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From: Olivier MATZ <olivier.matz@6wind.com>
To: Yerden Zhumabekov <e_zhumabekov@sts.kz>,
	 Bruce Richardson <bruce.richardson@intel.com>,
	dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 03/13] mbuf: add packet_type field
Date: Mon, 08 Sep 2014 13:17:18 +0200
Message-ID: <540D903E.1060206@6wind.com> (raw)
In-Reply-To: <540D85E0.4030203@sts.kz>

Hi Yerden,

On 09/08/2014 12:33 PM, Yerden Zhumabekov wrote:
> 08.09.2014 16:17, Olivier MATZ пишет:
>>> --- a/lib/librte_mbuf/rte_mbuf.h
>>> +++ b/lib/librte_mbuf/rte_mbuf.h
>>> @@ -146,7 +146,7 @@ struct rte_mbuf {
>>>  	uint32_t reserved1;     /**< Unused field. Required for padding */
>>>  
>>>  	/* remaining bytes are set on RX when pulling packet from descriptor */
>>> -	uint16_t reserved2;     /**< Unused field. Required for padding */
>>> +	uint16_t packet_type;   /**< Type of packet, e.g. protocols used */
>>>  	uint16_t data_len;      /**< Amount of data in segment buffer. */
>>>  	uint32_t pkt_len;       /**< Total pkt len: sum of all segments. */
>>>  	uint16_t l3_len:9;      /**< L3 (IP) Header Length. */
>>>
>> This patch adds a new fields that nobody uses. So why should we add it ?
> 
> I would use it :)
> It's useful to store the IP protocol number (UDP, TCP etc) and version
> of IP (4, 6) and then relay packet to specific handler.

I'm not saying this field is useless. But even if it's useful
for some applications like yours, it does not mean that it should go in
the generic mbuf structure.

Also, for a new field, we should define who is in charge of filling it.
Is is the driver? Does it mean that all drivers have to be modified to
fill it? Or is it just a placeholder for applications? In this case,
shouldn't we use application-specific metadata? In the other direction
(TX), we would also need to define if this field must be filled by the
application before transmitting a mbuf to a driver.

Regards,
Olivier

  reply	other threads:[~2014-09-08 11:12 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-03 15:49 [dpdk-dev] [PATCH 00/13] Mbuf Structure Rework, part 2 Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 01/13] mbuf: replace data pointer by an offset Bruce Richardson
2014-09-08  9:52   ` Olivier MATZ
2014-09-08  9:55     ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 02/13] mbuf: reorder fields by time of use Bruce Richardson
2014-09-08 10:17   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 03/13] mbuf: add packet_type field Bruce Richardson
2014-09-08 10:17   ` Olivier MATZ
2014-09-08 10:33     ` Yerden Zhumabekov
2014-09-08 11:17       ` Olivier MATZ [this message]
2014-09-09  3:59         ` Zhang, Helin
     [not found]           ` <540EB428.9060706@6wind.com>
2014-09-09  8:45             ` Zhang, Helin
2014-09-09  9:47             ` Richardson, Bruce
2014-09-09 15:05         ` Jim Thompson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 04/13] mbuf: expand ol_flags field to 64-bits Bruce Richardson
2014-09-08 10:25   ` Olivier MATZ
2014-09-09  9:00     ` Richardson, Bruce
2014-09-03 15:49 ` [dpdk-dev] [PATCH 05/13] mbuf: introduce a flag to indicate a control mbuf Bruce Richardson
2014-09-08 11:53   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 06/13] mbuf: minor changes for readability Bruce Richardson
2014-09-08 12:03   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 07/13] mbuf: use macros only to access the mbuf metadata Bruce Richardson
2014-09-08 12:05   ` Olivier MATZ
2014-09-09  9:01     ` Richardson, Bruce
2014-09-12 16:56       ` Dumitrescu, Cristian
2014-09-12 21:02         ` Olivier MATZ
2014-09-16 20:07           ` Dumitrescu, Cristian
2014-09-16 22:06             ` Ramia, Kannan Babu
2014-09-17 10:31               ` Richardson, Bruce
2014-09-17 14:01                 ` Thomas Monjalon
2014-09-10 15:09     ` Bruce Richardson
2014-09-10 15:31       ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 08/13] mbuf: add named points inside the mbuf structure Bruce Richardson
2014-09-08 12:08   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 09/13] ixgbe: rework vector pmd following mbuf changes Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 10/13] mbuf: split mbuf across two cache lines Bruce Richardson
2014-09-08 12:10   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 11/13] mbuf: move l2_len and l3_len to second cache line Bruce Richardson
2014-09-04  5:08   ` Yerden Zhumabekov
2014-09-04 10:27     ` Bruce Richardson
2014-09-04 11:00       ` Yerden Zhumabekov
2014-09-04 11:55         ` Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 12/13] ixgbe: Fix perf regression due to moved pool ptr Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 13/13] ixgbe: Improve slow-path perf: vector scattered RX Bruce Richardson
2014-09-11 13:15 ` [dpdk-dev] [PATCH v2 00/13] Mbuf Structure Rework, part 2 Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 01/13] mbuf: replace data pointer by an offset Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 02/13] mbuf: reorder fields by time of use Bruce Richardson
2014-09-15  7:11     ` Liu, Jijiang
2014-09-15  8:19       ` Richardson, Bruce
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 03/13] mbuf: expand ol_flags field to 64-bits Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 04/13] mbuf: introduce a flag to indicate a control mbuf Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 05/13] mbuf: minor changes for readability Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 06/13] mbuf: use macros only to access the mbuf metadata Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 07/13] mbuf: move metadata macros to rte_port library Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 08/13] mbuf: add named points inside the mbuf structure Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 09/13] ixgbe: rework vector pmd following mbuf changes Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 10/13] mbuf: split mbuf across two cache lines Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 11/13] mbuf: move l2_len and l3_len to second cache line Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 12/13] ixgbe: Fix perf regression due to moved pool ptr Bruce Richardson
2014-09-15 16:20     ` [dpdk-dev] [PATCH v3 " Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 13/13] ixgbe: Improve slow-path perf: vector scattered RX Bruce Richardson
2014-09-17 22:35   ` [dpdk-dev] [PATCH v2 00/13] Mbuf Structure Rework, part 2 Thomas Monjalon

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