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Fixed bug #28064: pbuf_alloc(PBUF_POOL) is not thread-safe by queueing a call into tcpip_thread to free ooseq-bufs if the pool is empty

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This commit is contained in:
goldsimon 2009-11-29 11:57:35 +00:00
parent 902ad897b8
commit aeef0a21f3
2 changed files with 61 additions and 25 deletions
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4
CHANGELOG
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@ -46,6 +46,10 @@ HISTORY
++ Bugfixes:
2009-11-29: Simon Goldschmidt
* pbuf.c: Fixed bug #28064: pbuf_alloc(PBUF_POOL) is not thread-safe by
queueing a call into tcpip_thread to free ooseq-bufs if the pool is empty
2009-11-26: Simon Goldschmidt
* tcp.h: Fixed bug #28098: Nagle can prevent fast retransmit from sending
segment

82
src/core/pbuf.c
View File

@ -81,41 +81,71 @@
aligned there. Therefore, PBUF_POOL_BUFSIZE_ALIGNED can be used here. */
#define PBUF_POOL_BUFSIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(PBUF_POOL_BUFSIZE)
#if TCP_QUEUE_OOSEQ
#define ALLOC_POOL_PBUF(p) do { (p) = alloc_pool_pbuf(); } while (0)
#else
#define ALLOC_POOL_PBUF(p) do { (p) = memp_malloc(MEMP_PBUF_POOL); } while (0)
#endif
#if !TCP_QUEUE_OOSEQ || NO_SYS
#define PBUF_POOL_IS_EMPTY()
#else /* !TCP_QUEUE_OOSEQ || NO_SYS */
/** Define this to 0 to prevent freeing ooseq pbufs when the PBUF_POOL is empty */
#ifndef PBUF_POOL_FREE_OOSEQ
#define PBUF_POOL_FREE_OOSEQ 1
#endif /* PBUF_POOL_FREE_OOSEQ */
#if TCP_QUEUE_OOSEQ
#if PBUF_POOL_FREE_OOSEQ
#include "lwip/tcpip.h"
#define PBUF_POOL_IS_EMPTY() pbuf_pool_is_empty()
static u8_t pbuf_free_ooseq_queued;
/**
* Attempt to reclaim some memory from queued out-of-sequence TCP segments
* if we run out of pool pbufs. It's better to give priority to new packets
* if we're running out.
*
* @return the allocated pbuf.
* This must be done in the correct thread context therefore this function
* can only be used with NO_SYS=0 and through tcpip_callback.
*/
static struct pbuf *
alloc_pool_pbuf(void)
static void
pbuf_free_ooseq(void* arg)
{
struct tcp_pcb *pcb;
struct pbuf *p;
struct tcp_pcb* pcb;
SYS_ARCH_DECL_PROTECT(old_level);
LWIP_UNUSED_ARG(arg);
retry:
p = memp_malloc(MEMP_PBUF_POOL);
if (NULL == p) {
for (pcb=tcp_active_pcbs; NULL != pcb; pcb = pcb->next) {
if (NULL != pcb->ooseq) {
tcp_segs_free(pcb->ooseq);
pcb->ooseq = NULL;
goto retry;
}
SYS_ARCH_PROTECT(old_level);
pbuf_free_ooseq_queued = 0;
SYS_ARCH_UNPROTECT(old_level);
for (pcb = tcp_active_pcbs; NULL != pcb; pcb = pcb->next) {
if (NULL != pcb->ooseq) {
/** Free the ooseq pbufs of one PCB only */
LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_free_ooseq: freeing out-of-sequence pbufs\n"));
tcp_segs_free(pcb->ooseq);
pcb->ooseq = NULL;
return;
}
}
return p;
}
#endif /* TCP_QUEUE_OOSEQ */
/** Queue a call to pbuf_free_ooseq if not already queued. */
static void
pbuf_pool_is_empty(void)
{
u8_t queued;
SYS_ARCH_DECL_PROTECT(old_level);
SYS_ARCH_PROTECT(old_level);
queued = pbuf_free_ooseq_queued;
pbuf_free_ooseq_queued = 1;
SYS_ARCH_UNPROTECT(old_level);
if(!queued) {
/* queue a call to pbuf_free_ooseq if not already queued */
if(tcpip_callback_with_block(pbuf_free_ooseq, NULL, 0) != ERR_OK) {
SYS_ARCH_PROTECT(old_level);
pbuf_free_ooseq_queued = 0;
SYS_ARCH_UNPROTECT(old_level);
}
}
}
#endif /* PBUF_POOL_FREE_OOSEQ */
#endif /* !TCP_QUEUE_OOSEQ || NO_SYS */
/**
* Allocates a pbuf of the given type (possibly a chain for PBUF_POOL type).
@ -181,9 +211,10 @@ pbuf_alloc(pbuf_layer layer, u16_t length, pbuf_type type)
switch (type) {
case PBUF_POOL:
/* allocate head of pbuf chain into p */
ALLOC_POOL_PBUF(p);
p = memp_malloc(MEMP_PBUF_POOL);
LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_alloc: allocated pbuf %p\n", (void *)p));
if (p == NULL) {
PBUF_POOL_IS_EMPTY();
return NULL;
}
p->type = type;
@ -213,8 +244,9 @@ pbuf_alloc(pbuf_layer layer, u16_t length, pbuf_type type)
rem_len = length - p->len;
/* any remaining pbufs to be allocated? */
while (rem_len > 0) {
ALLOC_POOL_PBUF(q);
q = memp_malloc(MEMP_PBUF_POOL);
if (q == NULL) {
PBUF_POOL_IS_EMPTY();
/* free chain so far allocated */
pbuf_free(p);
/* bail out unsuccesfully */