macsec: report the offloading mode currently selected

This patch adds support to report the MACsec offloading mode currently
being enabled, which as of now can either be 'off' or 'phy'. This
information is reported through the `ip macsec show` command:

  # ip macsec show
  18: macsec0: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
      cipher suite: GCM-AES-128, using ICV length 16
      TXSC: 3e5035b67c860001 on SA 0
          0: PN 1, state on, key 00000000000000000000000000000000
      RXSC: b4969112700f0001, state on
          0: PN 1, state on, key 01000000000000000000000000000000
      offload: phy
  19: macsec1: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
      cipher suite: GCM-AES-128, using ICV length 16
      TXSC: 3e5035b67c880001 on SA 0
          1: PN 1, state on, key 00000000000000000000000000000000
      RXSC: b4969112700f0001, state on
          1: PN 1, state on, key 01000000000000000000000000000000
      offload: off

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/ip/ipmacsec.c b/ip/ipmacsec.c
index ad6ad7d6b79fae6f9234522ac40dfbc20976b958..4327c796aa1ff4690cf2c70b9fc4b342d92c3d3b 100644 (file)
--- a/ip/ipmacsec.c
+++ b/ip/ipmacsec.c
@@ -31,6 +31,11 @@ static const char * const validate_str[] = {
        [MACSEC_VALIDATE_STRICT] = "strict",
 };
 
+static const char * const offload_str[] = {
+       [MACSEC_OFFLOAD_OFF] = "off",
+       [MACSEC_OFFLOAD_PHY] = "phy",
+};
+
 struct sci {
        __u64 sci;
        __u16 port;
@@ -605,6 +610,14 @@ static const char *cs_id_to_name(__u64 cid)
        }
 }
 
+static const char *offload_to_str(__u8 offload)
+{
+       if (offload >= ARRAY_SIZE(offload_str))
+               return "(unknown)";
+
+       return offload_str[offload];
+}
+
 static void print_attrs(struct rtattr *attrs[])
 {
        print_flag(attrs, "protect", MACSEC_SECY_ATTR_PROTECT);
@@ -997,6 +1010,19 @@ static int process(struct nlmsghdr *n, void *arg)
        if (attrs[MACSEC_ATTR_RXSC_LIST])
                print_rxsc_list(attrs[MACSEC_ATTR_RXSC_LIST]);
 
+       if (attrs[MACSEC_ATTR_OFFLOAD]) {
+               struct rtattr *attrs_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
+               __u8 offload;
+
+               parse_rtattr_nested(attrs_offload, MACSEC_OFFLOAD_ATTR_MAX,
+                                   attrs[MACSEC_ATTR_OFFLOAD]);
+
+               offload = rta_getattr_u8(attrs_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
+               print_string(PRINT_ANY, "offload",
+                            "    offload: %s ", offload_to_str(offload));
+               print_nl();
+       }
+
        close_json_object();
 
        return 0;