netdev - [PATCH v4] net: dsa: seville: the packet buffer is 2 megabits, not megabytes

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Message-Id: <20201019050625.21533-1-fido_max@inbox.ru>
Date:   Mon, 19 Oct 2020 08:06:25 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     netdev@...r.kernel.org
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "David S . Miller" <davem@...emloft.net>,
        Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH v4] net: dsa: seville: the packet buffer is 2 megabits, not megabytes

The VSC9953 Seville switch has 2 megabits of buffer split into 4360
words of 60 bytes each. 2048 * 1024 is 2 megabytes instead of 2 megabits.
2 megabits is (2048 / 8) * 1024 = 256 * 1024.

Signed-off-by: Maxim Kochetkov <fido_max@...ox.ru>
Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
Fixes: a63ed92d217f ("net: dsa: seville: fix buffer size of the queue system")
---
 drivers/net/dsa/ocelot/seville_vsc9953.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
index 76576cf0ba8a..1d420c4a2f0f 100644
--- a/drivers/net/dsa/ocelot/seville_vsc9953.c
+++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
@@ -1181,7 +1181,7 @@ static const struct felix_info seville_info_vsc9953 = {
 	.stats_layout		= vsc9953_stats_layout,
 	.num_stats		= ARRAY_SIZE(vsc9953_stats_layout),
 	.vcap			= vsc9953_vcap_props,
-	.shared_queue_sz	= 2048 * 1024,
+	.shared_queue_sz	= 256 * 1024,
 	.num_mact_rows		= 2048,
 	.num_ports		= 10,
 	.mdio_bus_alloc		= vsc9953_mdio_bus_alloc,
-- 
2.27.0