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kernel-ark/net/smc/smc_pnet.c
Johannes Berg ef6243acb4 genetlink: optionally validate strictly/dumps 
Add options to strictly validate messages and dump messages,
sometimes perhaps validating dump messages non-strictly may
be required, so add an option for that as well.

Since none of this can really be applied to existing commands,
set the options everwhere using the following spatch:

    @@
    identifier ops;
    expression X;
    @@
    struct genl_ops ops[] = {
    ...,
     {
            .cmd = X,
    +       .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
            ...
     },
    ...
    };

For new commands one should just not copy the .validate 'opt-out'
flags and thus get strict validation.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-27 17:07:22 -04:00

897 lines
22 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Generic netlink support functions to configure an SMC-R PNET table
*
* Copyright IBM Corp. 2016
*
* Author(s): Thomas Richter <tmricht@linux.vnet.ibm.com>
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <uapi/linux/if.h>
#include <uapi/linux/smc.h>
#include <rdma/ib_verbs.h>
#include <net/netns/generic.h>
#include "smc_netns.h"
#include "smc_pnet.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_core.h"
#define SMC_ASCII_BLANK 32
static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
static struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
[SMC_PNETID_NAME] = {
.type = NLA_NUL_STRING,
.len = SMC_MAX_PNETID_LEN
},
[SMC_PNETID_ETHNAME] = {
.type = NLA_NUL_STRING,
.len = IFNAMSIZ - 1
},
[SMC_PNETID_IBNAME] = {
.type = NLA_NUL_STRING,
.len = IB_DEVICE_NAME_MAX - 1
},
[SMC_PNETID_IBPORT] = { .type = NLA_U8 }
};
static struct genl_family smc_pnet_nl_family;
/**
* struct smc_user_pnetentry - pnet identifier name entry for/from user
* @list: List node.
* @pnet_name: Pnet identifier name
* @ndev: pointer to network device.
* @smcibdev: Pointer to IB device.
* @ib_port: Port of IB device.
* @smcd_dev: Pointer to smcd device.
*/
struct smc_user_pnetentry {
struct list_head list;
char pnet_name[SMC_MAX_PNETID_LEN + 1];
struct net_device *ndev;
struct smc_ib_device *smcibdev;
u8 ib_port;
struct smcd_dev *smcd_dev;
};
/* pnet entry stored in pnet table */
struct smc_pnetentry {
struct list_head list;
char pnet_name[SMC_MAX_PNETID_LEN + 1];
struct net_device *ndev;
};
/* Check if two given pnetids match */
static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
{
int i;
for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
if ((pnetid1[i] == 0 || pnetid1[i] == SMC_ASCII_BLANK) &&
(pnetid2[i] == 0 || pnetid2[i] == SMC_ASCII_BLANK))
break;
if (pnetid1[i] != pnetid2[i])
return false;
}
return true;
}
/* Remove a pnetid from the pnet table.
*/
static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
{
struct smc_pnetentry *pnetelem, *tmp_pe;
struct smc_pnettable *pnettable;
struct smc_ib_device *ibdev;
struct smcd_dev *smcd_dev;
struct smc_net *sn;
int rc = -ENOENT;
int ibport;
/* get pnettable for namespace */
sn = net_generic(net, smc_net_id);
pnettable = &sn->pnettable;
/* remove netdevices */
write_lock(&pnettable->lock);
list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
list) {
if (!pnet_name ||
smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
list_del(&pnetelem->list);
dev_put(pnetelem->ndev);
kfree(pnetelem);
rc = 0;
}
}
write_unlock(&pnettable->lock);
/* if this is not the initial namespace, stop here */
if (net != &init_net)
return rc;
/* remove ib devices */
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
if (ibdev->pnetid_by_user[ibport] &&
(!pnet_name ||
smc_pnet_match(pnet_name,
ibdev->pnetid[ibport]))) {
memset(ibdev->pnetid[ibport], 0,
SMC_MAX_PNETID_LEN);
ibdev->pnetid_by_user[ibport] = false;
rc = 0;
}
}
}
spin_unlock(&smc_ib_devices.lock);
/* remove smcd devices */
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
if (smcd_dev->pnetid_by_user &&
(!pnet_name ||
smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
smcd_dev->pnetid_by_user = false;
rc = 0;
}
}
spin_unlock(&smcd_dev_list.lock);
return rc;
}
/* Remove a pnet entry mentioning a given network device from the pnet table.
*/
static int smc_pnet_remove_by_ndev(struct net_device *ndev)
{
struct smc_pnetentry *pnetelem, *tmp_pe;
struct smc_pnettable *pnettable;
struct net *net = dev_net(ndev);
struct smc_net *sn;
int rc = -ENOENT;
/* get pnettable for namespace */
sn = net_generic(net, smc_net_id);
pnettable = &sn->pnettable;
write_lock(&pnettable->lock);
list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
if (pnetelem->ndev == ndev) {
list_del(&pnetelem->list);
dev_put(pnetelem->ndev);
kfree(pnetelem);
rc = 0;
break;
}
}
write_unlock(&pnettable->lock);
return rc;
}
/* Append a pnetid to the end of the pnet table if not already on this list.
*/
static int smc_pnet_enter(struct smc_pnettable *pnettable,
struct smc_user_pnetentry *new_pnetelem)
{
u8 pnet_null[SMC_MAX_PNETID_LEN] = {0};
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
struct smc_pnetentry *tmp_pnetelem;
struct smc_pnetentry *pnetelem;
bool new_smcddev = false;
struct net_device *ndev;
bool new_netdev = true;
bool new_ibdev = false;
if (new_pnetelem->smcibdev) {
struct smc_ib_device *ib_dev = new_pnetelem->smcibdev;
int ib_port = new_pnetelem->ib_port;
spin_lock(&smc_ib_devices.lock);
if (smc_pnet_match(ib_dev->pnetid[ib_port - 1], pnet_null)) {
memcpy(ib_dev->pnetid[ib_port - 1],
new_pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
ib_dev->pnetid_by_user[ib_port - 1] = true;
new_ibdev = true;
}
spin_unlock(&smc_ib_devices.lock);
}
if (new_pnetelem->smcd_dev) {
struct smcd_dev *smcd_dev = new_pnetelem->smcd_dev;
spin_lock(&smcd_dev_list.lock);
if (smc_pnet_match(smcd_dev->pnetid, pnet_null)) {
memcpy(smcd_dev->pnetid, new_pnetelem->pnet_name,
SMC_MAX_PNETID_LEN);
smcd_dev->pnetid_by_user = true;
new_smcddev = true;
}
spin_unlock(&smcd_dev_list.lock);
}
if (!new_pnetelem->ndev)
return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
/* check if (base) netdev already has a pnetid. If there is one, we do
* not want to add a pnet table entry
*/
ndev = pnet_find_base_ndev(new_pnetelem->ndev);
if (!smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
ndev_pnetid))
return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
/* add a new netdev entry to the pnet table if there isn't one */
tmp_pnetelem = kzalloc(sizeof(*pnetelem), GFP_KERNEL);
if (!tmp_pnetelem)
return -ENOMEM;
memcpy(tmp_pnetelem->pnet_name, new_pnetelem->pnet_name,
SMC_MAX_PNETID_LEN);
tmp_pnetelem->ndev = new_pnetelem->ndev;
write_lock(&pnettable->lock);
list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
if (pnetelem->ndev == new_pnetelem->ndev)
new_netdev = false;
}
if (new_netdev) {
dev_hold(tmp_pnetelem->ndev);
list_add_tail(&tmp_pnetelem->list, &pnettable->pnetlist);
write_unlock(&pnettable->lock);
} else {
write_unlock(&pnettable->lock);
kfree(tmp_pnetelem);
}
return (new_netdev || new_ibdev || new_smcddev) ? 0 : -EEXIST;
}
/* The limit for pnetid is 16 characters.
* Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
* Lower case letters are converted to upper case.
* Interior blanks should not be used.
*/
static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
{
char *bf = skip_spaces(pnet_name);
size_t len = strlen(bf);
char *end = bf + len;
if (!len)
return false;
while (--end >= bf && isspace(*end))
;
if (end - bf >= SMC_MAX_PNETID_LEN)
return false;
while (bf <= end) {
if (!isalnum(*bf))
return false;
*pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
bf++;
}
*pnetid = '\0';
return true;
}
/* Find an infiniband device by a given name. The device might not exist. */
static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
{
struct smc_ib_device *ibdev;
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
if (!strncmp(ibdev->ibdev->name, ib_name,
sizeof(ibdev->ibdev->name)) ||
!strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
IB_DEVICE_NAME_MAX - 1)) {
goto out;
}
}
ibdev = NULL;
out:
spin_unlock(&smc_ib_devices.lock);
return ibdev;
}
/* Find an smcd device by a given name. The device might not exist. */
static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
{
struct smcd_dev *smcd_dev;
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
IB_DEVICE_NAME_MAX - 1))
goto out;
}
smcd_dev = NULL;
out:
spin_unlock(&smcd_dev_list.lock);
return smcd_dev;
}
/* Parse the supplied netlink attributes and fill a pnetentry structure.
* For ethernet and infiniband device names verify that the devices exist.
*/
static int smc_pnet_fill_entry(struct net *net,
struct smc_user_pnetentry *pnetelem,
struct nlattr *tb[])
{
char *string, *ibname;
int rc;
memset(pnetelem, 0, sizeof(*pnetelem));
INIT_LIST_HEAD(&pnetelem->list);
rc = -EINVAL;
if (!tb[SMC_PNETID_NAME])
goto error;
string = (char *)nla_data(tb[SMC_PNETID_NAME]);
if (!smc_pnetid_valid(string, pnetelem->pnet_name))
goto error;
rc = -EINVAL;
if (tb[SMC_PNETID_ETHNAME]) {
string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
pnetelem->ndev = dev_get_by_name(net, string);
if (!pnetelem->ndev)
goto error;
}
/* if this is not the initial namespace, stop here */
if (net != &init_net)
return 0;
rc = -EINVAL;
if (tb[SMC_PNETID_IBNAME]) {
ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
ibname = strim(ibname);
pnetelem->smcibdev = smc_pnet_find_ib(ibname);
pnetelem->smcd_dev = smc_pnet_find_smcd(ibname);
if (!pnetelem->smcibdev && !pnetelem->smcd_dev)
goto error;
if (pnetelem->smcibdev) {
if (!tb[SMC_PNETID_IBPORT])
goto error;
pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
if (pnetelem->ib_port < 1 ||
pnetelem->ib_port > SMC_MAX_PORTS)
goto error;
}
}
return 0;
error:
if (pnetelem->ndev)
dev_put(pnetelem->ndev);
return rc;
}
/* Convert an smc_pnetentry to a netlink attribute sequence */
static int smc_pnet_set_nla(struct sk_buff *msg,
struct smc_user_pnetentry *pnetelem)
{
if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
return -1;
if (pnetelem->ndev) {
if (nla_put_string(msg, SMC_PNETID_ETHNAME,
pnetelem->ndev->name))
return -1;
} else {
if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
return -1;
}
if (pnetelem->smcibdev) {
if (nla_put_string(msg, SMC_PNETID_IBNAME,
dev_name(pnetelem->smcibdev->ibdev->dev.parent)) ||
nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
return -1;
} else if (pnetelem->smcd_dev) {
if (nla_put_string(msg, SMC_PNETID_IBNAME,
dev_name(&pnetelem->smcd_dev->dev)) ||
nla_put_u8(msg, SMC_PNETID_IBPORT, 1))
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);
struct smc_user_pnetentry pnetelem;
struct smc_pnettable *pnettable;
struct smc_net *sn;
int rc;
/* get pnettable for namespace */
sn = net_generic(net, smc_net_id);
pnettable = &sn->pnettable;
rc = smc_pnet_fill_entry(net, &pnetelem, info->attrs);
if (!rc)
rc = smc_pnet_enter(pnettable, &pnetelem);
if (pnetelem.ndev)
dev_put(pnetelem.ndev);
return rc;
}
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_user_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_user_pnetentry tmp_entry;
struct smc_pnettable *pnettable;
struct smc_pnetentry *pnetelem;
struct smc_ib_device *ibdev;
struct smcd_dev *smcd_dev;
struct smc_net *sn;
int idx = 0;
int ibport;
/* get pnettable for namespace */
sn = net_generic(net, smc_net_id);
pnettable = &sn->pnettable;
/* dump netdevices */
read_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;
memset(&tmp_entry, 0, sizeof(tmp_entry));
memcpy(&tmp_entry.pnet_name, pnetelem->pnet_name,
SMC_MAX_PNETID_LEN);
tmp_entry.ndev = pnetelem->ndev;
if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
&tmp_entry)) {
--idx;
break;
}
}
read_unlock(&pnettable->lock);
/* if this is not the initial namespace, stop here */
if (net != &init_net)
return idx;
/* dump ib devices */
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
if (ibdev->pnetid_by_user[ibport]) {
if (pnetid &&
!smc_pnet_match(ibdev->pnetid[ibport],
pnetid))
continue;
if (idx++ < start_idx)
continue;
memset(&tmp_entry, 0, sizeof(tmp_entry));
memcpy(&tmp_entry.pnet_name,
ibdev->pnetid[ibport],
SMC_MAX_PNETID_LEN);
tmp_entry.smcibdev = ibdev;
tmp_entry.ib_port = ibport + 1;
if (smc_pnet_dumpinfo(skb, portid, seq,
NLM_F_MULTI,
&tmp_entry)) {
--idx;
break;
}
}
}
}
spin_unlock(&smc_ib_devices.lock);
/* dump smcd devices */
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
if (smcd_dev->pnetid_by_user) {
if (pnetid && !smc_pnet_match(smcd_dev->pnetid, pnetid))
continue;
if (idx++ < start_idx)
continue;
memset(&tmp_entry, 0, sizeof(tmp_entry));
memcpy(&tmp_entry.pnet_name, smcd_dev->pnetid,
SMC_MAX_PNETID_LEN);
tmp_entry.smcd_dev = smcd_dev;
if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
&tmp_entry)) {
--idx;
break;
}
}
}
spin_unlock(&smcd_dev_list.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,
.flags = GENL_ADMIN_PERM,
.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)
};
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);
switch (event) {
case NETDEV_REBOOT:
case NETDEV_UNREGISTER:
smc_pnet_remove_by_ndev(event_dev);
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;
INIT_LIST_HEAD(&pnettable->pnetlist);
rwlock_init(&pnettable->lock);
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);
}
void smc_pnet_exit(void)
{
unregister_netdevice_notifier(&smc_netdev_notifier);
genl_unregister_family(&smc_pnet_nl_family);
}
/* 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)
{
int i, nest_lvl;
rtnl_lock();
nest_lvl = dev_get_nest_level(ndev);
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);
}
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;
read_lock(&pnettable->lock);
list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
if (ndev == pnetelem->ndev) {
/* get pnetid of netdev device */
memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
rc = 0;
break;
}
}
read_unlock(&pnettable->lock);
return rc;
}
/* if handshake network device belongs to a roce device, return its
* IB device and port
*/
static void smc_pnet_find_rdma_dev(struct net_device *netdev,
struct smc_init_info *ini)
{
struct smc_ib_device *ibdev;
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
struct net_device *ndev;
int i;
for (i = 1; i <= SMC_MAX_PORTS; i++) {
if (!rdma_is_port_valid(ibdev->ibdev, i))
continue;
if (!ibdev->ibdev->ops.get_netdev)
continue;
ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
if (!ndev)
continue;
dev_put(ndev);
if (netdev == ndev &&
smc_ib_port_active(ibdev, i) &&
!smc_ib_determine_gid(ibdev, i, ini->vlan_id,
ini->ib_gid, NULL)) {
ini->ib_dev = ibdev;
ini->ib_port = i;
break;
}
}
}
spin_unlock(&smc_ib_devices.lock);
}
/* Determine the corresponding IB device port based on the hardware PNETID.
* Searching stops at the first matching active IB device port with vlan_id
* configured.
* If nothing found, check pnetid table.
* If nothing found, try to use handshake device
*/
static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
struct smc_init_info *ini)
{
u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
struct smc_ib_device *ibdev;
int i;
ndev = pnet_find_base_ndev(ndev);
if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
ndev_pnetid) &&
smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
smc_pnet_find_rdma_dev(ndev, ini);
return; /* pnetid could not be determined */
}
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
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], ndev_pnetid) &&
smc_ib_port_active(ibdev, i) &&
!smc_ib_determine_gid(ibdev, i, ini->vlan_id,
ini->ib_gid, NULL)) {
ini->ib_dev = ibdev;
ini->ib_port = i;
goto out;
}
}
}
out:
spin_unlock(&smc_ib_devices.lock);
}
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 */
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
ini->ism_dev = ismdev;
break;
}
}
spin_unlock(&smcd_dev_list.lock);
}
/* 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);
ini->ib_dev = NULL;
ini->ib_port = 0;
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 = 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;
}
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