Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...

[drm/drm-misc.git] / drivers / net / ethernet / meta / fbnic / fbnic_mac.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) Meta Platforms, Inc. and affiliates. */

#include <linux/bitfield.h>
#include <net/tcp.h>

#include "fbnic.h"
#include "fbnic_mac.h"
#include "fbnic_netdev.h"

static void fbnic_init_readrq(struct fbnic_dev *fbd, unsigned int offset,
                              unsigned int cls, unsigned int readrq)
{
        u32 val = rd32(fbd, offset);

        /* The TDF_CTL masks are a superset of the RNI_RBP ones. So we can
         * use them when setting either the TDE_CTF or RNI_RBP registers.
         */
        val &= FBNIC_QM_TNI_TDF_CTL_MAX_OT | FBNIC_QM_TNI_TDF_CTL_MAX_OB;

        val |= FIELD_PREP(FBNIC_QM_TNI_TDF_CTL_MRRS, readrq) |
               FIELD_PREP(FBNIC_QM_TNI_TDF_CTL_CLS, cls);

        wr32(fbd, offset, val);
}

static void fbnic_init_mps(struct fbnic_dev *fbd, unsigned int offset,
                           unsigned int cls, unsigned int mps)
{
        u32 val = rd32(fbd, offset);

        /* Currently all MPS masks are identical so just use the first one */
        val &= ~(FBNIC_QM_TNI_TCM_CTL_MPS | FBNIC_QM_TNI_TCM_CTL_CLS);

        val |= FIELD_PREP(FBNIC_QM_TNI_TCM_CTL_MPS, mps) |
               FIELD_PREP(FBNIC_QM_TNI_TCM_CTL_CLS, cls);

        wr32(fbd, offset, val);
}

static void fbnic_mac_init_axi(struct fbnic_dev *fbd)
{
        bool override_1k = false;
        int readrq, mps, cls;

        /* All of the values are based on being a power of 2 starting
         * with 64 == 0. Therefore we can either divide by 64 in the
         * case of constants, or just subtract 6 from the log2 of the value
         * in order to get the value we will be programming into the
         * registers.
         */
        readrq = ilog2(fbd->readrq) - 6;
        if (readrq > 3)
                override_1k = true;
        readrq = clamp(readrq, 0, 3);

        mps = ilog2(fbd->mps) - 6;
        mps = clamp(mps, 0, 3);

        cls = ilog2(L1_CACHE_BYTES) - 6;
        cls = clamp(cls, 0, 3);

        /* Configure Tx/Rx AXI Paths w/ Read Request and Max Payload sizes */
        fbnic_init_readrq(fbd, FBNIC_QM_TNI_TDF_CTL, cls, readrq);
        fbnic_init_mps(fbd, FBNIC_QM_TNI_TCM_CTL, cls, mps);

        /* Configure QM TNI TDE:
         * - Max outstanding AXI beats to 704(768 - 64) - guaranetees 8% of
         *   buffer capacity to descriptors.
         * - Max outstanding transactions to 128
         */
        wr32(fbd, FBNIC_QM_TNI_TDE_CTL,
             FIELD_PREP(FBNIC_QM_TNI_TDE_CTL_MRRS_1K, override_1k ? 1 : 0) |
             FIELD_PREP(FBNIC_QM_TNI_TDE_CTL_MAX_OB, 704) |
             FIELD_PREP(FBNIC_QM_TNI_TDE_CTL_MAX_OT, 128) |
             FIELD_PREP(FBNIC_QM_TNI_TDE_CTL_MRRS, readrq) |
             FIELD_PREP(FBNIC_QM_TNI_TDE_CTL_CLS, cls));

        fbnic_init_readrq(fbd, FBNIC_QM_RNI_RBP_CTL, cls, readrq);
        fbnic_init_mps(fbd, FBNIC_QM_RNI_RDE_CTL, cls, mps);
        fbnic_init_mps(fbd, FBNIC_QM_RNI_RCM_CTL, cls, mps);

        /* Enable XALI AR/AW outbound */
        wr32(fbd, FBNIC_PUL_OB_TLP_HDR_AW_CFG,
             FBNIC_PUL_OB_TLP_HDR_AW_CFG_BME);
        wr32(fbd, FBNIC_PUL_OB_TLP_HDR_AR_CFG,
             FBNIC_PUL_OB_TLP_HDR_AR_CFG_BME);
}

static void fbnic_mac_init_qm(struct fbnic_dev *fbd)
{
        u32 clock_freq;

        /* Configure TSO behavior */
        wr32(fbd, FBNIC_QM_TQS_CTL0,
             FIELD_PREP(FBNIC_QM_TQS_CTL0_LSO_TS_MASK,
                        FBNIC_QM_TQS_CTL0_LSO_TS_LAST) |
             FIELD_PREP(FBNIC_QM_TQS_CTL0_PREFETCH_THRESH,
                        FBNIC_QM_TQS_CTL0_PREFETCH_THRESH_MIN));

        /* Limit EDT to INT_MAX as this is the limit of the EDT Qdisc */
        wr32(fbd, FBNIC_QM_TQS_EDT_TS_RANGE, INT_MAX);

        /* Configure MTU
         * Due to known HW issue we cannot set the MTU to within 16 octets
         * of a 64 octet aligned boundary. So we will set the TQS_MTU(s) to
         * MTU + 1.
         */
        wr32(fbd, FBNIC_QM_TQS_MTU_CTL0, FBNIC_MAX_JUMBO_FRAME_SIZE + 1);
        wr32(fbd, FBNIC_QM_TQS_MTU_CTL1,
             FIELD_PREP(FBNIC_QM_TQS_MTU_CTL1_BULK,
                        FBNIC_MAX_JUMBO_FRAME_SIZE + 1));

        clock_freq = FBNIC_CLOCK_FREQ;

        /* Be aggressive on the timings. We will have the interrupt
         * threshold timer tick once every 1 usec and coalesce writes for
         * up to 80 usecs.
         */
        wr32(fbd, FBNIC_QM_TCQ_CTL0,
             FIELD_PREP(FBNIC_QM_TCQ_CTL0_TICK_CYCLES,
                        clock_freq / 1000000) |
             FIELD_PREP(FBNIC_QM_TCQ_CTL0_COAL_WAIT,
                        clock_freq / 12500));

        /* We will have the interrupt threshold timer tick once every
         * 1 usec and coalesce writes for up to 2 usecs.
         */
        wr32(fbd, FBNIC_QM_RCQ_CTL0,
             FIELD_PREP(FBNIC_QM_RCQ_CTL0_TICK_CYCLES,
                        clock_freq / 1000000) |
             FIELD_PREP(FBNIC_QM_RCQ_CTL0_COAL_WAIT,
                        clock_freq / 500000));

        /* Configure spacer control to 64 beats. */
        wr32(fbd, FBNIC_FAB_AXI4_AR_SPACER_2_CFG,
             FBNIC_FAB_AXI4_AR_SPACER_MASK |
             FIELD_PREP(FBNIC_FAB_AXI4_AR_SPACER_THREADSHOLD, 2));
}

#define FBNIC_DROP_EN_MASK      0x7d
#define FBNIC_PAUSE_EN_MASK     0x14
#define FBNIC_ECN_EN_MASK       0x10

struct fbnic_fifo_config {
        unsigned int addr;
        unsigned int size;
};

/* Rx FIFO Configuration
 * The table consists of 8 entries, of which only 4 are currently used
 * The starting addr is in units of 64B and the size is in 2KB units
 * Below is the human readable version of the table defined below:
 * Function             Addr    Size
 * ----------------------------------
 * Network to Host/BMC  384K    64K
 * Unused
 * Unused
 * Network to BMC       448K    32K
 * Network to Host      0       384K
 * Unused
 * BMC to Host          480K    32K
 * Unused
 */
static const struct fbnic_fifo_config fifo_config[] = {
        { .addr = 0x1800, .size = 0x20 },       /* Network to Host/BMC */
        { },                                    /* Unused */
        { },                                    /* Unused */
        { .addr = 0x1c00, .size = 0x10 },       /* Network to BMC */
        { .addr = 0x0000, .size = 0xc0 },       /* Network to Host */
        { },                                    /* Unused */
        { .addr = 0x1e00, .size = 0x10 },       /* BMC to Host */
        { }                                     /* Unused */
};

static void fbnic_mac_init_rxb(struct fbnic_dev *fbd)
{
        bool rx_enable;
        int i;

        rx_enable = !!(rd32(fbd, FBNIC_RPC_RMI_CONFIG) &
                       FBNIC_RPC_RMI_CONFIG_ENABLE);

        for (i = 0; i < 8; i++) {
                unsigned int size = fifo_config[i].size;

                /* If we are coming up on a system that already has the
                 * Rx data path enabled we don't need to reconfigure the
                 * FIFOs. Instead we can check to verify the values are
                 * large enough to meet our needs, and use the values to
                 * populate the flow control, ECN, and drop thresholds.
                 */
                if (rx_enable) {
                        size = FIELD_GET(FBNIC_RXB_PBUF_SIZE,
                                         rd32(fbd, FBNIC_RXB_PBUF_CFG(i)));
                        if (size < fifo_config[i].size)
                                dev_warn(fbd->dev,
                                         "fifo%d size of %d smaller than expected value of %d\n",
                                         i, size << 11,
                                         fifo_config[i].size << 11);
                } else {
                        /* Program RXB Cuthrough */
                        wr32(fbd, FBNIC_RXB_CT_SIZE(i),
                             FIELD_PREP(FBNIC_RXB_CT_SIZE_HEADER, 4) |
                             FIELD_PREP(FBNIC_RXB_CT_SIZE_PAYLOAD, 2));

                        /* The granularity for the packet buffer size is 2KB
                         * granularity while the packet buffer base address is
                         * only 64B granularity
                         */
                        wr32(fbd, FBNIC_RXB_PBUF_CFG(i),
                             FIELD_PREP(FBNIC_RXB_PBUF_BASE_ADDR,
                                        fifo_config[i].addr) |
                             FIELD_PREP(FBNIC_RXB_PBUF_SIZE, size));

                        /* The granularity for the credits is 64B. This is
                         * based on RXB_PBUF_SIZE * 32 + 4.
                         */
                        wr32(fbd, FBNIC_RXB_PBUF_CREDIT(i),
                             FIELD_PREP(FBNIC_RXB_PBUF_CREDIT_MASK,
                                        size ? size * 32 + 4 : 0));
                }

                if (!size)
                        continue;

                /* Pause is size of FIFO with 56KB skid to start/stop */
                wr32(fbd, FBNIC_RXB_PAUSE_THLD(i),
                     !(FBNIC_PAUSE_EN_MASK & (1u << i)) ? 0x1fff :
                     FIELD_PREP(FBNIC_RXB_PAUSE_THLD_ON,
                                size * 32 - 0x380) |
                     FIELD_PREP(FBNIC_RXB_PAUSE_THLD_OFF, 0x380));

                /* Enable Drop when only one packet is left in the FIFO */
                wr32(fbd, FBNIC_RXB_DROP_THLD(i),
                     !(FBNIC_DROP_EN_MASK & (1u << i)) ? 0x1fff :
                     FIELD_PREP(FBNIC_RXB_DROP_THLD_ON,
                                size * 32 -
                                FBNIC_MAX_JUMBO_FRAME_SIZE / 64) |
                     FIELD_PREP(FBNIC_RXB_DROP_THLD_OFF,
                                size * 32 -
                                FBNIC_MAX_JUMBO_FRAME_SIZE / 64));

                /* Enable ECN bit when 1/4 of RXB is filled with at least
                 * 1 room for one full jumbo frame before setting ECN
                 */
                wr32(fbd, FBNIC_RXB_ECN_THLD(i),
                     !(FBNIC_ECN_EN_MASK & (1u << i)) ? 0x1fff :
                     FIELD_PREP(FBNIC_RXB_ECN_THLD_ON,
                                max_t(unsigned int,
                                      size * 32 / 4,
                                      FBNIC_MAX_JUMBO_FRAME_SIZE / 64)) |
                     FIELD_PREP(FBNIC_RXB_ECN_THLD_OFF,
                                max_t(unsigned int,
                                      size * 32 / 4,
                                      FBNIC_MAX_JUMBO_FRAME_SIZE / 64)));
        }

        /* For now only enable drop and ECN. We need to add driver/kernel
         * interfaces for configuring pause.
         */
        wr32(fbd, FBNIC_RXB_PAUSE_DROP_CTRL,
             FIELD_PREP(FBNIC_RXB_PAUSE_DROP_CTRL_DROP_ENABLE,
                        FBNIC_DROP_EN_MASK) |
             FIELD_PREP(FBNIC_RXB_PAUSE_DROP_CTRL_ECN_ENABLE,
                        FBNIC_ECN_EN_MASK));

        /* Program INTF credits */
        wr32(fbd, FBNIC_RXB_INTF_CREDIT,
             FBNIC_RXB_INTF_CREDIT_MASK0 |
             FBNIC_RXB_INTF_CREDIT_MASK1 |
             FBNIC_RXB_INTF_CREDIT_MASK2 |
             FIELD_PREP(FBNIC_RXB_INTF_CREDIT_MASK3, 8));

        /* Configure calendar slots.
         * Rx: 0 - 62   RDE 1st, BMC 2nd
         *     63       BMC 1st, RDE 2nd
         */
        for (i = 0; i < 16; i++) {
                u32 calendar_val = (i == 15) ? 0x1e1b1b1b : 0x1b1b1b1b;

                wr32(fbd, FBNIC_RXB_CLDR_PRIO_CFG(i), calendar_val);
        }

        /* Split the credits for the DRR up as follows:
         * Quantum0: 8000       Network to Host
         * Quantum1: 0          Not used
         * Quantum2: 80         BMC to Host
         * Quantum3: 0          Not used
         * Quantum4: 8000       Multicast to Host and BMC
         */
        wr32(fbd, FBNIC_RXB_DWRR_RDE_WEIGHT0,
             FIELD_PREP(FBNIC_RXB_DWRR_RDE_WEIGHT0_QUANTUM0, 0x40) |
             FIELD_PREP(FBNIC_RXB_DWRR_RDE_WEIGHT0_QUANTUM2, 0x50));
        wr32(fbd, FBNIC_RXB_DWRR_RDE_WEIGHT0_EXT,
             FIELD_PREP(FBNIC_RXB_DWRR_RDE_WEIGHT0_QUANTUM0, 0x1f));
        wr32(fbd, FBNIC_RXB_DWRR_RDE_WEIGHT1,
             FIELD_PREP(FBNIC_RXB_DWRR_RDE_WEIGHT1_QUANTUM4, 0x40));
        wr32(fbd, FBNIC_RXB_DWRR_RDE_WEIGHT1_EXT,
             FIELD_PREP(FBNIC_RXB_DWRR_RDE_WEIGHT1_QUANTUM4, 0x1f));

        /* Program RXB FCS Endian register */
        wr32(fbd, FBNIC_RXB_ENDIAN_FCS, 0x0aaaaaa0);
}

static void fbnic_mac_init_txb(struct fbnic_dev *fbd)
{
        int i;

        wr32(fbd, FBNIC_TCE_TXB_CTRL, 0);

        /* Configure Tx QM Credits */
        wr32(fbd, FBNIC_QM_TQS_CTL1,
             FIELD_PREP(FBNIC_QM_TQS_CTL1_MC_MAX_CREDITS, 0x40) |
             FIELD_PREP(FBNIC_QM_TQS_CTL1_BULK_MAX_CREDITS, 0x20));

        /* Initialize internal Tx queues */
        wr32(fbd, FBNIC_TCE_TXB_TEI_Q0_CTRL, 0);
        wr32(fbd, FBNIC_TCE_TXB_TEI_Q1_CTRL, 0);
        wr32(fbd, FBNIC_TCE_TXB_MC_Q_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_SIZE, 0x400) |
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_START, 0x000));
        wr32(fbd, FBNIC_TCE_TXB_RX_TEI_Q_CTRL, 0);
        wr32(fbd, FBNIC_TCE_TXB_TX_BMC_Q_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_SIZE, 0x200) |
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_START, 0x400));
        wr32(fbd, FBNIC_TCE_TXB_RX_BMC_Q_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_SIZE, 0x200) |
             FIELD_PREP(FBNIC_TCE_TXB_Q_CTRL_START, 0x600));

        wr32(fbd, FBNIC_TCE_LSO_CTRL,
             FBNIC_TCE_LSO_CTRL_IPID_MODE_INC |
             FIELD_PREP(FBNIC_TCE_LSO_CTRL_TCPF_CLR_1ST, TCPHDR_PSH |
                                                         TCPHDR_FIN) |
             FIELD_PREP(FBNIC_TCE_LSO_CTRL_TCPF_CLR_MID, TCPHDR_PSH |
                                                         TCPHDR_CWR |
                                                         TCPHDR_FIN) |
             FIELD_PREP(FBNIC_TCE_LSO_CTRL_TCPF_CLR_END, TCPHDR_CWR));
        wr32(fbd, FBNIC_TCE_CSO_CTRL, 0);

        wr32(fbd, FBNIC_TCE_BMC_MAX_PKTSZ,
             FIELD_PREP(FBNIC_TCE_BMC_MAX_PKTSZ_TX,
                        FBNIC_MAX_JUMBO_FRAME_SIZE) |
             FIELD_PREP(FBNIC_TCE_BMC_MAX_PKTSZ_RX,
                        FBNIC_MAX_JUMBO_FRAME_SIZE));
        wr32(fbd, FBNIC_TCE_MC_MAX_PKTSZ,
             FIELD_PREP(FBNIC_TCE_MC_MAX_PKTSZ_TMI,
                        FBNIC_MAX_JUMBO_FRAME_SIZE));

        /* Configure calendar slots.
         * Tx: 0 - 62   TMI 1st, BMC 2nd
         *     63       BMC 1st, TMI 2nd
         */
        for (i = 0; i < 16; i++) {
                u32 calendar_val = (i == 15) ? 0x1e1b1b1b : 0x1b1b1b1b;

                wr32(fbd, FBNIC_TCE_TXB_CLDR_SLOT_CFG(i), calendar_val);
        }

        /* Configure DWRR */
        wr32(fbd, FBNIC_TCE_TXB_ENQ_WRR_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_ENQ_WRR_CTRL_WEIGHT0, 0x64) |
             FIELD_PREP(FBNIC_TCE_TXB_ENQ_WRR_CTRL_WEIGHT2, 0x04));
        wr32(fbd, FBNIC_TCE_TXB_TEI_DWRR_CTRL, 0);
        wr32(fbd, FBNIC_TCE_TXB_TEI_DWRR_CTRL_EXT, 0);
        wr32(fbd, FBNIC_TCE_TXB_BMC_DWRR_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_BMC_DWRR_CTRL_QUANTUM0, 0x50) |
             FIELD_PREP(FBNIC_TCE_TXB_BMC_DWRR_CTRL_QUANTUM1, 0x82));
        wr32(fbd, FBNIC_TCE_TXB_BMC_DWRR_CTRL_EXT, 0);
        wr32(fbd, FBNIC_TCE_TXB_NTWRK_DWRR_CTRL,
             FIELD_PREP(FBNIC_TCE_TXB_NTWRK_DWRR_CTRL_QUANTUM1, 0x50) |
             FIELD_PREP(FBNIC_TCE_TXB_NTWRK_DWRR_CTRL_QUANTUM2, 0x20));
        wr32(fbd, FBNIC_TCE_TXB_NTWRK_DWRR_CTRL_EXT,
             FIELD_PREP(FBNIC_TCE_TXB_NTWRK_DWRR_CTRL_QUANTUM2, 0x03));

        /* Configure SOP protocol protection */
        wr32(fbd, FBNIC_TCE_SOP_PROT_CTRL,
             FIELD_PREP(FBNIC_TCE_SOP_PROT_CTRL_TBI, 0x78) |
             FIELD_PREP(FBNIC_TCE_SOP_PROT_CTRL_TTI_FRM, 0x40) |
             FIELD_PREP(FBNIC_TCE_SOP_PROT_CTRL_TTI_CM, 0x0c));

        /* Conservative configuration on MAC interface Start of Packet
         * protection FIFO. This sets the minimum depth of the FIFO before
         * we start sending packets to the MAC measured in 64B units and
         * up to 160 entries deep.
         *
         * For the ASIC the clock is fast enough that we will likely fill
         * the SOP FIFO before the MAC can drain it. So just use a minimum
         * value of 8.
         */
        wr32(fbd, FBNIC_TMI_SOP_PROT_CTRL, 8);

        wrfl(fbd);
        wr32(fbd, FBNIC_TCE_TXB_CTRL, FBNIC_TCE_TXB_CTRL_TCAM_ENABLE |
                                      FBNIC_TCE_TXB_CTRL_LOAD);
}

static void fbnic_mac_init_regs(struct fbnic_dev *fbd)
{
        fbnic_mac_init_axi(fbd);
        fbnic_mac_init_qm(fbd);
        fbnic_mac_init_rxb(fbd);
        fbnic_mac_init_txb(fbd);
}

static void __fbnic_mac_stat_rd64(struct fbnic_dev *fbd, bool reset, u32 reg,
                                  struct fbnic_stat_counter *stat)
{
        u64 new_reg_value;

        new_reg_value = fbnic_stat_rd64(fbd, reg, 1);
        if (!reset)
                stat->value += new_reg_value - stat->u.old_reg_value_64;
        stat->u.old_reg_value_64 = new_reg_value;
        stat->reported = true;
}

#define fbnic_mac_stat_rd64(fbd, reset, __stat, __CSR) \
        __fbnic_mac_stat_rd64(fbd, reset, FBNIC_##__CSR##_L, &(__stat))

static void fbnic_mac_tx_pause_config(struct fbnic_dev *fbd, bool tx_pause)
{
        u32 rxb_pause_ctrl;

        /* Enable generation of pause frames if enabled */
        rxb_pause_ctrl = rd32(fbd, FBNIC_RXB_PAUSE_DROP_CTRL);
        rxb_pause_ctrl &= ~FBNIC_RXB_PAUSE_DROP_CTRL_PAUSE_ENABLE;
        if (tx_pause)
                rxb_pause_ctrl |=
                        FIELD_PREP(FBNIC_RXB_PAUSE_DROP_CTRL_PAUSE_ENABLE,
                                   FBNIC_PAUSE_EN_MASK);
        wr32(fbd, FBNIC_RXB_PAUSE_DROP_CTRL, rxb_pause_ctrl);
}

static int fbnic_pcs_get_link_event_asic(struct fbnic_dev *fbd)
{
        u32 pcs_intr_mask = rd32(fbd, FBNIC_SIG_PCS_INTR_STS);

        if (pcs_intr_mask & FBNIC_SIG_PCS_INTR_LINK_DOWN)
                return FBNIC_LINK_EVENT_DOWN;

        return (pcs_intr_mask & FBNIC_SIG_PCS_INTR_LINK_UP) ?
               FBNIC_LINK_EVENT_UP : FBNIC_LINK_EVENT_NONE;
}

static u32 __fbnic_mac_cmd_config_asic(struct fbnic_dev *fbd,
                                       bool tx_pause, bool rx_pause)
{
        /* Enable MAC Promiscuous mode and Tx padding */
        u32 command_config = FBNIC_MAC_COMMAND_CONFIG_TX_PAD_EN |
                             FBNIC_MAC_COMMAND_CONFIG_PROMISC_EN;
        struct fbnic_net *fbn = netdev_priv(fbd->netdev);

        /* Disable pause frames if not enabled */
        if (!tx_pause)
                command_config |= FBNIC_MAC_COMMAND_CONFIG_TX_PAUSE_DIS;
        if (!rx_pause)
                command_config |= FBNIC_MAC_COMMAND_CONFIG_RX_PAUSE_DIS;

        /* Disable fault handling if no FEC is requested */
        if ((fbn->fec & FBNIC_FEC_MODE_MASK) == FBNIC_FEC_OFF)
                command_config |= FBNIC_MAC_COMMAND_CONFIG_FLT_HDL_DIS;

        return command_config;
}

static bool fbnic_mac_get_pcs_link_status(struct fbnic_dev *fbd)
{
        struct fbnic_net *fbn = netdev_priv(fbd->netdev);
        u32 pcs_status, lane_mask = ~0;

        pcs_status = rd32(fbd, FBNIC_SIG_PCS_OUT0);
        if (!(pcs_status & FBNIC_SIG_PCS_OUT0_LINK))
                return false;

        /* Define the expected lane mask for the status bits we need to check */
        switch (fbn->link_mode & FBNIC_LINK_MODE_MASK) {
        case FBNIC_LINK_100R2:
                lane_mask = 0xf;
                break;
        case FBNIC_LINK_50R1:
                lane_mask = 3;
                break;
        case FBNIC_LINK_50R2:
                switch (fbn->fec & FBNIC_FEC_MODE_MASK) {
                case FBNIC_FEC_OFF:
                        lane_mask = 0x63;
                        break;
                case FBNIC_FEC_RS:
                        lane_mask = 5;
                        break;
                case FBNIC_FEC_BASER:
                        lane_mask = 0xf;
                        break;
                }
                break;
        case FBNIC_LINK_25R1:
                lane_mask = 1;
                break;
        }

        /* Use an XOR to remove the bits we expect to see set */
        switch (fbn->fec & FBNIC_FEC_MODE_MASK) {
        case FBNIC_FEC_OFF:
                lane_mask ^= FIELD_GET(FBNIC_SIG_PCS_OUT0_BLOCK_LOCK,
                                       pcs_status);
                break;
        case FBNIC_FEC_RS:
                lane_mask ^= FIELD_GET(FBNIC_SIG_PCS_OUT0_AMPS_LOCK,
                                       pcs_status);
                break;
        case FBNIC_FEC_BASER:
                lane_mask ^= FIELD_GET(FBNIC_SIG_PCS_OUT1_FCFEC_LOCK,
                                       rd32(fbd, FBNIC_SIG_PCS_OUT1));
                break;
        }

        /* If all lanes cancelled then we have a lock on all lanes */
        return !lane_mask;
}

static bool fbnic_pcs_get_link_asic(struct fbnic_dev *fbd)
{
        bool link;

        /* Flush status bits to clear possible stale data,
         * bits should reset themselves back to 1 if link is truly up
         */
        wr32(fbd, FBNIC_SIG_PCS_OUT0, FBNIC_SIG_PCS_OUT0_LINK |
                                      FBNIC_SIG_PCS_OUT0_BLOCK_LOCK |
                                      FBNIC_SIG_PCS_OUT0_AMPS_LOCK);
        wr32(fbd, FBNIC_SIG_PCS_OUT1, FBNIC_SIG_PCS_OUT1_FCFEC_LOCK);
        wrfl(fbd);

        /* Clear interrupt state due to recent changes. */
        wr32(fbd, FBNIC_SIG_PCS_INTR_STS,
             FBNIC_SIG_PCS_INTR_LINK_DOWN | FBNIC_SIG_PCS_INTR_LINK_UP);

        link = fbnic_mac_get_pcs_link_status(fbd);

        /* Enable interrupt to only capture changes in link state */
        wr32(fbd, FBNIC_SIG_PCS_INTR_MASK,
             ~FBNIC_SIG_PCS_INTR_LINK_DOWN & ~FBNIC_SIG_PCS_INTR_LINK_UP);
        wr32(fbd, FBNIC_INTR_MASK_CLEAR(0), 1u << FBNIC_PCS_MSIX_ENTRY);

        return link;
}

static void fbnic_pcs_get_fw_settings(struct fbnic_dev *fbd)
{
        struct fbnic_net *fbn = netdev_priv(fbd->netdev);
        u8 link_mode = fbn->link_mode;
        u8 fec = fbn->fec;

        /* Update FEC first to reflect FW current mode */
        if (fbn->fec & FBNIC_FEC_AUTO) {
                switch (fbd->fw_cap.link_fec) {
                case FBNIC_FW_LINK_FEC_NONE:
                        fec = FBNIC_FEC_OFF;
                        break;
                case FBNIC_FW_LINK_FEC_RS:
                        fec = FBNIC_FEC_RS;
                        break;
                case FBNIC_FW_LINK_FEC_BASER:
                        fec = FBNIC_FEC_BASER;
                        break;
                default:
                        return;
                }

                fbn->fec = fec;
        }

        /* Do nothing if AUTO mode is not engaged */
        if (fbn->link_mode & FBNIC_LINK_AUTO) {
                switch (fbd->fw_cap.link_speed) {
                case FBNIC_FW_LINK_SPEED_25R1:
                        link_mode = FBNIC_LINK_25R1;
                        break;
                case FBNIC_FW_LINK_SPEED_50R2:
                        link_mode = FBNIC_LINK_50R2;
                        break;
                case FBNIC_FW_LINK_SPEED_50R1:
                        link_mode = FBNIC_LINK_50R1;
                        fec = FBNIC_FEC_RS;
                        break;
                case FBNIC_FW_LINK_SPEED_100R2:
                        link_mode = FBNIC_LINK_100R2;
                        fec = FBNIC_FEC_RS;
                        break;
                default:
                        return;
                }

                fbn->link_mode = link_mode;
        }
}

static int fbnic_pcs_enable_asic(struct fbnic_dev *fbd)
{
        /* Mask and clear the PCS interrupt, will be enabled by link handler */
        wr32(fbd, FBNIC_SIG_PCS_INTR_MASK, ~0);
        wr32(fbd, FBNIC_SIG_PCS_INTR_STS, ~0);

        /* Pull in settings from FW */
        fbnic_pcs_get_fw_settings(fbd);

        return 0;
}

static void fbnic_pcs_disable_asic(struct fbnic_dev *fbd)
{
        /* Mask and clear the PCS interrupt */
        wr32(fbd, FBNIC_SIG_PCS_INTR_MASK, ~0);
        wr32(fbd, FBNIC_SIG_PCS_INTR_STS, ~0);
}

static void fbnic_mac_link_down_asic(struct fbnic_dev *fbd)
{
        u32 cmd_cfg, mac_ctrl;

        cmd_cfg = __fbnic_mac_cmd_config_asic(fbd, false, false);
        mac_ctrl = rd32(fbd, FBNIC_SIG_MAC_IN0);

        mac_ctrl |= FBNIC_SIG_MAC_IN0_RESET_FF_TX_CLK |
                    FBNIC_SIG_MAC_IN0_RESET_TX_CLK |
                    FBNIC_SIG_MAC_IN0_RESET_FF_RX_CLK |
                    FBNIC_SIG_MAC_IN0_RESET_RX_CLK;

        wr32(fbd, FBNIC_SIG_MAC_IN0, mac_ctrl);
        wr32(fbd, FBNIC_MAC_COMMAND_CONFIG, cmd_cfg);
}

static void fbnic_mac_link_up_asic(struct fbnic_dev *fbd,
                                   bool tx_pause, bool rx_pause)
{
        u32 cmd_cfg, mac_ctrl;

        fbnic_mac_tx_pause_config(fbd, tx_pause);

        cmd_cfg = __fbnic_mac_cmd_config_asic(fbd, tx_pause, rx_pause);
        mac_ctrl = rd32(fbd, FBNIC_SIG_MAC_IN0);

        mac_ctrl &= ~(FBNIC_SIG_MAC_IN0_RESET_FF_TX_CLK |
                      FBNIC_SIG_MAC_IN0_RESET_TX_CLK |
                      FBNIC_SIG_MAC_IN0_RESET_FF_RX_CLK |
                      FBNIC_SIG_MAC_IN0_RESET_RX_CLK);
        cmd_cfg |= FBNIC_MAC_COMMAND_CONFIG_RX_ENA |
                   FBNIC_MAC_COMMAND_CONFIG_TX_ENA;

        wr32(fbd, FBNIC_SIG_MAC_IN0, mac_ctrl);
        wr32(fbd, FBNIC_MAC_COMMAND_CONFIG, cmd_cfg);
}

static void
fbnic_mac_get_eth_mac_stats(struct fbnic_dev *fbd, bool reset,
                            struct fbnic_eth_mac_stats *mac_stats)
{
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->OctetsReceivedOK,
                            MAC_STAT_RX_BYTE_COUNT);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->AlignmentErrors,
                            MAC_STAT_RX_ALIGN_ERROR);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->FrameTooLongErrors,
                            MAC_STAT_RX_TOOLONG);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->FramesReceivedOK,
                            MAC_STAT_RX_RECEIVED_OK);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->FrameCheckSequenceErrors,
                            MAC_STAT_RX_PACKET_BAD_FCS);
        fbnic_mac_stat_rd64(fbd, reset,
                            mac_stats->FramesLostDueToIntMACRcvError,
                            MAC_STAT_RX_IFINERRORS);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->MulticastFramesReceivedOK,
                            MAC_STAT_RX_MULTICAST);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->BroadcastFramesReceivedOK,
                            MAC_STAT_RX_BROADCAST);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->OctetsTransmittedOK,
                            MAC_STAT_TX_BYTE_COUNT);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->FramesTransmittedOK,
                            MAC_STAT_TX_TRANSMITTED_OK);
        fbnic_mac_stat_rd64(fbd, reset,
                            mac_stats->FramesLostDueToIntMACXmitError,
                            MAC_STAT_TX_IFOUTERRORS);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->MulticastFramesXmittedOK,
                            MAC_STAT_TX_MULTICAST);
        fbnic_mac_stat_rd64(fbd, reset, mac_stats->BroadcastFramesXmittedOK,
                            MAC_STAT_TX_BROADCAST);
}

static int fbnic_mac_get_sensor_asic(struct fbnic_dev *fbd, int id, long *val)
{
        struct fbnic_fw_completion fw_cmpl;
        s32 *sensor;

        switch (id) {
        case FBNIC_SENSOR_TEMP:
                sensor = &fw_cmpl.tsene.millidegrees;
                break;
        case FBNIC_SENSOR_VOLTAGE:
                sensor = &fw_cmpl.tsene.millivolts;
                break;
        default:
                return -EINVAL;
        }

        *val = *sensor;

        return 0;
}

static const struct fbnic_mac fbnic_mac_asic = {
        .init_regs = fbnic_mac_init_regs,
        .pcs_enable = fbnic_pcs_enable_asic,
        .pcs_disable = fbnic_pcs_disable_asic,
        .pcs_get_link = fbnic_pcs_get_link_asic,
        .pcs_get_link_event = fbnic_pcs_get_link_event_asic,
        .get_eth_mac_stats = fbnic_mac_get_eth_mac_stats,
        .link_down = fbnic_mac_link_down_asic,
        .link_up = fbnic_mac_link_up_asic,
        .get_sensor = fbnic_mac_get_sensor_asic,
};

/**
 * fbnic_mac_init - Assign a MAC type and initialize the fbnic device
 * @fbd: Device pointer to device to initialize
 *
 * Return: zero on success, negative on failure
 *
 * Initialize the MAC function pointers and initializes the MAC of
 * the device.
 **/
int fbnic_mac_init(struct fbnic_dev *fbd)
{
        fbd->mac = &fbnic_mac_asic;

        fbd->mac->init_regs(fbd);

        return 0;
}