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From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: Gregory Etelson <getelson@nvidia.com>
Cc: dev@dpdk.org, matan@nvidia.com, orika@nvidia.com,
	rasland@nvidia.com,
	Bernard Iremonger <bernard.iremonger@intel.com>,
	Olivier Matz <olivier.matz@6wind.com>
Subject: Re: [dpdk-dev] [PATCH] net: introduce IPv4 ihl and version fields
Date: Thu, 17 Jun 2021 08:02:42 -0700	[thread overview]
Message-ID: <20210617150242.GC29777@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> (raw)
In-Reply-To: <20210527152858.13312-1-getelson@nvidia.com>

On Thu, May 27, 2021 at 06:28:58PM +0300, Gregory Etelson wrote:
> diff --git a/lib/net/rte_ip.h b/lib/net/rte_ip.h
> index 4b728969c1..684bb028b2 100644
> --- a/lib/net/rte_ip.h
> +++ b/lib/net/rte_ip.h
> @@ -38,7 +38,21 @@ extern "C" {
>   * IPv4 Header
>   */
>  struct rte_ipv4_hdr {
> -	uint8_t  version_ihl;		/**< version and header length */
> +	__extension__

this patch reduces compiler portability, though not strictly objecting
so long as the community accepts that it may lead to conditional
compilation having to be introduced in a future change.

please also be mindful of the impact of __attribute__ ((__packed__)) in
the presence of bitfields on gcc when evaluating abi compatibility.

> +	union {
> +		uint8_t version_ihl;    /**< version and header length */
> +		struct {
> +#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
> +			uint8_t ihl:4;
> +			uint8_t version:4;
> +#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
> +			uint8_t version:4;
> +			uint8_t ihl:4;
> +#else
> +#error "setup endian definition"
> +#endif
> +		};
> +	};
>  	uint8_t  type_of_service;	/**< type of service */
>  	rte_be16_t total_length;	/**< length of packet */
>  	rte_be16_t packet_id;		/**< packet ID */
> -- 
> 2.31.1

  parent reply	other threads:[~2021-06-17 15:02 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27 15:28 Gregory Etelson
2021-05-27 15:56 ` Morten Brørup
2021-05-28 10:20   ` Ananyev, Konstantin
2021-05-28 10:52     ` Morten Brørup
2021-05-28 14:18       ` Gregory Etelson
2021-05-31  9:58         ` Ananyev, Konstantin
2021-05-31 11:10           ` Gregory Etelson
2021-06-02  9:51             ` Gregory Etelson
2021-06-10  4:10               ` Gregory Etelson
2021-06-10  9:22                 ` Olivier Matz
2021-06-14 16:36                   ` Andrew Rybchenko
2021-06-17 16:29                     ` Ferruh Yigit
2021-06-03  0:58   ` Min Hu (Connor)
2021-06-03  2:03     ` Stephen Hemminger
2021-06-03  4:59       ` Gregory Etelson
2021-06-17 15:02 ` Tyler Retzlaff [this message]
2021-09-03  7:30 ` [dpdk-dev] [PATCH v2] " getelson
2021-10-04  7:49   ` Olivier Matz
2021-10-04  8:59     ` Gregory Etelson
2021-10-04  8:46 ` [dpdk-dev] [PATCH v3] " Gregory Etelson
2021-10-04 12:13 ` [dpdk-dev] [PATCH v4] " Gregory Etelson
2021-10-04 15:59   ` Stephen Hemminger
2021-10-04 16:48     ` Olivier Matz
2021-10-12 12:36       ` Gregory Etelson
2021-10-12 12:29 ` [dpdk-dev] [PATCH v5] " Gregory Etelson
2021-10-13  8:58   ` Kinsella, Ray
2021-10-13 12:14   ` Ferruh Yigit
2021-10-13 17:12     ` Gregory Etelson
2021-10-13 17:13 ` [dpdk-dev] [PATCH v6 0/2] " Gregory Etelson
2021-10-13 17:13   ` [dpdk-dev] [PATCH v6 1/2] net: fix IPv4 change announce Gregory Etelson
2021-10-14  8:37     ` Thomas Monjalon
2021-10-14 11:03       ` Ferruh Yigit
2021-10-14 12:21         ` Gregory Etelson
2021-10-14 12:32           ` Ferruh Yigit
2021-10-14 13:34             ` Ori Kam
2021-10-14 12:53       ` [dpdk-dev] [EXT] " Akhil Goyal
2021-10-13 17:13   ` [dpdk-dev] [PATCH v6 2/2] net: introduce IPv4 ihl and version fields Gregory Etelson
2021-10-14 15:11     ` Ferruh Yigit
2021-10-14 16:04       ` Thomas Monjalon
2021-10-14 17:42         ` Gregory Etelson
2021-10-14  8:21   ` [dpdk-dev] [PATCH v6 0/2] " Ferruh Yigit
2021-10-14  8:30     ` Thomas Monjalon
2021-10-14 11:01       ` Ferruh Yigit
2021-10-14  9:29     ` Gregory Etelson
2021-10-14 11:10       ` Ferruh Yigit
2021-10-14 17:41 ` [dpdk-dev] [PATCH v7 " Gregory Etelson
2021-10-14 17:41   ` [dpdk-dev] [PATCH v7 1/2] net: fix IPv4 change announce Gregory Etelson
2021-10-14 20:00     ` Slava Ovsiienko
2021-10-21 22:00       ` Ajit Khaparde
2021-10-14 17:41   ` [dpdk-dev] [PATCH v7 2/2] net: introduce IPv4 ihl and version fields Gregory Etelson
2021-10-14 18:16     ` Ajit Khaparde
2021-10-14 19:52   ` [dpdk-dev] [PATCH v7 0/2] " Ferruh Yigit

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