522 lines
17 KiB
C
522 lines
17 KiB
C
/******************************************************************************
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Copyright (c) 2001-2017, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************/
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/*$FreeBSD: head/sys/dev/ixgbe/ixgbe_netmap.c 320688 2017-07-05 17:27:03Z erj $*/
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/*
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* Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD: head/sys/dev/ixgbe/ixgbe_netmap.c 320688 2017-07-05 17:27:03Z erj $
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*
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* netmap support for: ixgbe
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*
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* This file is meant to be a reference on how to implement
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* netmap support for a network driver.
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* This file contains code but only static or inline functions used
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* by a single driver. To avoid replication of code we just #include
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* it near the beginning of the standard driver.
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*/
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#ifdef DEV_NETMAP
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/*
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* Some drivers may need the following headers. Others
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* already include them by default
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#include <vm/vm.h>
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#include <vm/pmap.h>
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*/
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#include "ixgbe.h"
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/*
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* device-specific sysctl variables:
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*
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* ix_crcstrip: 0: keep CRC in rx frames (default), 1: strip it.
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* During regular operations the CRC is stripped, but on some
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* hardware reception of frames not multiple of 64 is slower,
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* so using crcstrip=0 helps in benchmarks.
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*
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* ix_rx_miss, ix_rx_miss_bufs:
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* count packets that might be missed due to lost interrupts.
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*/
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SYSCTL_DECL(_dev_netmap);
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static int ix_rx_miss, ix_rx_miss_bufs;
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int ix_crcstrip;
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SYSCTL_INT(_dev_netmap, OID_AUTO, ix_crcstrip,
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CTLFLAG_RW, &ix_crcstrip, 0, "strip CRC on rx frames");
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SYSCTL_INT(_dev_netmap, OID_AUTO, ix_rx_miss,
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CTLFLAG_RW, &ix_rx_miss, 0, "potentially missed rx intr");
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SYSCTL_INT(_dev_netmap, OID_AUTO, ix_rx_miss_bufs,
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CTLFLAG_RW, &ix_rx_miss_bufs, 0, "potentially missed rx intr bufs");
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static void
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set_crcstrip(struct ixgbe_hw *hw, int onoff)
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{
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/* crc stripping is set in two places:
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* IXGBE_HLREG0 (modified on init_locked and hw reset)
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* IXGBE_RDRXCTL (set by the original driver in
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* ixgbe_setup_hw_rsc() called in init_locked.
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* We disable the setting when netmap is compiled in).
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* We update the values here, but also in ixgbe.c because
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* init_locked sometimes is called outside our control.
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*/
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uint32_t hl, rxc;
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hl = IXGBE_READ_REG(hw, IXGBE_HLREG0);
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rxc = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
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if (netmap_verbose)
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D("%s read HLREG 0x%x rxc 0x%x",
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onoff ? "enter" : "exit", hl, rxc);
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/* hw requirements ... */
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rxc &= ~IXGBE_RDRXCTL_RSCFRSTSIZE;
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rxc |= IXGBE_RDRXCTL_RSCACKC;
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if (onoff && !ix_crcstrip) {
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/* keep the crc. Fast rx */
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hl &= ~IXGBE_HLREG0_RXCRCSTRP;
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rxc &= ~IXGBE_RDRXCTL_CRCSTRIP;
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} else {
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/* reset default mode */
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hl |= IXGBE_HLREG0_RXCRCSTRP;
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rxc |= IXGBE_RDRXCTL_CRCSTRIP;
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}
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if (netmap_verbose)
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D("%s write HLREG 0x%x rxc 0x%x",
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onoff ? "enter" : "exit", hl, rxc);
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IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hl);
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IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rxc);
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}
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/*
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* Register/unregister. We are already under netmap lock.
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* Only called on the first register or the last unregister.
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*/
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static int
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ixgbe_netmap_reg(struct netmap_adapter *na, int onoff)
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{
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struct ifnet *ifp = na->ifp;
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struct adapter *adapter = ifp->if_softc;
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IXGBE_CORE_LOCK(adapter);
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adapter->stop_locked(adapter);
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set_crcstrip(&adapter->hw, onoff);
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/* enable or disable flags and callbacks in na and ifp */
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if (onoff) {
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nm_set_native_flags(na);
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} else {
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nm_clear_native_flags(na);
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}
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adapter->init_locked(adapter); /* also enables intr */
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set_crcstrip(&adapter->hw, onoff); // XXX why twice ?
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IXGBE_CORE_UNLOCK(adapter);
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return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
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}
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/*
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* Reconcile kernel and user view of the transmit ring.
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*
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* All information is in the kring.
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* Userspace wants to send packets up to the one before kring->rhead,
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* kernel knows kring->nr_hwcur is the first unsent packet.
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*
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* Here we push packets out (as many as possible), and possibly
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* reclaim buffers from previously completed transmission.
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*
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* The caller (netmap) guarantees that there is only one instance
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* running at any time. Any interference with other driver
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* methods should be handled by the individual drivers.
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*/
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static int
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ixgbe_netmap_txsync(struct netmap_kring *kring, int flags)
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{
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struct netmap_adapter *na = kring->na;
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struct ifnet *ifp = na->ifp;
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struct netmap_ring *ring = kring->ring;
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u_int nm_i; /* index into the netmap ring */
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u_int nic_i; /* index into the NIC ring */
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u_int n;
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u_int const lim = kring->nkr_num_slots - 1;
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u_int const head = kring->rhead;
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/*
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* interrupts on every tx packet are expensive so request
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* them every half ring, or where NS_REPORT is set
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*/
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u_int report_frequency = kring->nkr_num_slots >> 1;
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/* device-specific */
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struct adapter *adapter = ifp->if_softc;
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struct tx_ring *txr = &adapter->tx_rings[kring->ring_id];
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int reclaim_tx;
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bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
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BUS_DMASYNC_POSTREAD);
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/*
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* First part: process new packets to send.
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* nm_i is the current index in the netmap ring,
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* nic_i is the corresponding index in the NIC ring.
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* The two numbers differ because upon a *_init() we reset
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* the NIC ring but leave the netmap ring unchanged.
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* For the transmit ring, we have
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*
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* nm_i = kring->nr_hwcur
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* nic_i = IXGBE_TDT (not tracked in the driver)
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* and
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* nm_i == (nic_i + kring->nkr_hwofs) % ring_size
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*
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* In this driver kring->nkr_hwofs >= 0, but for other
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* drivers it might be negative as well.
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*/
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/*
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* If we have packets to send (kring->nr_hwcur != kring->rhead)
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* iterate over the netmap ring, fetch length and update
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* the corresponding slot in the NIC ring. Some drivers also
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* need to update the buffer's physical address in the NIC slot
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* even NS_BUF_CHANGED is not set (PNMB computes the addresses).
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*
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* The netmap_reload_map() calls is especially expensive,
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* even when (as in this case) the tag is 0, so do only
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* when the buffer has actually changed.
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*
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* If possible do not set the report/intr bit on all slots,
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* but only a few times per ring or when NS_REPORT is set.
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*
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* Finally, on 10G and faster drivers, it might be useful
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* to prefetch the next slot and txr entry.
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*/
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nm_i = kring->nr_hwcur;
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if (nm_i != head) { /* we have new packets to send */
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nic_i = netmap_idx_k2n(kring, nm_i);
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__builtin_prefetch(&ring->slot[nm_i]);
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__builtin_prefetch(&txr->tx_buffers[nic_i]);
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for (n = 0; nm_i != head; n++) {
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struct netmap_slot *slot = &ring->slot[nm_i];
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u_int len = slot->len;
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uint64_t paddr;
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void *addr = PNMB(na, slot, &paddr);
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/* device-specific */
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union ixgbe_adv_tx_desc *curr = &txr->tx_base[nic_i];
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struct ixgbe_tx_buf *txbuf = &txr->tx_buffers[nic_i];
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int flags = (slot->flags & NS_REPORT ||
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nic_i == 0 || nic_i == report_frequency) ?
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IXGBE_TXD_CMD_RS : 0;
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/* prefetch for next round */
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__builtin_prefetch(&ring->slot[nm_i + 1]);
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__builtin_prefetch(&txr->tx_buffers[nic_i + 1]);
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NM_CHECK_ADDR_LEN(na, addr, len);
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if (slot->flags & NS_BUF_CHANGED) {
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/* buffer has changed, reload map */
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netmap_reload_map(na, txr->txtag, txbuf->map, addr);
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}
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slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
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/* Fill the slot in the NIC ring. */
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/* Use legacy descriptor, they are faster? */
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curr->read.buffer_addr = htole64(paddr);
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curr->read.olinfo_status = 0;
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curr->read.cmd_type_len = htole32(len | flags |
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IXGBE_ADVTXD_DCMD_IFCS | IXGBE_TXD_CMD_EOP);
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/* make sure changes to the buffer are synced */
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bus_dmamap_sync(txr->txtag, txbuf->map,
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BUS_DMASYNC_PREWRITE);
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nm_i = nm_next(nm_i, lim);
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nic_i = nm_next(nic_i, lim);
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}
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kring->nr_hwcur = head;
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/* synchronize the NIC ring */
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bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
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BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
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/* (re)start the tx unit up to slot nic_i (excluded) */
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IXGBE_WRITE_REG(&adapter->hw, txr->tail, nic_i);
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}
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/*
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* Second part: reclaim buffers for completed transmissions.
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* Because this is expensive (we read a NIC register etc.)
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* we only do it in specific cases (see below).
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*/
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if (flags & NAF_FORCE_RECLAIM) {
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reclaim_tx = 1; /* forced reclaim */
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} else if (!nm_kr_txempty(kring)) {
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reclaim_tx = 0; /* have buffers, no reclaim */
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} else {
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/*
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* No buffers available. Locate previous slot with
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* REPORT_STATUS set.
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* If the slot has DD set, we can reclaim space,
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* otherwise wait for the next interrupt.
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* This enables interrupt moderation on the tx
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* side though it might reduce throughput.
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*/
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struct ixgbe_legacy_tx_desc *txd =
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(struct ixgbe_legacy_tx_desc *)txr->tx_base;
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nic_i = txr->next_to_clean + report_frequency;
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if (nic_i > lim)
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nic_i -= lim + 1;
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// round to the closest with dd set
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nic_i = (nic_i < kring->nkr_num_slots / 4 ||
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nic_i >= kring->nkr_num_slots*3/4) ?
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0 : report_frequency;
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reclaim_tx = txd[nic_i].upper.fields.status & IXGBE_TXD_STAT_DD; // XXX cpu_to_le32 ?
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}
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if (reclaim_tx) {
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/*
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* Record completed transmissions.
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* We (re)use the driver's txr->next_to_clean to keep
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* track of the most recently completed transmission.
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*
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* The datasheet discourages the use of TDH to find
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* out the number of sent packets, but we only set
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* REPORT_STATUS in a few slots so TDH is the only
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* good way.
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*/
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nic_i = IXGBE_READ_REG(&adapter->hw, IXGBE_TDH(kring->ring_id));
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if (nic_i >= kring->nkr_num_slots) { /* XXX can it happen ? */
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D("TDH wrap %d", nic_i);
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nic_i -= kring->nkr_num_slots;
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}
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if (nic_i != txr->next_to_clean) {
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/* some tx completed, increment avail */
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txr->next_to_clean = nic_i;
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kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
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}
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}
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return 0;
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}
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/*
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* Reconcile kernel and user view of the receive ring.
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* Same as for the txsync, this routine must be efficient.
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* The caller guarantees a single invocations, but races against
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* the rest of the driver should be handled here.
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*
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* On call, kring->rhead is the first packet that userspace wants
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* to keep, and kring->rcur is the wakeup point.
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* The kernel has previously reported packets up to kring->rtail.
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*
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* If (flags & NAF_FORCE_READ) also check for incoming packets irrespective
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* of whether or not we received an interrupt.
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*/
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static int
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ixgbe_netmap_rxsync(struct netmap_kring *kring, int flags)
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{
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struct netmap_adapter *na = kring->na;
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struct ifnet *ifp = na->ifp;
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struct netmap_ring *ring = kring->ring;
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u_int nm_i; /* index into the netmap ring */
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u_int nic_i; /* index into the NIC ring */
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u_int n;
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u_int const lim = kring->nkr_num_slots - 1;
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u_int const head = kring->rhead;
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int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
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/* device-specific */
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struct adapter *adapter = ifp->if_softc;
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struct rx_ring *rxr = &adapter->rx_rings[kring->ring_id];
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if (head > lim)
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return netmap_ring_reinit(kring);
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/* XXX check sync modes */
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bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
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BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
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/*
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* First part: import newly received packets.
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*
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* nm_i is the index of the next free slot in the netmap ring,
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* nic_i is the index of the next received packet in the NIC ring,
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* and they may differ in case if_init() has been called while
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* in netmap mode. For the receive ring we have
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*
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* nic_i = rxr->next_to_check;
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* nm_i = kring->nr_hwtail (previous)
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* and
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* nm_i == (nic_i + kring->nkr_hwofs) % ring_size
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*
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* rxr->next_to_check is set to 0 on a ring reinit
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*/
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if (netmap_no_pendintr || force_update) {
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int crclen = (ix_crcstrip) ? 0 : 4;
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uint16_t slot_flags = kring->nkr_slot_flags;
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nic_i = rxr->next_to_check; // or also k2n(kring->nr_hwtail)
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nm_i = netmap_idx_n2k(kring, nic_i);
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for (n = 0; ; n++) {
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union ixgbe_adv_rx_desc *curr = &rxr->rx_base[nic_i];
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uint32_t staterr = le32toh(curr->wb.upper.status_error);
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if ((staterr & IXGBE_RXD_STAT_DD) == 0)
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break;
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ring->slot[nm_i].len = le16toh(curr->wb.upper.length) - crclen;
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ring->slot[nm_i].flags = slot_flags;
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bus_dmamap_sync(rxr->ptag,
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rxr->rx_buffers[nic_i].pmap, BUS_DMASYNC_POSTREAD);
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nm_i = nm_next(nm_i, lim);
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nic_i = nm_next(nic_i, lim);
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}
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if (n) { /* update the state variables */
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if (netmap_no_pendintr && !force_update) {
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/* diagnostics */
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ix_rx_miss ++;
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ix_rx_miss_bufs += n;
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}
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rxr->next_to_check = nic_i;
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kring->nr_hwtail = nm_i;
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}
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kring->nr_kflags &= ~NKR_PENDINTR;
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}
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/*
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* Second part: skip past packets that userspace has released.
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* (kring->nr_hwcur to kring->rhead excluded),
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* and make the buffers available for reception.
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* As usual nm_i is the index in the netmap ring,
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* nic_i is the index in the NIC ring, and
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* nm_i == (nic_i + kring->nkr_hwofs) % ring_size
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*/
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nm_i = kring->nr_hwcur;
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if (nm_i != head) {
|
|
nic_i = netmap_idx_k2n(kring, nm_i);
|
|
for (n = 0; nm_i != head; n++) {
|
|
struct netmap_slot *slot = &ring->slot[nm_i];
|
|
uint64_t paddr;
|
|
void *addr = PNMB(na, slot, &paddr);
|
|
|
|
union ixgbe_adv_rx_desc *curr = &rxr->rx_base[nic_i];
|
|
struct ixgbe_rx_buf *rxbuf = &rxr->rx_buffers[nic_i];
|
|
|
|
if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
|
|
goto ring_reset;
|
|
|
|
if (slot->flags & NS_BUF_CHANGED) {
|
|
/* buffer has changed, reload map */
|
|
netmap_reload_map(na, rxr->ptag, rxbuf->pmap, addr);
|
|
slot->flags &= ~NS_BUF_CHANGED;
|
|
}
|
|
curr->wb.upper.status_error = 0;
|
|
curr->read.pkt_addr = htole64(paddr);
|
|
bus_dmamap_sync(rxr->ptag, rxbuf->pmap,
|
|
BUS_DMASYNC_PREREAD);
|
|
nm_i = nm_next(nm_i, lim);
|
|
nic_i = nm_next(nic_i, lim);
|
|
}
|
|
kring->nr_hwcur = head;
|
|
|
|
bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
|
|
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
|
|
/*
|
|
* IMPORTANT: we must leave one free slot in the ring,
|
|
* so move nic_i back by one unit
|
|
*/
|
|
nic_i = nm_prev(nic_i, lim);
|
|
IXGBE_WRITE_REG(&adapter->hw, rxr->tail, nic_i);
|
|
}
|
|
|
|
return 0;
|
|
|
|
ring_reset:
|
|
return netmap_ring_reinit(kring);
|
|
}
|
|
|
|
|
|
/*
|
|
* The attach routine, called near the end of ixgbe_attach(),
|
|
* fills the parameters for netmap_attach() and calls it.
|
|
* It cannot fail, in the worst case (such as no memory)
|
|
* netmap mode will be disabled and the driver will only
|
|
* operate in standard mode.
|
|
*/
|
|
void
|
|
ixgbe_netmap_attach(struct adapter *adapter)
|
|
{
|
|
struct netmap_adapter na;
|
|
|
|
bzero(&na, sizeof(na));
|
|
|
|
na.ifp = adapter->ifp;
|
|
na.na_flags = NAF_BDG_MAYSLEEP;
|
|
na.num_tx_desc = adapter->num_tx_desc;
|
|
na.num_rx_desc = adapter->num_rx_desc;
|
|
na.nm_txsync = ixgbe_netmap_txsync;
|
|
na.nm_rxsync = ixgbe_netmap_rxsync;
|
|
na.nm_register = ixgbe_netmap_reg;
|
|
na.num_tx_rings = na.num_rx_rings = adapter->num_queues;
|
|
netmap_attach(&na);
|
|
}
|
|
|
|
#endif /* DEV_NETMAP */
|
|
|
|
/* end of file */
|