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[v6,09/12] net/tcp: define a fallback value for rcv_wnd size

Message ID 20240909222720.2563118-10-mikhail.kshevetskiy@iopsys.eu
State New
Delegated to: Ramon Fried
Headers show
Series net: tcp: improve tcp support | expand

Commit Message

Mikhail Kshevetskiy Sept. 9, 2024, 10:27 p.m. UTC 
Some driver implements it's own network packet pool, so PKTBUFSRX is zero.
This results in zero-size TCP receive window, so data transfer doesn't
work. Avoid it by setting a reasonable fallback value.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 net/tcp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/net/tcp.c b/net/tcp.c
index 0778c153aca..32ee1fe03ce 100644
--- a/net/tcp.c
+++ b/net/tcp.c
@@ -36,7 +36,11 @@ 
 #define TCP_SEND_RETRY		3
 #define TCP_SEND_TIMEOUT	2000UL
 #define TCP_RX_INACTIVE_TIMEOUT	30000UL
-#define TCP_RCV_WND_SIZE	(PKTBUFSRX * TCP_MSS)
+#if PKTBUFSRX != 0
+  #define TCP_RCV_WND_SIZE	(PKTBUFSRX * TCP_MSS)
+#else
+  #define TCP_RCV_WND_SIZE	(4 * TCP_MSS)
+#endif
 
 #define TCP_PACKET_OK		0
 #define TCP_PACKET_DROP		1