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bmips: backport b53 legacy tags support

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These patches have been accepted upstream for linux 5.13.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Álvaro Fernández Rojas 2021-03-19 10:53:51 +01:00
parent d6c5698a71
commit a139ab1b82
3 changed files with 215 additions and 87 deletions
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104
target/linux/bmips/patches-5.10/010-v5.11-net-dsa-implement-a-central-TX-reallocation-procedur.patch Normal file
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@ -0,0 +1,104 @@
From a3b0b6479700a5b0af2c631cb2ec0fb7a0d978f2 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Sun, 1 Nov 2020 21:16:09 +0200
Subject: [PATCH] net: dsa: implement a central TX reallocation procedure
At the moment, taggers are left with the task of ensuring that the skb
headers are writable (which they aren't, if the frames were cloned for
TX timestamping, for flooding by the bridge, etc), and that there is
enough space in the skb data area for the DSA tag to be pushed.
Moreover, the life of tail taggers is even harder, because they need to
ensure that short frames have enough padding, a problem that normal
taggers don't have.
The principle of the DSA framework is that everything except for the
most intimate hardware specifics (like in this case, the actual packing
of the DSA tag bits) should be done inside the core, to avoid having
code paths that are very rarely tested.
So provide a TX reallocation procedure that should cover the known needs
of DSA today.
Note that this patch also gives the network stack a good hint about the
headroom/tailroom it's going to need. Up till now it wasn't doing that.
So the reallocation procedure should really be there only for the
exceptional cases, and for cloned packets which need to be unshared.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Christian Eggers <ceggers@arri.de> # For tail taggers only
Tested-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
net/dsa/slave.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -548,6 +548,30 @@ netdev_tx_t dsa_enqueue_skb(struct sk_bu
}
EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
+static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
+{
+ int needed_headroom = dev->needed_headroom;
+ int needed_tailroom = dev->needed_tailroom;
+
+ /* For tail taggers, we need to pad short frames ourselves, to ensure
+ * that the tail tag does not fail at its role of being at the end of
+ * the packet, once the master interface pads the frame. Account for
+ * that pad length here, and pad later.
+ */
+ if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
+ needed_tailroom += ETH_ZLEN - skb->len;
+ /* skb_headroom() returns unsigned int... */
+ needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
+ needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
+
+ if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
+ /* No reallocation needed, yay! */
+ return 0;
+
+ return pskb_expand_head(skb, needed_headroom, needed_tailroom,
+ GFP_ATOMIC);
+}
+
static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
@@ -567,6 +591,17 @@ static netdev_tx_t dsa_slave_xmit(struct
*/
dsa_skb_tx_timestamp(p, skb);
+ if (dsa_realloc_skb(skb, dev)) {
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* needed_tailroom should still be 'warm' in the cache line from
+ * dsa_realloc_skb(), which has also ensured that padding is safe.
+ */
+ if (dev->needed_tailroom)
+ eth_skb_pad(skb);
+
/* Transmit function may have to reallocate the original SKB,
* in which case it must have freed it. Only free it here on error.
*/
@@ -1825,6 +1860,16 @@ int dsa_slave_create(struct dsa_port *po
slave_dev->netdev_ops = &dsa_slave_netdev_ops;
if (ds->ops->port_max_mtu)
slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
+ if (cpu_dp->tag_ops->tail_tag)
+ slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
+ else
+ slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
+ /* Try to save one extra realloc later in the TX path (in the master)
+ * by also inheriting the master's needed headroom and tailroom.
+ * The 8021q driver also does this.
+ */
+ slave_dev->needed_headroom += master->needed_headroom;
+ slave_dev->needed_tailroom += master->needed_tailroom;
SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,

145
target/linux/bmips/patches-5.10/502-net-dsa-b53-support-tags-for-legacy-switches.patch → target/linux/bmips/patches-5.10/049-v5.13-net-dsa-tag_brcm-add-support-for-legacy-tags.patch
View File

@ -1,59 +1,22 @@
From 3bc3d79efdff6e29b80bf35f7a56baaa36e4d8fe Mon Sep 17 00:00:00 2001
From 964dbf186eaa84d409c359ddf09c827a3fbe8228 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Fri, 12 Mar 2021 12:35:39 +0100
Subject: [PATCH] net: dsa: b53: support tags for legacy switches
Date: Wed, 17 Mar 2021 11:29:26 +0100
Subject: [PATCH 1/2] net: dsa: tag_brcm: add support for legacy tags
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
drivers/net/dsa/b53/Kconfig | 1 +
drivers/net/dsa/b53/b53_common.c | 6 +++
include/net/dsa.h | 2 +
net/dsa/Kconfig | 7 +++
net/dsa/tag_brcm.c | 93 ++++++++++++++++++++++++++++++++
5 files changed, 109 insertions(+)
Add support for legacy Broadcom tags, which are similar to DSA_TAG_PROTO_BRCM.
These tags are used on BCM5325, BCM5365 and BCM63xx switches.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/dsa.h | 2 +
net/dsa/Kconfig | 7 +++
net/dsa/tag_brcm.c | 107 +++++++++++++++++++++++++++++++++++++++++++--
3 files changed, 113 insertions(+), 3 deletions(-)
--- a/drivers/net/dsa/b53/Kconfig
+++ b/drivers/net/dsa/b53/Kconfig
@@ -3,6 +3,7 @@ menuconfig B53
tristate "Broadcom BCM53xx managed switch support"
depends on NET_DSA
select NET_DSA_TAG_BRCM
+ select NET_DSA_TAG_BRCM_LEGACY
select NET_DSA_TAG_BRCM_PREPEND
help
This driver adds support for Broadcom managed switch chips. It supports
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1992,6 +1992,7 @@ static bool b53_can_enable_brcm_tags(str
switch (tag_protocol) {
case DSA_TAG_PROTO_BRCM:
+ case DSA_TAG_PROTO_BRCM_LEGACY:
case DSA_TAG_PROTO_BRCM_PREPEND:
dev_warn(ds->dev,
"Port %d is stacked to Broadcom tag switch\n", port);
@@ -2013,12 +2014,16 @@ enum dsa_tag_protocol b53_get_tag_protoc
/* Older models (5325, 5365) support a different tag format that we do
* not support in net/dsa/tag_brcm.c yet.
*/
- if (is5325(dev) || is5365(dev) ||
- !b53_can_enable_brcm_tags(ds, port, mprot)) {
+ if (!b53_can_enable_brcm_tags(ds, port, mprot)) {
dev->tag_protocol = DSA_TAG_PROTO_NONE;
goto out;
}
+ if (is5325(dev) || is5365(dev) || is63xx(dev)) {
+ dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY;
+ goto out;
+ }
+
/* Broadcom BCM58xx chips have a flow accelerator on Port 8
* which requires us to use the prepended Broadcom tag type
*/
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -45,10 +45,12 @@ struct phylink_link_state;
@ -87,31 +50,37 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
tristate "Tag driver for Broadcom switches using prepended headers"
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -8,9 +8,23 @@
#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/slab.h>
+#include <linux/types.h>
@@ -11,9 +11,26 @@
#include "dsa_priv.h"
+struct bcm_legacy_tag {
+ uint16_t type;
+#define BRCM_LEG_TYPE 0x8874
-/* This tag length is 4 bytes, older ones were 6 bytes, we do not
- * handle them
- */
+/* Legacy Broadcom tag (6 bytes) */
+#define BRCM_LEG_TAG_LEN 6
+
+ uint32_t tag;
+#define BRCM_LEG_TAG_PORT_ID (0xf)
+#define BRCM_LEG_TAG_MULTICAST (1 << 29)
+#define BRCM_LEG_TAG_EGRESS (2 << 29)
+#define BRCM_LEG_TAG_INGRESS (3 << 29)
+} __attribute__((packed));
+/* Type fields */
+/* 1st byte in the tag */
+#define BRCM_LEG_TYPE_HI 0x88
+/* 2nd byte in the tag */
+#define BRCM_LEG_TYPE_LO 0x74
+
+#define BRCM_LEG_TAG_LEN sizeof(struct bcm_legacy_tag)
+/* Tag fields */
+/* 3rd byte in the tag */
+#define BRCM_LEG_UNICAST (0 << 5)
+#define BRCM_LEG_MULTICAST (1 << 5)
+#define BRCM_LEG_EGRESS (2 << 5)
+#define BRCM_LEG_INGRESS (3 << 5)
+
/* This tag length is 4 bytes, older ones were 6 bytes, we do not
* handle them
*/
@@ -197,6 +211,85 @@ DSA_TAG_DRIVER(brcm_netdev_ops);
+/* 6th byte in the tag */
+#define BRCM_LEG_PORT_ID (0xf)
+
+/* Newer Broadcom tag (4 bytes) */
#define BRCM_TAG_LEN 4
/* Tag is constructed and desconstructed using byte by byte access
@@ -197,6 +214,87 @@ DSA_TAG_DRIVER(brcm_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM);
#endif
@ -120,10 +89,7 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+ struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ struct bcm_legacy_tag *brcm_tag;
+
+ if (skb_cow_head(skb, BRCM_LEG_TAG_LEN) < 0)
+ return NULL;
+ u8 *brcm_tag;
+
+ /* The Ethernet switch we are interfaced with needs packets to be at
+ * least 64 bytes (including FCS) otherwise they will be discarded when
@ -141,29 +107,34 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+
+ memmove(skb->data, skb->data + BRCM_LEG_TAG_LEN, 2 * ETH_ALEN);
+
+ brcm_tag = (struct bcm_legacy_tag *) (skb->data + 2 * ETH_ALEN);
+ brcm_tag = skb->data + 2 * ETH_ALEN;
+
+ brcm_tag->type = BRCM_LEG_TYPE;
+ brcm_tag->tag = BRCM_LEG_TAG_EGRESS;
+ brcm_tag->tag |= dp->index & BRCM_LEG_TAG_PORT_ID;
+ /* Broadcom tag type */
+ brcm_tag[0] = BRCM_LEG_TYPE_HI;
+ brcm_tag[1] = BRCM_LEG_TYPE_LO;
+
+ /* Broadcom tag value */
+ brcm_tag[2] = BRCM_LEG_EGRESS;
+ brcm_tag[3] = 0;
+ brcm_tag[4] = 0;
+ brcm_tag[5] = dp->index & BRCM_LEG_PORT_ID;
+
+ return skb;
+}
+
+
+static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb,
+ struct net_device *dev,
+ struct packet_type *pt)
+{
+ int source_port;
+ struct bcm_legacy_tag *brcm_tag;
+ u8 *brcm_tag;
+
+ if (unlikely(!pskb_may_pull(skb, BRCM_LEG_TAG_LEN)))
+ if (unlikely(!pskb_may_pull(skb, BRCM_LEG_PORT_ID)))
+ return NULL;
+
+ brcm_tag = (struct bcm_legacy_tag *) (skb->data - 2);
+ brcm_tag = skb->data - 2;
+
+ source_port = brcm_tag->tag & BRCM_LEG_TAG_PORT_ID;
+ source_port = brcm_tag[5] & BRCM_LEG_PORT_ID;
+
+ skb->dev = dsa_master_find_slave(dev, 0, source_port);
+ if (!skb->dev)
@ -183,10 +154,10 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+}
+
+static const struct dsa_device_ops brcm_legacy_netdev_ops = {
+ .name = "brcm-legacy",
+ .proto = DSA_TAG_PROTO_BRCM_LEGACY,
+ .xmit = brcm_leg_tag_xmit,
+ .rcv = brcm_leg_tag_rcv,
+ .name = "brcm-legacy",
+ .proto = DSA_TAG_PROTO_BRCM_LEGACY,
+ .xmit = brcm_leg_tag_xmit,
+ .rcv = brcm_leg_tag_rcv,
+ .overhead = BRCM_LEG_TAG_LEN,
+};
+
@ -197,7 +168,7 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND)
static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb,
struct net_device *dev)
@@ -229,6 +322,9 @@ static struct dsa_tag_driver *dsa_tag_dr
@@ -229,6 +327,9 @@ static struct dsa_tag_driver *dsa_tag_dr
#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM)
&DSA_TAG_DRIVER_NAME(brcm_netdev_ops),
#endif

53
target/linux/bmips/patches-5.10/050-v5.13-net-dsa-b53-support-legacy-tags.patch Normal file
View File

@ -0,0 +1,53 @@
From 46c5176c586c81306bf9e7024c13b95da775490f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Wed, 17 Mar 2021 11:29:27 +0100
Subject: [PATCH 2/2] net: dsa: b53: support legacy tags
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
These tags are used on BCM5325, BCM5365 and BCM63xx switches.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/dsa/b53/Kconfig | 1 +
drivers/net/dsa/b53/b53_common.c | 12 +++++++-----
2 files changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/net/dsa/b53/Kconfig
+++ b/drivers/net/dsa/b53/Kconfig
@@ -3,6 +3,7 @@ menuconfig B53
tristate "Broadcom BCM53xx managed switch support"
depends on NET_DSA
select NET_DSA_TAG_BRCM
+ select NET_DSA_TAG_BRCM_LEGACY
select NET_DSA_TAG_BRCM_PREPEND
help
This driver adds support for Broadcom managed switch chips. It supports
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -2010,15 +2010,17 @@ enum dsa_tag_protocol b53_get_tag_protoc
{
struct b53_device *dev = ds->priv;
- /* Older models (5325, 5365) support a different tag format that we do
- * not support in net/dsa/tag_brcm.c yet.
- */
- if (is5325(dev) || is5365(dev) ||
- !b53_can_enable_brcm_tags(ds, port, mprot)) {
+ if (!b53_can_enable_brcm_tags(ds, port, mprot)) {
dev->tag_protocol = DSA_TAG_PROTO_NONE;
goto out;
}
+ /* Older models require a different 6 byte tag */
+ if (is5325(dev) || is5365(dev) || is63xx(dev)) {
+ dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY;
+ goto out;
+ }
+
/* Broadcom BCM58xx chips have a flow accelerator on Port 8
* which requires us to use the prepended Broadcom tag type
*/