diff mbox series

[net-next,3/3] bpf: test_run: Fix cacheline alignment of live XDP frame data structures

Message ID 20240215132634.474055-4-toke@redhat.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Change BPF_TEST_RUN use the system page pool for live XDP frames | expand

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Commit Message

Toke Høiland-Jørgensen Feb. 15, 2024, 1:26 p.m. UTC 
The live XDP frame code in BPF_PROG_RUN suffered from suboptimal cache
line placement due to the forced cache line alignment of struct
xdp_rxq_info. Rearrange things so we don't waste a whole cache line on
padding, and also add explicit alignment to the data_hard_start field in
the start-of-page data structure we use for the data pages.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 net/bpf/test_run.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Daniel Borkmann Feb. 20, 2024, 9:06 a.m. UTC | #1 
On 2/15/24 2:26 PM, Toke Høiland-Jørgensen wrote:
> The live XDP frame code in BPF_PROG_RUN suffered from suboptimal cache
> line placement due to the forced cache line alignment of struct
> xdp_rxq_info. Rearrange things so we don't waste a whole cache line on
> padding, and also add explicit alignment to the data_hard_start field in
> the start-of-page data structure we use for the data pages.
> 
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Acked-by: Daniel Borkmann <daniel@iogearbox.net>
diff mbox series

Patch

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index c742869a0612..d153a3b3528f 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -108,12 +108,12 @@  struct xdp_page_head {
 		/* ::data_hard_start starts here */
 		DECLARE_FLEX_ARRAY(struct xdp_frame, frame);
 		DECLARE_FLEX_ARRAY(u8, data);
-	};
+	} ____cacheline_aligned;
 };
 
 struct xdp_test_data {
-	struct xdp_buff *orig_ctx;
 	struct xdp_rxq_info rxq;
+	struct xdp_buff *orig_ctx;
 	struct net_device *dev;
 	struct xdp_frame **frames;
 	struct sk_buff **skbs;