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IB/core: Add VLAN support for IBoE

Add 802.1q VLAN support to IBoE. The VLAN tag is encoded within the
GID derived from a link local address in the following way:

    GID[11] GID[12] contain the VLAN ID when the GID contains a VLAN.

The 3 bits user priority field of the packets are identical to the 3
bits of the SL.

In case of rdma_cm apps, the TOS field is used to generate the SL
field by doing a shift right of 5 bits effectively taking to 3 MS bits
of the TOS field.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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1 parent fa417f7 commit af7bd463761c6abd8ca8d831f9cc0ac19f3b7d4b Eli Cohen committed with Roland Dreier Aug 26, 2010
@@ -1791,6 +1791,7 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
struct sockaddr_in *src_addr = (struct sockaddr_in *)&route->addr.src_addr;
struct sockaddr_in *dst_addr = (struct sockaddr_in *)&route->addr.dst_addr;
struct net_device *ndev = NULL;
+ u16 vid;
if (src_addr->sin_family != dst_addr->sin_family)
return -EINVAL;
@@ -1810,21 +1811,24 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
route->num_paths = 1;
- iboe_mac_to_ll(&route->path_rec->sgid, addr->dev_addr.src_dev_addr);
- iboe_mac_to_ll(&route->path_rec->dgid, addr->dev_addr.dst_dev_addr);
-
- route->path_rec->hop_limit = 1;
- route->path_rec->reversible = 1;
- route->path_rec->pkey = cpu_to_be16(0xffff);
- route->path_rec->mtu_selector = IB_SA_EQ;
-
if (addr->dev_addr.bound_dev_if)
ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
if (!ndev) {
ret = -ENODEV;
goto err2;
}
+ vid = rdma_vlan_dev_vlan_id(ndev);
+
+ iboe_mac_vlan_to_ll(&route->path_rec->sgid, addr->dev_addr.src_dev_addr, vid);
+ iboe_mac_vlan_to_ll(&route->path_rec->dgid, addr->dev_addr.dst_dev_addr, vid);
+
+ route->path_rec->hop_limit = 1;
+ route->path_rec->reversible = 1;
+ route->path_rec->pkey = cpu_to_be16(0xffff);
+ route->path_rec->mtu_selector = IB_SA_EQ;
+ route->path_rec->sl = id_priv->tos >> 5;
+
route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
route->path_rec->rate_selector = IB_SA_EQ;
route->path_rec->rate = iboe_get_rate(ndev);
@@ -587,13 +587,21 @@ static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
struct rdma_route *route)
{
struct rdma_dev_addr *dev_addr;
+ struct net_device *dev;
+ u16 vid = 0;
resp->num_paths = route->num_paths;
switch (route->num_paths) {
case 0:
dev_addr = &route->addr.dev_addr;
- iboe_mac_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
- dev_addr->dst_dev_addr);
+ dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
+ if (dev) {
+ vid = rdma_vlan_dev_vlan_id(dev);
+ dev_put(dev);
+ }
+
+ iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
+ dev_addr->dst_dev_addr, vid);
iboe_addr_get_sgid(dev_addr,
(union ib_gid *) &resp->ib_route[0].sgid);
resp->ib_route[0].pkey = cpu_to_be16(0xffff);
@@ -33,6 +33,7 @@
#include <linux/errno.h>
#include <linux/string.h>
+#include <linux/if_ether.h>
#include <rdma/ib_pack.h>
@@ -103,6 +104,17 @@ static const struct ib_field eth_table[] = {
.size_bits = 16 }
};
+static const struct ib_field vlan_table[] = {
+ { STRUCT_FIELD(vlan, tag),
+ .offset_words = 0,
+ .offset_bits = 0,
+ .size_bits = 16 },
+ { STRUCT_FIELD(vlan, type),
+ .offset_words = 0,
+ .offset_bits = 16,
+ .size_bits = 16 }
+};
+
static const struct ib_field grh_table[] = {
{ STRUCT_FIELD(grh, ip_version),
.offset_words = 0,
@@ -205,13 +217,15 @@ static const struct ib_field deth_table[] = {
* @payload_bytes:Length of packet payload
* @lrh_present: specify if LRH is present
* @eth_present: specify if Eth header is present
+ * @vlan_present: packet is tagged vlan
* @grh_present:GRH flag (if non-zero, GRH will be included)
* @immediate_present: specify if immediate data is present
* @header:Structure to initialize
*/
void ib_ud_header_init(int payload_bytes,
int lrh_present,
int eth_present,
+ int vlan_present,
int grh_present,
int immediate_present,
struct ib_ud_header *header)
@@ -234,6 +248,9 @@ void ib_ud_header_init(int payload_bytes,
header->lrh.packet_length = cpu_to_be16(packet_length);
}
+ if (vlan_present)
+ header->eth.type = cpu_to_be16(ETH_P_8021Q);
+
if (grh_present) {
header->grh.ip_version = 6;
header->grh.payload_length =
@@ -254,6 +271,7 @@ void ib_ud_header_init(int payload_bytes,
header->lrh_present = lrh_present;
header->eth_present = eth_present;
+ header->vlan_present = vlan_present;
header->grh_present = grh_present;
header->immediate_present = immediate_present;
}
@@ -312,6 +330,11 @@ int ib_ud_header_pack(struct ib_ud_header *header,
&header->eth, buf + len);
len += IB_ETH_BYTES;
}
+ if (header->vlan_present) {
+ ib_pack(vlan_table, ARRAY_SIZE(vlan_table),
+ &header->vlan, buf + len);
+ len += IB_VLAN_BYTES;
+ }
if (header->grh_present) {
ib_pack(grh_table, ARRAY_SIZE(grh_table),
&header->grh, buf + len);
@@ -1291,7 +1291,7 @@ static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET;
is_grh = mlx4_ib_ah_grh_present(ah);
- ib_ud_header_init(send_size, !is_eth, is_eth, is_grh, 0, &sqp->ud_header);
+ ib_ud_header_init(send_size, !is_eth, is_eth, 0, is_grh, 0, &sqp->ud_header);
if (!is_eth) {
sqp->ud_header.lrh.service_level =
@@ -1493,7 +1493,7 @@ static int build_mlx_header(struct mthca_dev *dev, struct mthca_sqp *sqp,
int err;
u16 pkey;
- ib_ud_header_init(256, /* assume a MAD */ 1, 0,
+ ib_ud_header_init(256, /* assume a MAD */ 1, 0, 0,
mthca_ah_grh_present(to_mah(wr->wr.ud.ah)), 0,
&sqp->ud_header);
@@ -39,6 +39,7 @@
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
+#include <linux/if_vlan.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_pack.h>
@@ -129,21 +130,41 @@ static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
}
-static inline void iboe_mac_to_ll(union ib_gid *gid, u8 *mac)
+static inline void iboe_mac_vlan_to_ll(union ib_gid *gid, u8 *mac, u16 vid)
{
memset(gid->raw, 0, 16);
*((__be32 *) gid->raw) = cpu_to_be32(0xfe800000);
- gid->raw[12] = 0xfe;
- gid->raw[11] = 0xff;
+ if (vid < 0x1000) {
+ gid->raw[12] = vid & 0xff;
+ gid->raw[11] = vid >> 8;
+ } else {
+ gid->raw[12] = 0xfe;
+ gid->raw[11] = 0xff;
+ }
memcpy(gid->raw + 13, mac + 3, 3);
memcpy(gid->raw + 8, mac, 3);
gid->raw[8] ^= 2;
}
+static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
+{
+ return dev->priv_flags & IFF_802_1Q_VLAN ?
+ vlan_dev_vlan_id(dev) : 0xffff;
+}
+
static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
union ib_gid *gid)
{
- iboe_mac_to_ll(gid, dev_addr->src_dev_addr);
+ struct net_device *dev;
+ u16 vid = 0xffff;
+
+ dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
+ if (dev) {
+ vid = rdma_vlan_dev_vlan_id(dev);
+ dev_put(dev);
+ }
+
+ iboe_mac_vlan_to_ll(gid, dev_addr->src_dev_addr, vid);
}
static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
@@ -244,4 +265,18 @@ static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
mac[i] = addr->s6_addr[i + 10];
}
+static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
+{
+ u16 vid;
+
+ vid = dgid->raw[11] << 8 | dgid->raw[12];
+ return vid < 0x1000 ? vid : 0xffff;
+}
+
+static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
+{
+ return dev->priv_flags & IFF_802_1Q_VLAN ?
+ vlan_dev_real_dev(dev) : 0;
+}
+
#endif /* IB_ADDR_H */
@@ -38,6 +38,7 @@
enum {
IB_LRH_BYTES = 8,
IB_ETH_BYTES = 14,
+ IB_VLAN_BYTES = 4,
IB_GRH_BYTES = 40,
IB_BTH_BYTES = 12,
IB_DETH_BYTES = 8
@@ -219,11 +220,18 @@ struct ib_unpacked_eth {
__be16 type;
};
+struct ib_unpacked_vlan {
+ __be16 tag;
+ __be16 type;
+};
+
struct ib_ud_header {
int lrh_present;
struct ib_unpacked_lrh lrh;
int eth_present;
struct ib_unpacked_eth eth;
+ int vlan_present;
+ struct ib_unpacked_vlan vlan;
int grh_present;
struct ib_unpacked_grh grh;
struct ib_unpacked_bth bth;
@@ -245,6 +253,7 @@ void ib_unpack(const struct ib_field *desc,
void ib_ud_header_init(int payload_bytes,
int lrh_present,
int eth_present,
+ int vlan_present,
int grh_present,
int immediate_present,
struct ib_ud_header *header);

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