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Date: Mon, 19 Jul 2021 23:41:45 +0300
From: Sergei Shtylyov <sergei.shtylyov@...il.com>
To: Biju Das <biju.das.jz@...renesas.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
Sergey Shtylyov <s.shtylyov@...russia.ru>,
Adam Ford <aford173@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Yuusuke Ashizuka <ashiduka@...itsu.com>,
netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
Chris Paterson <Chris.Paterson2@...esas.com>,
Biju Das <biju.das@...renesas.com>,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH/RFC 2/2] ravb: Add GbEthernet driver support
Hello!
On 7/14/21 5:54 PM, Biju Das wrote:
> Add Gigabit Ethernet driver support.
>
> The Gigabit Etherner IP consists of Ethernet controller (E-MAC),
> Internal TCP/IP Offload Engine (TOE) and Dedicated Direct memory
> access controller (DMAC).
>
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> ---
> drivers/net/ethernet/renesas/ravb.h | 92 ++-
> drivers/net/ethernet/renesas/ravb_main.c | 683 ++++++++++++++++++++---
> 2 files changed, 682 insertions(+), 93 deletions(-)
>
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index 80e62ca2e3d3..4e65683fb458 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
[...]
> @@ -181,25 +183,39 @@ enum ravb_reg {
>
> /* E-MAC registers */
> ECMR = 0x0500,
> + CXR20 = 0x0500, /* Documented for RZ/G2L only */
This is the same register as ECMR. Those cryptic CXR<n> names we first encountered in
the R-Car gen1 SoCs. :-)
> RFLR = 0x0508,
> + CXR2A = 0x0508, /* Documented for RZ/G2L only */
Same comment -- no need to re-#define the macro.
[...]
> @@ -216,6 +232,7 @@ enum CCC_BIT {
> CCC_CSEL_HPB = 0x00010000,
> CCC_CSEL_ETH_TX = 0x00020000,
> CCC_CSEL_GMII_REF = 0x00030000,
> + CCC_BOC = 0x00100000, /* Documented for RZ/G2L only */
Hm, where do you use it? I'm not seeing...
[...]
> @@ -804,16 +821,21 @@ enum TID_BIT {
> enum ECMR_BIT {
> ECMR_PRM = 0x00000001,
> ECMR_DM = 0x00000002,
> + CXR20_LPM = 0x00000010, /* Documented for RZ/G2L only */
Please use the ECMR_ prefix.
> ECMR_TE = 0x00000020,
> ECMR_RE = 0x00000040,
> ECMR_MPDE = 0x00000200,
> + CXR20_CER = 0x00001000, /* Documented for RZ/G2L only */
Ditto.
> ECMR_TXF = 0x00010000, /* Documented for R-Car Gen3 only */
> ECMR_RXF = 0x00020000,
> ECMR_PFR = 0x00040000,
> ECMR_ZPF = 0x00080000, /* Documented for R-Car Gen3 only */
> ECMR_RZPF = 0x00100000,
> ECMR_DPAD = 0x00200000,
> + CXR20_CXSER = 0x00400000, /* Documented for RZ/G2L only */
Ditto.
> ECMR_RCSC = 0x00800000,
> + CXR20_TCPT = 0x01000000, /* Documented for RZ/G2L only */
> + CXR20_RCPT = 0x02000000, /* Documented for RZ/G2L only */
Ditto.
[...]
> @@ -823,6 +845,7 @@ enum ECSR_BIT {
> ECSR_MPD = 0x00000002,
> ECSR_LCHNG = 0x00000004,
> ECSR_PHYI = 0x00000008,
> + ECSR_RFRI = 0x00000010, /* Documented for RZ/G2L only */
Not PFRI?
Also, my R-Car gen2/3 manual dociment the bit.
[...]
> @@ -862,6 +885,14 @@ enum GECMR_BIT {
> GECMR_SPEED_1000 = 0x00000001,
> };
>
> +/* GECMR */
> +enum RGETH_GECMR_BIT {
> + RGETH_GECMR_SPEED = 0x00000030,
> + RGETH_GECMR_SPEED_10 = 0x00000000,
> + RGETH_GECMR_SPEED_100 = 0x00000010,
> + RGETH_GECMR_SPEED_1000 = 0x00000020,
Why not place those values in the existing GECMR *enum* with the necessary annotations?
Also I think the prefixes should be GETH, not RGETH -- RAVB is the EtherAVB driver's name, not
the actual hardware...
[...]
> @@ -956,8 +1035,11 @@ enum RAVB_QUEUE {
>
> #define RX_BUF_SZ (2048 - ETH_FCS_LEN + sizeof(__sum16))
>
> +#define RGETH_RCV_BUFF_MAX 8192
> +#define RGETH_RCV_DESCRIPTOR_DATA_SIZE 4080
Please shorten DESCRIPTOR to DESC. And RCV_ should probably be renemed to R?..
[...]> @@ -1040,6 +1123,11 @@ struct ravb_private {
> unsigned txcidm:1; /* TX Clock Internal Delay Mode */
> unsigned rgmii_override:1; /* Deprecated rgmii-*id behavior */
> int num_tx_desc; /* TX descriptors per packet */
> +
> + int duplex;
> + struct ravb_rx_desc *rgeth_rx_ring[NUM_RX_QUEUE];
> + struct sk_buff *rxtop_skb;
> + struct reset_control *rstc;
I'd have apreciated some comments here... I don't quite understand what the first 3 are for...
[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 7e6feda59f4a..e28a63de553d 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]
> @@ -82,6 +83,23 @@ static int ravb_config(struct net_device *ndev)
> return error;
> }
>
> +static void rgeth_set_rate(struct net_device *ndev)
What about ravb_set_rate_rzgl? I think we use this convention in sh_eth.c...
[...]
> @@ -217,6 +235,29 @@ static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
> }
>
> /* Free skb's and DMA buffers for Ethernet AVB */
> +static void rgeth_ring_free_ex(struct net_device *ndev, int q)
It definitely should be called ravb_rx_ring_free_rgeth(), I think...
> +{
> + struct ravb_private *priv = netdev_priv(ndev);
> + int ring_size;
> + int i;
> +
> + for (i = 0; i < priv->num_rx_ring[q]; i++) {
> + struct ravb_rx_desc *desc = &priv->rgeth_rx_ring[q][i];
> +
> + if (!dma_mapping_error(ndev->dev.parent,
> + le32_to_cpu(desc->dptr)))
> + dma_unmap_single(ndev->dev.parent,
> + le32_to_cpu(desc->dptr),
> + RGETH_RCV_BUFF_MAX,
> + DMA_FROM_DEVICE);
> + }
> + ring_size = sizeof(struct ravb_rx_desc) *
> + (priv->num_rx_ring[q] + 1);
> + dma_free_coherent(ndev->dev.parent, ring_size, priv->rgeth_rx_ring[q],
> + priv->rx_desc_dma[q]);
> + priv->rgeth_rx_ring[q] = NULL;
> +}
> +
> static void ravb_ring_free_ex(struct net_device *ndev, int q)
> {
> struct ravb_private *priv = netdev_priv(ndev);
> @@ -247,8 +288,12 @@ static void ravb_ring_free(struct net_device *ndev, int q)
> int ring_size;
> int i;
>
> - if (priv->rx_ring[q]) {
> - ravb_ring_free_ex(ndev, q);
> + if (priv->chip_id == RZ_G2L) {
> + if (priv->rgeth_rx_ring[q])
> + rgeth_ring_free_ex(ndev, q);
> + } else {
> + if (priv->rx_ring[q])
> + ravb_ring_free_ex(ndev, q);
I definitely don't like that _ex suffix...
[...]
> @@ -281,6 +326,36 @@ static void ravb_ring_free(struct net_device *ndev, int q)
> }
>
> /* Format skb and descriptor buffer for Ethernet AVB */
> +static void rgeth_ring_format_ex(struct net_device *ndev, int q)
How about ravb_rx_ring_format_geth()?
> +{
> + struct ravb_private *priv = netdev_priv(ndev);
> + struct ravb_rx_desc *rx_desc;
> + int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
> + dma_addr_t dma_addr;
> + int i;
> +
> + memset(priv->rgeth_rx_ring[q], 0, rx_ring_size);
> + /* Build RX ring buffer */
> + for (i = 0; i < priv->num_rx_ring[q]; i++) {
> + /* RX descriptor */
> + rx_desc = &priv->rgeth_rx_ring[q][i];
> + rx_desc->ds_cc = cpu_to_le16(RGETH_RCV_DESCRIPTOR_DATA_SIZE);
Mhm, I think we should further parametrize the RX data in order to save the code duplication...
> + dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
> + RGETH_RCV_BUFF_MAX,
> + DMA_FROM_DEVICE);
> + /* We just set the data size to 0 for a failed mapping which
> + * should prevent DMA from happening...
> + */
> + if (dma_mapping_error(ndev->dev.parent, dma_addr))
> + rx_desc->ds_cc = cpu_to_le16(0);
> + rx_desc->dptr = cpu_to_le32(dma_addr);
> + rx_desc->die_dt = DT_FEMPTY;
> + }
> + rx_desc = &priv->rgeth_rx_ring[q][i];
> + rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
> + rx_desc->die_dt = DT_LINKFIX; /* type */
> +}
> +
> static void ravb_ring_format_ex(struct net_device *ndev, int q)
> {
> struct ravb_private *priv = netdev_priv(ndev);
> @@ -326,7 +401,10 @@ static void ravb_ring_format(struct net_device *ndev, int q)
> priv->dirty_tx[q] = 0;
>
> /* Build RX ring buffer */
> - ravb_ring_format_ex(ndev, q);
> + if (priv->chip_id == RZ_G2L)
> + rgeth_ring_format_ex(ndev, q);
> + else
> + ravb_ring_format_ex(ndev, q);
... so that we don't have alike code snippets anymore...
[...]
> @@ -356,7 +434,7 @@ static void ravb_ring_format(struct net_device *ndev, int q)
> static int ravb_ring_init(struct net_device *ndev, int q)
> {
> struct ravb_private *priv = netdev_priv(ndev);
> - size_t skb_sz = RX_BUF_SZ;
> + size_t skb_sz = (priv->chip_id == RZ_G2L) ? RGETH_RCV_BUFF_MAX : RX_BUF_SZ;
Should be also parametrized...
[...]
> @@ -414,6 +503,45 @@ static int ravb_ring_init(struct net_device *ndev, int q)
> }
>
> /* E-MAC init function */
> +static void rgeth_emac_init_ex(struct net_device *ndev)
> +{
> + struct ravb_private *priv = netdev_priv(ndev);
> +
> + /* Receive frame limit set register */
> + ravb_write(ndev, RGETH_RCV_BUFF_MAX + ETH_FCS_LEN, RFLR);
> +
> + /* PAUSE prohibition */
> + ravb_write(ndev, ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) |
> + ECMR_TE | ECMR_RE | CXR20_RCPT |
> + ECMR_TXF | ECMR_RXF | ECMR_PRM, ECMR);
> +
> + rgeth_set_rate(ndev);
> +
> + /* Set MAC address */
> + ravb_write(ndev,
> + (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
> + (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
> + ravb_write(ndev,
> + (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
> +
> + /* E-MAC status register clear */
> + ravb_write(ndev, ECSR_ICD | ECSR_LCHNG | ECSR_RFRI, ECSR);
> + ravb_write(ndev, CSR0_TPE | CSR0_RPE, CSR0);
> +
> + /* E-MAC interrupt enable register */
> + ravb_write(ndev, ECSIPR_ICDIP, ECSIPR);
> +
> + ravb_write(ndev, ravb_read(ndev, CXR31)
> + & ~CXR31_SEL_LINK1, CXR31);
> + if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID) {
> + ravb_write(ndev, ravb_read(ndev, CXR31)
> + | CXR31_SEL_LINK0, CXR31);
> + } else {
> + ravb_write(ndev, ravb_read(ndev, CXR31)
> + & ~CXR31_SEL_LINK0, CXR31);
> + }
> +}
The more I look at your patches, the more I think Geert's suggestion to mimic the sh_eth's
approach to handling the SoC differencies is worth using in this driver as well...
[...]
> @@ -442,10 +570,41 @@ static void ravb_emac_init_ex(struct net_device *ndev)
[...]
> /* Device init function for Ethernet AVB */
> +static void rgeth_dmac_init_ex(struct net_device *ndev)
> +{
> + /* Set AVB RX */
> + ravb_write(ndev, 0x60000000, RCR);
What those (undocumented?) bits mean, I wonder?
[...]
> @@ -545,6 +708,23 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
> }
> }
>
> +static void rgeth_rx_csum(struct sk_buff *skb)
> +{
> + u8 *hw_csum;
> +
> + /* The hardware checksum is contained in sizeof(__sum16) (2) bytes
> + * appended to packet data
> + */
> + if (unlikely(skb->len < sizeof(__sum16)))
> + return;
> + hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
> +
> + if (*hw_csum == 0)
> + skb->ip_summed = CHECKSUM_UNNECESSARY;
> + else
> + skb->ip_summed = CHECKSUM_NONE;
> +}
So does GbEth device sumpport checksuming or not?
[...]
> @@ -561,6 +741,143 @@ static void ravb_rx_csum(struct sk_buff *skb)
> }
>
> /* Packet receive function for Ethernet AVB */
> +struct sk_buff *rgeth_get_skb(struct net_device *ndev, int q, int entry,
Not *static*?
> + struct ravb_rx_desc *desc)
> +{
> + struct ravb_private *priv = netdev_priv(ndev);
> + struct sk_buff *skb;
> +
> + skb = priv->rx_skb[q][entry];
> + priv->rx_skb[q][entry] = NULL;
> + dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
> + ALIGN(RGETH_RCV_BUFF_MAX, 16), DMA_FROM_DEVICE);
> +
> + return skb;
> +}
> +
> +static bool rgeth_rx_ex(struct net_device *ndev, int *quota, int q)
> +{
> + struct ravb_private *priv = netdev_priv(ndev);
> + int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
> + int boguscnt = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
> + struct net_device_stats *stats = &priv->stats[q];
> + struct ravb_rx_desc *desc;
> + struct sk_buff *skb;
> + dma_addr_t dma_addr;
> + u8 desc_status;
> + u8 die_dt;
> + u16 pkt_len;
> + int limit;
> +
> + boguscnt = min(boguscnt, *quota);
> + limit = boguscnt;
> + desc = &priv->rgeth_rx_ring[q][entry];
> + while (desc->die_dt != DT_FEMPTY) {
> + /* Descriptor type must be checked before all other reads */
> + dma_rmb();
> + desc_status = desc->msc;
> + pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
> +
> + if (--boguscnt < 0)
> + break;
> +
> + /* We use 0-byte descriptors to mark the DMA mapping errors */
> + if (!pkt_len)
> + continue;
> +
> + if (desc_status & MSC_MC)
> + stats->multicast++;
> +
> + if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | MSC_CEEF)) {
> + stats->rx_errors++;
> + if (desc_status & MSC_CRC)
> + stats->rx_crc_errors++;
> + if (desc_status & MSC_RFE)
> + stats->rx_frame_errors++;
> + if (desc_status & (MSC_RTLF | MSC_RTSF))
> + stats->rx_length_errors++;
> + if (desc_status & MSC_CEEF)
> + stats->rx_missed_errors++;
> + } else {
> + die_dt = desc->die_dt & 0xF0;
> + if (die_dt == DT_FSINGLE) {
Why not *switch*?
> + skb = rgeth_get_skb(ndev, q, entry, desc);
> + skb_put(skb, pkt_len);
> + skb->protocol = eth_type_trans(skb, ndev);
> + if (ndev->features & NETIF_F_RXCSUM)
> + rgeth_rx_csum(skb);
> + napi_gro_receive(&priv->napi[q], skb);
> + stats->rx_packets++;
> + stats->rx_bytes += pkt_len;
> + } else if (die_dt == DT_FSTART) {
> + priv->rxtop_skb = rgeth_get_skb(ndev, q, entry, desc);
> + skb_put(priv->rxtop_skb, pkt_len);
> + } else if (die_dt == DT_FMID) {
> + skb = rgeth_get_skb(ndev, q, entry, desc);
> + skb_copy_to_linear_data_offset(priv->rxtop_skb,
> + priv->rxtop_skb->len,
> + skb->data,
> + pkt_len);
> + skb_put(priv->rxtop_skb, pkt_len);
> + dev_kfree_skb(skb);
> + } else if (die_dt == DT_FEND) {
> + skb = rgeth_get_skb(ndev, q, entry, desc);
> + skb_copy_to_linear_data_offset(priv->rxtop_skb,
> + priv->rxtop_skb->len,
> + skb->data,
> + pkt_len);
> + skb_put(priv->rxtop_skb, pkt_len);
> + dev_kfree_skb(skb);
> + priv->rxtop_skb->protocol =
> + eth_type_trans(priv->rxtop_skb, ndev);
> + if (ndev->features & NETIF_F_RXCSUM)
> + rgeth_rx_csum(skb);
> + napi_gro_receive(&priv->napi[q],
> + priv->rxtop_skb);
> + stats->rx_packets++;
> + stats->rx_bytes += priv->rxtop_skb->len;
> + }
So why it's necessary to handle the multidecriptor packets?
[...]
> @@ -678,7 +995,10 @@ static bool ravb_rx_ex(struct net_device *ndev, int *quota, int q)
>
> static bool ravb_rx(struct net_device *ndev, int *quota, int q)
> {
> - return ravb_rx_ex(ndev, quota, q);
> + struct ravb_private *priv = netdev_priv(ndev);
> +
> + return (priv->chip_id == RZ_G2L) ?
> + rgeth_rx_ex(ndev, quota, q) : ravb_rx_ex(ndev, quota, q);
Definitely better with the pre-init'ed function pointers if needed at all)...
[...]
> @@ -696,11 +1016,15 @@ static void ravb_rcv_snd_enable(struct net_device *ndev)
> /* function for waiting dma process finished */
> static int ravb_stop_dma(struct net_device *ndev)
> {
> + struct ravb_private *priv = netdev_priv(ndev);
> int error;
>
> /* Wait for stopping the hardware TX process */
> - error = ravb_wait(ndev, TCCR,
> - TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
> + if (priv->chip_id == RZ_G2L)
> + error = ravb_wait(ndev, TCCR, TCCR_TSRQ0, 0);
Only a single TX queue?
> + else
> + error = ravb_wait(ndev, TCCR,
> + TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
This is better expressed thru a mask in the private data...
[...]
> @@ -823,11 +1147,13 @@ static bool ravb_queue_interrupt(struct net_device *ndev, int q)
>
> static bool ravb_timestamp_interrupt(struct net_device *ndev)
> {
> + struct ravb_private *priv = netdev_priv(ndev);
> u32 tis = ravb_read(ndev, TIS);
>
> if (tis & TIS_TFUF) {
> ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
> - ravb_get_tx_tstamp(ndev);
> + if (priv->chip_id != RZ_G2L)
> + ravb_get_tx_tstamp(ndev);
So, no TX pakcet timestaming?..
[...]
> @@ -872,7 +1198,7 @@ static irqreturn_t ravb_interrupt(int irq, void *dev_id)
> }
>
> /* gPTP interrupt status summary */
> - if (iss & ISS_CGIS) {
> + if (priv->chip_id != RZ_G2L && (iss & ISS_CGIS)) {
...and no gPTP IRQ?
> ravb_ptp_interrupt(ndev);
> result = IRQ_HANDLED;
> }
> @@ -947,12 +1273,20 @@ static int ravb_poll(struct napi_struct *napi, int budget)
> int q = napi - priv->napi;
> int mask = BIT(q);
> int quota = budget;
> + int entry;
> + struct ravb_rx_desc *desc;
The lines with the local variables should be sotrted by length, the longer going first
(so caleld reverse Xmas tree)...
[...]
> @@ -1082,15 +1440,23 @@ static int ravb_phy_init(struct net_device *ndev)
> netdev_info(ndev, "limited PHY to 100Mbit/s\n");
> }
>
> - /* 10BASE, Pause and Asym Pause is not supported */
> - phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
> - phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);
> - phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Pause_BIT);
> - phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);
> + if (priv->chip_id == RZ_G2L) {
Why not *switch*?
cxr35> + if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID)
> + ravb_write(ndev, ravb_read(ndev, CXR35) | CXR35_SEL_MODIN, CXR35);
> + else if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII)
> + ravb_write(ndev, 0x3E80000, CXR35);
> + } else {
>
[...]
> @@ -1133,6 +1499,24 @@ static void ravb_set_msglevel(struct net_device *ndev, u32 value)
> priv->msg_enable = value;
> }
>
> +static const char rgeth_gstrings_stats[][ETH_GSTRING_LEN] = {
> + "rx_queue_0_current",
> + "tx_queue_0_current",
> + "rx_queue_0_dirty",
> + "tx_queue_0_dirty",
> + "rx_queue_0_packets",
> + "tx_queue_0_packets",
> + "rx_queue_0_bytes",
> + "tx_queue_0_bytes",
> + "rx_queue_0_mcast_packets",
> + "rx_queue_0_errors",
> + "rx_queue_0_crc_errors",
> + "rx_queue_0_frame_errors",
> + "rx_queue_0_length_errors",
> + "rx_queue_0_csum_offload_errors",
> + "rx_queue_0_over_errors",
> +};
I think we can get out without duplicating the stgring arrays...
[...]
> @@ -1669,6 +2079,20 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
> stats0 = &priv->stats[RAVB_BE];
> stats1 = &priv->stats[RAVB_NC];
>
> + if (priv->chip_id == RZ_G2L) {
> + nstats->tx_dropped += ravb_read(ndev, TROCR);
> + ravb_write(ndev, 0, TROCR); /* (write clear) */
Why duplicated with R-Car gen3?
> + nstats->collisions += ravb_read(ndev, CDCR);
> + ravb_write(ndev, 0, CDCR); /* (write clear) */
> + nstats->tx_carrier_errors += ravb_read(ndev, LCCR);
> + ravb_write(ndev, 0, LCCR); /* (write clear) */
> +
> + nstats->tx_carrier_errors += ravb_read(ndev, CERCR);
> + ravb_write(ndev, 0, CERCR); /* (write clear) */
> + nstats->tx_carrier_errors += ravb_read(ndev, CEECR);
> + ravb_write(ndev, 0, CEECR); /* (write clear) */
> + }
> +
> if (priv->chip_id == RCAR_GEN3) {
Must be else if here...
[...]
> @@ -1899,6 +2325,44 @@ static int ravb_set_features(struct net_device *ndev,
> return 0;
> }
>
> +static int rgeth_set_features(struct net_device *ndev,
> + netdev_features_t features)
> +{
> + int error;
> + unsigned int reg = 0;
> + netdev_features_t changed = features ^ ndev->features;
Reverse Xmas tree, please.
> +
> + reg = ravb_read(ndev, CSR0);
> +
> + ravb_write(ndev, ravb_read(ndev, CSR0) & ~(CSR0_RPE | CSR0_TPE), CSR0);
Why read CSR0 twice?
[...]
> @@ -1930,7 +2408,10 @@ static int ravb_mdio_init(struct ravb_private *priv)
> return -ENOMEM;
>
> /* Hook up MII support for ethtool */
> - priv->mii_bus->name = "ravb_mii";
> + if (priv->chip_id == RZ_G2L)
> + priv->mii_bus->name = "rgeth_mii";
> + else
> + priv->mii_bus->name = "ravb_mii";
Hm... I don't think we need this.
[...]
> @@ -1965,6 +2446,7 @@ static const struct of_device_id ravb_match_table[] = {
> { .compatible = "renesas,etheravb-rcar-gen2", .data = (void *)RCAR_GEN2 },
> { .compatible = "renesas,etheravb-r8a7795", .data = (void *)RCAR_GEN3 },
> { .compatible = "renesas,etheravb-rcar-gen3", .data = (void *)RCAR_GEN3 },
> + { .compatible = "renesas,rzg2l-gether", .data = (void *)RZ_G2L },
Mhm, we reserve the right to call the hardware "gether" to the to the rdriver...
Would the "renesas,rzg2l-gbeth" string fit?
[...]
> @@ -2082,20 +2565,11 @@ static int ravb_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - /* Get base address */
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (!res) {
> - dev_err(&pdev->dev, "invalid resource\n");
> - return -EINVAL;
> - }
> -
> ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
> NUM_TX_QUEUE, NUM_RX_QUEUE);
> if (!ndev)
> return -ENOMEM;
>
> - /* The Ether-specific entries in the device structure. */
> - ndev->base_addr = res->start;
>
> chip_id = (enum ravb_chip_id)of_device_get_match_data(&pdev->dev);
>
> @@ -2104,11 +2578,19 @@ static int ravb_probe(struct platform_device *pdev)
> priv = netdev_priv(ndev);
> priv->chip_id = chip_id;
>
> - ndev->features = NETIF_F_RXCSUM;
> - ndev->hw_features = NETIF_F_RXCSUM;
> -
> - pm_runtime_enable(&pdev->dev);
> - pm_runtime_get_sync(&pdev->dev);
> + if (chip_id == RZ_G2L) {
> + ndev->hw_features |= (NETIF_F_HW_CSUM | NETIF_F_RXCSUM);
> + priv->rstc = devm_reset_control_get(&pdev->dev, NULL);
> + if (IS_ERR(priv->rstc)) {
> + dev_err(&pdev->dev, "failed to get cpg reset\n");
> + free_netdev(ndev);
> + return PTR_ERR(priv->rstc);
> + }
> + reset_control_deassert(priv->rstc);
This asks for the serpate patch.
[...]
> @@ -2120,18 +2602,24 @@ static int ravb_probe(struct platform_device *pdev)
> }
> ndev->irq = irq;
>
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_get_sync(&pdev->dev);
> +
> priv->ndev = ndev;
> priv->pdev = pdev;
> priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
> priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
> priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
> priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
> - priv->addr = devm_ioremap_resource(&pdev->dev, res);
> + priv->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
Separate patch, please.
[...]
> @@ -2181,30 +2671,39 @@ static int ravb_probe(struct platform_device *pdev)
[...]
> /* Set AVB config mode */
> ravb_set_config_mode(ndev);
>
> - /* Set GTI value */
> - error = ravb_set_gti(ndev);
> - if (error)
> - goto out_disable_refclk;
> + if (priv->chip_id != RZ_G2L) {
> + /* Set GTI value */
> + error = ravb_set_gti(ndev);
> + if (error)
> + goto out_disable_refclk;
>
> - /* Request GTI loading */
> - ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> + /* Request GTI loading */
> + ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
>
> - if (priv->chip_id == RCAR_GEN3) {
> - ravb_parse_delay_mode(np, ndev);
> - ravb_set_delay_mode(ndev);
> + if (priv->chip_id == RCAR_GEN3) {
> + ravb_parse_delay_mode(np, ndev);
> + ravb_set_delay_mode(ndev);
> + }
> }
Ugh... needs to be untagled too.
Went thru the large patch at last! If you need help addressing comments,
I can probably make the driver patches using data parametrization vs chip_id.
[...]
MBR, Sergei
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