xdp-bench: Add drop mode for egress action

Simple XDP_DROP program as egress action.

Signed-off-by: Dragos Tatulea <[email protected]>

Author: dtatulea

xdp-bench/xdp-bench.8

@@ -523,6 +523,7 @@ Set egress program to load:
 .RS
 .nf
 \fCforward	- Update the packet data so its source MAC address matches the one of the destination interface.
+drop		- Drop packet.
 \fP
 .fi
 .RE
@@ -593,6 +594,7 @@ Set egress program to load:
 .RS
 .nf
 \fCforward	- Update the packet data so its source MAC address matches the one of the destination interface.
+drop		- Drop packet.
 \fP
 .fi
 .RE

xdp-bench/xdp-bench.c

@@ -70,6 +70,7 @@ struct enum_val cpumap_program_modes[] = {
 
 struct enum_val devmap_egress_actions[] = {
        {"forward", DEVMAP_EGRESS_FORWARD },
+       {"drop", DEVMAP_EGRESS_DROP },
        {NULL, 0}
 };
 

xdp-bench/xdp-bench.h

@@ -51,6 +51,7 @@ struct redirect_opts {
 enum devmap_egress_action {
 	DEVMAP_EGRESS_NONE,
 	DEVMAP_EGRESS_FORWARD,
+	DEVMAP_EGRESS_DROP,
 };
 
 struct devmap_opts {

xdp-bench/xdp_redirect_devmap.bpf.c

@@ -85,4 +85,10 @@ int xdp_redirect_devmap_egress(struct xdp_md *ctx)
 	return XDP_PASS;
 }
 
+SEC("xdp/devmap")
+int xdp_redirect_devmap_egress_drop(struct xdp_md *ctx)
+{
+	return XDP_DROP;
+}
+
 char _license[] SEC("license") = "GPL";

xdp-bench/xdp_redirect_devmap.c

@@ -37,6 +37,8 @@ static struct bpf_program *egress_prog(struct xdp_redirect_devmap *skel,
 				       enum devmap_egress_action action)
 {
 	switch (action) {
+	case DEVMAP_EGRESS_DROP:
+		return skel->progs.xdp_redirect_devmap_egress_drop;
 	case DEVMAP_EGRESS_NONE:
 	case DEVMAP_EGRESS_FORWARD:
 	default:

xdp-bench/xdp_redirect_devmap_multi.bpf.c

@@ -74,4 +74,10 @@ int xdp_devmap_prog(struct xdp_md *ctx)
 	return XDP_PASS;
 }
 
+SEC("xdp/devmap")
+int xdp_redirect_devmap_egress_drop(struct xdp_md *ctx)
+{
+	return XDP_DROP;
+}
+
 char _license[] SEC("license") = "GPL";

xdp-bench/xdp_redirect_devmap_multi.c

@@ -72,6 +72,8 @@ egress_prog_multi(struct xdp_redirect_devmap_multi *skel,
 		  enum devmap_egress_action action)
 {
 	switch (action) {
+	case DEVMAP_EGRESS_DROP:
+		return skel->progs.xdp_redirect_devmap_egress_drop;
 	case DEVMAP_EGRESS_NONE:
 	case DEVMAP_EGRESS_FORWARD:
 	default: