diff options
Diffstat (limited to 'net/smc/smc_pnet.c')
| -rw-r--r-- | net/smc/smc_pnet.c | 1174 |
1 files changed, 1174 insertions, 0 deletions
diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c new file mode 100644 index 000000000..30bae60d6 --- /dev/null +++ b/net/smc/smc_pnet.c @@ -0,0 +1,1174 @@ +// 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 <linux/mutex.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" + +static struct net_device *__pnet_find_base_ndev(struct net_device *ndev); +static struct net_device *pnet_find_base_ndev(struct net_device *ndev); + +static const 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; + +enum smc_pnet_nametype { + SMC_PNET_ETH = 1, + SMC_PNET_IB = 2, +}; + +/* pnet entry stored in pnet table */ +struct smc_pnetentry { + struct list_head list; + char pnet_name[SMC_MAX_PNETID_LEN + 1]; + enum smc_pnet_nametype type; + union { + struct { + char eth_name[IFNAMSIZ + 1]; + struct net_device *ndev; + }; + struct { + char ib_name[IB_DEVICE_NAME_MAX + 1]; + u8 ib_port; + }; + }; +}; + +/* Check if the pnetid is set */ +bool smc_pnet_is_pnetid_set(u8 *pnetid) +{ + if (pnetid[0] == 0 || pnetid[0] == _S) + return false; + return true; +} + +/* 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] == _S) && + (pnetid2[i] == 0 || pnetid2[i] == _S)) + 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 table entry */ + mutex_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); + if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev) { + dev_put(pnetelem->ndev); + pr_warn_ratelimited("smc: net device %s " + "erased user defined " + "pnetid %.16s\n", + pnetelem->eth_name, + pnetelem->pnet_name); + } + kfree(pnetelem); + rc = 0; + } + } + mutex_unlock(&pnettable->lock); + + /* if this is not the initial namespace, stop here */ + if (net != &init_net) + return rc; + + /* remove ib devices */ + mutex_lock(&smc_ib_devices.mutex); + 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]))) { + pr_warn_ratelimited("smc: ib device %s ibport " + "%d erased user defined " + "pnetid %.16s\n", + ibdev->ibdev->name, + ibport + 1, + ibdev->pnetid[ibport]); + memset(ibdev->pnetid[ibport], 0, + SMC_MAX_PNETID_LEN); + ibdev->pnetid_by_user[ibport] = false; + rc = 0; + } + } + } + mutex_unlock(&smc_ib_devices.mutex); + /* remove smcd devices */ + mutex_lock(&smcd_dev_list.mutex); + 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))) { + pr_warn_ratelimited("smc: smcd device %s " + "erased user defined pnetid " + "%.16s\n", dev_name(&smcd_dev->dev), + smcd_dev->pnetid); + memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN); + smcd_dev->pnetid_by_user = false; + rc = 0; + } + } + mutex_unlock(&smcd_dev_list.mutex); + return rc; +} + +/* Add the reference to a given network device to the pnet table. + */ +static int smc_pnet_add_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; + + mutex_lock(&pnettable->lock); + list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) { + if (pnetelem->type == SMC_PNET_ETH && !pnetelem->ndev && + !strncmp(pnetelem->eth_name, ndev->name, IFNAMSIZ)) { + dev_hold(ndev); + pnetelem->ndev = ndev; + rc = 0; + pr_warn_ratelimited("smc: adding net device %s with " + "user defined pnetid %.16s\n", + pnetelem->eth_name, + pnetelem->pnet_name); + break; + } + } + mutex_unlock(&pnettable->lock); + return rc; +} + +/* Remove the reference to 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; + + mutex_lock(&pnettable->lock); + list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) { + if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev == ndev) { + dev_put(pnetelem->ndev); + pnetelem->ndev = NULL; + rc = 0; + pr_warn_ratelimited("smc: removing net device %s with " + "user defined pnetid %.16s\n", + pnetelem->eth_name, + pnetelem->pnet_name); + break; + } + } + mutex_unlock(&pnettable->lock); + return rc; +} + +/* Apply pnetid to ib device when no pnetid is set. + */ +static bool smc_pnet_apply_ib(struct smc_ib_device *ib_dev, u8 ib_port, + char *pnet_name) +{ + bool applied = false; + + mutex_lock(&smc_ib_devices.mutex); + if (!smc_pnet_is_pnetid_set(ib_dev->pnetid[ib_port - 1])) { + memcpy(ib_dev->pnetid[ib_port - 1], pnet_name, + SMC_MAX_PNETID_LEN); + ib_dev->pnetid_by_user[ib_port - 1] = true; + applied = true; + } + mutex_unlock(&smc_ib_devices.mutex); + return applied; +} + +/* Apply pnetid to smcd device when no pnetid is set. + */ +static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name) +{ + bool applied = false; + + mutex_lock(&smcd_dev_list.mutex); + if (!smc_pnet_is_pnetid_set(smcd_dev->pnetid)) { + memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN); + smcd_dev->pnetid_by_user = true; + applied = true; + } + mutex_unlock(&smcd_dev_list.mutex); + return applied; +} + +/* 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; + + mutex_lock(&smc_ib_devices.mutex); + list_for_each_entry(ibdev, &smc_ib_devices.list, list) { + if (!strncmp(ibdev->ibdev->name, ib_name, + sizeof(ibdev->ibdev->name)) || + (ibdev->ibdev->dev.parent && + !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name, + IB_DEVICE_NAME_MAX - 1))) { + goto out; + } + } + ibdev = NULL; +out: + mutex_unlock(&smc_ib_devices.mutex); + 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; + + mutex_lock(&smcd_dev_list.mutex); + 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: + mutex_unlock(&smcd_dev_list.mutex); + return smcd_dev; +} + +static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net, + char *eth_name, char *pnet_name) +{ + struct smc_pnetentry *tmp_pe, *new_pe; + struct net_device *ndev, *base_ndev; + u8 ndev_pnetid[SMC_MAX_PNETID_LEN]; + bool new_netdev; + int rc; + + /* check if (base) netdev already has a pnetid. If there is one, we do + * not want to add a pnet table entry + */ + rc = -EEXIST; + ndev = dev_get_by_name(net, eth_name); /* dev_hold() */ + if (ndev) { + base_ndev = pnet_find_base_ndev(ndev); + if (!smc_pnetid_by_dev_port(base_ndev->dev.parent, + base_ndev->dev_port, ndev_pnetid)) + goto out_put; + } + + /* add a new netdev entry to the pnet table if there isn't one */ + rc = -ENOMEM; + new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL); + if (!new_pe) + goto out_put; + new_pe->type = SMC_PNET_ETH; + memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN); + strncpy(new_pe->eth_name, eth_name, IFNAMSIZ); + new_pe->ndev = ndev; + + rc = -EEXIST; + new_netdev = true; + mutex_lock(&pnettable->lock); + list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) { + if (tmp_pe->type == SMC_PNET_ETH && + !strncmp(tmp_pe->eth_name, eth_name, IFNAMSIZ)) { + new_netdev = false; + break; + } + } + if (new_netdev) { + list_add_tail(&new_pe->list, &pnettable->pnetlist); + mutex_unlock(&pnettable->lock); + } else { + mutex_unlock(&pnettable->lock); + kfree(new_pe); + goto out_put; + } + if (ndev) + pr_warn_ratelimited("smc: net device %s " + "applied user defined pnetid %.16s\n", + new_pe->eth_name, new_pe->pnet_name); + return 0; + +out_put: + if (ndev) + dev_put(ndev); + return rc; +} + +static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name, + u8 ib_port, char *pnet_name) +{ + struct smc_pnetentry *tmp_pe, *new_pe; + struct smc_ib_device *ib_dev; + bool smcddev_applied = true; + bool ibdev_applied = true; + struct smcd_dev *smcd_dev; + bool new_ibdev; + + /* try to apply the pnetid to active devices */ + ib_dev = smc_pnet_find_ib(ib_name); + if (ib_dev) { + ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name); + if (ibdev_applied) + pr_warn_ratelimited("smc: ib device %s ibport %d " + "applied user defined pnetid " + "%.16s\n", ib_dev->ibdev->name, + ib_port, + ib_dev->pnetid[ib_port - 1]); + } + smcd_dev = smc_pnet_find_smcd(ib_name); + if (smcd_dev) { + smcddev_applied = smc_pnet_apply_smcd(smcd_dev, pnet_name); + if (smcddev_applied) + pr_warn_ratelimited("smc: smcd device %s " + "applied user defined pnetid " + "%.16s\n", dev_name(&smcd_dev->dev), + smcd_dev->pnetid); + } + /* Apply fails when a device has a hardware-defined pnetid set, do not + * add a pnet table entry in that case. + */ + if (!ibdev_applied || !smcddev_applied) + return -EEXIST; + + /* add a new ib entry to the pnet table if there isn't one */ + new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL); + if (!new_pe) + return -ENOMEM; + new_pe->type = SMC_PNET_IB; + memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN); + strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX); + new_pe->ib_port = ib_port; + + new_ibdev = true; + 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)) { + 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); + return NOTIFY_OK; + case NETDEV_REGISTER: + smc_pnet_add_by_ndev(event_dev); + 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); + + 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; +} + +/* 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 smc_ib_device *ibdev; + int i; + + ini->ib_dev = NULL; + mutex_lock(&smc_ib_devices.mutex); + list_for_each_entry(ibdev, &smc_ib_devices.list, list) { + if (ibdev == known_dev) + 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) && + !smc_ib_determine_gid(ibdev, i, ini->vlan_id, + ini->ib_gid, NULL)) { + ini->ib_dev = ibdev; + ini->ib_port = i; + goto out; + } + } + } +out: + mutex_unlock(&smc_ib_devices.mutex); +} + +/* find alternate roce device with same pnet_id and vlan_id */ +void smc_pnet_find_alt_roce(struct smc_link_group *lgr, + struct smc_init_info *ini, + struct smc_ib_device *known_dev) +{ + _smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev); +} + +/* 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; + + mutex_lock(&smc_ib_devices.mutex); + 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) && + !test_bit(i - 1, ibdev->ports_going_away) && + !smc_ib_determine_gid(ibdev, i, ini->vlan_id, + ini->ib_gid, NULL)) { + ini->ib_dev = ibdev; + ini->ib_port = i; + 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]; + + 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 */ + } + _smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL); +} + +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); + + 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[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; +} |