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net/dccp/ccids/ccid2.c:190: warning: Function parameter or member 'hc' not described in 'ccid2_update_used_window' net/dccp/ccids/ccid2.c:190: warning: Function parameter or member 'new_wnd' not described in 'ccid2_update_used_window' net/dccp/ccids/ccid2.c:360: warning: Function parameter or member 'sk' not described in 'ccid2_rtt_estimator' net/dccp/ccids/ccid3.c:112: warning: Function parameter or member 'sk' not described in 'ccid3_hc_tx_update_x' net/dccp/ccids/ccid3.c:159: warning: Function parameter or member 'hc' not described in 'ccid3_hc_tx_update_s' net/dccp/ccids/ccid3.c:268: warning: Function parameter or member 'sk' not described in 'ccid3_hc_tx_send_packet' net/dccp/ccids/ccid3.c:667: warning: Function parameter or member 'sk' not described in 'ccid3_first_li' net/dccp/ccids/ccid3.c:85: warning: Function parameter or member 'hc' not described in 'ccid3_update_send_interval' net/dccp/ccids/lib/loss_interval.c:85: warning: Function parameter or member 'lh' not described in 'tfrc_lh_update_i_mean' net/dccp/ccids/lib/loss_interval.c:85: warning: Function parameter or member 'skb' not described in 'tfrc_lh_update_i_mean' net/dccp/ccids/lib/packet_history.c:392: warning: Function parameter or member 'h' not described in 'tfrc_rx_hist_sample_rtt' net/dccp/ccids/lib/packet_history.c:392: warning: Function parameter or member 'skb' not described in 'tfrc_rx_hist_sample_rtt' net/dccp/feat.c:1003: warning: Function parameter or member 'dreq' not described in 'dccp_feat_server_ccid_dependencies' net/dccp/feat.c:1040: warning: Function parameter or member 'array_len' not described in 'dccp_feat_prefer' net/dccp/feat.c:1040: warning: Function parameter or member 'array' not described in 'dccp_feat_prefer' net/dccp/feat.c:1040: warning: Function parameter or member 'preferred_value' not described in 'dccp_feat_prefer' net/dccp/output.c:151: warning: Function parameter or member 'dp' not described in 'dccp_determine_ccmps' net/dccp/output.c:242: warning: Function parameter or member 'sk' not described in 'dccp_xmit_packet' net/dccp/output.c:305: warning: Function parameter or member 'sk' not described in 'dccp_flush_write_queue' net/dccp/output.c:305: warning: Function parameter or member 'time_budget' not described in 'dccp_flush_write_queue' net/dccp/output.c:378: warning: Function parameter or member 'sk' not described in 'dccp_retransmit_skb' net/dccp/qpolicy.c:88: warning: Function parameter or member '' not described in 'dccp_qpolicy_operations' net/dccp/qpolicy.c:88: warning: Function parameter or member '{' not described in 'dccp_qpolicy_operations' net/dccp/qpolicy.c:88: warning: Function parameter or member 'params' not described in 'dccp_qpolicy_operations' Signed-off-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20201028011412.931250-1-andrew@lunn.ch Signed-off-by: Jakub Kicinski <kuba@kernel.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* net/dccp/qpolicy.c
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*
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* Policy-based packet dequeueing interface for DCCP.
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*
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* Copyright (c) 2008 Tomasz Grobelny <tomasz@grobelny.oswiecenia.net>
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*/
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#include "dccp.h"
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/*
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* Simple Dequeueing Policy:
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* If tx_qlen is different from 0, enqueue up to tx_qlen elements.
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*/
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static void qpolicy_simple_push(struct sock *sk, struct sk_buff *skb)
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{
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skb_queue_tail(&sk->sk_write_queue, skb);
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}
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static bool qpolicy_simple_full(struct sock *sk)
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{
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return dccp_sk(sk)->dccps_tx_qlen &&
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sk->sk_write_queue.qlen >= dccp_sk(sk)->dccps_tx_qlen;
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}
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static struct sk_buff *qpolicy_simple_top(struct sock *sk)
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{
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return skb_peek(&sk->sk_write_queue);
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}
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/*
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* Priority-based Dequeueing Policy:
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* If tx_qlen is different from 0 and the queue has reached its upper bound
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* of tx_qlen elements, replace older packets lowest-priority-first.
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*/
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static struct sk_buff *qpolicy_prio_best_skb(struct sock *sk)
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{
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struct sk_buff *skb, *best = NULL;
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skb_queue_walk(&sk->sk_write_queue, skb)
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if (best == NULL || skb->priority > best->priority)
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best = skb;
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return best;
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}
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static struct sk_buff *qpolicy_prio_worst_skb(struct sock *sk)
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{
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struct sk_buff *skb, *worst = NULL;
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skb_queue_walk(&sk->sk_write_queue, skb)
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if (worst == NULL || skb->priority < worst->priority)
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worst = skb;
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return worst;
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}
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static bool qpolicy_prio_full(struct sock *sk)
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{
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if (qpolicy_simple_full(sk))
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dccp_qpolicy_drop(sk, qpolicy_prio_worst_skb(sk));
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return false;
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}
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/**
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* struct dccp_qpolicy_operations - TX Packet Dequeueing Interface
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* @push: add a new @skb to the write queue
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* @full: indicates that no more packets will be admitted
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* @top: peeks at whatever the queueing policy defines as its `top'
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* @params: parameter passed to policy operation
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*/
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struct dccp_qpolicy_operations {
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void (*push) (struct sock *sk, struct sk_buff *skb);
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bool (*full) (struct sock *sk);
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struct sk_buff* (*top) (struct sock *sk);
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__be32 params;
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};
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static struct dccp_qpolicy_operations qpol_table[DCCPQ_POLICY_MAX] = {
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[DCCPQ_POLICY_SIMPLE] = {
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.push = qpolicy_simple_push,
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.full = qpolicy_simple_full,
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.top = qpolicy_simple_top,
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.params = 0,
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},
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[DCCPQ_POLICY_PRIO] = {
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.push = qpolicy_simple_push,
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.full = qpolicy_prio_full,
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.top = qpolicy_prio_best_skb,
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.params = DCCP_SCM_PRIORITY,
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},
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};
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/*
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* Externally visible interface
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*/
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void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb)
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{
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qpol_table[dccp_sk(sk)->dccps_qpolicy].push(sk, skb);
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}
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bool dccp_qpolicy_full(struct sock *sk)
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{
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return qpol_table[dccp_sk(sk)->dccps_qpolicy].full(sk);
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}
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void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb)
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{
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if (skb != NULL) {
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skb_unlink(skb, &sk->sk_write_queue);
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kfree_skb(skb);
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}
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}
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struct sk_buff *dccp_qpolicy_top(struct sock *sk)
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{
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return qpol_table[dccp_sk(sk)->dccps_qpolicy].top(sk);
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}
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struct sk_buff *dccp_qpolicy_pop(struct sock *sk)
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{
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struct sk_buff *skb = dccp_qpolicy_top(sk);
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if (skb != NULL) {
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/* Clear any skb fields that we used internally */
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skb->priority = 0;
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skb_unlink(skb, &sk->sk_write_queue);
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}
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return skb;
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}
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bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param)
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{
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/* check if exactly one bit is set */
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if (!param || (param & (param - 1)))
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return false;
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return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param;
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}
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