555 lines
14 KiB
C
555 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Shared Memory Communications Direct over ISM devices (SMC-D)
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*
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* Functions for ISM device.
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*
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* Copyright IBM Corp. 2018
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*/
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#include <linux/if_vlan.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <asm/page.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_ism.h"
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#include "smc_pnet.h"
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#include "smc_netlink.h"
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#include "linux/ism.h"
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struct smcd_dev_list smcd_dev_list = {
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.list = LIST_HEAD_INIT(smcd_dev_list.list),
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.mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
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};
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static bool smc_ism_v2_capable;
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static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
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#if IS_ENABLED(CONFIG_ISM)
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static void smcd_register_dev(struct ism_dev *ism);
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static void smcd_unregister_dev(struct ism_dev *ism);
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static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event);
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static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
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u16 dmbemask);
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static struct ism_client smc_ism_client = {
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.name = "SMC-D",
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.add = smcd_register_dev,
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.remove = smcd_unregister_dev,
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.handle_event = smcd_handle_event,
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.handle_irq = smcd_handle_irq,
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};
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#endif
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/* Test if an ISM communication is possible - same CPC */
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int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
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{
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return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
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vlan_id);
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}
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void smc_ism_get_system_eid(u8 **eid)
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{
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if (!smc_ism_v2_capable)
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*eid = NULL;
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else
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*eid = smc_ism_v2_system_eid;
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}
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u16 smc_ism_get_chid(struct smcd_dev *smcd)
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{
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return smcd->ops->get_chid(smcd);
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}
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/* HW supports ISM V2 and thus System EID is defined */
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bool smc_ism_is_v2_capable(void)
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{
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return smc_ism_v2_capable;
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}
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/* Set a connection using this DMBE. */
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void smc_ism_set_conn(struct smc_connection *conn)
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{
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unsigned long flags;
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spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
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conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
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spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
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}
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/* Unset a connection using this DMBE. */
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void smc_ism_unset_conn(struct smc_connection *conn)
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{
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unsigned long flags;
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if (!conn->rmb_desc)
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return;
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spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
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conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
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spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
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}
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/* Register a VLAN identifier with the ISM device. Use a reference count
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* and add a VLAN identifier only when the first DMB using this VLAN is
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* registered.
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*/
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int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
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{
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struct smc_ism_vlanid *new_vlan, *vlan;
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unsigned long flags;
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int rc = 0;
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if (!vlanid) /* No valid vlan id */
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return -EINVAL;
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/* create new vlan entry, in case we need it */
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new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
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if (!new_vlan)
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return -ENOMEM;
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new_vlan->vlanid = vlanid;
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refcount_set(&new_vlan->refcnt, 1);
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/* if there is an existing entry, increase count and return */
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spin_lock_irqsave(&smcd->lock, flags);
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list_for_each_entry(vlan, &smcd->vlan, list) {
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if (vlan->vlanid == vlanid) {
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refcount_inc(&vlan->refcnt);
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kfree(new_vlan);
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goto out;
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}
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}
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/* no existing entry found.
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* add new entry to device; might fail, e.g., if HW limit reached
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*/
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if (smcd->ops->add_vlan_id(smcd, vlanid)) {
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kfree(new_vlan);
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rc = -EIO;
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goto out;
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}
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list_add_tail(&new_vlan->list, &smcd->vlan);
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out:
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spin_unlock_irqrestore(&smcd->lock, flags);
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return rc;
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}
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/* Unregister a VLAN identifier with the ISM device. Use a reference count
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* and remove a VLAN identifier only when the last DMB using this VLAN is
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* unregistered.
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*/
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int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
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{
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struct smc_ism_vlanid *vlan;
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unsigned long flags;
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bool found = false;
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int rc = 0;
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if (!vlanid) /* No valid vlan id */
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return -EINVAL;
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spin_lock_irqsave(&smcd->lock, flags);
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list_for_each_entry(vlan, &smcd->vlan, list) {
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if (vlan->vlanid == vlanid) {
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if (!refcount_dec_and_test(&vlan->refcnt))
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goto out;
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found = true;
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break;
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}
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}
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if (!found) {
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rc = -ENOENT;
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goto out; /* VLAN id not in table */
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}
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/* Found and the last reference just gone */
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if (smcd->ops->del_vlan_id(smcd, vlanid))
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rc = -EIO;
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list_del(&vlan->list);
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kfree(vlan);
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out:
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spin_unlock_irqrestore(&smcd->lock, flags);
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return rc;
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}
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int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
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{
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struct smcd_dmb dmb;
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int rc = 0;
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if (!dmb_desc->dma_addr)
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return rc;
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memset(&dmb, 0, sizeof(dmb));
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dmb.dmb_tok = dmb_desc->token;
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dmb.sba_idx = dmb_desc->sba_idx;
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dmb.cpu_addr = dmb_desc->cpu_addr;
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dmb.dma_addr = dmb_desc->dma_addr;
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dmb.dmb_len = dmb_desc->len;
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rc = smcd->ops->unregister_dmb(smcd, &dmb);
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if (!rc || rc == ISM_ERROR) {
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dmb_desc->cpu_addr = NULL;
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dmb_desc->dma_addr = 0;
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}
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return rc;
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}
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int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
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struct smc_buf_desc *dmb_desc)
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{
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#if IS_ENABLED(CONFIG_ISM)
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struct smcd_dmb dmb;
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int rc;
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memset(&dmb, 0, sizeof(dmb));
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dmb.dmb_len = dmb_len;
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dmb.sba_idx = dmb_desc->sba_idx;
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dmb.vlan_id = lgr->vlan_id;
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dmb.rgid = lgr->peer_gid;
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rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb, &smc_ism_client);
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if (!rc) {
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dmb_desc->sba_idx = dmb.sba_idx;
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dmb_desc->token = dmb.dmb_tok;
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dmb_desc->cpu_addr = dmb.cpu_addr;
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dmb_desc->dma_addr = dmb.dma_addr;
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dmb_desc->len = dmb.dmb_len;
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}
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return rc;
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#else
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return 0;
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#endif
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}
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static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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char smc_pnet[SMC_MAX_PNETID_LEN + 1];
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struct smc_pci_dev smc_pci_dev;
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struct nlattr *port_attrs;
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struct nlattr *attrs;
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struct ism_dev *ism;
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int use_cnt = 0;
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void *nlh;
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ism = smcd->priv;
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nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
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&smc_gen_nl_family, NLM_F_MULTI,
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SMC_NETLINK_GET_DEV_SMCD);
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if (!nlh)
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goto errmsg;
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attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD);
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if (!attrs)
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goto errout;
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use_cnt = atomic_read(&smcd->lgr_cnt);
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if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt))
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
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goto errattr;
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memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
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smc_set_pci_values(to_pci_dev(ism->dev.parent), &smc_pci_dev);
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if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
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goto errattr;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
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goto errattr;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor))
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goto errattr;
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if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device))
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goto errattr;
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if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id))
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goto errattr;
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port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT);
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if (!port_attrs)
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user))
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goto errportattr;
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memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
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smc_pnet[SMC_MAX_PNETID_LEN] = 0;
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if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
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goto errportattr;
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nla_nest_end(skb, port_attrs);
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nla_nest_end(skb, attrs);
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genlmsg_end(skb, nlh);
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return 0;
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errportattr:
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nla_nest_cancel(skb, port_attrs);
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errattr:
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nla_nest_cancel(skb, attrs);
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errout:
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nlmsg_cancel(skb, nlh);
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errmsg:
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return -EMSGSIZE;
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}
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static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
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int snum = cb_ctx->pos[0];
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struct smcd_dev *smcd;
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int num = 0;
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mutex_lock(&dev_list->mutex);
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list_for_each_entry(smcd, &dev_list->list, list) {
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if (num < snum)
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goto next;
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if (smc_nl_handle_smcd_dev(smcd, skb, cb))
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goto errout;
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next:
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num++;
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}
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errout:
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mutex_unlock(&dev_list->mutex);
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cb_ctx->pos[0] = num;
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}
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int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
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{
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smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb);
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return skb->len;
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}
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#if IS_ENABLED(CONFIG_ISM)
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struct smc_ism_event_work {
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struct work_struct work;
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struct smcd_dev *smcd;
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struct ism_event event;
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};
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#define ISM_EVENT_REQUEST 0x0001
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#define ISM_EVENT_RESPONSE 0x0002
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#define ISM_EVENT_REQUEST_IR 0x00000001
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#define ISM_EVENT_CODE_SHUTDOWN 0x80
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#define ISM_EVENT_CODE_TESTLINK 0x83
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union smcd_sw_event_info {
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u64 info;
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struct {
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u8 uid[SMC_LGR_ID_SIZE];
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unsigned short vlan_id;
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u16 code;
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};
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};
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static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
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{
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union smcd_sw_event_info ev_info;
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ev_info.info = wrk->event.info;
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switch (wrk->event.code) {
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case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */
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smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
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break;
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case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
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if (ev_info.code == ISM_EVENT_REQUEST) {
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ev_info.code = ISM_EVENT_RESPONSE;
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wrk->smcd->ops->signal_event(wrk->smcd,
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wrk->event.tok,
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ISM_EVENT_REQUEST_IR,
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ISM_EVENT_CODE_TESTLINK,
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ev_info.info);
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}
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break;
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}
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}
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/* worker for SMC-D events */
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static void smc_ism_event_work(struct work_struct *work)
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{
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struct smc_ism_event_work *wrk =
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container_of(work, struct smc_ism_event_work, work);
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switch (wrk->event.type) {
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case ISM_EVENT_GID: /* GID event, token is peer GID */
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smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
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break;
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case ISM_EVENT_DMB:
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break;
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case ISM_EVENT_SWR: /* Software defined event */
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smcd_handle_sw_event(wrk);
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break;
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}
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kfree(wrk);
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}
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static struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
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const struct smcd_ops *ops, int max_dmbs)
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{
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struct smcd_dev *smcd;
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smcd = devm_kzalloc(parent, sizeof(*smcd), GFP_KERNEL);
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if (!smcd)
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return NULL;
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smcd->conn = devm_kcalloc(parent, max_dmbs,
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sizeof(struct smc_connection *), GFP_KERNEL);
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if (!smcd->conn)
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return NULL;
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smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
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WQ_MEM_RECLAIM, name);
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if (!smcd->event_wq)
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return NULL;
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smcd->ops = ops;
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spin_lock_init(&smcd->lock);
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spin_lock_init(&smcd->lgr_lock);
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INIT_LIST_HEAD(&smcd->vlan);
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INIT_LIST_HEAD(&smcd->lgr_list);
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init_waitqueue_head(&smcd->lgrs_deleted);
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return smcd;
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}
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static void smcd_register_dev(struct ism_dev *ism)
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{
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const struct smcd_ops *ops = ism_get_smcd_ops();
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struct smcd_dev *smcd;
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if (!ops)
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return;
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smcd = smcd_alloc_dev(&ism->pdev->dev, dev_name(&ism->pdev->dev), ops,
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ISM_NR_DMBS);
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if (!smcd)
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return;
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smcd->priv = ism;
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ism_set_priv(ism, &smc_ism_client, smcd);
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if (smc_pnetid_by_dev_port(&ism->pdev->dev, 0, smcd->pnetid))
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smc_pnetid_by_table_smcd(smcd);
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mutex_lock(&smcd_dev_list.mutex);
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if (list_empty(&smcd_dev_list.list)) {
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u8 *system_eid = NULL;
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system_eid = smcd->ops->get_system_eid();
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if (smcd->ops->supports_v2()) {
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smc_ism_v2_capable = true;
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memcpy(smc_ism_v2_system_eid, system_eid,
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SMC_MAX_EID_LEN);
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}
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}
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/* sort list: devices without pnetid before devices with pnetid */
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if (smcd->pnetid[0])
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list_add_tail(&smcd->list, &smcd_dev_list.list);
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else
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list_add(&smcd->list, &smcd_dev_list.list);
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mutex_unlock(&smcd_dev_list.mutex);
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pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
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dev_name(&ism->dev), smcd->pnetid,
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smcd->pnetid_by_user ? " (user defined)" : "");
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return;
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}
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static void smcd_unregister_dev(struct ism_dev *ism)
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{
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struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
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pr_warn_ratelimited("smc: removing smcd device %s\n",
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dev_name(&ism->dev));
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smcd->going_away = 1;
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smc_smcd_terminate_all(smcd);
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mutex_lock(&smcd_dev_list.mutex);
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list_del_init(&smcd->list);
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mutex_unlock(&smcd_dev_list.mutex);
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destroy_workqueue(smcd->event_wq);
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}
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/* SMCD Device event handler. Called from ISM device interrupt handler.
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* Parameters are ism device pointer,
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* - event->type (0 --> DMB, 1 --> GID),
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* - event->code (event code),
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* - event->tok (either DMB token when event type 0, or GID when event type 1)
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* - event->time (time of day)
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* - event->info (debug info).
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*
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* Context:
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* - Function called in IRQ context from ISM device driver event handler.
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|
*/
|
|
static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event)
|
|
{
|
|
struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
|
|
struct smc_ism_event_work *wrk;
|
|
|
|
if (smcd->going_away)
|
|
return;
|
|
/* copy event to event work queue, and let it be handled there */
|
|
wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
|
|
if (!wrk)
|
|
return;
|
|
INIT_WORK(&wrk->work, smc_ism_event_work);
|
|
wrk->smcd = smcd;
|
|
wrk->event = *event;
|
|
queue_work(smcd->event_wq, &wrk->work);
|
|
}
|
|
|
|
/* SMCD Device interrupt handler. Called from ISM device interrupt handler.
|
|
* Parameters are the ism device pointer, DMB number, and the DMBE bitmask.
|
|
* Find the connection and schedule the tasklet for this connection.
|
|
*
|
|
* Context:
|
|
* - Function called in IRQ context from ISM device driver IRQ handler.
|
|
*/
|
|
static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
|
|
u16 dmbemask)
|
|
{
|
|
struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
|
|
struct smc_connection *conn = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&smcd->lock, flags);
|
|
conn = smcd->conn[dmbno];
|
|
if (conn && !conn->killed)
|
|
tasklet_schedule(&conn->rx_tsklet);
|
|
spin_unlock_irqrestore(&smcd->lock, flags);
|
|
}
|
|
#endif
|
|
|
|
int smc_ism_signal_shutdown(struct smc_link_group *lgr)
|
|
{
|
|
int rc = 0;
|
|
#if IS_ENABLED(CONFIG_ISM)
|
|
union smcd_sw_event_info ev_info;
|
|
|
|
if (lgr->peer_shutdown)
|
|
return 0;
|
|
|
|
memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
|
|
ev_info.vlan_id = lgr->vlan_id;
|
|
ev_info.code = ISM_EVENT_REQUEST;
|
|
rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
|
|
ISM_EVENT_REQUEST_IR,
|
|
ISM_EVENT_CODE_SHUTDOWN,
|
|
ev_info.info);
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
int smc_ism_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
#if IS_ENABLED(CONFIG_ISM)
|
|
smc_ism_v2_capable = false;
|
|
memset(smc_ism_v2_system_eid, 0, SMC_MAX_EID_LEN);
|
|
|
|
rc = ism_register_client(&smc_ism_client);
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
void smc_ism_exit(void)
|
|
{
|
|
#if IS_ENABLED(CONFIG_ISM)
|
|
ism_unregister_client(&smc_ism_client);
|
|
#endif
|
|
}
|