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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Cc: dev@dpdk.org, Pallavi Kadam <pallavi.kadam@intel.com>,
	Dmitry Malloy <dmitrym@microsoft.com>,
	Narcisa Ana Maria Vasile <navasile@linux.microsoft.com>,
	Ray Kinsella <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>
Subject: Re: [dpdk-dev] [PATCH] doc: announce renaming of rte_ether_hdr fields
Date: Thu, 20 May 2021 16:27:23 +0100	[thread overview]
Message-ID: <038d838f-d973-1fc9-fb8c-706ec39b7704@intel.com> (raw)
In-Reply-To: <20210520180607.7bd3dd64@sovereign>

On 5/20/2021 4:06 PM, Dmitry Kozlyuk wrote:
> 2021-05-20 15:24 (UTC+0100), Ferruh Yigit:
>> On 3/3/2021 10:51 PM, Dmitry Kozlyuk wrote:
> [...]
>>>
>>> It is not mandatory to rename `d_addr`, this is for consistency only.
>>> Naming in `rte_ether_hdr` will also resemble `rte_ipv4/6_hdr`.
>>>
>>> Workaround is to define `struct rte_ether_hdr` in such a away that
>>> it can be used with or without `s_addr` macro (as defined on Windows)
>>> This can be done for Windows only or for all platforms to save space.
>>>
>>>     #pragma push_macro("s_addr")
>>>     #ifdef s_addr
>>>     #undef s_addr
>>>     #endif
>>>
>>>     struct rte_ether_hdr {
>>>         struct rte_ether_addr d_addr; /**< Destination address. */
>>>         RTE_STD_C11
>>>         union {
>>>             struct rte_ether_addr s_addr; /**< Source address. */
>>>             struct {
>>>                 struct rte_ether_addr S_un;
>>>                 /**< MUST NOT be used directly, only via s_addr */
>>>             } S_addr;
>>>             /*< MUST NOT be used directly, only via s_addr */
>>>         };
>>>         uint16_t ether_type; /**< Frame type. */
>>>     } __rte_aligned(2);
>>>
>>>     #pragma pop_macro("s_addr")
>>>   
>>
>> What is the problem with the workaround, why we can't live with it?
>>
>> It requires an order in include files, right?
> 
> There's no problem except a tricky structure definition with fields that
> violate DPDK coding rules. It works with any include order.
> 
> Will fix typos in v3, thanks.
> 

For following case, won't compiler take 's_addr' as macro?

    #include <rte_ether.h>
    #include <winsock2.h>
    struct rte_ether_hdr eh;
    /* eh.s_addr.addr_bytes[0] = 0;


  reply	other threads:[~2021-05-20 15:27 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-03 22:51 Dmitry Kozlyuk
2021-03-03 23:54 ` Stephen Hemminger
2021-03-04  7:09   ` Dmitry Kozlyuk
2021-05-20 14:28     ` Ferruh Yigit
2021-03-10 23:54 ` [dpdk-dev] [PATCH v2] doc: announce API changes for Windows compatibility Dmitry Kozlyuk
2021-03-11 16:19   ` John Alexander
2021-03-11 17:01     ` Dmitry Kozlyuk
2021-03-11 17:08       ` Tyler Retzlaff
2021-03-16 10:37   ` Thomas Monjalon
2021-05-20 18:42   ` [dpdk-dev] [PATCH v3] " Dmitry Kozlyuk
2021-05-20 18:59     ` [dpdk-dev] [EXT] " Akhil Goyal
2021-05-20 19:31       ` Dmitry Kozlyuk
2021-05-20 20:17         ` Akhil Goyal
2021-06-09 15:52           ` Dmitry Kozlyuk
2021-06-23 15:14             ` Dmitry Kozlyuk
2021-06-17 14:27           ` Tyler Retzlaff
2021-07-21 19:55     ` [dpdk-dev] " Dmitry Kozlyuk
2021-07-21 19:55       ` [dpdk-dev] [PATCH v4] " Dmitry Kozlyuk
2021-08-02 12:13         ` Thomas Monjalon
2021-08-02 12:45           ` [dpdk-dev] [EXT] " Akhil Goyal
2021-08-02 13:00             ` Dmitry Kozlyuk
2021-08-02 13:48               ` Akhil Goyal
2021-08-02 14:57                 ` Tal Shnaiderman
2021-08-02 17:46                 ` Thomas Monjalon
2021-05-20 14:24 ` [dpdk-dev] [PATCH] doc: announce renaming of rte_ether_hdr fields Ferruh Yigit
2021-05-20 15:06   ` Dmitry Kozlyuk
2021-05-20 15:27     ` Ferruh Yigit [this message]
2021-05-20 15:50       ` Dmitry Kozlyuk
2021-05-20 16:04         ` Ferruh Yigit
2021-05-20 16:16           ` Dmitry Kozlyuk
2021-05-20 16:25             ` Ferruh Yigit

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