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Add offloading for HSR/PRP (IEC 62439-3) tag insertion, tag removal forwarding and duplication supported by the xrs7000 series switches. Only HSR v1 and PRP v1 are supported by the xrs7000 series switches (HSR v0 is not). Signed-off-by: George McCollister <george.mccollister@gmail.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* XRS700x tag format handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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* Copyright (c) 2020 NovaTech LLC
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*/
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#include <linux/bitops.h>
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#include "dsa_priv.h"
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static struct sk_buff *xrs700x_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_port *partner, *dp = dsa_slave_to_port(dev);
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u8 *trailer;
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trailer = skb_put(skb, 1);
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trailer[0] = BIT(dp->index);
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if (dp->hsr_dev)
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dsa_hsr_foreach_port(partner, dp->ds, dp->hsr_dev)
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if (partner != dp)
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trailer[0] |= BIT(partner->index);
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return skb;
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}
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static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, 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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u8 *trailer;
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trailer = skb_tail_pointer(skb) - 1;
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source_port = ffs((int)trailer[0]) - 1;
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if (source_port < 0)
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return NULL;
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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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return NULL;
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if (pskb_trim_rcsum(skb, skb->len - 1))
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return NULL;
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/* Frame is forwarded by hardware, don't forward in software. */
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skb->offload_fwd_mark = 1;
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return skb;
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}
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static const struct dsa_device_ops xrs700x_netdev_ops = {
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.name = "xrs700x",
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.proto = DSA_TAG_PROTO_XRS700X,
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.xmit = xrs700x_xmit,
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.rcv = xrs700x_rcv,
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.overhead = 1,
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.tail_tag = true,
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};
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_XRS700X);
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module_dsa_tag_driver(xrs700x_netdev_ops);
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