27a884dc3c
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)
Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/*
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* net/core/gen_stats.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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* Jamal Hadi Salim
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* See Documentation/networking/gen_stats.txt
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/socket.h>
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#include <linux/rtnetlink.h>
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#include <linux/gen_stats.h>
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#include <net/gen_stats.h>
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static inline int
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gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
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{
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RTA_PUT(d->skb, type, size, buf);
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return 0;
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rtattr_failure:
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spin_unlock_bh(d->lock);
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return -1;
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}
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/**
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* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
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* @skb: socket buffer to put statistics TLVs into
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* @type: TLV type for top level statistic TLV
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* @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
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* @xstats_type: TLV type for backward compatibility xstats TLV
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* @lock: statistics lock
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* @d: dumping handle
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*
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* Initializes the dumping handle, grabs the statistic lock and appends
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* an empty TLV header to the socket buffer for use a container for all
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* other statistic TLVS.
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*
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* The dumping handle is marked to be in backward compatibility mode telling
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* all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
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*
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* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
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int xstats_type, spinlock_t *lock, struct gnet_dump *d)
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{
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memset(d, 0, sizeof(*d));
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spin_lock_bh(lock);
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d->lock = lock;
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if (type)
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d->tail = (struct rtattr *)skb_tail_pointer(skb);
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d->skb = skb;
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d->compat_tc_stats = tc_stats_type;
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d->compat_xstats = xstats_type;
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if (d->tail)
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return gnet_stats_copy(d, type, NULL, 0);
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return 0;
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}
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/**
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* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
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* @skb: socket buffer to put statistics TLVs into
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* @type: TLV type for top level statistic TLV
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* @lock: statistics lock
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* @d: dumping handle
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*
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* Initializes the dumping handle, grabs the statistic lock and appends
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* an empty TLV header to the socket buffer for use a container for all
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* other statistic TLVS.
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*
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* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
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struct gnet_dump *d)
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{
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return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
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}
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/**
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* gnet_stats_copy_basic - copy basic statistics into statistic TLV
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* @d: dumping handle
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* @b: basic statistics
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*
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* Appends the basic statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b)
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{
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if (d->compat_tc_stats) {
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d->tc_stats.bytes = b->bytes;
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d->tc_stats.packets = b->packets;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b));
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return 0;
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}
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/**
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* gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
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* @d: dumping handle
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* @r: rate estimator statistics
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*
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* Appends the rate estimator statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
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{
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if (d->compat_tc_stats) {
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d->tc_stats.bps = r->bps;
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d->tc_stats.pps = r->pps;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
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return 0;
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}
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/**
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* gnet_stats_copy_queue - copy queue statistics into statistics TLV
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* @d: dumping handle
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* @q: queue statistics
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*
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* Appends the queue statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
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{
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if (d->compat_tc_stats) {
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d->tc_stats.drops = q->drops;
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d->tc_stats.qlen = q->qlen;
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d->tc_stats.backlog = q->backlog;
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d->tc_stats.overlimits = q->overlimits;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
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return 0;
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}
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/**
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* gnet_stats_copy_app - copy application specific statistics into statistics TLV
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* @d: dumping handle
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* @st: application specific statistics data
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* @len: length of data
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*
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* Appends the application sepecific statistics to the top level TLV created by
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* gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
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* handle is in backward compatibility mode.
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
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{
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if (d->compat_xstats) {
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d->xstats = st;
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d->xstats_len = len;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_APP, st, len);
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return 0;
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}
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/**
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* gnet_stats_finish_copy - finish dumping procedure
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* @d: dumping handle
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*
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* Corrects the length of the top level TLV to include all TLVs added
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* by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
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* if gnet_stats_start_copy_compat() was used and releases the statistics
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* lock.
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_finish_copy(struct gnet_dump *d)
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{
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if (d->tail)
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d->tail->rta_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
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if (d->compat_tc_stats)
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if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
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sizeof(d->tc_stats)) < 0)
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return -1;
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if (d->compat_xstats && d->xstats) {
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if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
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d->xstats_len) < 0)
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return -1;
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}
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spin_unlock_bh(d->lock);
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return 0;
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}
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EXPORT_SYMBOL(gnet_stats_start_copy);
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EXPORT_SYMBOL(gnet_stats_start_copy_compat);
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EXPORT_SYMBOL(gnet_stats_copy_basic);
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EXPORT_SYMBOL(gnet_stats_copy_rate_est);
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EXPORT_SYMBOL(gnet_stats_copy_queue);
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EXPORT_SYMBOL(gnet_stats_copy_app);
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EXPORT_SYMBOL(gnet_stats_finish_copy);
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