tag_ksz.c 5.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
  4. * Copyright (c) 2017 Microchip Technology
  5. */
  6. #include <linux/etherdevice.h>
  7. #include <linux/list.h>
  8. #include <linux/slab.h>
  9. #include <net/dsa.h>
  10. #include "dsa_priv.h"
  11. /* Typically only one byte is used for tail tag. */
  12. #define KSZ_EGRESS_TAG_LEN 1
  13. #define KSZ_INGRESS_TAG_LEN 1
  14. static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
  15. struct net_device *dev,
  16. unsigned int port, unsigned int len)
  17. {
  18. skb->dev = dsa_master_find_slave(dev, 0, port);
  19. if (!skb->dev)
  20. return NULL;
  21. pskb_trim_rcsum(skb, skb->len - len);
  22. skb->offload_fwd_mark = true;
  23. return skb;
  24. }
  25. /*
  26. * For Ingress (Host -> KSZ8795), 1 byte is added before FCS.
  27. * ---------------------------------------------------------------------------
  28. * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag(1byte)|FCS(4bytes)
  29. * ---------------------------------------------------------------------------
  30. * tag : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
  31. *
  32. * For Egress (KSZ8795 -> Host), 1 byte is added before FCS.
  33. * ---------------------------------------------------------------------------
  34. * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
  35. * ---------------------------------------------------------------------------
  36. * tag0 : zero-based value represents port
  37. * (eg, 0x00=port1, 0x02=port3, 0x06=port7)
  38. */
  39. #define KSZ8795_TAIL_TAG_OVERRIDE BIT(6)
  40. #define KSZ8795_TAIL_TAG_LOOKUP BIT(7)
  41. static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev)
  42. {
  43. struct dsa_port *dp = dsa_slave_to_port(dev);
  44. u8 *tag;
  45. u8 *addr;
  46. /* Tag encoding */
  47. tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
  48. addr = skb_mac_header(skb);
  49. *tag = 1 << dp->index;
  50. if (is_link_local_ether_addr(addr))
  51. *tag |= KSZ8795_TAIL_TAG_OVERRIDE;
  52. return skb;
  53. }
  54. static struct sk_buff *ksz8795_rcv(struct sk_buff *skb, struct net_device *dev,
  55. struct packet_type *pt)
  56. {
  57. u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
  58. return ksz_common_rcv(skb, dev, tag[0] & 7, KSZ_EGRESS_TAG_LEN);
  59. }
  60. static const struct dsa_device_ops ksz8795_netdev_ops = {
  61. .name = "ksz8795",
  62. .proto = DSA_TAG_PROTO_KSZ8795,
  63. .xmit = ksz8795_xmit,
  64. .rcv = ksz8795_rcv,
  65. .overhead = KSZ_INGRESS_TAG_LEN,
  66. .tail_tag = true,
  67. };
  68. DSA_TAG_DRIVER(ksz8795_netdev_ops);
  69. MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ8795);
  70. /*
  71. * For Ingress (Host -> KSZ9477), 2 bytes are added before FCS.
  72. * ---------------------------------------------------------------------------
  73. * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
  74. * ---------------------------------------------------------------------------
  75. * tag0 : Prioritization (not used now)
  76. * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
  77. *
  78. * For Egress (KSZ9477 -> Host), 1 byte is added before FCS.
  79. * ---------------------------------------------------------------------------
  80. * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
  81. * ---------------------------------------------------------------------------
  82. * tag0 : zero-based value represents port
  83. * (eg, 0x00=port1, 0x02=port3, 0x06=port7)
  84. */
  85. #define KSZ9477_INGRESS_TAG_LEN 2
  86. #define KSZ9477_PTP_TAG_LEN 4
  87. #define KSZ9477_PTP_TAG_INDICATION 0x80
  88. #define KSZ9477_TAIL_TAG_OVERRIDE BIT(9)
  89. #define KSZ9477_TAIL_TAG_LOOKUP BIT(10)
  90. static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
  91. struct net_device *dev)
  92. {
  93. struct dsa_port *dp = dsa_slave_to_port(dev);
  94. __be16 *tag;
  95. u8 *addr;
  96. u16 val;
  97. /* Tag encoding */
  98. tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
  99. addr = skb_mac_header(skb);
  100. val = BIT(dp->index);
  101. if (is_link_local_ether_addr(addr))
  102. val |= KSZ9477_TAIL_TAG_OVERRIDE;
  103. *tag = cpu_to_be16(val);
  104. return skb;
  105. }
  106. static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
  107. struct packet_type *pt)
  108. {
  109. /* Tag decoding */
  110. u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
  111. unsigned int port = tag[0] & 7;
  112. unsigned int len = KSZ_EGRESS_TAG_LEN;
  113. /* Extra 4-bytes PTP timestamp */
  114. if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
  115. len += KSZ9477_PTP_TAG_LEN;
  116. return ksz_common_rcv(skb, dev, port, len);
  117. }
  118. static const struct dsa_device_ops ksz9477_netdev_ops = {
  119. .name = "ksz9477",
  120. .proto = DSA_TAG_PROTO_KSZ9477,
  121. .xmit = ksz9477_xmit,
  122. .rcv = ksz9477_rcv,
  123. .overhead = KSZ9477_INGRESS_TAG_LEN,
  124. .tail_tag = true,
  125. };
  126. DSA_TAG_DRIVER(ksz9477_netdev_ops);
  127. MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
  128. #define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
  129. #define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
  130. static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
  131. struct net_device *dev)
  132. {
  133. struct dsa_port *dp = dsa_slave_to_port(dev);
  134. u8 *addr;
  135. u8 *tag;
  136. /* Tag encoding */
  137. tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
  138. addr = skb_mac_header(skb);
  139. *tag = BIT(dp->index);
  140. if (is_link_local_ether_addr(addr))
  141. *tag |= KSZ9893_TAIL_TAG_OVERRIDE;
  142. return skb;
  143. }
  144. static const struct dsa_device_ops ksz9893_netdev_ops = {
  145. .name = "ksz9893",
  146. .proto = DSA_TAG_PROTO_KSZ9893,
  147. .xmit = ksz9893_xmit,
  148. .rcv = ksz9477_rcv,
  149. .overhead = KSZ_INGRESS_TAG_LEN,
  150. .tail_tag = true,
  151. };
  152. DSA_TAG_DRIVER(ksz9893_netdev_ops);
  153. MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
  154. static struct dsa_tag_driver *dsa_tag_driver_array[] = {
  155. &DSA_TAG_DRIVER_NAME(ksz8795_netdev_ops),
  156. &DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
  157. &DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
  158. };
  159. module_dsa_tag_drivers(dsa_tag_driver_array);
  160. MODULE_LICENSE("GPL");