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net/smc: add new link state and related helpers

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Before a link can be reused it must have been cleared. Lowest current
link state is INACTIVE, which does not mean that the link is already
cleared.
Add a new state UNUSED that is set when the link is cleared and can be
reused.
Add helper smc_llc_usable_link() to find an active link in a link group,
and smc_link_usable() to determine if a link is usable.

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 17:10:43 +02:00 • committed by David S. Miller
parent e07d31dc16
commit d854fcbfae
5 changed files with 42 additions and 20 deletions
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36
net/smc/smc_core.c
View file

@ -260,7 +260,7 @@ static void smc_lgr_free_work(struct work_struct *work)
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *lnk = &lgr->lnk[i];
if (lnk->state != SMC_LNK_INACTIVE)
if (smc_link_usable(lnk))
smc_llc_link_inactive(lnk);
}
}
@ -286,7 +286,7 @@ static u8 smcr_next_link_id(struct smc_link_group *lgr)
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 &&
if (smc_link_usable(&lgr->lnk[i]) &&
lgr->lnk[i].link_id == link_id)
continue;
}
@ -350,6 +350,7 @@ clear_llc_lnk:
out:
put_device(&ini->ib_dev->ibdev->dev);
memset(lnk, 0, sizeof(struct smc_link));
lnk->state = SMC_LNK_UNUSED;
if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
wake_up(&ini->ib_dev->lnks_deleted);
return rc;
@ -500,6 +501,8 @@ void smc_conn_free(struct smc_connection *conn)
static void smcr_link_clear(struct smc_link *lnk)
{
struct smc_ib_device *smcibdev;
if (lnk->peer_qpn == 0)
return;
lnk->peer_qpn = 0;
@ -510,8 +513,11 @@ static void smcr_link_clear(struct smc_link *lnk)
smc_ib_dealloc_protection_domain(lnk);
smc_wr_free_link_mem(lnk);
put_device(&lnk->smcibdev->ibdev->dev);
if (!atomic_dec_return(&lnk->smcibdev->lnk_cnt))
wake_up(&lnk->smcibdev->lnks_deleted);
smcibdev = lnk->smcibdev;
memset(lnk, 0, sizeof(struct smc_link));
lnk->state = SMC_LNK_UNUSED;
if (!atomic_dec_return(&smcibdev->lnk_cnt))
wake_up(&smcibdev->lnks_deleted);
}
static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
@ -604,9 +610,8 @@ static void smc_lgr_free(struct smc_link_group *lgr)
wake_up(&lgr->smcd->lgrs_deleted);
} else {
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state == SMC_LNK_INACTIVE)
continue;
smcr_link_clear(&lgr->lnk[i]);
if (lgr->lnk[i].state != SMC_LNK_UNUSED)
smcr_link_clear(&lgr->lnk[i]);
}
if (!atomic_dec_return(&lgr_cnt))
wake_up(&lgrs_deleted);
@ -686,7 +691,7 @@ static void smc_lgr_cleanup(struct smc_link_group *lgr)
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *lnk = &lgr->lnk[i];
if (lnk->state != SMC_LNK_INACTIVE)
if (smc_link_usable(lnk))
smc_llc_link_inactive(lnk);
}
}
@ -764,7 +769,7 @@ void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport)
continue;
/* tbd - terminate only when no more links are active */
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state == SMC_LNK_INACTIVE ||
if (!smc_link_usable(&lgr->lnk[i]) ||
lgr->lnk[i].state == SMC_LNK_DELETING)
continue;
if (lgr->lnk[i].smcibdev == smcibdev &&
@ -1161,8 +1166,7 @@ static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *lnk = &lgr->lnk[i];
if (lnk->state != SMC_LNK_ACTIVE &&
lnk->state != SMC_LNK_ACTIVATING)
if (!smc_link_usable(lnk))
continue;
if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
smcr_buf_unuse(buf_desc, lnk);
@ -1294,14 +1298,14 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
{
if (!conn->lgr || conn->lgr->is_smcd)
if (!conn->lgr || conn->lgr->is_smcd || !smc_link_usable(conn->lnk))
return;
smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
}
void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
{
if (!conn->lgr || conn->lgr->is_smcd)
if (!conn->lgr || conn->lgr->is_smcd || !smc_link_usable(conn->lnk))
return;
smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
}
@ -1313,8 +1317,7 @@ void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
if (!conn->lgr || conn->lgr->is_smcd)
return;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (conn->lgr->lnk[i].state != SMC_LNK_ACTIVE &&
conn->lgr->lnk[i].state != SMC_LNK_ACTIVATING)
if (!smc_link_usable(&conn->lgr->lnk[i]))
continue;
smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
DMA_FROM_DEVICE);
@ -1328,8 +1331,7 @@ void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
if (!conn->lgr || conn->lgr->is_smcd)
return;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (conn->lgr->lnk[i].state != SMC_LNK_ACTIVE &&
conn->lgr->lnk[i].state != SMC_LNK_ACTIVATING)
if (!smc_link_usable(&conn->lgr->lnk[i]))
continue;
smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
DMA_FROM_DEVICE);