v4.19.13 snapshot.
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
new file mode 100644
index 0000000..46d6cd9
--- /dev/null
+++ b/net/atm/mpoa_proc.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#ifdef CONFIG_PROC_FS
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/ktime.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/atmmpc.h>
+#include <linux/atm.h>
+#include <linux/gfp.h>
+#include "mpc.h"
+#include "mpoa_caches.h"
+
+/*
+ * mpoa_proc.c: Implementation MPOA client's proc
+ * file system statistics
+ */
+
+#if 1
+#define dprintk(format, args...) \
+ printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
+#else
+#define dprintk(format, args...) \
+ do { if (0) \
+ printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
+ } while (0)
+#endif
+
+#if 0
+#define ddprintk(format, args...) \
+ printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
+#else
+#define ddprintk(format, args...) \
+ do { if (0) \
+ printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
+ } while (0)
+#endif
+
+#define STAT_FILE_NAME "mpc" /* Our statistic file's name */
+
+extern struct mpoa_client *mpcs;
+extern struct proc_dir_entry *atm_proc_root; /* from proc.c. */
+
+static int proc_mpc_open(struct inode *inode, struct file *file);
+static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
+ size_t nbytes, loff_t *ppos);
+
+static int parse_qos(const char *buff);
+
+/*
+ * Define allowed FILE OPERATIONS
+ */
+static const struct file_operations mpc_file_operations = {
+ .open = proc_mpc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = proc_mpc_write,
+ .release = seq_release,
+};
+
+/*
+ * Returns the state of an ingress cache entry as a string
+ */
+static const char *ingress_state_string(int state)
+{
+ switch (state) {
+ case INGRESS_RESOLVING:
+ return "resolving ";
+ case INGRESS_RESOLVED:
+ return "resolved ";
+ case INGRESS_INVALID:
+ return "invalid ";
+ case INGRESS_REFRESHING:
+ return "refreshing ";
+ }
+
+ return "";
+}
+
+/*
+ * Returns the state of an egress cache entry as a string
+ */
+static const char *egress_state_string(int state)
+{
+ switch (state) {
+ case EGRESS_RESOLVED:
+ return "resolved ";
+ case EGRESS_PURGE:
+ return "purge ";
+ case EGRESS_INVALID:
+ return "invalid ";
+ }
+
+ return "";
+}
+
+/*
+ * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
+ */
+
+static void *mpc_start(struct seq_file *m, loff_t *pos)
+{
+ loff_t l = *pos;
+ struct mpoa_client *mpc;
+
+ if (!l--)
+ return SEQ_START_TOKEN;
+ for (mpc = mpcs; mpc; mpc = mpc->next)
+ if (!l--)
+ return mpc;
+ return NULL;
+}
+
+static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct mpoa_client *p = v;
+ (*pos)++;
+ return v == SEQ_START_TOKEN ? mpcs : p->next;
+}
+
+static void mpc_stop(struct seq_file *m, void *v)
+{
+}
+
+/*
+ * READING function - called when the /proc/atm/mpoa file is read from.
+ */
+static int mpc_show(struct seq_file *m, void *v)
+{
+ struct mpoa_client *mpc = v;
+ int i;
+ in_cache_entry *in_entry;
+ eg_cache_entry *eg_entry;
+ time64_t now;
+ unsigned char ip_string[16];
+
+ if (v == SEQ_START_TOKEN) {
+ atm_mpoa_disp_qos(m);
+ return 0;
+ }
+
+ seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
+ seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
+ now = ktime_get_seconds();
+
+ for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
+ unsigned long seconds_delta = now - in_entry->time;
+
+ sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
+ seq_printf(m, "%-16s%s%-14lu%-12u",
+ ip_string,
+ ingress_state_string(in_entry->entry_state),
+ in_entry->ctrl_info.holding_time -
+ seconds_delta,
+ in_entry->packets_fwded);
+ if (in_entry->shortcut)
+ seq_printf(m, " %-3d %-3d",
+ in_entry->shortcut->vpi,
+ in_entry->shortcut->vci);
+ seq_printf(m, "\n");
+ }
+
+ seq_printf(m, "\n");
+ seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
+ for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
+ unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
+ unsigned long seconds_delta = now - eg_entry->time;
+
+ for (i = 0; i < ATM_ESA_LEN; i++)
+ seq_printf(m, "%02x", p[i]);
+ seq_printf(m, "\n%-16lu%s%-14lu%-15u",
+ (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
+ egress_state_string(eg_entry->entry_state),
+ (eg_entry->ctrl_info.holding_time - seconds_delta),
+ eg_entry->packets_rcvd);
+
+ /* latest IP address */
+ sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
+ seq_printf(m, "%-16s", ip_string);
+
+ if (eg_entry->shortcut)
+ seq_printf(m, " %-3d %-3d",
+ eg_entry->shortcut->vpi,
+ eg_entry->shortcut->vci);
+ seq_printf(m, "\n");
+ }
+ seq_printf(m, "\n");
+ return 0;
+}
+
+static const struct seq_operations mpc_op = {
+ .start = mpc_start,
+ .next = mpc_next,
+ .stop = mpc_stop,
+ .show = mpc_show
+};
+
+static int proc_mpc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &mpc_op);
+}
+
+static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
+ size_t nbytes, loff_t *ppos)
+{
+ char *page, *p;
+ unsigned int len;
+
+ if (nbytes == 0)
+ return 0;
+
+ if (nbytes >= PAGE_SIZE)
+ nbytes = PAGE_SIZE-1;
+
+ page = (char *)__get_free_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ for (p = page, len = 0; len < nbytes; p++, len++) {
+ if (get_user(*p, buff++)) {
+ free_page((unsigned long)page);
+ return -EFAULT;
+ }
+ if (*p == '\0' || *p == '\n')
+ break;
+ }
+
+ *p = '\0';
+
+ if (!parse_qos(page))
+ printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
+
+ free_page((unsigned long)page);
+
+ return len;
+}
+
+static int parse_qos(const char *buff)
+{
+ /* possible lines look like this
+ * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
+ */
+ unsigned char ip[4];
+ int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
+ __be32 ipaddr;
+ struct atm_qos qos;
+
+ memset(&qos, 0, sizeof(struct atm_qos));
+
+ if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
+ ip, ip+1, ip+2, ip+3) == 4) {
+ ipaddr = *(__be32 *)ip;
+ return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
+ }
+
+ if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
+ ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
+ rx_pcr = tx_pcr;
+ rx_sdu = tx_sdu;
+ } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
+ ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
+ return 0;
+
+ ipaddr = *(__be32 *)ip;
+ qos.txtp.traffic_class = ATM_CBR;
+ qos.txtp.max_pcr = tx_pcr;
+ qos.txtp.max_sdu = tx_sdu;
+ qos.rxtp.traffic_class = ATM_CBR;
+ qos.rxtp.max_pcr = rx_pcr;
+ qos.rxtp.max_sdu = rx_sdu;
+ qos.aal = ATM_AAL5;
+ dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
+ qos.txtp.max_pcr, qos.txtp.max_sdu,
+ qos.rxtp.max_pcr, qos.rxtp.max_sdu);
+
+ atm_mpoa_add_qos(ipaddr, &qos);
+ return 1;
+}
+
+/*
+ * INITIALIZATION function - called when module is initialized/loaded.
+ */
+int mpc_proc_init(void)
+{
+ struct proc_dir_entry *p;
+
+ p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
+ if (!p) {
+ pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+/*
+ * DELETING function - called when module is removed.
+ */
+void mpc_proc_clean(void)
+{
+ remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
+}
+
+#endif /* CONFIG_PROC_FS */