FreeBSD/Linux Kernel Cross Reference
sys/dev/sfxge/common/medford_nic.c

     /*-
      * Copyright (c) 2015-2016 Solarflare Communications Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are met:
      *
      * 1. Redistributions of source code must retain the above copyright notice,
      *    this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright notice,
     *    this list of conditions and the following disclaimer in the documentation
     *    and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
     * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * The views and conclusions contained in the software and documentation are
     * those of the authors and should not be interpreted as representing official
     * policies, either expressed or implied, of the FreeBSD Project.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "efx.h"
    #include "efx_impl.h"
    
    #if EFSYS_OPT_MEDFORD
    
    static  __checkReturn   efx_rc_t
    medford_nic_get_required_pcie_bandwidth(
            __in            efx_nic_t *enp,
            __out           uint32_t *bandwidth_mbpsp)
    {
            uint32_t bandwidth;
            efx_rc_t rc;
    
            if ((rc = ef10_nic_get_port_mode_bandwidth(enp,
                                                        &bandwidth)) != 0)
                    goto fail1;
    
            *bandwidth_mbpsp = bandwidth;
    
            return (0);
    
    fail1:
            EFSYS_PROBE1(fail1, efx_rc_t, rc);
    
            return (rc);
    }
    
            __checkReturn   efx_rc_t
    medford_board_cfg(
            __in            efx_nic_t *enp)
    {
            efx_nic_cfg_t *encp = &(enp->en_nic_cfg);
            uint32_t sysclk, dpcpu_clk;
            uint32_t end_padding;
            uint32_t bandwidth;
            efx_rc_t rc;
    
            /*
             * Enable firmware workarounds for hardware errata.
             * Expected responses are:
             *  - 0 (zero):
             *      Success: workaround enabled or disabled as requested.
             *  - MC_CMD_ERR_ENOSYS (reported as ENOTSUP):
             *      Firmware does not support the MC_CMD_WORKAROUND request.
             *      (assume that the workaround is not supported).
             *  - MC_CMD_ERR_ENOENT (reported as ENOENT):
             *      Firmware does not support the requested workaround.
             *  - MC_CMD_ERR_EPERM  (reported as EACCES):
             *      Unprivileged function cannot enable/disable workarounds.
             *
             * See efx_mcdi_request_errcode() for MCDI error translations.
             */
    
            if (EFX_PCI_FUNCTION_IS_VF(encp)) {
                    /*
                     * Interrupt testing does not work for VFs. See bug50084 and
                     * bug71432 comment 21.
                     */
                    encp->enc_bug41750_workaround = B_TRUE;
            }
    
            /* Chained multicast is always enabled on Medford */
            encp->enc_bug26807_workaround = B_TRUE;
    
            /*
             * If the bug61265 workaround is enabled, then interrupt holdoff timers
            * cannot be controlled by timer table writes, so MCDI must be used
            * (timer table writes can still be used for wakeup timers).
            */
           rc = efx_mcdi_set_workaround(enp, MC_CMD_WORKAROUND_BUG61265, B_TRUE,
               NULL);
           if ((rc == 0) || (rc == EACCES))
                   encp->enc_bug61265_workaround = B_TRUE;
           else if ((rc == ENOTSUP) || (rc == ENOENT))
                   encp->enc_bug61265_workaround = B_FALSE;
           else
                   goto fail1;
   
           /* Checksums for TSO sends can be incorrect on Medford. */
           encp->enc_bug61297_workaround = B_TRUE;
   
           /* Get clock frequencies (in MHz). */
           if ((rc = efx_mcdi_get_clock(enp, &sysclk, &dpcpu_clk)) != 0)
                   goto fail2;
   
           /*
            * The Medford timer quantum is 1536 dpcpu_clk cycles, documented for
            * the EV_TMR_VAL field of EV_TIMER_TBL. Scale for MHz and ns units.
            */
           encp->enc_evq_timer_quantum_ns = 1536000UL / dpcpu_clk; /* 1536 cycles */
           encp->enc_evq_timer_max_us = (encp->enc_evq_timer_quantum_ns <<
                       FRF_CZ_TC_TIMER_VAL_WIDTH) / 1000;
   
           /* Alignment for receive packet DMA buffers */
           encp->enc_rx_buf_align_start = 1;
   
           /* Get the RX DMA end padding alignment configuration */
           if ((rc = efx_mcdi_get_rxdp_config(enp, &end_padding)) != 0) {
                   if (rc != EACCES)
                           goto fail3;
   
                   /* Assume largest tail padding size supported by hardware */
                   end_padding = 256;
           }
           encp->enc_rx_buf_align_end = end_padding;
   
           /*
            * The maximum supported transmit queue size is 2048. TXQs with 4096
            * descriptors are not supported as the top bit is used for vfifo
            * stuffing.
            */
           encp->enc_txq_max_ndescs = 2048;
   
           EFX_STATIC_ASSERT(MEDFORD_PIOBUF_NBUFS <= EF10_MAX_PIOBUF_NBUFS);
           encp->enc_piobuf_limit = MEDFORD_PIOBUF_NBUFS;
           encp->enc_piobuf_size = MEDFORD_PIOBUF_SIZE;
           encp->enc_piobuf_min_alloc_size = MEDFORD_MIN_PIO_ALLOC_SIZE;
   
           /*
            * Medford stores a single global copy of VPD, not per-PF as on
            * Huntington.
            */
           encp->enc_vpd_is_global = B_TRUE;
   
           rc = medford_nic_get_required_pcie_bandwidth(enp, &bandwidth);
           if (rc != 0)
                   goto fail4;
           encp->enc_required_pcie_bandwidth_mbps = bandwidth;
           encp->enc_max_pcie_link_gen = EFX_PCIE_LINK_SPEED_GEN3;
   
           return (0);
   
   fail4:
           EFSYS_PROBE(fail4);
   fail3:
           EFSYS_PROBE(fail3);
   fail2:
           EFSYS_PROBE(fail2);
   fail1:
           EFSYS_PROBE1(fail1, efx_rc_t, rc);
   
           return (rc);
   }
   
   #endif  /* EFSYS_OPT_MEDFORD */

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