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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);

9
net/smc/smc_core.h
View File

@ -32,6 +32,7 @@ enum smc_lgr_role { /* possible roles of a link group */
};
enum smc_link_state { /* possible states of a link */
SMC_LNK_UNUSED, /* link is unused */
SMC_LNK_INACTIVE, /* link is inactive */
SMC_LNK_ACTIVATING, /* link is being activated */
SMC_LNK_ACTIVE, /* link is active */
@ -295,6 +296,14 @@ static inline struct smc_connection *smc_lgr_find_conn(
return res;
}
/* returns true if the specified link is usable */
static inline bool smc_link_usable(struct smc_link *lnk)
{
if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
return false;
return true;
}
struct smc_sock;
struct smc_clc_msg_accept_confirm;
struct smc_clc_msg_local;

4
net/smc/smc_llc.c
View File

@ -372,7 +372,7 @@ static void smc_llc_send_message_work(struct work_struct *work)
struct smc_wr_buf *wr_buf;
int rc;
if (llcwrk->link->state == SMC_LNK_INACTIVE)
if (!smc_link_usable(llcwrk->link))
goto out;
rc = smc_llc_add_pending_send(llcwrk->link, &wr_buf, &pend);
if (rc)
@ -562,7 +562,7 @@ static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
return; /* short message */
if (llc->raw.hdr.length != sizeof(*llc))
return; /* invalid message */
if (link->state == SMC_LNK_INACTIVE)
if (!smc_link_usable(link))
return; /* link not active, drop msg */
switch (llc->raw.hdr.common.type) {

11
net/smc/smc_llc.h
View File

@ -35,6 +35,17 @@ enum smc_llc_msg_type {
SMC_LLC_DELETE_RKEY = 0x09,
};
/* returns a usable link of the link group, or NULL */
static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
{
int i;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
if (smc_link_usable(&lgr->lnk[i]))
return &lgr->lnk[i];
return NULL;
}
/* transmit */
int smc_llc_send_confirm_link(struct smc_link *lnk,
enum smc_llc_reqresp reqresp);

2
net/smc/smc_wr.c
View File

@ -207,7 +207,7 @@ int smc_wr_tx_get_free_slot(struct smc_link *link,
} else {
rc = wait_event_interruptible_timeout(
link->wr_tx_wait,
link->state == SMC_LNK_INACTIVE ||
!smc_link_usable(link) ||
lgr->terminating ||
(smc_wr_tx_get_free_slot_index(link, &idx) != -EBUSY),
SMC_WR_TX_WAIT_FREE_SLOT_TIME);