net/smc: retrieve v2 gid from IB device
In smc_ib.c, scan for RoCE devices that support UDP encapsulation.
Find an eligible device and check that there is a route to the
remote peer.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 9f72910..d15bacb 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -17,6 +17,7 @@
#include <linux/scatterlist.h>
#include <linux/wait.h>
#include <linux/mutex.h>
+#include <linux/inetdevice.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
@@ -62,16 +63,23 @@ static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
struct ib_qp_attr qp_attr;
+ u8 hop_lim = 1;
memset(&qp_attr, 0, sizeof(qp_attr));
qp_attr.qp_state = IB_QPS_RTR;
qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
- rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0);
+ if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
+ hop_lim = IPV6_DEFAULT_HOPLIMIT;
+ rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, hop_lim, 0);
rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
- memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
- sizeof(lnk->peer_mac));
+ if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
+ memcpy(&qp_attr.ah_attr.roce.dmac, lnk->lgr->nexthop_mac,
+ sizeof(lnk->lgr->nexthop_mac));
+ else
+ memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
+ sizeof(lnk->peer_mac));
qp_attr.dest_qp_num = lnk->peer_qpn;
qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
@@ -210,9 +218,54 @@ int smc_ib_find_route(__be32 saddr, __be32 daddr,
return -ENOENT;
}
+static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
+ const struct ib_gid_attr *attr,
+ u8 gid[], u8 *sgid_index,
+ struct smc_init_info_smcrv2 *smcrv2)
+{
+ if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
+ if (gid)
+ memcpy(gid, &attr->gid, SMC_GID_SIZE);
+ if (sgid_index)
+ *sgid_index = attr->index;
+ return 0;
+ }
+ if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
+ smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
+ struct in_device *in_dev = __in_dev_get_rcu(ndev);
+ const struct in_ifaddr *ifa;
+ bool subnet_match = false;
+
+ if (!in_dev)
+ goto out;
+ in_dev_for_each_ifa_rcu(ifa, in_dev) {
+ if (!inet_ifa_match(smcrv2->saddr, ifa))
+ continue;
+ subnet_match = true;
+ break;
+ }
+ if (!subnet_match)
+ goto out;
+ if (smcrv2->daddr && smc_ib_find_route(smcrv2->saddr,
+ smcrv2->daddr,
+ smcrv2->nexthop_mac,
+ &smcrv2->uses_gateway))
+ goto out;
+
+ if (gid)
+ memcpy(gid, &attr->gid, SMC_GID_SIZE);
+ if (sgid_index)
+ *sgid_index = attr->index;
+ return 0;
+ }
+out:
+ return -ENODEV;
+}
+
/* determine the gid for an ib-device port and vlan id */
int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
- unsigned short vlan_id, u8 gid[], u8 *sgid_index)
+ unsigned short vlan_id, u8 gid[], u8 *sgid_index,
+ struct smc_init_info_smcrv2 *smcrv2)
{
const struct ib_gid_attr *attr;
const struct net_device *ndev;
@@ -228,15 +281,13 @@ int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
if (!IS_ERR(ndev) &&
((!vlan_id && !is_vlan_dev(ndev)) ||
(vlan_id && is_vlan_dev(ndev) &&
- vlan_dev_vlan_id(ndev) == vlan_id)) &&
- attr->gid_type == IB_GID_TYPE_ROCE) {
- rcu_read_unlock();
- if (gid)
- memcpy(gid, &attr->gid, SMC_GID_SIZE);
- if (sgid_index)
- *sgid_index = attr->index;
- rdma_put_gid_attr(attr);
- return 0;
+ vlan_dev_vlan_id(ndev) == vlan_id))) {
+ if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
+ sgid_index, smcrv2)) {
+ rcu_read_unlock();
+ rdma_put_gid_attr(attr);
+ return 0;
+ }
}
rcu_read_unlock();
rdma_put_gid_attr(attr);