linux-kernel - [PATCH net-next 7/7] net: ipa: rearrange GSI structure fields

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Message-Id: <20211124202511.862588-8-elder@linaro.org>
Date:   Wed, 24 Nov 2021 14:25:11 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     pkurapat@...eaurora.org, avuyyuru@...eaurora.org,
        bjorn.andersson@...aro.org, cpratapa@...eaurora.org,
        subashab@...eaurora.org, evgreen@...omium.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 7/7] net: ipa: rearrange GSI structure fields

The dummy net_device is a large field in the GSI structure, but it
is not at all interesting from the perspective of debugging.  Move
it to the end of the GSI structure so the other fields are easier to
find in memory.

The channel and event ring arrays are also very large, so move them
near the end of the structure as well.

Swap the position of the result and completion fields to improve
structure packing.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h
index ccaa333e37620..75dfc7655f3ba 100644
--- a/drivers/net/ipa/gsi.h
+++ b/drivers/net/ipa/gsi.h
@@ -145,21 +145,21 @@ struct gsi_evt_ring {
 struct gsi {
 	struct device *dev;		/* Same as IPA device */
 	enum ipa_version version;
-	struct net_device dummy_dev;	/* needed for NAPI */
 	void __iomem *virt_raw;		/* I/O mapped address range */
 	void __iomem *virt;		/* Adjusted for most registers */
 	u32 irq;
 	u32 channel_count;
 	u32 evt_ring_count;
-	struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
-	struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
 	u32 event_bitmap;		/* allocated event rings */
 	u32 modem_channel_bitmap;	/* modem channels to allocate */
 	u32 type_enabled_bitmap;	/* GSI IRQ types enabled */
 	u32 ieob_enabled_bitmap;	/* IEOB IRQ enabled (event rings) */
-	struct completion completion;	/* Signals GSI command completion */
 	int result;			/* Negative errno (generic commands) */
+	struct completion completion;	/* Signals GSI command completion */
 	struct mutex mutex;		/* protects commands, programming */
+	struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
+	struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
+	struct net_device dummy_dev;	/* needed for NAPI */
 };
 
 /**
-- 
2.32.0