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net/smc: allow pnetid-less configuration
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>
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@ -754,9 +754,47 @@ static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
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return rc;
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}
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/* if handshake network device belongs to a roce device, return its
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* IB device and port
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*/
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static void smc_pnet_find_rdma_dev(struct net_device *netdev,
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struct smc_ib_device **smcibdev,
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u8 *ibport, unsigned short vlan_id, u8 gid[])
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{
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struct smc_ib_device *ibdev;
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spin_lock(&smc_ib_devices.lock);
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list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
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struct net_device *ndev;
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int i;
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for (i = 1; i <= SMC_MAX_PORTS; i++) {
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if (!rdma_is_port_valid(ibdev->ibdev, i))
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continue;
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if (!ibdev->ibdev->ops.get_netdev)
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continue;
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ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
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if (!ndev)
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continue;
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dev_put(ndev);
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if (netdev == ndev &&
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smc_ib_port_active(ibdev, i) &&
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!smc_ib_determine_gid(ibdev, i, vlan_id, gid,
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NULL)) {
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*smcibdev = ibdev;
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*ibport = i;
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break;
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}
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}
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}
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spin_unlock(&smc_ib_devices.lock);
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}
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/* Determine the corresponding IB device port based on the hardware PNETID.
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* Searching stops at the first matching active IB device port with vlan_id
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* configured.
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* If nothing found, check pnetid table.
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* If nothing found, try to use handshake device
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*/
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static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
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struct smc_ib_device **smcibdev,
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@ -770,8 +808,10 @@ static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
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ndev = pnet_find_base_ndev(ndev);
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if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
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ndev_pnetid) &&
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smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
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smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
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smc_pnet_find_rdma_dev(ndev, smcibdev, ibport, vlan_id, gid);
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return; /* pnetid could not be determined */
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}
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spin_lock(&smc_ib_devices.lock);
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list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
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