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https://github.com/edk2-porting/linux-next.git
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b24413180f
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
570 lines
14 KiB
C
570 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <linux/atmmpc.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include "mpoa_caches.h"
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#include "mpc.h"
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/*
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* mpoa_caches.c: Implementation of ingress and egress cache
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* handling functions
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*/
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#if 0
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#define dprintk(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define dprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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#if 0
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#define ddprintk(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define ddprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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static in_cache_entry *in_cache_get(__be32 dst_ip,
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struct mpoa_client *client)
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{
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in_cache_entry *entry;
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read_lock_bh(&client->ingress_lock);
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entry = client->in_cache;
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while (entry != NULL) {
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if (entry->ctrl_info.in_dst_ip == dst_ip) {
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refcount_inc(&entry->use);
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read_unlock_bh(&client->ingress_lock);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_bh(&client->ingress_lock);
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return NULL;
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}
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static in_cache_entry *in_cache_get_with_mask(__be32 dst_ip,
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struct mpoa_client *client,
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__be32 mask)
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{
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in_cache_entry *entry;
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read_lock_bh(&client->ingress_lock);
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entry = client->in_cache;
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while (entry != NULL) {
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if ((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask)) {
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refcount_inc(&entry->use);
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read_unlock_bh(&client->ingress_lock);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_bh(&client->ingress_lock);
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return NULL;
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}
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static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
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struct mpoa_client *client)
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{
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in_cache_entry *entry;
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read_lock_bh(&client->ingress_lock);
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entry = client->in_cache;
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while (entry != NULL) {
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if (entry->shortcut == vcc) {
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refcount_inc(&entry->use);
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read_unlock_bh(&client->ingress_lock);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_bh(&client->ingress_lock);
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return NULL;
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}
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static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
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struct mpoa_client *client)
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{
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in_cache_entry *entry = kzalloc(sizeof(in_cache_entry), GFP_KERNEL);
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if (entry == NULL) {
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pr_info("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
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return NULL;
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}
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dprintk("adding an ingress entry, ip = %pI4\n", &dst_ip);
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refcount_set(&entry->use, 1);
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dprintk("new_in_cache_entry: about to lock\n");
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write_lock_bh(&client->ingress_lock);
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entry->next = client->in_cache;
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entry->prev = NULL;
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if (client->in_cache != NULL)
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client->in_cache->prev = entry;
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client->in_cache = entry;
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memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
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entry->ctrl_info.in_dst_ip = dst_ip;
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do_gettimeofday(&(entry->tv));
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entry->retry_time = client->parameters.mpc_p4;
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entry->count = 1;
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entry->entry_state = INGRESS_INVALID;
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entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
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refcount_inc(&entry->use);
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write_unlock_bh(&client->ingress_lock);
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dprintk("new_in_cache_entry: unlocked\n");
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return entry;
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}
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static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
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{
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struct atm_mpoa_qos *qos;
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struct k_message msg;
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entry->count++;
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if (entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
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return OPEN;
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if (entry->entry_state == INGRESS_REFRESHING) {
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if (entry->count > mpc->parameters.mpc_p1) {
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msg.type = SND_MPOA_RES_RQST;
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msg.content.in_info = entry->ctrl_info;
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memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
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qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
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if (qos != NULL)
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msg.qos = qos->qos;
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msg_to_mpoad(&msg, mpc);
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do_gettimeofday(&(entry->reply_wait));
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entry->entry_state = INGRESS_RESOLVING;
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}
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if (entry->shortcut != NULL)
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return OPEN;
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return CLOSED;
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}
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if (entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
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return OPEN;
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if (entry->count > mpc->parameters.mpc_p1 &&
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entry->entry_state == INGRESS_INVALID) {
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dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
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mpc->dev->name, &entry->ctrl_info.in_dst_ip);
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entry->entry_state = INGRESS_RESOLVING;
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msg.type = SND_MPOA_RES_RQST;
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memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
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msg.content.in_info = entry->ctrl_info;
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qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
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if (qos != NULL)
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msg.qos = qos->qos;
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msg_to_mpoad(&msg, mpc);
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do_gettimeofday(&(entry->reply_wait));
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}
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return CLOSED;
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}
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static void in_cache_put(in_cache_entry *entry)
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{
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if (refcount_dec_and_test(&entry->use)) {
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memset(entry, 0, sizeof(in_cache_entry));
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kfree(entry);
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}
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}
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/*
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* This should be called with write lock on
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*/
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static void in_cache_remove_entry(in_cache_entry *entry,
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struct mpoa_client *client)
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{
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struct atm_vcc *vcc;
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struct k_message msg;
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vcc = entry->shortcut;
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dprintk("removing an ingress entry, ip = %pI4\n",
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&entry->ctrl_info.in_dst_ip);
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if (entry->prev != NULL)
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entry->prev->next = entry->next;
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else
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client->in_cache = entry->next;
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if (entry->next != NULL)
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entry->next->prev = entry->prev;
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client->in_ops->put(entry);
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if (client->in_cache == NULL && client->eg_cache == NULL) {
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msg.type = STOP_KEEP_ALIVE_SM;
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msg_to_mpoad(&msg, client);
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}
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/* Check if the egress side still uses this VCC */
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if (vcc != NULL) {
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eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc,
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client);
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if (eg_entry != NULL) {
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client->eg_ops->put(eg_entry);
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return;
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}
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vcc_release_async(vcc, -EPIPE);
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}
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}
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/* Call this every MPC-p2 seconds... Not exactly correct solution,
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but an easy one... */
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static void clear_count_and_expired(struct mpoa_client *client)
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{
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in_cache_entry *entry, *next_entry;
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struct timeval now;
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do_gettimeofday(&now);
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write_lock_bh(&client->ingress_lock);
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entry = client->in_cache;
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while (entry != NULL) {
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entry->count = 0;
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next_entry = entry->next;
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if ((now.tv_sec - entry->tv.tv_sec)
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> entry->ctrl_info.holding_time) {
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dprintk("holding time expired, ip = %pI4\n",
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&entry->ctrl_info.in_dst_ip);
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client->in_ops->remove_entry(entry, client);
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}
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entry = next_entry;
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}
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write_unlock_bh(&client->ingress_lock);
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}
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/* Call this every MPC-p4 seconds. */
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static void check_resolving_entries(struct mpoa_client *client)
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{
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struct atm_mpoa_qos *qos;
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in_cache_entry *entry;
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struct timeval now;
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struct k_message msg;
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do_gettimeofday(&now);
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read_lock_bh(&client->ingress_lock);
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entry = client->in_cache;
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while (entry != NULL) {
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if (entry->entry_state == INGRESS_RESOLVING) {
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if ((now.tv_sec - entry->hold_down.tv_sec) <
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client->parameters.mpc_p6) {
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entry = entry->next; /* Entry in hold down */
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continue;
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}
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if ((now.tv_sec - entry->reply_wait.tv_sec) >
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entry->retry_time) {
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entry->retry_time = MPC_C1 * (entry->retry_time);
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/*
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* Retry time maximum exceeded,
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* put entry in hold down.
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*/
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if (entry->retry_time > client->parameters.mpc_p5) {
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do_gettimeofday(&(entry->hold_down));
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entry->retry_time = client->parameters.mpc_p4;
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entry = entry->next;
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continue;
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}
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/* Ask daemon to send a resolution request. */
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memset(&(entry->hold_down), 0, sizeof(struct timeval));
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msg.type = SND_MPOA_RES_RTRY;
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memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
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msg.content.in_info = entry->ctrl_info;
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qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
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if (qos != NULL)
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msg.qos = qos->qos;
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msg_to_mpoad(&msg, client);
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do_gettimeofday(&(entry->reply_wait));
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}
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}
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entry = entry->next;
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}
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read_unlock_bh(&client->ingress_lock);
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}
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/* Call this every MPC-p5 seconds. */
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static void refresh_entries(struct mpoa_client *client)
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{
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struct timeval now;
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struct in_cache_entry *entry = client->in_cache;
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ddprintk("refresh_entries\n");
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do_gettimeofday(&now);
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read_lock_bh(&client->ingress_lock);
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while (entry != NULL) {
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if (entry->entry_state == INGRESS_RESOLVED) {
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if (!(entry->refresh_time))
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entry->refresh_time = (2 * (entry->ctrl_info.holding_time))/3;
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if ((now.tv_sec - entry->reply_wait.tv_sec) >
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entry->refresh_time) {
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dprintk("refreshing an entry.\n");
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entry->entry_state = INGRESS_REFRESHING;
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}
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}
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entry = entry->next;
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}
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read_unlock_bh(&client->ingress_lock);
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}
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static void in_destroy_cache(struct mpoa_client *mpc)
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{
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write_lock_irq(&mpc->ingress_lock);
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while (mpc->in_cache != NULL)
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mpc->in_ops->remove_entry(mpc->in_cache, mpc);
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write_unlock_irq(&mpc->ingress_lock);
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}
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static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
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struct mpoa_client *mpc)
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{
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eg_cache_entry *entry;
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read_lock_irq(&mpc->egress_lock);
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entry = mpc->eg_cache;
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while (entry != NULL) {
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if (entry->ctrl_info.cache_id == cache_id) {
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refcount_inc(&entry->use);
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read_unlock_irq(&mpc->egress_lock);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_irq(&mpc->egress_lock);
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return NULL;
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}
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/* This can be called from any context since it saves CPU flags */
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static eg_cache_entry *eg_cache_get_by_tag(__be32 tag, struct mpoa_client *mpc)
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{
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unsigned long flags;
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eg_cache_entry *entry;
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read_lock_irqsave(&mpc->egress_lock, flags);
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entry = mpc->eg_cache;
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while (entry != NULL) {
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if (entry->ctrl_info.tag == tag) {
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refcount_inc(&entry->use);
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read_unlock_irqrestore(&mpc->egress_lock, flags);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_irqrestore(&mpc->egress_lock, flags);
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return NULL;
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}
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/* This can be called from any context since it saves CPU flags */
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static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc,
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struct mpoa_client *mpc)
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{
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unsigned long flags;
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eg_cache_entry *entry;
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read_lock_irqsave(&mpc->egress_lock, flags);
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entry = mpc->eg_cache;
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while (entry != NULL) {
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if (entry->shortcut == vcc) {
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refcount_inc(&entry->use);
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read_unlock_irqrestore(&mpc->egress_lock, flags);
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return entry;
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}
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entry = entry->next;
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}
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read_unlock_irqrestore(&mpc->egress_lock, flags);
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return NULL;
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}
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static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
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struct mpoa_client *mpc)
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{
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eg_cache_entry *entry;
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read_lock_irq(&mpc->egress_lock);
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entry = mpc->eg_cache;
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while (entry != NULL) {
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if (entry->latest_ip_addr == ipaddr) {
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refcount_inc(&entry->use);
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read_unlock_irq(&mpc->egress_lock);
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return entry;
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}
|
|
entry = entry->next;
|
|
}
|
|
read_unlock_irq(&mpc->egress_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void eg_cache_put(eg_cache_entry *entry)
|
|
{
|
|
if (refcount_dec_and_test(&entry->use)) {
|
|
memset(entry, 0, sizeof(eg_cache_entry));
|
|
kfree(entry);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This should be called with write lock on
|
|
*/
|
|
static void eg_cache_remove_entry(eg_cache_entry *entry,
|
|
struct mpoa_client *client)
|
|
{
|
|
struct atm_vcc *vcc;
|
|
struct k_message msg;
|
|
|
|
vcc = entry->shortcut;
|
|
dprintk("removing an egress entry.\n");
|
|
if (entry->prev != NULL)
|
|
entry->prev->next = entry->next;
|
|
else
|
|
client->eg_cache = entry->next;
|
|
if (entry->next != NULL)
|
|
entry->next->prev = entry->prev;
|
|
client->eg_ops->put(entry);
|
|
if (client->in_cache == NULL && client->eg_cache == NULL) {
|
|
msg.type = STOP_KEEP_ALIVE_SM;
|
|
msg_to_mpoad(&msg, client);
|
|
}
|
|
|
|
/* Check if the ingress side still uses this VCC */
|
|
if (vcc != NULL) {
|
|
in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
|
|
if (in_entry != NULL) {
|
|
client->in_ops->put(in_entry);
|
|
return;
|
|
}
|
|
vcc_release_async(vcc, -EPIPE);
|
|
}
|
|
}
|
|
|
|
static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
|
|
struct mpoa_client *client)
|
|
{
|
|
eg_cache_entry *entry = kzalloc(sizeof(eg_cache_entry), GFP_KERNEL);
|
|
|
|
if (entry == NULL) {
|
|
pr_info("out of memory\n");
|
|
return NULL;
|
|
}
|
|
|
|
dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
|
|
&msg->content.eg_info.eg_dst_ip);
|
|
|
|
refcount_set(&entry->use, 1);
|
|
dprintk("new_eg_cache_entry: about to lock\n");
|
|
write_lock_irq(&client->egress_lock);
|
|
entry->next = client->eg_cache;
|
|
entry->prev = NULL;
|
|
if (client->eg_cache != NULL)
|
|
client->eg_cache->prev = entry;
|
|
client->eg_cache = entry;
|
|
|
|
memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
|
|
entry->ctrl_info = msg->content.eg_info;
|
|
do_gettimeofday(&(entry->tv));
|
|
entry->entry_state = EGRESS_RESOLVED;
|
|
dprintk("new_eg_cache_entry cache_id %u\n",
|
|
ntohl(entry->ctrl_info.cache_id));
|
|
dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
|
|
refcount_inc(&entry->use);
|
|
|
|
write_unlock_irq(&client->egress_lock);
|
|
dprintk("new_eg_cache_entry: unlocked\n");
|
|
|
|
return entry;
|
|
}
|
|
|
|
static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
|
|
{
|
|
do_gettimeofday(&(entry->tv));
|
|
entry->entry_state = EGRESS_RESOLVED;
|
|
entry->ctrl_info.holding_time = holding_time;
|
|
}
|
|
|
|
static void clear_expired(struct mpoa_client *client)
|
|
{
|
|
eg_cache_entry *entry, *next_entry;
|
|
struct timeval now;
|
|
struct k_message msg;
|
|
|
|
do_gettimeofday(&now);
|
|
|
|
write_lock_irq(&client->egress_lock);
|
|
entry = client->eg_cache;
|
|
while (entry != NULL) {
|
|
next_entry = entry->next;
|
|
if ((now.tv_sec - entry->tv.tv_sec)
|
|
> entry->ctrl_info.holding_time) {
|
|
msg.type = SND_EGRESS_PURGE;
|
|
msg.content.eg_info = entry->ctrl_info;
|
|
dprintk("egress_cache: holding time expired, cache_id = %u.\n",
|
|
ntohl(entry->ctrl_info.cache_id));
|
|
msg_to_mpoad(&msg, client);
|
|
client->eg_ops->remove_entry(entry, client);
|
|
}
|
|
entry = next_entry;
|
|
}
|
|
write_unlock_irq(&client->egress_lock);
|
|
}
|
|
|
|
static void eg_destroy_cache(struct mpoa_client *mpc)
|
|
{
|
|
write_lock_irq(&mpc->egress_lock);
|
|
while (mpc->eg_cache != NULL)
|
|
mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
|
|
write_unlock_irq(&mpc->egress_lock);
|
|
}
|
|
|
|
|
|
static const struct in_cache_ops ingress_ops = {
|
|
.add_entry = in_cache_add_entry,
|
|
.get = in_cache_get,
|
|
.get_with_mask = in_cache_get_with_mask,
|
|
.get_by_vcc = in_cache_get_by_vcc,
|
|
.put = in_cache_put,
|
|
.remove_entry = in_cache_remove_entry,
|
|
.cache_hit = cache_hit,
|
|
.clear_count = clear_count_and_expired,
|
|
.check_resolving = check_resolving_entries,
|
|
.refresh = refresh_entries,
|
|
.destroy_cache = in_destroy_cache
|
|
};
|
|
|
|
static const struct eg_cache_ops egress_ops = {
|
|
.add_entry = eg_cache_add_entry,
|
|
.get_by_cache_id = eg_cache_get_by_cache_id,
|
|
.get_by_tag = eg_cache_get_by_tag,
|
|
.get_by_vcc = eg_cache_get_by_vcc,
|
|
.get_by_src_ip = eg_cache_get_by_src_ip,
|
|
.put = eg_cache_put,
|
|
.remove_entry = eg_cache_remove_entry,
|
|
.update = update_eg_cache_entry,
|
|
.clear_expired = clear_expired,
|
|
.destroy_cache = eg_destroy_cache
|
|
};
|
|
|
|
void atm_mpoa_init_cache(struct mpoa_client *mpc)
|
|
{
|
|
mpc->in_ops = &ingress_ops;
|
|
mpc->eg_ops = &egress_ops;
|
|
}
|