--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Mellanox Technologies. All rights reserved */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/etherdevice.h>
+#include <linux/inet.h>
+#include <linux/kernel.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <net/devlink.h>
+#include <net/ip.h>
+#include <net/psample.h>
+#include <uapi/linux/ip.h>
+#include <uapi/linux/udp.h>
+
+#include "netdevsim.h"
+
+#define NSIM_PSAMPLE_REPORT_INTERVAL_MS 100
+#define NSIM_PSAMPLE_INVALID_TC 0xFFFF
+#define NSIM_PSAMPLE_L4_DATA_LEN 100
+
+struct nsim_dev_psample {
+ struct delayed_work psample_dw;
+ struct dentry *ddir;
+ struct psample_group *group;
+ u32 rate;
+ u32 group_num;
+ u32 trunc_size;
+ int in_ifindex;
+ int out_ifindex;
+ u16 out_tc;
+ u64 out_tc_occ_max;
+ u64 latency_max;
+ bool is_active;
+};
+
+static struct sk_buff *nsim_dev_psample_skb_build(void)
+{
+ int tot_len, data_len = NSIM_PSAMPLE_L4_DATA_LEN;
+ struct sk_buff *skb;
+ struct udphdr *udph;
+ struct ethhdr *eth;
+ struct iphdr *iph;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+ tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;
+
+ skb_reset_mac_header(skb);
+ eth = skb_put(skb, sizeof(struct ethhdr));
+ eth_random_addr(eth->h_dest);
+ eth_random_addr(eth->h_source);
+ eth->h_proto = htons(ETH_P_IP);
+ skb->protocol = htons(ETH_P_IP);
+
+ skb_set_network_header(skb, skb->len);
+ iph = skb_put(skb, sizeof(struct iphdr));
+ iph->protocol = IPPROTO_UDP;
+ iph->saddr = in_aton("192.0.2.1");
+ iph->daddr = in_aton("198.51.100.1");
+ iph->version = 0x4;
+ iph->frag_off = 0;
+ iph->ihl = 0x5;
+ iph->tot_len = htons(tot_len);
+ iph->id = 0;
+ iph->ttl = 100;
+ iph->check = 0;
+ iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
+
+ skb_set_transport_header(skb, skb->len);
+ udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
+ get_random_bytes(&udph->source, sizeof(u16));
+ get_random_bytes(&udph->dest, sizeof(u16));
+ udph->len = htons(sizeof(struct udphdr) + data_len);
+
+ return skb;
+}
+
+static void nsim_dev_psample_md_prepare(const struct nsim_dev_psample *psample,
+ struct psample_metadata *md)
+{
+ md->trunc_size = psample->trunc_size;
+ md->in_ifindex = psample->in_ifindex;
+ md->out_ifindex = psample->out_ifindex;
+
+ if (psample->out_tc != NSIM_PSAMPLE_INVALID_TC) {
+ md->out_tc = psample->out_tc;
+ md->out_tc_valid = 1;
+ }
+
+ if (psample->out_tc_occ_max) {
+ u64 out_tc_occ;
+
+ get_random_bytes(&out_tc_occ, sizeof(u64));
+ md->out_tc_occ = out_tc_occ & (psample->out_tc_occ_max - 1);
+ md->out_tc_occ_valid = 1;
+ }
+
+ if (psample->latency_max) {
+ u64 latency;
+
+ get_random_bytes(&latency, sizeof(u64));
+ md->latency = latency & (psample->latency_max - 1);
+ md->latency_valid = 1;
+ }
+}
+
+static void nsim_dev_psample_report_work(struct work_struct *work)
+{
+ struct nsim_dev_psample *psample;
+ struct psample_metadata md = {};
+ struct sk_buff *skb;
+ unsigned long delay;
+
+ psample = container_of(work, struct nsim_dev_psample, psample_dw.work);
+
+ skb = nsim_dev_psample_skb_build();
+ if (!skb)
+ goto out;
+
+ nsim_dev_psample_md_prepare(psample, &md);
+ psample_sample_packet(psample->group, skb, psample->rate, &md);
+ consume_skb(skb);
+
+out:
+ delay = msecs_to_jiffies(NSIM_PSAMPLE_REPORT_INTERVAL_MS);
+ schedule_delayed_work(&psample->psample_dw, delay);
+}
+
+static int nsim_dev_psample_enable(struct nsim_dev *nsim_dev)
+{
+ struct nsim_dev_psample *psample = nsim_dev->psample;
+ struct devlink *devlink;
+ unsigned long delay;
+
+ if (psample->is_active)
+ return -EBUSY;
+
+ devlink = priv_to_devlink(nsim_dev);
+ psample->group = psample_group_get(devlink_net(devlink),
+ psample->group_num);
+ if (!psample->group)
+ return -EINVAL;
+
+ delay = msecs_to_jiffies(NSIM_PSAMPLE_REPORT_INTERVAL_MS);
+ schedule_delayed_work(&psample->psample_dw, delay);
+
+ psample->is_active = true;
+
+ return 0;
+}
+
+static int nsim_dev_psample_disable(struct nsim_dev *nsim_dev)
+{
+ struct nsim_dev_psample *psample = nsim_dev->psample;
+
+ if (!psample->is_active)
+ return -EINVAL;
+
+ psample->is_active = false;
+
+ cancel_delayed_work_sync(&psample->psample_dw);
+ psample_group_put(psample->group);
+
+ return 0;
+}
+
+static ssize_t nsim_dev_psample_enable_write(struct file *file,
+ const char __user *data,
+ size_t count, loff_t *ppos)
+{
+ struct nsim_dev *nsim_dev = file->private_data;
+ bool enable;
+ int err;
+
+ err = kstrtobool_from_user(data, count, &enable);
+ if (err)
+ return err;
+
+ if (enable)
+ err = nsim_dev_psample_enable(nsim_dev);
+ else
+ err = nsim_dev_psample_disable(nsim_dev);
+
+ return err ? err : count;
+}
+
+static const struct file_operations nsim_psample_enable_fops = {
+ .open = simple_open,
+ .write = nsim_dev_psample_enable_write,
+ .llseek = generic_file_llseek,
+ .owner = THIS_MODULE,
+};
+
+int nsim_dev_psample_init(struct nsim_dev *nsim_dev)
+{
+ struct nsim_dev_psample *psample;
+ int err;
+
+ psample = kzalloc(sizeof(*psample), GFP_KERNEL);
+ if (!psample)
+ return -ENOMEM;
+ nsim_dev->psample = psample;
+
+ INIT_DELAYED_WORK(&psample->psample_dw, nsim_dev_psample_report_work);
+
+ psample->ddir = debugfs_create_dir("psample", nsim_dev->ddir);
+ if (IS_ERR(psample->ddir)) {
+ err = PTR_ERR(psample->ddir);
+ goto err_psample_free;
+ }
+
+ /* Populate sampling parameters with sane defaults. */
+ psample->rate = 100;
+ debugfs_create_u32("rate", 0600, psample->ddir, &psample->rate);
+
+ psample->group_num = 10;
+ debugfs_create_u32("group_num", 0600, psample->ddir,
+ &psample->group_num);
+
+ psample->trunc_size = 0;
+ debugfs_create_u32("trunc_size", 0600, psample->ddir,
+ &psample->trunc_size);
+
+ psample->in_ifindex = 1;
+ debugfs_create_u32("in_ifindex", 0600, psample->ddir,
+ &psample->in_ifindex);
+
+ psample->out_ifindex = 2;
+ debugfs_create_u32("out_ifindex", 0600, psample->ddir,
+ &psample->out_ifindex);
+
+ psample->out_tc = 0;
+ debugfs_create_u16("out_tc", 0600, psample->ddir, &psample->out_tc);
+
+ psample->out_tc_occ_max = 10000;
+ debugfs_create_u64("out_tc_occ_max", 0600, psample->ddir,
+ &psample->out_tc_occ_max);
+
+ psample->latency_max = 50;
+ debugfs_create_u64("latency_max", 0600, psample->ddir,
+ &psample->latency_max);
+
+ debugfs_create_file("enable", 0200, psample->ddir, nsim_dev,
+ &nsim_psample_enable_fops);
+
+ return 0;
+
+err_psample_free:
+ kfree(nsim_dev->psample);
+ return err;
+}
+
+void nsim_dev_psample_exit(struct nsim_dev *nsim_dev)
+{
+ debugfs_remove_recursive(nsim_dev->psample->ddir);
+ if (nsim_dev->psample->is_active) {
+ cancel_delayed_work_sync(&nsim_dev->psample->psample_dw);
+ psample_group_put(nsim_dev->psample->group);
+ }
+ kfree(nsim_dev->psample);
+}
projects / linux-platform-drivers-x86.git / commitdiff