From: Felix Fietkau <nbd@nbd.name>
To: netdev@vger.kernel.org, John Crispin <john@phrozen.org>,
Sean Wang <sean.wang@mediatek.com>,
Mark Lee <Mark-MC.Lee@mediatek.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Russell King <linux@armlinux.org.uk>
Cc: Vladimir Oltean <olteanv@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next v3 4/4] net: ethernet: mtk_eth_soc: enable hardware DSA untagging
Date: Thu, 10 Nov 2022 22:22:11 +0100 [thread overview]
Message-ID: <20221110212212.96825-5-nbd@nbd.name> (raw)
In-Reply-To: <20221110212212.96825-1-nbd@nbd.name>
- pass the tag to DSA via metadata dst
- disabled on 7986 for now, since it's not working yet
- disabled if a MAC is enabled that does not use DSA
This improves performance by bypassing the DSA tag driver and avoiding extra
skb data mangling
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 66 ++++++++++++++++++---
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 8 +++
2 files changed, 67 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index a118c715b09b..991ffa0b02f5 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -23,6 +23,7 @@
#include <linux/jhash.h>
#include <linux/bitfield.h>
#include <net/dsa.h>
+#include <net/dst_metadata.h>
#include "mtk_eth_soc.h"
#include "mtk_wed.h"
@@ -1939,13 +1940,19 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
__vlan_hwaccel_put_tag(skb, htons(RX_DMA_VPID(trxd.rxd3)),
RX_DMA_VID(trxd.rxd3));
}
+ }
+
+ /* When using VLAN untagging in combination with DSA, the
+ * hardware treats the MTK special tag as a VLAN and untags it.
+ */
+ if (skb_vlan_tag_present(skb) && netdev_uses_dsa(netdev)) {
+ unsigned int port = ntohs(skb->vlan_proto) & GENMASK(2, 0);
- /* If the device is attached to a dsa switch, the special
- * tag inserted in VLAN field by hw switch can * be offloaded
- * by RX HW VLAN offload. Clear vlan info.
- */
- if (netdev_uses_dsa(netdev))
- __vlan_hwaccel_clear_tag(skb);
+ if (port < ARRAY_SIZE(eth->dsa_meta) &&
+ eth->dsa_meta[port])
+ skb_dst_set_noref(skb, ð->dsa_meta[port]->dst);
+
+ __vlan_hwaccel_clear_tag(skb);
}
skb_record_rx_queue(skb, 0);
@@ -2990,11 +2997,46 @@ static void mtk_gdm_config(struct mtk_eth *eth, u32 config)
mtk_w32(eth, 0, MTK_RST_GL);
}
+
+static bool mtk_uses_dsa(struct net_device *dev)
+{
+#if IS_ENABLED(CONFIG_NET_DSA)
+ return netdev_uses_dsa(dev) &&
+ dev->dsa_ptr->tag_ops->proto == DSA_TAG_PROTO_MTK;
+#else
+ return false;
+#endif
+}
+
static int mtk_open(struct net_device *dev)
{
struct mtk_mac *mac = netdev_priv(dev);
struct mtk_eth *eth = mac->hw;
- int err;
+ int i, err;
+
+ if (mtk_uses_dsa(dev)) {
+ for (i = 0; i < ARRAY_SIZE(eth->dsa_meta); i++) {
+ struct metadata_dst *md_dst = eth->dsa_meta[i];
+
+ if (md_dst)
+ continue;
+
+ md_dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
+ GFP_KERNEL);
+ if (!md_dst)
+ return -ENOMEM;
+
+ md_dst->u.port_info.port_id = i;
+ eth->dsa_meta[i] = md_dst;
+ }
+ } else {
+ /* Hardware special tag parsing needs to be disabled if at least
+ * one MAC does not use DSA.
+ */
+ u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
+ val &= ~MTK_CDMP_STAG_EN;
+ mtk_w32(eth, val, MTK_CDMP_IG_CTRL);
+ }
err = phylink_of_phy_connect(mac->phylink, mac->of_node, 0);
if (err) {
@@ -3321,6 +3363,10 @@ static int mtk_hw_init(struct mtk_eth *eth)
*/
val = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
mtk_w32(eth, val | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
+ if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
+ val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
+ mtk_w32(eth, val | MTK_CDMP_STAG_EN, MTK_CDMP_IG_CTRL);
+ }
/* Enable RX VLan Offloading */
mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
@@ -3538,6 +3584,12 @@ static int mtk_free_dev(struct mtk_eth *eth)
free_netdev(eth->netdev[i]);
}
+ for (i = 0; i < ARRAY_SIZE(eth->dsa_meta); i++) {
+ if (!eth->dsa_meta[i])
+ break;
+ metadata_dst_free(eth->dsa_meta[i]);
+ }
+
return 0;
}
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 589f27ddc401..a572416e25de 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -22,6 +22,9 @@
#include <linux/bpf_trace.h>
#include "mtk_ppe.h"
+#define MTK_MAX_DSA_PORTS 7
+#define MTK_DSA_PORT_MASK GENMASK(2, 0)
+
#define MTK_QDMA_PAGE_SIZE 2048
#define MTK_MAX_RX_LENGTH 1536
#define MTK_MAX_RX_LENGTH_2K 2048
@@ -91,6 +94,9 @@
#define MTK_CDMQ_IG_CTRL 0x1400
#define MTK_CDMQ_STAG_EN BIT(0)
+/* CDMQ Exgress Control Register */
+#define MTK_CDMQ_EG_CTRL 0x1404
+
/* CDMP Ingress Control Register */
#define MTK_CDMP_IG_CTRL 0x400
#define MTK_CDMP_STAG_EN BIT(0)
@@ -1121,6 +1127,8 @@ struct mtk_eth {
int ip_align;
+ struct metadata_dst *dsa_meta[MTK_MAX_DSA_PORTS];
+
struct mtk_ppe *ppe[2];
struct rhashtable flow_table;
--
2.38.1
prev parent reply other threads:[~2022-11-10 21:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20221110212212.96825-1-nbd@nbd.name>
2022-11-10 21:22 ` [PATCH net-next v3 1/4] net: dsa: add support for DSA rx offloading via metadata dst Felix Fietkau
2022-11-11 23:37 ` Vladimir Oltean
2022-11-12 0:05 ` Felix Fietkau
2022-11-12 4:40 ` Jakub Kicinski
2022-11-12 11:13 ` Felix Fietkau
2022-11-14 11:55 ` Vladimir Oltean
2022-11-14 12:06 ` Felix Fietkau
2022-11-14 12:17 ` Vladimir Oltean
2022-11-14 13:18 ` Dave Taht
2022-11-14 13:33 ` Felix Fietkau
2022-11-14 12:15 ` Vladimir Oltean
2022-11-10 21:22 ` [PATCH net-next v3 2/4] net: ethernet: mtk_eth_soc: pass correct VLAN protocol ID to the network stack Felix Fietkau
2022-11-10 21:22 ` [PATCH net-next v3 3/4] net: ethernet: mtk_eth_soc: add support for configuring vlan rx offload Felix Fietkau
2022-11-10 21:22 ` Felix Fietkau [this message]
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