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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, ®);
>> + } 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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