From d9e656c6ca48367fdc174b00c64d6f3fb0584a38 Mon Sep 17 00:00:00 2001
From: jiangheng <jiangheng14@huawei.com>
Date: Mon, 5 Feb 2024 15:09:14 +0800
Subject: [PATCH] add huge snd_buf

---
 src/core/init.c         | 2 +-
 src/core/pbuf.c         | 9 ++++++---
 src/include/lwip/opt.h  | 2 +-
 src/include/lwip/pbuf.h | 2 +-
 src/include/lwipopts.h  | 2 +-
 5 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/core/init.c b/src/core/init.c
index 5b60ed8..6841857 100644
--- a/src/core/init.c
+++ b/src/core/init.c
@@ -312,7 +312,7 @@ PACK_STRUCT_END
 #if TCP_MSS >= ((16 * 1024) - 1)
 #error "lwip_sanity_check: WARNING: TCP_MSS must be <= 16382 to prevent u16_t underflow in TCP_SNDLOWAT calculation!"
 #endif
-#if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
+#if TCP_SNDLOWAT >= (0xFFFFFFFF - (4 * TCP_MSS))
 #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
 #endif
 #if TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN
diff --git a/src/core/pbuf.c b/src/core/pbuf.c
index 69a52b6..bea0e81 100644
--- a/src/core/pbuf.c
+++ b/src/core/pbuf.c
@@ -871,13 +871,13 @@ pbuf_cat(struct pbuf *h, struct pbuf *t)
   /* proceed to last pbuf of chain */
   for (p = h; p->next != NULL; p = p->next) {
     /* add total length of second chain to all totals of first chain */
-    p->tot_len = (u16_t)(p->tot_len + t->tot_len);
+    p->tot_len = p->tot_len + t->tot_len;
   }
   /* { p is last pbuf of first h chain, p->next == NULL } */
   LWIP_ASSERT("p->tot_len == p->len (of last pbuf in chain)", p->tot_len == p->len);
   LWIP_ASSERT("p->next == NULL", p->next == NULL);
   /* add total length of second chain to last pbuf total of first chain */
-  p->tot_len = (u16_t)(p->tot_len + t->tot_len);
+  p->tot_len = p->tot_len + t->tot_len;
   /* chain last pbuf of head (p) with first of tail (t) */
   p->next = t;
   /* p->next now references t, but the caller will drop its reference to t,
@@ -1178,7 +1178,7 @@ void pbuf_split_64k(struct pbuf *p, struct pbuf **rest)
     if (r != NULL) {
       /* Update the tot_len field in the first part */
       for (i = p; i != NULL; i = i->next) {
-        i->tot_len = (u16_t)(i->tot_len - r->tot_len);
+        i->tot_len = tot_len_front;
         LWIP_ASSERT("tot_len/len mismatch in last pbuf",
                     (i->next != NULL) || (i->tot_len == i->len));
       }
@@ -1189,6 +1189,9 @@ void pbuf_split_64k(struct pbuf *p, struct pbuf **rest)
       /* tot_len field in rest does not need modifications */
       /* reference counters do not need modifications */
       *rest = r;
+      r->tot_len = r->len;
+    }else{
+      p->tot_len = tot_len_front;
     }
   }
 }
diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index b738460..570d2de 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1533,7 +1533,7 @@
  * send window while having a small receive window only.
  */
 #if !defined LWIP_WND_SCALE || defined __DOXYGEN__
-#define LWIP_WND_SCALE                  0
+#define LWIP_WND_SCALE                  1
 #define TCP_RCV_SCALE                   0
 #endif
 
diff --git a/src/include/lwip/pbuf.h b/src/include/lwip/pbuf.h
index b362007..60d8d1a 100644
--- a/src/include/lwip/pbuf.h
+++ b/src/include/lwip/pbuf.h
@@ -197,7 +197,7 @@ struct pbuf {
    * For non-queue packet chains this is the invariant:
    * p->tot_len == p->len + (p->next? p->next->tot_len: 0)
    */
-  u16_t tot_len;
+  u32_t tot_len;
 
   /** length of this buffer */
   u16_t len;
diff --git a/src/include/lwipopts.h b/src/include/lwipopts.h
index 7c819d0..d7b9635 100644
--- a/src/include/lwipopts.h
+++ b/src/include/lwipopts.h
@@ -97,7 +97,7 @@
 
 #define TCP_WND (40 * TCP_MSS)
 
-#define TCP_SND_BUF (40 * TCP_MSS)
+#define TCP_SND_BUF (2500 * TCP_MSS)
 
 #define TCP_SND_QUEUELEN (8191)
 
-- 
2.33.0