1c6ba7c9bSHans Wippel // SPDX-License-Identifier: GPL-2.0
2c6ba7c9bSHans Wippel /* Shared Memory Communications Direct over ISM devices (SMC-D)
3c6ba7c9bSHans Wippel *
4c6ba7c9bSHans Wippel * Functions for ISM device.
5c6ba7c9bSHans Wippel *
6c6ba7c9bSHans Wippel * Copyright IBM Corp. 2018
7c6ba7c9bSHans Wippel */
8c6ba7c9bSHans Wippel
9b6459415SJakub Kicinski #include <linux/if_vlan.h>
10c6ba7c9bSHans Wippel #include <linux/spinlock.h>
1182087c03SUrsula Braun #include <linux/mutex.h>
12c6ba7c9bSHans Wippel #include <linux/slab.h>
13c6ba7c9bSHans Wippel #include <asm/page.h>
14c6ba7c9bSHans Wippel
15c6ba7c9bSHans Wippel #include "smc.h"
16c6ba7c9bSHans Wippel #include "smc_core.h"
17c6ba7c9bSHans Wippel #include "smc_ism.h"
181619f770SHans Wippel #include "smc_pnet.h"
19aaf95523SGuvenc Gulce #include "smc_netlink.h"
208747716fSStefan Raspl #include "linux/ism.h"
21c6ba7c9bSHans Wippel
22c6ba7c9bSHans Wippel struct smcd_dev_list smcd_dev_list = {
23c6ba7c9bSHans Wippel .list = LIST_HEAD_INIT(smcd_dev_list.list),
2482087c03SUrsula Braun .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
25c6ba7c9bSHans Wippel };
26c6ba7c9bSHans Wippel
2749407ae2SGuvenc Gulce static bool smc_ism_v2_capable;
2811a26c59SKarsten Graul static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
29201091ebSUrsula Braun
30820f2100SStefan Raspl #if IS_ENABLED(CONFIG_ISM)
318747716fSStefan Raspl static void smcd_register_dev(struct ism_dev *ism);
328747716fSStefan Raspl static void smcd_unregister_dev(struct ism_dev *ism);
338747716fSStefan Raspl static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event);
348747716fSStefan Raspl static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
358747716fSStefan Raspl u16 dmbemask);
368747716fSStefan Raspl
378747716fSStefan Raspl static struct ism_client smc_ism_client = {
388747716fSStefan Raspl .name = "SMC-D",
398747716fSStefan Raspl .add = smcd_register_dev,
408747716fSStefan Raspl .remove = smcd_unregister_dev,
418747716fSStefan Raspl .handle_event = smcd_handle_event,
428747716fSStefan Raspl .handle_irq = smcd_handle_irq,
438747716fSStefan Raspl };
44820f2100SStefan Raspl #endif
458747716fSStefan Raspl
46201091ebSUrsula Braun /* Test if an ISM communication is possible - same CPC */
smc_ism_cantalk(u64 peer_gid,unsigned short vlan_id,struct smcd_dev * smcd)47c6ba7c9bSHans Wippel int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
48c6ba7c9bSHans Wippel {
49c6ba7c9bSHans Wippel return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
50c6ba7c9bSHans Wippel vlan_id);
51c6ba7c9bSHans Wippel }
52c6ba7c9bSHans Wippel
smc_ism_get_system_eid(u8 ** eid)5311a26c59SKarsten Graul void smc_ism_get_system_eid(u8 **eid)
54201091ebSUrsula Braun {
5511a26c59SKarsten Graul if (!smc_ism_v2_capable)
5611a26c59SKarsten Graul *eid = NULL;
5711a26c59SKarsten Graul else
5811a26c59SKarsten Graul *eid = smc_ism_v2_system_eid;
59201091ebSUrsula Braun }
60201091ebSUrsula Braun
smc_ism_get_chid(struct smcd_dev * smcd)618caaccf5SUrsula Braun u16 smc_ism_get_chid(struct smcd_dev *smcd)
628caaccf5SUrsula Braun {
638caaccf5SUrsula Braun return smcd->ops->get_chid(smcd);
648caaccf5SUrsula Braun }
658caaccf5SUrsula Braun
6649407ae2SGuvenc Gulce /* HW supports ISM V2 and thus System EID is defined */
smc_ism_is_v2_capable(void)6749407ae2SGuvenc Gulce bool smc_ism_is_v2_capable(void)
6849407ae2SGuvenc Gulce {
6949407ae2SGuvenc Gulce return smc_ism_v2_capable;
7049407ae2SGuvenc Gulce }
7149407ae2SGuvenc Gulce
72c6ba7c9bSHans Wippel /* Set a connection using this DMBE. */
smc_ism_set_conn(struct smc_connection * conn)73c6ba7c9bSHans Wippel void smc_ism_set_conn(struct smc_connection *conn)
74c6ba7c9bSHans Wippel {
75c6ba7c9bSHans Wippel unsigned long flags;
76c6ba7c9bSHans Wippel
77c6ba7c9bSHans Wippel spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
78c6ba7c9bSHans Wippel conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
79c6ba7c9bSHans Wippel spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
80c6ba7c9bSHans Wippel }
81c6ba7c9bSHans Wippel
82c6ba7c9bSHans Wippel /* Unset a connection using this DMBE. */
smc_ism_unset_conn(struct smc_connection * conn)83c6ba7c9bSHans Wippel void smc_ism_unset_conn(struct smc_connection *conn)
84c6ba7c9bSHans Wippel {
85c6ba7c9bSHans Wippel unsigned long flags;
86c6ba7c9bSHans Wippel
87c6ba7c9bSHans Wippel if (!conn->rmb_desc)
88c6ba7c9bSHans Wippel return;
89c6ba7c9bSHans Wippel
90c6ba7c9bSHans Wippel spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
91c6ba7c9bSHans Wippel conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
92c6ba7c9bSHans Wippel spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
93c6ba7c9bSHans Wippel }
94c6ba7c9bSHans Wippel
95c6ba7c9bSHans Wippel /* Register a VLAN identifier with the ISM device. Use a reference count
96c6ba7c9bSHans Wippel * and add a VLAN identifier only when the first DMB using this VLAN is
97c6ba7c9bSHans Wippel * registered.
98c6ba7c9bSHans Wippel */
smc_ism_get_vlan(struct smcd_dev * smcd,unsigned short vlanid)99c6ba7c9bSHans Wippel int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
100c6ba7c9bSHans Wippel {
101c6ba7c9bSHans Wippel struct smc_ism_vlanid *new_vlan, *vlan;
102c6ba7c9bSHans Wippel unsigned long flags;
103c6ba7c9bSHans Wippel int rc = 0;
104c6ba7c9bSHans Wippel
105c6ba7c9bSHans Wippel if (!vlanid) /* No valid vlan id */
106c6ba7c9bSHans Wippel return -EINVAL;
107c6ba7c9bSHans Wippel
108c6ba7c9bSHans Wippel /* create new vlan entry, in case we need it */
109c6ba7c9bSHans Wippel new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
110c6ba7c9bSHans Wippel if (!new_vlan)
111c6ba7c9bSHans Wippel return -ENOMEM;
112c6ba7c9bSHans Wippel new_vlan->vlanid = vlanid;
113c6ba7c9bSHans Wippel refcount_set(&new_vlan->refcnt, 1);
114c6ba7c9bSHans Wippel
115c6ba7c9bSHans Wippel /* if there is an existing entry, increase count and return */
116c6ba7c9bSHans Wippel spin_lock_irqsave(&smcd->lock, flags);
117c6ba7c9bSHans Wippel list_for_each_entry(vlan, &smcd->vlan, list) {
118c6ba7c9bSHans Wippel if (vlan->vlanid == vlanid) {
119c6ba7c9bSHans Wippel refcount_inc(&vlan->refcnt);
120c6ba7c9bSHans Wippel kfree(new_vlan);
121c6ba7c9bSHans Wippel goto out;
122c6ba7c9bSHans Wippel }
123c6ba7c9bSHans Wippel }
124c6ba7c9bSHans Wippel
125c6ba7c9bSHans Wippel /* no existing entry found.
126c6ba7c9bSHans Wippel * add new entry to device; might fail, e.g., if HW limit reached
127c6ba7c9bSHans Wippel */
128c6ba7c9bSHans Wippel if (smcd->ops->add_vlan_id(smcd, vlanid)) {
129c6ba7c9bSHans Wippel kfree(new_vlan);
130c6ba7c9bSHans Wippel rc = -EIO;
131c6ba7c9bSHans Wippel goto out;
132c6ba7c9bSHans Wippel }
133c6ba7c9bSHans Wippel list_add_tail(&new_vlan->list, &smcd->vlan);
134c6ba7c9bSHans Wippel out:
135c6ba7c9bSHans Wippel spin_unlock_irqrestore(&smcd->lock, flags);
136c6ba7c9bSHans Wippel return rc;
137c6ba7c9bSHans Wippel }
138c6ba7c9bSHans Wippel
139c6ba7c9bSHans Wippel /* Unregister a VLAN identifier with the ISM device. Use a reference count
140c6ba7c9bSHans Wippel * and remove a VLAN identifier only when the last DMB using this VLAN is
141c6ba7c9bSHans Wippel * unregistered.
142c6ba7c9bSHans Wippel */
smc_ism_put_vlan(struct smcd_dev * smcd,unsigned short vlanid)143c6ba7c9bSHans Wippel int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
144c6ba7c9bSHans Wippel {
145c6ba7c9bSHans Wippel struct smc_ism_vlanid *vlan;
146c6ba7c9bSHans Wippel unsigned long flags;
147c6ba7c9bSHans Wippel bool found = false;
148c6ba7c9bSHans Wippel int rc = 0;
149c6ba7c9bSHans Wippel
150c6ba7c9bSHans Wippel if (!vlanid) /* No valid vlan id */
151c6ba7c9bSHans Wippel return -EINVAL;
152c6ba7c9bSHans Wippel
153c6ba7c9bSHans Wippel spin_lock_irqsave(&smcd->lock, flags);
154c6ba7c9bSHans Wippel list_for_each_entry(vlan, &smcd->vlan, list) {
155c6ba7c9bSHans Wippel if (vlan->vlanid == vlanid) {
156c6ba7c9bSHans Wippel if (!refcount_dec_and_test(&vlan->refcnt))
157c6ba7c9bSHans Wippel goto out;
158c6ba7c9bSHans Wippel found = true;
159c6ba7c9bSHans Wippel break;
160c6ba7c9bSHans Wippel }
161c6ba7c9bSHans Wippel }
162c6ba7c9bSHans Wippel if (!found) {
163c6ba7c9bSHans Wippel rc = -ENOENT;
164c6ba7c9bSHans Wippel goto out; /* VLAN id not in table */
165c6ba7c9bSHans Wippel }
166c6ba7c9bSHans Wippel
167c6ba7c9bSHans Wippel /* Found and the last reference just gone */
168c6ba7c9bSHans Wippel if (smcd->ops->del_vlan_id(smcd, vlanid))
169c6ba7c9bSHans Wippel rc = -EIO;
170c6ba7c9bSHans Wippel list_del(&vlan->list);
171c6ba7c9bSHans Wippel kfree(vlan);
172c6ba7c9bSHans Wippel out:
173c6ba7c9bSHans Wippel spin_unlock_irqrestore(&smcd->lock, flags);
174c6ba7c9bSHans Wippel return rc;
175c6ba7c9bSHans Wippel }
176c6ba7c9bSHans Wippel
smc_ism_unregister_dmb(struct smcd_dev * smcd,struct smc_buf_desc * dmb_desc)177c6ba7c9bSHans Wippel int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
178c6ba7c9bSHans Wippel {
179c6ba7c9bSHans Wippel struct smcd_dmb dmb;
18042bfba9eSUrsula Braun int rc = 0;
18142bfba9eSUrsula Braun
18242bfba9eSUrsula Braun if (!dmb_desc->dma_addr)
18342bfba9eSUrsula Braun return rc;
184c6ba7c9bSHans Wippel
185c6ba7c9bSHans Wippel memset(&dmb, 0, sizeof(dmb));
186c6ba7c9bSHans Wippel dmb.dmb_tok = dmb_desc->token;
187c6ba7c9bSHans Wippel dmb.sba_idx = dmb_desc->sba_idx;
188c6ba7c9bSHans Wippel dmb.cpu_addr = dmb_desc->cpu_addr;
189c6ba7c9bSHans Wippel dmb.dma_addr = dmb_desc->dma_addr;
190c6ba7c9bSHans Wippel dmb.dmb_len = dmb_desc->len;
19142bfba9eSUrsula Braun rc = smcd->ops->unregister_dmb(smcd, &dmb);
19242bfba9eSUrsula Braun if (!rc || rc == ISM_ERROR) {
19342bfba9eSUrsula Braun dmb_desc->cpu_addr = NULL;
19442bfba9eSUrsula Braun dmb_desc->dma_addr = 0;
19542bfba9eSUrsula Braun }
19642bfba9eSUrsula Braun
19742bfba9eSUrsula Braun return rc;
198c6ba7c9bSHans Wippel }
199c6ba7c9bSHans Wippel
smc_ism_register_dmb(struct smc_link_group * lgr,int dmb_len,struct smc_buf_desc * dmb_desc)200c6ba7c9bSHans Wippel int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
201c6ba7c9bSHans Wippel struct smc_buf_desc *dmb_desc)
202c6ba7c9bSHans Wippel {
203820f2100SStefan Raspl #if IS_ENABLED(CONFIG_ISM)
204c6ba7c9bSHans Wippel struct smcd_dmb dmb;
205c6ba7c9bSHans Wippel int rc;
206c6ba7c9bSHans Wippel
207c6ba7c9bSHans Wippel memset(&dmb, 0, sizeof(dmb));
208c6ba7c9bSHans Wippel dmb.dmb_len = dmb_len;
209c6ba7c9bSHans Wippel dmb.sba_idx = dmb_desc->sba_idx;
210c6ba7c9bSHans Wippel dmb.vlan_id = lgr->vlan_id;
211c6ba7c9bSHans Wippel dmb.rgid = lgr->peer_gid;
212820f2100SStefan Raspl rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb, &smc_ism_client);
213c6ba7c9bSHans Wippel if (!rc) {
214c6ba7c9bSHans Wippel dmb_desc->sba_idx = dmb.sba_idx;
215c6ba7c9bSHans Wippel dmb_desc->token = dmb.dmb_tok;
216c6ba7c9bSHans Wippel dmb_desc->cpu_addr = dmb.cpu_addr;
217c6ba7c9bSHans Wippel dmb_desc->dma_addr = dmb.dma_addr;
218c6ba7c9bSHans Wippel dmb_desc->len = dmb.dmb_len;
219c6ba7c9bSHans Wippel }
220c6ba7c9bSHans Wippel return rc;
221820f2100SStefan Raspl #else
222820f2100SStefan Raspl return 0;
223820f2100SStefan Raspl #endif
224c6ba7c9bSHans Wippel }
225c6ba7c9bSHans Wippel
smc_nl_handle_smcd_dev(struct smcd_dev * smcd,struct sk_buff * skb,struct netlink_callback * cb)226aaf95523SGuvenc Gulce static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
227aaf95523SGuvenc Gulce struct sk_buff *skb,
228aaf95523SGuvenc Gulce struct netlink_callback *cb)
229aaf95523SGuvenc Gulce {
230aaf95523SGuvenc Gulce char smc_pnet[SMC_MAX_PNETID_LEN + 1];
231aaf95523SGuvenc Gulce struct smc_pci_dev smc_pci_dev;
232aaf95523SGuvenc Gulce struct nlattr *port_attrs;
233aaf95523SGuvenc Gulce struct nlattr *attrs;
2348c81ba20SStefan Raspl struct ism_dev *ism;
235aaf95523SGuvenc Gulce int use_cnt = 0;
236aaf95523SGuvenc Gulce void *nlh;
237aaf95523SGuvenc Gulce
2388c81ba20SStefan Raspl ism = smcd->priv;
239aaf95523SGuvenc Gulce nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
240aaf95523SGuvenc Gulce &smc_gen_nl_family, NLM_F_MULTI,
241aaf95523SGuvenc Gulce SMC_NETLINK_GET_DEV_SMCD);
242aaf95523SGuvenc Gulce if (!nlh)
243aaf95523SGuvenc Gulce goto errmsg;
244aaf95523SGuvenc Gulce attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD);
245aaf95523SGuvenc Gulce if (!attrs)
246aaf95523SGuvenc Gulce goto errout;
247aaf95523SGuvenc Gulce use_cnt = atomic_read(&smcd->lgr_cnt);
248aaf95523SGuvenc Gulce if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt))
249aaf95523SGuvenc Gulce goto errattr;
250aaf95523SGuvenc Gulce if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
251aaf95523SGuvenc Gulce goto errattr;
252aaf95523SGuvenc Gulce memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
2538c81ba20SStefan Raspl smc_set_pci_values(to_pci_dev(ism->dev.parent), &smc_pci_dev);
254aaf95523SGuvenc Gulce if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
255aaf95523SGuvenc Gulce goto errattr;
256aaf95523SGuvenc Gulce if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
257aaf95523SGuvenc Gulce goto errattr;
258aaf95523SGuvenc Gulce if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor))
259aaf95523SGuvenc Gulce goto errattr;
260aaf95523SGuvenc Gulce if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device))
261aaf95523SGuvenc Gulce goto errattr;
262aaf95523SGuvenc Gulce if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id))
263aaf95523SGuvenc Gulce goto errattr;
264aaf95523SGuvenc Gulce
265aaf95523SGuvenc Gulce port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT);
266aaf95523SGuvenc Gulce if (!port_attrs)
267aaf95523SGuvenc Gulce goto errattr;
268aaf95523SGuvenc Gulce if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user))
269aaf95523SGuvenc Gulce goto errportattr;
2708a446536SGuvenc Gulce memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
2718a446536SGuvenc Gulce smc_pnet[SMC_MAX_PNETID_LEN] = 0;
272aaf95523SGuvenc Gulce if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
273aaf95523SGuvenc Gulce goto errportattr;
274aaf95523SGuvenc Gulce
275aaf95523SGuvenc Gulce nla_nest_end(skb, port_attrs);
276aaf95523SGuvenc Gulce nla_nest_end(skb, attrs);
277aaf95523SGuvenc Gulce genlmsg_end(skb, nlh);
278aaf95523SGuvenc Gulce return 0;
279aaf95523SGuvenc Gulce
280aaf95523SGuvenc Gulce errportattr:
281aaf95523SGuvenc Gulce nla_nest_cancel(skb, port_attrs);
282aaf95523SGuvenc Gulce errattr:
283aaf95523SGuvenc Gulce nla_nest_cancel(skb, attrs);
284aaf95523SGuvenc Gulce errout:
285aaf95523SGuvenc Gulce nlmsg_cancel(skb, nlh);
286aaf95523SGuvenc Gulce errmsg:
287aaf95523SGuvenc Gulce return -EMSGSIZE;
288aaf95523SGuvenc Gulce }
289aaf95523SGuvenc Gulce
smc_nl_prep_smcd_dev(struct smcd_dev_list * dev_list,struct sk_buff * skb,struct netlink_callback * cb)290aaf95523SGuvenc Gulce static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
291aaf95523SGuvenc Gulce struct sk_buff *skb,
292aaf95523SGuvenc Gulce struct netlink_callback *cb)
293aaf95523SGuvenc Gulce {
294aaf95523SGuvenc Gulce struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
295aaf95523SGuvenc Gulce int snum = cb_ctx->pos[0];
296aaf95523SGuvenc Gulce struct smcd_dev *smcd;
297aaf95523SGuvenc Gulce int num = 0;
298aaf95523SGuvenc Gulce
299aaf95523SGuvenc Gulce mutex_lock(&dev_list->mutex);
300aaf95523SGuvenc Gulce list_for_each_entry(smcd, &dev_list->list, list) {
301aaf95523SGuvenc Gulce if (num < snum)
302aaf95523SGuvenc Gulce goto next;
303aaf95523SGuvenc Gulce if (smc_nl_handle_smcd_dev(smcd, skb, cb))
304aaf95523SGuvenc Gulce goto errout;
305aaf95523SGuvenc Gulce next:
306aaf95523SGuvenc Gulce num++;
307aaf95523SGuvenc Gulce }
308aaf95523SGuvenc Gulce errout:
309aaf95523SGuvenc Gulce mutex_unlock(&dev_list->mutex);
310aaf95523SGuvenc Gulce cb_ctx->pos[0] = num;
311aaf95523SGuvenc Gulce }
312aaf95523SGuvenc Gulce
smcd_nl_get_device(struct sk_buff * skb,struct netlink_callback * cb)313aaf95523SGuvenc Gulce int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
314aaf95523SGuvenc Gulce {
315aaf95523SGuvenc Gulce smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb);
316aaf95523SGuvenc Gulce return skb->len;
317aaf95523SGuvenc Gulce }
318aaf95523SGuvenc Gulce
319820f2100SStefan Raspl #if IS_ENABLED(CONFIG_ISM)
320c6ba7c9bSHans Wippel struct smc_ism_event_work {
321c6ba7c9bSHans Wippel struct work_struct work;
322c6ba7c9bSHans Wippel struct smcd_dev *smcd;
32389e7d2baSStefan Raspl struct ism_event event;
324c6ba7c9bSHans Wippel };
325c6ba7c9bSHans Wippel
3260d86caffSUrsula Braun #define ISM_EVENT_REQUEST 0x0001
3270d86caffSUrsula Braun #define ISM_EVENT_RESPONSE 0x0002
3280d86caffSUrsula Braun #define ISM_EVENT_REQUEST_IR 0x00000001
3290512f69eSHans Wippel #define ISM_EVENT_CODE_SHUTDOWN 0x80
3300d86caffSUrsula Braun #define ISM_EVENT_CODE_TESTLINK 0x83
3310d86caffSUrsula Braun
3320512f69eSHans Wippel union smcd_sw_event_info {
3330512f69eSHans Wippel u64 info;
3340512f69eSHans Wippel struct {
3350512f69eSHans Wippel u8 uid[SMC_LGR_ID_SIZE];
3360512f69eSHans Wippel unsigned short vlan_id;
3370512f69eSHans Wippel u16 code;
3380512f69eSHans Wippel };
3390512f69eSHans Wippel };
3400512f69eSHans Wippel
smcd_handle_sw_event(struct smc_ism_event_work * wrk)3410d86caffSUrsula Braun static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
3420d86caffSUrsula Braun {
3430512f69eSHans Wippel union smcd_sw_event_info ev_info;
3440d86caffSUrsula Braun
3450d86caffSUrsula Braun ev_info.info = wrk->event.info;
3460512f69eSHans Wippel switch (wrk->event.code) {
3470512f69eSHans Wippel case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */
3480512f69eSHans Wippel smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
3490512f69eSHans Wippel break;
3500512f69eSHans Wippel case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
3510d86caffSUrsula Braun if (ev_info.code == ISM_EVENT_REQUEST) {
3520d86caffSUrsula Braun ev_info.code = ISM_EVENT_RESPONSE;
3530d86caffSUrsula Braun wrk->smcd->ops->signal_event(wrk->smcd,
3540d86caffSUrsula Braun wrk->event.tok,
3550d86caffSUrsula Braun ISM_EVENT_REQUEST_IR,
3560d86caffSUrsula Braun ISM_EVENT_CODE_TESTLINK,
3570d86caffSUrsula Braun ev_info.info);
3580d86caffSUrsula Braun }
3590d86caffSUrsula Braun break;
3600d86caffSUrsula Braun }
3610d86caffSUrsula Braun }
3620d86caffSUrsula Braun
363c6ba7c9bSHans Wippel /* worker for SMC-D events */
smc_ism_event_work(struct work_struct * work)364c6ba7c9bSHans Wippel static void smc_ism_event_work(struct work_struct *work)
365c6ba7c9bSHans Wippel {
366c6ba7c9bSHans Wippel struct smc_ism_event_work *wrk =
367c6ba7c9bSHans Wippel container_of(work, struct smc_ism_event_work, work);
368c6ba7c9bSHans Wippel
369c6ba7c9bSHans Wippel switch (wrk->event.type) {
370c6ba7c9bSHans Wippel case ISM_EVENT_GID: /* GID event, token is peer GID */
3710512f69eSHans Wippel smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
372c6ba7c9bSHans Wippel break;
373c6ba7c9bSHans Wippel case ISM_EVENT_DMB:
374c6ba7c9bSHans Wippel break;
3750d86caffSUrsula Braun case ISM_EVENT_SWR: /* Software defined event */
3760d86caffSUrsula Braun smcd_handle_sw_event(wrk);
3770d86caffSUrsula Braun break;
378c6ba7c9bSHans Wippel }
379c6ba7c9bSHans Wippel kfree(wrk);
380c6ba7c9bSHans Wippel }
381c6ba7c9bSHans Wippel
smcd_alloc_dev(struct device * parent,const char * name,const struct smcd_ops * ops,int max_dmbs)3828c81ba20SStefan Raspl static struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
383c6ba7c9bSHans Wippel const struct smcd_ops *ops, int max_dmbs)
384c6ba7c9bSHans Wippel {
385c6ba7c9bSHans Wippel struct smcd_dev *smcd;
386c6ba7c9bSHans Wippel
3878c81ba20SStefan Raspl smcd = devm_kzalloc(parent, sizeof(*smcd), GFP_KERNEL);
388c6ba7c9bSHans Wippel if (!smcd)
389c6ba7c9bSHans Wippel return NULL;
3908c81ba20SStefan Raspl smcd->conn = devm_kcalloc(parent, max_dmbs,
3918c81ba20SStefan Raspl sizeof(struct smc_connection *), GFP_KERNEL);
3928c81ba20SStefan Raspl if (!smcd->conn)
393c6ba7c9bSHans Wippel return NULL;
394c6ba7c9bSHans Wippel
395bbeb18f2SAnirudh Rayabharam smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
396bbeb18f2SAnirudh Rayabharam WQ_MEM_RECLAIM, name);
3978c81ba20SStefan Raspl if (!smcd->event_wq)
398bbeb18f2SAnirudh Rayabharam return NULL;
399bbeb18f2SAnirudh Rayabharam
400c6ba7c9bSHans Wippel smcd->ops = ops;
401c6ba7c9bSHans Wippel
402c6ba7c9bSHans Wippel spin_lock_init(&smcd->lock);
403a0a62ee1SUrsula Braun spin_lock_init(&smcd->lgr_lock);
404c6ba7c9bSHans Wippel INIT_LIST_HEAD(&smcd->vlan);
405a2351c5dSUrsula Braun INIT_LIST_HEAD(&smcd->lgr_list);
4065edd6b9cSUrsula Braun init_waitqueue_head(&smcd->lgrs_deleted);
407c6ba7c9bSHans Wippel return smcd;
408c6ba7c9bSHans Wippel }
4098747716fSStefan Raspl
smcd_register_dev(struct ism_dev * ism)4108747716fSStefan Raspl static void smcd_register_dev(struct ism_dev *ism)
4118747716fSStefan Raspl {
412820f2100SStefan Raspl const struct smcd_ops *ops = ism_get_smcd_ops();
4138747716fSStefan Raspl struct smcd_dev *smcd;
4148747716fSStefan Raspl
415820f2100SStefan Raspl if (!ops)
416820f2100SStefan Raspl return;
417820f2100SStefan Raspl
4188747716fSStefan Raspl smcd = smcd_alloc_dev(&ism->pdev->dev, dev_name(&ism->pdev->dev), ops,
4198747716fSStefan Raspl ISM_NR_DMBS);
4208747716fSStefan Raspl if (!smcd)
4218747716fSStefan Raspl return;
4228747716fSStefan Raspl smcd->priv = ism;
4238747716fSStefan Raspl ism_set_priv(ism, &smc_ism_client, smcd);
4248747716fSStefan Raspl if (smc_pnetid_by_dev_port(&ism->pdev->dev, 0, smcd->pnetid))
4258747716fSStefan Raspl smc_pnetid_by_table_smcd(smcd);
426444d7be9SJulian Wiedmann
42782087c03SUrsula Braun mutex_lock(&smcd_dev_list.mutex);
428201091ebSUrsula Braun if (list_empty(&smcd_dev_list.list)) {
429201091ebSUrsula Braun u8 *system_eid = NULL;
430201091ebSUrsula Braun
4310a2f4f98SStefan Raspl system_eid = smcd->ops->get_system_eid();
432*f947568eSStefan Raspl if (smcd->ops->supports_v2()) {
433201091ebSUrsula Braun smc_ism_v2_capable = true;
43411a26c59SKarsten Graul memcpy(smc_ism_v2_system_eid, system_eid,
43511a26c59SKarsten Graul SMC_MAX_EID_LEN);
43611a26c59SKarsten Graul }
437201091ebSUrsula Braun }
438d70bf4f7SUrsula Braun /* sort list: devices without pnetid before devices with pnetid */
439d70bf4f7SUrsula Braun if (smcd->pnetid[0])
440c6ba7c9bSHans Wippel list_add_tail(&smcd->list, &smcd_dev_list.list);
441d70bf4f7SUrsula Braun else
442d70bf4f7SUrsula Braun list_add(&smcd->list, &smcd_dev_list.list);
44382087c03SUrsula Braun mutex_unlock(&smcd_dev_list.mutex);
444c6ba7c9bSHans Wippel
4450a99be43SKarsten Graul pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
4468c81ba20SStefan Raspl dev_name(&ism->dev), smcd->pnetid,
4470a99be43SKarsten Graul smcd->pnetid_by_user ? " (user defined)" : "");
4480a99be43SKarsten Graul
4498747716fSStefan Raspl return;
450c6ba7c9bSHans Wippel }
451c6ba7c9bSHans Wippel
smcd_unregister_dev(struct ism_dev * ism)4528747716fSStefan Raspl static void smcd_unregister_dev(struct ism_dev *ism)
453c6ba7c9bSHans Wippel {
4548747716fSStefan Raspl struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
4558747716fSStefan Raspl
4560a99be43SKarsten Graul pr_warn_ratelimited("smc: removing smcd device %s\n",
4578c81ba20SStefan Raspl dev_name(&ism->dev));
458c40bff41SStefan Raspl smcd->going_away = 1;
459c40bff41SStefan Raspl smc_smcd_terminate_all(smcd);
46082087c03SUrsula Braun mutex_lock(&smcd_dev_list.mutex);
46150c6b20eSUrsula Braun list_del_init(&smcd->list);
46282087c03SUrsula Braun mutex_unlock(&smcd_dev_list.mutex);
463c6ba7c9bSHans Wippel destroy_workqueue(smcd->event_wq);
464c6ba7c9bSHans Wippel }
465c6ba7c9bSHans Wippel
466c6ba7c9bSHans Wippel /* SMCD Device event handler. Called from ISM device interrupt handler.
4678747716fSStefan Raspl * Parameters are ism device pointer,
468c6ba7c9bSHans Wippel * - event->type (0 --> DMB, 1 --> GID),
469c6ba7c9bSHans Wippel * - event->code (event code),
470c6ba7c9bSHans Wippel * - event->tok (either DMB token when event type 0, or GID when event type 1)
471c6ba7c9bSHans Wippel * - event->time (time of day)
472c6ba7c9bSHans Wippel * - event->info (debug info).
473c6ba7c9bSHans Wippel *
474c6ba7c9bSHans Wippel * Context:
475c6ba7c9bSHans Wippel * - Function called in IRQ context from ISM device driver event handler.
476c6ba7c9bSHans Wippel */
smcd_handle_event(struct ism_dev * ism,struct ism_event * event)4778747716fSStefan Raspl static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event)
478c6ba7c9bSHans Wippel {
4798747716fSStefan Raspl struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
480c6ba7c9bSHans Wippel struct smc_ism_event_work *wrk;
481c6ba7c9bSHans Wippel
482c3d9494eSUrsula Braun if (smcd->going_away)
483c3d9494eSUrsula Braun return;
484c6ba7c9bSHans Wippel /* copy event to event work queue, and let it be handled there */
485c6ba7c9bSHans Wippel wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
486c6ba7c9bSHans Wippel if (!wrk)
487c6ba7c9bSHans Wippel return;
488c6ba7c9bSHans Wippel INIT_WORK(&wrk->work, smc_ism_event_work);
489c6ba7c9bSHans Wippel wrk->smcd = smcd;
490c6ba7c9bSHans Wippel wrk->event = *event;
491c6ba7c9bSHans Wippel queue_work(smcd->event_wq, &wrk->work);
492c6ba7c9bSHans Wippel }
493c6ba7c9bSHans Wippel
494c6ba7c9bSHans Wippel /* SMCD Device interrupt handler. Called from ISM device interrupt handler.
4958747716fSStefan Raspl * Parameters are the ism device pointer, DMB number, and the DMBE bitmask.
4968b2fed8eSStefan Raspl * Find the connection and schedule the tasklet for this connection.
497c6ba7c9bSHans Wippel *
498c6ba7c9bSHans Wippel * Context:
499c6ba7c9bSHans Wippel * - Function called in IRQ context from ISM device driver IRQ handler.
500c6ba7c9bSHans Wippel */
smcd_handle_irq(struct ism_dev * ism,unsigned int dmbno,u16 dmbemask)5018747716fSStefan Raspl static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
5028747716fSStefan Raspl u16 dmbemask)
503c6ba7c9bSHans Wippel {
5048747716fSStefan Raspl struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
505be244f28SHans Wippel struct smc_connection *conn = NULL;
506be244f28SHans Wippel unsigned long flags;
507be244f28SHans Wippel
508be244f28SHans Wippel spin_lock_irqsave(&smcd->lock, flags);
509be244f28SHans Wippel conn = smcd->conn[dmbno];
51042bfba9eSUrsula Braun if (conn && !conn->killed)
511be244f28SHans Wippel tasklet_schedule(&conn->rx_tsklet);
512be244f28SHans Wippel spin_unlock_irqrestore(&smcd->lock, flags);
513c6ba7c9bSHans Wippel }
514820f2100SStefan Raspl #endif
515820f2100SStefan Raspl
smc_ism_signal_shutdown(struct smc_link_group * lgr)516820f2100SStefan Raspl int smc_ism_signal_shutdown(struct smc_link_group *lgr)
517820f2100SStefan Raspl {
518820f2100SStefan Raspl int rc = 0;
519820f2100SStefan Raspl #if IS_ENABLED(CONFIG_ISM)
520820f2100SStefan Raspl union smcd_sw_event_info ev_info;
521820f2100SStefan Raspl
522820f2100SStefan Raspl if (lgr->peer_shutdown)
523820f2100SStefan Raspl return 0;
524820f2100SStefan Raspl
525820f2100SStefan Raspl memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
526820f2100SStefan Raspl ev_info.vlan_id = lgr->vlan_id;
527820f2100SStefan Raspl ev_info.code = ISM_EVENT_REQUEST;
528820f2100SStefan Raspl rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
529820f2100SStefan Raspl ISM_EVENT_REQUEST_IR,
530820f2100SStefan Raspl ISM_EVENT_CODE_SHUTDOWN,
531820f2100SStefan Raspl ev_info.info);
532820f2100SStefan Raspl #endif
533820f2100SStefan Raspl return rc;
534820f2100SStefan Raspl }
535201091ebSUrsula Braun
smc_ism_init(void)5368747716fSStefan Raspl int smc_ism_init(void)
537201091ebSUrsula Braun {
538820f2100SStefan Raspl int rc = 0;
539820f2100SStefan Raspl
540820f2100SStefan Raspl #if IS_ENABLED(CONFIG_ISM)
541201091ebSUrsula Braun smc_ism_v2_capable = false;
54211a26c59SKarsten Graul memset(smc_ism_v2_system_eid, 0, SMC_MAX_EID_LEN);
543820f2100SStefan Raspl
544820f2100SStefan Raspl rc = ism_register_client(&smc_ism_client);
5458747716fSStefan Raspl #endif
546820f2100SStefan Raspl return rc;
5478747716fSStefan Raspl }
5488747716fSStefan Raspl
smc_ism_exit(void)5498747716fSStefan Raspl void smc_ism_exit(void)
5508747716fSStefan Raspl {
5518747716fSStefan Raspl #if IS_ENABLED(CONFIG_ISM)
5528747716fSStefan Raspl ism_unregister_client(&smc_ism_client);
5538747716fSStefan Raspl #endif
554201091ebSUrsula Braun }
555