From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- net/core/gen_stats.c | 239 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 239 insertions(+) create mode 100644 net/core/gen_stats.c (limited to 'net/core/gen_stats.c') diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c new file mode 100644 index 000000000000..8f21490355fa --- /dev/null +++ b/net/core/gen_stats.c @@ -0,0 +1,239 @@ +/* + * net/core/gen_stats.c + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Thomas Graf + * Jamal Hadi Salim + * Alexey Kuznetsov, + * + * See Documentation/networking/gen_stats.txt + */ + +#include +#include +#include +#include +#include +#include +#include +#include + + +static inline int +gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size) +{ + RTA_PUT(d->skb, type, size, buf); + return 0; + +rtattr_failure: + spin_unlock_bh(d->lock); + return -1; +} + +/** + * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode + * @skb: socket buffer to put statistics TLVs into + * @type: TLV type for top level statistic TLV + * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV + * @xstats_type: TLV type for backward compatibility xstats TLV + * @lock: statistics lock + * @d: dumping handle + * + * Initializes the dumping handle, grabs the statistic lock and appends + * an empty TLV header to the socket buffer for use a container for all + * other statistic TLVS. + * + * The dumping handle is marked to be in backward compatibility mode telling + * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. + * + * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, + int xstats_type, spinlock_t *lock, struct gnet_dump *d) +{ + memset(d, 0, sizeof(*d)); + + spin_lock_bh(lock); + d->lock = lock; + if (type) + d->tail = (struct rtattr *) skb->tail; + d->skb = skb; + d->compat_tc_stats = tc_stats_type; + d->compat_xstats = xstats_type; + + if (d->tail) + return gnet_stats_copy(d, type, NULL, 0); + + return 0; +} + +/** + * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode + * @skb: socket buffer to put statistics TLVs into + * @type: TLV type for top level statistic TLV + * @lock: statistics lock + * @d: dumping handle + * + * Initializes the dumping handle, grabs the statistic lock and appends + * an empty TLV header to the socket buffer for use a container for all + * other statistic TLVS. + * + * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, + struct gnet_dump *d) +{ + return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); +} + +/** + * gnet_stats_copy_basic - copy basic statistics into statistic TLV + * @d: dumping handle + * @b: basic statistics + * + * Appends the basic statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b) +{ + if (d->compat_tc_stats) { + d->tc_stats.bytes = b->bytes; + d->tc_stats.packets = b->packets; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b)); + + return 0; +} + +/** + * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV + * @d: dumping handle + * @r: rate estimator statistics + * + * Appends the rate estimator statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r) +{ + if (d->compat_tc_stats) { + d->tc_stats.bps = r->bps; + d->tc_stats.pps = r->pps; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); + + return 0; +} + +/** + * gnet_stats_copy_queue - copy queue statistics into statistics TLV + * @d: dumping handle + * @q: queue statistics + * + * Appends the queue statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) +{ + if (d->compat_tc_stats) { + d->tc_stats.drops = q->drops; + d->tc_stats.qlen = q->qlen; + d->tc_stats.backlog = q->backlog; + d->tc_stats.overlimits = q->overlimits; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); + + return 0; +} + +/** + * gnet_stats_copy_app - copy application specific statistics into statistics TLV + * @d: dumping handle + * @st: application specific statistics data + * @len: length of data + * + * Appends the application sepecific statistics to the top level TLV created by + * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping + * handle is in backward compatibility mode. + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) +{ + if (d->compat_xstats) { + d->xstats = st; + d->xstats_len = len; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_APP, st, len); + + return 0; +} + +/** + * gnet_stats_finish_copy - finish dumping procedure + * @d: dumping handle + * + * Corrects the length of the top level TLV to include all TLVs added + * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs + * if gnet_stats_start_copy_compat() was used and releases the statistics + * lock. + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_finish_copy(struct gnet_dump *d) +{ + if (d->tail) + d->tail->rta_len = d->skb->tail - (u8 *) d->tail; + + if (d->compat_tc_stats) + if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, + sizeof(d->tc_stats)) < 0) + return -1; + + if (d->compat_xstats && d->xstats) { + if (gnet_stats_copy(d, d->compat_xstats, d->xstats, + d->xstats_len) < 0) + return -1; + } + + spin_unlock_bh(d->lock); + return 0; +} + + +EXPORT_SYMBOL(gnet_stats_start_copy); +EXPORT_SYMBOL(gnet_stats_start_copy_compat); +EXPORT_SYMBOL(gnet_stats_copy_basic); +EXPORT_SYMBOL(gnet_stats_copy_rate_est); +EXPORT_SYMBOL(gnet_stats_copy_queue); +EXPORT_SYMBOL(gnet_stats_copy_app); +EXPORT_SYMBOL(gnet_stats_finish_copy); -- cgit v1.2.3-58-ga151