mdoc(7) and english grammar makeover.
Submitted by: ru
This commit is contained in:
parent
30fd73fb81
commit
424e9d7165
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=133386
@ -1,4 +1,3 @@
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.\" $FreeBSD$
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.\" $NetBSD: altq.9,v 1.8 2002/05/28 11:41:45 wiz Exp $
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.\" $OpenBSD: altq.9,v 1.4 2001/07/12 12:41:42 itojun Exp $
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.\"
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@ -27,6 +26,8 @@
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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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.\" $FreeBSD$
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.\"
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.Dd August 7, 2004
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.Dt ALTQ 9
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.Os
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@ -43,7 +44,9 @@
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.Ss Enqueue macros
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.Fn IFQ_ENQUEUE "struct ifaltq *ifq" "struct mbuf *m" "int error"
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.Fn IFQ_HANDOFF "struct ifnet *ifp" "struct mbuf *m" "int error"
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.Fn IFQ_HANDOFF_ADJ "struct ifnet *ifp" "struct mbuf *m" "int adjust" "int error"
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.Fo IFQ_HANDOFF_ADJ
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.Fa "struct ifnet *ifp" "struct mbuf *m" "int adjust" "int error"
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.Fc
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.\"
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.Ss Dequeue macros
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.Fn IFQ_DEQUEUE "struct ifaltq *ifq" "struct mbuf *m"
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@ -75,7 +78,7 @@ touch the internal fields of the output queue structure.
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The macros are independent from the
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.Nm
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implementation, and compatible with the traditional
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.Dv ifqueue
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.Vt ifqueue
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macros for ease of transition.
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.Pp
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.Fn IFQ_ENQUEUE ,
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@ -87,13 +90,15 @@ enqueue a packet
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to the queue
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.Fa ifq .
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The underlying queuing discipline may discard the packet.
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The
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.Fa error
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is set to 0 on success, or
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.Dv ENOBUFS
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argument is set to 0 on success, or
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.Er ENOBUFS
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if the packet is discarded.
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The packet pointed to by
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.Fa m
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will be freed by the device driver on success or by the queuing discipline on
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failure so that the caller should not touch
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will be freed by the device driver on success, or by the queuing discipline on
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failure, so the caller should not touch
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.Fa m
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after enqueuing.
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.Fn IFQ_HANDOFF
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@ -120,14 +125,14 @@ under rate-limiting.
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.Pp
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.Fn IFQ_POLL_NOLOCK
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returns the next packet without removing it from the queue.
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The caller must hold the queue mutex when calling to
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The caller must hold the queue mutex when calling
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.Fn IFQ_POLL_NOLOCK
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in order to guarantee that a subsequent call to
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.Fn IFQ_DEQUEUE_NOLOCK
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dequeues the same packet.
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.Pp
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.Fn IFQ_XXX_NOLOCK
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variants - if available - always assume that the caller holds the queue mutex.
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.Fn IFQ_*_NOLOCK
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variants (if available) always assume that the caller holds the queue mutex.
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They can be grabbed with
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.Fn IFQ_LOCK
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and released with
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@ -148,9 +153,9 @@ if the queuing discipline is non-work conserving.
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.Pp
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.Fn IFQ_DRV_DEQUEUE
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moves up to
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.Va ifq->ifq_drv_maxlen
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.Fa ifq->ifq_drv_maxlen
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packets from the queue to the
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.Ql driver managed
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.Dq "driver managed"
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queue and returns the first one via
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.Fa m .
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As for
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@ -162,57 +167,58 @@ even for a non-empty queue.
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Subsequent calls to
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.Fn IFQ_DRV_DEQUEUE
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pass the packets from the
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.Ql driver managed
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.Dq "driver managed"
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queue without obtaining the queue mutex.
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It is the responsibility of the caller to protect against concurrent access.
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Enabling
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.Nm
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for a given queue sets
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.Va ifq_drv_maxlen
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to
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.Dv 0
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as the
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.Ql bulk dequeue
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to 0 as the
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.Dq "bulk dequeue"
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performed by
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.Fn IFQ_DRV_DEQUEUE
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for higher values of
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.Va ifq_drv_maxlen
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is adverse to
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.Sy ALTQ's
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.Nm ALTQ Ns 's
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internal timing.
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Note that a driver must not mix
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.Fn IFQ_DRV_XXX
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.Fn IFQ_DRV_*
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macros with the default dequeue macros as the default macros do not look at the
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.Ql driver managed
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.Dq "driver managed"
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queue which might lead to an mbuf leak.
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.Pp
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.Fn IFQ_DRV_PREPEND
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prepends
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.Fa m
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to the
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.Ql driver managed
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.Dq "driver managed"
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queue from where it will be obtained with the next call to
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.Fn IFQ_DRV_DEQUEUE .
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.Pp
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.Fn IFQ_DRV_PURGE
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flushes all packets in the
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.Ql driver managed
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.Dq "driver managed"
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queue and calls to
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.Fn IFQ_PURGE
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afterwards.
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.Pp
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.Fn IFQ_DRV_IS_EMPTY
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checks for packets in the
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.Ql driver managed
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part of the queue. If it is empty it forwards to
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.Dq "driver managed"
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part of the queue.
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If it is empty, it forwards to
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.Fn IFQ_IS_EMPTY .
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.Pp
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.Pp
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.Fn IFQ_SET_MAXLEN
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sets the queue length limit to the default FIFO queue.
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.Va ifaltq.ifq_drv_maxlen
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controls the length limit of the
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.Ql driver managed
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The
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.Va ifq_drv_maxlen
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member of the
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.Vt ifaltq
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structure controls the length limit of the
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.Dq "driver managed"
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queue.
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.Pp
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.Fn IFQ_INC_LEN
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@ -222,26 +228,26 @@ increment or decrement the current queue length in packets.
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This is mostly for internal purposes.
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.Pp
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.Fn IFQ_INC_DROPS
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increments the drop counter and is equal to
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increments the drop counter and is identical to
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.Fn IF_DROP .
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It is defined for naming consistency.
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It is defined for naming consistency only.
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.Pp
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.Fn IFQ_SET_READY
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sets a flag to indicate this driver is converted to use the new macros.
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sets a flag to indicate that a driver was converted to use the new macros.
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.Nm
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can be enabled only on interfaces with this flag.
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.Sh COMPATIBILITY
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.Ss ifaltq structure
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.Ss Vt ifaltq Ss structure
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In order to keep compatibility with the existing code, the new
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output queue structure
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.Dv ifaltq
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.Vt ifaltq
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has the same fields.
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The traditional
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.Fn IF_XXX
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.Fn IF_*
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macros and the code directly referencing the fields within
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.Dv if_snd
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.Va if_snd
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still work with
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.Dv ifaltq .
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.Vt ifaltq .
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.Bd -literal
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##old-style## ##new-style##
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@ -259,9 +265,9 @@ still work with
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.Ed
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The new structure replaces
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.Dv struct ifqueue
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.Vt "struct ifqueue"
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in
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.Dv struct ifnet .
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.Vt "struct ifnet" .
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.Bd -literal
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##old-style## ##new-style##
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@ -275,8 +281,8 @@ in
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.Ed
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The (simplified) new
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.Fn IFQ_XXX
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macros looks like:
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.Fn IFQ_*
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macros look like:
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.Bd -literal
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#define IFQ_DEQUEUE(ifq, m) \e
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if (ALTQ_IS_ENABLED((ifq)) \e
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@ -307,24 +313,27 @@ do { \e
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.Pp
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.Fn IFQ_ENQUEUE
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does the following:
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.Pp
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.Bl -hyphen -compact
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.It
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queue a packet
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queue a packet,
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.It
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drop (and free) a packet if the enqueue operation fails
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drop (and free) a packet if the enqueue operation fails.
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.El
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.Pp
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If the enqueue operation fails,
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.Fa error
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is set to
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.Dv ENOBUFS .
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.Fa mbuf
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is freed by the queuing discipline.
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.Er ENOBUFS .
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The
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.Fa m
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mbuf is freed by the queuing discipline.
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The caller should not touch mbuf after calling
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.Fn IFQ_ENQUEUE
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so that the caller may need to copy
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.Fa m_pkthdr.len
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.Va m_pkthdr.len
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or
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.Fa m_flags
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.Va m_flags
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field beforehand for statistics.
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.Fn IFQ_HANDOFF
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and
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@ -347,24 +356,24 @@ looks as follows:
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{ | {
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...... | ......
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|
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| mflags = m-\*[Gt]m_flags;
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| len = m-\*[Gt]m_pkthdr.len;
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| mflags = m->m_flags;
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| len = m->m_pkthdr.len;
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s = splimp(); | s = splimp();
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if (IF_QFULL(\*[Am]ifp-\*[Gt]if_snd)) { | IFQ_ENQUEUE(\*[Am]ifp-\*[Gt]if_snd, m,
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if (IF_QFULL(&ifp->if_snd)) { | IFQ_ENQUEUE(&ifp->if_snd, m,
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| error);
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IF_DROP(\*[Am]ifp-\*[Gt]if_snd); | if (error != 0) {
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IF_DROP(&ifp->if_snd); | if (error != 0) {
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splx(s); | splx(s);
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senderr(ENOBUFS); | return (error);
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} | }
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IF_ENQUEUE(\*[Am]ifp-\*[Gt]if_snd, m); |
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ifp-\*[Gt]if_obytes += | ifp-\*[Gt]if_obytes += len;
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m-\*[Gt]m_pkthdr.len; |
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if (m-\*[Gt]m_flags \*[Am] M_MCAST) | if (mflags \*[Am] M_MCAST)
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ifp-\*[Gt]if_omcasts++; | ifp-\*[Gt]if_omcasts++;
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IF_ENQUEUE(&ifp->if_snd, m); |
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ifp->if_obytes += | ifp->if_obytes += len;
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m->m_pkthdr.len; |
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if (m->m_flags & M_MCAST) | if (mflags & M_MCAST)
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ifp->if_omcasts++; | ifp->if_omcasts++;
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|
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if ((ifp-\*[Gt]if_flags \*[Am] IFF_OACTIVE) | if ((ifp-\*[Gt]if_flags \*[Am] IFF_OACTIVE)
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if ((ifp->if_flags & IFF_OACTIVE) | if ((ifp->if_flags & IFF_OACTIVE)
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== 0) | == 0)
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(*ifp-\*[Gt]if_start)(ifp); | (*ifp-\*[Gt]if_start)(ifp);
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(*ifp->if_start)(ifp); | (*ifp->if_start)(ifp);
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splx(s); | splx(s);
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return (error); | return (error);
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@ -381,23 +390,23 @@ First, make sure the corresponding
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is already converted to the new style.
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.Pp
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Look for
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.Fa if_snd
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.Va if_snd
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in the driver.
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Probably, you need to make changes to the lines that include
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.Fa if_snd .
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.Va if_snd .
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.Ss Empty check operation
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If the code checks
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.Fa ifq_head
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.Va ifq_head
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to see whether the queue is empty or not, use
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.Fn IFQ_IS_EMPTY .
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.Bd -literal
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##old-style## ##new-style##
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|
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if (ifp-\*[Gt]if_snd.ifq_head != NULL) | if (!IFQ_IS_EMPTY(\*[Am]ifp-\*[Gt]if_snd))
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if (ifp->if_snd.ifq_head != NULL) | if (!IFQ_IS_EMPTY(&ifp->if_snd))
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|
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.Ed
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.Fn IFQ_IS_EMPTY
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checks only if there is any packet stored in the queue.
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only checks if there is any packet stored in the queue.
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Note that even when
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.Fn IFQ_IS_EMPTY
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is
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@ -425,7 +434,7 @@ due to rate-limiting.
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.Bd -literal
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##old-style## ##new-style##
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|
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IF_DEQUEUE(\*[Am]ifp-\*[Gt]if_snd, m); | IFQ_DEQUEUE(\*[Am]ifp-\*[Gt]if_snd, m);
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IF_DEQUEUE(&ifp->if_snd, m); | IFQ_DEQUEUE(&ifp->if_snd, m);
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| if (m == NULL)
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| return;
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|
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@ -442,17 +451,17 @@ and
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.Bd -literal
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##old-style## ##new-style##
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|
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| IFQ_LOCK(\*[Am]ifp-\*[Gt]if_snd);
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m = ifp-\*[Gt]if_snd.ifq_head; | IFQ_POLL_NOLOCK(\*[Am]ifp-\*[Gt]if_snd, m);
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| IFQ_LOCK(&ifp->if_snd);
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m = ifp->if_snd.ifq_head; | IFQ_POLL_NOLOCK(&ifp->if_snd, m);
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if (m != NULL) { | if (m != NULL) {
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|
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/* use m to get resources */ | /* use m to get resources */
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if (something goes wrong) | if (something goes wrong)
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| IFQ_UNLOCK(\*[Am]ifp-\*[Gt]if_snd);
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| IFQ_UNLOCK(&ifp->if_snd);
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return; | return;
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|
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IF_DEQUEUE(\*[Am]ifp-\*[Gt]if_snd, m); | IFQ_DEQUEUE_NOLOCK(\*[Am]ifp-\*[Gt]if_snd, m);
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| IFQ_UNLOCK(\*[Am]ifp-\*[Gt]if_snd);
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IF_DEQUEUE(&ifp->if_snd, m); | IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
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| IFQ_UNLOCK(&ifp->if_snd);
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|
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/* kick the hardware */ | /* kick the hardware */
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} | }
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@ -465,27 +474,27 @@ under the same lock as a previous
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returns the same packet.
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Note that they need to be guarded by
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.Fn IFQ_LOCK .
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.Ss Eliminating IF_PREPEND
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.Ss Eliminating Fn IF_PREPEND
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If the code uses
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.Fn IF_PREPEND ,
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you have to eliminate it unless you can use a
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.Ql driver managed
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queue which allows use of
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.Dq "driver managed"
|
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queue which allows the use of
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.Fn IFQ_DRV_PREPEND
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as a substitute.
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A common use of
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A common usage of
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.Fn IF_PREPEND
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is to cancel the previous dequeue operation.
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You have to convert the logic into poll-and-dequeue.
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.Bd -literal
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##old-style## ##new-style##
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|
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| IFQ_LOCK(\*[Am]ifp-\*[Gt]if_snd);
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IF_DEQUEUE(\*[Am]ifp-\*[Gt]if_snd, m); | IFQ_POLL_NOLOCK(\*[Am]ifp-\*[Gt]if_snd, m);
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| IFQ_LOCK(&ifp->if_snd);
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IF_DEQUEUE(&ifp->if_snd, m); | IFQ_POLL_NOLOCK(&ifp->if_snd, m);
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if (m != NULL) { | if (m != NULL) {
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|
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if (something_goes_wrong) { | if (something_goes_wrong) {
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IF_PREPEND(\*[Am]ifp-\*[Gt]if_snd, m); | IFQ_UNLOCK(\*[Am]ifp-\*[Gt]if_snd);
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IF_PREPEND(&ifp->if_snd, m); | IFQ_UNLOCK(&ifp->if_snd);
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return; | return;
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} | }
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||||
|
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@ -493,8 +502,8 @@ You have to convert the logic into poll-and-dequeue.
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| * is committed to send this
|
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| * packet.
|
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| */
|
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| IFQ_DEQUEUE_NOLOCK(\*[Am]ifp-\*[Gt]if_snd, m);
|
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| IFQ_UNLOCK(\*[Am]ifp-\*[Gt]if_snd);
|
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| IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
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| IFQ_UNLOCK(&ifp->if_snd);
|
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|
|
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/* kick the hardware */ | /* kick the hardware */
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} | }
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||||
@ -508,24 +517,24 @@ Note that a non-work conserving queue cannot be emptied by a dequeue loop.
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.Bd -literal
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##old-style## ##new-style##
|
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|
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while (ifp-\*[Gt]if_snd.ifq_head != NULL) {| IFQ_PURGE(\*[Am]ifp-\*[Gt]if_snd);
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IF_DEQUEUE(\*[Am]ifp-\*[Gt]if_snd, m); |
|
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while (ifp->if_snd.ifq_head != NULL) {| IFQ_PURGE(&ifp->if_snd);
|
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IF_DEQUEUE(&ifp->if_snd, m); |
|
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m_freem(m); |
|
||||
} |
|
||||
|
|
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.Ed
|
||||
.Ss Conversion using a driver managed queue
|
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Convert
|
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.Fn IF_XXX
|
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.Fn IF_*
|
||||
macros to their equivalent
|
||||
.Fn IFQ_DRV_XXX
|
||||
.Fn IFQ_DRV_*
|
||||
and employ
|
||||
.Fn IFQ_DRV_IS_EMPTY
|
||||
where appropriate
|
||||
where appropriate.
|
||||
.Bd -literal
|
||||
##old-style## ##new-style##
|
||||
|
|
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if (ifp-\*[Gt]if_snd.ifq_head != NULL) | if (!IFQ_DRV_IS_EMPTY(\*[Am]ifp-\*[Gt]if_snd))
|
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if (ifp->if_snd.ifq_head != NULL) | if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
|
||||
|
|
||||
.Ed
|
||||
Make sure that calls to
|
||||
@ -543,13 +552,13 @@ might also be appropriate.
|
||||
Use
|
||||
.Fn IFQ_SET_MAXLEN
|
||||
to set
|
||||
.Fa ifq_maxlen
|
||||
.Va ifq_maxlen
|
||||
to
|
||||
.Fa len .
|
||||
Initialize
|
||||
.Va ifq_drv_maxlen
|
||||
with a sensible value if you plan to use the
|
||||
.Fn IFQ_DRV_XXX
|
||||
.Fn IFQ_DRV_*
|
||||
macros.
|
||||
Add
|
||||
.Fn IFQ_SET_READY
|
||||
@ -558,9 +567,9 @@ to show this driver is converted to the new style.
|
||||
.Bd -literal
|
||||
##old-style## ##new-style##
|
||||
|
|
||||
ifp-\*[Gt]if_snd.ifq_maxlen = qsize; | IFQ_SET_MAXLEN(\*[Am]ifp-\*[Gt]if_snd, qsize);
|
||||
| ifp-\*[Gt]if_snd.ifq_drv_maxlen = qsize;
|
||||
| IFQ_SET_READY(\*[Am]ifp-\*[Gt]if_snd);
|
||||
ifp->if_snd.ifq_maxlen = qsize; | IFQ_SET_MAXLEN(&ifp->if_snd, qsize);
|
||||
| ifp->if_snd.ifq_drv_maxlen = qsize;
|
||||
| IFQ_SET_READY(&ifp->if_snd);
|
||||
if_attach(ifp); | if_attach(ifp);
|
||||
|
|
||||
.Ed
|
||||
@ -569,27 +578,25 @@ The new macros for statistics:
|
||||
.Bd -literal
|
||||
##old-style## ##new-style##
|
||||
|
|
||||
IF_DROP(\*[Am]ifp-\*[Gt]if_snd); | IFQ_INC_DROPS(\*[Am]ifp-\*[Gt]if_snd);
|
||||
IF_DROP(&ifp->if_snd); | IFQ_INC_DROPS(&ifp->if_snd);
|
||||
|
|
||||
ifp-\*[Gt]if_snd.ifq_len++; | IFQ_INC_LEN(\*[Am]ifp-\*[Gt]if_snd);
|
||||
ifp->if_snd.ifq_len++; | IFQ_INC_LEN(&ifp->if_snd);
|
||||
|
|
||||
ifp-\*[Gt]if_snd.ifq_len--; | IFQ_DEC_LEN(\*[Am]ifp-\*[Gt]if_snd);
|
||||
ifp->if_snd.ifq_len--; | IFQ_DEC_LEN(&ifp->if_snd);
|
||||
|
|
||||
.Ed
|
||||
.Sh QUEUING DISCIPLINES
|
||||
Queuing disciplines need to maintain
|
||||
.Fa ifq_len
|
||||
.Po
|
||||
used by
|
||||
.Fn IFQ_IS_EMPTY
|
||||
.Pc .
|
||||
Queuing disciplines also need to guarantee the same mbuf is returned if
|
||||
(used by
|
||||
.Fn IFQ_IS_EMPTY ) .
|
||||
Queuing disciplines also need to guarantee that the same mbuf is returned if
|
||||
.Fn IFQ_DEQUEUE
|
||||
is called immediately after
|
||||
.Fn IFQ_POLL .
|
||||
.Sh SEE ALSO
|
||||
.Xr pf 4 ,
|
||||
.Xr pf.conf 5
|
||||
.Xr pf.conf 5 ,
|
||||
.Xr pfctl 8
|
||||
.Sh HISTORY
|
||||
The
|
||||
|
Loading…
Reference in New Issue
Block a user