[RFC/PATCH 11/18] ravb: Add rx_2k_buffers to struct ravb_hw_info
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: 2021-09-23 14:09:01
Also in:
linux-renesas-soc
Subsystem:
networking drivers, renesas ethernet avb driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Niklas Söderlund, Linus Torvalds
R-Car AVB-DMAC has Maximum 2K size on RZ buffer. We need to Allow for changing the MTU within the limit of the maximum size of a descriptor (2048 bytes). Add a rx_2k_buffers hw feature bit to struct ravb_hw_info to add this constraint only for R-Car. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++-- 2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 7532cb51d7b8..ab4909244276 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h@@ -1033,6 +1033,7 @@ struct ravb_hw_info { unsigned magic_pkt:1; /* E-MAC supports magic packet detection */ unsigned mii_rgmii_selection:1; /* E-MAC supports mii/rgmii selection */ unsigned half_duplex:1; /* E-MAC supports half duplex mode */ + unsigned rx_2k_buffers:1; /* AVB-DMAC has Max 2K buf size on RX */ }; struct ravb_private {
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 7f06adbd00e1..9c0d35f4b221 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c@@ -2164,6 +2164,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = { .ccc_gac = 1, .multi_tsrq = 1, .magic_pkt = 1, + .rx_2k_buffers = 1, }; static const struct ravb_hw_info ravb_gen2_hw_info = {
@@ -2184,6 +2185,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = { .aligned_tx = 1, .multi_tsrq = 1, .magic_pkt = 1, + .rx_2k_buffers = 1, }; static const struct ravb_hw_info rgeth_hw_info = {
@@ -2417,8 +2419,10 @@ static int ravb_probe(struct platform_device *pdev) } clk_prepare_enable(priv->refclk); - ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); - ndev->min_mtu = ETH_MIN_MTU; + if (info->rx_2k_buffers) { + ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); + ndev->min_mtu = ETH_MIN_MTU; + } /* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer * Use two descriptor to handle such situation. First descriptor to
--
2.17.1