleanup Tx buffers
Gavin Hu (Arm Technology China)
Gavin.Hu at arm.com
Thu Sep 26 12:37:58 CEST 2019
> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Di ChenxuX
> Sent: Thursday, September 26, 2019 5:30 PM
> To: dev at dpdk.org
> Cc: qiming.yang at intel.com; Di ChenxuX <chenxux.di at intel.com>
> Subject: [dpdk-dev] [PATCH 1/4] net/fm10k: cleanup Tx buffers
>
> Add support to the fm10k driver for the API rte_eth_tx_done_cleanup
> to force free consumed buffers on Tx ring.
>
> Signed-off-by: Di ChenxuX <chenxux.di at intel.com>
> ---
> drivers/net/fm10k/fm10k.h | 2 ++
> drivers/net/fm10k/fm10k_ethdev.c | 1 +
> drivers/net/fm10k/fm10k_rxtx.c | 45
> ++++++++++++++++++++++++++++++++
> 3 files changed, 48 insertions(+)
>
> diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
> index 916b856ac..ddb1d64ec 100644
> --- a/drivers/net/fm10k/fm10k.h
> +++ b/drivers/net/fm10k/fm10k.h
> @@ -342,6 +342,8 @@ uint16_t fm10k_xmit_pkts(void *tx_queue, struct
> rte_mbuf **tx_pkts,
> uint16_t fm10k_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
> uint16_t nb_pkts);
>
> +int fm10k_tx_done_cleanup(void *txq, uint32_t free_cnt);
> +
> int fm10k_rxq_vec_setup(struct fm10k_rx_queue *rxq);
> int fm10k_rx_vec_condition_check(struct rte_eth_dev *);
> void fm10k_rx_queue_release_mbufs_vec(struct fm10k_rx_queue *rxq);
> diff --git a/drivers/net/fm10k/fm10k_ethdev.c
> b/drivers/net/fm10k/fm10k_ethdev.c
> index db4d72129..328468185 100644
> --- a/drivers/net/fm10k/fm10k_ethdev.c
> +++ b/drivers/net/fm10k/fm10k_ethdev.c
> @@ -2838,6 +2838,7 @@ static const struct eth_dev_ops
> fm10k_eth_dev_ops = {
> .reta_query = fm10k_reta_query,
> .rss_hash_update = fm10k_rss_hash_update,
> .rss_hash_conf_get = fm10k_rss_hash_conf_get,
> + .tx_done_cleanup = fm10k_tx_done_cleanup,
> };
>
> static int ftag_check_handler(__rte_unused const char *key,
> diff --git a/drivers/net/fm10k/fm10k_rxtx.c
> b/drivers/net/fm10k/fm10k_rxtx.c
> index 5c3112183..f67c5bf00 100644
> --- a/drivers/net/fm10k/fm10k_rxtx.c
> +++ b/drivers/net/fm10k/fm10k_rxtx.c
> @@ -541,6 +541,51 @@ static inline void tx_free_bulk_mbuf(struct
> rte_mbuf **txep, int num)
> }
> }
>
> +int fm10k_tx_done_cleanup(void *txq, uint32_t free_cnt)
> +{
> + struct fm10k_tx_queue *q = (struct fm10k_tx_queue *)txq;
> + uint16_t next_rs, count = 0;
"count" should be declared as uint32_t to compare against free_cnt.
/Gavin
> +
> + if (q == NULL)
> + return -ENODEV;
> +
> + next_rs = fifo_peek(&q->rs_tracker);
> + if (!(q->hw_ring[next_rs].flags & FM10K_TXD_FLAG_DONE))
> + return count;
> +
> + /* the DONE flag is set on this descriptor so remove the ID
> + * from the RS bit tracker and free the buffers
> + */
> + fifo_remove(&q->rs_tracker);
> +
> + /* wrap around? if so, free buffers from last_free up to but NOT
> + * including nb_desc
> + */
> + if (q->last_free > next_rs) {
> + count = q->nb_desc - q->last_free;
> + tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
> + q->last_free = 0;
> +
> + if (unlikely(count == (int)free_cnt))
> + return count;
> + }
> +
> + /* adjust free descriptor count before the next loop */
> + q->nb_free += count + (next_rs + 1 - q->last_free);
> +
> + /* free buffers from last_free, up to and including next_rs */
> + if (q->last_free <= next_rs) {
> + count = next_rs - q->last_free + 1;
> + tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
> + q->last_free += count;
> + }
> +
> + if (q->last_free == q->nb_desc)
> + q->last_free = 0;
> +
> + return count;
> +}
> +
> static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
> {
> uint16_t next_rs, count = 0;
> --
> 2.17.1
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