pktgen: Add missing !flag parameters

o FLOW_SEQ now can be disabled with pgset "flag !FLOW_SEQ"
o FLOW_SEQ and FLOW_RND are antonyms, as it's shown by pktgen_if_show()
o IPSEC now may be disabled

Note, that IPV6 is enabled with dst6/src6 parameters, not with
a flag parameter.
Signed-off-by: NDmitry Safonov <dima@arista.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/pktgen.c

@@ -1284,9 +1284,12 @@ static ssize_t pktgen_if_write(struct file *file,
 		else if (strcmp(f, "!SVID_RND") == 0)
 			pkt_dev->flags &= ~F_SVID_RND;
 
-		else if (strcmp(f, "FLOW_SEQ") == 0)
+		else if (strcmp(f, "FLOW_SEQ") == 0 || strcmp(f, "!FLOW_RND") == 0)
 			pkt_dev->flags |= F_FLOW_SEQ;
 
+		else if (strcmp(f, "FLOW_RND") == 0 || strcmp(f, "!FLOW_SEQ") == 0)
+			pkt_dev->flags &= ~F_FLOW_SEQ;
+
 		else if (strcmp(f, "QUEUE_MAP_RND") == 0)
 			pkt_dev->flags |= F_QUEUE_MAP_RND;
 
@@ -1301,6 +1304,9 @@ static ssize_t pktgen_if_write(struct file *file,
 #ifdef CONFIG_XFRM
 		else if (strcmp(f, "IPSEC") == 0)
 			pkt_dev->flags |= F_IPSEC_ON;
+
+		else if (strcmp(f, "!IPSEC") == 0)
+			pkt_dev->flags &= ~F_IPSEC_ON;
 #endif
 
 		else if (strcmp(f, "!IPV6") == 0)