Hi Amena,
I don't remember the exact details for the copy, but it may have been
related to:
- the input/output pbufs are sometimes allocated from different sources
- it's possible the output pbuf needs to be buffered (e.g. if neighbor
discovery is required before the response)
- I believe there could be different IPv6 option headers in req and resp
and bring alignment issues
I know I tested no-copy at the time it was developed and run into some
problem. Hope this gives you a hint if you're investigating.
Regards,
Ivan
On 2018-08-14 10:00, [email protected] wrote:
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Today's Topics:
1. icmp6 (Amena El Homsi)
2. Re: icmp6 ([email protected])
3. Re: LwIP RAW + Zynq - Unresponsive Tx path when Rx is active
(Nenad Pekez)
4. Re: icmp6 (Amena El Homsi)
----------------------------------------------------------------------
Date: Tue, 14 Aug 2018 15:49:57 +0300
From: Amena El Homsi <[email protected]>
To: Mailing list for lwIP users <[email protected]>
Subject: [lwip-users] icmp6
Message-ID:
<CALEf8F3jNo=bbbd1ivwg6g7abe3bs08075hadf--nr_gcm-...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
When we receive an echo request using IPv6, LwIP copies the request to
new
pbuf to send the reply.
Why LwIP doesn't use the echo request pbuf, instead of allocating a new
one
(as what LwIP does when replying to IPv4 echo requests)?
Thanks in advance.
--
Amena El-Homsi
Computer & Communication Engineer
Dipl. Eng, M.S.
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