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From: Vladimir Medvedkin <medvedkinv@gmail.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v5] Add toeplitz hash algorithm used by RSS
Date: Tue, 30 Jun 2015 15:14:55 +0300	[thread overview]
Message-ID: <CANDrEHnJGWzXE6-U+wyd8kEWi2_ZCXBsnZEWUS3hLsPdZ=uwwQ@mail.gmail.com> (raw)
In-Reply-To: <20150629124014.GD10380@bricha3-MOBL3>

Hi Bruce,

2015-06-29 15:40 GMT+03:00 Bruce Richardson <bruce.richardson@intel.com>:

> On Fri, Jun 19, 2015 at 01:31:13PM -0400, Vladimir Medvedkin wrote:
> > Software implementation of the Toeplitz hash function used by RSS.
> > Can be used either for packet distribution on single queue NIC
> > or for simulating of RSS computation on specific NIC (for example
> > after GRE header decapsulating).
> >
> > v5 changes
> > - Fix errors reported by checkpatch.pl
> >
> > v4 changes
> > - Fix copyright
> > - rename bswap_mask constant, add rte_ prefix
> > - change rte_ipv[46]_tuple struct
> > - change rte_thash_load_v6_addr prototype
> >
> > v3 changes
> > - Rework API to be more generic
> > - Add sctp_tag into tuple
> >
> > v2 changes
> > - Add ipv6 support
> > - Various style fixes
> >
> > Signed-off-by: Vladimir Medvedkin <medvedkinv@gmail.com>
> > ---
> >  lib/librte_hash/Makefile    |   1 +
> >  lib/librte_hash/rte_thash.h | 207
> ++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 208 insertions(+)
> >  create mode 100644 lib/librte_hash/rte_thash.h
> >
> <snip>
> > +static const __m128i rte_thash_ipv6_bswap_mask = {
> > +             0x0405060700010203, 0x0C0D0E0F08090A0B};
> > +
> > +#define RTE_THASH_V4_L3       2      /*calculate hash of ipv4 header
> only*/
> > +#define RTE_THASH_V4_L4       3      /*calculate hash of ipv4 +
> transport headers*/
> > +#define RTE_THASH_V6_L3       8      /*calculate hash of ipv6 header
> only */
> > +#define RTE_THASH_V6_L4       9      /*calculate hash of ipv6 +
> transport headers */
> > +
>
> Comment as on V4 patch - add LEN to name to make it clear they are lengths
> in quadwords.
>
Agree, but length dwords

>
> > +/**
> > + * IPv4 tuple
> > + * addreses and ports/sctp_tag have to be CPU byte order
> > + */
> > +struct rte_ipv4_tuple {
> > +     uint32_t        src_addr;
> > +     uint32_t        dst_addr;
> > +     union {
> > +             struct {
> > +                     uint16_t dport;
> > +                     uint16_t sport;
> > +             };
> > +             uint32_t        sctp_tag;
> > +     };
> > +};
> > +
> > +/**
> > + * IPv6 tuple
> > + * Addresses have to be filled by rte_thash_load_v6_addr()
> > + * ports/sctp_tag have to be CPU byte order
> > + */
> > +struct rte_ipv6_tuple {
> > +     uint8_t         src_addr[16];
> > +     uint8_t         dst_addr[16];
> > +     union {
> > +             struct {
> > +                     uint16_t dport;
> > +                     uint16_t sport;
> > +             };
> > +             uint32_t        sctp_tag;
> > +     };
> > +};
> > +
> > +union rte_thash_tuple {
> > +     struct rte_ipv4_tuple   v4;
> > +     struct rte_ipv6_tuple   v6;
> > +} __aligned(size);
> > +
> This throws an error on compilation [with unit test patch also applied].
>
I will never copy paste
I will never copy paste
I will never... =)

>
> In file included from /home/bruce/dpdk.org/app/test/test_thash.c:40:0:
> /home/bruce/dpdk.org/x86_64-native-linuxapp-gcc/include/rte_thash.h:106:1:
> error: parameter names (without types) in function declaration [-Werror]
>  } __aligned(size);
>   ^
>
> +/**
> > + * Prepare special converted key to use with rte_softrss_be()
> > + * @param orig
> > + *   pointer to original RSS key
> > + * @param targ
> > + *   pointer to target RSS key
> > + * @param len
> > + *   RSS key length
> > + */
> > +static inline void
> > +rte_convert_rss_key(const uint32_t *orig, uint32_t *targ, int len)
> > +{
> > +     int i;
> > +
> > +     for (i = 0; i < (len >> 2); i++)
> > +             targ[i] = rte_be_to_cpu_32(orig[i]);
> > +}
> > +
> > +/**
> > + * Prepare and load IPv6 address
> > + * @param orig
> > + *   Pointer to ipv6 header of the original packet
> > + * @param targ
> > + *   Pointer to rte_ipv6_tuple structure
> > + */
> > +static inline void
> > +rte_thash_load_v6_addr(const struct ipv6_hdr *orig, union
> rte_thash_tuple *targ)
> > +{
> > +     __m128i ipv6 = _mm_loadu_si128((const __m128i *)orig->src_addr);
> > +     *(__m128i *)targ->v6.src_addr =
> > +                     _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
> > +     ipv6 = _mm_loadu_si128((const __m128i *)orig->dst_addr);
> > +     *(__m128i *)targ->v6.dst_addr =
> > +                     _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
> > +}
>
> I think the function name needs to be pluralized, and the comment updated
> to make
> it clear that it is not just one IPv6 address that is loaded, but rather
> both
> source and destination.
>
I think no need to make too long function name like
rte_thash_load_v6_addresses(), instead I'll make comment more clear.
Is it enough?

>
> Regards,
> /Bruce
>

  reply	other threads:[~2015-06-30 12:14 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-08 19:06 [dpdk-dev] [PATCH] Add toeplitz hash algorithm Vladimir Medvedkin
2015-04-08 22:24 ` Stephen Hemminger
2015-04-09 12:50   ` Vladimir Medvedkin
2015-04-09  6:37 ` Gleb Natapov
2015-04-09 12:57   ` Vladimir Medvedkin
2015-05-05 13:20 ` [dpdk-dev] [PATCH v2] Add toeplitz hash algorithm used by RSS Vladimir Medvedkin
2015-05-05 16:03   ` Chilikin, Andrey
2015-05-07 10:28     ` Vladimir Medvedkin
2015-05-07 11:38       ` Chilikin, Andrey
2015-05-08 14:58         ` Vladimir Medvedkin
2015-05-08 14:58   ` Vladimir Medvedkin
2015-06-03 14:07     ` Thomas Monjalon
2015-06-16  9:07       ` Thomas Monjalon
2015-06-16 10:36         ` Bruce Richardson
2015-06-16 12:29     ` Bruce Richardson
2015-06-16 19:26       ` Vladimir Medvedkin
2015-06-19 14:55     ` [dpdk-dev] [PATCH v4] " Vladimir Medvedkin
2015-06-19 15:59       ` Richardson, Bruce
2015-06-19 16:14         ` Vladimir Medvedkin
2015-06-29 12:18           ` Bruce Richardson
2015-06-19 16:33         ` Mcnamara, John
2015-06-19 17:31       ` [dpdk-dev] [PATCH v5] " Vladimir Medvedkin
2015-06-29 12:40         ` Bruce Richardson
2015-06-30 12:14           ` Vladimir Medvedkin [this message]
2015-06-30 12:48             ` Bruce Richardson
2015-06-30 23:40         ` [dpdk-dev] [PATCH v6] " Vladimir Medvedkin
2015-07-01 15:29           ` Bruce Richardson
2015-07-01 21:23             ` Thomas Monjalon
2015-07-22  7:55           ` Tony Lu
2015-07-27 11:57             ` Vladimir Medvedkin
2015-07-29  5:01               ` Qiu, Michael
2015-07-29 14:00                 ` Vladimir Medvedkin
2015-06-19 17:32       ` [dpdk-dev] [PATCH v3] Add unit test for thash library Vladimir Medvedkin
2015-06-29 12:42         ` Bruce Richardson
2015-06-30 23:41         ` [dpdk-dev] [PATCH v4] " Vladimir Medvedkin
2015-07-01 15:30           ` Bruce Richardson
2015-07-01 21:28             ` Thomas Monjalon

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