mirror of
https://github.com/ipxe/ipxe
synced 2026-02-06 21:29:29 +03:00
302f1eeb80
Allow the active timer (providing udelay() and currticks()) to be selected at runtime based on probing during the INIT_EARLY stage of initialisation. TICKS_PER_SEC is now a fixed compile-time constant for all builds, and is independent of the underlying clock tick rate. We choose the value 1024 to allow multiplications and divisions on seconds to be converted to bit shifts. TICKS_PER_MS is defined as 1, allowing multiplications and divisions on milliseconds to be omitted entirely. The 2% inaccuracy in this definition is negligible when using the standard BIOS timer (running at around 18.2Hz). TIMER_RDTSC now checks for a constant TSC before claiming to be a usable timer. (This timer can be tested in KVM via the command-line option "-cpu host,+invtsc".) Signed-off-by: Michael Brown <mcb30@ipxe.org>
153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
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* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/ethernet.h>
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#include <ipxe/iobuf.h>
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#include <ipxe/timer.h>
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#include <ipxe/stp.h>
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/** @file
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*
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* Spanning Tree Protocol (STP)
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*
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*/
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/* Disambiguate the various error causes */
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#define ENOTSUP_PROTOCOL __einfo_error ( EINFO_ENOTSUP_PROTOCOL )
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#define EINFO_ENOTSUP_PROTOCOL \
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__einfo_uniqify ( EINFO_ENOTSUP, 0x02, \
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"Non-STP packet received" )
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#define ENOTSUP_VERSION __einfo_error ( EINFO_ENOTSUP_VERSION )
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#define EINFO_ENOTSUP_VERSION \
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__einfo_uniqify ( EINFO_ENOTSUP, 0x03, \
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"Legacy STP packet received" )
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#define ENOTSUP_TYPE __einfo_error ( EINFO_ENOTSUP_TYPE )
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#define EINFO_ENOTSUP_TYPE \
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__einfo_uniqify ( EINFO_ENOTSUP, 0x04, \
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"Non-RSTP packet received" )
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/**
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* Process incoming STP packets
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*
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* @v iobuf I/O buffer
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* @v netdev Network device
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* @v ll_source Link-layer source address
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* @v flags Packet flags
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* @ret rc Return status code
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*/
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static int stp_rx ( struct io_buffer *iobuf, struct net_device *netdev,
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const void *ll_dest __unused,
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const void *ll_source __unused,
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unsigned int flags __unused ) {
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struct stp_bpdu *stp;
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unsigned int hello;
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int rc;
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/* Sanity check */
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if ( iob_len ( iobuf ) < sizeof ( *stp ) ) {
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DBGC ( netdev, "STP %s received underlength packet (%zd "
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"bytes):\n", netdev->name, iob_len ( iobuf ) );
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DBGC_HDA ( netdev, 0, iobuf->data, iob_len ( iobuf ) );
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rc = -EINVAL;
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goto done;
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}
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stp = iobuf->data;
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/* Ignore non-RSTP packets */
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if ( stp->protocol != htons ( STP_PROTOCOL ) ) {
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DBGC ( netdev, "STP %s ignoring non-STP packet (protocol "
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"%#04x)\n", netdev->name, ntohs ( stp->protocol ) );
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rc = -ENOTSUP_PROTOCOL;
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goto done;
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}
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if ( stp->version < STP_VERSION_RSTP ) {
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DBGC ( netdev, "STP %s received legacy STP packet (version "
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"%#02x)\n", netdev->name, stp->version );
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rc = -ENOTSUP_VERSION;
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goto done;
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}
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if ( stp->type != STP_TYPE_RSTP ) {
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DBGC ( netdev, "STP %s received non-RSTP packet (type %#02x)\n",
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netdev->name, stp->type );
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rc = -ENOTSUP_TYPE;
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goto done;
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}
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/* Dump information */
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DBGC2 ( netdev, "STP %s %s port %#04x flags %#02x hello %d delay %d\n",
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netdev->name, eth_ntoa ( stp->sender.mac ), ntohs ( stp->port ),
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stp->flags, ntohs ( stp->hello ), ntohs ( stp->delay ) );
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/* Check if port is forwarding */
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if ( ! ( stp->flags & STP_FL_FORWARDING ) ) {
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/* Port is not forwarding: block link for two hello times */
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DBGC ( netdev, "STP %s %s port %#04x flags %#02x is not "
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"forwarding\n",
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netdev->name, eth_ntoa ( stp->sender.mac ),
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ntohs ( stp->port ), stp->flags );
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hello = ( ntohs ( stp->hello ) * ( TICKS_PER_SEC / 256 ) );
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netdev_link_block ( netdev, ( hello * 2 ) );
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rc = -ENETUNREACH;
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goto done;
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}
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/* Success */
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if ( netdev_link_blocked ( netdev ) ) {
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DBGC ( netdev, "STP %s %s port %#04x flags %#02x is "
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"forwarding\n",
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netdev->name, eth_ntoa ( stp->sender.mac ),
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ntohs ( stp->port ), stp->flags );
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}
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netdev_link_unblock ( netdev );
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rc = 0;
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done:
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free_iob ( iobuf );
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return rc;
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}
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/**
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* Transcribe STP address
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*
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* @v net_addr STP address
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* @ret string "<STP>"
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*
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* This operation is meaningless for the STP protocol.
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*/
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static const char * stp_ntoa ( const void *net_addr __unused ) {
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return "<STP>";
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}
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/** STP network protocol */
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struct net_protocol stp_protocol __net_protocol = {
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.name = "STP",
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.net_proto = htons ( ETH_P_STP ),
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.rx = stp_rx,
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.ntoa = stp_ntoa,
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};
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