[PATCH v2 net-next 07/11] sock_diag: add SK_MEMINFO_DROPS

[Eric Dumazet]

Reporting sk_drops to user space was available for UDP
sockets using /proc interface.

Add this to sock_diag, so that we can have the same information
available to ss users, and we'll be able to add sk_drops
indications for TCP sockets as well.

Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 include/uapi/linux/sock_diag.h | 1 +
 net/core/sock_diag.c           | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/uapi/linux/sock_diag.h b/include/uapi/linux/sock_diag.h
index bae2d80034d4..7ff505d8a47b 100644
--- a/include/uapi/linux/sock_diag.h
+++ b/include/uapi/linux/sock_diag.h
@@ -20,6 +20,7 @@ enum {
        SK_MEMINFO_WMEM_QUEUED,
        SK_MEMINFO_OPTMEM,
        SK_MEMINFO_BACKLOG,
+       SK_MEMINFO_DROPS,
 
        SK_MEMINFO_VARS,
 };
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index a996ce8c8fb2..ca9e35bbe13c 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -67,6 +67,7 @@ int sock_diag_put_meminfo(struct sock *sk, struct sk_buff 
*skb, int attrtype)
        mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
        mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
        mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
+       mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
 
        return nla_put(skb, attrtype, sizeof(mem), &mem);
 }
-- 
2.8.0.rc3.226.g39d4020