2422 lines
74 KiB
C
2422 lines
74 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo
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* Copyright (C) 2013-2016 Universita` di Pisa
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* 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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* The header contains the definitions of constants and function
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* prototypes used only in kernelspace.
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*/
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#ifndef _NET_NETMAP_KERN_H_
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#define _NET_NETMAP_KERN_H_
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#if defined(linux)
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#if defined(CONFIG_NETMAP_EXTMEM)
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#define WITH_EXTMEM
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#endif
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#if defined(CONFIG_NETMAP_VALE)
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#define WITH_VALE
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#endif
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#if defined(CONFIG_NETMAP_PIPE)
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#define WITH_PIPES
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#endif
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#if defined(CONFIG_NETMAP_MONITOR)
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#define WITH_MONITOR
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#endif
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#if defined(CONFIG_NETMAP_GENERIC)
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#define WITH_GENERIC
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#endif
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#if defined(CONFIG_NETMAP_PTNETMAP)
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#define WITH_PTNETMAP
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#endif
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#if defined(CONFIG_NETMAP_SINK)
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#define WITH_SINK
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#endif
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#if defined(CONFIG_NETMAP_NULL)
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#define WITH_NMNULL
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#endif
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#elif defined (_WIN32)
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#define WITH_VALE // comment out to disable VALE support
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#define WITH_PIPES
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#define WITH_MONITOR
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#define WITH_GENERIC
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#define WITH_NMNULL
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#else /* neither linux nor windows */
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#define WITH_VALE // comment out to disable VALE support
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#define WITH_PIPES
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#define WITH_MONITOR
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#define WITH_GENERIC
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#define WITH_EXTMEM
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#define WITH_NMNULL
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#endif
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#if defined(__FreeBSD__)
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#include <sys/selinfo.h>
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#define likely(x) __builtin_expect((long)!!(x), 1L)
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#define unlikely(x) __builtin_expect((long)!!(x), 0L)
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#define __user
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#define NM_LOCK_T struct mtx /* low level spinlock, used to protect queues */
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#define NM_MTX_T struct sx /* OS-specific mutex (sleepable) */
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#define NM_MTX_INIT(m) sx_init(&(m), #m)
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#define NM_MTX_DESTROY(m) sx_destroy(&(m))
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#define NM_MTX_LOCK(m) sx_xlock(&(m))
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#define NM_MTX_SPINLOCK(m) while (!sx_try_xlock(&(m))) ;
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#define NM_MTX_UNLOCK(m) sx_xunlock(&(m))
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#define NM_MTX_ASSERT(m) sx_assert(&(m), SA_XLOCKED)
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#define NM_SELINFO_T struct nm_selinfo
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#define NM_SELRECORD_T struct thread
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#define MBUF_LEN(m) ((m)->m_pkthdr.len)
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#define MBUF_TXQ(m) ((m)->m_pkthdr.flowid)
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#define MBUF_TRANSMIT(na, ifp, m) ((na)->if_transmit(ifp, m))
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#define GEN_TX_MBUF_IFP(m) ((m)->m_pkthdr.rcvif)
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#define NM_ATOMIC_T volatile int /* required by atomic/bitops.h */
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/* atomic operations */
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#include <machine/atomic.h>
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#define NM_ATOMIC_TEST_AND_SET(p) (!atomic_cmpset_acq_int((p), 0, 1))
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#define NM_ATOMIC_CLEAR(p) atomic_store_rel_int((p), 0)
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#if __FreeBSD_version >= 1100030
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#define WNA(_ifp) (_ifp)->if_netmap
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#else /* older FreeBSD */
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#define WNA(_ifp) (_ifp)->if_pspare[0]
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#endif /* older FreeBSD */
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#if __FreeBSD_version >= 1100005
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struct netmap_adapter *netmap_getna(if_t ifp);
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#endif
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#if __FreeBSD_version >= 1100027
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#define MBUF_REFCNT(m) ((m)->m_ext.ext_count)
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#define SET_MBUF_REFCNT(m, x) (m)->m_ext.ext_count = x
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#else
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#define MBUF_REFCNT(m) ((m)->m_ext.ref_cnt ? *((m)->m_ext.ref_cnt) : -1)
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#define SET_MBUF_REFCNT(m, x) *((m)->m_ext.ref_cnt) = x
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#endif
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#define MBUF_QUEUED(m) 1
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struct nm_selinfo {
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/* Support for select(2) and poll(2). */
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struct selinfo si;
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/* Support for kqueue(9). See comments in netmap_freebsd.c */
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struct taskqueue *ntfytq;
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struct task ntfytask;
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struct mtx m;
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char mtxname[32];
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int kqueue_users;
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};
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struct hrtimer {
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/* Not used in FreeBSD. */
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};
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#define NM_BNS_GET(b)
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#define NM_BNS_PUT(b)
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#elif defined (linux)
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#define NM_LOCK_T safe_spinlock_t // see bsd_glue.h
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#define NM_SELINFO_T wait_queue_head_t
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#define MBUF_LEN(m) ((m)->len)
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#define MBUF_TRANSMIT(na, ifp, m) \
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({ \
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/* Avoid infinite recursion with generic. */ \
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m->priority = NM_MAGIC_PRIORITY_TX; \
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(((struct net_device_ops *)(na)->if_transmit)->ndo_start_xmit(m, ifp)); \
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0; \
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})
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/* See explanation in nm_os_generic_xmit_frame. */
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#define GEN_TX_MBUF_IFP(m) ((struct ifnet *)skb_shinfo(m)->destructor_arg)
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#define NM_ATOMIC_T volatile long unsigned int
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#define NM_MTX_T struct mutex /* OS-specific sleepable lock */
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#define NM_MTX_INIT(m) mutex_init(&(m))
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#define NM_MTX_DESTROY(m) do { (void)(m); } while (0)
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#define NM_MTX_LOCK(m) mutex_lock(&(m))
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#define NM_MTX_UNLOCK(m) mutex_unlock(&(m))
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#define NM_MTX_ASSERT(m) mutex_is_locked(&(m))
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#ifndef DEV_NETMAP
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#define DEV_NETMAP
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#endif /* DEV_NETMAP */
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#elif defined (__APPLE__)
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#warning apple support is incomplete.
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define NM_LOCK_T IOLock *
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#define NM_SELINFO_T struct selinfo
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#define MBUF_LEN(m) ((m)->m_pkthdr.len)
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#elif defined (_WIN32)
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#include "../../../WINDOWS/win_glue.h"
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#define NM_SELRECORD_T IO_STACK_LOCATION
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#define NM_SELINFO_T win_SELINFO // see win_glue.h
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#define NM_LOCK_T win_spinlock_t // see win_glue.h
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#define NM_MTX_T KGUARDED_MUTEX /* OS-specific mutex (sleepable) */
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#define NM_MTX_INIT(m) KeInitializeGuardedMutex(&m);
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#define NM_MTX_DESTROY(m) do { (void)(m); } while (0)
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#define NM_MTX_LOCK(m) KeAcquireGuardedMutex(&(m))
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#define NM_MTX_UNLOCK(m) KeReleaseGuardedMutex(&(m))
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#define NM_MTX_ASSERT(m) assert(&m.Count>0)
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//These linknames are for the NDIS driver
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#define NETMAP_NDIS_LINKNAME_STRING L"\\DosDevices\\NMAPNDIS"
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#define NETMAP_NDIS_NTDEVICE_STRING L"\\Device\\NMAPNDIS"
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//Definition of internal driver-to-driver ioctl codes
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#define NETMAP_KERNEL_XCHANGE_POINTERS _IO('i', 180)
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#define NETMAP_KERNEL_SEND_SHUTDOWN_SIGNAL _IO_direct('i', 195)
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typedef struct hrtimer{
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KTIMER timer;
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BOOLEAN active;
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KDPC deferred_proc;
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};
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/* MSVC does not have likely/unlikely support */
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#ifdef _MSC_VER
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#define likely(x) (x)
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#define unlikely(x) (x)
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#else
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#define likely(x) __builtin_expect((long)!!(x), 1L)
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#define unlikely(x) __builtin_expect((long)!!(x), 0L)
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#endif //_MSC_VER
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#else
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#error unsupported platform
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#endif /* end - platform-specific code */
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#ifndef _WIN32 /* support for emulated sysctl */
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#define SYSBEGIN(x)
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#define SYSEND
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#endif /* _WIN32 */
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#define NM_ACCESS_ONCE(x) (*(volatile __typeof__(x) *)&(x))
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#define NMG_LOCK_T NM_MTX_T
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#define NMG_LOCK_INIT() NM_MTX_INIT(netmap_global_lock)
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#define NMG_LOCK_DESTROY() NM_MTX_DESTROY(netmap_global_lock)
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#define NMG_LOCK() NM_MTX_LOCK(netmap_global_lock)
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#define NMG_UNLOCK() NM_MTX_UNLOCK(netmap_global_lock)
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#define NMG_LOCK_ASSERT() NM_MTX_ASSERT(netmap_global_lock)
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#if defined(__FreeBSD__)
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#define nm_prerr_int printf
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#define nm_prinf_int printf
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#elif defined (_WIN32)
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#define nm_prerr_int DbgPrint
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#define nm_prinf_int DbgPrint
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#elif defined(linux)
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#define nm_prerr_int(fmt, arg...) printk(KERN_ERR fmt, ##arg)
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#define nm_prinf_int(fmt, arg...) printk(KERN_INFO fmt, ##arg)
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#endif
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#define nm_prinf(format, ...) \
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do { \
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struct timeval __xxts; \
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microtime(&__xxts); \
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nm_prinf_int("%03d.%06d [%4d] %-25s " format "\n",\
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(int)__xxts.tv_sec % 1000, (int)__xxts.tv_usec, \
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__LINE__, __FUNCTION__, ##__VA_ARGS__); \
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} while (0)
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#define nm_prerr(format, ...) \
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do { \
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struct timeval __xxts; \
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microtime(&__xxts); \
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nm_prerr_int("%03d.%06d [%4d] %-25s " format "\n",\
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(int)__xxts.tv_sec % 1000, (int)__xxts.tv_usec, \
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__LINE__, __FUNCTION__, ##__VA_ARGS__); \
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} while (0)
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/* Disabled printf (used to be nm_prdis). */
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#define nm_prdis(format, ...)
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/* Rate limited, lps indicates how many per second. */
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#define nm_prlim(lps, format, ...) \
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do { \
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static int t0, __cnt; \
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if (t0 != time_second) { \
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t0 = time_second; \
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__cnt = 0; \
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} \
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if (__cnt++ < lps) \
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nm_prinf(format, ##__VA_ARGS__); \
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} while (0)
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struct netmap_adapter;
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struct nm_bdg_fwd;
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struct nm_bridge;
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struct netmap_priv_d;
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struct nm_bdg_args;
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/* os-specific NM_SELINFO_T initialzation/destruction functions */
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int nm_os_selinfo_init(NM_SELINFO_T *, const char *name);
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void nm_os_selinfo_uninit(NM_SELINFO_T *);
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const char *nm_dump_buf(char *p, int len, int lim, char *dst);
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void nm_os_selwakeup(NM_SELINFO_T *si);
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void nm_os_selrecord(NM_SELRECORD_T *sr, NM_SELINFO_T *si);
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int nm_os_ifnet_init(void);
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void nm_os_ifnet_fini(void);
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void nm_os_ifnet_lock(void);
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void nm_os_ifnet_unlock(void);
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unsigned nm_os_ifnet_mtu(struct ifnet *ifp);
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void nm_os_get_module(void);
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void nm_os_put_module(void);
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void netmap_make_zombie(struct ifnet *);
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void netmap_undo_zombie(struct ifnet *);
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/* os independent alloc/realloc/free */
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void *nm_os_malloc(size_t);
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void *nm_os_vmalloc(size_t);
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void *nm_os_realloc(void *, size_t new_size, size_t old_size);
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void nm_os_free(void *);
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void nm_os_vfree(void *);
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/* os specific attach/detach enter/exit-netmap-mode routines */
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void nm_os_onattach(struct ifnet *);
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void nm_os_ondetach(struct ifnet *);
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void nm_os_onenter(struct ifnet *);
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void nm_os_onexit(struct ifnet *);
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/* passes a packet up to the host stack.
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* If the packet is sent (or dropped) immediately it returns NULL,
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* otherwise it links the packet to prev and returns m.
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* In this case, a final call with m=NULL and prev != NULL will send up
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* the entire chain to the host stack.
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*/
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void *nm_os_send_up(struct ifnet *, struct mbuf *m, struct mbuf *prev);
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int nm_os_mbuf_has_seg_offld(struct mbuf *m);
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int nm_os_mbuf_has_csum_offld(struct mbuf *m);
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#include "netmap_mbq.h"
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extern NMG_LOCK_T netmap_global_lock;
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enum txrx { NR_RX = 0, NR_TX = 1, NR_TXRX };
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static __inline const char*
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nm_txrx2str(enum txrx t)
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{
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return (t== NR_RX ? "RX" : "TX");
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}
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static __inline enum txrx
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nm_txrx_swap(enum txrx t)
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{
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return (t== NR_RX ? NR_TX : NR_RX);
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}
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#define for_rx_tx(t) for ((t) = 0; (t) < NR_TXRX; (t)++)
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#ifdef WITH_MONITOR
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struct netmap_zmon_list {
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struct netmap_kring *next;
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struct netmap_kring *prev;
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};
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#endif /* WITH_MONITOR */
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/*
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* private, kernel view of a ring. Keeps track of the status of
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* a ring across system calls.
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*
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* nr_hwcur index of the next buffer to refill.
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* It corresponds to ring->head
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* at the time the system call returns.
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*
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* nr_hwtail index of the first buffer owned by the kernel.
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* On RX, hwcur->hwtail are receive buffers
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* not yet released. hwcur is advanced following
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* ring->head, hwtail is advanced on incoming packets,
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* and a wakeup is generated when hwtail passes ring->cur
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* On TX, hwcur->rcur have been filled by the sender
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* but not sent yet to the NIC; rcur->hwtail are available
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* for new transmissions, and hwtail->hwcur-1 are pending
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* transmissions not yet acknowledged.
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*
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* The indexes in the NIC and netmap rings are offset by nkr_hwofs slots.
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* This is so that, on a reset, buffers owned by userspace are not
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* modified by the kernel. In particular:
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* RX rings: the next empty buffer (hwtail + hwofs) coincides with
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* the next empty buffer as known by the hardware (next_to_check or so).
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* TX rings: hwcur + hwofs coincides with next_to_send
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*
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* The following fields are used to implement lock-free copy of packets
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* from input to output ports in VALE switch:
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* nkr_hwlease buffer after the last one being copied.
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* A writer in nm_bdg_flush reserves N buffers
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* from nr_hwlease, advances it, then does the
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* copy outside the lock.
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* In RX rings (used for VALE ports),
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* nkr_hwtail <= nkr_hwlease < nkr_hwcur+N-1
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* In TX rings (used for NIC or host stack ports)
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* nkr_hwcur <= nkr_hwlease < nkr_hwtail
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* nkr_leases array of nkr_num_slots where writers can report
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* completion of their block. NR_NOSLOT (~0) indicates
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* that the writer has not finished yet
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* nkr_lease_idx index of next free slot in nr_leases, to be assigned
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*
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* The kring is manipulated by txsync/rxsync and generic netmap function.
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*
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* Concurrent rxsync or txsync on the same ring are prevented through
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* by nm_kr_(try)lock() which in turn uses nr_busy. This is all we need
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* for NIC rings, and for TX rings attached to the host stack.
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*
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* RX rings attached to the host stack use an mbq (rx_queue) on both
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* rxsync_from_host() and netmap_transmit(). The mbq is protected
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* by its internal lock.
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*
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* RX rings attached to the VALE switch are accessed by both senders
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* and receiver. They are protected through the q_lock on the RX ring.
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*/
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struct netmap_kring {
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struct netmap_ring *ring;
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uint32_t nr_hwcur; /* should be nr_hwhead */
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uint32_t nr_hwtail;
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/*
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* Copies of values in user rings, so we do not need to look
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* at the ring (which could be modified). These are set in the
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* *sync_prologue()/finalize() routines.
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*/
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uint32_t rhead;
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uint32_t rcur;
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uint32_t rtail;
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uint32_t nr_kflags; /* private driver flags */
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#define NKR_PENDINTR 0x1 // Pending interrupt.
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#define NKR_EXCLUSIVE 0x2 /* exclusive binding */
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#define NKR_FORWARD 0x4 /* (host ring only) there are
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packets to forward
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*/
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#define NKR_NEEDRING 0x8 /* ring needed even if users==0
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* (used internally by pipes and
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* by ptnetmap host ports)
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*/
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#define NKR_NOINTR 0x10 /* don't use interrupts on this ring */
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#define NKR_FAKERING 0x20 /* don't allocate/free buffers */
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uint32_t nr_mode;
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uint32_t nr_pending_mode;
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#define NKR_NETMAP_OFF 0x0
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#define NKR_NETMAP_ON 0x1
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uint32_t nkr_num_slots;
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|
|
|
/*
|
|
* On a NIC reset, the NIC ring indexes may be reset but the
|
|
* indexes in the netmap rings remain the same. nkr_hwofs
|
|
* keeps track of the offset between the two.
|
|
*/
|
|
int32_t nkr_hwofs;
|
|
|
|
/* last_reclaim is opaque marker to help reduce the frequency
|
|
* of operations such as reclaiming tx buffers. A possible use
|
|
* is set it to ticks and do the reclaim only once per tick.
|
|
*/
|
|
uint64_t last_reclaim;
|
|
|
|
|
|
NM_SELINFO_T si; /* poll/select wait queue */
|
|
NM_LOCK_T q_lock; /* protects kring and ring. */
|
|
NM_ATOMIC_T nr_busy; /* prevent concurrent syscalls */
|
|
|
|
/* the adapter the owns this kring */
|
|
struct netmap_adapter *na;
|
|
|
|
/* the adapter that wants to be notified when this kring has
|
|
* new slots avaialable. This is usually the same as the above,
|
|
* but wrappers may let it point to themselves
|
|
*/
|
|
struct netmap_adapter *notify_na;
|
|
|
|
/* The following fields are for VALE switch support */
|
|
struct nm_bdg_fwd *nkr_ft;
|
|
uint32_t *nkr_leases;
|
|
#define NR_NOSLOT ((uint32_t)~0) /* used in nkr_*lease* */
|
|
uint32_t nkr_hwlease;
|
|
uint32_t nkr_lease_idx;
|
|
|
|
/* while nkr_stopped is set, no new [tr]xsync operations can
|
|
* be started on this kring.
|
|
* This is used by netmap_disable_all_rings()
|
|
* to find a synchronization point where critical data
|
|
* structures pointed to by the kring can be added or removed
|
|
*/
|
|
volatile int nkr_stopped;
|
|
|
|
/* Support for adapters without native netmap support.
|
|
* On tx rings we preallocate an array of tx buffers
|
|
* (same size as the netmap ring), on rx rings we
|
|
* store incoming mbufs in a queue that is drained by
|
|
* a rxsync.
|
|
*/
|
|
struct mbuf **tx_pool;
|
|
struct mbuf *tx_event; /* TX event used as a notification */
|
|
NM_LOCK_T tx_event_lock; /* protects the tx_event mbuf */
|
|
struct mbq rx_queue; /* intercepted rx mbufs. */
|
|
|
|
uint32_t users; /* existing bindings for this ring */
|
|
|
|
uint32_t ring_id; /* kring identifier */
|
|
enum txrx tx; /* kind of ring (tx or rx) */
|
|
char name[64]; /* diagnostic */
|
|
|
|
/* [tx]sync callback for this kring.
|
|
* The default nm_kring_create callback (netmap_krings_create)
|
|
* sets the nm_sync callback of each hardware tx(rx) kring to
|
|
* the corresponding nm_txsync(nm_rxsync) taken from the
|
|
* netmap_adapter; moreover, it sets the sync callback
|
|
* of the host tx(rx) ring to netmap_txsync_to_host
|
|
* (netmap_rxsync_from_host).
|
|
*
|
|
* Overrides: the above configuration is not changed by
|
|
* any of the nm_krings_create callbacks.
|
|
*/
|
|
int (*nm_sync)(struct netmap_kring *kring, int flags);
|
|
int (*nm_notify)(struct netmap_kring *kring, int flags);
|
|
|
|
#ifdef WITH_PIPES
|
|
struct netmap_kring *pipe; /* if this is a pipe ring,
|
|
* pointer to the other end
|
|
*/
|
|
uint32_t pipe_tail; /* hwtail updated by the other end */
|
|
#endif /* WITH_PIPES */
|
|
|
|
int (*save_notify)(struct netmap_kring *kring, int flags);
|
|
|
|
#ifdef WITH_MONITOR
|
|
/* array of krings that are monitoring this kring */
|
|
struct netmap_kring **monitors;
|
|
uint32_t max_monitors; /* current size of the monitors array */
|
|
uint32_t n_monitors; /* next unused entry in the monitor array */
|
|
uint32_t mon_pos[NR_TXRX]; /* index of this ring in the monitored ring array */
|
|
uint32_t mon_tail; /* last seen slot on rx */
|
|
|
|
/* circular list of zero-copy monitors */
|
|
struct netmap_zmon_list zmon_list[NR_TXRX];
|
|
|
|
/*
|
|
* Monitors work by intercepting the sync and notify callbacks of the
|
|
* monitored krings. This is implemented by replacing the pointers
|
|
* above and saving the previous ones in mon_* pointers below
|
|
*/
|
|
int (*mon_sync)(struct netmap_kring *kring, int flags);
|
|
int (*mon_notify)(struct netmap_kring *kring, int flags);
|
|
|
|
#endif
|
|
}
|
|
#ifdef _WIN32
|
|
__declspec(align(64));
|
|
#else
|
|
__attribute__((__aligned__(64)));
|
|
#endif
|
|
|
|
/* return 1 iff the kring needs to be turned on */
|
|
static inline int
|
|
nm_kring_pending_on(struct netmap_kring *kring)
|
|
{
|
|
return kring->nr_pending_mode == NKR_NETMAP_ON &&
|
|
kring->nr_mode == NKR_NETMAP_OFF;
|
|
}
|
|
|
|
/* return 1 iff the kring needs to be turned off */
|
|
static inline int
|
|
nm_kring_pending_off(struct netmap_kring *kring)
|
|
{
|
|
return kring->nr_pending_mode == NKR_NETMAP_OFF &&
|
|
kring->nr_mode == NKR_NETMAP_ON;
|
|
}
|
|
|
|
/* return the next index, with wraparound */
|
|
static inline uint32_t
|
|
nm_next(uint32_t i, uint32_t lim)
|
|
{
|
|
return unlikely (i == lim) ? 0 : i + 1;
|
|
}
|
|
|
|
|
|
/* return the previous index, with wraparound */
|
|
static inline uint32_t
|
|
nm_prev(uint32_t i, uint32_t lim)
|
|
{
|
|
return unlikely (i == 0) ? lim : i - 1;
|
|
}
|
|
|
|
|
|
/*
|
|
*
|
|
* Here is the layout for the Rx and Tx rings.
|
|
|
|
RxRING TxRING
|
|
|
|
+-----------------+ +-----------------+
|
|
| | | |
|
|
| free | | free |
|
|
+-----------------+ +-----------------+
|
|
head->| owned by user |<-hwcur | not sent to nic |<-hwcur
|
|
| | | yet |
|
|
+-----------------+ | |
|
|
cur->| available to | | |
|
|
| user, not read | +-----------------+
|
|
| yet | cur->| (being |
|
|
| | | prepared) |
|
|
| | | |
|
|
+-----------------+ + ------ +
|
|
tail->| |<-hwtail | |<-hwlease
|
|
| (being | ... | | ...
|
|
| prepared) | ... | | ...
|
|
+-----------------+ ... | | ...
|
|
| |<-hwlease +-----------------+
|
|
| | tail->| |<-hwtail
|
|
| | | |
|
|
| | | |
|
|
| | | |
|
|
+-----------------+ +-----------------+
|
|
|
|
* The cur/tail (user view) and hwcur/hwtail (kernel view)
|
|
* are used in the normal operation of the card.
|
|
*
|
|
* When a ring is the output of a switch port (Rx ring for
|
|
* a VALE port, Tx ring for the host stack or NIC), slots
|
|
* are reserved in blocks through 'hwlease' which points
|
|
* to the next unused slot.
|
|
* On an Rx ring, hwlease is always after hwtail,
|
|
* and completions cause hwtail to advance.
|
|
* On a Tx ring, hwlease is always between cur and hwtail,
|
|
* and completions cause cur to advance.
|
|
*
|
|
* nm_kr_space() returns the maximum number of slots that
|
|
* can be assigned.
|
|
* nm_kr_lease() reserves the required number of buffers,
|
|
* advances nkr_hwlease and also returns an entry in
|
|
* a circular array where completions should be reported.
|
|
*/
|
|
|
|
struct lut_entry;
|
|
#ifdef __FreeBSD__
|
|
#define plut_entry lut_entry
|
|
#endif
|
|
|
|
struct netmap_lut {
|
|
struct lut_entry *lut;
|
|
struct plut_entry *plut;
|
|
uint32_t objtotal; /* max buffer index */
|
|
uint32_t objsize; /* buffer size */
|
|
};
|
|
|
|
struct netmap_vp_adapter; // forward
|
|
struct nm_bridge;
|
|
|
|
/* Struct to be filled by nm_config callbacks. */
|
|
struct nm_config_info {
|
|
unsigned num_tx_rings;
|
|
unsigned num_rx_rings;
|
|
unsigned num_tx_descs;
|
|
unsigned num_rx_descs;
|
|
unsigned rx_buf_maxsize;
|
|
};
|
|
|
|
/*
|
|
* default type for the magic field.
|
|
* May be overriden in glue code.
|
|
*/
|
|
#ifndef NM_OS_MAGIC
|
|
#define NM_OS_MAGIC uint32_t
|
|
#endif /* !NM_OS_MAGIC */
|
|
|
|
/*
|
|
* The "struct netmap_adapter" extends the "struct adapter"
|
|
* (or equivalent) device descriptor.
|
|
* It contains all base fields needed to support netmap operation.
|
|
* There are in fact different types of netmap adapters
|
|
* (native, generic, VALE switch...) so a netmap_adapter is
|
|
* just the first field in the derived type.
|
|
*/
|
|
struct netmap_adapter {
|
|
/*
|
|
* On linux we do not have a good way to tell if an interface
|
|
* is netmap-capable. So we always use the following trick:
|
|
* NA(ifp) points here, and the first entry (which hopefully
|
|
* always exists and is at least 32 bits) contains a magic
|
|
* value which we can use to detect that the interface is good.
|
|
*/
|
|
NM_OS_MAGIC magic;
|
|
uint32_t na_flags; /* enabled, and other flags */
|
|
#define NAF_SKIP_INTR 1 /* use the regular interrupt handler.
|
|
* useful during initialization
|
|
*/
|
|
#define NAF_SW_ONLY 2 /* forward packets only to sw adapter */
|
|
#define NAF_BDG_MAYSLEEP 4 /* the bridge is allowed to sleep when
|
|
* forwarding packets coming from this
|
|
* interface
|
|
*/
|
|
#define NAF_MEM_OWNER 8 /* the adapter uses its own memory area
|
|
* that cannot be changed
|
|
*/
|
|
#define NAF_NATIVE 16 /* the adapter is native.
|
|
* Virtual ports (non persistent vale ports,
|
|
* pipes, monitors...) should never use
|
|
* this flag.
|
|
*/
|
|
#define NAF_NETMAP_ON 32 /* netmap is active (either native or
|
|
* emulated). Where possible (e.g. FreeBSD)
|
|
* IFCAP_NETMAP also mirrors this flag.
|
|
*/
|
|
#define NAF_HOST_RINGS 64 /* the adapter supports the host rings */
|
|
#define NAF_FORCE_NATIVE 128 /* the adapter is always NATIVE */
|
|
/* free */
|
|
#define NAF_MOREFRAG 512 /* the adapter supports NS_MOREFRAG */
|
|
#define NAF_ZOMBIE (1U<<30) /* the nic driver has been unloaded */
|
|
#define NAF_BUSY (1U<<31) /* the adapter is used internally and
|
|
* cannot be registered from userspace
|
|
*/
|
|
int active_fds; /* number of user-space descriptors using this
|
|
interface, which is equal to the number of
|
|
struct netmap_if objs in the mapped region. */
|
|
|
|
u_int num_rx_rings; /* number of adapter receive rings */
|
|
u_int num_tx_rings; /* number of adapter transmit rings */
|
|
u_int num_host_rx_rings; /* number of host receive rings */
|
|
u_int num_host_tx_rings; /* number of host transmit rings */
|
|
|
|
u_int num_tx_desc; /* number of descriptor in each queue */
|
|
u_int num_rx_desc;
|
|
|
|
/* tx_rings and rx_rings are private but allocated as a
|
|
* contiguous chunk of memory. Each array has N+K entries,
|
|
* N for the hardware rings and K for the host rings.
|
|
*/
|
|
struct netmap_kring **tx_rings; /* array of TX rings. */
|
|
struct netmap_kring **rx_rings; /* array of RX rings. */
|
|
|
|
void *tailroom; /* space below the rings array */
|
|
/* (used for leases) */
|
|
|
|
|
|
NM_SELINFO_T si[NR_TXRX]; /* global wait queues */
|
|
|
|
/* count users of the global wait queues */
|
|
int si_users[NR_TXRX];
|
|
|
|
void *pdev; /* used to store pci device */
|
|
|
|
/* copy of if_qflush and if_transmit pointers, to intercept
|
|
* packets from the network stack when netmap is active.
|
|
*/
|
|
int (*if_transmit)(struct ifnet *, struct mbuf *);
|
|
|
|
/* copy of if_input for netmap_send_up() */
|
|
void (*if_input)(struct ifnet *, struct mbuf *);
|
|
|
|
/* Back reference to the parent ifnet struct. Used for
|
|
* hardware ports (emulated netmap included). */
|
|
struct ifnet *ifp; /* adapter is ifp->if_softc */
|
|
|
|
/*---- callbacks for this netmap adapter -----*/
|
|
/*
|
|
* nm_dtor() is the cleanup routine called when destroying
|
|
* the adapter.
|
|
* Called with NMG_LOCK held.
|
|
*
|
|
* nm_register() is called on NIOCREGIF and close() to enter
|
|
* or exit netmap mode on the NIC
|
|
* Called with NNG_LOCK held.
|
|
*
|
|
* nm_txsync() pushes packets to the underlying hw/switch
|
|
*
|
|
* nm_rxsync() collects packets from the underlying hw/switch
|
|
*
|
|
* nm_config() returns configuration information from the OS
|
|
* Called with NMG_LOCK held.
|
|
*
|
|
* nm_krings_create() create and init the tx_rings and
|
|
* rx_rings arrays of kring structures. In particular,
|
|
* set the nm_sync callbacks for each ring.
|
|
* There is no need to also allocate the corresponding
|
|
* netmap_rings, since netmap_mem_rings_create() will always
|
|
* be called to provide the missing ones.
|
|
* Called with NNG_LOCK held.
|
|
*
|
|
* nm_krings_delete() cleanup and delete the tx_rings and rx_rings
|
|
* arrays
|
|
* Called with NMG_LOCK held.
|
|
*
|
|
* nm_notify() is used to act after data have become available
|
|
* (or the stopped state of the ring has changed)
|
|
* For hw devices this is typically a selwakeup(),
|
|
* but for NIC/host ports attached to a switch (or vice-versa)
|
|
* we also need to invoke the 'txsync' code downstream.
|
|
* This callback pointer is actually used only to initialize
|
|
* kring->nm_notify.
|
|
* Return values are the same as for netmap_rx_irq().
|
|
*/
|
|
void (*nm_dtor)(struct netmap_adapter *);
|
|
|
|
int (*nm_register)(struct netmap_adapter *, int onoff);
|
|
void (*nm_intr)(struct netmap_adapter *, int onoff);
|
|
|
|
int (*nm_txsync)(struct netmap_kring *kring, int flags);
|
|
int (*nm_rxsync)(struct netmap_kring *kring, int flags);
|
|
int (*nm_notify)(struct netmap_kring *kring, int flags);
|
|
#define NAF_FORCE_READ 1
|
|
#define NAF_FORCE_RECLAIM 2
|
|
#define NAF_CAN_FORWARD_DOWN 4
|
|
/* return configuration information */
|
|
int (*nm_config)(struct netmap_adapter *, struct nm_config_info *info);
|
|
int (*nm_krings_create)(struct netmap_adapter *);
|
|
void (*nm_krings_delete)(struct netmap_adapter *);
|
|
/*
|
|
* nm_bdg_attach() initializes the na_vp field to point
|
|
* to an adapter that can be attached to a VALE switch. If the
|
|
* current adapter is already a VALE port, na_vp is simply a cast;
|
|
* otherwise, na_vp points to a netmap_bwrap_adapter.
|
|
* If applicable, this callback also initializes na_hostvp,
|
|
* that can be used to connect the adapter host rings to the
|
|
* switch.
|
|
* Called with NMG_LOCK held.
|
|
*
|
|
* nm_bdg_ctl() is called on the actual attach/detach to/from
|
|
* to/from the switch, to perform adapter-specific
|
|
* initializations
|
|
* Called with NMG_LOCK held.
|
|
*/
|
|
int (*nm_bdg_attach)(const char *bdg_name, struct netmap_adapter *,
|
|
struct nm_bridge *);
|
|
int (*nm_bdg_ctl)(struct nmreq_header *, struct netmap_adapter *);
|
|
|
|
/* adapter used to attach this adapter to a VALE switch (if any) */
|
|
struct netmap_vp_adapter *na_vp;
|
|
/* adapter used to attach the host rings of this adapter
|
|
* to a VALE switch (if any) */
|
|
struct netmap_vp_adapter *na_hostvp;
|
|
|
|
/* standard refcount to control the lifetime of the adapter
|
|
* (it should be equal to the lifetime of the corresponding ifp)
|
|
*/
|
|
int na_refcount;
|
|
|
|
/* memory allocator (opaque)
|
|
* We also cache a pointer to the lut_entry for translating
|
|
* buffer addresses, the total number of buffers and the buffer size.
|
|
*/
|
|
struct netmap_mem_d *nm_mem;
|
|
struct netmap_mem_d *nm_mem_prev;
|
|
struct netmap_lut na_lut;
|
|
|
|
/* additional information attached to this adapter
|
|
* by other netmap subsystems. Currently used by
|
|
* bwrap, LINUX/v1000 and ptnetmap
|
|
*/
|
|
void *na_private;
|
|
|
|
/* array of pipes that have this adapter as a parent */
|
|
struct netmap_pipe_adapter **na_pipes;
|
|
int na_next_pipe; /* next free slot in the array */
|
|
int na_max_pipes; /* size of the array */
|
|
|
|
/* Offset of ethernet header for each packet. */
|
|
u_int virt_hdr_len;
|
|
|
|
/* Max number of bytes that the NIC can store in the buffer
|
|
* referenced by each RX descriptor. This translates to the maximum
|
|
* bytes that a single netmap slot can reference. Larger packets
|
|
* require NS_MOREFRAG support. */
|
|
unsigned rx_buf_maxsize;
|
|
|
|
char name[NETMAP_REQ_IFNAMSIZ]; /* used at least by pipes */
|
|
|
|
#ifdef WITH_MONITOR
|
|
unsigned long monitor_id; /* debugging */
|
|
#endif
|
|
};
|
|
|
|
static __inline u_int
|
|
nma_get_ndesc(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return (t == NR_TX ? na->num_tx_desc : na->num_rx_desc);
|
|
}
|
|
|
|
static __inline void
|
|
nma_set_ndesc(struct netmap_adapter *na, enum txrx t, u_int v)
|
|
{
|
|
if (t == NR_TX)
|
|
na->num_tx_desc = v;
|
|
else
|
|
na->num_rx_desc = v;
|
|
}
|
|
|
|
static __inline u_int
|
|
nma_get_nrings(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return (t == NR_TX ? na->num_tx_rings : na->num_rx_rings);
|
|
}
|
|
|
|
static __inline u_int
|
|
nma_get_host_nrings(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return (t == NR_TX ? na->num_host_tx_rings : na->num_host_rx_rings);
|
|
}
|
|
|
|
static __inline void
|
|
nma_set_nrings(struct netmap_adapter *na, enum txrx t, u_int v)
|
|
{
|
|
if (t == NR_TX)
|
|
na->num_tx_rings = v;
|
|
else
|
|
na->num_rx_rings = v;
|
|
}
|
|
|
|
static __inline void
|
|
nma_set_host_nrings(struct netmap_adapter *na, enum txrx t, u_int v)
|
|
{
|
|
if (t == NR_TX)
|
|
na->num_host_tx_rings = v;
|
|
else
|
|
na->num_host_rx_rings = v;
|
|
}
|
|
|
|
static __inline struct netmap_kring**
|
|
NMR(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return (t == NR_TX ? na->tx_rings : na->rx_rings);
|
|
}
|
|
|
|
int nma_intr_enable(struct netmap_adapter *na, int onoff);
|
|
|
|
/*
|
|
* If the NIC is owned by the kernel
|
|
* (i.e., bridge), neither another bridge nor user can use it;
|
|
* if the NIC is owned by a user, only users can share it.
|
|
* Evaluation must be done under NMG_LOCK().
|
|
*/
|
|
#define NETMAP_OWNED_BY_KERN(na) ((na)->na_flags & NAF_BUSY)
|
|
#define NETMAP_OWNED_BY_ANY(na) \
|
|
(NETMAP_OWNED_BY_KERN(na) || ((na)->active_fds > 0))
|
|
|
|
/*
|
|
* derived netmap adapters for various types of ports
|
|
*/
|
|
struct netmap_vp_adapter { /* VALE software port */
|
|
struct netmap_adapter up;
|
|
|
|
/*
|
|
* Bridge support:
|
|
*
|
|
* bdg_port is the port number used in the bridge;
|
|
* na_bdg points to the bridge this NA is attached to.
|
|
*/
|
|
int bdg_port;
|
|
struct nm_bridge *na_bdg;
|
|
int retry;
|
|
int autodelete; /* remove the ifp on last reference */
|
|
|
|
/* Maximum Frame Size, used in bdg_mismatch_datapath() */
|
|
u_int mfs;
|
|
/* Last source MAC on this port */
|
|
uint64_t last_smac;
|
|
};
|
|
|
|
|
|
struct netmap_hw_adapter { /* physical device */
|
|
struct netmap_adapter up;
|
|
|
|
#ifdef linux
|
|
struct net_device_ops nm_ndo;
|
|
struct ethtool_ops nm_eto;
|
|
#endif
|
|
const struct ethtool_ops* save_ethtool;
|
|
|
|
int (*nm_hw_register)(struct netmap_adapter *, int onoff);
|
|
};
|
|
|
|
#ifdef WITH_GENERIC
|
|
/* Mitigation support. */
|
|
struct nm_generic_mit {
|
|
struct hrtimer mit_timer;
|
|
int mit_pending;
|
|
int mit_ring_idx; /* index of the ring being mitigated */
|
|
struct netmap_adapter *mit_na; /* backpointer */
|
|
};
|
|
|
|
struct netmap_generic_adapter { /* emulated device */
|
|
struct netmap_hw_adapter up;
|
|
|
|
/* Pointer to a previously used netmap adapter. */
|
|
struct netmap_adapter *prev;
|
|
|
|
/* Emulated netmap adapters support:
|
|
* - save_if_input saves the if_input hook (FreeBSD);
|
|
* - mit implements rx interrupt mitigation;
|
|
*/
|
|
void (*save_if_input)(struct ifnet *, struct mbuf *);
|
|
|
|
struct nm_generic_mit *mit;
|
|
#ifdef linux
|
|
netdev_tx_t (*save_start_xmit)(struct mbuf *, struct ifnet *);
|
|
#endif
|
|
/* Is the adapter able to use multiple RX slots to scatter
|
|
* each packet pushed up by the driver? */
|
|
int rxsg;
|
|
|
|
/* Is the transmission path controlled by a netmap-aware
|
|
* device queue (i.e. qdisc on linux)? */
|
|
int txqdisc;
|
|
};
|
|
#endif /* WITH_GENERIC */
|
|
|
|
static __inline u_int
|
|
netmap_real_rings(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return nma_get_nrings(na, t) +
|
|
!!(na->na_flags & NAF_HOST_RINGS) * nma_get_host_nrings(na, t);
|
|
}
|
|
|
|
/* account for fake rings */
|
|
static __inline u_int
|
|
netmap_all_rings(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return max(nma_get_nrings(na, t) + 1, netmap_real_rings(na, t));
|
|
}
|
|
|
|
int netmap_default_bdg_attach(const char *name, struct netmap_adapter *na,
|
|
struct nm_bridge *);
|
|
struct nm_bdg_polling_state;
|
|
/*
|
|
* Bridge wrapper for non VALE ports attached to a VALE switch.
|
|
*
|
|
* The real device must already have its own netmap adapter (hwna).
|
|
* The bridge wrapper and the hwna adapter share the same set of
|
|
* netmap rings and buffers, but they have two separate sets of
|
|
* krings descriptors, with tx/rx meanings swapped:
|
|
*
|
|
* netmap
|
|
* bwrap krings rings krings hwna
|
|
* +------+ +------+ +-----+ +------+ +------+
|
|
* |tx_rings->| |\ /| |----| |<-tx_rings|
|
|
* | | +------+ \ / +-----+ +------+ | |
|
|
* | | X | |
|
|
* | | / \ | |
|
|
* | | +------+/ \+-----+ +------+ | |
|
|
* |rx_rings->| | | |----| |<-rx_rings|
|
|
* | | +------+ +-----+ +------+ | |
|
|
* +------+ +------+
|
|
*
|
|
* - packets coming from the bridge go to the brwap rx rings,
|
|
* which are also the hwna tx rings. The bwrap notify callback
|
|
* will then complete the hwna tx (see netmap_bwrap_notify).
|
|
*
|
|
* - packets coming from the outside go to the hwna rx rings,
|
|
* which are also the bwrap tx rings. The (overwritten) hwna
|
|
* notify method will then complete the bridge tx
|
|
* (see netmap_bwrap_intr_notify).
|
|
*
|
|
* The bridge wrapper may optionally connect the hwna 'host' rings
|
|
* to the bridge. This is done by using a second port in the
|
|
* bridge and connecting it to the 'host' netmap_vp_adapter
|
|
* contained in the netmap_bwrap_adapter. The brwap host adapter
|
|
* cross-links the hwna host rings in the same way as shown above.
|
|
*
|
|
* - packets coming from the bridge and directed to the host stack
|
|
* are handled by the bwrap host notify callback
|
|
* (see netmap_bwrap_host_notify)
|
|
*
|
|
* - packets coming from the host stack are still handled by the
|
|
* overwritten hwna notify callback (netmap_bwrap_intr_notify),
|
|
* but are diverted to the host adapter depending on the ring number.
|
|
*
|
|
*/
|
|
struct netmap_bwrap_adapter {
|
|
struct netmap_vp_adapter up;
|
|
struct netmap_vp_adapter host; /* for host rings */
|
|
struct netmap_adapter *hwna; /* the underlying device */
|
|
|
|
/*
|
|
* When we attach a physical interface to the bridge, we
|
|
* allow the controlling process to terminate, so we need
|
|
* a place to store the n_detmap_priv_d data structure.
|
|
* This is only done when physical interfaces
|
|
* are attached to a bridge.
|
|
*/
|
|
struct netmap_priv_d *na_kpriv;
|
|
struct nm_bdg_polling_state *na_polling_state;
|
|
/* we overwrite the hwna->na_vp pointer, so we save
|
|
* here its original value, to be restored at detach
|
|
*/
|
|
struct netmap_vp_adapter *saved_na_vp;
|
|
};
|
|
int nm_bdg_polling(struct nmreq_header *hdr);
|
|
|
|
#ifdef WITH_VALE
|
|
int netmap_vale_attach(struct nmreq_header *hdr, void *auth_token);
|
|
int netmap_vale_detach(struct nmreq_header *hdr, void *auth_token);
|
|
int netmap_vale_list(struct nmreq_header *hdr);
|
|
int netmap_vi_create(struct nmreq_header *hdr, int);
|
|
int nm_vi_create(struct nmreq_header *);
|
|
int nm_vi_destroy(const char *name);
|
|
#else /* !WITH_VALE */
|
|
#define netmap_vi_create(hdr, a) (EOPNOTSUPP)
|
|
#endif /* WITH_VALE */
|
|
|
|
#ifdef WITH_PIPES
|
|
|
|
#define NM_MAXPIPES 64 /* max number of pipes per adapter */
|
|
|
|
struct netmap_pipe_adapter {
|
|
/* pipe identifier is up.name */
|
|
struct netmap_adapter up;
|
|
|
|
#define NM_PIPE_ROLE_MASTER 0x1
|
|
#define NM_PIPE_ROLE_SLAVE 0x2
|
|
int role; /* either NM_PIPE_ROLE_MASTER or NM_PIPE_ROLE_SLAVE */
|
|
|
|
struct netmap_adapter *parent; /* adapter that owns the memory */
|
|
struct netmap_pipe_adapter *peer; /* the other end of the pipe */
|
|
int peer_ref; /* 1 iff we are holding a ref to the peer */
|
|
struct ifnet *parent_ifp; /* maybe null */
|
|
|
|
u_int parent_slot; /* index in the parent pipe array */
|
|
};
|
|
|
|
#endif /* WITH_PIPES */
|
|
|
|
#ifdef WITH_NMNULL
|
|
struct netmap_null_adapter {
|
|
struct netmap_adapter up;
|
|
};
|
|
#endif /* WITH_NMNULL */
|
|
|
|
|
|
/* return slots reserved to rx clients; used in drivers */
|
|
static inline uint32_t
|
|
nm_kr_rxspace(struct netmap_kring *k)
|
|
{
|
|
int space = k->nr_hwtail - k->nr_hwcur;
|
|
if (space < 0)
|
|
space += k->nkr_num_slots;
|
|
nm_prdis("preserving %d rx slots %d -> %d", space, k->nr_hwcur, k->nr_hwtail);
|
|
|
|
return space;
|
|
}
|
|
|
|
/* return slots reserved to tx clients */
|
|
#define nm_kr_txspace(_k) nm_kr_rxspace(_k)
|
|
|
|
|
|
/* True if no space in the tx ring, only valid after txsync_prologue */
|
|
static inline int
|
|
nm_kr_txempty(struct netmap_kring *kring)
|
|
{
|
|
return kring->rhead == kring->nr_hwtail;
|
|
}
|
|
|
|
/* True if no more completed slots in the rx ring, only valid after
|
|
* rxsync_prologue */
|
|
#define nm_kr_rxempty(_k) nm_kr_txempty(_k)
|
|
|
|
/* True if the application needs to wait for more space on the ring
|
|
* (more received packets or more free tx slots).
|
|
* Only valid after *xsync_prologue. */
|
|
static inline int
|
|
nm_kr_wouldblock(struct netmap_kring *kring)
|
|
{
|
|
return kring->rcur == kring->nr_hwtail;
|
|
}
|
|
|
|
/*
|
|
* protect against multiple threads using the same ring.
|
|
* also check that the ring has not been stopped or locked
|
|
*/
|
|
#define NM_KR_BUSY 1 /* some other thread is syncing the ring */
|
|
#define NM_KR_STOPPED 2 /* unbounded stop (ifconfig down or driver unload) */
|
|
#define NM_KR_LOCKED 3 /* bounded, brief stop for mutual exclusion */
|
|
|
|
|
|
/* release the previously acquired right to use the *sync() methods of the ring */
|
|
static __inline void nm_kr_put(struct netmap_kring *kr)
|
|
{
|
|
NM_ATOMIC_CLEAR(&kr->nr_busy);
|
|
}
|
|
|
|
|
|
/* true if the ifp that backed the adapter has disappeared (e.g., the
|
|
* driver has been unloaded)
|
|
*/
|
|
static inline int nm_iszombie(struct netmap_adapter *na);
|
|
|
|
/* try to obtain exclusive right to issue the *sync() operations on the ring.
|
|
* The right is obtained and must be later relinquished via nm_kr_put() if and
|
|
* only if nm_kr_tryget() returns 0.
|
|
* If can_sleep is 1 there are only two other possible outcomes:
|
|
* - the function returns NM_KR_BUSY
|
|
* - the function returns NM_KR_STOPPED and sets the POLLERR bit in *perr
|
|
* (if non-null)
|
|
* In both cases the caller will typically skip the ring, possibly collecting
|
|
* errors along the way.
|
|
* If the calling context does not allow sleeping, the caller must pass 0 in can_sleep.
|
|
* In the latter case, the function may also return NM_KR_LOCKED and leave *perr
|
|
* untouched: ideally, the caller should try again at a later time.
|
|
*/
|
|
static __inline int nm_kr_tryget(struct netmap_kring *kr, int can_sleep, int *perr)
|
|
{
|
|
int busy = 1, stopped;
|
|
/* check a first time without taking the lock
|
|
* to avoid starvation for nm_kr_get()
|
|
*/
|
|
retry:
|
|
stopped = kr->nkr_stopped;
|
|
if (unlikely(stopped)) {
|
|
goto stop;
|
|
}
|
|
busy = NM_ATOMIC_TEST_AND_SET(&kr->nr_busy);
|
|
/* we should not return NM_KR_BUSY if the ring was
|
|
* actually stopped, so check another time after
|
|
* the barrier provided by the atomic operation
|
|
*/
|
|
stopped = kr->nkr_stopped;
|
|
if (unlikely(stopped)) {
|
|
goto stop;
|
|
}
|
|
|
|
if (unlikely(nm_iszombie(kr->na))) {
|
|
stopped = NM_KR_STOPPED;
|
|
goto stop;
|
|
}
|
|
|
|
return unlikely(busy) ? NM_KR_BUSY : 0;
|
|
|
|
stop:
|
|
if (!busy)
|
|
nm_kr_put(kr);
|
|
if (stopped == NM_KR_STOPPED) {
|
|
/* if POLLERR is defined we want to use it to simplify netmap_poll().
|
|
* Otherwise, any non-zero value will do.
|
|
*/
|
|
#ifdef POLLERR
|
|
#define NM_POLLERR POLLERR
|
|
#else
|
|
#define NM_POLLERR 1
|
|
#endif /* POLLERR */
|
|
if (perr)
|
|
*perr |= NM_POLLERR;
|
|
#undef NM_POLLERR
|
|
} else if (can_sleep) {
|
|
tsleep(kr, 0, "NM_KR_TRYGET", 4);
|
|
goto retry;
|
|
}
|
|
return stopped;
|
|
}
|
|
|
|
/* put the ring in the 'stopped' state and wait for the current user (if any) to
|
|
* notice. stopped must be either NM_KR_STOPPED or NM_KR_LOCKED
|
|
*/
|
|
static __inline void nm_kr_stop(struct netmap_kring *kr, int stopped)
|
|
{
|
|
kr->nkr_stopped = stopped;
|
|
while (NM_ATOMIC_TEST_AND_SET(&kr->nr_busy))
|
|
tsleep(kr, 0, "NM_KR_GET", 4);
|
|
}
|
|
|
|
/* restart a ring after a stop */
|
|
static __inline void nm_kr_start(struct netmap_kring *kr)
|
|
{
|
|
kr->nkr_stopped = 0;
|
|
nm_kr_put(kr);
|
|
}
|
|
|
|
|
|
/*
|
|
* The following functions are used by individual drivers to
|
|
* support netmap operation.
|
|
*
|
|
* netmap_attach() initializes a struct netmap_adapter, allocating the
|
|
* struct netmap_ring's and the struct selinfo.
|
|
*
|
|
* netmap_detach() frees the memory allocated by netmap_attach().
|
|
*
|
|
* netmap_transmit() replaces the if_transmit routine of the interface,
|
|
* and is used to intercept packets coming from the stack.
|
|
*
|
|
* netmap_load_map/netmap_reload_map are helper routines to set/reset
|
|
* the dmamap for a packet buffer
|
|
*
|
|
* netmap_reset() is a helper routine to be called in the hw driver
|
|
* when reinitializing a ring. It should not be called by
|
|
* virtual ports (vale, pipes, monitor)
|
|
*/
|
|
int netmap_attach(struct netmap_adapter *);
|
|
int netmap_attach_ext(struct netmap_adapter *, size_t size, int override_reg);
|
|
void netmap_detach(struct ifnet *);
|
|
int netmap_transmit(struct ifnet *, struct mbuf *);
|
|
struct netmap_slot *netmap_reset(struct netmap_adapter *na,
|
|
enum txrx tx, u_int n, u_int new_cur);
|
|
int netmap_ring_reinit(struct netmap_kring *);
|
|
int netmap_rings_config_get(struct netmap_adapter *, struct nm_config_info *);
|
|
|
|
/* Return codes for netmap_*x_irq. */
|
|
enum {
|
|
/* Driver should do normal interrupt processing, e.g. because
|
|
* the interface is not in netmap mode. */
|
|
NM_IRQ_PASS = 0,
|
|
/* Port is in netmap mode, and the interrupt work has been
|
|
* completed. The driver does not have to notify netmap
|
|
* again before the next interrupt. */
|
|
NM_IRQ_COMPLETED = -1,
|
|
/* Port is in netmap mode, but the interrupt work has not been
|
|
* completed. The driver has to make sure netmap will be
|
|
* notified again soon, even if no more interrupts come (e.g.
|
|
* on Linux the driver should not call napi_complete()). */
|
|
NM_IRQ_RESCHED = -2,
|
|
};
|
|
|
|
/* default functions to handle rx/tx interrupts */
|
|
int netmap_rx_irq(struct ifnet *, u_int, u_int *);
|
|
#define netmap_tx_irq(_n, _q) netmap_rx_irq(_n, _q, NULL)
|
|
int netmap_common_irq(struct netmap_adapter *, u_int, u_int *work_done);
|
|
|
|
|
|
#ifdef WITH_VALE
|
|
/* functions used by external modules to interface with VALE */
|
|
#define netmap_vp_to_ifp(_vp) ((_vp)->up.ifp)
|
|
#define netmap_ifp_to_vp(_ifp) (NA(_ifp)->na_vp)
|
|
#define netmap_ifp_to_host_vp(_ifp) (NA(_ifp)->na_hostvp)
|
|
#define netmap_bdg_idx(_vp) ((_vp)->bdg_port)
|
|
const char *netmap_bdg_name(struct netmap_vp_adapter *);
|
|
#else /* !WITH_VALE */
|
|
#define netmap_vp_to_ifp(_vp) NULL
|
|
#define netmap_ifp_to_vp(_ifp) NULL
|
|
#define netmap_ifp_to_host_vp(_ifp) NULL
|
|
#define netmap_bdg_idx(_vp) -1
|
|
#endif /* WITH_VALE */
|
|
|
|
static inline int
|
|
nm_netmap_on(struct netmap_adapter *na)
|
|
{
|
|
return na && na->na_flags & NAF_NETMAP_ON;
|
|
}
|
|
|
|
static inline int
|
|
nm_native_on(struct netmap_adapter *na)
|
|
{
|
|
return nm_netmap_on(na) && (na->na_flags & NAF_NATIVE);
|
|
}
|
|
|
|
static inline struct netmap_kring *
|
|
netmap_kring_on(struct netmap_adapter *na, u_int q, enum txrx t)
|
|
{
|
|
struct netmap_kring *kring = NULL;
|
|
|
|
if (!nm_native_on(na))
|
|
return NULL;
|
|
|
|
if (t == NR_RX && q < na->num_rx_rings)
|
|
kring = na->rx_rings[q];
|
|
else if (t == NR_TX && q < na->num_tx_rings)
|
|
kring = na->tx_rings[q];
|
|
else
|
|
return NULL;
|
|
|
|
return (kring->nr_mode == NKR_NETMAP_ON) ? kring : NULL;
|
|
}
|
|
|
|
static inline int
|
|
nm_iszombie(struct netmap_adapter *na)
|
|
{
|
|
return na == NULL || (na->na_flags & NAF_ZOMBIE);
|
|
}
|
|
|
|
static inline void
|
|
nm_update_hostrings_mode(struct netmap_adapter *na)
|
|
{
|
|
/* Process nr_mode and nr_pending_mode for host rings. */
|
|
na->tx_rings[na->num_tx_rings]->nr_mode =
|
|
na->tx_rings[na->num_tx_rings]->nr_pending_mode;
|
|
na->rx_rings[na->num_rx_rings]->nr_mode =
|
|
na->rx_rings[na->num_rx_rings]->nr_pending_mode;
|
|
}
|
|
|
|
void nm_set_native_flags(struct netmap_adapter *);
|
|
void nm_clear_native_flags(struct netmap_adapter *);
|
|
|
|
void netmap_krings_mode_commit(struct netmap_adapter *na, int onoff);
|
|
|
|
/*
|
|
* nm_*sync_prologue() functions are used in ioctl/poll and ptnetmap
|
|
* kthreads.
|
|
* We need netmap_ring* parameter, because in ptnetmap it is decoupled
|
|
* from host kring.
|
|
* The user-space ring pointers (head/cur/tail) are shared through
|
|
* CSB between host and guest.
|
|
*/
|
|
|
|
/*
|
|
* validates parameters in the ring/kring, returns a value for head
|
|
* If any error, returns ring_size to force a reinit.
|
|
*/
|
|
uint32_t nm_txsync_prologue(struct netmap_kring *, struct netmap_ring *);
|
|
|
|
|
|
/*
|
|
* validates parameters in the ring/kring, returns a value for head
|
|
* If any error, returns ring_size lim to force a reinit.
|
|
*/
|
|
uint32_t nm_rxsync_prologue(struct netmap_kring *, struct netmap_ring *);
|
|
|
|
|
|
/* check/fix address and len in tx rings */
|
|
#if 1 /* debug version */
|
|
#define NM_CHECK_ADDR_LEN(_na, _a, _l) do { \
|
|
if (_a == NETMAP_BUF_BASE(_na) || _l > NETMAP_BUF_SIZE(_na)) { \
|
|
nm_prlim(5, "bad addr/len ring %d slot %d idx %d len %d", \
|
|
kring->ring_id, nm_i, slot->buf_idx, len); \
|
|
if (_l > NETMAP_BUF_SIZE(_na)) \
|
|
_l = NETMAP_BUF_SIZE(_na); \
|
|
} } while (0)
|
|
#else /* no debug version */
|
|
#define NM_CHECK_ADDR_LEN(_na, _a, _l) do { \
|
|
if (_l > NETMAP_BUF_SIZE(_na)) \
|
|
_l = NETMAP_BUF_SIZE(_na); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
/*---------------------------------------------------------------*/
|
|
/*
|
|
* Support routines used by netmap subsystems
|
|
* (native drivers, VALE, generic, pipes, monitors, ...)
|
|
*/
|
|
|
|
|
|
/* common routine for all functions that create a netmap adapter. It performs
|
|
* two main tasks:
|
|
* - if the na points to an ifp, mark the ifp as netmap capable
|
|
* using na as its native adapter;
|
|
* - provide defaults for the setup callbacks and the memory allocator
|
|
*/
|
|
int netmap_attach_common(struct netmap_adapter *);
|
|
/* fill priv->np_[tr]xq{first,last} using the ringid and flags information
|
|
* coming from a struct nmreq_register
|
|
*/
|
|
int netmap_interp_ringid(struct netmap_priv_d *priv, struct nmreq_header *hdr);
|
|
/* update the ring parameters (number and size of tx and rx rings).
|
|
* It calls the nm_config callback, if available.
|
|
*/
|
|
int netmap_update_config(struct netmap_adapter *na);
|
|
/* create and initialize the common fields of the krings array.
|
|
* using the information that must be already available in the na.
|
|
* tailroom can be used to request the allocation of additional
|
|
* tailroom bytes after the krings array. This is used by
|
|
* netmap_vp_adapter's (i.e., VALE ports) to make room for
|
|
* leasing-related data structures
|
|
*/
|
|
int netmap_krings_create(struct netmap_adapter *na, u_int tailroom);
|
|
/* deletes the kring array of the adapter. The array must have
|
|
* been created using netmap_krings_create
|
|
*/
|
|
void netmap_krings_delete(struct netmap_adapter *na);
|
|
|
|
int netmap_hw_krings_create(struct netmap_adapter *na);
|
|
void netmap_hw_krings_delete(struct netmap_adapter *na);
|
|
|
|
/* set the stopped/enabled status of ring
|
|
* When stopping, they also wait for all current activity on the ring to
|
|
* terminate. The status change is then notified using the na nm_notify
|
|
* callback.
|
|
*/
|
|
void netmap_set_ring(struct netmap_adapter *, u_int ring_id, enum txrx, int stopped);
|
|
/* set the stopped/enabled status of all rings of the adapter. */
|
|
void netmap_set_all_rings(struct netmap_adapter *, int stopped);
|
|
/* convenience wrappers for netmap_set_all_rings */
|
|
void netmap_disable_all_rings(struct ifnet *);
|
|
void netmap_enable_all_rings(struct ifnet *);
|
|
|
|
int netmap_buf_size_validate(const struct netmap_adapter *na, unsigned mtu);
|
|
int netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
|
|
struct nmreq_header *);
|
|
void netmap_do_unregif(struct netmap_priv_d *priv);
|
|
|
|
u_int nm_bound_var(u_int *v, u_int dflt, u_int lo, u_int hi, const char *msg);
|
|
int netmap_get_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct ifnet **ifp, struct netmap_mem_d *nmd, int create);
|
|
void netmap_unget_na(struct netmap_adapter *na, struct ifnet *ifp);
|
|
int netmap_get_hw_na(struct ifnet *ifp,
|
|
struct netmap_mem_d *nmd, struct netmap_adapter **na);
|
|
|
|
#ifdef WITH_VALE
|
|
uint32_t netmap_vale_learning(struct nm_bdg_fwd *ft, uint8_t *dst_ring,
|
|
struct netmap_vp_adapter *, void *private_data);
|
|
|
|
/* these are redefined in case of no VALE support */
|
|
int netmap_get_vale_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct netmap_mem_d *nmd, int create);
|
|
void *netmap_vale_create(const char *bdg_name, int *return_status);
|
|
int netmap_vale_destroy(const char *bdg_name, void *auth_token);
|
|
|
|
#else /* !WITH_VALE */
|
|
#define netmap_bdg_learning(_1, _2, _3, _4) 0
|
|
#define netmap_get_vale_na(_1, _2, _3, _4) 0
|
|
#define netmap_bdg_create(_1, _2) NULL
|
|
#define netmap_bdg_destroy(_1, _2) 0
|
|
#endif /* !WITH_VALE */
|
|
|
|
#ifdef WITH_PIPES
|
|
/* max number of pipes per device */
|
|
#define NM_MAXPIPES 64 /* XXX this should probably be a sysctl */
|
|
void netmap_pipe_dealloc(struct netmap_adapter *);
|
|
int netmap_get_pipe_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct netmap_mem_d *nmd, int create);
|
|
#else /* !WITH_PIPES */
|
|
#define NM_MAXPIPES 0
|
|
#define netmap_pipe_alloc(_1, _2) 0
|
|
#define netmap_pipe_dealloc(_1)
|
|
#define netmap_get_pipe_na(hdr, _2, _3, _4) \
|
|
((strchr(hdr->nr_name, '{') != NULL || strchr(hdr->nr_name, '}') != NULL) ? EOPNOTSUPP : 0)
|
|
#endif
|
|
|
|
#ifdef WITH_MONITOR
|
|
int netmap_get_monitor_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct netmap_mem_d *nmd, int create);
|
|
void netmap_monitor_stop(struct netmap_adapter *na);
|
|
#else
|
|
#define netmap_get_monitor_na(hdr, _2, _3, _4) \
|
|
(((struct nmreq_register *)(uintptr_t)hdr->nr_body)->nr_flags & (NR_MONITOR_TX | NR_MONITOR_RX) ? EOPNOTSUPP : 0)
|
|
#endif
|
|
|
|
#ifdef WITH_NMNULL
|
|
int netmap_get_null_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct netmap_mem_d *nmd, int create);
|
|
#else /* !WITH_NMNULL */
|
|
#define netmap_get_null_na(hdr, _2, _3, _4) \
|
|
(((struct nmreq_register *)(uintptr_t)hdr->nr_body)->nr_flags & (NR_MONITOR_TX | NR_MONITOR_RX) ? EOPNOTSUPP : 0)
|
|
#endif /* WITH_NMNULL */
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
struct net *netmap_bns_get(void);
|
|
void netmap_bns_put(struct net *);
|
|
void netmap_bns_getbridges(struct nm_bridge **, u_int *);
|
|
#else
|
|
extern struct nm_bridge *nm_bridges;
|
|
#define netmap_bns_get()
|
|
#define netmap_bns_put(_1)
|
|
#define netmap_bns_getbridges(b, n) \
|
|
do { *b = nm_bridges; *n = NM_BRIDGES; } while (0)
|
|
#endif
|
|
|
|
/* Various prototypes */
|
|
int netmap_poll(struct netmap_priv_d *, int events, NM_SELRECORD_T *td);
|
|
int netmap_init(void);
|
|
void netmap_fini(void);
|
|
int netmap_get_memory(struct netmap_priv_d* p);
|
|
void netmap_dtor(void *data);
|
|
|
|
int netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data,
|
|
struct thread *, int nr_body_is_user);
|
|
int netmap_ioctl_legacy(struct netmap_priv_d *priv, u_long cmd, caddr_t data,
|
|
struct thread *td);
|
|
size_t nmreq_size_by_type(uint16_t nr_reqtype);
|
|
|
|
/* netmap_adapter creation/destruction */
|
|
|
|
// #define NM_DEBUG_PUTGET 1
|
|
|
|
#ifdef NM_DEBUG_PUTGET
|
|
|
|
#define NM_DBG(f) __##f
|
|
|
|
void __netmap_adapter_get(struct netmap_adapter *na);
|
|
|
|
#define netmap_adapter_get(na) \
|
|
do { \
|
|
struct netmap_adapter *__na = na; \
|
|
nm_prinf("getting %p:%s (%d)", __na, (__na)->name, (__na)->na_refcount); \
|
|
__netmap_adapter_get(__na); \
|
|
} while (0)
|
|
|
|
int __netmap_adapter_put(struct netmap_adapter *na);
|
|
|
|
#define netmap_adapter_put(na) \
|
|
({ \
|
|
struct netmap_adapter *__na = na; \
|
|
nm_prinf("putting %p:%s (%d)", __na, (__na)->name, (__na)->na_refcount); \
|
|
__netmap_adapter_put(__na); \
|
|
})
|
|
|
|
#else /* !NM_DEBUG_PUTGET */
|
|
|
|
#define NM_DBG(f) f
|
|
void netmap_adapter_get(struct netmap_adapter *na);
|
|
int netmap_adapter_put(struct netmap_adapter *na);
|
|
|
|
#endif /* !NM_DEBUG_PUTGET */
|
|
|
|
|
|
/*
|
|
* module variables
|
|
*/
|
|
#define NETMAP_BUF_BASE(_na) ((_na)->na_lut.lut[0].vaddr)
|
|
#define NETMAP_BUF_SIZE(_na) ((_na)->na_lut.objsize)
|
|
extern int netmap_no_pendintr;
|
|
extern int netmap_verbose;
|
|
#ifdef CONFIG_NETMAP_DEBUG
|
|
extern int netmap_debug; /* for debugging */
|
|
#else /* !CONFIG_NETMAP_DEBUG */
|
|
#define netmap_debug (0)
|
|
#endif /* !CONFIG_NETMAP_DEBUG */
|
|
enum { /* debug flags */
|
|
NM_DEBUG_ON = 1, /* generic debug messsages */
|
|
NM_DEBUG_HOST = 0x2, /* debug host stack */
|
|
NM_DEBUG_RXSYNC = 0x10, /* debug on rxsync/txsync */
|
|
NM_DEBUG_TXSYNC = 0x20,
|
|
NM_DEBUG_RXINTR = 0x100, /* debug on rx/tx intr (driver) */
|
|
NM_DEBUG_TXINTR = 0x200,
|
|
NM_DEBUG_NIC_RXSYNC = 0x1000, /* debug on rx/tx intr (driver) */
|
|
NM_DEBUG_NIC_TXSYNC = 0x2000,
|
|
NM_DEBUG_MEM = 0x4000, /* verbose memory allocations/deallocations */
|
|
NM_DEBUG_VALE = 0x8000, /* debug messages from memory allocators */
|
|
NM_DEBUG_BDG = NM_DEBUG_VALE,
|
|
};
|
|
|
|
extern int netmap_txsync_retry;
|
|
extern int netmap_generic_hwcsum;
|
|
extern int netmap_generic_mit;
|
|
extern int netmap_generic_ringsize;
|
|
extern int netmap_generic_rings;
|
|
#ifdef linux
|
|
extern int netmap_generic_txqdisc;
|
|
#endif
|
|
|
|
/*
|
|
* NA returns a pointer to the struct netmap adapter from the ifp.
|
|
* WNA is os-specific and must be defined in glue code.
|
|
*/
|
|
#define NA(_ifp) ((struct netmap_adapter *)WNA(_ifp))
|
|
|
|
/*
|
|
* we provide a default implementation of NM_ATTACH_NA/NM_DETACH_NA
|
|
* based on the WNA field.
|
|
* Glue code may override this by defining its own NM_ATTACH_NA
|
|
*/
|
|
#ifndef NM_ATTACH_NA
|
|
/*
|
|
* On old versions of FreeBSD, NA(ifp) is a pspare. On linux we
|
|
* overload another pointer in the netdev.
|
|
*
|
|
* We check if NA(ifp) is set and its first element has a related
|
|
* magic value. The capenable is within the struct netmap_adapter.
|
|
*/
|
|
#define NETMAP_MAGIC 0x52697a7a
|
|
|
|
#define NM_NA_VALID(ifp) (NA(ifp) && \
|
|
((uint32_t)(uintptr_t)NA(ifp) ^ NA(ifp)->magic) == NETMAP_MAGIC )
|
|
|
|
#define NM_ATTACH_NA(ifp, na) do { \
|
|
WNA(ifp) = na; \
|
|
if (NA(ifp)) \
|
|
NA(ifp)->magic = \
|
|
((uint32_t)(uintptr_t)NA(ifp)) ^ NETMAP_MAGIC; \
|
|
} while(0)
|
|
#define NM_RESTORE_NA(ifp, na) WNA(ifp) = na;
|
|
|
|
#define NM_DETACH_NA(ifp) do { WNA(ifp) = NULL; } while (0)
|
|
#define NM_NA_CLASH(ifp) (NA(ifp) && !NM_NA_VALID(ifp))
|
|
#endif /* !NM_ATTACH_NA */
|
|
|
|
|
|
#define NM_IS_NATIVE(ifp) (NM_NA_VALID(ifp) && NA(ifp)->nm_dtor == netmap_hw_dtor)
|
|
|
|
#if defined(__FreeBSD__)
|
|
|
|
/* Assigns the device IOMMU domain to an allocator.
|
|
* Returns -ENOMEM in case the domain is different */
|
|
#define nm_iommu_group_id(dev) (0)
|
|
|
|
/* Callback invoked by the dma machinery after a successful dmamap_load */
|
|
static void netmap_dmamap_cb(__unused void *arg,
|
|
__unused bus_dma_segment_t * segs, __unused int nseg, __unused int error)
|
|
{
|
|
}
|
|
|
|
/* bus_dmamap_load wrapper: call aforementioned function if map != NULL.
|
|
* XXX can we do it without a callback ?
|
|
*/
|
|
static inline int
|
|
netmap_load_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
if (map)
|
|
bus_dmamap_load(tag, map, buf, NETMAP_BUF_SIZE(na),
|
|
netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
netmap_unload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map)
|
|
{
|
|
if (map)
|
|
bus_dmamap_unload(tag, map);
|
|
}
|
|
|
|
#define netmap_sync_map(na, tag, map, sz, t)
|
|
|
|
/* update the map when a buffer changes. */
|
|
static inline void
|
|
netmap_reload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
if (map) {
|
|
bus_dmamap_unload(tag, map);
|
|
bus_dmamap_load(tag, map, buf, NETMAP_BUF_SIZE(na),
|
|
netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
|
|
}
|
|
}
|
|
|
|
#elif defined(_WIN32)
|
|
|
|
#else /* linux */
|
|
|
|
int nm_iommu_group_id(bus_dma_tag_t dev);
|
|
#include <linux/dma-mapping.h>
|
|
|
|
/*
|
|
* on linux we need
|
|
* dma_map_single(&pdev->dev, virt_addr, len, direction)
|
|
* dma_unmap_single(&adapter->pdev->dev, phys_addr, len, direction)
|
|
*/
|
|
#if 0
|
|
struct e1000_buffer *buffer_info = &tx_ring->buffer_info[l];
|
|
/* set time_stamp *before* dma to help avoid a possible race */
|
|
buffer_info->time_stamp = jiffies;
|
|
buffer_info->mapped_as_page = false;
|
|
buffer_info->length = len;
|
|
//buffer_info->next_to_watch = l;
|
|
/* reload dma map */
|
|
dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
|
|
NETMAP_BUF_SIZE, DMA_TO_DEVICE);
|
|
buffer_info->dma = dma_map_single(&adapter->pdev->dev,
|
|
addr, NETMAP_BUF_SIZE, DMA_TO_DEVICE);
|
|
|
|
if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
|
|
nm_prerr("dma mapping error");
|
|
/* goto dma_error; See e1000_put_txbuf() */
|
|
/* XXX reset */
|
|
}
|
|
tx_desc->buffer_addr = htole64(buffer_info->dma); //XXX
|
|
|
|
#endif
|
|
|
|
static inline int
|
|
netmap_load_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf, u_int size)
|
|
{
|
|
if (map) {
|
|
*map = dma_map_single(na->pdev, buf, size,
|
|
DMA_BIDIRECTIONAL);
|
|
if (dma_mapping_error(na->pdev, *map)) {
|
|
*map = 0;
|
|
return ENOMEM;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
netmap_unload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, u_int sz)
|
|
{
|
|
if (*map) {
|
|
dma_unmap_single(na->pdev, *map, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
}
|
|
|
|
#ifdef NETMAP_LINUX_HAVE_DMASYNC
|
|
static inline void
|
|
netmap_sync_map_cpu(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, u_int sz, enum txrx t)
|
|
{
|
|
if (*map) {
|
|
dma_sync_single_for_cpu(na->pdev, *map, sz,
|
|
(t == NR_TX ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
netmap_sync_map_dev(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, u_int sz, enum txrx t)
|
|
{
|
|
if (*map) {
|
|
dma_sync_single_for_device(na->pdev, *map, sz,
|
|
(t == NR_TX ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
netmap_reload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
u_int sz = NETMAP_BUF_SIZE(na);
|
|
|
|
if (*map) {
|
|
dma_unmap_single(na->pdev, *map, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
*map = dma_map_single(na->pdev, buf, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
#else /* !NETMAP_LINUX_HAVE_DMASYNC */
|
|
#define netmap_sync_map_cpu(na, tag, map, sz, t)
|
|
#define netmap_sync_map_dev(na, tag, map, sz, t)
|
|
#endif /* NETMAP_LINUX_HAVE_DMASYNC */
|
|
|
|
#endif /* linux */
|
|
|
|
|
|
/*
|
|
* functions to map NIC to KRING indexes (n2k) and vice versa (k2n)
|
|
*/
|
|
static inline int
|
|
netmap_idx_n2k(struct netmap_kring *kr, int idx)
|
|
{
|
|
int n = kr->nkr_num_slots;
|
|
|
|
if (likely(kr->nkr_hwofs == 0)) {
|
|
return idx;
|
|
}
|
|
|
|
idx += kr->nkr_hwofs;
|
|
if (idx < 0)
|
|
return idx + n;
|
|
else if (idx < n)
|
|
return idx;
|
|
else
|
|
return idx - n;
|
|
}
|
|
|
|
|
|
static inline int
|
|
netmap_idx_k2n(struct netmap_kring *kr, int idx)
|
|
{
|
|
int n = kr->nkr_num_slots;
|
|
|
|
if (likely(kr->nkr_hwofs == 0)) {
|
|
return idx;
|
|
}
|
|
|
|
idx -= kr->nkr_hwofs;
|
|
if (idx < 0)
|
|
return idx + n;
|
|
else if (idx < n)
|
|
return idx;
|
|
else
|
|
return idx - n;
|
|
}
|
|
|
|
|
|
/* Entries of the look-up table. */
|
|
#ifdef __FreeBSD__
|
|
struct lut_entry {
|
|
void *vaddr; /* virtual address. */
|
|
vm_paddr_t paddr; /* physical address. */
|
|
};
|
|
#else /* linux & _WIN32 */
|
|
/* dma-mapping in linux can assign a buffer a different address
|
|
* depending on the device, so we need to have a separate
|
|
* physical-address look-up table for each na.
|
|
* We can still share the vaddrs, though, therefore we split
|
|
* the lut_entry structure.
|
|
*/
|
|
struct lut_entry {
|
|
void *vaddr; /* virtual address. */
|
|
};
|
|
|
|
struct plut_entry {
|
|
vm_paddr_t paddr; /* physical address. */
|
|
};
|
|
#endif /* linux & _WIN32 */
|
|
|
|
struct netmap_obj_pool;
|
|
|
|
/*
|
|
* NMB return the virtual address of a buffer (buffer 0 on bad index)
|
|
* PNMB also fills the physical address
|
|
*/
|
|
static inline void *
|
|
NMB(struct netmap_adapter *na, struct netmap_slot *slot)
|
|
{
|
|
struct lut_entry *lut = na->na_lut.lut;
|
|
uint32_t i = slot->buf_idx;
|
|
return (unlikely(i >= na->na_lut.objtotal)) ?
|
|
lut[0].vaddr : lut[i].vaddr;
|
|
}
|
|
|
|
static inline void *
|
|
PNMB(struct netmap_adapter *na, struct netmap_slot *slot, uint64_t *pp)
|
|
{
|
|
uint32_t i = slot->buf_idx;
|
|
struct lut_entry *lut = na->na_lut.lut;
|
|
struct plut_entry *plut = na->na_lut.plut;
|
|
void *ret = (i >= na->na_lut.objtotal) ? lut[0].vaddr : lut[i].vaddr;
|
|
|
|
#ifdef _WIN32
|
|
*pp = (i >= na->na_lut.objtotal) ? (uint64_t)plut[0].paddr.QuadPart : (uint64_t)plut[i].paddr.QuadPart;
|
|
#else
|
|
*pp = (i >= na->na_lut.objtotal) ? plut[0].paddr : plut[i].paddr;
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Structure associated to each netmap file descriptor.
|
|
* It is created on open and left unbound (np_nifp == NULL).
|
|
* A successful NIOCREGIF will set np_nifp and the first few fields;
|
|
* this is protected by a global lock (NMG_LOCK) due to low contention.
|
|
*
|
|
* np_refs counts the number of references to the structure: one for the fd,
|
|
* plus (on FreeBSD) one for each active mmap which we track ourselves
|
|
* (linux automatically tracks them, but FreeBSD does not).
|
|
* np_refs is protected by NMG_LOCK.
|
|
*
|
|
* Read access to the structure is lock free, because ni_nifp once set
|
|
* can only go to 0 when nobody is using the entry anymore. Readers
|
|
* must check that np_nifp != NULL before using the other fields.
|
|
*/
|
|
struct netmap_priv_d {
|
|
struct netmap_if * volatile np_nifp; /* netmap if descriptor. */
|
|
|
|
struct netmap_adapter *np_na;
|
|
struct ifnet *np_ifp;
|
|
uint32_t np_flags; /* from the ioctl */
|
|
u_int np_qfirst[NR_TXRX],
|
|
np_qlast[NR_TXRX]; /* range of tx/rx rings to scan */
|
|
uint16_t np_txpoll;
|
|
uint16_t np_kloop_state; /* use with NMG_LOCK held */
|
|
#define NM_SYNC_KLOOP_RUNNING (1 << 0)
|
|
#define NM_SYNC_KLOOP_STOPPING (1 << 1)
|
|
int np_sync_flags; /* to be passed to nm_sync */
|
|
|
|
int np_refs; /* use with NMG_LOCK held */
|
|
|
|
/* pointers to the selinfo to be used for selrecord.
|
|
* Either the local or the global one depending on the
|
|
* number of rings.
|
|
*/
|
|
NM_SELINFO_T *np_si[NR_TXRX];
|
|
|
|
/* In the optional CSB mode, the user must specify the start address
|
|
* of two arrays of Communication Status Block (CSB) entries, for the
|
|
* two directions (kernel read application write, and kernel write
|
|
* application read).
|
|
* The number of entries must agree with the number of rings bound to
|
|
* the netmap file descriptor. The entries corresponding to the TX
|
|
* rings are laid out before the ones corresponding to the RX rings.
|
|
*
|
|
* Array of CSB entries for application --> kernel communication
|
|
* (N entries). */
|
|
struct nm_csb_atok *np_csb_atok_base;
|
|
/* Array of CSB entries for kernel --> application communication
|
|
* (N entries). */
|
|
struct nm_csb_ktoa *np_csb_ktoa_base;
|
|
|
|
#ifdef linux
|
|
struct file *np_filp; /* used by sync kloop */
|
|
#endif /* linux */
|
|
};
|
|
|
|
struct netmap_priv_d *netmap_priv_new(void);
|
|
void netmap_priv_delete(struct netmap_priv_d *);
|
|
|
|
static inline int nm_kring_pending(struct netmap_priv_d *np)
|
|
{
|
|
struct netmap_adapter *na = np->np_na;
|
|
enum txrx t;
|
|
int i;
|
|
|
|
for_rx_tx(t) {
|
|
for (i = np->np_qfirst[t]; i < np->np_qlast[t]; i++) {
|
|
struct netmap_kring *kring = NMR(na, t)[i];
|
|
if (kring->nr_mode != kring->nr_pending_mode) {
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* call with NMG_LOCK held */
|
|
static __inline int
|
|
nm_si_user(struct netmap_priv_d *priv, enum txrx t)
|
|
{
|
|
return (priv->np_na != NULL &&
|
|
(priv->np_qlast[t] - priv->np_qfirst[t] > 1));
|
|
}
|
|
|
|
#ifdef WITH_PIPES
|
|
int netmap_pipe_txsync(struct netmap_kring *txkring, int flags);
|
|
int netmap_pipe_rxsync(struct netmap_kring *rxkring, int flags);
|
|
int netmap_pipe_krings_create_both(struct netmap_adapter *na,
|
|
struct netmap_adapter *ona);
|
|
void netmap_pipe_krings_delete_both(struct netmap_adapter *na,
|
|
struct netmap_adapter *ona);
|
|
int netmap_pipe_reg_both(struct netmap_adapter *na,
|
|
struct netmap_adapter *ona);
|
|
#endif /* WITH_PIPES */
|
|
|
|
#ifdef WITH_MONITOR
|
|
|
|
struct netmap_monitor_adapter {
|
|
struct netmap_adapter up;
|
|
|
|
struct netmap_priv_d priv;
|
|
uint32_t flags;
|
|
};
|
|
|
|
#endif /* WITH_MONITOR */
|
|
|
|
|
|
#ifdef WITH_GENERIC
|
|
/*
|
|
* generic netmap emulation for devices that do not have
|
|
* native netmap support.
|
|
*/
|
|
int generic_netmap_attach(struct ifnet *ifp);
|
|
int generic_rx_handler(struct ifnet *ifp, struct mbuf *m);;
|
|
|
|
int nm_os_catch_rx(struct netmap_generic_adapter *gna, int intercept);
|
|
int nm_os_catch_tx(struct netmap_generic_adapter *gna, int intercept);
|
|
|
|
int na_is_generic(struct netmap_adapter *na);
|
|
|
|
/*
|
|
* the generic transmit routine is passed a structure to optionally
|
|
* build a queue of descriptors, in an OS-specific way.
|
|
* The payload is at addr, if non-null, and the routine should send or queue
|
|
* the packet, returning 0 if successful, 1 on failure.
|
|
*
|
|
* At the end, if head is non-null, there will be an additional call
|
|
* to the function with addr = NULL; this should tell the OS-specific
|
|
* routine to send the queue and free any resources. Failure is ignored.
|
|
*/
|
|
struct nm_os_gen_arg {
|
|
struct ifnet *ifp;
|
|
void *m; /* os-specific mbuf-like object */
|
|
void *head, *tail; /* tailq, if the OS-specific routine needs to build one */
|
|
void *addr; /* payload of current packet */
|
|
u_int len; /* packet length */
|
|
u_int ring_nr; /* packet length */
|
|
u_int qevent; /* in txqdisc mode, place an event on this mbuf */
|
|
};
|
|
|
|
int nm_os_generic_xmit_frame(struct nm_os_gen_arg *);
|
|
int nm_os_generic_find_num_desc(struct ifnet *ifp, u_int *tx, u_int *rx);
|
|
void nm_os_generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq);
|
|
void nm_os_generic_set_features(struct netmap_generic_adapter *gna);
|
|
|
|
static inline struct ifnet*
|
|
netmap_generic_getifp(struct netmap_generic_adapter *gna)
|
|
{
|
|
if (gna->prev)
|
|
return gna->prev->ifp;
|
|
|
|
return gna->up.up.ifp;
|
|
}
|
|
|
|
void netmap_generic_irq(struct netmap_adapter *na, u_int q, u_int *work_done);
|
|
|
|
//#define RATE_GENERIC /* Enables communication statistics for generic. */
|
|
#ifdef RATE_GENERIC
|
|
void generic_rate(int txp, int txs, int txi, int rxp, int rxs, int rxi);
|
|
#else
|
|
#define generic_rate(txp, txs, txi, rxp, rxs, rxi)
|
|
#endif
|
|
|
|
/*
|
|
* netmap_mitigation API. This is used by the generic adapter
|
|
* to reduce the number of interrupt requests/selwakeup
|
|
* to clients on incoming packets.
|
|
*/
|
|
void nm_os_mitigation_init(struct nm_generic_mit *mit, int idx,
|
|
struct netmap_adapter *na);
|
|
void nm_os_mitigation_start(struct nm_generic_mit *mit);
|
|
void nm_os_mitigation_restart(struct nm_generic_mit *mit);
|
|
int nm_os_mitigation_active(struct nm_generic_mit *mit);
|
|
void nm_os_mitigation_cleanup(struct nm_generic_mit *mit);
|
|
#else /* !WITH_GENERIC */
|
|
#define generic_netmap_attach(ifp) (EOPNOTSUPP)
|
|
#define na_is_generic(na) (0)
|
|
#endif /* WITH_GENERIC */
|
|
|
|
/* Shared declarations for the VALE switch. */
|
|
|
|
/*
|
|
* Each transmit queue accumulates a batch of packets into
|
|
* a structure before forwarding. Packets to the same
|
|
* destination are put in a list using ft_next as a link field.
|
|
* ft_frags and ft_next are valid only on the first fragment.
|
|
*/
|
|
struct nm_bdg_fwd { /* forwarding entry for a bridge */
|
|
void *ft_buf; /* netmap or indirect buffer */
|
|
uint8_t ft_frags; /* how many fragments (only on 1st frag) */
|
|
uint16_t ft_offset; /* dst port (unused) */
|
|
uint16_t ft_flags; /* flags, e.g. indirect */
|
|
uint16_t ft_len; /* src fragment len */
|
|
uint16_t ft_next; /* next packet to same destination */
|
|
};
|
|
|
|
/* struct 'virtio_net_hdr' from linux. */
|
|
struct nm_vnet_hdr {
|
|
#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
|
|
#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
|
|
uint8_t flags;
|
|
#define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
|
|
#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
|
|
#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
|
|
#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
|
|
#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
|
|
uint8_t gso_type;
|
|
uint16_t hdr_len;
|
|
uint16_t gso_size;
|
|
uint16_t csum_start;
|
|
uint16_t csum_offset;
|
|
};
|
|
|
|
#define WORST_CASE_GSO_HEADER (14+40+60) /* IPv6 + TCP */
|
|
|
|
/* Private definitions for IPv4, IPv6, UDP and TCP headers. */
|
|
|
|
struct nm_iphdr {
|
|
uint8_t version_ihl;
|
|
uint8_t tos;
|
|
uint16_t tot_len;
|
|
uint16_t id;
|
|
uint16_t frag_off;
|
|
uint8_t ttl;
|
|
uint8_t protocol;
|
|
uint16_t check;
|
|
uint32_t saddr;
|
|
uint32_t daddr;
|
|
/*The options start here. */
|
|
};
|
|
|
|
struct nm_tcphdr {
|
|
uint16_t source;
|
|
uint16_t dest;
|
|
uint32_t seq;
|
|
uint32_t ack_seq;
|
|
uint8_t doff; /* Data offset + Reserved */
|
|
uint8_t flags;
|
|
uint16_t window;
|
|
uint16_t check;
|
|
uint16_t urg_ptr;
|
|
};
|
|
|
|
struct nm_udphdr {
|
|
uint16_t source;
|
|
uint16_t dest;
|
|
uint16_t len;
|
|
uint16_t check;
|
|
};
|
|
|
|
struct nm_ipv6hdr {
|
|
uint8_t priority_version;
|
|
uint8_t flow_lbl[3];
|
|
|
|
uint16_t payload_len;
|
|
uint8_t nexthdr;
|
|
uint8_t hop_limit;
|
|
|
|
uint8_t saddr[16];
|
|
uint8_t daddr[16];
|
|
};
|
|
|
|
/* Type used to store a checksum (in host byte order) that hasn't been
|
|
* folded yet.
|
|
*/
|
|
#define rawsum_t uint32_t
|
|
|
|
rawsum_t nm_os_csum_raw(uint8_t *data, size_t len, rawsum_t cur_sum);
|
|
uint16_t nm_os_csum_ipv4(struct nm_iphdr *iph);
|
|
void nm_os_csum_tcpudp_ipv4(struct nm_iphdr *iph, void *data,
|
|
size_t datalen, uint16_t *check);
|
|
void nm_os_csum_tcpudp_ipv6(struct nm_ipv6hdr *ip6h, void *data,
|
|
size_t datalen, uint16_t *check);
|
|
uint16_t nm_os_csum_fold(rawsum_t cur_sum);
|
|
|
|
void bdg_mismatch_datapath(struct netmap_vp_adapter *na,
|
|
struct netmap_vp_adapter *dst_na,
|
|
const struct nm_bdg_fwd *ft_p,
|
|
struct netmap_ring *dst_ring,
|
|
u_int *j, u_int lim, u_int *howmany);
|
|
|
|
/* persistent virtual port routines */
|
|
int nm_os_vi_persist(const char *, struct ifnet **);
|
|
void nm_os_vi_detach(struct ifnet *);
|
|
void nm_os_vi_init_index(void);
|
|
|
|
/*
|
|
* kernel thread routines
|
|
*/
|
|
struct nm_kctx; /* OS-specific kernel context - opaque */
|
|
typedef void (*nm_kctx_worker_fn_t)(void *data);
|
|
|
|
/* kthread configuration */
|
|
struct nm_kctx_cfg {
|
|
long type; /* kthread type/identifier */
|
|
nm_kctx_worker_fn_t worker_fn; /* worker function */
|
|
void *worker_private;/* worker parameter */
|
|
int attach_user; /* attach kthread to user process */
|
|
};
|
|
/* kthread configuration */
|
|
struct nm_kctx *nm_os_kctx_create(struct nm_kctx_cfg *cfg,
|
|
void *opaque);
|
|
int nm_os_kctx_worker_start(struct nm_kctx *);
|
|
void nm_os_kctx_worker_stop(struct nm_kctx *);
|
|
void nm_os_kctx_destroy(struct nm_kctx *);
|
|
void nm_os_kctx_worker_setaff(struct nm_kctx *, int);
|
|
u_int nm_os_ncpus(void);
|
|
|
|
int netmap_sync_kloop(struct netmap_priv_d *priv,
|
|
struct nmreq_header *hdr);
|
|
int netmap_sync_kloop_stop(struct netmap_priv_d *priv);
|
|
|
|
#ifdef WITH_PTNETMAP
|
|
/* ptnetmap guest routines */
|
|
|
|
/*
|
|
* ptnetmap_memdev routines used to talk with ptnetmap_memdev device driver
|
|
*/
|
|
struct ptnetmap_memdev;
|
|
int nm_os_pt_memdev_iomap(struct ptnetmap_memdev *, vm_paddr_t *, void **,
|
|
uint64_t *);
|
|
void nm_os_pt_memdev_iounmap(struct ptnetmap_memdev *);
|
|
uint32_t nm_os_pt_memdev_ioread(struct ptnetmap_memdev *, unsigned int);
|
|
|
|
/*
|
|
* netmap adapter for guest ptnetmap ports
|
|
*/
|
|
struct netmap_pt_guest_adapter {
|
|
/* The netmap adapter to be used by netmap applications.
|
|
* This field must be the first, to allow upcast. */
|
|
struct netmap_hw_adapter hwup;
|
|
|
|
/* The netmap adapter to be used by the driver. */
|
|
struct netmap_hw_adapter dr;
|
|
|
|
/* Reference counter to track users of backend netmap port: the
|
|
* network stack and netmap clients.
|
|
* Used to decide when we need (de)allocate krings/rings and
|
|
* start (stop) ptnetmap kthreads. */
|
|
int backend_users;
|
|
|
|
};
|
|
|
|
int netmap_pt_guest_attach(struct netmap_adapter *na,
|
|
unsigned int nifp_offset,
|
|
unsigned int memid);
|
|
bool netmap_pt_guest_txsync(struct nm_csb_atok *atok,
|
|
struct nm_csb_ktoa *ktoa,
|
|
struct netmap_kring *kring, int flags);
|
|
bool netmap_pt_guest_rxsync(struct nm_csb_atok *atok,
|
|
struct nm_csb_ktoa *ktoa,
|
|
struct netmap_kring *kring, int flags);
|
|
int ptnet_nm_krings_create(struct netmap_adapter *na);
|
|
void ptnet_nm_krings_delete(struct netmap_adapter *na);
|
|
void ptnet_nm_dtor(struct netmap_adapter *na);
|
|
|
|
/* Helper function wrapping nm_sync_kloop_appl_read(). */
|
|
static inline void
|
|
ptnet_sync_tail(struct nm_csb_ktoa *ktoa, struct netmap_kring *kring)
|
|
{
|
|
struct netmap_ring *ring = kring->ring;
|
|
|
|
/* Update hwcur and hwtail as known by the host. */
|
|
nm_sync_kloop_appl_read(ktoa, &kring->nr_hwtail, &kring->nr_hwcur);
|
|
|
|
/* nm_sync_finalize */
|
|
ring->tail = kring->rtail = kring->nr_hwtail;
|
|
}
|
|
#endif /* WITH_PTNETMAP */
|
|
|
|
#ifdef __FreeBSD__
|
|
/*
|
|
* FreeBSD mbuf allocator/deallocator in emulation mode:
|
|
*/
|
|
#if __FreeBSD_version < 1100000
|
|
|
|
/*
|
|
* For older versions of FreeBSD:
|
|
*
|
|
* We allocate EXT_PACKET mbuf+clusters, but need to set M_NOFREE
|
|
* so that the destructor, if invoked, will not free the packet.
|
|
* In principle we should set the destructor only on demand,
|
|
* but since there might be a race we better do it on allocation.
|
|
* As a consequence, we also need to set the destructor or we
|
|
* would leak buffers.
|
|
*/
|
|
|
|
/* mbuf destructor, also need to change the type to EXT_EXTREF,
|
|
* add an M_NOFREE flag, and then clear the flag and
|
|
* chain into uma_zfree(zone_pack, mf)
|
|
* (or reinstall the buffer ?)
|
|
*/
|
|
#define SET_MBUF_DESTRUCTOR(m, fn) do { \
|
|
(m)->m_ext.ext_free = (void *)fn; \
|
|
(m)->m_ext.ext_type = EXT_EXTREF; \
|
|
} while (0)
|
|
|
|
static int
|
|
void_mbuf_dtor(struct mbuf *m, void *arg1, void *arg2)
|
|
{
|
|
/* restore original mbuf */
|
|
m->m_ext.ext_buf = m->m_data = m->m_ext.ext_arg1;
|
|
m->m_ext.ext_arg1 = NULL;
|
|
m->m_ext.ext_type = EXT_PACKET;
|
|
m->m_ext.ext_free = NULL;
|
|
if (MBUF_REFCNT(m) == 0)
|
|
SET_MBUF_REFCNT(m, 1);
|
|
uma_zfree(zone_pack, m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline struct mbuf *
|
|
nm_os_get_mbuf(struct ifnet *ifp, int len)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
(void)ifp;
|
|
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
if (m) {
|
|
/* m_getcl() (mb_ctor_mbuf) has an assert that checks that
|
|
* M_NOFREE flag is not specified as third argument,
|
|
* so we have to set M_NOFREE after m_getcl(). */
|
|
m->m_flags |= M_NOFREE;
|
|
m->m_ext.ext_arg1 = m->m_ext.ext_buf; // XXX save
|
|
m->m_ext.ext_free = (void *)void_mbuf_dtor;
|
|
m->m_ext.ext_type = EXT_EXTREF;
|
|
nm_prdis(5, "create m %p refcnt %d", m, MBUF_REFCNT(m));
|
|
}
|
|
return m;
|
|
}
|
|
|
|
#else /* __FreeBSD_version >= 1100000 */
|
|
|
|
/*
|
|
* Newer versions of FreeBSD, using a straightforward scheme.
|
|
*
|
|
* We allocate mbufs with m_gethdr(), since the mbuf header is needed
|
|
* by the driver. We also attach a customly-provided external storage,
|
|
* which in this case is a netmap buffer. When calling m_extadd(), however
|
|
* we pass a NULL address, since the real address (and length) will be
|
|
* filled in by nm_os_generic_xmit_frame() right before calling
|
|
* if_transmit().
|
|
*
|
|
* The dtor function does nothing, however we need it since mb_free_ext()
|
|
* has a KASSERT(), checking that the mbuf dtor function is not NULL.
|
|
*/
|
|
|
|
#if __FreeBSD_version <= 1200050
|
|
static void void_mbuf_dtor(struct mbuf *m, void *arg1, void *arg2) { }
|
|
#else /* __FreeBSD_version >= 1200051 */
|
|
/* The arg1 and arg2 pointers argument were removed by r324446, which
|
|
* in included since version 1200051. */
|
|
static void void_mbuf_dtor(struct mbuf *m) { }
|
|
#endif /* __FreeBSD_version >= 1200051 */
|
|
|
|
#define SET_MBUF_DESTRUCTOR(m, fn) do { \
|
|
(m)->m_ext.ext_free = (fn != NULL) ? \
|
|
(void *)fn : (void *)void_mbuf_dtor; \
|
|
} while (0)
|
|
|
|
static inline struct mbuf *
|
|
nm_os_get_mbuf(struct ifnet *ifp, int len)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
(void)ifp;
|
|
(void)len;
|
|
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
return m;
|
|
}
|
|
|
|
m_extadd(m, NULL /* buf */, 0 /* size */, void_mbuf_dtor,
|
|
NULL, NULL, 0, EXT_NET_DRV);
|
|
|
|
return m;
|
|
}
|
|
|
|
#endif /* __FreeBSD_version >= 1100000 */
|
|
#endif /* __FreeBSD__ */
|
|
|
|
struct nmreq_option * nmreq_getoption(struct nmreq_header *, uint16_t);
|
|
|
|
int netmap_init_bridges(void);
|
|
void netmap_uninit_bridges(void);
|
|
|
|
/* Functions to read and write CSB fields from the kernel. */
|
|
#if defined (linux)
|
|
#define CSB_READ(csb, field, r) (get_user(r, &csb->field))
|
|
#define CSB_WRITE(csb, field, v) (put_user(v, &csb->field))
|
|
#else /* ! linux */
|
|
#define CSB_READ(csb, field, r) (r = fuword32(&csb->field))
|
|
#define CSB_WRITE(csb, field, v) (suword32(&csb->field, v))
|
|
#endif /* ! linux */
|
|
|
|
#endif /* _NET_NETMAP_KERN_H_ */
|