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![Karsten Graul](/assets/img/avatar_default.png)
dev_name() was called with dev.parent as argument but without to
NULL-check it before.
Solve this by checking the pointer before the call to dev_name().
Fixes: af5f60c7e3
("net/smc: allow PCI IDs as ib device names in the pnet table")
Reported-by: syzbot+03e3e228510223dabd34@syzkaller.appspotmail.com
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1204 lines
30 KiB
C
1204 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Generic netlink support functions to configure an SMC-R PNET table
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Thomas Richter <tmricht@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/mutex.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <uapi/linux/if.h>
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#include <uapi/linux/smc.h>
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#include <rdma/ib_verbs.h>
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#include <net/netns/generic.h>
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#include "smc_netns.h"
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#include "smc_pnet.h"
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#include "smc_ib.h"
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#include "smc_ism.h"
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#include "smc_core.h"
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static struct net_device *__pnet_find_base_ndev(struct net_device *ndev);
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static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
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static const struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
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[SMC_PNETID_NAME] = {
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.type = NLA_NUL_STRING,
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.len = SMC_MAX_PNETID_LEN
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},
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[SMC_PNETID_ETHNAME] = {
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.type = NLA_NUL_STRING,
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.len = IFNAMSIZ - 1
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},
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[SMC_PNETID_IBNAME] = {
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.type = NLA_NUL_STRING,
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.len = IB_DEVICE_NAME_MAX - 1
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},
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[SMC_PNETID_IBPORT] = { .type = NLA_U8 }
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};
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static struct genl_family smc_pnet_nl_family;
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enum smc_pnet_nametype {
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SMC_PNET_ETH = 1,
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SMC_PNET_IB = 2,
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};
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/* pnet entry stored in pnet table */
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struct smc_pnetentry {
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struct list_head list;
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char pnet_name[SMC_MAX_PNETID_LEN + 1];
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enum smc_pnet_nametype type;
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union {
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struct {
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char eth_name[IFNAMSIZ + 1];
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struct net_device *ndev;
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netdevice_tracker dev_tracker;
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};
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struct {
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char ib_name[IB_DEVICE_NAME_MAX + 1];
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u8 ib_port;
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};
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};
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};
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/* Check if the pnetid is set */
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bool smc_pnet_is_pnetid_set(u8 *pnetid)
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{
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if (pnetid[0] == 0 || pnetid[0] == _S)
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return false;
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return true;
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}
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/* Check if two given pnetids match */
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static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
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{
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int i;
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for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
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if ((pnetid1[i] == 0 || pnetid1[i] == _S) &&
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(pnetid2[i] == 0 || pnetid2[i] == _S))
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break;
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if (pnetid1[i] != pnetid2[i])
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return false;
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}
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return true;
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}
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/* Remove a pnetid from the pnet table.
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*/
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static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
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{
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struct smc_pnetentry *pnetelem, *tmp_pe;
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struct smc_pnettable *pnettable;
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struct smc_ib_device *ibdev;
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struct smcd_dev *smcd_dev;
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struct smc_net *sn;
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int rc = -ENOENT;
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int ibport;
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/* get pnettable for namespace */
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sn = net_generic(net, smc_net_id);
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pnettable = &sn->pnettable;
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/* remove table entry */
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mutex_lock(&pnettable->lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
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list) {
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if (!pnet_name ||
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smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
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list_del(&pnetelem->list);
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if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev) {
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dev_put_track(pnetelem->ndev, &pnetelem->dev_tracker);
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pr_warn_ratelimited("smc: net device %s "
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"erased user defined "
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"pnetid %.16s\n",
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pnetelem->eth_name,
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pnetelem->pnet_name);
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}
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kfree(pnetelem);
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rc = 0;
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}
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}
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mutex_unlock(&pnettable->lock);
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/* if this is not the initial namespace, stop here */
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if (net != &init_net)
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return rc;
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/* remove ib devices */
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mutex_lock(&smc_ib_devices.mutex);
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list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
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for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
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if (ibdev->pnetid_by_user[ibport] &&
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(!pnet_name ||
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smc_pnet_match(pnet_name,
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ibdev->pnetid[ibport]))) {
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pr_warn_ratelimited("smc: ib device %s ibport "
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"%d erased user defined "
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"pnetid %.16s\n",
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ibdev->ibdev->name,
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ibport + 1,
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ibdev->pnetid[ibport]);
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memset(ibdev->pnetid[ibport], 0,
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SMC_MAX_PNETID_LEN);
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ibdev->pnetid_by_user[ibport] = false;
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rc = 0;
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}
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}
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}
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mutex_unlock(&smc_ib_devices.mutex);
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/* remove smcd devices */
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mutex_lock(&smcd_dev_list.mutex);
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list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
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if (smcd_dev->pnetid_by_user &&
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(!pnet_name ||
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smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
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pr_warn_ratelimited("smc: smcd device %s "
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"erased user defined pnetid "
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"%.16s\n", dev_name(&smcd_dev->dev),
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smcd_dev->pnetid);
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memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
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smcd_dev->pnetid_by_user = false;
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rc = 0;
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}
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}
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mutex_unlock(&smcd_dev_list.mutex);
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return rc;
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}
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/* Add the reference to a given network device to the pnet table.
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*/
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static int smc_pnet_add_by_ndev(struct net_device *ndev)
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{
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struct smc_pnetentry *pnetelem, *tmp_pe;
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struct smc_pnettable *pnettable;
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struct net *net = dev_net(ndev);
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struct smc_net *sn;
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int rc = -ENOENT;
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/* get pnettable for namespace */
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sn = net_generic(net, smc_net_id);
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pnettable = &sn->pnettable;
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mutex_lock(&pnettable->lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
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if (pnetelem->type == SMC_PNET_ETH && !pnetelem->ndev &&
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!strncmp(pnetelem->eth_name, ndev->name, IFNAMSIZ)) {
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dev_hold_track(ndev, &pnetelem->dev_tracker, GFP_ATOMIC);
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pnetelem->ndev = ndev;
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rc = 0;
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pr_warn_ratelimited("smc: adding net device %s with "
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"user defined pnetid %.16s\n",
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pnetelem->eth_name,
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pnetelem->pnet_name);
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break;
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}
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}
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mutex_unlock(&pnettable->lock);
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return rc;
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}
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/* Remove the reference to a given network device from the pnet table.
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*/
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static int smc_pnet_remove_by_ndev(struct net_device *ndev)
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{
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struct smc_pnetentry *pnetelem, *tmp_pe;
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struct smc_pnettable *pnettable;
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struct net *net = dev_net(ndev);
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struct smc_net *sn;
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int rc = -ENOENT;
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/* get pnettable for namespace */
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sn = net_generic(net, smc_net_id);
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pnettable = &sn->pnettable;
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mutex_lock(&pnettable->lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
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if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev == ndev) {
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dev_put_track(pnetelem->ndev, &pnetelem->dev_tracker);
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pnetelem->ndev = NULL;
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rc = 0;
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pr_warn_ratelimited("smc: removing net device %s with "
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"user defined pnetid %.16s\n",
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pnetelem->eth_name,
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pnetelem->pnet_name);
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break;
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}
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}
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mutex_unlock(&pnettable->lock);
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return rc;
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}
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/* Apply pnetid to ib device when no pnetid is set.
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*/
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static bool smc_pnet_apply_ib(struct smc_ib_device *ib_dev, u8 ib_port,
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char *pnet_name)
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{
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bool applied = false;
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mutex_lock(&smc_ib_devices.mutex);
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if (!smc_pnet_is_pnetid_set(ib_dev->pnetid[ib_port - 1])) {
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memcpy(ib_dev->pnetid[ib_port - 1], pnet_name,
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SMC_MAX_PNETID_LEN);
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ib_dev->pnetid_by_user[ib_port - 1] = true;
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applied = true;
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}
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mutex_unlock(&smc_ib_devices.mutex);
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return applied;
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}
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/* Apply pnetid to smcd device when no pnetid is set.
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*/
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static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name)
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{
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bool applied = false;
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mutex_lock(&smcd_dev_list.mutex);
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if (!smc_pnet_is_pnetid_set(smcd_dev->pnetid)) {
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memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN);
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smcd_dev->pnetid_by_user = true;
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applied = true;
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}
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mutex_unlock(&smcd_dev_list.mutex);
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return applied;
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}
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/* The limit for pnetid is 16 characters.
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* Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
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* Lower case letters are converted to upper case.
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* Interior blanks should not be used.
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*/
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static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
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{
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char *bf = skip_spaces(pnet_name);
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size_t len = strlen(bf);
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char *end = bf + len;
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if (!len)
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return false;
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while (--end >= bf && isspace(*end))
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;
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if (end - bf >= SMC_MAX_PNETID_LEN)
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return false;
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while (bf <= end) {
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if (!isalnum(*bf))
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return false;
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*pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
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bf++;
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}
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*pnetid = '\0';
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return true;
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}
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/* Find an infiniband device by a given name. The device might not exist. */
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static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
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{
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struct smc_ib_device *ibdev;
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mutex_lock(&smc_ib_devices.mutex);
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list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
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if (!strncmp(ibdev->ibdev->name, ib_name,
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sizeof(ibdev->ibdev->name)) ||
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(ibdev->ibdev->dev.parent &&
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!strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
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IB_DEVICE_NAME_MAX - 1))) {
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goto out;
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}
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}
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ibdev = NULL;
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out:
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mutex_unlock(&smc_ib_devices.mutex);
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return ibdev;
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}
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/* Find an smcd device by a given name. The device might not exist. */
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static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
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{
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struct smcd_dev *smcd_dev;
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mutex_lock(&smcd_dev_list.mutex);
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list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
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if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
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IB_DEVICE_NAME_MAX - 1))
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goto out;
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}
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smcd_dev = NULL;
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out:
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mutex_unlock(&smcd_dev_list.mutex);
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return smcd_dev;
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}
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static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net,
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char *eth_name, char *pnet_name)
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{
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struct smc_pnetentry *tmp_pe, *new_pe;
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struct net_device *ndev, *base_ndev;
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u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
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bool new_netdev;
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int rc;
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/* check if (base) netdev already has a pnetid. If there is one, we do
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* not want to add a pnet table entry
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*/
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rc = -EEXIST;
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ndev = dev_get_by_name(net, eth_name); /* dev_hold() */
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if (ndev) {
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base_ndev = pnet_find_base_ndev(ndev);
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if (!smc_pnetid_by_dev_port(base_ndev->dev.parent,
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base_ndev->dev_port, ndev_pnetid))
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goto out_put;
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}
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/* add a new netdev entry to the pnet table if there isn't one */
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rc = -ENOMEM;
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new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
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if (!new_pe)
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goto out_put;
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new_pe->type = SMC_PNET_ETH;
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memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
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strncpy(new_pe->eth_name, eth_name, IFNAMSIZ);
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rc = -EEXIST;
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new_netdev = true;
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mutex_lock(&pnettable->lock);
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list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
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if (tmp_pe->type == SMC_PNET_ETH &&
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!strncmp(tmp_pe->eth_name, eth_name, IFNAMSIZ)) {
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new_netdev = false;
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break;
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}
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}
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if (new_netdev) {
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if (ndev) {
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new_pe->ndev = ndev;
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netdev_tracker_alloc(ndev, &new_pe->dev_tracker,
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GFP_ATOMIC);
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}
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list_add_tail(&new_pe->list, &pnettable->pnetlist);
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mutex_unlock(&pnettable->lock);
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} else {
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mutex_unlock(&pnettable->lock);
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kfree(new_pe);
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goto out_put;
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}
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if (ndev)
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pr_warn_ratelimited("smc: net device %s "
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"applied user defined pnetid %.16s\n",
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new_pe->eth_name, new_pe->pnet_name);
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return 0;
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out_put:
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dev_put(ndev);
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return rc;
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}
|
|
|
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static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
|
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u8 ib_port, char *pnet_name)
|
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{
|
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struct smc_pnetentry *tmp_pe, *new_pe;
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struct smc_ib_device *ib_dev;
|
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bool smcddev_applied = true;
|
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bool ibdev_applied = true;
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struct smcd_dev *smcd_dev;
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bool new_ibdev;
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|
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/* try to apply the pnetid to active devices */
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ib_dev = smc_pnet_find_ib(ib_name);
|
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if (ib_dev) {
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ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name);
|
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if (ibdev_applied)
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pr_warn_ratelimited("smc: ib device %s ibport %d "
|
|
"applied user defined pnetid "
|
|
"%.16s\n", ib_dev->ibdev->name,
|
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ib_port,
|
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ib_dev->pnetid[ib_port - 1]);
|
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}
|
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smcd_dev = smc_pnet_find_smcd(ib_name);
|
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if (smcd_dev) {
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smcddev_applied = smc_pnet_apply_smcd(smcd_dev, pnet_name);
|
|
if (smcddev_applied)
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pr_warn_ratelimited("smc: smcd device %s "
|
|
"applied user defined pnetid "
|
|
"%.16s\n", dev_name(&smcd_dev->dev),
|
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smcd_dev->pnetid);
|
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}
|
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/* Apply fails when a device has a hardware-defined pnetid set, do not
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* add a pnet table entry in that case.
|
|
*/
|
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if (!ibdev_applied || !smcddev_applied)
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return -EEXIST;
|
|
|
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/* add a new ib entry to the pnet table if there isn't one */
|
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new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
|
|
if (!new_pe)
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return -ENOMEM;
|
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new_pe->type = SMC_PNET_IB;
|
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memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
|
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strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
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new_pe->ib_port = ib_port;
|
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|
|
new_ibdev = true;
|
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mutex_lock(&pnettable->lock);
|
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list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
|
|
if (tmp_pe->type == SMC_PNET_IB &&
|
|
!strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
|
|
new_ibdev = false;
|
|
break;
|
|
}
|
|
}
|
|
if (new_ibdev) {
|
|
list_add_tail(&new_pe->list, &pnettable->pnetlist);
|
|
mutex_unlock(&pnettable->lock);
|
|
} else {
|
|
mutex_unlock(&pnettable->lock);
|
|
kfree(new_pe);
|
|
}
|
|
return (new_ibdev) ? 0 : -EEXIST;
|
|
}
|
|
|
|
/* Append a pnetid to the end of the pnet table if not already on this list.
|
|
*/
|
|
static int smc_pnet_enter(struct net *net, struct nlattr *tb[])
|
|
{
|
|
char pnet_name[SMC_MAX_PNETID_LEN + 1];
|
|
struct smc_pnettable *pnettable;
|
|
bool new_netdev = false;
|
|
bool new_ibdev = false;
|
|
struct smc_net *sn;
|
|
u8 ibport = 1;
|
|
char *string;
|
|
int rc;
|
|
|
|
/* get pnettable for namespace */
|
|
sn = net_generic(net, smc_net_id);
|
|
pnettable = &sn->pnettable;
|
|
|
|
rc = -EINVAL;
|
|
if (!tb[SMC_PNETID_NAME])
|
|
goto error;
|
|
string = (char *)nla_data(tb[SMC_PNETID_NAME]);
|
|
if (!smc_pnetid_valid(string, pnet_name))
|
|
goto error;
|
|
|
|
if (tb[SMC_PNETID_ETHNAME]) {
|
|
string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
|
|
rc = smc_pnet_add_eth(pnettable, net, string, pnet_name);
|
|
if (!rc)
|
|
new_netdev = true;
|
|
else if (rc != -EEXIST)
|
|
goto error;
|
|
}
|
|
|
|
/* if this is not the initial namespace, stop here */
|
|
if (net != &init_net)
|
|
return new_netdev ? 0 : -EEXIST;
|
|
|
|
rc = -EINVAL;
|
|
if (tb[SMC_PNETID_IBNAME]) {
|
|
string = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
|
|
string = strim(string);
|
|
if (tb[SMC_PNETID_IBPORT]) {
|
|
ibport = nla_get_u8(tb[SMC_PNETID_IBPORT]);
|
|
if (ibport < 1 || ibport > SMC_MAX_PORTS)
|
|
goto error;
|
|
}
|
|
rc = smc_pnet_add_ib(pnettable, string, ibport, pnet_name);
|
|
if (!rc)
|
|
new_ibdev = true;
|
|
else if (rc != -EEXIST)
|
|
goto error;
|
|
}
|
|
return (new_netdev || new_ibdev) ? 0 : -EEXIST;
|
|
|
|
error:
|
|
return rc;
|
|
}
|
|
|
|
/* Convert an smc_pnetentry to a netlink attribute sequence */
|
|
static int smc_pnet_set_nla(struct sk_buff *msg,
|
|
struct smc_pnetentry *pnetelem)
|
|
{
|
|
if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
|
|
return -1;
|
|
if (pnetelem->type == SMC_PNET_ETH) {
|
|
if (nla_put_string(msg, SMC_PNETID_ETHNAME,
|
|
pnetelem->eth_name))
|
|
return -1;
|
|
} else {
|
|
if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
|
|
return -1;
|
|
}
|
|
if (pnetelem->type == SMC_PNET_IB) {
|
|
if (nla_put_string(msg, SMC_PNETID_IBNAME, pnetelem->ib_name) ||
|
|
nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
|
|
return -1;
|
|
} else {
|
|
if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
|
|
nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
|
|
return smc_pnet_enter(net, info->attrs);
|
|
}
|
|
|
|
static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
|
|
if (!info->attrs[SMC_PNETID_NAME])
|
|
return -EINVAL;
|
|
return smc_pnet_remove_by_pnetid(net,
|
|
(char *)nla_data(info->attrs[SMC_PNETID_NAME]));
|
|
}
|
|
|
|
static int smc_pnet_dump_start(struct netlink_callback *cb)
|
|
{
|
|
cb->args[0] = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int smc_pnet_dumpinfo(struct sk_buff *skb,
|
|
u32 portid, u32 seq, u32 flags,
|
|
struct smc_pnetentry *pnetelem)
|
|
{
|
|
void *hdr;
|
|
|
|
hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
|
|
flags, SMC_PNETID_GET);
|
|
if (!hdr)
|
|
return -ENOMEM;
|
|
if (smc_pnet_set_nla(skb, pnetelem) < 0) {
|
|
genlmsg_cancel(skb, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
}
|
|
|
|
static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
|
|
u32 seq, u8 *pnetid, int start_idx)
|
|
{
|
|
struct smc_pnettable *pnettable;
|
|
struct smc_pnetentry *pnetelem;
|
|
struct smc_net *sn;
|
|
int idx = 0;
|
|
|
|
/* get pnettable for namespace */
|
|
sn = net_generic(net, smc_net_id);
|
|
pnettable = &sn->pnettable;
|
|
|
|
/* dump pnettable entries */
|
|
mutex_lock(&pnettable->lock);
|
|
list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
|
|
if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
|
|
continue;
|
|
if (idx++ < start_idx)
|
|
continue;
|
|
/* if this is not the initial namespace, dump only netdev */
|
|
if (net != &init_net && pnetelem->type != SMC_PNET_ETH)
|
|
continue;
|
|
if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
|
|
pnetelem)) {
|
|
--idx;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pnettable->lock);
|
|
return idx;
|
|
}
|
|
|
|
static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int idx;
|
|
|
|
idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NULL, cb->args[0]);
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
/* Retrieve one PNETID entry */
|
|
static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct sk_buff *msg;
|
|
void *hdr;
|
|
|
|
if (!info->attrs[SMC_PNETID_NAME])
|
|
return -EINVAL;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
_smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
|
|
nla_data(info->attrs[SMC_PNETID_NAME]), 0);
|
|
|
|
/* finish multi part message and send it */
|
|
hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
|
|
NLM_F_MULTI);
|
|
if (!hdr) {
|
|
nlmsg_free(msg);
|
|
return -EMSGSIZE;
|
|
}
|
|
return genlmsg_reply(msg, info);
|
|
}
|
|
|
|
/* Remove and delete all pnetids from pnet table.
|
|
*/
|
|
static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
|
|
smc_pnet_remove_by_pnetid(net, NULL);
|
|
return 0;
|
|
}
|
|
|
|
/* SMC_PNETID generic netlink operation definition */
|
|
static const struct genl_ops smc_pnet_ops[] = {
|
|
{
|
|
.cmd = SMC_PNETID_GET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
/* can be retrieved by unprivileged users */
|
|
.doit = smc_pnet_get,
|
|
.dumpit = smc_pnet_dump,
|
|
.start = smc_pnet_dump_start
|
|
},
|
|
{
|
|
.cmd = SMC_PNETID_ADD,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.doit = smc_pnet_add
|
|
},
|
|
{
|
|
.cmd = SMC_PNETID_DEL,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.doit = smc_pnet_del
|
|
},
|
|
{
|
|
.cmd = SMC_PNETID_FLUSH,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.doit = smc_pnet_flush
|
|
}
|
|
};
|
|
|
|
/* SMC_PNETID family definition */
|
|
static struct genl_family smc_pnet_nl_family __ro_after_init = {
|
|
.hdrsize = 0,
|
|
.name = SMCR_GENL_FAMILY_NAME,
|
|
.version = SMCR_GENL_FAMILY_VERSION,
|
|
.maxattr = SMC_PNETID_MAX,
|
|
.policy = smc_pnet_policy,
|
|
.netnsok = true,
|
|
.module = THIS_MODULE,
|
|
.ops = smc_pnet_ops,
|
|
.n_ops = ARRAY_SIZE(smc_pnet_ops)
|
|
};
|
|
|
|
bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid)
|
|
{
|
|
struct smc_net *sn = net_generic(net, smc_net_id);
|
|
struct smc_pnetids_ndev_entry *pe;
|
|
bool rc = false;
|
|
|
|
read_lock(&sn->pnetids_ndev.lock);
|
|
list_for_each_entry(pe, &sn->pnetids_ndev.list, list) {
|
|
if (smc_pnet_match(pnetid, pe->pnetid)) {
|
|
rc = true;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
unlock:
|
|
read_unlock(&sn->pnetids_ndev.lock);
|
|
return rc;
|
|
}
|
|
|
|
static int smc_pnet_add_pnetid(struct net *net, u8 *pnetid)
|
|
{
|
|
struct smc_net *sn = net_generic(net, smc_net_id);
|
|
struct smc_pnetids_ndev_entry *pe, *pi;
|
|
|
|
pe = kzalloc(sizeof(*pe), GFP_KERNEL);
|
|
if (!pe)
|
|
return -ENOMEM;
|
|
|
|
write_lock(&sn->pnetids_ndev.lock);
|
|
list_for_each_entry(pi, &sn->pnetids_ndev.list, list) {
|
|
if (smc_pnet_match(pnetid, pe->pnetid)) {
|
|
refcount_inc(&pi->refcnt);
|
|
kfree(pe);
|
|
goto unlock;
|
|
}
|
|
}
|
|
refcount_set(&pe->refcnt, 1);
|
|
memcpy(pe->pnetid, pnetid, SMC_MAX_PNETID_LEN);
|
|
list_add_tail(&pe->list, &sn->pnetids_ndev.list);
|
|
|
|
unlock:
|
|
write_unlock(&sn->pnetids_ndev.lock);
|
|
return 0;
|
|
}
|
|
|
|
static void smc_pnet_remove_pnetid(struct net *net, u8 *pnetid)
|
|
{
|
|
struct smc_net *sn = net_generic(net, smc_net_id);
|
|
struct smc_pnetids_ndev_entry *pe, *pe2;
|
|
|
|
write_lock(&sn->pnetids_ndev.lock);
|
|
list_for_each_entry_safe(pe, pe2, &sn->pnetids_ndev.list, list) {
|
|
if (smc_pnet_match(pnetid, pe->pnetid)) {
|
|
if (refcount_dec_and_test(&pe->refcnt)) {
|
|
list_del(&pe->list);
|
|
kfree(pe);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
write_unlock(&sn->pnetids_ndev.lock);
|
|
}
|
|
|
|
static void smc_pnet_add_base_pnetid(struct net *net, struct net_device *dev,
|
|
u8 *ndev_pnetid)
|
|
{
|
|
struct net_device *base_dev;
|
|
|
|
base_dev = __pnet_find_base_ndev(dev);
|
|
if (base_dev->flags & IFF_UP &&
|
|
!smc_pnetid_by_dev_port(base_dev->dev.parent, base_dev->dev_port,
|
|
ndev_pnetid)) {
|
|
/* add to PNETIDs list */
|
|
smc_pnet_add_pnetid(net, ndev_pnetid);
|
|
}
|
|
}
|
|
|
|
/* create initial list of netdevice pnetids */
|
|
static void smc_pnet_create_pnetids_list(struct net *net)
|
|
{
|
|
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
|
|
struct net_device *dev;
|
|
|
|
rtnl_lock();
|
|
for_each_netdev(net, dev)
|
|
smc_pnet_add_base_pnetid(net, dev, ndev_pnetid);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/* clean up list of netdevice pnetids */
|
|
static void smc_pnet_destroy_pnetids_list(struct net *net)
|
|
{
|
|
struct smc_net *sn = net_generic(net, smc_net_id);
|
|
struct smc_pnetids_ndev_entry *pe, *temp_pe;
|
|
|
|
write_lock(&sn->pnetids_ndev.lock);
|
|
list_for_each_entry_safe(pe, temp_pe, &sn->pnetids_ndev.list, list) {
|
|
list_del(&pe->list);
|
|
kfree(pe);
|
|
}
|
|
write_unlock(&sn->pnetids_ndev.lock);
|
|
}
|
|
|
|
static int smc_pnet_netdev_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(event_dev);
|
|
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
|
|
|
|
switch (event) {
|
|
case NETDEV_REBOOT:
|
|
case NETDEV_UNREGISTER:
|
|
smc_pnet_remove_by_ndev(event_dev);
|
|
smc_ib_ndev_change(event_dev, event);
|
|
return NOTIFY_OK;
|
|
case NETDEV_REGISTER:
|
|
smc_pnet_add_by_ndev(event_dev);
|
|
smc_ib_ndev_change(event_dev, event);
|
|
return NOTIFY_OK;
|
|
case NETDEV_UP:
|
|
smc_pnet_add_base_pnetid(net, event_dev, ndev_pnetid);
|
|
return NOTIFY_OK;
|
|
case NETDEV_DOWN:
|
|
event_dev = __pnet_find_base_ndev(event_dev);
|
|
if (!smc_pnetid_by_dev_port(event_dev->dev.parent,
|
|
event_dev->dev_port, ndev_pnetid)) {
|
|
/* remove from PNETIDs list */
|
|
smc_pnet_remove_pnetid(net, ndev_pnetid);
|
|
}
|
|
return NOTIFY_OK;
|
|
default:
|
|
return NOTIFY_DONE;
|
|
}
|
|
}
|
|
|
|
static struct notifier_block smc_netdev_notifier = {
|
|
.notifier_call = smc_pnet_netdev_event
|
|
};
|
|
|
|
/* init network namespace */
|
|
int smc_pnet_net_init(struct net *net)
|
|
{
|
|
struct smc_net *sn = net_generic(net, smc_net_id);
|
|
struct smc_pnettable *pnettable = &sn->pnettable;
|
|
struct smc_pnetids_ndev *pnetids_ndev = &sn->pnetids_ndev;
|
|
|
|
INIT_LIST_HEAD(&pnettable->pnetlist);
|
|
mutex_init(&pnettable->lock);
|
|
INIT_LIST_HEAD(&pnetids_ndev->list);
|
|
rwlock_init(&pnetids_ndev->lock);
|
|
|
|
smc_pnet_create_pnetids_list(net);
|
|
|
|
/* disable handshake limitation by default */
|
|
net->smc.limit_smc_hs = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init smc_pnet_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = genl_register_family(&smc_pnet_nl_family);
|
|
if (rc)
|
|
return rc;
|
|
rc = register_netdevice_notifier(&smc_netdev_notifier);
|
|
if (rc)
|
|
genl_unregister_family(&smc_pnet_nl_family);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* exit network namespace */
|
|
void smc_pnet_net_exit(struct net *net)
|
|
{
|
|
/* flush pnet table */
|
|
smc_pnet_remove_by_pnetid(net, NULL);
|
|
smc_pnet_destroy_pnetids_list(net);
|
|
}
|
|
|
|
void smc_pnet_exit(void)
|
|
{
|
|
unregister_netdevice_notifier(&smc_netdev_notifier);
|
|
genl_unregister_family(&smc_pnet_nl_family);
|
|
}
|
|
|
|
static struct net_device *__pnet_find_base_ndev(struct net_device *ndev)
|
|
{
|
|
int i, nest_lvl;
|
|
|
|
ASSERT_RTNL();
|
|
nest_lvl = ndev->lower_level;
|
|
for (i = 0; i < nest_lvl; i++) {
|
|
struct list_head *lower = &ndev->adj_list.lower;
|
|
|
|
if (list_empty(lower))
|
|
break;
|
|
lower = lower->next;
|
|
ndev = netdev_lower_get_next(ndev, &lower);
|
|
}
|
|
return ndev;
|
|
}
|
|
|
|
/* Determine one base device for stacked net devices.
|
|
* If the lower device level contains more than one devices
|
|
* (for instance with bonding slaves), just the first device
|
|
* is used to reach a base device.
|
|
*/
|
|
static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
|
|
{
|
|
rtnl_lock();
|
|
ndev = __pnet_find_base_ndev(ndev);
|
|
rtnl_unlock();
|
|
return ndev;
|
|
}
|
|
|
|
static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
|
|
u8 *pnetid)
|
|
{
|
|
struct smc_pnettable *pnettable;
|
|
struct net *net = dev_net(ndev);
|
|
struct smc_pnetentry *pnetelem;
|
|
struct smc_net *sn;
|
|
int rc = -ENOENT;
|
|
|
|
/* get pnettable for namespace */
|
|
sn = net_generic(net, smc_net_id);
|
|
pnettable = &sn->pnettable;
|
|
|
|
mutex_lock(&pnettable->lock);
|
|
list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
|
|
if (pnetelem->type == SMC_PNET_ETH && ndev == pnetelem->ndev) {
|
|
/* get pnetid of netdev device */
|
|
memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pnettable->lock);
|
|
return rc;
|
|
}
|
|
|
|
static int smc_pnet_determine_gid(struct smc_ib_device *ibdev, int i,
|
|
struct smc_init_info *ini)
|
|
{
|
|
if (!ini->check_smcrv2 &&
|
|
!smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->ib_gid, NULL,
|
|
NULL)) {
|
|
ini->ib_dev = ibdev;
|
|
ini->ib_port = i;
|
|
return 0;
|
|
}
|
|
if (ini->check_smcrv2 &&
|
|
!smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->smcrv2.ib_gid_v2,
|
|
NULL, &ini->smcrv2)) {
|
|
ini->smcrv2.ib_dev_v2 = ibdev;
|
|
ini->smcrv2.ib_port_v2 = i;
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* find a roce device for the given pnetid */
|
|
static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
|
|
struct smc_init_info *ini,
|
|
struct smc_ib_device *known_dev,
|
|
struct net *net)
|
|
{
|
|
struct smc_ib_device *ibdev;
|
|
int i;
|
|
|
|
mutex_lock(&smc_ib_devices.mutex);
|
|
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
|
|
if (ibdev == known_dev ||
|
|
!rdma_dev_access_netns(ibdev->ibdev, net))
|
|
continue;
|
|
for (i = 1; i <= SMC_MAX_PORTS; i++) {
|
|
if (!rdma_is_port_valid(ibdev->ibdev, i))
|
|
continue;
|
|
if (smc_pnet_match(ibdev->pnetid[i - 1], pnet_id) &&
|
|
smc_ib_port_active(ibdev, i) &&
|
|
!test_bit(i - 1, ibdev->ports_going_away)) {
|
|
if (!smc_pnet_determine_gid(ibdev, i, ini))
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&smc_ib_devices.mutex);
|
|
}
|
|
|
|
/* find alternate roce device with same pnet_id, vlan_id and net namespace */
|
|
void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
|
|
struct smc_init_info *ini,
|
|
struct smc_ib_device *known_dev)
|
|
{
|
|
struct net *net = lgr->net;
|
|
|
|
_smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev, net);
|
|
}
|
|
|
|
/* 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_init_info *ini)
|
|
{
|
|
struct net *net = dev_net(netdev);
|
|
struct smc_ib_device *ibdev;
|
|
|
|
mutex_lock(&smc_ib_devices.mutex);
|
|
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
|
|
struct net_device *ndev;
|
|
int i;
|
|
|
|
/* check rdma net namespace */
|
|
if (!rdma_dev_access_netns(ibdev->ibdev, net))
|
|
continue;
|
|
|
|
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) &&
|
|
!test_bit(i - 1, ibdev->ports_going_away)) {
|
|
if (!smc_pnet_determine_gid(ibdev, i, ini))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&smc_ib_devices.mutex);
|
|
}
|
|
|
|
/* 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_init_info *ini)
|
|
{
|
|
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
|
|
struct net *net;
|
|
|
|
ndev = pnet_find_base_ndev(ndev);
|
|
net = dev_net(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_rdma_dev(ndev, ini);
|
|
return; /* pnetid could not be determined */
|
|
}
|
|
_smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL, net);
|
|
}
|
|
|
|
static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
|
|
struct smc_init_info *ini)
|
|
{
|
|
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
|
|
struct smcd_dev *ismdev;
|
|
|
|
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))
|
|
return; /* pnetid could not be determined */
|
|
|
|
mutex_lock(&smcd_dev_list.mutex);
|
|
list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
|
|
if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
|
|
!ismdev->going_away &&
|
|
(!ini->ism_peer_gid[0] ||
|
|
!smc_ism_cantalk(ini->ism_peer_gid[0], ini->vlan_id,
|
|
ismdev))) {
|
|
ini->ism_dev[0] = ismdev;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&smcd_dev_list.mutex);
|
|
}
|
|
|
|
/* PNET table analysis for a given sock:
|
|
* determine ib_device and port belonging to used internal TCP socket
|
|
* ethernet interface.
|
|
*/
|
|
void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
|
|
{
|
|
struct dst_entry *dst = sk_dst_get(sk);
|
|
|
|
if (!dst)
|
|
goto out;
|
|
if (!dst->dev)
|
|
goto out_rel;
|
|
|
|
smc_pnet_find_roce_by_pnetid(dst->dev, ini);
|
|
|
|
out_rel:
|
|
dst_release(dst);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
|
|
{
|
|
struct dst_entry *dst = sk_dst_get(sk);
|
|
|
|
ini->ism_dev[0] = NULL;
|
|
if (!dst)
|
|
goto out;
|
|
if (!dst->dev)
|
|
goto out_rel;
|
|
|
|
smc_pnet_find_ism_by_pnetid(dst->dev, ini);
|
|
|
|
out_rel:
|
|
dst_release(dst);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
/* Lookup and apply a pnet table entry to the given ib device.
|
|
*/
|
|
int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port)
|
|
{
|
|
char *ib_name = smcibdev->ibdev->name;
|
|
struct smc_pnettable *pnettable;
|
|
struct smc_pnetentry *tmp_pe;
|
|
struct smc_net *sn;
|
|
int rc = -ENOENT;
|
|
|
|
/* get pnettable for init namespace */
|
|
sn = net_generic(&init_net, smc_net_id);
|
|
pnettable = &sn->pnettable;
|
|
|
|
mutex_lock(&pnettable->lock);
|
|
list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
|
|
if (tmp_pe->type == SMC_PNET_IB &&
|
|
!strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX) &&
|
|
tmp_pe->ib_port == ib_port) {
|
|
smc_pnet_apply_ib(smcibdev, ib_port, tmp_pe->pnet_name);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pnettable->lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Lookup and apply a pnet table entry to the given smcd device.
|
|
*/
|
|
int smc_pnetid_by_table_smcd(struct smcd_dev *smcddev)
|
|
{
|
|
const char *ib_name = dev_name(&smcddev->dev);
|
|
struct smc_pnettable *pnettable;
|
|
struct smc_pnetentry *tmp_pe;
|
|
struct smc_net *sn;
|
|
int rc = -ENOENT;
|
|
|
|
/* get pnettable for init namespace */
|
|
sn = net_generic(&init_net, smc_net_id);
|
|
pnettable = &sn->pnettable;
|
|
|
|
mutex_lock(&pnettable->lock);
|
|
list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
|
|
if (tmp_pe->type == SMC_PNET_IB &&
|
|
!strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
|
|
smc_pnet_apply_smcd(smcddev, tmp_pe->pnet_name);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pnettable->lock);
|
|
|
|
return rc;
|
|
}
|