net-rps: fixes for rps flow limit

Caught by sparse:
- __rcu: missing annotation to sd->flow_limit
- __user: direct access in cpumask_scnprintf

Also
- add endline character when printing bitmap if room in buffer
- avoid bucket overflow by reducing FLOW_LIMIT_HISTORY

The last item warrants some explanation. The hashtable buckets are
subject to overflow if FLOW_LIMIT_HISTORY is larger than or equal
to bucket size, since all packets may end up in a single bucket. The
current (rather arbitrary) history value of 256 happens to match the
buffer size (u8).

As a result, with a single flow, the first 128 packets are accepted
(correct), the second 128 packets dropped (correct) and then the
history[] array has filled, so that each subsequent new packet
causes an increment in the bucket for new_flow plus a decrement
for old_flow: a steady state.

This is fine if packets are dropped, as the steady state goes away
as soon as a mix of traffic reappears. But, because the 256th packet
overflowed the bucket to 0: no packets are dropped.

Instead of explicitly adding an overflow check, this patch changes
FLOW_LIMIT_HISTORY to never be able to overflow a single bucket.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
(first item)

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e5d6557..8c9fcc4 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1840,7 +1840,7 @@ static inline int unregister_gifconf(unsigned int family)
 }
 
 #ifdef CONFIG_NET_FLOW_LIMIT
-#define FLOW_LIMIT_HISTORY     (1 << 8)        /* must be ^2 */
+#define FLOW_LIMIT_HISTORY     (1 << 7)  /* must be ^2 and !overflow buckets */
 struct sd_flow_limit {
        u64                     count;
        unsigned int            num_buckets;
@@ -1883,7 +1883,7 @@ struct softnet_data {
        struct napi_struct      backlog;
 
 #ifdef CONFIG_NET_FLOW_LIMIT
-       struct sd_flow_limit    *flow_limit;
+       struct sd_flow_limit __rcu *flow_limit;
 #endif
 };
 

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 637a42e..78c746e 100644 (file)
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -132,6 +132,8 @@ static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 write_unlock:
                mutex_unlock(&flow_limit_update_mutex);
        } else {
+               char kbuf[128];
+
                if (*ppos || !*lenp) {
                        *lenp = 0;
                        goto done;
@@ -146,9 +148,20 @@ write_unlock:
                }
                rcu_read_unlock();
 
-               len = cpumask_scnprintf(buffer, *lenp, mask);
-               *lenp = len + 1;
-               *ppos += len + 1;
+               len = min(sizeof(kbuf) - 1, *lenp);
+               len = cpumask_scnprintf(kbuf, len, mask);
+               if (!len) {
+                       *lenp = 0;
+                       goto done;
+               }
+               if (len < *lenp)
+                       kbuf[len++] = '\n';
+               if (copy_to_user(buffer, kbuf, len)) {
+                       ret = -EFAULT;
+                       goto done;
+               }
+               *lenp = len;
+               *ppos += len;
        }
 
 done: