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Message-ID: <b60e6487-095f-d4bb-cd6b-ea38bec6c5d6@amd.com>
Date: Wed, 13 Dec 2023 21:55:42 +0530
From: Raju Rangoju <Raju.Rangoju@....com>
To: Tom Lendacky <thomas.lendacky@....com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, Shyam-sundar.S-k@....com,
 Sudheesh Mavila <sudheesh.mavila@....com>
Subject: Re: [PATCH v3 net-next 2/3] amd-xgbe: add support for Crater ethernet
 device



On 12/12/2023 9:02 PM, Tom Lendacky wrote:
> On 12/11/23 23:37, Raju Rangoju wrote:
>> Add the necessary support to enable Crater ethernet device. Since the
>> BAR1 address cannot be used to access the XPCS registers on Crater, use
>> the pci_{read/write}_config_dword calls. Also, include the new pci device
>> id 0x1641 to register Crater device with PCIe.
>>
>> Co-developed-by: Sudheesh Mavila <sudheesh.mavila@....com>
>> Signed-off-by: Sudheesh Mavila <sudheesh.mavila@....com>
>> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
>> ---
>>   drivers/net/ethernet/amd/xgbe/xgbe-common.h |  5 ++
>>   drivers/net/ethernet/amd/xgbe/xgbe-dev.c    | 93 +++++++++++++++++++++
>>   drivers/net/ethernet/amd/xgbe/xgbe-pci.c    | 35 +++++++-
>>   drivers/net/ethernet/amd/xgbe/xgbe.h        |  6 ++
>>   4 files changed, 137 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-common.h 
>> b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
>> index 3b70f6737633..e1f70f0528ef 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe-common.h
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
>> @@ -900,6 +900,11 @@
>>   #define PCS_V2_RV_WINDOW_SELECT        0x1064
>>   #define PCS_V2_YC_WINDOW_DEF        0x18060
>>   #define PCS_V2_YC_WINDOW_SELECT        0x18064
>> +#define PCS_V2_RN_WINDOW_DEF        0xF8078
>> +#define PCS_V2_RN_WINDOW_SELECT        0xF807c
> 
> Should this be PCS_V3_ (here and below) ??

Yes, it should be PCS_V3. I'll take care of it in next version.

> 
>> +
>> +#define PCS_RN_SMN_BASE_ADDR        0x11E00000
>> +#define PCS_RN_PORT_ADDR_SIZE        0x100000
> 
> All hex characters should be consistent and in lower case.

Sure

> 
>>   /* PCS register entry bit positions and sizes */
>>   #define PCS_V2_WINDOW_DEF_OFFSET_INDEX    6
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c 
>> b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
>> index 6cd003c24a64..a9eb2ffa9f73 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
>> @@ -120,6 +120,7 @@
>>   #include <linux/bitrev.h>
>>   #include <linux/crc32.h>
>>   #include <linux/crc32poly.h>
>> +#include <linux/pci.h>
>>   #include "xgbe.h"
>>   #include "xgbe-common.h"
>> @@ -1165,6 +1166,92 @@ static unsigned int get_index_offset(struct 
>> xgbe_prv_data *pdata, unsigned int m
>>       return pdata->xpcs_window + (mmd_address & 
>> pdata->xpcs_window_mask);
>>   }
>> +static int xgbe_read_mmd_regs_v3(struct xgbe_prv_data *pdata, int prtad,
>> +                 int mmd_reg)
>> +{
>> +    unsigned int mmd_address, index, offset;
>> +    struct pci_dev *rdev;
>> +    unsigned long flags;
>> +    int mmd_data;
>> +
>> +    rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
>> +    if (!rdev)
>> +        return 0;
>> +
>> +    mmd_address = get_mmd_address(pdata, mmd_reg);
>> +
>> +    /* The PCS registers are accessed using mmio. The underlying
>> +     * management interface uses indirect addressing to access the MMD
>> +     * register sets. This requires accessing of the PCS register in two
>> +     * phases, an address phase and a data phase.
>> +     *
>> +     * The mmio interface is based on 16-bit offsets and values. All
>> +     * register offsets must therefore be adjusted by left shifting the
>> +     * offset 1 bit and reading 16 bits of data.
>> +     */
>> +    offset = get_index_offset(pdata, mmd_address, &index);
>> +
>> +    spin_lock_irqsave(&pdata->xpcs_lock, flags);
>> +    pci_write_config_dword(rdev, 0x60, (pdata->xphy_base + 
>> pdata->xpcs_window_sel_reg));
>> +    pci_write_config_dword(rdev, 0x64, index);
>> +    pci_write_config_dword(rdev, 0x60, pdata->xphy_base + offset);
>> +    pci_read_config_dword(rdev, 0x64, &mmd_data);
>> +    mmd_data = (offset % 4) ? FIELD_GET(XGBE_GEN_HI_MASK, mmd_data) :
>> +                  FIELD_GET(XGBE_GEN_LO_MASK, mmd_data);
>> +    pci_dev_put(rdev);
>> +
>> +    spin_unlock_irqrestore(&pdata->xpcs_lock, flags);
>> +
>> +    return mmd_data;
>> +}
>> +
>> +static void xgbe_write_mmd_regs_v3(struct xgbe_prv_data *pdata, int 
>> prtad,
>> +                   int mmd_reg, int mmd_data)
>> +{
>> +    unsigned int mmd_address, index, offset, ctr_mmd_data;
>> +    struct pci_dev *rdev;
>> +    unsigned long flags;
>> +
>> +    rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
>> +    if (!rdev)
>> +        return;
>> +
>> +    mmd_address = get_mmd_address(pdata, mmd_reg);
>> +
>> +    /* The PCS registers are accessed using mmio. The underlying
>> +     * management interface uses indirect addressing to access the MMD
>> +     * register sets. This requires accessing of the PCS register in two
>> +     * phases, an address phase and a data phase.
>> +     *
>> +     * The mmio interface is based on 16-bit offsets and values. All
>> +     * register offsets must therefore be adjusted by left shifting the
>> +     * offset 1 bit and writing 16 bits of data.
>> +     */
>> +    offset = get_index_offset(pdata, mmd_address, &index);
>> +
>> +    spin_lock_irqsave(&pdata->xpcs_lock, flags);
>> +    pci_write_config_dword(rdev, 0x60, (pdata->xphy_base + 
>> pdata->xpcs_window_sel_reg));
>> +    pci_write_config_dword(rdev, 0x64, index);
>> +    pci_write_config_dword(rdev, 0x60, pdata->xphy_base + offset);
>> +    pci_read_config_dword(rdev, 0x64, &ctr_mmd_data);
>> +    if (offset % 4) {
>> +        ctr_mmd_data = FIELD_PREP(XGBE_GEN_HI_MASK, mmd_data) |
>> +                   FIELD_GET(XGBE_GEN_LO_MASK, ctr_mmd_data);
>> +    } else {
>> +        ctr_mmd_data = FIELD_PREP(XGBE_GEN_HI_MASK,
>> +                      FIELD_GET(XGBE_GEN_HI_MASK, ctr_mmd_data)) |
>> +                   FIELD_GET(XGBE_GEN_LO_MASK, mmd_data);
>> +    }
> 
> Braces aren't necessary.
> 
> Also, just curious, what is the "ctr" prefix meant to imply here?

ctr = crater. Will use the full name instead to avoid confusion.

> 
> 
>> +
>> +    pci_write_config_dword(rdev, 0x60, (pdata->xphy_base + 
>> pdata->xpcs_window_sel_reg));
>> +    pci_write_config_dword(rdev, 0x64, index);
>> +    pci_write_config_dword(rdev, 0x60, (pdata->xphy_base + offset));
>> +    pci_write_config_dword(rdev, 0x64, ctr_mmd_data);
>> +    pci_dev_put(rdev);
>> +
>> +    spin_unlock_irqrestore(&pdata->xpcs_lock, flags);
>> +}
>> +
>>   static int xgbe_read_mmd_regs_v2(struct xgbe_prv_data *pdata, int 
>> prtad,
>>                    int mmd_reg)
>>   {
>> @@ -1274,6 +1361,9 @@ static int xgbe_read_mmd_regs(struct 
>> xgbe_prv_data *pdata, int prtad,
>>       case XGBE_XPCS_ACCESS_V1:
>>           return xgbe_read_mmd_regs_v1(pdata, prtad, mmd_reg);
>> +    case XGBE_XPCS_ACCESS_V3:
>> +        return xgbe_read_mmd_regs_v3(pdata, prtad, mmd_reg);
>> +
>>       case XGBE_XPCS_ACCESS_V2:
>>       default:
>>           return xgbe_read_mmd_regs_v2(pdata, prtad, mmd_reg);
>> @@ -1287,6 +1377,9 @@ static void xgbe_write_mmd_regs(struct 
>> xgbe_prv_data *pdata, int prtad,
>>       case XGBE_XPCS_ACCESS_V1:
>>           return xgbe_write_mmd_regs_v1(pdata, prtad, mmd_reg, mmd_data);
>> +    case XGBE_XPCS_ACCESS_V3:
>> +        return xgbe_write_mmd_regs_v3(pdata, prtad, mmd_reg, mmd_data);
>> +
>>       case XGBE_XPCS_ACCESS_V2:
>>       default:
>>           return xgbe_write_mmd_regs_v2(pdata, prtad, mmd_reg, mmd_data);
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c 
>> b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
>> index 8b0c1e450b7e..db3e8aac3339 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
>> @@ -295,15 +295,28 @@ static int xgbe_pci_probe(struct pci_dev *pdev, 
>> const struct pci_device_id *id)
>>           /* Yellow Carp devices do not need rrc */
>>           pdata->vdata->enable_rrc = 0;
>>           break;
>> +    case 0x1630:
> 
> What PCI ID is this, it doesn't match the 0x1641 added below?

0x1630 is root hub

> 
> Thanks,
> Tom
> 
>> +        pdata->xpcs_window_def_reg = PCS_V2_RN_WINDOW_DEF;
>> +        pdata->xpcs_window_sel_reg = PCS_V2_RN_WINDOW_SELECT;
>> +        break;
>>       default:
>>           pdata->xpcs_window_def_reg = PCS_V2_WINDOW_DEF;
>>           pdata->xpcs_window_sel_reg = PCS_V2_WINDOW_SELECT;
>>           break;
>>       }
>> -    pci_dev_put(rdev);
>>       /* Configure the PCS indirect addressing support */
>> -    reg = XPCS32_IOREAD(pdata, pdata->xpcs_window_def_reg);
>> +    if (pdata->vdata->xpcs_access == XGBE_XPCS_ACCESS_V3) {
>> +        reg = XP_IOREAD(pdata, XP_PROP_0);
>> +        pdata->xphy_base = PCS_RN_SMN_BASE_ADDR +
>> +                   (PCS_RN_PORT_ADDR_SIZE * XP_GET_BITS(reg, 
>> XP_PROP_0, PORT_ID));
>> +        pci_write_config_dword(rdev, 0x60, pdata->xphy_base + 
>> (pdata->xpcs_window_def_reg));
>> +        pci_read_config_dword(rdev, 0x64, &reg);
>> +    } else {
>> +        reg = XPCS32_IOREAD(pdata, pdata->xpcs_window_def_reg);
>> +    }
>> +    pci_dev_put(rdev);
>> +
>>       pdata->xpcs_window = XPCS_GET_BITS(reg, PCS_V2_WINDOW_DEF, OFFSET);
>>       pdata->xpcs_window <<= 6;
>>       pdata->xpcs_window_size = XPCS_GET_BITS(reg, PCS_V2_WINDOW_DEF, 
>> SIZE);
>> @@ -481,6 +494,22 @@ static int __maybe_unused xgbe_pci_resume(struct 
>> device *dev)
>>       return ret;
>>   }
>> +static struct xgbe_version_data xgbe_v3 = {
>> +    .init_function_ptrs_phy_impl    = xgbe_init_function_ptrs_phy_v2,
>> +    .xpcs_access            = XGBE_XPCS_ACCESS_V3,
>> +    .mmc_64bit            = 1,
>> +    .tx_max_fifo_size        = 65536,
>> +    .rx_max_fifo_size        = 65536,
>> +    .tx_tstamp_workaround        = 1,
>> +    .ecc_support            = 1,
>> +    .i2c_support            = 1,
>> +    .irq_reissue_support        = 1,
>> +    .tx_desc_prefetch        = 5,
>> +    .rx_desc_prefetch        = 5,
>> +    .an_cdr_workaround        = 0,
>> +    .enable_rrc            = 0,
>> +};
>> +
>>   static struct xgbe_version_data xgbe_v2a = {
>>       .init_function_ptrs_phy_impl    = xgbe_init_function_ptrs_phy_v2,
>>       .xpcs_access            = XGBE_XPCS_ACCESS_V2,
>> @@ -518,6 +547,8 @@ static const struct pci_device_id xgbe_pci_table[] 
>> = {
>>         .driver_data = (kernel_ulong_t)&xgbe_v2a },
>>       { PCI_VDEVICE(AMD, 0x1459),
>>         .driver_data = (kernel_ulong_t)&xgbe_v2b },
>> +    { PCI_VDEVICE(AMD, 0x1641),
>> +      .driver_data = (kernel_ulong_t)&xgbe_v3 },
>>       /* Last entry must be zero */
>>       { 0, }
>>   };
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h 
>> b/drivers/net/ethernet/amd/xgbe/xgbe.h
>> index ad136ed493ed..dbb1faaf6185 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe.h
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
>> @@ -347,6 +347,10 @@
>>               (_src)->link_modes._sname,        \
>>               __ETHTOOL_LINK_MODE_MASK_NBITS)
>> +/* Generic low and high masks */
>> +#define XGBE_GEN_HI_MASK    GENMASK(31, 16)
>> +#define XGBE_GEN_LO_MASK    GENMASK(15, 0)
>> +
>>   struct xgbe_prv_data;
>>   struct xgbe_packet_data {
>> @@ -565,6 +569,7 @@ enum xgbe_speed {
>>   enum xgbe_xpcs_access {
>>       XGBE_XPCS_ACCESS_V1 = 0,
>>       XGBE_XPCS_ACCESS_V2,
>> +    XGBE_XPCS_ACCESS_V3,
>>   };
>>   enum xgbe_an_mode {
>> @@ -1056,6 +1061,7 @@ struct xgbe_prv_data {
>>       struct device *dev;
>>       struct platform_device *phy_platdev;
>>       struct device *phy_dev;
>> +    unsigned int xphy_base;
>>       /* Version related data */
>>       struct xgbe_version_data *vdata;

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