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/linux-5.10/Documentation/devicetree/bindings/misc/
Dintel,ixp4xx-ahb-queue-manager.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
4 ---
5 $id: "http://devicetree.org/schemas/misc/intel,ixp4xx-ahb-queue-manager.yaml#"
6 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
8 title: Intel IXP4xx AHB Queue Manager
11 - Linus Walleij <linus.walleij@linaro.org>
14 The IXP4xx AHB Queue Manager maintains queues as circular buffers in
18 queues from the queue manager with foo-queue = <&qmgr N> where the
19 &qmgr is a phandle to the queue manager and N is the queue resource
20 number. The queue resources available and their specific purpose
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/linux-5.10/tools/bpf/bpftool/Documentation/
Dbpftool-map.rst2 bpftool-map
4 -------------------------------------------------------------------------------
6 -------------------------------------------------------------------------------
15 *OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
53 | | **queue** | **stack** | **sk_storage** | **struct_ops** | **ringbuf** | **inode_storage** }
79 To create maps of type array-of-maps or hash-of-maps, the
137 Peek next value in the queue or stack.
146 Enqueue *VALUE* into the queue.
149 Dequeue and print value from the queue.
152 Freeze the map as read-only from user space. Entries from a
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/linux-5.10/tools/perf/Documentation/
Dperf-config.txt1 perf-config(1)
5 ----
6 perf-config - Get and set variables in a configuration file.
9 --------
11 'perf config' [<file-option>] [section.name[=value] ...]
13 'perf config' [<file-option>] -l | --list
16 -----------
20 -------
22 -l::
23 --list::
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/linux-5.10/drivers/net/wireless/ath/
Dath.h2 * Copyright (c) 2008-2009 Atheros Communications Inc.
30 * and station state to short-circuit node lookups on rx.
117 * struct ath_ops - Register read/write operations
191 return common->ps_ops; in ath_ps_ops()
229 * enum ath_debug_level - atheros wireless debug level
232 * @ATH_DBG_QUEUE: hardware queue management
247 * used exclusively for WLAN-BT coexistence starting from
257 * modifying debug level states -- but this is typically done through a
293 if ((common)->debug_mask & ATH_DBG_##dbg_mask) \
297 #define ATH_DBG_WARN(foo, arg...) WARN(foo, arg) argument
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/linux-5.10/tools/testing/selftests/tc-testing/tc-tests/qdiscs/
Dfifo.json5 …"__comment": "When omitted, queue size in bfifo is calculated as: txqueuelen * (MTU + LinkLayerHdr…
16 "matchPattern": "qdisc bfifo 1: root.*limit [0-9]+b",
26 …"__comment": "When omitted, queue size in pfifo is defaulted to the interface's txqueuelen value.",
37 "matchPattern": "qdisc pfifo 1: root.*limit [0-9]+p",
57 "matchPattern": "qdisc bfifo ffff: root.*limit [0-9]+b",
66 "name": "Add bfifo qdisc on egress with queue size of 3000 bytes",
86 "name": "Add pfifo qdisc on egress with queue size of 3000 packets",
117 "matchPattern": "qdisc bfifo 10000: root.*limit [0-9]+b",
163 "name": "Replace bfifo qdisc on egress with new queue size",
185 "name": "Replace pfifo qdisc on egress with new queue size",
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/linux-5.10/Documentation/power/
Druntime_pm.rst5 (C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
18 put their PM-related work items. It is strongly recommended that pm_wq be
20 them to be synchronized with system-wide power transitions (suspend to RAM,
53 The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks
57 1. PM domain of the device, if the device's PM domain object, dev->pm_domain,
60 2. Device type of the device, if both dev->type and dev->type->pm are present.
62 3. Device class of the device, if both dev->class and dev->class->pm are
65 4. Bus type of the device, if both dev->bus and dev->bus->pm are present.
69 dev->driver->pm directly (if present).
73 and bus type. Moreover, the high-priority one will always take precedence over
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/linux-5.10/Documentation/filesystems/
Dinotify.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Inotify - A Powerful yet Simple File Change Notification System
13 - Deleted obsoleted interface, just refer to manpages for user interface.
29 What is the design decision behind using an-fd-per-instance as opposed to
30 an fd-per-watch?
33 An fd-per-watch quickly consumes more file descriptors than are allowed,
35 select()-able. Yes, root can bump the per-process fd limit and yes, users
38 spaces is thus sensible. The current design is what user-space developers
41 thousand times is silly. If we can implement user-space's preferences
42 cleanly--and we can, the idr layer makes stuff like this trivial--then we
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/linux-5.10/Documentation/networking/
Dsnmp_counter.rst17 .. _RFC1213 ipInReceives: https://tools.ietf.org/html/rfc1213#page-26
30 .. _RFC1213 ipInDelivers: https://tools.ietf.org/html/rfc1213#page-28
41 .. _RFC1213 ipOutRequests: https://tools.ietf.org/html/rfc1213#page-28
60 .. _Explicit Congestion Notification: https://tools.ietf.org/html/rfc3168#page-6
73 .. _RFC1213 ipInHdrErrors: https://tools.ietf.org/html/rfc1213#page-27
81 .. _RFC1213 ipInAddrErrors: https://tools.ietf.org/html/rfc1213#page-27
98 .. _RFC1213 ipInUnknownProtos: https://tools.ietf.org/html/rfc1213#page-27
111 .. _RFC1213 ipInDiscards: https://tools.ietf.org/html/rfc1213#page-28
118 .. _RFC1213 ipOutDiscards: https://tools.ietf.org/html/rfc1213#page-28
125 .. _RFC1213 ipOutNoRoutes: https://tools.ietf.org/html/rfc1213#page-29
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Dfilter.rst1 .. SPDX-License-Identifier: GPL-2.0
3 .. _networking-filter:
10 ------------
17 BPF allows a user-space program to attach a filter onto any socket and
42 The biggest user of this construct might be libpcap. Issuing a high-level
43 filter command like `tcpdump -i em1 port 22` passes through the libpcap
45 via SO_ATTACH_FILTER to the kernel. `tcpdump -i em1 port 22 -ddd`
50 qdisc layer, SECCOMP-BPF (SECure COMPuting [1]_), and lots of other places
53 .. [1] Documentation/userspace-api/seccomp_filter.rst
58 architecture for user-level packet capture. In Proceedings of the
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/linux-5.10/net/sunrpc/
Drpc_pipe.c1 // SPDX-License-Identifier: GPL-2.0-only
72 msg = list_entry(head->next, struct rpc_pipe_msg, list); in rpc_purge_list()
73 list_del_init(&msg->list); in rpc_purge_list()
74 msg->errno = err; in rpc_purge_list()
91 spin_lock(&pipe->lock); in rpc_timeout_upcall_queue()
92 destroy_msg = pipe->ops->destroy_msg; in rpc_timeout_upcall_queue()
93 if (pipe->nreaders == 0) { in rpc_timeout_upcall_queue()
94 list_splice_init(&pipe->pipe, &free_list); in rpc_timeout_upcall_queue()
95 pipe->pipelen = 0; in rpc_timeout_upcall_queue()
97 dentry = dget(pipe->dentry); in rpc_timeout_upcall_queue()
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/linux-5.10/ipc/
Dmqueue.c69 * Accesses to a message queue are synchronized by acquiring info->lock.
72 * - The actual wakeup of a sleeping task is performed using the wake_q
73 * framework. info->lock is already released when wake_up_q is called.
74 * - The exit codepaths after sleeping check ext_wait_queue->state without
76 * acquiring info->lock.
93 * ->state = STATE_READY (reordered)
101 * the smp_store_release() that does ->state = STATE_READY.
115 * receiver->msg = message; (reordered)
119 * 3) There is intentionally no barrier when setting current->state
120 * to TASK_INTERRUPTIBLE: spin_unlock(&info->lock) provides the
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/linux-5.10/kernel/locking/
Drtmutex.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * RT-Mutexes: simple blocking mutual exclusion locks with PI support
7 * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
8 * Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
12 * See Documentation/locking/rt-mutex-design.rst for details.
26 * lock->owner state tracking:
28 * lock->owner holds the task_struct pointer of the owner. Bit 0
39 * possible when bit 0 of lock->owner is 0.
42 * with ->wait_lock is held. To prevent any fast path cmpxchg to the lock,
60 WRITE_ONCE(lock->owner, (struct task_struct *)val); in rt_mutex_set_owner()
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/linux-5.10/net/unix/
Dgarbage.c1 // SPDX-License-Identifier: GPL-2.0-or-later
13 * - object w/ a bit
14 * - free list
18 * - explicit stack instead of recursion
19 * - tail recurse on first born instead of immediate push/pop
20 * - we gather the stuff that should not be killed into tree
25 * - don't just push entire root set; process in place
32 * of foo to bar and vice versa. Current code chokes on that.
38 * upon the beginning and unmark non-junk ones.
56 * parents (->gc_tree).
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/linux-5.10/include/linux/device/
Dbus.h1 // SPDX-License-Identifier: GPL-2.0
3 * bus.h - the bus-specific portions of the driver model
5 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
6 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2008-2009 Novell Inc.
8 * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 * Copyright (c) 2012-2019 Linux Foundation
11 * See Documentation/driver-api/driver-model/ for more information.
25 * struct bus_type - The bus type of the device
28 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
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/linux-5.10/net/ipv4/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
40 so-called IP spoofing, however it can pose problems if you use
42 than packets from that host to you) or if you operate a non-routing
52 <file:Documentation/networking/ip-sysctl.rst>.
71 address into account. Furthermore, the TOS (Type-Of-Service) field
89 equal "cost" and chooses one of them in a non-deterministic fashion
132 <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
147 Read <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
160 <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
173 mobile-IP facilities (allowing laptops to seamlessly move between
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Dip_output.c1 // SPDX-License-Identifier: GPL-2.0-only
39 * silently drop skb instead of failing with -EPERM.
79 #include <linux/bpf-cgroup.h>
94 iph->check = 0; in ip_send_check()
95 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); in ip_send_check()
103 iph->tot_len = htons(skb->len); in __ip_local_out()
113 skb->protocol = htons(ETH_P_IP); in __ip_local_out()
116 net, sk, skb, NULL, skb_dst(skb)->dev, in __ip_local_out()
134 int ttl = inet->uc_ttl; in ip_select_ttl()
155 skb_push(skb, sizeof(struct iphdr) + (opt ? opt->opt.optlen : 0)); in ip_build_and_send_pkt()
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/linux-5.10/Documentation/core-api/
Datomic_ops.rst23 See :ref:`Documentation/process/volatile-considered-harmful.rst
28 :ref:`Documentation/core-api/local_ops.rst <local_ops>` for the semantics of
35 #define atomic_set(v, i) ((v)->counter = (i))
52 struct foo { atomic_t counter; };
55 struct foo *k;
59 return -ENOMEM;
60 atomic_set(&k->counter, 0);
70 #define atomic_read(v) ((v)->counter)
179 Don't even -think- about doing this without proper use of memory barriers,
305 Preceding a non-value-returning read-modify-write atomic operation with
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Ddma-api-howto.rst10 with example pseudo-code. For a concise description of the API, see
11 DMA-API.txt.
39 supports 64-bit addresses for main memory and PCI BARs, it may use an IOMMU
40 so devices only need to use 32-bit DMA addresses.
49 +-------+ +------+ +------+
52 C +-------+ --------> B +------+ ----------> +------+ A
54 +-----+ | | | | bridge | | +--------+
55 | | | | +------+ | | | |
58 +-----+ +-------+ +------+ +------+ +--------+
60 X +-------+ --------> Y +------+ <---------- +------+ Z
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/linux-5.10/fs/
Dblock_dev.c1 // SPDX-License-Identifier: GPL-2.0-only
18 #include <linux/backing-dev.h>
53 return &BDEV_I(inode)->bdev; in I_BDEV()
59 struct inode *inode = bdev->bd_inode; in bdev_write_inode()
62 spin_lock(&inode->i_lock); in bdev_write_inode()
63 while (inode->i_state & I_DIRTY) { in bdev_write_inode()
64 spin_unlock(&inode->i_lock); in bdev_write_inode()
72 spin_lock(&inode->i_lock); in bdev_write_inode()
74 spin_unlock(&inode->i_lock); in bdev_write_inode()
80 struct address_space *mapping = bdev->bd_inode->i_mapping; in kill_bdev()
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/linux-5.10/include/linux/
Dnetdevice.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
13 * Corey Minyard <wf-rch!minyard@relay.EU.net>
87 * - qdisc return codes
88 * - driver transmit return codes
89 * - errno values
93 * the driver transmit return codes though - when qdiscs are used, the actual
100 /* qdisc ->enqueue() return codes. */
110 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
130 * - successful transmission (rc == NETDEV_TX_OK) in dev_xmit_complete()
131 * - error while transmitting (rc < 0) in dev_xmit_complete()
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/linux-5.10/drivers/net/ethernet/nvidia/
Dforcedeth.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * engineered documentation written by Carl-Daniel Hailfinger
15 * Copyright (C) 2004 Carl-Daniel Hailfinger (invalid MAC handling, insane
50 #include <linux/dma-mapping.h>
73 #define DEV_HAS_MSI_X 0x0000080 /* device supports MSI-X */
483 * - DESC_VER_1: Original
484 * - DESC_VER_2: support for jumbo frames.
485 * - DESC_VER_3: 64-bit format.
568 /* MSI/MSI-X defines */
638 u64 tx_bytes; /* should be ifconfig->tx_bytes + 4*tx_packets */
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/linux-5.10/fs/btrfs/
Dinode.c1 // SPDX-License-Identifier: GPL-2.0
16 #include <linux/backing-dev.h>
37 #include "disk-io.h"
40 #include "print-tree.h"
41 #include "ordered-data.h"
43 #include "tree-log.h"
47 #include "free-space-cache.h"
48 #include "inode-map.h"
51 #include "delalloc-space.h"
52 #include "block-group.h"
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/linux-5.10/Documentation/
Dmemory-barriers.txt19 documentation at tools/memory-model/. Nevertheless, even this memory
37 Note also that it is possible that a barrier may be a no-op for an
48 - Device operations.
49 - Guarantees.
53 - Varieties of memory barrier.
54 - What may not be assumed about memory barriers?
55 - Data dependency barriers (historical).
56 - Control dependencies.
57 - SMP barrier pairing.
58 - Examples of memory barrier sequences.
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/linux-5.10/Documentation/translations/ko_KR/
Dmemory-barriers.txt2 This is a version of Documentation/memory-barriers.txt translated into Korean.
15 Documentation/memory-barriers.txt
39 일부 이상한 점들은 공식적인 메모리 일관성 모델과 tools/memory-model/ 에 있는
60 해당 배리어의 명시적 사용이 불필요해서 no-op 이 될수도 있음을 알아두시기
76 - 디바이스 오퍼레이션.
77 - 보장사항.
81 - 메모리 배리어의 종류.
82 - 메모리 배리어에 대해 가정해선 안될 것.
83 - 데이터 의존성 배리어 (역사적).
84 - 컨트롤 의존성.
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/linux-5.10/drivers/atm/
Deni.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
41 * - OAM support
42 * - fix bugs listed below
48 * - may run into JK-JK bug and deadlock
49 * - should allocate UBR channel first
50 * - buffer space allocation algorithm is stupid
53 * - doesn't support OAM cells
54 * - eni_put_free may hang if not putting memory fragments that _complete_
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