The PBUF_POOL_BUFSIZE ends up being only 592 bytes, instead of 1514,
when PROT_TCP_LWIP Kconfig option is disabled. This results in a full
Ethernet frame requiring three PBUFs instead of just one.
This happens because the PBUF_POOL_BUFSIZE constants depends on the
value of a TCP_MSS constant, something that defaults to 536 when
PROT_TCP_LWIP=n.
PBUF_POOL_BUFSIZE = LWIP_MEM_ALIGN_SIZE(TCP_MSS + 40 + PBUF_LINK_HLEN)
Ensure that a full Ethernet frame fits inside a single PBUF by moving
the define of TCP_MSS outside the PROT_TCP_LWIP ifdef block.
Fixes: 1c41a7afaa15 ("net: lwip: build lwIP")
Signed-off-by: Jonas Karlman <[email protected]>
---
lib/lwip/u-boot/lwipopts.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/lwip/u-boot/lwipopts.h b/lib/lwip/u-boot/lwipopts.h
index e8a2c9d7a0a6..96aae3ad1f4f 100644
--- a/lib/lwip/u-boot/lwipopts.h
+++ b/lib/lwip/u-boot/lwipopts.h
@@ -121,9 +121,9 @@
#define LWIP_UDP 0
#endif
+#define TCP_MSS 1460
#if defined(CONFIG_PROT_TCP_LWIP)
#define LWIP_TCP 1
-#define TCP_MSS 1460
#define TCP_WND CONFIG_LWIP_TCP_WND
#define LWIP_WND_SCALE 1
#define TCP_RCV_SCALE 0x7
--
2.53.0
