# \[PATCH net-next v2 02/14\] ravb: Add rx\_max\_buf\_size to struct ravb\_hw\_info - From: Biju Das \ - Date: 2021-10-10 07:29:36 - List: netdev - Page: https://ratatoskr.run/netdev/2021/10/9334494 - Thread: https://ratatoskr.run/netdev/2021/10/9334492/t.md ```text 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 Reviewed-by: Lad Prabhakar Reviewed-by: Sergey Shtylyov --- V1->v2: * No change RFC->V1: * No Change. Added Sergey's Rb tag --- 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 56a97d583950..ed0328a90200 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 = ALIGN(GBETH_RX_BUFF_MAX, RAVB_ALIGN), .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 ```