1198 lines
37 KiB
C
1198 lines
37 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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#define WITH_VALE // comment out to disable VALE support
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#if defined(__FreeBSD__)
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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
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#define NMG_LOCK_T struct mtx
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#define NMG_LOCK_INIT() mtx_init(&netmap_global_lock, \
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"netmap global lock", NULL, MTX_DEF)
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#define NMG_LOCK_DESTROY() mtx_destroy(&netmap_global_lock)
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#define NMG_LOCK() mtx_lock(&netmap_global_lock)
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#define NMG_UNLOCK() mtx_unlock(&netmap_global_lock)
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#define NMG_LOCK_ASSERT() mtx_assert(&netmap_global_lock, MA_OWNED)
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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 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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MALLOC_DECLARE(M_NETMAP);
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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 hrtimer {
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};
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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; \
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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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// XXX a mtx would suffice here too 20130404 gl
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#define NMG_LOCK_T struct semaphore
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#define NMG_LOCK_INIT() sema_init(&netmap_global_lock, 1)
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#define NMG_LOCK_DESTROY()
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#define NMG_LOCK() down(&netmap_global_lock)
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#define NMG_UNLOCK() up(&netmap_global_lock)
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#define NMG_LOCK_ASSERT() // XXX to be completed
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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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/*
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* IFCAP_NETMAP goes into net_device's priv_flags (if_capenable).
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* This was 16 bits up to linux 2.6.36, so we need a 16 bit value on older
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* platforms and tolerate the clash with IFF_DYNAMIC and IFF_BRIDGE_PORT.
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* For the 32-bit value, 0x100000 has no clashes until at least 3.5.1
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*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
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#define IFCAP_NETMAP 0x8000
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#else
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#define IFCAP_NETMAP 0x200000
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#endif
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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 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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/*
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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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* Clients cannot issue concurrent syscall on a ring. The system
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* detects this and reports an error using two flags,
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* NKR_WBUSY and NKR_RBUSY
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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_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 sender
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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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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 folloiwing 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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volatile int nkr_stopped; // XXX what for ?
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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 packets in a queue.
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* XXX who writes to the rx queue ?
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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 ring_id; /* debugging */
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char name[64]; /* diagnostic */
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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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enum txrx { NR_RX = 0, NR_TX = 1 };
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/*
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* The "struct netmap_adapter" extends the "struct adapter"
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* (or equivalent) device descriptor.
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* It contains all base fields needed to support netmap operation.
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* There are in fact different types of netmap adapters
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* (native, generic, VALE switch...) so a netmap_adapter is
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* just the first field in the derived type.
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*/
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struct netmap_adapter {
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/*
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* On linux we do not have a good way to tell if an interface
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* is netmap-capable. So we always use the following trick:
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* NA(ifp) points here, and the first entry (which hopefully
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* always exists and is at least 32 bits) contains a magic
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* value which we can use to detect that the interface is good.
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*/
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uint32_t magic;
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uint32_t na_flags; /* enabled, and other flags */
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#define NAF_SKIP_INTR 1 /* use the regular interrupt handler.
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* useful during initialization
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*/
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#define NAF_SW_ONLY 2 /* forward packets only to sw adapter */
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#define NAF_BDG_MAYSLEEP 4 /* the bridge is allowed to sleep when
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* forwarding packets coming from this
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* interface
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*/
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#define NAF_MEM_OWNER 8 /* the adapter is responsible for the
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* deallocation of the memory allocator
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*/
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#define NAF_NATIVE_ON 16 /* the adapter is native and the attached
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* interface is in netmap mode
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*/
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#define NAF_NETMAP_ON 32 /* netmap is active (either native or
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* emulated. Where possible (e.g. FreeBSD)
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* IFCAP_NETMAP also mirrors this flag.
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*/
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int active_fds; /* number of user-space descriptors using this
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interface, which is equal to the number of
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struct netmap_if objs in the mapped region. */
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u_int num_rx_rings; /* number of adapter receive rings */
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u_int num_tx_rings; /* number of adapter transmit rings */
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u_int num_tx_desc; /* number of descriptor in each queue */
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u_int num_rx_desc;
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/* tx_rings and rx_rings are private but allocated
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* as a contiguous chunk of memory. Each array has
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* N+1 entries, for the adapter queues and for the host queue.
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*/
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struct netmap_kring *tx_rings; /* array of TX rings. */
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struct netmap_kring *rx_rings; /* array of RX rings. */
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void *tailroom; /* space below the rings array */
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/* (used for leases) */
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NM_SELINFO_T tx_si, rx_si; /* global wait queues */
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/* copy of if_qflush and if_transmit pointers, to intercept
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* packets from the network stack when netmap is active.
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*/
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int (*if_transmit)(struct ifnet *, struct mbuf *);
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/* copy of if_input for netmap_send_up() */
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void (*if_input)(struct ifnet *, struct mbuf *);
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/* references to the ifnet and device routines, used by
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* the generic netmap functions.
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*/
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struct ifnet *ifp; /* adapter is ifp->if_softc */
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/*---- callbacks for this netmap adapter -----*/
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/*
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* nm_dtor() is the cleanup routine called when destroying
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* the adapter.
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*
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* nm_register() is called on NIOCREGIF and close() to enter
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* or exit netmap mode on the NIC
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*
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* nm_txsync() pushes packets to the underlying hw/switch
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*
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* nm_rxsync() collects packets from the underlying hw/switch
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*
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* nm_config() returns configuration information from the OS
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*
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* nm_krings_create() XXX
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*
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* nm_krings_delete() XXX
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*
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* nm_notify() is used to act after data have become available.
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* For hw devices this is typically a selwakeup(),
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* but for NIC/host ports attached to a switch (or vice-versa)
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* we also need to invoke the 'txsync' code downstream.
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*/
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/* private cleanup */
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void (*nm_dtor)(struct netmap_adapter *);
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int (*nm_register)(struct netmap_adapter *, int onoff);
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int (*nm_txsync)(struct netmap_adapter *, u_int ring, int flags);
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int (*nm_rxsync)(struct netmap_adapter *, u_int ring, int flags);
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#define NAF_FORCE_READ 1
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#define NAF_FORCE_RECLAIM 2
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/* return configuration information */
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int (*nm_config)(struct netmap_adapter *,
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u_int *txr, u_int *txd, u_int *rxr, u_int *rxd);
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int (*nm_krings_create)(struct netmap_adapter *);
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void (*nm_krings_delete)(struct netmap_adapter *);
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int (*nm_notify)(struct netmap_adapter *,
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u_int ring, enum txrx, int flags);
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#define NAF_GLOBAL_NOTIFY 4
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#define NAF_DISABLE_NOTIFY 8
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/* standard refcount to control the lifetime of the adapter
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* (it should be equal to the lifetime of the corresponding ifp)
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*/
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int na_refcount;
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/* memory allocator (opaque)
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* We also cache a pointer to the lut_entry for translating
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* buffer addresses, and the total number of buffers.
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*/
|
|
struct netmap_mem_d *nm_mem;
|
|
struct lut_entry *na_lut;
|
|
uint32_t na_lut_objtotal; /* max buffer index */
|
|
|
|
/* used internally. If non-null, the interface cannot be bound
|
|
* from userspace
|
|
*/
|
|
void *na_private;
|
|
};
|
|
|
|
|
|
/*
|
|
* 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_private)
|
|
#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;
|
|
|
|
u_int offset; /* Offset of ethernet header for each packet. */
|
|
};
|
|
|
|
|
|
struct netmap_hw_adapter { /* physical device */
|
|
struct netmap_adapter up;
|
|
|
|
struct net_device_ops nm_ndo; // XXX linux only
|
|
};
|
|
|
|
|
|
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_timer and mit_pending implement rx interrupt mitigation,
|
|
*/
|
|
struct net_device_ops generic_ndo;
|
|
void (*save_if_input)(struct ifnet *, struct mbuf *);
|
|
|
|
struct hrtimer mit_timer;
|
|
int mit_pending;
|
|
#ifdef linux
|
|
netdev_tx_t (*save_start_xmit)(struct mbuf *, struct ifnet *);
|
|
#endif
|
|
};
|
|
|
|
#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 notify callback */
|
|
int (*save_notify)(struct netmap_adapter *,
|
|
u_int ring, enum txrx, int flags);
|
|
|
|
/*
|
|
* When we attach a physical interface to the bridge, we
|
|
* allow the controlling process to terminate, so we need
|
|
* a place to store the netmap_priv_d data structure.
|
|
* This is only done when physical interfaces
|
|
* are attached to a bridge.
|
|
*/
|
|
struct netmap_priv_d *na_kpriv;
|
|
};
|
|
|
|
|
|
#endif /* WITH_VALE */
|
|
|
|
|
|
/* 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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 driver
|
|
* when reinitializing a ring.
|
|
*/
|
|
int netmap_attach(struct netmap_adapter *);
|
|
int netmap_attach_common(struct netmap_adapter *);
|
|
void netmap_detach_common(struct netmap_adapter *na);
|
|
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);
|
|
|
|
void netmap_disable_all_rings(struct ifnet *);
|
|
void netmap_enable_all_rings(struct ifnet *);
|
|
void netmap_disable_ring(struct netmap_kring *kr);
|
|
|
|
|
|
/* 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_NATIVE_ON | 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;
|
|
#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;
|
|
#endif
|
|
na->na_flags &= ~(NAF_NATIVE_ON | NAF_NETMAP_ON);
|
|
#ifdef IFCAP_NETMAP /* or FreeBSD ? */
|
|
ifp->if_capenable &= ~IFCAP_NETMAP;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 *);
|
|
|
|
|
|
/*
|
|
* validates parameters in the ring/kring, returns a value for head,
|
|
* and the 'reserved' value in the argument.
|
|
* If any error, returns ring_size lim to force a reinit.
|
|
*/
|
|
uint32_t nm_rxsync_prologue(struct netmap_kring *);
|
|
|
|
|
|
/*
|
|
* update kring and ring at the end of txsync.
|
|
*/
|
|
static inline void
|
|
nm_txsync_finalize(struct netmap_kring *kring)
|
|
{
|
|
/* update ring head/tail to what the kernel knows */
|
|
kring->ring->tail = kring->rtail = kring->nr_hwtail;
|
|
kring->ring->head = kring->rhead = kring->nr_hwcur;
|
|
|
|
/* note, head/rhead/hwcur might be behind cur/rcur
|
|
* if no carrier
|
|
*/
|
|
ND(5, "%s now hwcur %d hwtail %d head %d cur %d tail %d",
|
|
kring->name, kring->nr_hwcur, kring->nr_hwtail,
|
|
kring->rhead, kring->rcur, kring->rtail);
|
|
}
|
|
|
|
|
|
/*
|
|
* update kring and ring at the end of rxsync
|
|
*/
|
|
static inline void
|
|
nm_rxsync_finalize(struct netmap_kring *kring)
|
|
{
|
|
/* tell userspace that there might be new packets */
|
|
//struct netmap_ring *ring = kring->ring;
|
|
ND("head %d cur %d tail %d -> %d", ring->head, ring->cur, ring->tail,
|
|
kring->nr_hwtail);
|
|
kring->ring->tail = kring->rtail = kring->nr_hwtail;
|
|
/* make a copy of the state for next round */
|
|
kring->rhead = kring->ring->head;
|
|
kring->rcur = kring->ring->cur;
|
|
}
|
|
|
|
|
|
/* check/fix address and len in tx rings */
|
|
#if 1 /* debug version */
|
|
#define NM_CHECK_ADDR_LEN(_a, _l) do { \
|
|
if (_a == netmap_buffer_base || _l > NETMAP_BUF_SIZE) { \
|
|
RD(5, "bad addr/len ring %d slot %d idx %d len %d", \
|
|
ring_nr, nm_i, slot->buf_idx, len); \
|
|
if (_l > NETMAP_BUF_SIZE) \
|
|
_l = NETMAP_BUF_SIZE; \
|
|
} } while (0)
|
|
#else /* no debug version */
|
|
#define NM_CHECK_ADDR_LEN(_a, _l) do { \
|
|
if (_l > NETMAP_BUF_SIZE) \
|
|
_l = NETMAP_BUF_SIZE; \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
/*---------------------------------------------------------------*/
|
|
/*
|
|
* Support routines to be used with the VALE switch
|
|
*/
|
|
int netmap_update_config(struct netmap_adapter *na);
|
|
int netmap_krings_create(struct netmap_adapter *na, u_int ntx, u_int nrx, u_int tailroom);
|
|
void netmap_krings_delete(struct netmap_adapter *na);
|
|
int netmap_rxsync_from_host(struct netmap_adapter *na, struct thread *td, void *pwait);
|
|
|
|
|
|
struct netmap_if *
|
|
netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
|
|
uint16_t ringid, int *err);
|
|
|
|
|
|
|
|
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)(char *buf, u_int len,
|
|
uint8_t *ring_nr, struct netmap_vp_adapter *);
|
|
u_int netmap_bdg_learning(char *, u_int, uint8_t *,
|
|
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);
|
|
void netmap_init_bridges(void);
|
|
int netmap_bdg_ctl(struct nmreq *nmr, bdg_lookup_fn_t func);
|
|
|
|
#else /* !WITH_VALE */
|
|
#define netmap_get_bdg_na(_1, _2, _3) 0
|
|
#define netmap_init_bridges(_1)
|
|
#define netmap_bdg_ctl(_1, _2) EINVAL
|
|
#endif /* !WITH_VALE */
|
|
|
|
/* 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_IFPNAME(ifp) ((ifp) ? (ifp)->if_xname : "zombie")
|
|
|
|
// #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, NM_IFPNAME(__na->ifp), __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, NM_IFPNAME(__na->ifp), __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
|
|
*/
|
|
extern u_int netmap_buf_size;
|
|
#define NETMAP_BUF_SIZE netmap_buf_size // XXX remove
|
|
extern int netmap_mitigate; // XXX not really used
|
|
extern int netmap_no_pendintr;
|
|
extern u_int netmap_total_buffers; // global allocator
|
|
extern char *netmap_buffer_base; // global allocator
|
|
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;
|
|
|
|
/*
|
|
* NA returns a pointer to the struct netmap adapter from the ifp,
|
|
* WNA is used to write it.
|
|
*/
|
|
#ifndef WNA
|
|
#define WNA(_ifp) (_ifp)->if_pspare[0]
|
|
#endif
|
|
#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__
|
|
|
|
/* 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(bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
|
|
{
|
|
if (map)
|
|
bus_dmamap_load(tag, map, buf, NETMAP_BUF_SIZE,
|
|
netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
|
|
}
|
|
|
|
/* update the map when a buffer changes. */
|
|
static inline void
|
|
netmap_reload_map(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,
|
|
netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
|
|
}
|
|
}
|
|
|
|
#else /* linux */
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
#define netmap_load_map(_t, _m, _b)
|
|
#define netmap_reload_map(_t, _m, _b)
|
|
#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;
|
|
extern struct lut_entry *netmap_buffer_lut;
|
|
#define NMB_VA(i) (netmap_buffer_lut[i].vaddr)
|
|
#define NMB_PA(i) (netmap_buffer_lut[i].paddr)
|
|
|
|
/*
|
|
* 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_slot *slot)
|
|
{
|
|
uint32_t i = slot->buf_idx;
|
|
return (unlikely(i >= netmap_total_buffers)) ? NMB_VA(0) : NMB_VA(i);
|
|
}
|
|
|
|
static inline void *
|
|
PNMB(struct netmap_slot *slot, uint64_t *pp)
|
|
{
|
|
uint32_t i = slot->buf_idx;
|
|
void *ret = (i >= netmap_total_buffers) ? NMB_VA(0) : NMB_VA(i);
|
|
|
|
*pp = (i >= netmap_total_buffers) ? NMB_PA(0) : NMB_PA(i);
|
|
return ret;
|
|
}
|
|
|
|
/* Generic version of NMB, which uses device-specific memory. */
|
|
static inline void *
|
|
BDG_NMB(struct netmap_adapter *na, struct netmap_slot *slot)
|
|
{
|
|
struct lut_entry *lut = na->na_lut;
|
|
uint32_t i = slot->buf_idx;
|
|
return (unlikely(i >= na->na_lut_objtotal)) ?
|
|
lut[0].vaddr : lut[i].vaddr;
|
|
}
|
|
|
|
|
|
|
|
void netmap_txsync_to_host(struct netmap_adapter *na);
|
|
|
|
|
|
/*
|
|
* Structure associated to each thread which registered an interface.
|
|
*
|
|
* The first 4 fields of this structure are written by NIOCREGIF and
|
|
* read by poll() and NIOC?XSYNC.
|
|
*
|
|
* There is low contention among writers (a correct user program
|
|
* should have none) and among writers and readers, so we use a
|
|
* single global lock to protect the structure initialization;
|
|
* since initialization involves the allocation of memory,
|
|
* we reuse the memory allocator lock.
|
|
*
|
|
* Read access to the structure is lock free. Readers must check that
|
|
* np_nifp is not NULL before using the other fields.
|
|
* If np_nifp is NULL initialization has not been performed,
|
|
* so they should return an error to userspace.
|
|
*
|
|
* The ref_done field is used to regulate access to the refcount in the
|
|
* memory allocator. The refcount must be incremented at most once for
|
|
* each open("/dev/netmap"). The increment is performed by the first
|
|
* function that calls netmap_get_memory() (currently called by
|
|
* mmap(), NIOCGINFO and NIOCREGIF).
|
|
* If the refcount is incremented, it is then decremented when the
|
|
* private structure is destroyed.
|
|
*/
|
|
struct netmap_priv_d {
|
|
struct netmap_if * volatile np_nifp; /* netmap if descriptor. */
|
|
|
|
struct netmap_adapter *np_na;
|
|
int np_ringid; /* from the ioctl */
|
|
u_int np_qfirst, np_qlast; /* range of rings to scan */
|
|
uint16_t np_txpoll;
|
|
|
|
struct netmap_mem_d *np_mref; /* use with NMG_LOCK held */
|
|
/* np_refcount is only used on FreeBSD */
|
|
int np_refcount; /* use with NMG_LOCK held */
|
|
};
|
|
|
|
|
|
/*
|
|
* 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_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);
|
|
|
|
/*
|
|
* 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 netmap_generic_adapter *na);
|
|
void netmap_mitigation_start(struct netmap_generic_adapter *na);
|
|
void netmap_mitigation_restart(struct netmap_generic_adapter *na);
|
|
int netmap_mitigation_active(struct netmap_generic_adapter *na);
|
|
void netmap_mitigation_cleanup(struct netmap_generic_adapter *na);
|
|
|
|
#endif /* _NET_NETMAP_KERN_H_ */
|