[PATCH] net/gve: Enable stats reporting for GQ format

[Joshua Washington]

>
>
>> <...>
>>
>> >  gve_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
>> >  {
>> >       uint16_t i;
>> > +     if (gve_is_gqi(dev->data->dev_private))
>> > +             gve_get_imissed_from_nic(dev);
>> >
>>
>> This updates imissed in RxQ struct for all queues for basic stats, but
>> what if user only calls xstats, I guess in that case stat won't be
>> updated.
>>
>
> Yes; that is expected. Since imissed is a member of rte_eth_stats; calling
> gve_dev_stats_get is the right way to get this stat.
>

I actually think that this should be a counter backed by an xstat as well.
As far as I can tell xstats is meant to be a more flexible version of
stats, and ultimately should be able to handle a superset of what basic
stats can handle, for the purposes of querying, etc.

On Mon, Jan 15, 2024 at 10:18 PM Rushil Gupta <rushilg at google.com> wrote:

>
>
> On Fri, Jan 12, 2024 at 8:36 PM Ferruh Yigit <ferruh.yigit at amd.com> wrote:
>
>> On 12/22/2023 3:39 PM, Rushil Gupta wrote:
>> > Read from shared region to retrieve imissed statistics for GQ from
>> device.
>> > Tested using `show port xstats <port-id>` in interactive mode.
>> > This metric can be triggered by using queues > cores.
>> >
>>
>> Looks good but please check following comments:
>>
>> Checkpatch gives warning on the patch title, and this patch adds
>> 'imissed' support so it can be added to the patch title, something like:
>> "net/gve: enable imissed stats for GQ format"
>>
>> <...>
>>
>> > +static int gve_alloc_stats_report(struct gve_priv *priv,
>> > +             uint16_t nb_tx_queues, uint16_t nb_rx_queues)
>> > +{
>> > +     char z_name[RTE_MEMZONE_NAMESIZE];
>> > +     int tx_stats_cnt;
>> > +     int rx_stats_cnt;
>> > +
>> > +     tx_stats_cnt = (GVE_TX_STATS_REPORT_NUM +
>> NIC_TX_STATS_REPORT_NUM) *
>> > +             nb_tx_queues;
>> > +     rx_stats_cnt = (GVE_RX_STATS_REPORT_NUM +
>> NIC_RX_STATS_REPORT_NUM) *
>> > +             nb_rx_queues;
>> > +     priv->stats_report_len = sizeof(struct gve_stats_report) +
>> > +             sizeof(struct stats) * (tx_stats_cnt + rx_stats_cnt);
>> > +
>> > +     snprintf(z_name, sizeof(z_name), "stats_report_%s",
>> priv->pci_dev->device.name);
>> >
>>
>> Can you please add 'gve_' prefix to the memzone name, to prevent any
>> possible collision.
>>
> Done.
>
>>
>> <...>
>>
>> > +static void gve_free_stats_report(struct rte_eth_dev *dev)
>> > +{
>> > +     struct gve_priv *priv = dev->data->dev_private;
>> > +     rte_memzone_free(priv->stats_report_mem);
>> >
>>
>> What will happen if user asks stats/xstats after port stopped?
>>
> Good catch. I have added a null check so that the driver doesn't try to
> read stats from memory region that doesn't exist.
>
>>
>> <...>
>>
>> >  gve_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
>> >  {
>> >       uint16_t i;
>> > +     if (gve_is_gqi(dev->data->dev_private))
>> > +             gve_get_imissed_from_nic(dev);
>> >
>>
>> This updates imissed in RxQ struct for all queues for basic stats, but
>> what if user only calls xstats, I guess in that case stat won't be
>> updated.
>>
>
> Yes; that is expected. Since imissed is a member of rte_eth_stats; calling
> gve_dev_stats_get is the right way to get this stat.
>


-- 

Joshua Washington | Software Engineer | joshwash at google.com | (414) 366-4423
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