87de0cd185
netmap_kern.h currently requires all drivers including it to include selinfo.h. Submitted by: mmacy@nextbsd.org Reviewed by: gnn MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D5334
1678 lines
51 KiB
C
1678 lines
51 KiB
C
/*
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* Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
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* Copyright (C) 2013-2014 Universita` di Pisa. 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_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_V1000)
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#define WITH_V1000
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#endif
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#else /* not linux */
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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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#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 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_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 MBUF_LEN(m) ((m)->m_pkthdr.len)
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#define MBUF_IFP(m) ((m)->m_pkthdr.rcvif)
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#define NM_SEND_UP(ifp, m) ((NA(ifp))->if_input)(ifp, m)
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#define NM_ATOMIC_T volatile int // XXX ?
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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 GET_MBUF_REFCNT(m) ((m)->m_ext.ext_cnt ? *((m)->m_ext.ext_cnt) : -1)
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#define SET_MBUF_REFCNT(m, x) *((m)->m_ext.ext_cnt) = x
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#define PNT_MBUF_REFCNT(m) ((m)->m_ext.ext_cnt)
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#else
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#define GET_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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#define PNT_MBUF_REFCNT(m) ((m)->m_ext.ref_cnt)
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#endif
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MALLOC_DECLARE(M_NETMAP);
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struct nm_selinfo {
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struct selinfo si;
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struct mtx m;
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};
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void freebsd_selwakeup(struct nm_selinfo *si, int pri);
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// XXX linux struct, not used in FreeBSD
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struct net_device_ops {
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};
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struct ethtool_ops {
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};
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struct hrtimer {
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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_IFP(m) ((m)->dev)
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#define NM_SEND_UP(ifp, m) \
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do { \
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m->priority = NM_MAGIC_PRIORITY_RX; \
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netif_rx(m); \
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} while (0)
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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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#define NM_SEND_UP(ifp, m) ((ifp)->if_input)(ifp, m)
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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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#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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#define ND(format, ...)
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#define D(format, ...) \
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do { \
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struct timeval __xxts; \
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microtime(&__xxts); \
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printf("%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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/* rate limited, lps indicates how many per second */
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#define RD(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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D(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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const char *nm_dump_buf(char *p, int len, int lim, char *dst);
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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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/*
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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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* For received packets, slot->flags is set to nkr_slot_flags
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* so we can provide a proper initial value (e.g. set NS_FORWARD
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* when operating in 'transparent' mode).
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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;
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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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uint32_t nkr_num_slots;
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/*
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* On a NIC reset, the NIC ring indexes may be reset but the
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* indexes in the netmap rings remain the same. nkr_hwofs
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* keeps track of the offset between the two.
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*/
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int32_t nkr_hwofs;
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uint16_t nkr_slot_flags; /* initial value for flags */
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/* last_reclaim is opaque marker to help reduce the frequency
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* of operations such as reclaiming tx buffers. A possible use
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* is set it to ticks and do the reclaim only once per tick.
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*/
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uint64_t last_reclaim;
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NM_SELINFO_T si; /* poll/select wait queue */
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NM_LOCK_T q_lock; /* protects kring and ring. */
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NM_ATOMIC_T nr_busy; /* prevent concurrent syscalls */
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struct netmap_adapter *na;
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/* The following fields are for VALE switch support */
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struct nm_bdg_fwd *nkr_ft;
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uint32_t *nkr_leases;
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#define NR_NOSLOT ((uint32_t)~0) /* used in nkr_*lease* */
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uint32_t nkr_hwlease;
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uint32_t nkr_lease_idx;
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/* while nkr_stopped is set, no new [tr]xsync operations can
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* be started on this kring.
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* This is used by netmap_disable_all_rings()
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* to find a synchronization point where critical data
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* structures pointed to by the kring can be added or removed
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*/
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volatile int nkr_stopped;
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/* Support for adapters without native netmap support.
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* On tx rings we preallocate an array of tx buffers
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* (same size as the netmap ring), on rx rings we
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* store incoming mbufs in a queue that is drained by
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* a rxsync.
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*/
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struct mbuf **tx_pool;
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// u_int nr_ntc; /* Emulation of a next-to-clean RX ring pointer. */
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struct mbq rx_queue; /* intercepted rx mbufs. */
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uint32_t users; /* existing bindings for this ring */
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uint32_t ring_id; /* debugging */
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enum txrx tx; /* kind of ring (tx or rx) */
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char name[64]; /* diagnostic */
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/* [tx]sync callback for this kring.
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* The default nm_kring_create callback (netmap_krings_create)
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* sets the nm_sync callback of each hardware tx(rx) kring to
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* the corresponding nm_txsync(nm_rxsync) taken from the
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* netmap_adapter; moreover, it sets the sync callback
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* of the host tx(rx) ring to netmap_txsync_to_host
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* (netmap_rxsync_from_host).
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*
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* Overrides: the above configuration is not changed by
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* any of the nm_krings_create callbacks.
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*/
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int (*nm_sync)(struct netmap_kring *kring, int flags);
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int (*nm_notify)(struct netmap_kring *kring, int flags);
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#ifdef WITH_PIPES
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struct netmap_kring *pipe; /* if this is a pipe ring,
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* pointer to the other end
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*/
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struct netmap_ring *save_ring; /* pointer to hidden rings
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* (see netmap_pipe.c for details)
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*/
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#endif /* WITH_PIPES */
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#ifdef WITH_VALE
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int (*save_notify)(struct netmap_kring *kring, int flags);
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#endif
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#ifdef WITH_MONITOR
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/* array of krings that are monitoring this kring */
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struct netmap_kring **monitors;
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uint32_t max_monitors; /* current size of the monitors array */
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uint32_t n_monitors; /* next unused entry in the monitor array */
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/*
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* Monitors work by intercepting the sync and notify callbacks of the
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* monitored krings. This is implemented by replacing the pointers
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* above and saving the previous ones in mon_* pointers below
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*/
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int (*mon_sync)(struct netmap_kring *kring, int flags);
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int (*mon_notify)(struct netmap_kring *kring, int flags);
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uint32_t mon_tail; /* last seen slot on rx */
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uint32_t mon_pos; /* index of this ring in the monitored ring array */
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#endif
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} __attribute__((__aligned__(64)));
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/* return the next index, with wraparound */
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static inline uint32_t
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nm_next(uint32_t i, uint32_t lim)
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{
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return unlikely (i == lim) ? 0 : i + 1;
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}
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/* return the previous index, with wraparound */
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static inline uint32_t
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nm_prev(uint32_t i, uint32_t lim)
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{
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return unlikely (i == 0) ? lim : i - 1;
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}
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/*
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*
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* Here is the layout for the Rx and Tx rings.
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RxRING TxRING
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+-----------------+ +-----------------+
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| | | |
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|XXX free slot XXX| |XXX free slot XXX|
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+-----------------+ +-----------------+
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head->| owned by user |<-hwcur | not sent to nic |<-hwcur
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| | | yet |
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+-----------------+ | |
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cur->| available to | | |
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| user, not read | +-----------------+
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| yet | cur->| (being |
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| | | prepared) |
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| | | |
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+-----------------+ + ------ +
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tail->| |<-hwtail | |<-hwlease
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| (being | ... | | ...
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| prepared) | ... | | ...
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+-----------------+ ... | | ...
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| |<-hwlease +-----------------+
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| | tail->| |<-hwtail
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| | | |
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| | | |
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| | | |
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+-----------------+ +-----------------+
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* The cur/tail (user view) and hwcur/hwtail (kernel view)
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* are used in the normal operation of the card.
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*
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* When a ring is the output of a switch port (Rx ring for
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* a VALE port, Tx ring for the host stack or NIC), slots
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* are reserved in blocks through 'hwlease' which points
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* to the next unused slot.
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* On an Rx ring, hwlease is always after hwtail,
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* and completions cause hwtail to advance.
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* On a Tx ring, hwlease is always between cur and hwtail,
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* and completions cause cur to advance.
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*
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* nm_kr_space() returns the maximum number of slots that
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* can be assigned.
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* nm_kr_lease() reserves the required number of buffers,
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* advances nkr_hwlease and also returns an entry in
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* a circular array where completions should be reported.
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*/
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struct netmap_lut {
|
|
struct lut_entry *lut;
|
|
uint32_t objtotal; /* max buffer index */
|
|
uint32_t objsize; /* buffer size */
|
|
};
|
|
|
|
struct netmap_vp_adapter; // forward
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
uint32_t 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 */
|
|
#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_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+1 entries, for the adapter queues and for the host queue.
|
|
*/
|
|
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 *);
|
|
|
|
/* references to the ifnet and device routines, used by
|
|
* the generic netmap functions.
|
|
*/
|
|
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.
|
|
*/
|
|
void (*nm_dtor)(struct netmap_adapter *);
|
|
|
|
int (*nm_register)(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
|
|
/* return configuration information */
|
|
int (*nm_config)(struct netmap_adapter *,
|
|
u_int *txr, u_int *txd, u_int *rxr, u_int *rxd);
|
|
int (*nm_krings_create)(struct netmap_adapter *);
|
|
void (*nm_krings_delete)(struct netmap_adapter *);
|
|
#ifdef WITH_VALE
|
|
/*
|
|
* 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 *);
|
|
int (*nm_bdg_ctl)(struct netmap_adapter *, struct nmreq *, int);
|
|
|
|
/* 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;
|
|
#endif
|
|
|
|
/* 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, and the total number of buffers.
|
|
*/
|
|
struct netmap_mem_d *nm_mem;
|
|
struct netmap_lut na_lut;
|
|
|
|
/* additional information attached to this adapter
|
|
* by other netmap subsystems. Currently used by
|
|
* bwrap and LINUX/v1000.
|
|
*/
|
|
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 */
|
|
|
|
char name[64];
|
|
};
|
|
|
|
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 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 struct netmap_kring*
|
|
NMR(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return (t == NR_TX ? na->tx_rings : na->rx_rings);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/* Offset of ethernet header for each packet. */
|
|
u_int virt_hdr_len;
|
|
/* 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;
|
|
|
|
struct net_device_ops nm_ndo; // XXX linux only
|
|
struct ethtool_ops nm_eto; // XXX linux only
|
|
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;
|
|
|
|
/* generic netmap adapters support:
|
|
* a net_device_ops struct overrides ndo_select_queue(),
|
|
* save_if_input saves the if_input hook (FreeBSD),
|
|
* mit implements rx interrupt mitigation,
|
|
*/
|
|
struct net_device_ops generic_ndo;
|
|
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
|
|
};
|
|
#endif /* WITH_GENERIC */
|
|
|
|
static __inline int
|
|
netmap_real_rings(struct netmap_adapter *na, enum txrx t)
|
|
{
|
|
return nma_get_nrings(na, t) + !!(na->na_flags & NAF_HOST_RINGS);
|
|
}
|
|
|
|
#ifdef WITH_VALE
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
/* backup of the hwna memory allocator */
|
|
struct netmap_mem_d *save_nmd;
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
int netmap_bwrap_attach(const char *name, struct netmap_adapter *);
|
|
|
|
|
|
#endif /* WITH_VALE */
|
|
|
|
#ifdef WITH_PIPES
|
|
|
|
#define NM_MAXPIPES 64 /* max number of pipes per adapter */
|
|
|
|
struct netmap_pipe_adapter {
|
|
struct netmap_adapter up;
|
|
|
|
u_int id; /* pipe identifier */
|
|
int role; /* either NR_REG_PIPE_MASTER or NR_REG_PIPE_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 */
|
|
|
|
u_int parent_slot; /* index in the parent pipe array */
|
|
};
|
|
|
|
#endif /* WITH_PIPES */
|
|
|
|
|
|
/* 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;
|
|
ND("preserving %d rx slots %d -> %d", space, k->nr_hwcur, k->nr_hwtail);
|
|
|
|
return space;
|
|
}
|
|
|
|
|
|
/* 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->rcur == kring->nr_hwtail;
|
|
}
|
|
|
|
|
|
/*
|
|
* protect against multiple threads using the same ring.
|
|
* also check that the ring has not been stopped.
|
|
* We only care for 0 or !=0 as a return code.
|
|
*/
|
|
#define NM_KR_BUSY 1
|
|
#define NM_KR_STOPPED 2
|
|
|
|
|
|
static __inline void nm_kr_put(struct netmap_kring *kr)
|
|
{
|
|
NM_ATOMIC_CLEAR(&kr->nr_busy);
|
|
}
|
|
|
|
|
|
static __inline int nm_kr_tryget(struct netmap_kring *kr)
|
|
{
|
|
/* check a first time without taking the lock
|
|
* to avoid starvation for nm_kr_get()
|
|
*/
|
|
if (unlikely(kr->nkr_stopped)) {
|
|
ND("ring %p stopped (%d)", kr, kr->nkr_stopped);
|
|
return NM_KR_STOPPED;
|
|
}
|
|
if (unlikely(NM_ATOMIC_TEST_AND_SET(&kr->nr_busy)))
|
|
return NM_KR_BUSY;
|
|
/* check a second time with lock held */
|
|
if (unlikely(kr->nkr_stopped)) {
|
|
ND("ring %p stopped (%d)", kr, kr->nkr_stopped);
|
|
nm_kr_put(kr);
|
|
return NM_KR_STOPPED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __inline void nm_kr_get(struct netmap_kring *kr)
|
|
{
|
|
while (NM_ATOMIC_TEST_AND_SET(&kr->nr_busy))
|
|
tsleep(kr, 0, "NM_KR_GET", 4);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 *);
|
|
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 *);
|
|
|
|
/* 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)
|
|
void netmap_common_irq(struct ifnet *, 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
|
|
#define netmap_bdg_name(_vp) NULL
|
|
#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);
|
|
}
|
|
|
|
/* set/clear native flags and if_transmit/netdev_ops */
|
|
static inline void
|
|
nm_set_native_flags(struct netmap_adapter *na)
|
|
{
|
|
struct ifnet *ifp = na->ifp;
|
|
|
|
na->na_flags |= NAF_NETMAP_ON;
|
|
#ifdef IFCAP_NETMAP /* or FreeBSD ? */
|
|
ifp->if_capenable |= IFCAP_NETMAP;
|
|
#endif
|
|
#ifdef __FreeBSD__
|
|
na->if_transmit = ifp->if_transmit;
|
|
ifp->if_transmit = netmap_transmit;
|
|
#else
|
|
na->if_transmit = (void *)ifp->netdev_ops;
|
|
ifp->netdev_ops = &((struct netmap_hw_adapter *)na)->nm_ndo;
|
|
((struct netmap_hw_adapter *)na)->save_ethtool = ifp->ethtool_ops;
|
|
ifp->ethtool_ops = &((struct netmap_hw_adapter*)na)->nm_eto;
|
|
#endif
|
|
}
|
|
|
|
|
|
static inline void
|
|
nm_clear_native_flags(struct netmap_adapter *na)
|
|
{
|
|
struct ifnet *ifp = na->ifp;
|
|
|
|
#ifdef __FreeBSD__
|
|
ifp->if_transmit = na->if_transmit;
|
|
#else
|
|
ifp->netdev_ops = (void *)na->if_transmit;
|
|
ifp->ethtool_ops = ((struct netmap_hw_adapter*)na)->save_ethtool;
|
|
#endif
|
|
na->na_flags &= ~NAF_NETMAP_ON;
|
|
#ifdef IFCAP_NETMAP /* or FreeBSD ? */
|
|
ifp->if_capenable &= ~IFCAP_NETMAP;
|
|
#endif
|
|
}
|
|
|
|
|
|
/* 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)) { \
|
|
RD(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 *);
|
|
/* common actions to be performed on netmap adapter destruction */
|
|
void netmap_detach_common(struct netmap_adapter *);
|
|
/* fill priv->np_[tr]xq{first,last} using the ringid and flags information
|
|
* coming from a struct nmreq
|
|
*/
|
|
int netmap_interp_ringid(struct netmap_priv_d *priv, uint16_t ringid, uint32_t flags);
|
|
/* 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);
|
|
|
|
/* 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, used in drivers */
|
|
void netmap_disable_all_rings(struct ifnet *);
|
|
void netmap_enable_all_rings(struct ifnet *);
|
|
|
|
int netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
|
|
uint16_t ringid, uint32_t flags);
|
|
|
|
|
|
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 *nmr, struct netmap_adapter **na, int create);
|
|
int netmap_get_hw_na(struct ifnet *ifp, struct netmap_adapter **na);
|
|
|
|
|
|
#ifdef WITH_VALE
|
|
/*
|
|
* The following bridge-related functions are used by other
|
|
* kernel modules.
|
|
*
|
|
* VALE only supports unicast or broadcast. The lookup
|
|
* function can return 0 .. NM_BDG_MAXPORTS-1 for regular ports,
|
|
* NM_BDG_MAXPORTS for broadcast, NM_BDG_MAXPORTS+1 for unknown.
|
|
* XXX in practice "unknown" might be handled same as broadcast.
|
|
*/
|
|
typedef u_int (*bdg_lookup_fn_t)(struct nm_bdg_fwd *ft, uint8_t *ring_nr,
|
|
struct netmap_vp_adapter *);
|
|
typedef int (*bdg_config_fn_t)(struct nm_ifreq *);
|
|
typedef void (*bdg_dtor_fn_t)(const struct netmap_vp_adapter *);
|
|
struct netmap_bdg_ops {
|
|
bdg_lookup_fn_t lookup;
|
|
bdg_config_fn_t config;
|
|
bdg_dtor_fn_t dtor;
|
|
};
|
|
|
|
u_int netmap_bdg_learning(struct nm_bdg_fwd *ft, uint8_t *dst_ring,
|
|
struct netmap_vp_adapter *);
|
|
|
|
#define NM_BDG_MAXPORTS 254 /* up to 254 */
|
|
#define NM_BDG_BROADCAST NM_BDG_MAXPORTS
|
|
#define NM_BDG_NOPORT (NM_BDG_MAXPORTS+1)
|
|
|
|
#define NM_NAME "vale" /* prefix for bridge port name */
|
|
|
|
/* these are redefined in case of no VALE support */
|
|
int netmap_get_bdg_na(struct nmreq *nmr, struct netmap_adapter **na, int create);
|
|
struct nm_bridge *netmap_init_bridges2(u_int);
|
|
void netmap_uninit_bridges2(struct nm_bridge *, u_int);
|
|
int netmap_init_bridges(void);
|
|
void netmap_uninit_bridges(void);
|
|
int netmap_bdg_ctl(struct nmreq *nmr, struct netmap_bdg_ops *bdg_ops);
|
|
int netmap_bdg_config(struct nmreq *nmr);
|
|
|
|
#else /* !WITH_VALE */
|
|
#define netmap_get_bdg_na(_1, _2, _3) 0
|
|
#define netmap_init_bridges(_1) 0
|
|
#define netmap_uninit_bridges()
|
|
#define netmap_bdg_ctl(_1, _2) EINVAL
|
|
#endif /* !WITH_VALE */
|
|
|
|
#ifdef WITH_PIPES
|
|
/* max number of pipes per device */
|
|
#define NM_MAXPIPES 64 /* XXX how many? */
|
|
void netmap_pipe_dealloc(struct netmap_adapter *);
|
|
int netmap_get_pipe_na(struct nmreq *nmr, struct netmap_adapter **na, 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(nmr, _2, _3) \
|
|
({ int role__ = (nmr)->nr_flags & NR_REG_MASK; \
|
|
(role__ == NR_REG_PIPE_MASTER || \
|
|
role__ == NR_REG_PIPE_SLAVE) ? EOPNOTSUPP : 0; })
|
|
#endif
|
|
|
|
#ifdef WITH_MONITOR
|
|
int netmap_get_monitor_na(struct nmreq *nmr, struct netmap_adapter **na, int create);
|
|
void netmap_monitor_stop(struct netmap_adapter *na);
|
|
#else
|
|
#define netmap_get_monitor_na(nmr, _2, _3) \
|
|
((nmr)->nr_flags & (NR_MONITOR_TX | NR_MONITOR_RX) ? EOPNOTSUPP : 0)
|
|
#endif
|
|
|
|
#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
|
|
#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 cdev *dev, int events, struct thread *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_dtor_locked(struct netmap_priv_d *priv);
|
|
|
|
int netmap_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td);
|
|
|
|
/* 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; \
|
|
D("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; \
|
|
D("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_mitigate; // XXX not really used
|
|
extern int netmap_no_pendintr;
|
|
extern int netmap_verbose; // XXX debugging
|
|
enum { /* verbose flags */
|
|
NM_VERB_ON = 1, /* generic verbose */
|
|
NM_VERB_HOST = 0x2, /* verbose host stack */
|
|
NM_VERB_RXSYNC = 0x10, /* verbose on rxsync/txsync */
|
|
NM_VERB_TXSYNC = 0x20,
|
|
NM_VERB_RXINTR = 0x100, /* verbose on rx/tx intr (driver) */
|
|
NM_VERB_TXINTR = 0x200,
|
|
NM_VERB_NIC_RXSYNC = 0x1000, /* verbose on rx/tx intr (driver) */
|
|
NM_VERB_NIC_TXSYNC = 0x2000,
|
|
};
|
|
|
|
extern int netmap_txsync_retry;
|
|
extern int netmap_generic_mit;
|
|
extern int netmap_generic_ringsize;
|
|
extern int netmap_generic_rings;
|
|
extern int netmap_use_count;
|
|
|
|
/*
|
|
* NA returns a pointer to the struct netmap adapter from the ifp,
|
|
* WNA is used to write it.
|
|
*/
|
|
#define NA(_ifp) ((struct netmap_adapter *)WNA(_ifp))
|
|
|
|
/*
|
|
* Macros to determine if an interface is netmap capable or netmap enabled.
|
|
* See the magic field in struct netmap_adapter.
|
|
*/
|
|
#ifdef __FreeBSD__
|
|
/*
|
|
* on FreeBSD just use if_capabilities and if_capenable.
|
|
*/
|
|
#define NETMAP_CAPABLE(ifp) (NA(ifp) && \
|
|
(ifp)->if_capabilities & IFCAP_NETMAP )
|
|
|
|
#define NETMAP_SET_CAPABLE(ifp) \
|
|
(ifp)->if_capabilities |= IFCAP_NETMAP
|
|
|
|
#else /* linux */
|
|
|
|
/*
|
|
* on linux:
|
|
* 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 NETMAP_CAPABLE(ifp) (NA(ifp) && \
|
|
((uint32_t)(uintptr_t)NA(ifp) ^ NA(ifp)->magic) == NETMAP_MAGIC )
|
|
|
|
#define NETMAP_SET_CAPABLE(ifp) \
|
|
NA(ifp)->magic = ((uint32_t)(uintptr_t)NA(ifp)) ^ NETMAP_MAGIC
|
|
|
|
#endif /* linux */
|
|
|
|
#ifdef __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 void
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
}
|
|
|
|
#else /* linux */
|
|
|
|
int nm_iommu_group_id(bus_dma_tag_t dev);
|
|
#include <linux/dma-mapping.h>
|
|
|
|
static inline void
|
|
netmap_load_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
if (0 && map) {
|
|
*map = dma_map_single(na->pdev, buf, na->na_lut.objsize,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
netmap_unload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map)
|
|
{
|
|
u_int sz = na->na_lut.objsize;
|
|
|
|
if (*map) {
|
|
dma_unmap_single(na->pdev, *map, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
netmap_reload_map(struct netmap_adapter *na,
|
|
bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
u_int sz = na->na_lut.objsize;
|
|
|
|
if (*map) {
|
|
dma_unmap_single(na->pdev, *map, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
*map = dma_map_single(na->pdev, buf, sz,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
/*
|
|
* XXX How do we redefine these functions:
|
|
*
|
|
* on linux we need
|
|
* dma_map_single(&pdev->dev, virt_addr, len, direction)
|
|
* dma_unmap_single(&adapter->pdev->dev, phys_addr, len, direction
|
|
* The len can be implicit (on netmap it is NETMAP_BUF_SIZE)
|
|
* unfortunately the direction is not, so we need to change
|
|
* something to have a cross API
|
|
*/
|
|
|
|
#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)) {
|
|
D("dma mapping error");
|
|
/* goto dma_error; See e1000_put_txbuf() */
|
|
/* XXX reset */
|
|
}
|
|
tx_desc->buffer_addr = htole64(buffer_info->dma); //XXX
|
|
|
|
#endif
|
|
|
|
/*
|
|
* The bus_dmamap_sync() can be one of wmb() or rmb() depending on direction.
|
|
*/
|
|
#define bus_dmamap_sync(_a, _b, _c)
|
|
|
|
#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;
|
|
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;
|
|
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. */
|
|
struct lut_entry {
|
|
void *vaddr; /* virtual address. */
|
|
vm_paddr_t paddr; /* physical address. */
|
|
};
|
|
|
|
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;
|
|
void *ret = (i >= na->na_lut.objtotal) ? lut[0].vaddr : lut[i].vaddr;
|
|
|
|
*pp = (i >= na->na_lut.objtotal) ? lut[0].paddr : lut[i].paddr;
|
|
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;
|
|
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; /* XXX and also np_rxpoll ? */
|
|
|
|
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];
|
|
struct thread *np_td; /* kqueue, just debugging */
|
|
};
|
|
|
|
#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 netmap_catch_rx(struct netmap_generic_adapter *na, int intercept);
|
|
void generic_rx_handler(struct ifnet *ifp, struct mbuf *m);;
|
|
void netmap_catch_tx(struct netmap_generic_adapter *na, int enable);
|
|
int generic_xmit_frame(struct ifnet *ifp, struct mbuf *m, void *addr, u_int len, u_int ring_nr);
|
|
int generic_find_num_desc(struct ifnet *ifp, u_int *tx, u_int *rx);
|
|
void generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq);
|
|
static inline struct ifnet*
|
|
netmap_generic_getifp(struct netmap_generic_adapter *gna)
|
|
{
|
|
if (gna->prev)
|
|
return gna->prev->ifp;
|
|
|
|
return gna->up.up.ifp;
|
|
}
|
|
|
|
//#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 netmap_mitigation_init(struct nm_generic_mit *mit, int idx,
|
|
struct netmap_adapter *na);
|
|
void netmap_mitigation_start(struct nm_generic_mit *mit);
|
|
void netmap_mitigation_restart(struct nm_generic_mit *mit);
|
|
int netmap_mitigation_active(struct nm_generic_mit *mit);
|
|
void netmap_mitigation_cleanup(struct nm_generic_mit *mit);
|
|
#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) */
|
|
uint8_t _ft_port; /* 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_csum_raw(uint8_t *data, size_t len, rawsum_t cur_sum);
|
|
uint16_t nm_csum_ipv4(struct nm_iphdr *iph);
|
|
void nm_csum_tcpudp_ipv4(struct nm_iphdr *iph, void *data,
|
|
size_t datalen, uint16_t *check);
|
|
void nm_csum_tcpudp_ipv6(struct nm_ipv6hdr *ip6h, void *data,
|
|
size_t datalen, uint16_t *check);
|
|
uint16_t nm_csum_fold(rawsum_t cur_sum);
|
|
|
|
void bdg_mismatch_datapath(struct netmap_vp_adapter *na,
|
|
struct netmap_vp_adapter *dst_na,
|
|
struct nm_bdg_fwd *ft_p, struct netmap_ring *ring,
|
|
u_int *j, u_int lim, u_int *howmany);
|
|
|
|
/* persistent virtual port routines */
|
|
int nm_vi_persist(const char *, struct ifnet **);
|
|
void nm_vi_detach(struct ifnet *);
|
|
void nm_vi_init_index(void);
|
|
|
|
#endif /* _NET_NETMAP_KERN_H_ */
|