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| From: | wuxinjia |
| Subject: | [lwip-devel] [bug #34019] Bug when use LWIP_NETIF_TX_SINGLE_PBUF |
| Date: | Tue, 16 Aug 2011 02:55:14 +0000 |
| User-agent: | Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 1.1.4322; InfoPath.2) |
URL:
<http://savannah.nongnu.org/bugs/?34019>
Summary: Bug when use LWIP_NETIF_TX_SINGLE_PBUF
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: phoenix_wu
Submitted on: Tue Aug 16 02:55:13 2011
Category: TCP
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release:
lwIP version: 1.4.0
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Details:
when i use LWIP_NETIF_TX_SINGLE_PBUF, tcp_pbuf_prealloc() will malloc MSS
length pbuf. But in tcp_write,
space = pcb->mss - (last_unsent->len + unsent_optlen).
In most times, pcb->mss == MSS, but pcb->mss may be negotiated and become less
than MSS. So Problem appears. I change tcp_pbuf_prealloc() malloc pcb->mss
length pbuf. It seems much better, but sometimes problem (unsent_oversize
mismatch (pcb vs. last_unsent)) still appears.
_______________________________________________________
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