498 lines
14 KiB
C
498 lines
14 KiB
C
/*
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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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* $FreeBSD$
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*
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* netmap support for: lem
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*
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* For details on netmap support please see ixgbe_netmap.h
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*/
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#include <net/netmap.h>
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#include <sys/selinfo.h>
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#include <vm/vm.h>
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#include <vm/pmap.h> /* vtophys ? */
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#include <dev/netmap/netmap_kern.h>
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extern int netmap_adaptive_io;
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/*
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* Register/unregister. We are already under netmap lock.
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*/
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static int
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lem_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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EM_CORE_LOCK(adapter);
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lem_disable_intr(adapter);
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/* Tell the stack that the interface is no longer active */
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ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
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#ifndef EM_LEGACY_IRQ // XXX do we need this ?
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taskqueue_block(adapter->tq);
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taskqueue_drain(adapter->tq, &adapter->rxtx_task);
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taskqueue_drain(adapter->tq, &adapter->link_task);
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#endif /* !EM_LEGCY_IRQ */
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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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lem_init_locked(adapter); /* also enable intr */
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#ifndef EM_LEGACY_IRQ
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taskqueue_unblock(adapter->tq); // XXX do we need this ?
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#endif /* !EM_LEGCY_IRQ */
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EM_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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static int
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lem_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 const lim = kring->nkr_num_slots - 1;
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u_int const head = kring->rhead;
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/* generate an interrupt approximately every half ring */
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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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#ifdef NIC_PARAVIRT
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struct paravirt_csb *csb = adapter->csb;
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uint64_t *csbd = (uint64_t *)(csb + 1);
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#endif /* NIC_PARAVIRT */
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bus_dmamap_sync(adapter->txdma.dma_tag, adapter->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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*/
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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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#ifdef NIC_PARAVIRT
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int do_kick = 0;
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uint64_t t = 0; // timestamp
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int n = head - nm_i;
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if (n < 0)
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n += lim + 1;
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if (csb) {
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t = rdtsc(); /* last timestamp */
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csbd[16] += t - csbd[0]; /* total Wg */
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csbd[17] += n; /* Wg count */
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csbd[0] = t;
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}
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#endif /* NIC_PARAVIRT */
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nic_i = netmap_idx_k2n(kring, nm_i);
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while (nm_i != head) {
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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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struct e1000_tx_desc *curr = &adapter->tx_desc_base[nic_i];
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struct em_buffer *txbuf = &adapter->tx_buffer_area[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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E1000_TXD_CMD_RS : 0;
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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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curr->buffer_addr = htole64(paddr);
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netmap_reload_map(na, adapter->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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curr->upper.data = 0;
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curr->lower.data = htole32(adapter->txd_cmd | len |
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(E1000_TXD_CMD_EOP | flags) );
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bus_dmamap_sync(adapter->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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// XXX might try an early kick
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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(adapter->txdma.dma_tag, adapter->txdma.dma_map,
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BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
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#ifdef NIC_PARAVIRT
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/* set unconditionally, then also kick if needed */
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if (csb) {
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t = rdtsc();
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if (csb->host_need_txkick == 2) {
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/* can compute an update of delta */
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int64_t delta = t - csbd[3];
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if (delta < 0)
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delta = -delta;
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if (csbd[8] == 0 || delta < csbd[8]) {
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csbd[8] = delta;
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csbd[9]++;
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}
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csbd[10]++;
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}
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csb->guest_tdt = nic_i;
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csbd[18] += t - csbd[0]; // total wp
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csbd[19] += n;
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}
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if (!csb || !csb->guest_csb_on || (csb->host_need_txkick & 1))
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do_kick = 1;
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if (do_kick)
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#endif /* NIC_PARAVIRT */
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/* (re)start the tx unit up to slot nic_i (excluded) */
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E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), nic_i);
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#ifdef NIC_PARAVIRT
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if (do_kick) {
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uint64_t t1 = rdtsc();
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csbd[20] += t1 - t; // total Np
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csbd[21]++;
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}
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#endif /* NIC_PARAVIRT */
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}
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/*
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* Second part: reclaim buffers for completed transmissions.
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*/
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if (ticks != kring->last_reclaim || flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
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kring->last_reclaim = ticks;
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/* record completed transmissions using TDH */
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#ifdef NIC_PARAVIRT
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/* host updates tdh unconditionally, and we have
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* no side effects on reads, so we can read from there
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* instead of exiting.
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*/
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if (csb) {
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static int drain = 0, nodrain=0, good = 0, bad = 0, fail = 0;
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u_int x = adapter->next_tx_to_clean;
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csbd[19]++; // XXX count reclaims
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nic_i = csb->host_tdh;
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if (csb->guest_csb_on) {
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if (nic_i == x) {
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bad++;
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csbd[24]++; // failed reclaims
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/* no progress, request kick and retry */
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csb->guest_need_txkick = 1;
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mb(); // XXX barrier
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nic_i = csb->host_tdh;
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} else {
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good++;
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}
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if (nic_i != x) {
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csb->guest_need_txkick = 2;
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if (nic_i == csb->guest_tdt)
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drain++;
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else
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nodrain++;
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#if 1
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if (netmap_adaptive_io) {
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/* new mechanism: last half ring (or so)
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* released one slot at a time.
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* This effectively makes the system spin.
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*
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* Take next_to_clean + 1 as a reference.
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* tdh must be ahead or equal
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* On entry, the logical order is
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* x < tdh = nic_i
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* We first push tdh up to avoid wraps.
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* The limit is tdh-ll (half ring).
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* if tdh-256 < x we report x;
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* else we report tdh-256
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*/
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u_int tdh = nic_i;
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u_int ll = csbd[15];
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u_int delta = lim/8;
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if (netmap_adaptive_io == 2 || ll > delta)
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csbd[15] = ll = delta;
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else if (netmap_adaptive_io == 1 && ll > 1) {
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csbd[15]--;
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}
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if (nic_i >= kring->nkr_num_slots) {
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RD(5, "bad nic_i %d on input", nic_i);
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}
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x = nm_next(x, lim);
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if (tdh < x)
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tdh += lim + 1;
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if (tdh <= x + ll) {
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nic_i = x;
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csbd[25]++; //report n + 1;
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} else {
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tdh = nic_i;
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if (tdh < ll)
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tdh += lim + 1;
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nic_i = tdh - ll;
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csbd[26]++; // report tdh - ll
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}
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}
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#endif
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} else {
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/* we stop, count whether we are idle or not */
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int bh_active = csb->host_need_txkick & 2 ? 4 : 0;
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csbd[27+ csb->host_need_txkick]++;
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if (netmap_adaptive_io == 1) {
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if (bh_active && csbd[15] > 1)
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csbd[15]--;
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else if (!bh_active && csbd[15] < lim/2)
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csbd[15]++;
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}
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bad--;
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fail++;
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}
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}
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RD(1, "drain %d nodrain %d good %d retry %d fail %d",
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drain, nodrain, good, bad, fail);
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} else
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#endif /* !NIC_PARAVIRT */
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nic_i = E1000_READ_REG(&adapter->hw, E1000_TDH(0));
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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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adapter->next_tx_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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nm_txsync_finalize(kring);
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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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*/
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static int
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lem_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 = nm_rxsync_prologue(kring);
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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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#ifdef NIC_PARAVIRT
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struct paravirt_csb *csb = adapter->csb;
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uint32_t csb_mode = csb && csb->guest_csb_on;
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uint32_t do_host_rxkick = 0;
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#endif /* NIC_PARAVIRT */
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if (head > lim)
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return netmap_ring_reinit(kring);
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#ifdef NIC_PARAVIRT
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if (csb_mode) {
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force_update = 1;
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csb->guest_need_rxkick = 0;
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}
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#endif /* NIC_PARAVIRT */
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/* XXX check sync modes */
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bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->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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if (netmap_no_pendintr || force_update) {
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uint16_t slot_flags = kring->nkr_slot_flags;
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nic_i = adapter->next_rx_desc_to_check;
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nm_i = netmap_idx_n2k(kring, nic_i);
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for (n = 0; ; n++) {
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struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i];
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uint32_t staterr = le32toh(curr->status);
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int len;
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#ifdef NIC_PARAVIRT
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if (csb_mode) {
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if ((staterr & E1000_RXD_STAT_DD) == 0) {
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/* don't bother to retry if more than 1 pkt */
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if (n > 1)
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break;
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csb->guest_need_rxkick = 1;
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wmb();
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staterr = le32toh(curr->status);
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if ((staterr & E1000_RXD_STAT_DD) == 0) {
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break;
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} else { /* we are good */
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csb->guest_need_rxkick = 0;
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}
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}
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} else
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#endif /* NIC_PARAVIRT */
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if ((staterr & E1000_RXD_STAT_DD) == 0)
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break;
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len = le16toh(curr->length) - 4; // CRC
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if (len < 0) {
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RD(5, "bogus pkt (%d) size %d nic idx %d", n, len, nic_i);
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len = 0;
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}
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ring->slot[nm_i].len = len;
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ring->slot[nm_i].flags = slot_flags;
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bus_dmamap_sync(adapter->rxtag,
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adapter->rx_buffer_area[nic_i].map,
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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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#ifdef NIC_PARAVIRT
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if (csb_mode) {
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if (n > 1) {
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/* leave one spare buffer so we avoid rxkicks */
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nm_i = nm_prev(nm_i, lim);
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nic_i = nm_prev(nic_i, lim);
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n--;
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} else {
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csb->guest_need_rxkick = 1;
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}
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}
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#endif /* NIC_PARAVIRT */
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ND("%d new packets at nic %d nm %d tail %d",
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n,
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adapter->next_rx_desc_to_check,
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netmap_idx_n2k(kring, adapter->next_rx_desc_to_check),
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kring->nr_hwtail);
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adapter->next_rx_desc_to_check = nic_i;
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// if_inc_counter(ifp, IFCOUNTER_IPACKETS, n);
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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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*/
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nm_i = kring->nr_hwcur;
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if (nm_i != head) {
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nic_i = netmap_idx_k2n(kring, nm_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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uint64_t paddr;
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void *addr = PNMB(na, slot, &paddr);
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struct e1000_rx_desc *curr = &adapter->rx_desc_base[nic_i];
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struct em_buffer *rxbuf = &adapter->rx_buffer_area[nic_i];
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if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
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goto ring_reset;
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if (slot->flags & NS_BUF_CHANGED) {
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/* buffer has changed, reload map */
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curr->buffer_addr = htole64(paddr);
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netmap_reload_map(na, adapter->rxtag, rxbuf->map, addr);
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slot->flags &= ~NS_BUF_CHANGED;
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}
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curr->status = 0;
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bus_dmamap_sync(adapter->rxtag, rxbuf->map,
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BUS_DMASYNC_PREREAD);
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#ifdef NIC_PARAVIRT
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if (csb_mode && csb->host_rxkick_at == nic_i)
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do_host_rxkick = 1;
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#endif /* NIC_PARAVIRT */
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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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bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map,
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BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
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/*
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* IMPORTANT: we must leave one free slot in the ring,
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* so move nic_i back by one unit
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*/
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nic_i = nm_prev(nic_i, lim);
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#ifdef NIC_PARAVIRT
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/* set unconditionally, then also kick if needed */
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if (csb)
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csb->guest_rdt = nic_i;
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if (!csb_mode || do_host_rxkick)
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#endif /* NIC_PARAVIRT */
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E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), nic_i);
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}
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/* tell userspace that there might be new packets */
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nm_rxsync_finalize(kring);
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return 0;
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ring_reset:
|
|
return netmap_ring_reinit(kring);
|
|
}
|
|
|
|
|
|
static void
|
|
lem_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 = lem_netmap_txsync;
|
|
na.nm_rxsync = lem_netmap_rxsync;
|
|
na.nm_register = lem_netmap_reg;
|
|
na.num_tx_rings = na.num_rx_rings = 1;
|
|
netmap_attach(&na);
|
|
}
|
|
|
|
/* end of file */
|