macvlan: Add bclim parameter

This patch adds support for setting the broadcast queueing threshold
on macvlan devices.  This controls which multicast packets will be
processed in a workqueue instead of inline.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
 ip/iplink_macvlan.c          |   26 ++++++++++++++++++++++++--
 man/man8/ip-link.8.in        |   18 ++++++++++++++++++
 3 files changed, 43 insertions(+), 2 deletions(-)

Signed-off-by: David Ahern <dsahern@kernel.org>

diff --git a/ip/iplink_macvlan.c b/ip/iplink_macvlan.c
index 0f13637d8fbc9537d4b2bd8b5047efde997b9423..6bdc76d1a700ae69ca9327d2bde4882898db91dc 100644 (file)
--- a/ip/iplink_macvlan.c
+++ b/ip/iplink_macvlan.c
@@ -26,13 +26,14 @@
 static void print_explain(struct link_util *lu, FILE *f)
 {
        fprintf(f,
-               "Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS [bcqueuelen BC_QUEUE_LEN]\n"
+               "Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS [bcqueuelen BC_QUEUE_LEN] [bclim BCLIM]\n"
                "\n"
                "MODE: private | vepa | bridge | passthru | source\n"
                "MODE_FLAG: null | nopromisc | nodst\n"
                "MODE_OPTS: for mode \"source\":\n"
                "\tmacaddr { { add | del } <macaddr> | set [ <macaddr> [ <macaddr>  ... ] ] | flush }\n"
-               "BC_QUEUE_LEN: Length of the rx queue for broadcast/multicast: [0-4294967295]\n",
+               "BC_QUEUE_LEN: Length of the rx queue for broadcast/multicast: [0-4294967295]\n"
+               "BCLIM: Threshold for broadcast queueing: 32-bit integer\n",
                lu->id
        );
 }
@@ -67,6 +68,12 @@ static int bc_queue_len_arg(const char *arg)
        return -1;
 }
 
+static int bclim_arg(const char *arg)
+{
+       fprintf(stderr, "Error: illegal value for \"bclim\": \"%s\"\n", arg);
+       return -1;
+}
+
 static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
                          struct nlmsghdr *n)
 {
@@ -168,6 +175,15 @@ static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
                                return bc_queue_len_arg(*argv);
                        }
                        addattr32(n, 1024, IFLA_MACVLAN_BC_QUEUE_LEN, bc_queue_len);
+               } else if (!strcmp(*argv, "bclim")) {
+                       __s32 bclim;
+                       NEXT_ARG();
+
+                       if (get_s32(&bclim, *argv, 0)) {
+                               return bclim_arg(*argv);
+                       }
+                       addattr_l(n, 1024, IFLA_MACVLAN_BC_CUTOFF,
+                                 &bclim, sizeof(bclim));
                } else if (matches(*argv, "help") == 0) {
                        explain(lu);
                        return -1;
@@ -245,6 +261,12 @@ static void macvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]
                print_luint(PRINT_ANY, "usedbcqueuelen", "usedbcqueuelen %lu ", bc_queue_len);
        }
 
+       if (tb[IFLA_MACVLAN_BC_CUTOFF] &&
+               RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_CUTOFF]) >= sizeof(__s32)) {
+               __s32 bclim = rta_getattr_s32(tb[IFLA_MACVLAN_BC_CUTOFF]);
+               print_int(PRINT_ANY, "bclim", "bclim %d ", bclim);
+       }
+
        /* in source mode, there are more options to print */
 
        if (mode != MACVLAN_MODE_SOURCE)

diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index c8c656579364f7015f06b619198ad279541b86d3..bec1b78b033274b54a9d1968c0b5999522baedb3 100644 (file)
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -1479,6 +1479,7 @@ the following additional arguments are supported:
 .BR mode " { " private " | " vepa " | " bridge " | " passthru
 .RB " [ " nopromisc " ] | " source " [ " nodst " ] } "
 .RB " [ " bcqueuelen " { " LENGTH " } ] "
+.RB " [ " bclim " " LIMIT " ] "
 
 .in +8
 .sp
@@ -1537,6 +1538,13 @@ will be the maximum length that any macvlan interface has requested.
 When listing device parameters both the bcqueuelen parameter
 as well as the actual used bcqueuelen are listed to better help
 the user understand the setting.
+
+.BR bclim " " LIMIT
+- Set the threshold for broadcast queueing.
+.BR LIMIT " must be a 32-bit integer."
+Setting this to -1 disables broadcast queueing altogether.  Otherwise
+a multicast address will be queued as broadcast if the number of devices
+using it is greater than the given value.
 .in -8
 
 .TP
@@ -2699,6 +2707,9 @@ Update the broadcast/multicast queue length.
 [
 .BI bcqueuelen "  LENGTH  "
 ]
+[
+.BI bclim " LIMIT "
+]
 
 .in +8
 .BI bcqueuelen " LENGTH "
@@ -2712,6 +2723,13 @@ will be the maximum length that any macvlan interface has requested.
 When listing device parameters both the bcqueuelen parameter
 as well as the actual used bcqueuelen are listed to better help
 the user understand the setting.
+
+.BI bclim " LIMIT "
+- Set the threshold for broadcast queueing.
+.IR LIMIT " must be a 32-bit integer."
+Setting this to -1 disables broadcast queueing altogether.  Otherwise
+a multicast address will be queued as broadcast if the number of devices
+using it is greater than the given value.
 .in -8
 
 .TP