ce3ee1e7c4
This includes the following: - use separate memory regions for VALE ports - locking fixes - some simplifications in the NIC-specific routines - performance improvements for the VALE switch - some new features in the pkt-gen test program - documentation updates There are small API changes that require programs to be recompiled (NETMAP_API has been bumped so you will detect old binaries at runtime). In particular: - struct netmap_slot now is 16 bytes to support an extra pointer, which may save one data copy when using VALE ports or VMs; - the struct netmap_if has two extra fields; MFC after: 3 days
711 lines
22 KiB
C
711 lines
22 KiB
C
/*
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* Copyright (C) 2011-2013 Matteo Landi, Luigi Rizzo. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*
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* 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(__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 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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#define NM_ATOMIC_T volatile int
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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 NM_SEND_UP(ifp, m) netif_rx(m)
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#define NM_ATOMIC_T volatile long unsigned int
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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 %s [%d] " format "\n", \
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(int)__xxts.tv_sec % 1000, (int)__xxts.tv_usec, \
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__FUNCTION__, __LINE__, ##__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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/*
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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->cur - ring->reserved
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*
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* nr_hwavail the number of slots "owned" by userspace.
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* nr_hwavail =:= ring->avail + ring->reserved
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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 (hwcur + hwavail + 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_hwcur + nkr_hwavail <= 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_hwcur+ nkr_hwavail
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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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* q_lock is used to arbitrate access to the kring from within the netmap
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* code, and this and other protections guarantee that there is never
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* more than 1 concurrent call to txsync or rxsync. So we are free
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* to manipulate the kring from within txsync/rxsync without any extra
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* locks.
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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_hwavail;
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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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int32_t nkr_hwofs; /* offset between NIC and netmap ring */
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uint16_t nkr_slot_flags; /* initial value for flags */
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struct netmap_adapter *na;
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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)
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uint32_t nkr_hwlease;
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uint32_t nkr_lease_idx;
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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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volatile int nkr_stopped;
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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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/*
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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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| |<-hwcur | |<-hwcur
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| reserved h | | (ready |
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+----------- w -+ | to be |
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cur->| a | | sent) h |
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| v | +---------- w |
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| a | cur->| (being a |
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| i | | prepared) v |
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| avail l | | a |
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+-----------------+ + a ------ i +
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| | ... | v l |<-hwlease
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| (being | ... | a | ...
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| prepared) | ... | i | ...
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+-----------------+ ... | l | ...
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| |<-hwlease +-----------------+
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| | | |
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| | | |
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| | | |
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+-----------------+ +-----------------+
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* The cur/avail (user view) and hwcur/hwavail (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 hwavail,
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* and completions cause avail to advance.
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* On a Tx ring, hwlease is always between cur and hwavail,
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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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/*
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* This struct extends the 'struct adapter' (or
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* equivalent) device descriptor. It contains all fields needed to
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* support netmap operation.
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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 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; /* future place for IFCAP_NETMAP */
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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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int refcount; /* 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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/*
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* The selwakeup in the interrupt thread can use per-ring
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* and/or global wait queues. We track how many clients
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* of each type we have so we can optimize the drivers,
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* and especially avoid huge contention on the locks.
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*/
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int na_single; /* threads attached to a single hw queue */
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int na_multi; /* threads attached to multiple hw queues */
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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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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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/* 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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NM_LOCK_T core_lock; /* used if no device lock available */
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int (*nm_register)(struct ifnet *, int onoff);
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int (*nm_txsync)(struct ifnet *, u_int ring, int flags);
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int (*nm_rxsync)(struct ifnet *, 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 ifnet *, u_int *txr, u_int *txd,
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u_int *rxr, u_int *rxd);
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/*
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* Bridge support:
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*
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* bdg_port is the port number used in the bridge;
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* na_bdg_refcount is a refcount used for bridge ports,
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* when it goes to 0 we can detach+free this port
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* (a bridge port is always attached if it exists;
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* it is not always registered)
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* na_bdg points to the bridge this NA is attached to.
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*/
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int bdg_port;
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int na_bdg_refcount;
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struct nm_bridge *na_bdg;
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/* When we attach a physical interface to the bridge, we
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* allow the controlling process to terminate, so we need
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* a place to store the netmap_priv_d data structure.
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* This is only done when physical interfaces are attached to a bridge.
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*/
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struct netmap_priv_d *na_kpriv;
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/* memory allocator */
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struct netmap_mem_d *nm_mem;
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#ifdef linux
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struct net_device_ops nm_ndo;
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#endif /* linux */
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};
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/*
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* Available space in the ring.
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*/
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static inline uint32_t
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nm_kr_space(struct netmap_kring *k, int is_rx)
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{
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int space;
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if (is_rx) {
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int busy = k->nkr_hwlease - k->nr_hwcur;
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if (busy < 0)
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busy += k->nkr_num_slots;
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space = k->nkr_num_slots - 1 - busy;
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} else {
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space = k->nr_hwcur + k->nr_hwavail - k->nkr_hwlease;
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if (space < 0)
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space += k->nkr_num_slots;
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}
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#if 0
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// sanity check
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if (k->nkr_hwlease >= k->nkr_num_slots ||
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k->nr_hwcur >= k->nkr_num_slots ||
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k->nr_hwavail >= k->nkr_num_slots ||
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busy < 0 ||
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busy >= k->nkr_num_slots) {
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D("invalid kring, cur %d avail %d lease %d lease_idx %d lim %d", k->nr_hwcur, k->nr_hwavail, k->nkr_hwlease,
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k->nkr_lease_idx, k->nkr_num_slots);
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}
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#endif
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return space;
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}
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/* return update position */
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static inline uint32_t
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nm_kr_rxpos(struct netmap_kring *k)
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{
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uint32_t pos = k->nr_hwcur + k->nr_hwavail;
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if (pos >= k->nkr_num_slots)
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pos -= k->nkr_num_slots;
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#if 0
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if (pos >= k->nkr_num_slots ||
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k->nkr_hwlease >= k->nkr_num_slots ||
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k->nr_hwcur >= k->nkr_num_slots ||
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k->nr_hwavail >= k->nkr_num_slots ||
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k->nkr_lease_idx >= k->nkr_num_slots) {
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D("invalid kring, cur %d avail %d lease %d lease_idx %d lim %d", k->nr_hwcur, k->nr_hwavail, k->nkr_hwlease,
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k->nkr_lease_idx, k->nkr_num_slots);
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}
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#endif
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return pos;
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}
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/* make a lease on the kring for N positions. return the
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* lease index
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*/
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static inline uint32_t
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nm_kr_lease(struct netmap_kring *k, u_int n, int is_rx)
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{
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uint32_t lim = k->nkr_num_slots - 1;
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uint32_t lease_idx = k->nkr_lease_idx;
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k->nkr_leases[lease_idx] = NR_NOSLOT;
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k->nkr_lease_idx = nm_next(lease_idx, lim);
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if (n > nm_kr_space(k, is_rx)) {
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D("invalid request for %d slots", n);
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panic("x");
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}
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/* XXX verify that there are n slots */
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k->nkr_hwlease += n;
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if (k->nkr_hwlease > lim)
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k->nkr_hwlease -= lim + 1;
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if (k->nkr_hwlease >= k->nkr_num_slots ||
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k->nr_hwcur >= k->nkr_num_slots ||
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k->nr_hwavail >= k->nkr_num_slots ||
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k->nkr_lease_idx >= k->nkr_num_slots) {
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D("invalid kring %s, cur %d avail %d lease %d lease_idx %d lim %d",
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k->na->ifp->if_xname,
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k->nr_hwcur, k->nr_hwavail, k->nkr_hwlease,
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k->nkr_lease_idx, k->nkr_num_slots);
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}
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return lease_idx;
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}
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/*
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* XXX NETMAP_DELETING() is unused
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*
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* The combination of "enable" (ifp->if_capenable & IFCAP_NETMAP)
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* and refcount gives the status of the interface, namely:
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*
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* enable refcount Status
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*
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* FALSE 0 normal operation
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* FALSE != 0 -- (impossible)
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* TRUE 1 netmap mode
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* TRUE 0 being deleted.
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*/
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#define NETMAP_DELETING(_na) ( ((_na)->refcount == 0) && \
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( (_na)->ifp->if_capenable & IFCAP_NETMAP) )
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/*
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* The following are support routines used by individual drivers to
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* support netmap operation.
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*
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* netmap_attach() initializes a struct netmap_adapter, allocating the
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* struct netmap_ring's and the struct selinfo.
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*
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* netmap_detach() frees the memory allocated by netmap_attach().
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*
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* netmap_transmit() replaces the if_transmit routine of the interface,
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* 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 *, u_int);
|
|
void netmap_detach(struct ifnet *);
|
|
int netmap_transmit(struct ifnet *, struct mbuf *);
|
|
enum txrx { NR_RX = 0, NR_TX = 1 };
|
|
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 *);
|
|
|
|
u_int nm_bound_var(u_int *v, u_int dflt, u_int lo, u_int hi, const char *msg);
|
|
|
|
/*
|
|
* The following bridge-related interfaces are used by other kernel modules
|
|
* In the version that 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_adapter *);
|
|
int netmap_bdg_ctl(struct nmreq *nmr, bdg_lookup_fn_t func);
|
|
u_int netmap_bdg_learning(char *, u_int, uint8_t *, struct netmap_adapter *);
|
|
#define NM_NAME "vale" /* prefix for the bridge port name */
|
|
#define NM_BDG_MAXPORTS 254 /* up to 32 for bitmap, 254 ok otherwise */
|
|
#define NM_BDG_BROADCAST NM_BDG_MAXPORTS
|
|
#define NM_BDG_NOPORT (NM_BDG_MAXPORTS+1)
|
|
|
|
extern u_int netmap_buf_size;
|
|
#define NETMAP_BUF_SIZE netmap_buf_size // XXX remove
|
|
extern int netmap_mitigate;
|
|
extern int netmap_no_pendintr;
|
|
extern u_int netmap_total_buffers;
|
|
extern char *netmap_buffer_base;
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* NA returns a pointer to the struct netmap adapter from the ifp,
|
|
* WNA is used to write it.
|
|
* SWNA() is used for the "host stack" endpoint associated
|
|
* to an interface. It is allocated together with the main NA(),
|
|
* as an array of two objects.
|
|
*/
|
|
#ifndef WNA
|
|
#define WNA(_ifp) (_ifp)->if_pspare[0]
|
|
#endif
|
|
#define NA(_ifp) ((struct netmap_adapter *)WNA(_ifp))
|
|
#define SWNA(_ifp) (NA(_ifp) + 1)
|
|
|
|
/*
|
|
* 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 successfull 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;
|
|
}
|
|
|
|
/* 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)
|
|
|
|
#ifdef __FreeBSD__
|
|
MALLOC_DECLARE(M_NETMAP);
|
|
#endif /* __FreeBSD__ */
|
|
|
|
|
|
void netmap_disable_all_rings(struct ifnet *);
|
|
void netmap_enable_all_rings(struct ifnet *);
|
|
|
|
#endif /* _NET_NETMAP_KERN_H_ */
|