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[lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs
From: |
Simon Goldschmidt |
Subject: |
[lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs |
Date: |
Fri, 23 Dec 2016 07:01:11 +0000 (UTC) |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36 |
Follow-up Comment #2, bug #49914 (project lwip):
I can understand your position Joel. And I think we should support zero copy
in this case.
However, the part where "the netif output function is responsible for copying
the pbuf/data" is unclear. Even PBUF_RAM get changed eventually, at least from
TCP.
I guess a clear definition that DMA-enabled drivers must memcpy PBUF_REF pbufs
before sending would be best. However, there are additional problems here as
you have a PBUF_RAM header and PBUF_REF data. Is it allowed for the driver to
change the next pointer of the header pbuf when this pbuf is still referenced
by someone else?
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- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Dirk Ziegelmeier, 2016/12/22
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Dirk Ziegelmeier, 2016/12/22
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Joel Cunningham, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs,
Simon Goldschmidt <=
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Joel Cunningham, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Dirk Ziegelmeier, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, David van Moolenbroek, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Joel Cunningham, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, David van Moolenbroek, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Dirk Ziegelmeier, 2016/12/23
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Joel Cunningham, 2016/12/27
- [lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs, Simon Goldschmidt, 2016/12/27