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lwip: revise the tcp ooseq limit calulations.

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Was making a mess of the calculation sign.

Also added a COPY_PP_RX_PBUFS define to include appropriate limits
for this option.
This commit is contained in:
Our Air Quality 2017-09-04 17:18:52 +10:00
parent 49f7951013
commit 730a0f40c7
1 changed files with 25 additions and 4 deletions
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29
lwip/esp_interface.c
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@ -152,30 +152,51 @@ void pp_recycle_rx_pbuf(struct pbuf *p)
LWIP_ASSERT("expected esf_buf", p->esf_buf);
sdk_system_pp_recycle_rx_pkt(p->esf_buf);
taskENTER_CRITICAL();
LWIP_ASSERT("pp_rx_pool_usage underflow", pp_rx_pool_usage > 0);
pp_rx_pool_usage--;
taskEXIT_CRITICAL();
}
/* Set to true to copy the rx pbufs on input and free them. The pp rx buffer
* pool is limited so this allows a large number at the expense of memory.
*/
#define COPY_PP_RX_PBUFS 0
/* Return the number of ooseq bytes that can be retained given the current
* size 'n'. */
size_t ooseq_max_bytes(size_t n)
{
#if COPY_PP_RX_PBUFS
size_t free = xPortGetFreeHeapSize();
size_t target = (free - 30000) + n;
ssize_t target = ((ssize_t)free - 30000) + n;
if (target < 0) {
target = 0;
}
return target;
#else
/* The pool is pre-allocated so there is no need to look at the dynamic
* memory usage, just consider the number of them below. */
return 8000;
#endif
}
/* Return the number of ooseq pbufs that can be retained given the current
* size 'n'. */
size_t ooseq_max_pbufs(size_t n)
{
uint32_t usage = pp_rx_pool_usage;
size_t target = 3 - (usage - n);
#if COPY_PP_RX_PBUFS
/* More likely memory limited, but set some limit. */
ssize_t limit = 10;
#else
/* Set a small limit if using the pp rx pool, to avoid exhausting it. */
ssize_t limit = 2;
#endif
size_t usage = pp_rx_pool_usage;
ssize_t target = limit - ((ssize_t)usage - n);
if (target < 0) {
target = 0;
@ -239,7 +260,7 @@ void ethernetif_input(struct netif *netif, struct pbuf *p)
{
/* full packet send to tcpip_thread to process */
#if 0
#if COPY_PP_RX_PBUFS
/* Optionally copy the rx pool buffer and free it immediately. This
* helps avoid exhausting the limited rx buffer pool but uses more
* memory. */