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bmips: backport b53 legacy tags support
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
parent
d6c5698a71
commit
a139ab1b82
@ -0,0 +1,104 @@
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From a3b0b6479700a5b0af2c631cb2ec0fb7a0d978f2 Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Sun, 1 Nov 2020 21:16:09 +0200
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Subject: [PATCH] net: dsa: implement a central TX reallocation procedure
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At the moment, taggers are left with the task of ensuring that the skb
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headers are writable (which they aren't, if the frames were cloned for
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TX timestamping, for flooding by the bridge, etc), and that there is
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enough space in the skb data area for the DSA tag to be pushed.
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Moreover, the life of tail taggers is even harder, because they need to
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ensure that short frames have enough padding, a problem that normal
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taggers don't have.
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The principle of the DSA framework is that everything except for the
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most intimate hardware specifics (like in this case, the actual packing
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of the DSA tag bits) should be done inside the core, to avoid having
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code paths that are very rarely tested.
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So provide a TX reallocation procedure that should cover the known needs
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of DSA today.
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Note that this patch also gives the network stack a good hint about the
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headroom/tailroom it's going to need. Up till now it wasn't doing that.
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So the reallocation procedure should really be there only for the
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exceptional cases, and for cloned packets which need to be unshared.
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Tested-by: Christian Eggers <ceggers@arri.de> # For tail taggers only
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Tested-by: Kurt Kanzenbach <kurt@linutronix.de>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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net/dsa/slave.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 45 insertions(+)
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--- a/net/dsa/slave.c
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+++ b/net/dsa/slave.c
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@@ -548,6 +548,30 @@ netdev_tx_t dsa_enqueue_skb(struct sk_bu
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}
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EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
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+static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
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+{
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+ int needed_headroom = dev->needed_headroom;
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+ int needed_tailroom = dev->needed_tailroom;
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+
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+ /* For tail taggers, we need to pad short frames ourselves, to ensure
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+ * that the tail tag does not fail at its role of being at the end of
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+ * the packet, once the master interface pads the frame. Account for
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+ * that pad length here, and pad later.
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+ */
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+ if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
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+ needed_tailroom += ETH_ZLEN - skb->len;
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+ /* skb_headroom() returns unsigned int... */
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+ needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
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+ needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
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+
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+ if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
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+ /* No reallocation needed, yay! */
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+ return 0;
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+
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+ return pskb_expand_head(skb, needed_headroom, needed_tailroom,
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+ GFP_ATOMIC);
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+}
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+
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static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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@@ -567,6 +591,17 @@ static netdev_tx_t dsa_slave_xmit(struct
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*/
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dsa_skb_tx_timestamp(p, skb);
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+ if (dsa_realloc_skb(skb, dev)) {
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+ dev_kfree_skb_any(skb);
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+ return NETDEV_TX_OK;
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+ }
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+
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+ /* needed_tailroom should still be 'warm' in the cache line from
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+ * dsa_realloc_skb(), which has also ensured that padding is safe.
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+ */
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+ if (dev->needed_tailroom)
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+ eth_skb_pad(skb);
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+
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/* Transmit function may have to reallocate the original SKB,
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* in which case it must have freed it. Only free it here on error.
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*/
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@@ -1825,6 +1860,16 @@ int dsa_slave_create(struct dsa_port *po
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slave_dev->netdev_ops = &dsa_slave_netdev_ops;
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if (ds->ops->port_max_mtu)
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slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
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+ if (cpu_dp->tag_ops->tail_tag)
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+ slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
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+ else
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+ slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
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+ /* Try to save one extra realloc later in the TX path (in the master)
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+ * by also inheriting the master's needed headroom and tailroom.
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+ * The 8021q driver also does this.
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+ */
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+ slave_dev->needed_headroom += master->needed_headroom;
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+ slave_dev->needed_tailroom += master->needed_tailroom;
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SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
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netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
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@ -1,59 +1,22 @@
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From 3bc3d79efdff6e29b80bf35f7a56baaa36e4d8fe Mon Sep 17 00:00:00 2001
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From 964dbf186eaa84d409c359ddf09c827a3fbe8228 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
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Date: Fri, 12 Mar 2021 12:35:39 +0100
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Subject: [PATCH] net: dsa: b53: support tags for legacy switches
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Date: Wed, 17 Mar 2021 11:29:26 +0100
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Subject: [PATCH 1/2] net: dsa: tag_brcm: add support for legacy tags
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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---
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drivers/net/dsa/b53/Kconfig | 1 +
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drivers/net/dsa/b53/b53_common.c | 6 +++
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include/net/dsa.h | 2 +
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net/dsa/Kconfig | 7 +++
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net/dsa/tag_brcm.c | 93 ++++++++++++++++++++++++++++++++
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5 files changed, 109 insertions(+)
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Add support for legacy Broadcom tags, which are similar to DSA_TAG_PROTO_BRCM.
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These tags are used on BCM5325, BCM5365 and BCM63xx switches.
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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include/net/dsa.h | 2 +
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net/dsa/Kconfig | 7 +++
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net/dsa/tag_brcm.c | 107 +++++++++++++++++++++++++++++++++++++++++++--
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3 files changed, 113 insertions(+), 3 deletions(-)
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--- a/drivers/net/dsa/b53/Kconfig
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+++ b/drivers/net/dsa/b53/Kconfig
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@@ -3,6 +3,7 @@ menuconfig B53
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tristate "Broadcom BCM53xx managed switch support"
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depends on NET_DSA
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select NET_DSA_TAG_BRCM
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+ select NET_DSA_TAG_BRCM_LEGACY
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select NET_DSA_TAG_BRCM_PREPEND
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help
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This driver adds support for Broadcom managed switch chips. It supports
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--- a/drivers/net/dsa/b53/b53_common.c
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+++ b/drivers/net/dsa/b53/b53_common.c
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@@ -1992,6 +1992,7 @@ static bool b53_can_enable_brcm_tags(str
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switch (tag_protocol) {
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case DSA_TAG_PROTO_BRCM:
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+ case DSA_TAG_PROTO_BRCM_LEGACY:
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case DSA_TAG_PROTO_BRCM_PREPEND:
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dev_warn(ds->dev,
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"Port %d is stacked to Broadcom tag switch\n", port);
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@@ -2013,12 +2014,16 @@ enum dsa_tag_protocol b53_get_tag_protoc
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/* Older models (5325, 5365) support a different tag format that we do
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* not support in net/dsa/tag_brcm.c yet.
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*/
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- if (is5325(dev) || is5365(dev) ||
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- !b53_can_enable_brcm_tags(ds, port, mprot)) {
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+ if (!b53_can_enable_brcm_tags(ds, port, mprot)) {
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dev->tag_protocol = DSA_TAG_PROTO_NONE;
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goto out;
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}
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+ if (is5325(dev) || is5365(dev) || is63xx(dev)) {
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+ dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY;
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+ goto out;
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+ }
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+
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/* Broadcom BCM58xx chips have a flow accelerator on Port 8
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* which requires us to use the prepended Broadcom tag type
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*/
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--- a/include/net/dsa.h
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+++ b/include/net/dsa.h
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@@ -45,10 +45,12 @@ struct phylink_link_state;
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@ -87,31 +50,37 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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tristate "Tag driver for Broadcom switches using prepended headers"
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--- a/net/dsa/tag_brcm.c
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+++ b/net/dsa/tag_brcm.c
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@@ -8,9 +8,23 @@
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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+#include <linux/types.h>
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@@ -11,9 +11,26 @@
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#include "dsa_priv.h"
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+struct bcm_legacy_tag {
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+ uint16_t type;
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+#define BRCM_LEG_TYPE 0x8874
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-/* This tag length is 4 bytes, older ones were 6 bytes, we do not
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- * handle them
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- */
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+/* Legacy Broadcom tag (6 bytes) */
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+#define BRCM_LEG_TAG_LEN 6
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+
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+ uint32_t tag;
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+#define BRCM_LEG_TAG_PORT_ID (0xf)
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+#define BRCM_LEG_TAG_MULTICAST (1 << 29)
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+#define BRCM_LEG_TAG_EGRESS (2 << 29)
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+#define BRCM_LEG_TAG_INGRESS (3 << 29)
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+} __attribute__((packed));
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+/* Type fields */
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+/* 1st byte in the tag */
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+#define BRCM_LEG_TYPE_HI 0x88
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+/* 2nd byte in the tag */
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+#define BRCM_LEG_TYPE_LO 0x74
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+
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+#define BRCM_LEG_TAG_LEN sizeof(struct bcm_legacy_tag)
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+/* Tag fields */
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+/* 3rd byte in the tag */
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+#define BRCM_LEG_UNICAST (0 << 5)
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+#define BRCM_LEG_MULTICAST (1 << 5)
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+#define BRCM_LEG_EGRESS (2 << 5)
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+#define BRCM_LEG_INGRESS (3 << 5)
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+
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/* This tag length is 4 bytes, older ones were 6 bytes, we do not
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* handle them
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*/
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@@ -197,6 +211,85 @@ DSA_TAG_DRIVER(brcm_netdev_ops);
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+/* 6th byte in the tag */
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+#define BRCM_LEG_PORT_ID (0xf)
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+
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+/* Newer Broadcom tag (4 bytes) */
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#define BRCM_TAG_LEN 4
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/* Tag is constructed and desconstructed using byte by byte access
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@@ -197,6 +214,87 @@ DSA_TAG_DRIVER(brcm_netdev_ops);
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM);
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#endif
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@ -120,10 +89,7 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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+ struct net_device *dev)
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+{
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+ struct dsa_port *dp = dsa_slave_to_port(dev);
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+ struct bcm_legacy_tag *brcm_tag;
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+
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+ if (skb_cow_head(skb, BRCM_LEG_TAG_LEN) < 0)
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+ return NULL;
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+ u8 *brcm_tag;
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+
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+ /* The Ethernet switch we are interfaced with needs packets to be at
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+ * least 64 bytes (including FCS) otherwise they will be discarded when
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@ -141,29 +107,34 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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+
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+ memmove(skb->data, skb->data + BRCM_LEG_TAG_LEN, 2 * ETH_ALEN);
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+
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+ brcm_tag = (struct bcm_legacy_tag *) (skb->data + 2 * ETH_ALEN);
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+ brcm_tag = skb->data + 2 * ETH_ALEN;
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+
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+ brcm_tag->type = BRCM_LEG_TYPE;
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+ brcm_tag->tag = BRCM_LEG_TAG_EGRESS;
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+ brcm_tag->tag |= dp->index & BRCM_LEG_TAG_PORT_ID;
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+ /* Broadcom tag type */
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+ brcm_tag[0] = BRCM_LEG_TYPE_HI;
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+ brcm_tag[1] = BRCM_LEG_TYPE_LO;
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+
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+ /* Broadcom tag value */
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+ brcm_tag[2] = BRCM_LEG_EGRESS;
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+ brcm_tag[3] = 0;
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+ brcm_tag[4] = 0;
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+ brcm_tag[5] = dp->index & BRCM_LEG_PORT_ID;
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+
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+ return skb;
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+}
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+
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+
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+static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb,
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+ struct net_device *dev,
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+ struct packet_type *pt)
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+{
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+ int source_port;
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+ struct bcm_legacy_tag *brcm_tag;
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+ u8 *brcm_tag;
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+
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+ if (unlikely(!pskb_may_pull(skb, BRCM_LEG_TAG_LEN)))
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+ if (unlikely(!pskb_may_pull(skb, BRCM_LEG_PORT_ID)))
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+ return NULL;
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+
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+ brcm_tag = (struct bcm_legacy_tag *) (skb->data - 2);
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+ brcm_tag = skb->data - 2;
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+
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+ source_port = brcm_tag->tag & BRCM_LEG_TAG_PORT_ID;
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+ source_port = brcm_tag[5] & BRCM_LEG_PORT_ID;
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+
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+ skb->dev = dsa_master_find_slave(dev, 0, source_port);
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+ if (!skb->dev)
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@ -183,10 +154,10 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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+}
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+
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+static const struct dsa_device_ops brcm_legacy_netdev_ops = {
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+ .name = "brcm-legacy",
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+ .proto = DSA_TAG_PROTO_BRCM_LEGACY,
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+ .xmit = brcm_leg_tag_xmit,
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+ .rcv = brcm_leg_tag_rcv,
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+ .name = "brcm-legacy",
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+ .proto = DSA_TAG_PROTO_BRCM_LEGACY,
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+ .xmit = brcm_leg_tag_xmit,
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+ .rcv = brcm_leg_tag_rcv,
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+ .overhead = BRCM_LEG_TAG_LEN,
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+};
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+
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@ -197,7 +168,7 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND)
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static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb,
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struct net_device *dev)
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@@ -229,6 +322,9 @@ static struct dsa_tag_driver *dsa_tag_dr
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@@ -229,6 +327,9 @@ static struct dsa_tag_driver *dsa_tag_dr
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#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM)
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&DSA_TAG_DRIVER_NAME(brcm_netdev_ops),
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#endif
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@ -0,0 +1,53 @@
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From 46c5176c586c81306bf9e7024c13b95da775490f Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
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Date: Wed, 17 Mar 2021 11:29:27 +0100
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Subject: [PATCH 2/2] net: dsa: b53: support legacy tags
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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These tags are used on BCM5325, BCM5365 and BCM63xx switches.
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/b53/Kconfig | 1 +
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drivers/net/dsa/b53/b53_common.c | 12 +++++++-----
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2 files changed, 8 insertions(+), 5 deletions(-)
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--- a/drivers/net/dsa/b53/Kconfig
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+++ b/drivers/net/dsa/b53/Kconfig
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@@ -3,6 +3,7 @@ menuconfig B53
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tristate "Broadcom BCM53xx managed switch support"
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depends on NET_DSA
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select NET_DSA_TAG_BRCM
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+ select NET_DSA_TAG_BRCM_LEGACY
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select NET_DSA_TAG_BRCM_PREPEND
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help
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This driver adds support for Broadcom managed switch chips. It supports
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--- a/drivers/net/dsa/b53/b53_common.c
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+++ b/drivers/net/dsa/b53/b53_common.c
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@@ -2010,15 +2010,17 @@ enum dsa_tag_protocol b53_get_tag_protoc
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{
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struct b53_device *dev = ds->priv;
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- /* Older models (5325, 5365) support a different tag format that we do
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- * not support in net/dsa/tag_brcm.c yet.
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- */
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- if (is5325(dev) || is5365(dev) ||
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- !b53_can_enable_brcm_tags(ds, port, mprot)) {
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+ if (!b53_can_enable_brcm_tags(ds, port, mprot)) {
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dev->tag_protocol = DSA_TAG_PROTO_NONE;
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goto out;
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}
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+ /* Older models require a different 6 byte tag */
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+ if (is5325(dev) || is5365(dev) || is63xx(dev)) {
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+ dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY;
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+ goto out;
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+ }
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+
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/* Broadcom BCM58xx chips have a flow accelerator on Port 8
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* which requires us to use the prepended Broadcom tag type
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*/
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Reference in New Issue
Block a user