DPDK patches and discussions
 help / color / mirror / Atom feed
From: Olivier Matz <olivier.matz@6wind.com>
To: Raslan Darawsheh <rasland@nvidia.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"ferruh.yigit@intel.com" <ferruh.yigit@intel.com>,
	Ori Kam <orika@nvidia.com>,
	"andrew.rybchenko@oktetlabs.ru" <andrew.rybchenko@oktetlabs.ru>,
	"ivan.malov@oktetlabs.ru" <ivan.malov@oktetlabs.ru>,
	"ying.a.wang@intel.com" <ying.a.wang@intel.com>,
	Slava Ovsiienko <viacheslavo@nvidia.com>,
	Shiri Kuzin <shirik@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH v4 1/2] ethdev: add new ext hdr for gtp psc
Date: Thu, 8 Apr 2021 16:10:36 +0200	[thread overview]
Message-ID: <20210408141036.GY1650@platinum> (raw)
In-Reply-To: <DM6PR12MB2748875A91FFD2F5CE464ECCCF749@DM6PR12MB2748.namprd12.prod.outlook.com>

On Thu, Apr 08, 2021 at 12:37:27PM +0000, Raslan Darawsheh wrote:
> Hi Olivier,
> 
> > -----Original Message-----
> > From: Olivier Matz <olivier.matz@6wind.com>
> > Sent: Thursday, April 8, 2021 3:30 PM
> > To: Raslan Darawsheh <rasland@nvidia.com>
> > Cc: dev@dpdk.org; ferruh.yigit@intel.com; Ori Kam <orika@nvidia.com>;
> > andrew.rybchenko@oktetlabs.ru; ivan.malov@oktetlabs.ru;
> > ying.a.wang@intel.com; Slava Ovsiienko <viacheslavo@nvidia.com>; Shiri
> > Kuzin <shirik@nvidia.com>
> > Subject: Re: [PATCH v4 1/2] ethdev: add new ext hdr for gtp psc
> > 
> > Hi Raslan,
> > 
> > On Sun, Apr 04, 2021 at 10:45:51AM +0300, Raslan Darawsheh wrote:
> > > Define new rte header for gtp PDU session container
> > > based on RFC 38415-g30
> > 
> > Do you have a link to this RFC?
> Yes sure,
> https://www.3gpp.org/ftp/Specs/archive/38_series/38.415/38415-g30.zip
> 
> > 
> > > Signed-off-by: Raslan Darawsheh <rasland@nvidia.com>
> > > ---
> > >  lib/librte_net/rte_gtp.h | 34 ++++++++++++++++++++++++++++++++++
> > >  1 file changed, 34 insertions(+)
> > >
> > > diff --git a/lib/librte_net/rte_gtp.h b/lib/librte_net/rte_gtp.h
> > > index 6a6f9b238d..088b0b5a53 100644
> > > --- a/lib/librte_net/rte_gtp.h
> > > +++ b/lib/librte_net/rte_gtp.h
> > > @@ -61,6 +61,40 @@ struct rte_gtp_hdr_ext_word {
> > >  	uint8_t next_ext;     /**< Next Extension Header Type. */
> > >  }  __rte_packed;
> > >
> > > +/**
> > > + * Optional extension for GTP with next_ext set to 0x85
> > > + * defined based on RFC 38415-g30.
> > > + */
> > > +__extension__
> > > +struct rte_gtp_psc_hdr {
> > > +	uint8_t ext_hdr_len; /**< PDU ext hdr len in multiples of 4 bytes */
> > > +	uint8_t type:4; /**< PDU type */
> > > +	uint8_t qmp:1; /**< Qos Monitoring Packet */
> > > +	union {
> > > +		struct {
> > > +			uint8_t snp:1; /**< Sequence number presence */
> > > +			uint8_t spare_dl1:2; /**< spare down link bits */
> > > +		};
> > > +		struct {
> > > +			uint8_t dl_delay_ind:1; /**< dl delay result presence
> > */
> > > +			uint8_t ul_delay_ind:1; /**< ul delay result presence
> > */
> > > +			uint8_t snp_ul1:1; /**< Sequence number presence
> > ul */
> > > +		};
> > > +	};
> > > +	union {
> > > +		struct {
> > > +			uint8_t ppp:1; /**< Paging policy presence */
> > > +			uint8_t rqi:1; /**< Reflective Qos Indicator */
> > > +		};
> > > +		struct {
> > > +			uint8_t n_delay_ind:1; /**< N3/N9 delay result
> > presence */
> > > +			uint8_t spare_ul2:1; /**< spare up link bits */
> > > +		};
> > > +	};
> > > +	uint8_t qfi:6; /**< Qos Flow Identifier */
> > > +	uint8_t data[0]; /**< data feilds */
> > > +} __rte_packed;
> > 
> > With this header, sizeof(rte_gtp_psc_hdr) = 5, is it really expected?
> The data[0] is variable length data, I guess I should send another version to mention that in the comment maybe.
> The header size according to the spec should be 4 octets aligned in general.

What I wanted to highlight is that using union of structs containing
bitfields does not work as you expect: each union is at least 1 byte.
This results in a structure that does not match the expected header.

> > 
> > It would help to see the specification to have a better idea of how to
> Sure, I've just posted the link above, please let me know of any suggestion that you have, and I'll be glad to do accordingly.
> 
> > split, but a possible solution is to do something like this:
> > 
> > struct rte_gtp_psc_generic_hdr {
> > 	uint8_t ext_hdr_len;
> > 	uint8_t type:4
> > 	uint8_t qmp:1;
> > 	uint8_t pad:3;
> > };
> > 
> > struct rte_gtp_psc_<name1>_hdr {
> > 	uint8_t ext_hdr_len;
> > 	uint8_t type:4
> > 	uint8_t qmp:1;
> > 	uint8_t uint8_t snp:1;
> > 	uint8_t spare_dl1:2;
> > 	...
> > };
> > 
> > ...
> > 
> > struct rte_gtp_psc_hdr {
> > 	union {
> > 		struct rte_gtp_psc_generic_hdr generic;
> > 		struct rte_gtp_psc_<name1>_hdr <name1>;
> > 		struct rte_gtp_psc_<name2>_hdr <name2>;
> > 	};
> > };

From what I see in the documation, I think this approach should
work. From afar, I suggest:

struct rte_gtp_psc_generic_hdr {
#if big endian
	uint8_t type:4
	uint8_t qmp:1;
	uint8_t pad:3;
#else
	uint8_t pad:3;
	uint8_t qmp:1;
	uint8_t type:4
#endif
};

struct rte_gtp_psc_type0_hdr {
#if big endian
	uint8_t type:4
	uint8_t qmp:1;
	uint8_t snp:1;
	uint8_t spare:2;

	uint8_t ppp:1;
	...
#else
	uint8_t pad:3;
	uint8_t qmp:1;
	uint8_t type:4
	uint8_t spare:2;
	uint8_t snp:1;

	...
#endif
	uint8_t data[0]; /* for variable fields */
};

struct rte_gtp_psc_type1_hdr {
	... same for fixed fields of type1


	uint8_t data[0]; /* for variable fields */
};

I don't see in the spec where is the reference to ext_hdr_len.

Regards,
Olivier

  parent reply	other threads:[~2021-04-08 14:10 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 12:11 [dpdk-dev] [PATCH] ethdev: update qfi definition Raslan Darawsheh
2021-03-26 13:12 ` Ferruh Yigit
2021-03-29  8:53   ` Ori Kam
2021-03-29  9:06     ` Raslan Darawsheh
2021-03-29 11:14       ` Ferruh Yigit
2021-03-30  7:50 ` [dpdk-dev] [PATCH v2 0/2] fix gtp psc qfi support Raslan Darawsheh
2021-03-30  7:50   ` [dpdk-dev] [PATCH v2 1/2] ethdev: add new ext hdr for gtp psc Raslan Darawsheh
2021-03-30  8:00     ` [dpdk-dev] [PATCH v3 0/2] fix gtp psc qfi support Raslan Darawsheh
2021-03-30  8:00       ` [dpdk-dev] [PATCH v3 1/2] ethdev: add new ext hdr for gtp psc Raslan Darawsheh
2021-04-01 16:51         ` Ferruh Yigit
2021-04-04  7:17           ` Raslan Darawsheh
2021-03-30  8:00       ` [dpdk-dev] [PATCH v3 2/2] ethdev: update qfi definition Raslan Darawsheh
2021-04-01 16:54         ` Ferruh Yigit
2021-04-04  7:18           ` Raslan Darawsheh
2021-04-04  7:45     ` [dpdk-dev] [PATCH v4 0/2] fix gtp psc qfi support Raslan Darawsheh
2021-04-04  7:45       ` [dpdk-dev] [PATCH v4 1/2] ethdev: add new ext hdr for gtp psc Raslan Darawsheh
2021-04-08 12:29         ` Olivier Matz
2021-04-08 12:37           ` Raslan Darawsheh
2021-04-08 14:10             ` Ferruh Yigit
2021-04-08 14:10             ` Olivier Matz [this message]
2021-04-13  7:45               ` Raslan Darawsheh
2021-04-29 16:29           ` Tyler Retzlaff
2021-06-08 12:13             ` Andrew Rybchenko
2021-04-04  7:45       ` [dpdk-dev] [PATCH v4 2/2] ethdev: update qfi definition Raslan Darawsheh
2021-04-06 16:09         ` Ferruh Yigit
2021-04-13  8:14           ` Raslan Darawsheh
2021-04-13  9:24             ` Ori Kam
2021-04-14 12:16               ` Ferruh Yigit
2021-04-15  6:33                 ` Raslan Darawsheh
2021-04-29  8:10       ` [dpdk-dev] [PATCH v5 0/1] add new hdr for gtp qfi Raslan Darawsheh
2021-04-29  8:10         ` [dpdk-dev] [PATCH v5 1/1] ethdev: add new ext hdr for gtp psc Raslan Darawsheh
2021-05-11 11:46           ` Ferruh Yigit
2021-06-08 12:17           ` Andrew Rybchenko
2021-06-08 12:18             ` Andrew Rybchenko
2021-06-08 14:07               ` Raslan Darawsheh
2021-03-30  7:50   ` [dpdk-dev] [PATCH v2 2/2] ethdev: update qfi definition Raslan Darawsheh
2021-04-14 12:40 ` [dpdk-dev] [PATCH] " Ferruh Yigit

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210408141036.GY1650@platinum \
    --to=olivier.matz@6wind.com \
    --cc=andrew.rybchenko@oktetlabs.ru \
    --cc=dev@dpdk.org \
    --cc=ferruh.yigit@intel.com \
    --cc=ivan.malov@oktetlabs.ru \
    --cc=orika@nvidia.com \
    --cc=rasland@nvidia.com \
    --cc=shirik@nvidia.com \
    --cc=viacheslavo@nvidia.com \
    --cc=ying.a.wang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).