R-Car AVB-DMAC has maximum 2K size on RX buffer, whereas on RZ/G2L
it is 8K. We need to allow for changing the MTU within the limit
of the maximum size of a descriptor.
Add a rx_max_buf_size variable to struct ravb_hw_info to handle
this difference.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
RFC->v1:
* used buffer_size instead of feature bit.
---
drivers/net/ethernet/renesas/ravb.h | 1 +
drivers/net/ethernet/renesas/ravb_main.c | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 5dc1324786e0..b147c4a0dc0b 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1010,6 +1010,7 @@ struct ravb_hw_info {
int stats_len;
size_t max_rx_len;
u32 tsrq;
+ u32 rx_max_buf_size;
unsigned aligned_tx: 1;
/* hardware features */
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 9a4888543384..0d1e3f7d8c33 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2188,6 +2188,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {
.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
.tsrq = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
+ .rx_max_buf_size = SZ_2K,
.internal_delay = 1,
.tx_counters = 1,
.multi_irqs = 1,
@@ -2212,6 +2213,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = {
.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
.tsrq = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
+ .rx_max_buf_size = SZ_2K,
.aligned_tx = 1,
.gptp = 1,
.nc_queue = 1,
@@ -2229,6 +2231,7 @@ static const struct ravb_hw_info gbeth_hw_info = {
.emac_init = ravb_emac_init_gbeth,
.max_rx_len = GBETH_RX_BUFF_MAX + RAVB_ALIGN - 1,
.tsrq = TCCR_TSRQ0,
+ .rx_max_buf_size = SZ_8K,
.aligned_tx = 1,
.tx_counters = 1,
.half_duplex = 1,
@@ -2452,7 +2455,7 @@ 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->max_mtu = info->rx_max_buf_size - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
ndev->min_mtu = ETH_MIN_MTU;
/* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer
--
2.17.1
