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