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Fixed up and made work a PBUF_REF type. Most of the code uses this now

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instead of PBUF_ROM. This addition allows support of copy-on-demand where the
lower layers can call pbuf_unref() which tests for any PBUF_REF buffers and
replaces them with PBUF_POOL buffers. This is now used
everywhere. pbuf_unref() is called in ARP queueing and in the coldfire
driver, which puts frames on a DMA queue and frees them later.

Along with this change pbuf_free() now goes through the entire chain of
buffers and tests all the ref counters, not just the first one. Generally now
pbuf_ref_chain() should be called and not pbuf_ref(). This change was made
because it is possible for the head of the pbuf chain to have a different
count than the payload pbuf which might have been passed by the application.
This commit is contained in:
davidhaas
2003-03-19 22:14:49 +00:00
parent 2f7e4bd587
commit 32d9f25a6f
7 changed files with 103 additions and 66 deletions
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3
src/core/ipv4/ip_frag.c
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@@ -299,7 +299,7 @@ ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest)
u16_t tmp;
/* Get a RAM based MTU sized pbuf */
rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_ROM);
rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_REF);
rambuf->tot_len = rambuf->len = mtu;
rambuf->payload = buf;
@@ -349,7 +349,6 @@ ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest)
#ifdef IP_STATS
++lwip_stats.ip_frag.xmit;
#endif /* IP_STATS */
pbuf_dechain(header);
pbuf_free(header);
left -= cop;