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Update netisr comment for the SMPng world order: netisr is no longer

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implemented using the ISR facility, and cannot be triggered by calling
splnet()/splx().

MFC after:	3 weeks
This commit is contained in:
rwatson 2007-12-31 20:58:50 +00:00
parent d317da326d
commit 72360ebb8e
1 changed files with 8 additions and 13 deletions
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21
sys/net/netisr.h
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@ -34,19 +34,15 @@
#define _NET_NETISR_H_
/*
* The networking code runs off software interrupts.
* The netisr (network interrupt service routine) provides a deferred
* execution evironment in which (generally inbound) network processing can
* take place. Protocols register handlers and, optionally, packet queues;
* when packets are delivered to the queue, the protocol handler will be
* executed directly, or via deferred dispatch depending on the
* circumstances.
*
* You can switch into the network by doing splnet() and return by splx().
* The software interrupt level for the network is higher than the software
* level for the clock (so you can enter the network in routines called
* at timeout time).
*/
/*
* Each ``pup-level-1'' input queue has a bit in a ``netisr'' status
* word which is used to de-multiplex a single software
* interrupt used for scheduling the network code to calls
* on the lowest level routine of each protocol.
* Historically, this was implemented by the BSD software ISR facility; it is
* now implemented via a software ithread (SWI).
*/
#define NETISR_POLL 0 /* polling callback, must be first */
#define NETISR_IP 2 /* same as AF_INET */
@ -64,7 +60,6 @@
#define NETISR_NETGRAPH 30
#define NETISR_POLLMORE 31 /* polling callback, must be last */
#ifndef LOCORE
#ifdef _KERNEL