| // 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: |
| 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); |
| 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); |
| |
| 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; |
| } |