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| author |   George McCollister <george.mccollister@gmail.com> | 2021-01-14 13:57:32 -0600 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-01-15 15:36:31 -0800 |
| commit | 54a52823a2d606871c33ef9e2793299768d5d896 (patch) | |
| tree | f4ba23c94139659ebf5c7f9a01dc2b560b19a3e3 /net/dsa | |
| parent | Merge branch 'add-further-dt-configuration-for-at803x-phys' (diff) | |
| download | linux-dev-54a52823a2d606871c33ef9e2793299768d5d896.tar.xz linux-dev-54a52823a2d606871c33ef9e2793299768d5d896.zip | |
dsa: add support for Arrow XRS700x tag trailer
Add support for Arrow SpeedChips XRS700x single byte tag trailer. This
is modeled on tag_trailer.c which works in a similar way.
Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/Kconfig | 6 | ||||
| -rw-r--r-- | net/dsa/Makefile | 1 | ||||
| -rw-r--r-- | net/dsa/tag_xrs700x.c | 61 |
3 files changed, 68 insertions, 0 deletions
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index dfecd7b22fd7..2d226a5c085f 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -139,4 +139,10 @@ config NET_DSA_TAG_TRAILER Say Y or M if you want to enable support for tagging frames at with a trailed. e.g. Marvell 88E6060. +config NET_DSA_TAG_XRS700X + tristate "Tag driver for XRS700x switches" + help + Say Y or M if you want to enable support for tagging frames for + Arrow SpeedChips XRS700x switches that use a single byte tag trailer. + endif diff --git a/net/dsa/Makefile b/net/dsa/Makefile index 0fb2b75a7ae3..92cea2132241 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o +obj-$(CONFIG_NET_DSA_TAG_XRS700X) += tag_xrs700x.o diff --git a/net/dsa/tag_xrs700x.c b/net/dsa/tag_xrs700x.c new file mode 100644 index 000000000000..db0ed1a5fcb7 --- /dev/null +++ b/net/dsa/tag_xrs700x.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * XRS700x tag format handling + * Copyright (c) 2008-2009 Marvell Semiconductor + * Copyright (c) 2020 NovaTech LLC + */ + +#include <linux/bitops.h> + +#include "dsa_priv.h" + +static struct sk_buff *xrs700x_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct dsa_port *dp = dsa_slave_to_port(dev); + u8 *trailer; + + trailer = skb_put(skb, 1); + trailer[0] = BIT(dp->index); + + return skb; +} + +static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt) +{ + int source_port; + u8 *trailer; + + trailer = skb_tail_pointer(skb) - 1; + + source_port = ffs((int)trailer[0]) - 1; + + if (source_port < 0) + return NULL; + + skb->dev = dsa_master_find_slave(dev, 0, source_port); + if (!skb->dev) + return NULL; + + if (pskb_trim_rcsum(skb, skb->len - 1)) + return NULL; + + /* Frame is forwarded by hardware, don't forward in software. */ + skb->offload_fwd_mark = 1; + + return skb; +} + +static const struct dsa_device_ops xrs700x_netdev_ops = { + .name = "xrs700x", + .proto = DSA_TAG_PROTO_XRS700X, + .xmit = xrs700x_xmit, + .rcv = xrs700x_rcv, + .overhead = 1, + .tail_tag = true, +}; + +MODULE_LICENSE("GPL"); +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_XRS700X); + +module_dsa_tag_driver(xrs700x_netdev_ops); |