2017-01-09 16:55:15 +01:00
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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 <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 "smc_pnet.h"
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#include "smc_ib.h"
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#define SMC_MAX_PNET_ID_LEN 16 /* Max. length of PNET id */
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static 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_PNET_ID_LEN - 1
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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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/**
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* struct smc_pnettable - SMC PNET table anchor
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* @lock: Lock for list action
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* @pnetlist: List of PNETIDs
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*/
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static struct smc_pnettable {
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rwlock_t lock;
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struct list_head pnetlist;
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} smc_pnettable = {
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.pnetlist = LIST_HEAD_INIT(smc_pnettable.pnetlist),
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.lock = __RW_LOCK_UNLOCKED(smc_pnettable.lock)
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};
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/**
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* struct smc_pnetentry - pnet identifier name entry
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* @list: List node.
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* @pnet_name: Pnet identifier name
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* @ndev: pointer to network device.
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* @smcibdev: Pointer to IB device.
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*/
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struct smc_pnetentry {
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struct list_head list;
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char pnet_name[SMC_MAX_PNET_ID_LEN + 1];
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struct net_device *ndev;
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struct smc_ib_device *smcibdev;
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u8 ib_port;
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};
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/* Check if two RDMA device entries are identical. Use device name and port
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* number for comparison.
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*/
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static bool smc_pnet_same_ibname(struct smc_pnetentry *pnetelem, char *ibname,
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u8 ibport)
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{
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return pnetelem->ib_port == ibport &&
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!strncmp(pnetelem->smcibdev->ibdev->name, ibname,
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sizeof(pnetelem->smcibdev->ibdev->name));
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}
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/* Find a pnetid in the pnet table.
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*/
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static struct smc_pnetentry *smc_pnet_find_pnetid(char *pnet_name)
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{
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struct smc_pnetentry *pnetelem, *found_pnetelem = NULL;
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read_lock(&smc_pnettable.lock);
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list_for_each_entry(pnetelem, &smc_pnettable.pnetlist, list) {
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if (!strncmp(pnetelem->pnet_name, pnet_name,
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sizeof(pnetelem->pnet_name))) {
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found_pnetelem = pnetelem;
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break;
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}
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}
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read_unlock(&smc_pnettable.lock);
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return found_pnetelem;
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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(char *pnet_name)
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{
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struct smc_pnetentry *pnetelem, *tmp_pe;
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int rc = -ENOENT;
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write_lock(&smc_pnettable.lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &smc_pnettable.pnetlist,
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list) {
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if (!strncmp(pnetelem->pnet_name, pnet_name,
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sizeof(pnetelem->pnet_name))) {
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list_del(&pnetelem->list);
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dev_put(pnetelem->ndev);
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kfree(pnetelem);
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rc = 0;
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break;
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}
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}
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write_unlock(&smc_pnettable.lock);
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return rc;
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}
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/* Remove a pnet entry mentioning 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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int rc = -ENOENT;
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write_lock(&smc_pnettable.lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &smc_pnettable.pnetlist,
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list) {
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if (pnetelem->ndev == ndev) {
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list_del(&pnetelem->list);
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dev_put(pnetelem->ndev);
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kfree(pnetelem);
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rc = 0;
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break;
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}
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}
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write_unlock(&smc_pnettable.lock);
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return rc;
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}
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/* Remove a pnet entry mentioning a given ib device from the pnet table.
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*/
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int smc_pnet_remove_by_ibdev(struct smc_ib_device *ibdev)
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{
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struct smc_pnetentry *pnetelem, *tmp_pe;
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int rc = -ENOENT;
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write_lock(&smc_pnettable.lock);
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list_for_each_entry_safe(pnetelem, tmp_pe, &smc_pnettable.pnetlist,
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list) {
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if (pnetelem->smcibdev == ibdev) {
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list_del(&pnetelem->list);
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dev_put(pnetelem->ndev);
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kfree(pnetelem);
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rc = 0;
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break;
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}
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}
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write_unlock(&smc_pnettable.lock);
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return rc;
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}
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/* Append a pnetid to the end of the pnet table if not already on this list.
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*/
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static int smc_pnet_enter(struct smc_pnetentry *new_pnetelem)
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{
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struct smc_pnetentry *pnetelem;
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int rc = -EEXIST;
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write_lock(&smc_pnettable.lock);
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list_for_each_entry(pnetelem, &smc_pnettable.pnetlist, list) {
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if (!strncmp(pnetelem->pnet_name, new_pnetelem->pnet_name,
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sizeof(new_pnetelem->pnet_name)) ||
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!strncmp(pnetelem->ndev->name, new_pnetelem->ndev->name,
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sizeof(new_pnetelem->ndev->name)) ||
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smc_pnet_same_ibname(pnetelem,
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new_pnetelem->smcibdev->ibdev->name,
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2017-09-21 09:16:29 +02:00
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new_pnetelem->ib_port)) {
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dev_put(pnetelem->ndev);
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2017-01-09 16:55:15 +01:00
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goto found;
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2017-09-21 09:16:29 +02:00
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}
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2017-01-09 16:55:15 +01:00
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}
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list_add_tail(&new_pnetelem->list, &smc_pnettable.pnetlist);
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rc = 0;
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found:
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write_unlock(&smc_pnettable.lock);
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return rc;
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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_PNET_ID_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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2017-04-10 14:57:57 +02:00
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static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
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2017-01-09 16:55:15 +01:00
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{
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struct smc_ib_device *ibdev;
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spin_lock(&smc_ib_devices.lock);
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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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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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spin_unlock(&smc_ib_devices.lock);
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return ibdev;
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}
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/* Parse the supplied netlink attributes and fill a pnetentry structure.
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* For ethernet and infiniband device names verify that the devices exist.
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*/
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static int smc_pnet_fill_entry(struct net *net, struct smc_pnetentry *pnetelem,
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struct nlattr *tb[])
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{
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char *string, *ibname = NULL;
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int rc = 0;
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memset(pnetelem, 0, sizeof(*pnetelem));
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INIT_LIST_HEAD(&pnetelem->list);
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if (tb[SMC_PNETID_NAME]) {
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string = (char *)nla_data(tb[SMC_PNETID_NAME]);
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if (!smc_pnetid_valid(string, pnetelem->pnet_name)) {
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rc = -EINVAL;
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goto error;
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}
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}
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if (tb[SMC_PNETID_ETHNAME]) {
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string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
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pnetelem->ndev = dev_get_by_name(net, string);
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if (!pnetelem->ndev)
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return -ENOENT;
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}
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if (tb[SMC_PNETID_IBNAME]) {
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ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
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ibname = strim(ibname);
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pnetelem->smcibdev = smc_pnet_find_ib(ibname);
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if (!pnetelem->smcibdev) {
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rc = -ENOENT;
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goto error;
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}
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}
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if (tb[SMC_PNETID_IBPORT]) {
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pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
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if (pnetelem->ib_port > SMC_MAX_PORTS) {
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rc = -EINVAL;
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goto error;
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}
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}
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return 0;
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error:
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if (pnetelem->ndev)
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dev_put(pnetelem->ndev);
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return rc;
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}
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/* Convert an smc_pnetentry to a netlink attribute sequence */
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static int smc_pnet_set_nla(struct sk_buff *msg, struct smc_pnetentry *pnetelem)
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{
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if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name) ||
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nla_put_string(msg, SMC_PNETID_ETHNAME, pnetelem->ndev->name) ||
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nla_put_string(msg, SMC_PNETID_IBNAME,
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pnetelem->smcibdev->ibdev->name) ||
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nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
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return -1;
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return 0;
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}
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/* Retrieve one PNETID entry */
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static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
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{
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struct smc_pnetentry *pnetelem;
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struct sk_buff *msg;
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void *hdr;
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int rc;
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pnetelem = smc_pnet_find_pnetid(
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(char *)nla_data(info->attrs[SMC_PNETID_NAME]));
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if (!pnetelem)
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return -ENOENT;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
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&smc_pnet_nl_family, 0, SMC_PNETID_GET);
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if (!hdr) {
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rc = -EMSGSIZE;
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goto err_out;
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}
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if (smc_pnet_set_nla(msg, pnetelem)) {
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rc = -ENOBUFS;
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goto err_out;
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}
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genlmsg_end(msg, hdr);
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return genlmsg_reply(msg, info);
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err_out:
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nlmsg_free(msg);
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return rc;
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}
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static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct smc_pnetentry *pnetelem;
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int rc;
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pnetelem = kzalloc(sizeof(*pnetelem), GFP_KERNEL);
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if (!pnetelem)
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return -ENOMEM;
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rc = smc_pnet_fill_entry(net, pnetelem, info->attrs);
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if (!rc)
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rc = smc_pnet_enter(pnetelem);
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if (rc) {
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kfree(pnetelem);
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return rc;
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}
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rc = smc_ib_remember_port_attr(pnetelem->smcibdev, pnetelem->ib_port);
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if (rc)
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smc_pnet_remove_by_pnetid(pnetelem->pnet_name);
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|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
|
|
|
|
{
|
|
|
|
return smc_pnet_remove_by_pnetid(
|
|
|
|
(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 sk_buff *skb, struct netlink_callback *cb)
|
|
|
|
{
|
|
|
|
struct smc_pnetentry *pnetelem;
|
|
|
|
int idx = 0;
|
|
|
|
|
|
|
|
read_lock(&smc_pnettable.lock);
|
|
|
|
list_for_each_entry(pnetelem, &smc_pnettable.pnetlist, list) {
|
|
|
|
if (idx++ < cb->args[0])
|
|
|
|
continue;
|
|
|
|
if (smc_pnet_dumpinfo(skb, NETLINK_CB(cb->skb).portid,
|
|
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
|
|
pnetelem)) {
|
|
|
|
--idx;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
cb->args[0] = idx;
|
|
|
|
read_unlock(&smc_pnettable.lock);
|
|
|
|
return skb->len;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Remove and delete all pnetids from pnet table.
|
|
|
|
*/
|
|
|
|
static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
|
|
|
|
{
|
|
|
|
struct smc_pnetentry *pnetelem, *tmp_pe;
|
|
|
|
|
|
|
|
write_lock(&smc_pnettable.lock);
|
|
|
|
list_for_each_entry_safe(pnetelem, tmp_pe, &smc_pnettable.pnetlist,
|
|
|
|
list) {
|
|
|
|
list_del(&pnetelem->list);
|
|
|
|
dev_put(pnetelem->ndev);
|
|
|
|
kfree(pnetelem);
|
|
|
|
}
|
|
|
|
write_unlock(&smc_pnettable.lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* SMC_PNETID generic netlink operation definition */
|
|
|
|
static const struct genl_ops smc_pnet_ops[] = {
|
|
|
|
{
|
|
|
|
.cmd = SMC_PNETID_GET,
|
|
|
|
.flags = GENL_ADMIN_PERM,
|
|
|
|
.policy = smc_pnet_policy,
|
|
|
|
.doit = smc_pnet_get,
|
|
|
|
.dumpit = smc_pnet_dump,
|
|
|
|
.start = smc_pnet_dump_start
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.cmd = SMC_PNETID_ADD,
|
|
|
|
.flags = GENL_ADMIN_PERM,
|
|
|
|
.policy = smc_pnet_policy,
|
|
|
|
.doit = smc_pnet_add
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.cmd = SMC_PNETID_DEL,
|
|
|
|
.flags = GENL_ADMIN_PERM,
|
|
|
|
.policy = smc_pnet_policy,
|
|
|
|
.doit = smc_pnet_del
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.cmd = SMC_PNETID_FLUSH,
|
|
|
|
.flags = GENL_ADMIN_PERM,
|
|
|
|
.policy = smc_pnet_policy,
|
|
|
|
.doit = smc_pnet_flush
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* SMC_PNETID family definition */
|
|
|
|
static struct genl_family smc_pnet_nl_family = {
|
|
|
|
.hdrsize = 0,
|
|
|
|
.name = SMCR_GENL_FAMILY_NAME,
|
|
|
|
.version = SMCR_GENL_FAMILY_VERSION,
|
|
|
|
.maxattr = SMC_PNETID_MAX,
|
|
|
|
.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);
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block smc_netdev_notifier = {
|
|
|
|
.notifier_call = smc_pnet_netdev_event
|
|
|
|
};
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
void smc_pnet_exit(void)
|
|
|
|
{
|
|
|
|
smc_pnet_flush(NULL, NULL);
|
|
|
|
unregister_netdevice_notifier(&smc_netdev_notifier);
|
|
|
|
genl_unregister_family(&smc_pnet_nl_family);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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_ib_device **smcibdev, u8 *ibport)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst = sk_dst_get(sk);
|
|
|
|
struct smc_pnetentry *pnetelem;
|
|
|
|
|
|
|
|
*smcibdev = NULL;
|
|
|
|
*ibport = 0;
|
|
|
|
|
|
|
|
if (!dst)
|
|
|
|
return;
|
|
|
|
if (!dst->dev)
|
|
|
|
goto out_rel;
|
|
|
|
read_lock(&smc_pnettable.lock);
|
|
|
|
list_for_each_entry(pnetelem, &smc_pnettable.pnetlist, list) {
|
|
|
|
if (dst->dev == pnetelem->ndev) {
|
2017-04-10 14:57:58 +02:00
|
|
|
if (smc_ib_port_active(pnetelem->smcibdev,
|
|
|
|
pnetelem->ib_port)) {
|
|
|
|
*smcibdev = pnetelem->smcibdev;
|
|
|
|
*ibport = pnetelem->ib_port;
|
|
|
|
}
|
2017-01-09 16:55:15 +01:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
read_unlock(&smc_pnettable.lock);
|
|
|
|
out_rel:
|
|
|
|
dst_release(dst);
|
|
|
|
}
|