From 8e8105a4deb9813d114dde83581a08f528b9f4ff Mon Sep 17 00:00:00 2001
From: zhengjiebing <zhengjiebing_yewu@cmss.chinamobile.com>
Date: Tue, 28 May 2024 21:50:27 +0800
Subject: [PATCH] modify max data len

---
 0137-modify-max-data-len.patch | 60 ++++++++++++++++++++++++++++++++++
 lwip.spec                      |  5 ++-
 2 files changed, 64 insertions(+), 1 deletion(-)
 create mode 100644 0137-modify-max-data-len.patch

diff --git a/0137-modify-max-data-len.patch b/0137-modify-max-data-len.patch
new file mode 100644
index 0000000..9e43d24
--- /dev/null
+++ b/0137-modify-max-data-len.patch
@@ -0,0 +1,60 @@
+diff --git a/src/core/ipv4/ip4.c b/src/core/ipv4/ip4.c
+index 0bbeefc..2d32c69 100644
+--- a/src/core/ipv4/ip4.c
++++ b/src/core/ipv4/ip4.c
+@@ -1091,6 +1091,10 @@ ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *d
+     }
+ #if GAZELLE_ENABLE
+   }
++  if (netif->mtu && (p->tot_len > netif->mtu)) {
++    u8_t nxt_hlen = (proto == IP_PROTO_TCP ? TCP_HLEN : UDP_HLEN);
++    pbuf_set_tso(p, netif->mtu - IP_HLEN - nxt_hlen);
++  }
+ #endif
+ #endif /* IP_FRAG */
+ #if GAZELLE_ENABLE
+diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
+index 9017d87..d369673 100644
+--- a/src/core/ipv6/ip6.c
++++ b/src/core/ipv6/ip6.c
+@@ -1286,6 +1286,10 @@ ip6_output_if_src(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
+     }
+ #if GAZELLE_ENABLE
+   }
++  if (netif->mtu6 && (p->tot_len > netif->mtu6)) {
++    u8_t nxt_hlen = (nexth == IP_PROTO_TCP ? TCP_HLEN : UDP_HLEN);
++    pbuf_set_tso(p, netif->mtu6 - IP6_HLEN - nxt_hlen);
++  }
+ #endif
+ #endif /* LWIP_IPV6_FRAG */
+ 
+diff --git a/src/include/dpdk_cksum.h b/src/include/dpdk_cksum.h
+index 115155d..e3cb304 100644
+--- a/src/include/dpdk_cksum.h
++++ b/src/include/dpdk_cksum.h
+@@ -61,6 +61,12 @@ static inline void pbuf_set_vlan(struct pbuf *p, u16_t vlan_tci)
+     PBUF_TO_MBUF(p)->vlan_tci = vlan_tci;
+ }
+ 
++static inline void pbuf_set_tso(struct pbuf *p, u16_t mss)
++{
++    PBUF_TO_MBUF(p)->ol_flags |= RTE_MBUF_F_TX_TCP_SEG;
++    PBUF_TO_MBUF(p)->tso_segsz = mss;
++}
++
+ #if CHECKSUM_CHECK_IP_HW
+ // for ip4_input
+ static inline u64_t is_cksum_ipbad(struct pbuf *p) {
+diff --git a/src/include/lwipopts.h b/src/include/lwipopts.h
+index 4655388..9f2447f 100644
+--- a/src/include/lwipopts.h
++++ b/src/include/lwipopts.h
+@@ -215,7 +215,7 @@
+ #define TCP_OVERSIZE TCP_MSS
+ #define LWIP_NETIF_TX_SINGLE_PBUF 1
+ 
+-#define TCP_MSS (FRAME_MTU - IP6_HLEN - TCP_HLEN - VLAN_LEN)
++#define TCP_MSS (FRAME_MTU - IP_HLEN - TCP_HLEN)
+ 
+ #define TCP_WND (2500 * TCP_MSS)
+ 
diff --git a/lwip.spec b/lwip.spec
index 20b6d2a..632c139 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: 2.2.0
-Release: 29
+Release: 30
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -177,6 +177,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Wed May 29 2024 zhengjiebing <zhengjiebing@cmss.chinamobile.com> - 2.2.0-30
+- modify max data len
+
 * Fri May 24 2024 zhengjiebing <zhengjiebing@cmss.chinamobile.com> - 2.2.0-29
 - fix vlan filter bug
 
-- 
Gitee