selftests/xsk: Make batch size variable

Convert the constant BATCH_SIZE into a variable named batch_size to allow
dynamic modification at runtime. This is required for the forthcoming
changes to support testing different hardware ring sizes.

While running these tests, a bug was identified when the batch size is
roughly the same as the NIC ring size. This has now been addressed by
Maciej's fix in commit 913eda2b08cc ("i40e: xsk: remove count_mask").

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/20240402114529.545475-3-tushar.vyavahare@intel.com

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
index f174df2d693f..425304e52f35 100644
--- a/tools/testing/selftests/bpf/xskxceiver.h
+++ b/tools/testing/selftests/bpf/xskxceiver.h
@@ -44,7 +44,7 @@
 #define MAX_ETH_JUMBO_SIZE 9000
 #define USLEEP_MAX 10000
 #define SOCK_RECONF_CTR 10
-#define BATCH_SIZE 64
+#define DEFAULT_BATCH_SIZE 64
 #define POLL_TMOUT 1000
 #define THREAD_TMOUT 3
 #define DEFAULT_PKT_CNT (4 * 1024)
@@ -91,6 +91,7 @@ struct xsk_socket_info {
 	struct pkt_stream *pkt_stream;
 	u32 outstanding_tx;
 	u32 rxqsize;
+	u32 batch_size;
 	u8 dst_mac[ETH_ALEN];
 	u8 src_mac[ETH_ALEN];
 };