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net: lwip: Fix PBUF_POOL_BUFSIZE when PROT_TCP_LWIP is disabled

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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 constant depends on the value
of a TCP_MSS constant, something that defaults to 536 when PROT_TCP_LWIP
is disabled.

  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: 1c41a7afaa ("net: lwip: build lwIP")
Acked-by: Jerome Forissier <jerome.forissier@arm.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
This commit is contained in:
Jonas Karlman
2026-03-09 21:06:39 +00:00
committed by Tom Rini
parent 1939a7f7fb
commit b3ee14ea6d
1 changed files with 5 additions and 1 deletions
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6
lib/lwip/u-boot/lwipopts.h
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@@ -121,9 +121,13 @@
#define LWIP_UDP 0
#endif
/*
* PBUF_POOL_BUFSIZE is derived from TCP_MSS even when
* CONFIG_PROT_TCP_LWIP is not defined
*/
#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