9d3148406c
Squashed commit of the following:
Fix up some final compile isses.
net/netdev: Convert the network down notification logic to use the new wqueue-based notification factility.
net/udp: Convert the UDP readahead notification logic to use the new wqueue-based notification factility.
net/tcp: Convert the TCP readahead notification logic to use the new wqueue-based notification factility.
mm/iob: Convert the IOB notification logic to use the new wqueue-based notification factility.
sched/wqueue: Signals are not good IPCs to support the target poll functionality for several reasons including the amount of data that can be passed with a signal and in the fact that in protected and kernel modes, user threads executing signal handlers in protected, kernel memory is problematic. Instead, convert the same logic to perform the notifications via function callback on the high priority work queue.
88 lines
3.0 KiB
Plaintext
88 lines
3.0 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menu "Common I/O Buffer Support"
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config MM_IOB
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bool "Enable generic I/O buffer support"
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default n
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---help---
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This setting will build the common I/O buffer (IOB) support
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library.
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if MM_IOB
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config IOB_NBUFFERS
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int "Number of pre-allocated I/O buffers"
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default 24 if (NET_WRITE_BUFFERS && !NET_READAHEAD) || (!NET_WRITE_BUFFERS && NET_READAHEAD)
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default 36 if NET_WRITE_BUFFERS && NET_READAHEAD
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default 8 if !NET_WRITE_BUFFERS && !NET_READAHEAD
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---help---
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Each packet is represented by a series of small I/O buffers in a
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chain. This setting determines the number of preallocated I/O
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buffers available for packet data.
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config IOB_BUFSIZE
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int "Payload size of one I/O buffer"
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default 196
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---help---
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Each packet is represented by a series of small I/O buffers in a
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chain. This setting determines the data payload each preallocated
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I/O buffer.
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config IOB_NCHAINS
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int "Number of pre-allocated I/O buffer chain heads"
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default 0 if !NET_READAHEAD && !NET_UDP_READAHEAD
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default 8 if NET_READAHEAD || NET_UDP_READAHEAD
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---help---
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These tiny nodes are used as "containers" to support queueing of
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I/O buffer chains. This will limit the number of I/O transactions
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that can be "in-flight" at any give time. The default value of
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zero disables this features.
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These generic I/O buffer chain containers are not currently used
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by any logic in NuttX. That is because their other other specialized
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I/O buffer chain containers that also carry a payload of usage
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specific information.
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config IOB_THROTTLE
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int "I/O buffer throttle value"
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default 0 if !NET_WRITE_BUFFERS || !NET_READAHEAD
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default 8 if NET_WRITE_BUFFERS && NET_READAHEAD
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---help---
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TCP write buffering and read-ahead buffer use the same pool of free
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I/O buffers. In order to prevent uncontrolled incoming TCP packets
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from hogging all of the available, pre-allocated I/O buffers, a
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throttling value is required. This throttle value assures that
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I/O buffers will be denied to the read-ahead logic before TCP writes
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are halted.
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config IOB_NOTIFIER
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bool "Support IOB notifications"
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default n
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depends on SCHED_HPWORK
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---help---
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Enable building of IOB notifier logic that will execute a worker
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function on the high priority work queue when an IOB is available.
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This is is a general purpose notifier, but was developed specifically to
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support poll() logic where the poll must wait for an IOB to become
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available.
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config IOB_DEBUG
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bool "Force I/O buffer debug"
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default n
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depends on DEBUG_FEATURES && !SYSLOG_BUFFER
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---help---
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This option will force debug output from I/O buffer logic. This
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is not normally something that would want to do but is convenient
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if you are debugging the I/O buffer logic and do not want to get
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overloaded with other un-related debug output.
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NOTE that this selection is not available if IOBs are being used
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to syslog buffering logic (CONFIG_SYSLOG_BUFFER=y)!
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endif # MM_IOB
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endmenu # Common I/O buffer support
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