linux-kernel - [RFC net-next 1/1] idpf: Don't hard code napi

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Message-Id: <20240925180017.82891-2-jdamato@fastly.com>
Date: Wed, 25 Sep 2024 18:00:17 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: Joe Damato <jdamato@...tly.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC net-next 1/1] idpf: Don't hard code napi_struct size

The sizeof(struct napi_struct) can change. Don't hardcode the size to
400 bytes and instead use "sizeof(struct napi_struct)".

While fixing this, also move other calculations into compile time
defines.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 drivers/net/ethernet/intel/idpf/idpf_txrx.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
index f0537826f840..d5e904ddcb6e 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
@@ -437,9 +437,13 @@ struct idpf_q_vector {
 	cpumask_var_t affinity_mask;
 	__cacheline_group_end_aligned(cold);
 };
-libeth_cacheline_set_assert(struct idpf_q_vector, 112,
-			    424 + 2 * sizeof(struct dim),
-			    8 + sizeof(cpumask_var_t));
+
+#define IDPF_Q_VECTOR_RO_SZ (112)
+#define IDPF_Q_VECTOR_RW_SZ (sizeof(struct napi_struct) + 24 + \
+			     2 * sizeof(struct dim))
+#define IDPF_Q_VECTOR_COLD_SZ (8 + sizeof(cpumask_var_t))
+libeth_cacheline_set_assert(struct idpf_q_vector, IDPF_Q_VECTOR_RO_SZ,
+			    IDPF_Q_VECTOR_RW_SZ, IDPF_Q_VECTOR_COLD_SZ);
 
 struct idpf_rx_queue_stats {
 	u64_stats_t packets;
-- 
2.25.1