fix(lwip): fix exist more pbufs after TX_SINGLE_PBUF enabled
@@ -481,6 +481,7 @@ tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
LWIP_ASSERT("inconsistent oversize vs. len", (oversize == 0) || (pos == len));
#endif /* TCP_OVERSIZE */
+#if !LWIP_NETIF_TX_SINGLE_PBUF
/*
* Phase 2: Chain a new pbuf to the end of pcb->unsent.
*
@@ -491,6 +492,10 @@ tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
* We don't extend segments containing SYN/FIN flags or options
* (len==0). The new pbuf is kept in concat_p and pbuf_cat'ed at
* the end.
+ *
+ * This phase is skipped for LWIP_NETIF_TX_SINGLE_PBUF as we could only execute
+ * it after rexmit puts a segment from unacked to unsent and at this point,
+ * oversize info is lost.
*/
if ((pos < len) && (space > 0) && (last_unsent->len > 0)) {
u16_t seglen = LWIP_MIN(space, len - pos);
@@ -543,6 +548,7 @@ tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
pos += seglen;
}
+#endif /* !LWIP_NETIF_TX_SINGLE_PBUF */
} else {
#if TCP_OVERSIZE
LWIP_ASSERT("unsent_oversize mismatch (pcb->unsent is NULL)",
