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Diffstat (limited to 'drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c')
-rw-r--r--drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c b/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c
new file mode 100644
index 000000000000..905f39dda5aa
--- /dev/null
+++ b/drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c
@@ -0,0 +1,389 @@
+/*
+ * Copyright(c) 2017 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ * This file contains OPA Virtual Network Interface Controller (VNIC) driver
+ * netdev functionality.
+ */
+
+#include <linux/module.h>
+#include <linux/if_vlan.h>
+#include <linux/crc32.h>
+
+#include "opa_vnic_internal.h"
+
+#define OPA_TX_TIMEOUT_MS 1000
+
+#define OPA_VNIC_SKB_HEADROOM \
+ ALIGN((OPA_VNIC_HDR_LEN + OPA_VNIC_SKB_MDATA_LEN), 8)
+
+/* This function is overloaded for opa_vnic specific implementation */
+static void opa_vnic_get_stats64(struct net_device *netdev,
+ struct rtnl_link_stats64 *stats)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ struct opa_vnic_stats vstats;
+
+ memset(&vstats, 0, sizeof(vstats));
+ mutex_lock(&adapter->stats_lock);
+ adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats);
+ mutex_unlock(&adapter->stats_lock);
+ memcpy(stats, &vstats.netstats, sizeof(*stats));
+}
+
+/* opa_netdev_start_xmit - transmit function */
+static netdev_tx_t opa_netdev_start_xmit(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+
+ v_dbg("xmit: queue %d skb len %d\n", skb->queue_mapping, skb->len);
+ /* pad to ensure mininum ethernet packet length */
+ if (unlikely(skb->len < ETH_ZLEN)) {
+ if (skb_padto(skb, ETH_ZLEN))
+ return NETDEV_TX_OK;
+
+ skb_put(skb, ETH_ZLEN - skb->len);
+ }
+
+ opa_vnic_encap_skb(adapter, skb);
+ return adapter->rn_ops->ndo_start_xmit(skb, netdev);
+}
+
+static u16 opa_vnic_select_queue(struct net_device *netdev, struct sk_buff *skb,
+ void *accel_priv,
+ select_queue_fallback_t fallback)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ struct opa_vnic_skb_mdata *mdata;
+ int rc;
+
+ /* pass entropy and vl as metadata in skb */
+ mdata = (struct opa_vnic_skb_mdata *)skb_push(skb, sizeof(*mdata));
+ mdata->entropy = opa_vnic_calc_entropy(adapter, skb);
+ mdata->vl = opa_vnic_get_vl(adapter, skb);
+ rc = adapter->rn_ops->ndo_select_queue(netdev, skb,
+ accel_priv, fallback);
+ skb_pull(skb, sizeof(*mdata));
+ return rc;
+}
+
+/* opa_vnic_process_vema_config - process vema configuration updates */
+void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter)
+{
+ struct __opa_veswport_info *info = &adapter->info;
+ struct rdma_netdev *rn = netdev_priv(adapter->netdev);
+ u8 port_num[OPA_VESW_MAX_NUM_DEF_PORT] = { 0 };
+ struct net_device *netdev = adapter->netdev;
+ u8 i, port_count = 0;
+ u16 port_mask;
+
+ /* If the base_mac_addr is changed, update the interface mac address */
+ if (memcmp(info->vport.base_mac_addr, adapter->vema_mac_addr,
+ ARRAY_SIZE(info->vport.base_mac_addr))) {
+ struct sockaddr saddr;
+
+ memcpy(saddr.sa_data, info->vport.base_mac_addr,
+ ARRAY_SIZE(info->vport.base_mac_addr));
+ mutex_lock(&adapter->lock);
+ eth_mac_addr(netdev, &saddr);
+ memcpy(adapter->vema_mac_addr,
+ info->vport.base_mac_addr, ETH_ALEN);
+ mutex_unlock(&adapter->lock);
+ }
+
+ rn->set_id(netdev, info->vesw.vesw_id);
+
+ /* Handle MTU limit change */
+ rtnl_lock();
+ netdev->max_mtu = max_t(unsigned int, info->vesw.eth_mtu_non_vlan,
+ netdev->min_mtu);
+ if (netdev->mtu > netdev->max_mtu)
+ dev_set_mtu(netdev, netdev->max_mtu);
+ rtnl_unlock();
+
+ /* Update flow to default port redirection table */
+ port_mask = info->vesw.def_port_mask;
+ for (i = 0; i < OPA_VESW_MAX_NUM_DEF_PORT; i++) {
+ if (port_mask & 1)
+ port_num[port_count++] = i;
+ port_mask >>= 1;
+ }
+
+ /*
+ * Build the flow table. Flow table is required when destination LID
+ * is not available. Up to OPA_VNIC_FLOW_TBL_SIZE flows supported.
+ * Each flow need a default port number to get its dlid from the
+ * u_ucast_dlid array.
+ */
+ for (i = 0; i < OPA_VNIC_FLOW_TBL_SIZE; i++)
+ adapter->flow_tbl[i] = port_count ? port_num[i % port_count] :
+ OPA_VNIC_INVALID_PORT;
+
+ /* Operational state can only be DROP_ALL or FORWARDING */
+ if (info->vport.config_state == OPA_VNIC_STATE_FORWARDING) {
+ info->vport.oper_state = OPA_VNIC_STATE_FORWARDING;
+ netif_dormant_off(netdev);
+ } else {
+ info->vport.oper_state = OPA_VNIC_STATE_DROP_ALL;
+ netif_dormant_on(netdev);
+ }
+}
+
+/*
+ * Set the power on default values in adapter's vema interface structure.
+ */
+static inline void opa_vnic_set_pod_values(struct opa_vnic_adapter *adapter)
+{
+ adapter->info.vport.max_mac_tbl_ent = OPA_VNIC_MAC_TBL_MAX_ENTRIES;
+ adapter->info.vport.max_smac_ent = OPA_VNIC_MAX_SMAC_LIMIT;
+ adapter->info.vport.config_state = OPA_VNIC_STATE_DROP_ALL;
+ adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
+}
+
+/* opa_vnic_set_mac_addr - change mac address */
+static int opa_vnic_set_mac_addr(struct net_device *netdev, void *addr)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ struct sockaddr *sa = addr;
+ int rc;
+
+ if (!memcmp(netdev->dev_addr, sa->sa_data, ETH_ALEN))
+ return 0;
+
+ mutex_lock(&adapter->lock);
+ rc = eth_mac_addr(netdev, addr);
+ mutex_unlock(&adapter->lock);
+ if (rc)
+ return rc;
+
+ adapter->info.vport.uc_macs_gen_count++;
+ opa_vnic_vema_report_event(adapter,
+ OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
+ return 0;
+}
+
+/*
+ * opa_vnic_mac_send_event - post event on possible mac list exchange
+ * Send trap when digest from uc/mc mac list differs from previous run.
+ * Digest is evaluated similar to how cksum does.
+ */
+static void opa_vnic_mac_send_event(struct net_device *netdev, u8 event)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ struct netdev_hw_addr *ha;
+ struct netdev_hw_addr_list *hw_list;
+ u32 *ref_crc;
+ u32 l, crc = 0;
+
+ switch (event) {
+ case OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE:
+ hw_list = &netdev->uc;
+ adapter->info.vport.uc_macs_gen_count++;
+ ref_crc = &adapter->umac_hash;
+ break;
+ case OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE:
+ hw_list = &netdev->mc;
+ adapter->info.vport.mc_macs_gen_count++;
+ ref_crc = &adapter->mmac_hash;
+ break;
+ default:
+ return;
+ }
+ netdev_hw_addr_list_for_each(ha, hw_list) {
+ crc = crc32_le(crc, ha->addr, ETH_ALEN);
+ }
+ l = netdev_hw_addr_list_count(hw_list) * ETH_ALEN;
+ crc = ~crc32_le(crc, (void *)&l, sizeof(l));
+
+ if (crc != *ref_crc) {
+ *ref_crc = crc;
+ opa_vnic_vema_report_event(adapter, event);
+ }
+}
+
+/* opa_vnic_set_rx_mode - handle uc/mc mac list change */
+static void opa_vnic_set_rx_mode(struct net_device *netdev)
+{
+ opa_vnic_mac_send_event(netdev,
+ OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
+
+ opa_vnic_mac_send_event(netdev,
+ OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE);
+}
+
+/* opa_netdev_open - activate network interface */
+static int opa_netdev_open(struct net_device *netdev)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ int rc;
+
+ rc = adapter->rn_ops->ndo_open(adapter->netdev);
+ if (rc) {
+ v_dbg("open failed %d\n", rc);
+ return rc;
+ }
+
+ /* Update eth link status and send trap */
+ adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_UP;
+ opa_vnic_vema_report_event(adapter,
+ OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
+ return 0;
+}
+
+/* opa_netdev_close - disable network interface */
+static int opa_netdev_close(struct net_device *netdev)
+{
+ struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
+ int rc;
+
+ rc = adapter->rn_ops->ndo_stop(adapter->netdev);
+ if (rc) {
+ v_dbg("close failed %d\n", rc);
+ return rc;
+ }
+
+ /* Update eth link status and send trap */
+ adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
+ opa_vnic_vema_report_event(adapter,
+ OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
+ return 0;
+}
+
+/* netdev ops */
+static const struct net_device_ops opa_netdev_ops = {
+ .ndo_open = opa_netdev_open,
+ .ndo_stop = opa_netdev_close,
+ .ndo_start_xmit = opa_netdev_start_xmit,
+ .ndo_get_stats64 = opa_vnic_get_stats64,
+ .ndo_set_rx_mode = opa_vnic_set_rx_mode,
+ .ndo_select_queue = opa_vnic_select_queue,
+ .ndo_set_mac_address = opa_vnic_set_mac_addr,
+};
+
+/* opa_vnic_add_netdev - create vnic netdev interface */
+struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
+ u8 port_num, u8 vport_num)
+{
+ struct opa_vnic_adapter *adapter;
+ struct net_device *netdev;
+ struct rdma_netdev *rn;
+ int rc;
+
+ netdev = ibdev->alloc_rdma_netdev(ibdev, port_num,
+ RDMA_NETDEV_OPA_VNIC,
+ "veth%d", NET_NAME_UNKNOWN,
+ ether_setup);
+ if (!netdev)
+ return ERR_PTR(-ENOMEM);
+ else if (IS_ERR(netdev))
+ return ERR_CAST(netdev);
+
+ adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
+ if (!adapter) {
+ rc = -ENOMEM;
+ goto adapter_err;
+ }
+
+ rn = netdev_priv(netdev);
+ rn->clnt_priv = adapter;
+ rn->hca = ibdev;
+ rn->port_num = port_num;
+ adapter->netdev = netdev;
+ adapter->ibdev = ibdev;
+ adapter->port_num = port_num;
+ adapter->vport_num = vport_num;
+ adapter->rn_ops = netdev->netdev_ops;
+
+ netdev->netdev_ops = &opa_netdev_ops;
+ netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM;
+ mutex_init(&adapter->lock);
+ mutex_init(&adapter->mactbl_lock);
+ mutex_init(&adapter->stats_lock);
+
+ SET_NETDEV_DEV(netdev, ibdev->dev.parent);
+
+ opa_vnic_set_ethtool_ops(netdev);
+
+ opa_vnic_set_pod_values(adapter);
+
+ rc = register_netdev(netdev);
+ if (rc)
+ goto netdev_err;
+
+ netif_carrier_off(netdev);
+ netif_dormant_on(netdev);
+ v_info("initialized\n");
+
+ return adapter;
+netdev_err:
+ mutex_destroy(&adapter->lock);
+ mutex_destroy(&adapter->mactbl_lock);
+ mutex_destroy(&adapter->stats_lock);
+ kfree(adapter);
+adapter_err:
+ ibdev->free_rdma_netdev(netdev);
+
+ return ERR_PTR(rc);
+}
+
+/* opa_vnic_rem_netdev - remove vnic netdev interface */
+void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+ struct ib_device *ibdev = adapter->ibdev;
+
+ v_info("removing\n");
+ unregister_netdev(netdev);
+ opa_vnic_release_mac_tbl(adapter);
+ mutex_destroy(&adapter->lock);
+ mutex_destroy(&adapter->mactbl_lock);
+ mutex_destroy(&adapter->stats_lock);
+ kfree(adapter);
+ ibdev->free_rdma_netdev(netdev);
+}