Hi， qi
> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Wednesday, June 27, 2018 4:11 PM
> To: Zhao1, Wei <wei.zh...@intel.com>; dev@dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo...@intel.com>
> Subject: RE: [PATCH v4] net/fm10k: add support for check descriptor status
> APIs
>
> Hi Wei:
>
> > -----Original Message-----
> > From: Zhao1, Wei
> > Sent: Friday, June 22, 2018 4:20 PM
> > To: dev@dpdk.org
> > Cc: Lu, Wenzhuo <wenzhuo...@intel.com>; Zhang, Qi Z
> > <qi.z.zh...@intel.com>; Zhao1, Wei <wei.zh...@intel.com>
> > Subject: [PATCH v4] net/fm10k: add support for check descriptor status
> > APIs
> >
> > Fm10k nic need to support check descriptor status APIs, they are
> > rte_eth_rx_descriptor_status and rte_eth_tx_descriptor_status.
> > So, this patch add ops with function pointer that enable feature.
> >
> > Signed-off-by: Wei Zhao <wei.zh...@intel.com>
> >
> > ---
> >
> > v2:
> > -fix DD check error in tx descriptor
> >
> > v3:
> > -fix DD check index error
> >
> > v4:
> > -fix error in RS bit list poll
> >
> > ---
> > ---
> > doc/guides/rel_notes/release_18_08.rst | 6 +++
> > drivers/net/fm10k/fm10k.h | 7 +++
> > drivers/net/fm10k/fm10k_ethdev.c | 2 +
> > drivers/net/fm10k/fm10k_rxtx.c | 78
> > ++++++++++++++++++++++++++++++++++
> > 4 files changed, 93 insertions(+)
> >
> > diff --git a/doc/guides/rel_notes/release_18_08.rst
> > b/doc/guides/rel_notes/release_18_08.rst
> > index 5bc23c5..5baa09e 100644
> > --- a/doc/guides/rel_notes/release_18_08.rst
> > +++ b/doc/guides/rel_notes/release_18_08.rst
> > @@ -41,6 +41,12 @@ New Features
> > Also, make sure to start the actual text at the margin.
> >
> =========================================================
> >
> > +* **Added fm10k ethernet driver to support check descriptor status
> > +APIs.**
> > +
> > + Fm10k nic need to support check descriptor status APIs, they are
> > + rte_eth_rx_descriptor_status and rte_eth_tx_descriptor_status.
> > + add ops pointer with new function which enable feature.
> > +
> >
> > API Changes
> > -----------
> > diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
> > index
> > ef30780..1bc2c18 100644
> > --- a/drivers/net/fm10k/fm10k.h
> > +++ b/drivers/net/fm10k/fm10k.h
> > @@ -329,6 +329,13 @@ uint16_t fm10k_recv_scattered_pkts(void
> > *rx_queue, int fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t
> > offset);
> >
> > +int
> > +fm10k_dev_rx_descriptor_status(void *rx_queue, uint16_t offset);
> > +
> > +int
> > +fm10k_dev_tx_descriptor_status(void *rx_queue, uint16_t offset);
> > +
> > +
> > uint16_t fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
> > uint16_t nb_pkts);
> >
> > diff --git a/drivers/net/fm10k/fm10k_ethdev.c
> > b/drivers/net/fm10k/fm10k_ethdev.c
> > index 3ff1b0e..ea2f2bf 100644
> > --- a/drivers/net/fm10k/fm10k_ethdev.c
> > +++ b/drivers/net/fm10k/fm10k_ethdev.c
> > @@ -2837,6 +2837,8 @@ static const struct eth_dev_ops
> > fm10k_eth_dev_ops = {
> > .tx_queue_setup = fm10k_tx_queue_setup,
> > .tx_queue_release = fm10k_tx_queue_release,
> > .rx_descriptor_done = fm10k_dev_rx_descriptor_done,
> > + .rx_descriptor_status = fm10k_dev_rx_descriptor_status,
> > + .tx_descriptor_status = fm10k_dev_tx_descriptor_status,
> > .rx_queue_intr_enable = fm10k_dev_rx_queue_intr_enable,
> > .rx_queue_intr_disable = fm10k_dev_rx_queue_intr_disable,
> > .reta_update = fm10k_reta_update,
> > diff --git a/drivers/net/fm10k/fm10k_rxtx.c
> > b/drivers/net/fm10k/fm10k_rxtx.c index 9320748..daa2b32 100644
> > --- a/drivers/net/fm10k/fm10k_rxtx.c
> > +++ b/drivers/net/fm10k/fm10k_rxtx.c
> > @@ -389,6 +389,84 @@ fm10k_dev_rx_descriptor_done(void *rx_queue,
> > uint16_t offset)
> > return ret;
> > }
> >
> > +int
> > +fm10k_dev_rx_descriptor_status(void *rx_queue, uint16_t offset) {
> > + volatile union fm10k_rx_desc *rxdp;
> > + struct fm10k_rx_queue *rxq = rx_queue;
> > + uint16_t nb_hold, trigger_last;
> > + uint16_t desc;
> > + int ret;
> > +
> > + if (unlikely(offset >= rxq->nb_desc)) {
> > + PMD_DRV_LOG(ERR, "Invalid RX descriptor offset %u",
> offset);
> > + return 0;
> > + }
> > +
> > + if (rxq->next_trigger < rxq->alloc_thresh)
> > + trigger_last = rxq->next_trigger +
> > + rxq->nb_desc - rxq->alloc_thresh;
> > + else
> > + trigger_last = rxq->next_trigger - rxq->alloc_thresh;
> > +
> > + if (rxq->next_dd < trigger_last)
> > + nb_hold = rxq->next_dd + rxq->nb_desc - trigger_last;
> > + else
> > + nb_hold = rxq->next_dd - trigger_last;
> > +
> > + if (offset >= rxq->nb_desc - nb_hold)
> > + return RTE_ETH_RX_DESC_UNAVAIL;
> > +
> > + desc = rxq->next_dd + offset;
> > + if (desc >= rxq->nb_desc)
> > + desc -= rxq->nb_desc;
> > +
> > + rxdp = &rxq->hw_ring[desc];
> > +
> > + ret = !!(rxdp->w.status &
> > + rte_cpu_to_le_16(FM10K_RXD_STATUS_DD));
> > +
> > + return ret;
> > +}
> > +
> > +int
> > +fm10k_dev_tx_descriptor_status(void *tx_queue, uint16_t offset) {
> > + volatile struct fm10k_tx_desc *txdp;
> > + struct fm10k_tx_queue *txq = tx_queue;
> > + uint16_t desc;
> > + uint16_t count, next_rs = txq->nb_desc;
> > + struct fifo rs_tracker = txq->rs_tracker;
> > + struct fifo *r = &rs_tracker;
> > +
> > + if (unlikely(offset >= txq->nb_desc))
> > + return -EINVAL;
> > +
> > + desc = txq->next_free + offset;
> > + /* go to next desc that has the RS bit */
> > + desc = (desc / txq->rs_thresh + 1) *
> > + txq->rs_thresh - 1;
> > +
> > + if (desc >= txq->nb_desc) {
> > + desc -= txq->nb_desc;
> > + if (desc >= txq->nb_desc)
> > + desc -= txq->nb_desc;
> > + }
> > +
> > + r->head = r->list;
> > + for (count = 0; r->head != r->endp; count++) {
>
> I didn't see the necessary to have "count" here.
>
> Others I didn't see issue, btw, could you rebase on dpdk-next-net-intel?
Ok， I will commit v5 later.
>
> Thanks
> Qi
>
>
> > + if (*r->head >= desc && *r->head < next_rs)
> > + next_rs = *r->head;
> > + ++r->head;
> > + }
> > +
> > + txdp = &txq->hw_ring[next_rs];
> > + if (txdp->flags & FM10K_TXD_FLAG_DONE)
> > + return RTE_ETH_TX_DESC_DONE;
> > +
> > + return RTE_ETH_TX_DESC_FULL;
> > +}
> > +
> > /*
> > * Free multiple TX mbuf at a time if they are in the same pool
> > *
> > --
> > 2.7.5
