lwIP - A Lightweight TCP/IP stack - Bugs: bug #29361, ip_frag has problems with...
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bug #29361: ip_frag has problems with zero-copy DMA MACs
Submitter: | Simon Goldschmidt <goldsimon> | ||
Submitted: | Sat 27 Mar 2010 05:54:02 PM UTC | ||
Category: | IPv4 | Severity: | 3 - Normal |
Item Group: | Crash Error | Status: | Fixed |
Privacy: | Public | Assigned to: | goldsimon |
Open/Closed: | Closed | Planned Release: | None |
lwIP version: | CVS Head |
Mon 21 Jun 2010 06:51:18 PM UTC, comment #4: |
Simon Goldschmidt <goldsimon> |
Mon 14 Jun 2010 08:32:03 PM UTC, comment #3: Since noone seems to bother, I'll implement this (and task #7896) by adding a new pbuf type that expects a 'free' function pointer right after the current struct pbuf (I'll add a struct definition for that). This way, bot (zero-copy-)drivers and the IP_FRAG code can allocate their own pbufs as they have to. |
Simon Goldschmidt <goldsimon> |
Fri 30 Apr 2010 07:13:44 PM UTC, comment #2: I think this has to be solved for 1.4.0 since it might involve API changes.
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Simon Goldschmidt <goldsimon> |
Sun 28 Mar 2010 10:31:58 AM UTC, comment #1: This bug can currently be avoided only by setting IP_FRAG_USES_STATIC_BUF==0 and LWIP_NETIF_TX_SINGLE_PBUF==1, which creates a new PBUF_RAM for each fragment, which comes at the downside of a memcpy. |
Simon Goldschmidt <goldsimon> |
Sat 27 Mar 2010 05:54:02 PM UTC, original submission:
This is kind of a duplicate to bug #29271 (Application can't re-use pbufs), but it's in the stack, not in applications, and we need to remember to fix it.
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Simon Goldschmidt <goldsimon> |
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Follow 7 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2010-06-21 | goldsimon | Category | None | IPv4 | |
Item Group | None | Crash Error | |||
Status | In Progress | Fixed | |||
Open/Closed | Open | Closed | |||
2010-04-30 | goldsimon | Status | None | In Progress | |
Assigned to | None | goldsimon | |||
Planned Release | 1.4.0 |
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Corresponding source code
Finally found the time to implement "custom" pbufs. I also set IP_FRAG_USES_STATIC_BUF=0 as default to be on the safe side (as =1 has problems with DMA-enabled MACs and lwIP should work OK with default settings).