Re: [dpdk-dev] [PATCH v1] eventdev: update rx timestamp in mbuf using mbuf dynamic field

["Kundapura, Ganapati" <ganapati.kundapura@intel.com>]

Hi Jerin,

> -----Original Message-----
> From: Jerin Jacob <jerinjacobk@gmail.com>
> Sent: 16 September 2021 14:08
> To: Kundapura, Ganapati <ganapati.kundapura@intel.com>
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Jayatheerthan, Jay
> <jay.jayatheerthan@intel.com>; dpdk-dev <dev@dpdk.org>
> Subject: Re: [PATCH v1] eventdev: update rx timestamp in mbuf using mbuf
> dynamic field
> 
> On Thu, Sep 16, 2021 at 2:03 PM Kundapura, Ganapati
> <ganapati.kundapura@intel.com> wrote:
> >
> > Hi Jerrin,
> >
> > > -----Original Message-----
> > > From: Jerin Jacob <jerinjacobk@gmail.com>
> > > Sent: 16 September 2021 10:20
> > > To: Kundapura, Ganapati <ganapati.kundapura@intel.com>; Yigit,
> > > Ferruh <ferruh.yigit@intel.com>
> > > Cc: Jayatheerthan, Jay <jay.jayatheerthan@intel.com>; dpdk-dev
> > > <dev@dpdk.org>
> > > Subject: Re: [PATCH v1] eventdev: update rx timestamp in mbuf using
> > > mbuf dynamic field
> > >
> > > On Tue, Sep 14, 2021 at 12:44 PM Ganapati Kundapura
> > > <ganapati.kundapura@intel.com> wrote:
> > > >
> > > > Add support to register timestamp dynamic field in mbuf.
> > > >
> > > > Update the timestamp in mbuf for each packet before enqueuing to
> > > > event device if the timestamp is not already set.
> > > >
> > > > Adding the timestamp in Rx adapter avoids additional latency due
> > > > to the event device.
> > > >
> > > > Signed-off-by: Ganapati Kundapura <ganapati.kundapura@intel.com>
> > > > ---
> > > >  lib/eventdev/rte_event_eth_rx_adapter.c | 35
> > > > +++++++++++++++++++++++++++++++++
> > > >  1 file changed, 35 insertions(+)
> > > >
> > > > diff --git a/lib/eventdev/rte_event_eth_rx_adapter.c
> > > > b/lib/eventdev/rte_event_eth_rx_adapter.c
> > > > index de8ab05..9cb2550 100644
> > > > --- a/lib/eventdev/rte_event_eth_rx_adapter.c
> > > > +++ b/lib/eventdev/rte_event_eth_rx_adapter.c
> > > > @@ -17,6 +17,7 @@
> > > >  #include <rte_service_component.h>  #include <rte_thash.h>
> > > > #include <rte_interrupts.h>
> > > > +#include <rte_mbuf_dyn.h>
> > > >
> > > >  #include "rte_eventdev.h"
> > > >  #include "eventdev_pmd.h"
> > > > @@ -240,6 +241,17 @@ struct eth_rx_queue_info {
> > > >
> > > >  static struct rte_event_eth_rx_adapter **event_eth_rx_adapter;
> > > >
> > > > +/* Enable dynamic timestamp field in mbuf */ uint64_t
> > > > +event_eth_rx_timestamp_dynflag; int
> > > > +event_eth_rx_timestamp_dynfield_offset = -1;
> > > > +
> > > > +static inline rte_mbuf_timestamp_t *
> > > > +rte_event_eth_rx_timestamp_dynfield(struct rte_mbuf *mbuf)
> > >
> > > Internal functions, please avoid using rte_
> > >
> > > Rest looks good to me. Please send v2 as there are some patchwork
> > > failures too.
> > > I have rebased the next-eventdev tree. So v2 should be pass and we
> > > can merge it.
> > >
> > > Cc: @Ferruh Yigit
> > Looks like rebased next-eventdev tree is not having the latest commits in
> the tree.
> > Patch V2 also failed to apply cleanly. V2 changes are after circular
> > buffer changes but in rebased next-eventdev tree is having commit
> > before circular buffer patch
> 
> Could you share the circular buffer patch? Also, delegate to me the eventdev
> patches.
> Also, Please add dependencies like the following in the patch to track.
> 
> Depends-on: series-18612 ("net/cnxk: support for inline ipsec")
Circular buffer patch: https://patches.dpdk.org/project/dpdk/patch/20210830130625.1892399-1-ganapati.kundapura@intel.com/
Added dependency in the updated patch and delegated to you
> 
> > >
> > >
> > > > +{
> > > > +       return RTE_MBUF_DYNFIELD(mbuf,
> > > > +               event_eth_rx_timestamp_dynfield_offset,
> > > > +rte_mbuf_timestamp_t *); }
> > > > +
> > > >  static inline int
> > > >  rxa_validate_id(uint8_t id)
> > > >  {
> > > > @@ -890,8 +902,18 @@ rxa_buffer_mbufs(struct
> > > rte_event_eth_rx_adapter *rx_adapter,
> > > >         int do_rss;
> > > >         uint16_t nb_cb;
> > > >         uint16_t dropped;
> > > > +       uint64_t ts, ts_mask;
> > > >
> > > >         if (!eth_rx_queue_info->ena_vector) {
> > > > +               ts = m->ol_flags & event_eth_rx_timestamp_dynflag ?
> > > > +                                               0 :
> > > > + rte_get_tsc_cycles();
> > > > +
> > > > +               /* 0xffff ffff ffff ffff if PKT_RX_TIMESTAMP is set,
> > > > +                * otherwise 0
> > > > +                */
> > > > +               ts_mask = (uint64_t)(!(m->ol_flags &
> > > > +
> > > > + event_eth_rx_timestamp_dynflag)) - 1ULL;
> > > > +
> > > >                 /* 0xffff ffff if PKT_RX_RSS_HASH is set, otherwise 0 */
> > > >                 rss_mask = ~(((m->ol_flags & PKT_RX_RSS_HASH) != 0) - 1);
> > > >                 do_rss = !rss_mask &&
> > > > !eth_rx_queue_info->flow_id_mask; @@ -899,6 +921,11 @@
> > > rxa_buffer_mbufs(struct rte_event_eth_rx_adapter *rx_adapter,
> > > >                         struct rte_event *ev;
> > > >
> > > >                         m = mbufs[i];
> > > > +                       *rte_event_eth_rx_timestamp_dynfield(m) =
> > > > +                               ts |
> > > > +                               (*rte_event_eth_rx_timestamp_dynfield(m) &
> > > > +                               ts_mask);
> > > > +
> > > >                         ev = &buf->events[new_tail];
> > > >
> > > >                         rss = do_rss ? rxa_do_softrss(m,
> > > > rx_adapter->rss_key_be) @@ -2256,6 +2283,14 @@
> > > rte_event_eth_rx_adapter_create_ext(uint8_t id, uint8_t dev_id,
> > > >         event_eth_rx_adapter[id] = rx_adapter;
> > > >         if (conf_cb == rxa_default_conf_cb)
> > > >                 rx_adapter->default_cb_arg = 1;
> > > > +
> > > > +       if (rte_mbuf_dyn_rx_timestamp_register(
> > > > +                       &event_eth_rx_timestamp_dynfield_offset,
> > > > +                       &event_eth_rx_timestamp_dynflag) != 0) {
> > > > +               RTE_EDEV_LOG_ERR("Error registering timestamp
> > > > + field in
> > > mbuf\n");
> > > > +               return -rte_errno;
> > > > +       }
> > > > +
> > > >         rte_eventdev_trace_eth_rx_adapter_create(id, dev_id, conf_cb,
> > > >                 conf_arg);
> > > >         return 0;
> > > > --
> > > > 2.6.4
> > > >