[PATCH 4.14 30/65] net: stmmac: Enable 16KB buffer size

Greg Kroah-Hartman
2020-01-22T09:40:00Z

From: Jose Abreu <Jose.Abreu@synopsys.com>

commit b2f3a481c4cd62f78391b836b64c0a6e72b503d2 upstream.

XGMAC supports maximum MTU that can go to 16KB. Lets add this check in
the calculation of RX buffer size.

Fixes: 7ac6653a085b ("stmmac: Move the STMicroelectronics driver")
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1043,7 +1043,9 @@ static int stmmac_set_bfsize(int mtu, in
{
int ret = bufsize;

- if (mtu >= BUF_SIZE_4KiB)
+ if (mtu >= BUF_SIZE_8KiB)
+ ret = BUF_SIZE_16KiB;
+ else if (mtu >= BUF_SIZE_4KiB)
ret = BUF_SIZE_8KiB;
else if (mtu >= BUF_SIZE_2KiB)
ret = BUF_SIZE_4KiB;