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TCP data can be safely referenced as PBUF_ROM instead of PBUF_REF.

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This commit is contained in:
likewise 2003-04-07 21:28:16 +00:00
parent a3087737bd
commit a4a7a7a47e
1 changed files with 10 additions and 6 deletions
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16
src/core/tcp_out.c
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@ -167,14 +167,14 @@ tcp_enqueue(struct tcp_pcb *pcb, void *arg, u16_t len,
and data copied into pbuf, otherwise data comes from
ROM or other static memory, and need not be copied. If
optdata is != NULL, we have options instead of data. */
if(optdata != NULL) {
if (optdata != NULL) {
if((seg->p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
goto memerr;
}
++queuelen;
seg->dataptr = seg->p->payload;
}
else if(copy) {
else if (copy) {
if((seg->p = pbuf_alloc(PBUF_TRANSPORT, seglen, PBUF_RAM)) == NULL) {
DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_enqueue: could not allocate memory for pbuf copy size %u\n", seglen));
goto memerr;
@ -185,12 +185,16 @@ tcp_enqueue(struct tcp_pcb *pcb, void *arg, u16_t len,
}
seg->dataptr = seg->p->payload;
}
/* do not copy data */
else {
/* Do not copy the data. */
/* First, allocate a pbuf for holding the data. */
if((p = pbuf_alloc(PBUF_TRANSPORT, seglen, PBUF_REF)) == NULL) {
DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_enqueue: could not allocate memory for pbuf non-copy\n"));
/* first, allocate a pbuf for holding the data.
* since the referenced data is available at least until it is sent out on the
* link (as it has to be ACKed by the remote party) we can safely use PBUF_ROM
* instead of PBUF_REF here.
*/
if((p = pbuf_alloc(PBUF_TRANSPORT, seglen, PBUF_ROM)) == NULL) {
DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_enqueue: could not allocate memory for zero-copy pbuf\n"));
goto memerr;
}
++queuelen;