diff --git a/0040-add-huge-snd_buf.patch b/0040-add-huge-snd_buf.patch
new file mode 100644
index 0000000000000000000000000000000000000000..73fa142f56c1c77af51accd6160a6cf885266bdc
--- /dev/null
+++ b/0040-add-huge-snd_buf.patch
@@ -0,0 +1,86 @@
+diff -Nur lwip-2.1.3-org/src/core/init.c lwip-2.1.3/src/core/init.c
+--- lwip-2.1.3-org/src/core/init.c	2022-12-06 14:40:45.280000000 +0000
++++ lwip-2.1.3/src/core/init.c	2022-12-06 14:41:01.452000000 +0000
+@@ -306,7 +306,7 @@
+ #if TCP_SNDLOWAT >= TCP_SND_BUF
+ #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+ #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 -Nur lwip-2.1.3-org/src/core/pbuf.c lwip-2.1.3/src/core/pbuf.c
+--- lwip-2.1.3-org/src/core/pbuf.c	2022-12-06 14:40:45.280000000 +0000
++++ lwip-2.1.3/src/core/pbuf.c	2022-12-06 14:46:04.860000000 +0000
+@@ -869,13 +869,13 @@
+   /* 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,
+@@ -1181,7 +1181,7 @@
+     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));
+       }
+@@ -1192,6 +1192,9 @@
+       /* 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 -Nur lwip-2.1.3-org/src/include/lwip/opt.h lwip-2.1.3/src/include/lwip/opt.h
+--- lwip-2.1.3-org/src/include/lwip/opt.h	2022-12-06 14:40:45.292000000 +0000
++++ lwip-2.1.3/src/include/lwip/opt.h	2022-12-06 14:41:01.456000000 +0000
+@@ -1482,7 +1482,7 @@
+  * 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 -Nur lwip-2.1.3-org/src/include/lwip/pbuf.h lwip-2.1.3/src/include/lwip/pbuf.h
+--- lwip-2.1.3-org/src/include/lwip/pbuf.h	2022-12-06 14:40:45.284000000 +0000
++++ lwip-2.1.3/src/include/lwip/pbuf.h	2022-12-06 14:46:36.720000000 +0000
+@@ -197,7 +197,7 @@
+    * 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 -Nur lwip-2.1.3-org/src/include/lwipopts.h lwip-2.1.3/src/include/lwipopts.h
+--- lwip-2.1.3-org/src/include/lwipopts.h	2022-12-06 14:40:45.292000000 +0000
++++ lwip-2.1.3/src/include/lwipopts.h	2022-12-06 14:41:01.456000000 +0000
+@@ -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)
+ 
diff --git a/lwip.spec b/lwip.spec
index 771323761522688d32234751aa2b608963b902d6..8de4340979a963cb5c524243bdd1e6f5dd915f46 100644
--- a/lwip.spec
+++ b/lwip.spec
@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.1.3
-Release: 28
+Release: 29
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -51,6 +51,7 @@ Patch9035:  0036-add-fs-secure-compilation-option.patch
 Patch9036:  0037-enable-ARP-QUEUE-to-avoid-sync-packet-dropped.patch
 Patch9037:  0038-add-tso.patch
 Patch9038:  0039-optimize-app-thread-write-buff-block.patch
+Patch9039:  0040-add-huge-snd_buf.patch
 
 BuildRequires: gcc-c++ dos2unix dpdk-devel
 
@@ -106,6 +107,7 @@ find %{_builddir}/%{name}-%{version} -type f -exec dos2unix -q {} \;
 %patch9036 -p1
 %patch9037 -p1
 %patch9038 -p1
+%patch9039 -p1
 
 %build
 cd %{_builddir}/%{name}-%{version}/src
@@ -121,6 +123,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Tue Dec 6 2022 zhujunhao<zhujunhao11@huawei.com> - 2.1.3-29
+- add huge snd_buf
+
 * Sat Dec 3 2022 wuchangsheng<wuchangsheng2@huawei.com> - 2.1.3-28
 - add tso define