selftests/xsk: Move src_mac and dst_mac to the xsk_socket_info

Move the src_mac and dst_mac fields from the ifobject structure to the
xsk_socket_info structure to achieve per-socket MAC address assignment.

Require this in order to steer traffic to various sockets in subsequent
patches.

Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20230927135241.2287547-4-tushar.vyavahare@intel.com

Author: tvyavaha

tools/testing/selftests/bpf/xskxceiver.c

@@ -104,9 +104,6 @@
 #include "../kselftest.h"
 #include "xsk_xdp_common.h"
 
-static const char *MAC1 = "\x00\x0A\x56\x9E\xEE\x62";
-static const char *MAC2 = "\x00\x0A\x56\x9E\xEE\x61";
-
 static bool opt_verbose;
 static bool opt_print_tests;
 static enum test_mode opt_mode = TEST_MODE_ALL;
@@ -159,10 +156,10 @@ static void write_payload(void *dest, u32 pkt_nb, u32 start, u32 size)
 		ptr[i] = htonl(pkt_nb << 16 | (i + start));
 }
 
-static void gen_eth_hdr(struct ifobject *ifobject, struct ethhdr *eth_hdr)
+static void gen_eth_hdr(struct xsk_socket_info *xsk, struct ethhdr *eth_hdr)
 {
-	memcpy(eth_hdr->h_dest, ifobject->dst_mac, ETH_ALEN);
-	memcpy(eth_hdr->h_source, ifobject->src_mac, ETH_ALEN);
+	memcpy(eth_hdr->h_dest, xsk->dst_mac, ETH_ALEN);
+	memcpy(eth_hdr->h_source, xsk->src_mac, ETH_ALEN);
 	eth_hdr->h_proto = htons(ETH_P_LOOPBACK);
 }
 
@@ -445,6 +442,11 @@ static void __test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
 				ifobj->xsk_arr[j].pkt_stream = test->tx_pkt_stream_default;
 			else
 				ifobj->xsk_arr[j].pkt_stream = test->rx_pkt_stream_default;
+
+			memcpy(ifobj->xsk_arr[j].src_mac, g_mac, ETH_ALEN);
+			memcpy(ifobj->xsk_arr[j].dst_mac, g_mac, ETH_ALEN);
+			ifobj->xsk_arr[j].src_mac[5] += ((j * 2) + 0);
+			ifobj->xsk_arr[j].dst_mac[5] += ((j * 2) + 1);
 		}
 	}
 
@@ -726,16 +728,16 @@ static void pkt_stream_cancel(struct pkt_stream *pkt_stream)
 	pkt_stream->current_pkt_nb--;
 }
 
-static void pkt_generate(struct ifobject *ifobject, u64 addr, u32 len, u32 pkt_nb,
-			 u32 bytes_written)
+static void pkt_generate(struct xsk_socket_info *xsk, struct xsk_umem_info *umem, u64 addr, u32 len,
+			 u32 pkt_nb, u32 bytes_written)
 {
-	void *data = xsk_umem__get_data(ifobject->umem->buffer, addr);
+	void *data = xsk_umem__get_data(umem->buffer, addr);
 
 	if (len < MIN_PKT_SIZE)
 		return;
 
 	if (!bytes_written) {
-		gen_eth_hdr(ifobject, data);
+		gen_eth_hdr(xsk, data);
 
 		len -= PKT_HDR_SIZE;
 		data += PKT_HDR_SIZE;
@@ -1209,7 +1211,7 @@ static int __send_pkts(struct ifobject *ifobject, struct pollfd *fds, bool timeo
 				tx_desc->options = 0;
 			}
 			if (pkt->valid)
-				pkt_generate(ifobject, tx_desc->addr, tx_desc->len, pkt->pkt_nb,
+				pkt_generate(xsk, umem, tx_desc->addr, tx_desc->len, pkt->pkt_nb,
 					     bytes_written);
 			bytes_written += tx_desc->len;
 
@@ -2120,15 +2122,11 @@ static bool hugepages_present(void)
 	return true;
 }
 
-static void init_iface(struct ifobject *ifobj, const char *dst_mac, const char *src_mac,
-		       thread_func_t func_ptr)
+static void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 {
 	LIBBPF_OPTS(bpf_xdp_query_opts, query_opts);
 	int err;
 
-	memcpy(ifobj->dst_mac, dst_mac, ETH_ALEN);
-	memcpy(ifobj->src_mac, src_mac, ETH_ALEN);
-
 	ifobj->func_ptr = func_ptr;
 
 	err = xsk_load_xdp_programs(ifobj);
@@ -2404,8 +2402,8 @@ int main(int argc, char **argv)
 			modes++;
 	}
 
-	init_iface(ifobj_rx, MAC1, MAC2, worker_testapp_validate_rx);
-	init_iface(ifobj_tx, MAC2, MAC1, worker_testapp_validate_tx);
+	init_iface(ifobj_rx, worker_testapp_validate_rx);
+	init_iface(ifobj_tx, worker_testapp_validate_tx);
 
 	test_spec_init(&test, ifobj_tx, ifobj_rx, 0, &tests[0]);
 	tx_pkt_stream_default = pkt_stream_generate(ifobj_tx->umem, DEFAULT_PKT_CNT, MIN_PKT_SIZE);

tools/testing/selftests/bpf/xskxceiver.h

@@ -59,6 +59,7 @@
 #define HUGEPAGE_SIZE (2 * 1024 * 1024)
 #define PKT_DUMP_NB_TO_PRINT 16
 #define RUN_ALL_TESTS UINT_MAX
+#define NUM_MAC_ADDRESSES 4
 
 #define print_verbose(x...) do { if (opt_verbose) ksft_print_msg(x); } while (0)
 
@@ -90,6 +91,8 @@ struct xsk_socket_info {
 	struct pkt_stream *pkt_stream;
 	u32 outstanding_tx;
 	u32 rxqsize;
+	u8 dst_mac[ETH_ALEN];
+	u8 src_mac[ETH_ALEN];
 };
 
 struct pkt {
@@ -140,8 +143,6 @@ struct ifobject {
 	bool unaligned_supp;
 	bool multi_buff_supp;
 	bool multi_buff_zc_supp;
-	u8 dst_mac[ETH_ALEN];
-	u8 src_mac[ETH_ALEN];
 };
 
 struct test_spec {
@@ -168,4 +169,6 @@ pthread_mutex_t pacing_mutex = PTHREAD_MUTEX_INITIALIZER;
 
 int pkts_in_flight;
 
+static const u8 g_mac[ETH_ALEN] = {0x55, 0x44, 0x33, 0x22, 0x11, 0x00};
+
 #endif				/* XSKXCEIVER_H_ */