From: "Michał Krawczyk" <mk@semihalf.com>
To: Andrew Rybchenko <arybchenko@solarflare.com>
Cc: dev@dpdk.org, Marcin Wojtas <mw@semihalf.com>,
Maciej Bielski <mba@semihalf.com>,
"Tzalik, Guy" <gtzalik@amazon.com>,
"Schmeilin, Evgeny" <evgenys@amazon.com>,
"Chauskin, Igor" <igorch@amazon.com>
Subject: Re: [dpdk-dev] [PATCH 04/29] net/ena/base: set default hash key
Date: Tue, 31 Mar 2020 11:51:20 +0200 [thread overview]
Message-ID: <CAJMMOfNwx0+urx-z2O+Vkg2AE8XAZaVy8r1SkxFzYGEgRF3ZyQ@mail.gmail.com> (raw)
In-Reply-To: <CAJMMOfN6EABi1wkPMqyTCC9UAwFdAY_yrTG1MtgaDvH2RXscMg@mail.gmail.com>
wt., 31 mar 2020 o 11:40 Michał Krawczyk <mk@semihalf.com> napisał(a):
>
> pt., 27 mar 2020 o 12:12 Andrew Rybchenko <arybchenko@solarflare.com>
> napisał(a):
> >
> > On 3/27/20 1:17 PM, Michal Krawczyk wrote:
> > > The RSS hash key was present in the device, but it wasn't exposed to
> > > the user. The other key still cannot be set, but now it can be accessed
> > > if one needs to do that.
> > >
> > > By default, the random hash key is used and it is generated only once
> > > when requested for the first time.
> > >
> > > Signed-off-by: Michal Krawczyk <mk@semihalf.com>
> > > Reviewed-by: Igor Chauskin <igorch@amazon.com>
> > > Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
> >
> > [snip]
> >
> > > diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
> > > index cab38152a7..4c1e4899d0 100644
> > > --- a/drivers/net/ena/ena_ethdev.c
> > > +++ b/drivers/net/ena/ena_ethdev.c
> > > @@ -256,6 +256,22 @@ static const struct eth_dev_ops ena_dev_ops = {
> > > .reta_query = ena_rss_reta_query,
> > > };
> > >
> > > +void ena_rss_key_fill(void *key, size_t size)
> > > +{
> > > + static bool key_generated;
> > > + static uint8_t default_key[ENA_HASH_KEY_SIZE];
> >
> > You have thread-safety patches in the series before this one.
> > Is it OK to be thread-unsafe here?
> >
I forgot to refer to this comment, sorry. ena_rss_key_fill() is called
only from ena_start() and as far as I know, it can be called only from
single-threaded context (device configuration flow). In that case,
there is no risk and we can be thread-unsafe.
> > > +
> > > + RTE_ASSERT(size <= ENA_HASH_KEY_SIZE);
> > > +
> > > + if (unlikely(!key_generated)) {
> >
> > I believe that unlikely() is not required here. It is not a
> > datapath and there is no point to use likely/unlikely on
> > control path.
> >
>
> I will remove it in v2.
>
> > > + for (size_t i = 0; i < ENA_HASH_KEY_SIZE; ++i)
> >
> > It is C99 feature which breaks DPDK build pretty often, since
> > neither c99 nor higher are requested in default DPDK build.
> >
>
> Ok, will be fixed in v2.
>
> > > + default_key[i] = rte_rand() & 0xff;
> > > + key_generated = true;
> > > + }
> > > +
> > > + rte_memcpy(key, default_key, size);
> > > +}
> > > +
> > > static inline void ena_rx_mbuf_prepare(struct rte_mbuf *mbuf,
> > > struct ena_com_rx_ctx *ena_rx_ctx)
> > > {
> > >
> >
next prev parent reply other threads:[~2020-03-31 9:51 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 10:17 [dpdk-dev] [PATCH 00/29] Update ENA driver to v2.1.0 Michal Krawczyk
2020-03-27 10:17 ` [dpdk-dev] [PATCH 01/29] net/ena: check if size of buffer is at least 1400B Michal Krawczyk
2020-03-27 10:55 ` Andrew Rybchenko
2020-03-31 9:47 ` Michał Krawczyk
2020-03-27 14:51 ` Stephen Hemminger
2020-03-31 9:48 ` Michał Krawczyk
2020-03-27 10:17 ` [dpdk-dev] [PATCH 02/29] net/ena/base: make allocation macros thread-safe Michal Krawczyk
2020-03-27 14:54 ` Stephen Hemminger
2020-03-31 9:47 ` Michał Krawczyk
2020-03-27 10:17 ` [dpdk-dev] [PATCH 03/29] net/ena/base: prevent allocation of 0-sized memory Michal Krawczyk
2020-03-27 10:17 ` [dpdk-dev] [PATCH 04/29] net/ena/base: set default hash key Michal Krawczyk
2020-03-27 11:12 ` Andrew Rybchenko
2020-03-31 9:40 ` Michał Krawczyk
2020-03-31 9:51 ` Michał Krawczyk [this message]
2020-03-27 10:17 ` [dpdk-dev] [PATCH 05/29] net/ena/base: rework interrupt moderation Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 06/29] net/ena/base: remove extra properties strings Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 07/29] net/ena/base: add accelerated LLQ mode Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 08/29] net/ena/base: fix documentation of the functions Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 09/29] net/ena/base: fix indentation in cq polling Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 10/29] net/ena/base: add error logs when preparing Tx Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 11/29] net/ena/base: use 48-bit memory addresses in ena_com Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 12/29] net/ena/base: fix types for printing timestamps Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 13/29] net/ena/base: fix indentation of multiple defines Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 14/29] net/ena/base: update gen date and commit Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 15/29] net/ena: set IO ring size to the valid value Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 16/29] net/ena: refactor getting IO queues capabilities Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 17/29] net/ena: add support for large LLQ headers Michal Krawczyk
2020-03-27 11:20 ` Andrew Rybchenko
2020-03-31 9:42 ` Michał Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 18/29] net/ena: remove memory barriers before doorbells Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 19/29] net/ena: add Tx drops statistic Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 20/29] net/ena: disable meta caching Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 21/29] net/ena: refactor Rx path Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 22/29] net/ena: rework getting number of available descs Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 23/29] net/ena: limit refill threshold by fixed value Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 24/29] net/ena: use macros for ring idx operations Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 25/29] net/ena: refactor Tx path Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 26/29] net/ena: reuse 0 length Rx descriptor Michal Krawczyk
2020-03-27 11:29 ` Andrew Rybchenko
2020-03-31 9:45 ` Michał Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 27/29] doc: add notes on ENA usage on metal instances Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 28/29] net/ena: update copyright date Michal Krawczyk
2020-03-27 10:18 ` [dpdk-dev] [PATCH 29/29] net/ena: update version of the driver to v2.1.0 Michal Krawczyk
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