svn commit: r271751 - head/sys/net

[Gleb Smirnoff]

Author: glebius
Date: Thu Sep 18 09:54:57 2014
New Revision: 271751
URL: http://svnweb.freebsd.org/changeset/base/271751

Log:
  Add if_inc_counter(), a generic method to update ifnet(9) counter
  w/o dereferencing the struct.
  
  Sponsored by:	Netflix
  Sponsored by:	Nginx, Inc.

Modified:
  head/sys/net/if.c
  head/sys/net/if_var.h

Modified: head/sys/net/if.c
==============================================================================
--- head/sys/net/if.c	Thu Sep 18 09:49:49 2014	(r271750)
+++ head/sys/net/if.c	Thu Sep 18 09:54:57 2014	(r271751)
@@ -1422,6 +1422,56 @@ if_get_counter_compat(struct ifnet *ifp,
 }
 
 /*
+ * Increase an ifnet counter. Usually used for counters shared
+ * between the stack and a driver, but function supports them all.
+ */
+void
+if_inc_counter(struct ifnet *ifp, ifnet_counter cnt, int64_t inc)
+{
+
+	switch (cnt) {
+		case IFCOUNTER_IPACKETS:
+			ifp->if_ipackets += inc;
+			break;
+		case IFCOUNTER_IERRORS:
+			ifp->if_ierrors += inc;
+			break;
+		case IFCOUNTER_OPACKETS:
+			ifp->if_opackets += inc;
+			break;
+		case IFCOUNTER_OERRORS:
+			ifp->if_oerrors += inc;
+			break;
+		case IFCOUNTER_COLLISIONS:
+			ifp->if_collisions += inc;
+			break;
+		case IFCOUNTER_IBYTES:
+			ifp->if_ibytes += inc;
+			break;
+		case IFCOUNTER_OBYTES:
+			ifp->if_obytes += inc;
+			break;
+		case IFCOUNTER_IMCASTS:
+			ifp->if_imcasts += inc;
+			break;
+		case IFCOUNTER_OMCASTS:
+			ifp->if_omcasts += inc;
+			break;
+		case IFCOUNTER_IQDROPS:
+			ifp->if_iqdrops += inc;
+			break;
+		case IFCOUNTER_OQDROPS:
+			ifp->if_oqdrops += inc;
+			break;
+		case IFCOUNTER_NOPROTO:
+			ifp->if_noproto += inc;
+			break;
+		default:
+			panic("%s: unknown counter %d", __func__, cnt);
+	}
+}
+
+/*
  * Copy data from ifnet to userland API structure if_data.
  */
 void

Modified: head/sys/net/if_var.h
==============================================================================
--- head/sys/net/if_var.h	Thu Sep 18 09:49:49 2014	(r271750)
+++ head/sys/net/if_var.h	Thu Sep 18 09:54:57 2014	(r271751)
@@ -528,6 +528,7 @@ void	if_register_com_alloc(u_char type, 
 void	if_deregister_com_alloc(u_char type);
 void	if_data_copy(struct ifnet *, struct if_data *);
 uint64_t if_get_counter_compat(struct ifnet *, ifnet_counter);
+void	if_inc_counter(struct ifnet *, ifnet_counter, int64_t);
 
 #define IF_LLADDR(ifp)							\
     LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))