projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 54a52823 GM |
1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* | |
| 3 | * XRS700x tag format handling | |
| 4 | * Copyright (c) 2008-2009 Marvell Semiconductor | |
| 5 | * Copyright (c) 2020 NovaTech LLC | |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/bitops.h> | |
| 9 | ||
| 10 | #include "dsa_priv.h" | |
| 11 | ||
| 12 | static struct sk_buff *xrs700x_xmit(struct sk_buff *skb, struct net_device *dev) | |
| 13 | { | |
| bd62e6f5 | 14 | struct dsa_port *partner, *dp = dsa_slave_to_port(dev); |
| 54a52823 GM |
15 | u8 *trailer; |
| 16 | ||
| 17 | trailer = skb_put(skb, 1); | |
| 18 | trailer[0] = BIT(dp->index); | |
| 19 | ||
| bd62e6f5 GM |
20 | if (dp->hsr_dev) |
| 21 | dsa_hsr_foreach_port(partner, dp->ds, dp->hsr_dev) | |
| 22 | if (partner != dp) | |
| 23 | trailer[0] |= BIT(partner->index); | |
| 24 | ||
| 54a52823 GM |
25 | return skb; |
| 26 | } | |
| 27 | ||
| 28 | static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, struct net_device *dev, | |
| 29 | struct packet_type *pt) | |
| 30 | { | |
| 31 | int source_port; | |
| 32 | u8 *trailer; | |
| 33 | ||
| 34 | trailer = skb_tail_pointer(skb) - 1; | |
| 35 | ||
| 36 | source_port = ffs((int)trailer[0]) - 1; | |
| 37 | ||
| 38 | if (source_port < 0) | |
| 39 | return NULL; | |
| 40 | ||
| 41 | skb->dev = dsa_master_find_slave(dev, 0, source_port); | |
| 42 | if (!skb->dev) | |
| 43 | return NULL; | |
| 44 | ||
| 45 | if (pskb_trim_rcsum(skb, skb->len - 1)) | |
| 46 | return NULL; | |
| 47 | ||
| 48 | /* Frame is forwarded by hardware, don't forward in software. */ | |
| 49 | skb->offload_fwd_mark = 1; | |
| 50 | ||
| 51 | return skb; | |
| 52 | } | |
| 53 | ||
| 54 | static const struct dsa_device_ops xrs700x_netdev_ops = { | |
| 55 | .name = "xrs700x", | |
| 56 | .proto = DSA_TAG_PROTO_XRS700X, | |
| 57 | .xmit = xrs700x_xmit, | |
| 58 | .rcv = xrs700x_rcv, | |
| 59 | .overhead = 1, | |
| 60 | .tail_tag = true, | |
| 61 | }; | |
| 62 | ||
| 63 | MODULE_LICENSE("GPL"); | |
| 64 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_XRS700X); | |
| 65 | ||
| 66 | module_dsa_tag_driver(xrs700x_netdev_ops); |