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net/smc: allow pnetid-less configuration

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Without hardware pnetid support there must currently be a pnet
table configured to determine the IB device port to be used for SMC
RDMA traffic. This patch enables a setup without pnet table, if
the used handshake interface belongs already to a RoCE port.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2019-02-28 15:10:08 +01:00 committed by David S. Miller
parent 6c97da1415
commit 54903572c2
1 changed files with 41 additions and 1 deletions
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42
net/smc/smc_pnet.c
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@ -754,9 +754,47 @@ static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
return rc;
}
/* if handshake network device belongs to a roce device, return its
* IB device and port
*/
static void smc_pnet_find_rdma_dev(struct net_device *netdev,
struct smc_ib_device **smcibdev,
u8 *ibport, unsigned short vlan_id, u8 gid[])
{
struct smc_ib_device *ibdev;
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
struct net_device *ndev;
int i;
for (i = 1; i <= SMC_MAX_PORTS; i++) {
if (!rdma_is_port_valid(ibdev->ibdev, i))
continue;
if (!ibdev->ibdev->ops.get_netdev)
continue;
ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
if (!ndev)
continue;
dev_put(ndev);
if (netdev == ndev &&
smc_ib_port_active(ibdev, i) &&
!smc_ib_determine_gid(ibdev, i, vlan_id, gid,
NULL)) {
*smcibdev = ibdev;
*ibport = i;
break;
}
}
}
spin_unlock(&smc_ib_devices.lock);
}
/* Determine the corresponding IB device port based on the hardware PNETID.
* Searching stops at the first matching active IB device port with vlan_id
* configured.
* If nothing found, check pnetid table.
* If nothing found, try to use handshake device
*/
static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
struct smc_ib_device **smcibdev,
@ -770,8 +808,10 @@ static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
ndev = pnet_find_base_ndev(ndev);
if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
ndev_pnetid) &&
smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
smc_pnet_find_rdma_dev(ndev, smcibdev, ibport, vlan_id, gid);
return; /* pnetid could not be determined */
}
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {