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net/smc: introduce link_idx for link group array

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The link_id is the index of the link in the array of the link group.
When a link in the array is reused for a new link, a different unique
link_id should be used, otherwise the index in the array could collide
with the previous link at this array position.
Use a new variable link_idx as array index, and make link_id an
increasing unique id value.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2020-04-29 17:10:39 +02:00 committed by David S. Miller
parent f3c1deddb2
commit 026c381fb4
2 changed files with 31 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

34
net/smc/smc_core.c
View file

@ -245,8 +245,28 @@ static void smc_lgr_terminate_work(struct work_struct *work)
__smc_lgr_terminate(lgr, true);
}
static int smcr_link_init(struct smc_link *lnk, u8 link_id,
struct smc_init_info *ini)
/* return next unique link id for the lgr */
static u8 smcr_next_link_id(struct smc_link_group *lgr)
{
u8 link_id;
int i;
while (1) {
link_id = ++lgr->next_link_id;
if (!link_id) /* skip zero as link_id */
link_id = ++lgr->next_link_id;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state != SMC_LNK_INACTIVE &&
lgr->lnk[i].link_id == link_id)
continue;
}
break;
}
return link_id;
}
static int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
u8 link_idx, struct smc_init_info *ini)
{
u8 rndvec[3];
int rc;
@ -254,7 +274,8 @@ static int smcr_link_init(struct smc_link *lnk, u8 link_id,
get_device(&ini->ib_dev->ibdev->dev);
atomic_inc(&ini->ib_dev->lnk_cnt);
lnk->state = SMC_LNK_ACTIVATING;
lnk->link_id = link_id;
lnk->link_id = smcr_next_link_id(lgr);
lnk->link_idx = link_idx;
lnk->smcibdev = ini->ib_dev;
lnk->ibport = ini->ib_port;
lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
@ -310,6 +331,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
struct list_head *lgr_list;
struct smc_link *lnk;
spinlock_t *lgr_lock;
u8 link_idx;
int rc = 0;
int i;
@ -338,6 +360,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
INIT_LIST_HEAD(&lgr->sndbufs[i]);
INIT_LIST_HEAD(&lgr->rmbs[i]);
}
lgr->next_link_id = 0;
smc_lgr_list.num += SMC_LGR_NUM_INCR;
memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
@ -358,8 +381,9 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
SMC_SYSTEMID_LEN);
lnk = &lgr->lnk[SMC_SINGLE_LINK];
rc = smcr_link_init(lnk, SMC_SINGLE_LINK, ini);
link_idx = SMC_SINGLE_LINK;
lnk = &lgr->lnk[link_idx];
rc = smcr_link_init(lgr, lnk, link_idx, ini);
if (rc)
goto free_lgr;
lgr_list = &smc_lgr_list.list;

2
net/smc/smc_core.h
View file

@ -115,6 +115,7 @@ struct smc_link {
u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/
u8 link_id; /* unique # within link group */
u8 link_idx; /* index in lgr link array */
enum smc_link_state state; /* state of link */
struct workqueue_struct *llc_wq; /* single thread work queue */
@ -222,6 +223,7 @@ struct smc_link_group {
/* remote addr/key pairs */
DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
/* used rtoken elements */
u8 next_link_id;
};
struct { /* SMC-D */
u64 peer_gid;