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Updated comment in low_level_input() about pbuf len vs. tot_len if using preallocated pbufs (as requested in bug #27576: pbuf_realloc will assert or crash on a non-chained pbuf list)

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goldsimon 2009-10-09 19:56:54 +00:00
parent 6ef69ece95
commit c34c024dd5
1 changed files with 7 additions and 2 deletions
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9
src/netif/ethernetif.c
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@ -45,7 +45,7 @@
#include "lwip/opt.h" #include "lwip/opt.h"
#if 0 /* don't build, this is only a skeleton, see previous comment */ #if 1 /* don't build, this is only a skeleton, see previous comment */
#include "lwip/def.h" #include "lwip/def.h"
#include "lwip/mem.h" #include "lwip/mem.h"
@ -187,7 +187,12 @@ low_level_input(struct netif *netif)
for(q = p; q != NULL; q = q->next) { for(q = p; q != NULL; q = q->next) {
/* Read enough bytes to fill this pbuf in the chain. The /* Read enough bytes to fill this pbuf in the chain. The
* available data in the pbuf is given by the q->len * available data in the pbuf is given by the q->len
* variable. */ * variable.
* This does not necessarily have to be a memcpy, you can also preallocate
* pbufs for a DMA-enabled MAC and after receiving truncate it to the
* actually received size. In this case, ensure the tot_len member of the
* pbuf is the sum of the chained pbuf len members.
*/
read data into(q->payload, q->len); read data into(q->payload, q->len);
} }
acknowledge that packet has been read(); acknowledge that packet has been read();