1 /*
2 * Network device features.
3 *
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10 #ifndef _LINUX_NETDEV_FEATURES_H
11 #define _LINUX_NETDEV_FEATURES_H
12
13 #include <linux/types.h>
14 #include <linux/bitops.h>
15 #include <asm/byteorder.h>
16
17 typedef u64 netdev_features_t;
18
19 enum {
20 NETIF_F_SG_BIT, /* Scatter/gather IO. */
21 NETIF_F_IP_CSUM_BIT, /* Can checksum TCP/UDP over IPv4. */
22 __UNUSED_NETIF_F_1,
23 NETIF_F_HW_CSUM_BIT, /* Can checksum all the packets. */
24 NETIF_F_IPV6_CSUM_BIT, /* Can checksum TCP/UDP over IPV6 */
25 NETIF_F_HIGHDMA_BIT, /* Can DMA to high memory. */
26 NETIF_F_FRAGLIST_BIT, /* Scatter/gather IO. */
27 NETIF_F_HW_VLAN_CTAG_TX_BIT, /* Transmit VLAN CTAG HW acceleration */
28 NETIF_F_HW_VLAN_CTAG_RX_BIT, /* Receive VLAN CTAG HW acceleration */
29 NETIF_F_HW_VLAN_CTAG_FILTER_BIT,/* Receive filtering on VLAN CTAGs */
30 NETIF_F_VLAN_CHALLENGED_BIT, /* Device cannot handle VLAN packets */
31 NETIF_F_GSO_BIT, /* Enable software GSO. */
32 NETIF_F_LLTX_BIT, /* LockLess TX - deprecated. Please */
33 /* do not use LLTX in new drivers */
34 NETIF_F_NETNS_LOCAL_BIT, /* Does not change network namespaces */
35 NETIF_F_GRO_BIT, /* Generic receive offload */
36 NETIF_F_LRO_BIT, /* large receive offload */
37
38 /**/NETIF_F_GSO_SHIFT, /* keep the order of SKB_GSO_* bits */
39 NETIF_F_TSO_BIT /* ... TCPv4 segmentation */
40 = NETIF_F_GSO_SHIFT,
41 NETIF_F_UFO_BIT, /* ... UDPv4 fragmentation */
42 NETIF_F_GSO_ROBUST_BIT, /* ... ->SKB_GSO_DODGY */
43 NETIF_F_TSO_ECN_BIT, /* ... TCP ECN support */
44 NETIF_F_TSO6_BIT, /* ... TCPv6 segmentation */
45 NETIF_F_FSO_BIT, /* ... FCoE segmentation */
46 NETIF_F_GSO_GRE_BIT, /* ... GRE with TSO */
47 NETIF_F_GSO_GRE_CSUM_BIT, /* ... GRE with csum with TSO */
48 NETIF_F_GSO_IPIP_BIT, /* ... IPIP tunnel with TSO */
49 NETIF_F_GSO_SIT_BIT, /* ... SIT tunnel with TSO */
50 NETIF_F_GSO_UDP_TUNNEL_BIT, /* ... UDP TUNNEL with TSO */
51 NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT,/* ... UDP TUNNEL with TSO & CSUM */
52 NETIF_F_GSO_TUNNEL_REMCSUM_BIT, /* ... TUNNEL with TSO & REMCSUM */
53 /**/NETIF_F_GSO_LAST = /* last bit, see GSO_MASK */
54 NETIF_F_GSO_TUNNEL_REMCSUM_BIT,
55
56 NETIF_F_FCOE_CRC_BIT, /* FCoE CRC32 */
57 NETIF_F_SCTP_CSUM_BIT, /* SCTP checksum offload */
58 NETIF_F_FCOE_MTU_BIT, /* Supports max FCoE MTU, 2158 bytes*/
59 NETIF_F_NTUPLE_BIT, /* N-tuple filters supported */
60 NETIF_F_RXHASH_BIT, /* Receive hashing offload */
61 NETIF_F_RXCSUM_BIT, /* Receive checksumming offload */
62 NETIF_F_NOCACHE_COPY_BIT, /* Use no-cache copyfromuser */
63 NETIF_F_LOOPBACK_BIT, /* Enable loopback */
64 NETIF_F_RXFCS_BIT, /* Append FCS to skb pkt data */
65 NETIF_F_RXALL_BIT, /* Receive errored frames too */
66 NETIF_F_HW_VLAN_STAG_TX_BIT, /* Transmit VLAN STAG HW acceleration */
67 NETIF_F_HW_VLAN_STAG_RX_BIT, /* Receive VLAN STAG HW acceleration */
68 NETIF_F_HW_VLAN_STAG_FILTER_BIT,/* Receive filtering on VLAN STAGs */
69 NETIF_F_HW_L2FW_DOFFLOAD_BIT, /* Allow L2 Forwarding in Hardware */
70 NETIF_F_BUSY_POLL_BIT, /* Busy poll */
71
72 /*
73 * Add your fresh new feature above and remember to update
74 * netdev_features_strings[] in net/core/ethtool.c and maybe
75 * some feature mask #defines below. Please also describe it
76 * in Documentation/networking/netdev-features.txt.
77 */
78
79 /**/NETDEV_FEATURE_COUNT
80 };
81
82 /* copy'n'paste compression ;) */
83 #define __NETIF_F_BIT(bit) ((netdev_features_t)1 << (bit))
84 #define __NETIF_F(name) __NETIF_F_BIT(NETIF_F_##name##_BIT)
85
86 #define NETIF_F_FCOE_CRC __NETIF_F(FCOE_CRC)
87 #define NETIF_F_FCOE_MTU __NETIF_F(FCOE_MTU)
88 #define NETIF_F_FRAGLIST __NETIF_F(FRAGLIST)
89 #define NETIF_F_FSO __NETIF_F(FSO)
90 #define NETIF_F_GRO __NETIF_F(GRO)
91 #define NETIF_F_GSO __NETIF_F(GSO)
92 #define NETIF_F_GSO_ROBUST __NETIF_F(GSO_ROBUST)
93 #define NETIF_F_HIGHDMA __NETIF_F(HIGHDMA)
94 #define NETIF_F_HW_CSUM __NETIF_F(HW_CSUM)
95 #define NETIF_F_HW_VLAN_CTAG_FILTER __NETIF_F(HW_VLAN_CTAG_FILTER)
96 #define NETIF_F_HW_VLAN_CTAG_RX __NETIF_F(HW_VLAN_CTAG_RX)
97 #define NETIF_F_HW_VLAN_CTAG_TX __NETIF_F(HW_VLAN_CTAG_TX)
98 #define NETIF_F_IP_CSUM __NETIF_F(IP_CSUM)
99 #define NETIF_F_IPV6_CSUM __NETIF_F(IPV6_CSUM)
100 #define NETIF_F_LLTX __NETIF_F(LLTX)
101 #define NETIF_F_LOOPBACK __NETIF_F(LOOPBACK)
102 #define NETIF_F_LRO __NETIF_F(LRO)
103 #define NETIF_F_NETNS_LOCAL __NETIF_F(NETNS_LOCAL)
104 #define NETIF_F_NOCACHE_COPY __NETIF_F(NOCACHE_COPY)
105 #define NETIF_F_NTUPLE __NETIF_F(NTUPLE)
106 #define NETIF_F_RXCSUM __NETIF_F(RXCSUM)
107 #define NETIF_F_RXHASH __NETIF_F(RXHASH)
108 #define NETIF_F_SCTP_CSUM __NETIF_F(SCTP_CSUM)
109 #define NETIF_F_SG __NETIF_F(SG)
110 #define NETIF_F_TSO6 __NETIF_F(TSO6)
111 #define NETIF_F_TSO_ECN __NETIF_F(TSO_ECN)
112 #define NETIF_F_TSO __NETIF_F(TSO)
113 #define NETIF_F_UFO __NETIF_F(UFO)
114 #define NETIF_F_VLAN_CHALLENGED __NETIF_F(VLAN_CHALLENGED)
115 #define NETIF_F_RXFCS __NETIF_F(RXFCS)
116 #define NETIF_F_RXALL __NETIF_F(RXALL)
117 #define NETIF_F_GSO_GRE __NETIF_F(GSO_GRE)
118 #define NETIF_F_GSO_GRE_CSUM __NETIF_F(GSO_GRE_CSUM)
119 #define NETIF_F_GSO_IPIP __NETIF_F(GSO_IPIP)
120 #define NETIF_F_GSO_SIT __NETIF_F(GSO_SIT)
121 #define NETIF_F_GSO_UDP_TUNNEL __NETIF_F(GSO_UDP_TUNNEL)
122 #define NETIF_F_GSO_UDP_TUNNEL_CSUM __NETIF_F(GSO_UDP_TUNNEL_CSUM)
123 #define NETIF_F_GSO_TUNNEL_REMCSUM __NETIF_F(GSO_TUNNEL_REMCSUM)
124 #define NETIF_F_HW_VLAN_STAG_FILTER __NETIF_F(HW_VLAN_STAG_FILTER)
125 #define NETIF_F_HW_VLAN_STAG_RX __NETIF_F(HW_VLAN_STAG_RX)
126 #define NETIF_F_HW_VLAN_STAG_TX __NETIF_F(HW_VLAN_STAG_TX)
127 #define NETIF_F_HW_L2FW_DOFFLOAD __NETIF_F(HW_L2FW_DOFFLOAD)
128 #define NETIF_F_BUSY_POLL __NETIF_F(BUSY_POLL)
129
130 /* Finds the next feature with the highest number of the range of start till 0.
131 */
find_next_netdev_feature(u64 feature,unsigned long start)132 static inline int find_next_netdev_feature(u64 feature, unsigned long start)
133 {
134 /* like BITMAP_LAST_WORD_MASK() for u64
135 * this sets the most significant 64 - start to 0.
136 */
137 feature &= ~0ULL >> (-start & ((sizeof(feature) * 8) - 1));
138
139 return fls64(feature) - 1;
140 }
141
142 /* This goes for the MSB to the LSB through the set feature bits,
143 * mask_addr should be a u64 and bit an int
144 */
145 #define for_each_netdev_feature(mask_addr, bit) \
146 for ((bit) = find_next_netdev_feature((mask_addr), \
147 NETDEV_FEATURE_COUNT); \
148 (bit) >= 0; \
149 (bit) = find_next_netdev_feature((mask_addr), (bit) - 1))
150
151 /* Features valid for ethtool to change */
152 /* = all defined minus driver/device-class-related */
153 #define NETIF_F_NEVER_CHANGE (NETIF_F_VLAN_CHALLENGED | \
154 NETIF_F_LLTX | NETIF_F_NETNS_LOCAL)
155
156 /* remember that ((t)1 << t_BITS) is undefined in C99 */
157 #define NETIF_F_ETHTOOL_BITS ((__NETIF_F_BIT(NETDEV_FEATURE_COUNT - 1) | \
158 (__NETIF_F_BIT(NETDEV_FEATURE_COUNT - 1) - 1)) & \
159 ~NETIF_F_NEVER_CHANGE)
160
161 /* Segmentation offload feature mask */
162 #define NETIF_F_GSO_MASK (__NETIF_F_BIT(NETIF_F_GSO_LAST + 1) - \
163 __NETIF_F_BIT(NETIF_F_GSO_SHIFT))
164
165 /* List of features with software fallbacks. */
166 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \
167 NETIF_F_TSO6 | NETIF_F_UFO)
168
169 #define NETIF_F_GEN_CSUM NETIF_F_HW_CSUM
170 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
171 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
172 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
173
174 #define NETIF_F_ALL_TSO (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN)
175
176 #define NETIF_F_ALL_FCOE (NETIF_F_FCOE_CRC | NETIF_F_FCOE_MTU | \
177 NETIF_F_FSO)
178
179 /*
180 * If one device supports one of these features, then enable them
181 * for all in netdev_increment_features.
182 */
183 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
184 NETIF_F_SG | NETIF_F_HIGHDMA | \
185 NETIF_F_FRAGLIST | NETIF_F_VLAN_CHALLENGED)
186
187 /*
188 * If one device doesn't support one of these features, then disable it
189 * for all in netdev_increment_features.
190 */
191 #define NETIF_F_ALL_FOR_ALL (NETIF_F_NOCACHE_COPY | NETIF_F_FSO)
192
193 /*
194 * If upper/master device has these features disabled, they must be disabled
195 * on all lower/slave devices as well.
196 */
197 #define NETIF_F_UPPER_DISABLES NETIF_F_LRO
198
199 /* changeable features with no special hardware requirements */
200 #define NETIF_F_SOFT_FEATURES (NETIF_F_GSO | NETIF_F_GRO)
201
202 #define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \
203 NETIF_F_HW_VLAN_CTAG_RX | \
204 NETIF_F_HW_VLAN_CTAG_TX | \
205 NETIF_F_HW_VLAN_STAG_FILTER | \
206 NETIF_F_HW_VLAN_STAG_RX | \
207 NETIF_F_HW_VLAN_STAG_TX)
208
209 #define NETIF_F_GSO_ENCAP_ALL (NETIF_F_GSO_GRE | \
210 NETIF_F_GSO_GRE_CSUM | \
211 NETIF_F_GSO_IPIP | \
212 NETIF_F_GSO_SIT | \
213 NETIF_F_GSO_UDP_TUNNEL | \
214 NETIF_F_GSO_UDP_TUNNEL_CSUM)
215
216 #endif /* _LINUX_NETDEV_FEATURES_H */
217