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net/smc: process llc responses in tasklet context
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When llc responses are received then possible waiters for this response
are to be notified. This can be done in tasklet context, without to
use a work in the llc work queue. Move all code that handles llc
responses into smc_llc_rx_response().

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>
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Karsten Graul authored and David S. Miller committed Apr 29, 2020
1 parent 6c8968c commit ef79d43
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Showing 2 changed files with 116 additions and 108 deletions.
8 changes: 4 additions & 4 deletions net/smc/smc_core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -129,10 +129,10 @@ struct smc_link {
struct delayed_work llc_testlink_wrk; /* testlink worker */
struct completion llc_testlink_resp; /* wait for rx of testlink */
int llc_testlink_time; /* testlink interval */
struct completion llc_confirm_rkey; /* wait 4 rx of cnf rkey */
int llc_confirm_rkey_rc; /* rc from cnf rkey msg */
struct completion llc_delete_rkey; /* wait 4 rx of del rkey */
int llc_delete_rkey_rc; /* rc from del rkey msg */
struct completion llc_confirm_rkey_resp; /* w4 rx of cnf rkey */
int llc_confirm_rkey_resp_rc; /* rc from cnf rkey */
struct completion llc_delete_rkey_resp; /* w4 rx of del rkey */
int llc_delete_rkey_resp_rc; /* rc from del rkey */
struct mutex llc_delete_rkey_mutex; /* serialize usage */
};

Expand Down
216 changes: 112 additions & 104 deletions net/smc/smc_llc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -384,27 +384,17 @@ static void smc_llc_rx_confirm_link(struct smc_link *link,
struct smc_llc_msg_confirm_link *llc)
{
struct smc_link_group *lgr = smc_get_lgr(link);
int conf_rc;
int conf_rc = 0;

/* RMBE eyecatchers are not supported */
if (llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)
conf_rc = 0;
else
if (!(llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
conf_rc = ENOTSUPP;

if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_resp_rc = conf_rc;
complete(&link->llc_confirm_resp);
}
} else {
if (lgr->role == SMC_CLNT &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_rc = conf_rc;
link->link_id = llc->link_num;
complete(&link->llc_confirm);
}
if (lgr->role == SMC_CLNT &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_rc = conf_rc;
link->link_id = llc->link_num;
complete(&link->llc_confirm);
}
}

Expand All @@ -413,97 +403,72 @@ static void smc_llc_rx_add_link(struct smc_link *link,
{
struct smc_link_group *lgr = smc_get_lgr(link);

if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (link->state == SMC_LNK_ACTIVATING)
complete(&link->llc_add_resp);
} else {
if (link->state == SMC_LNK_ACTIVATING) {
complete(&link->llc_add);
return;
}
if (link->state == SMC_LNK_ACTIVATING) {
complete(&link->llc_add);
return;
}

if (lgr->role == SMC_SERV) {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_REQ);
if (lgr->role == SMC_SERV) {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_REQ);

} else {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_RESP);
}
smc_llc_send_message(link, llc);
} else {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_RESP);
}
smc_llc_send_message(link, llc);
}

static void smc_llc_rx_delete_link(struct smc_link *link,
struct smc_llc_msg_del_link *llc)
{
struct smc_link_group *lgr = smc_get_lgr(link);

if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV)
smc_lgr_schedule_free_work_fast(lgr);
smc_lgr_forget(lgr);
smc_llc_link_deleting(link);
if (lgr->role == SMC_SERV) {
/* client asks to delete this link, send request */
smc_llc_prep_delete_link(llc, link, SMC_LLC_REQ, true);
} else {
smc_lgr_forget(lgr);
smc_llc_link_deleting(link);
if (lgr->role == SMC_SERV) {
/* client asks to delete this link, send request */
smc_llc_prep_delete_link(llc, link, SMC_LLC_REQ, true);
} else {
/* server requests to delete this link, send response */
smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP, true);
}
smc_llc_send_message(link, llc);
smc_lgr_terminate_sched(lgr);
/* server requests to delete this link, send response */
smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP, true);
}
smc_llc_send_message(link, llc);
smc_lgr_terminate_sched(lgr);
}

static void smc_llc_rx_test_link(struct smc_link *link,
struct smc_llc_msg_test_link *llc)
{
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (link->state == SMC_LNK_ACTIVE)
complete(&link->llc_testlink_resp);
} else {
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
}
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
}

static void smc_llc_rx_confirm_rkey(struct smc_link *link,
struct smc_llc_msg_confirm_rkey *llc)
{
int rc;

if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
link->llc_confirm_rkey_rc = llc->hd.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_confirm_rkey);
} else {
rc = smc_rtoken_add(link,
llc->rtoken[0].rmb_vaddr,
llc->rtoken[0].rmb_key);
rc = smc_rtoken_add(link,
llc->rtoken[0].rmb_vaddr,
llc->rtoken[0].rmb_key);

/* ignore rtokens for other links, we have only one link */
/* ignore rtokens for other links, we have only one link */

llc->hd.flags |= SMC_LLC_FLAG_RESP;
if (rc < 0)
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
smc_llc_send_message(link, llc);
}
llc->hd.flags |= SMC_LLC_FLAG_RESP;
if (rc < 0)
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
smc_llc_send_message(link, llc);
}

static void smc_llc_rx_confirm_rkey_cont(struct smc_link *link,
struct smc_llc_msg_confirm_rkey_cont *llc)
{
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
/* unused as long as we don't send this type of msg */
} else {
/* ignore rtokens for other links, we have only one link */
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
}
/* ignore rtokens for other links, we have only one link */
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
}

static void smc_llc_rx_delete_rkey(struct smc_link *link,
Expand All @@ -512,25 +477,19 @@ static void smc_llc_rx_delete_rkey(struct smc_link *link,
u8 err_mask = 0;
int i, max;

if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
link->llc_delete_rkey_rc = llc->hd.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_delete_rkey);
} else {
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
for (i = 0; i < max; i++) {
if (smc_rtoken_delete(link, llc->rkey[i]))
err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
}

if (err_mask) {
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
llc->err_mask = err_mask;
}
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
for (i = 0; i < max; i++) {
if (smc_rtoken_delete(link, llc->rkey[i]))
err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
}

llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
if (err_mask) {
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
llc->err_mask = err_mask;
}

llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc);
}

/* flush the llc event queue */
Expand Down Expand Up @@ -601,6 +560,49 @@ static void smc_llc_event_work(struct work_struct *work)
spin_unlock_bh(&lgr->llc_event_q_lock);
}

/* process llc responses in tasklet context */
static void smc_llc_rx_response(struct smc_link *link, union smc_llc_msg *llc)
{
int rc = 0;

switch (llc->raw.hdr.common.type) {
case SMC_LLC_TEST_LINK:
if (link->state == SMC_LNK_ACTIVE)
complete(&link->llc_testlink_resp);
break;
case SMC_LLC_CONFIRM_LINK:
if (!(llc->raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
rc = ENOTSUPP;
if (link->lgr->role == SMC_SERV &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_resp_rc = rc;
complete(&link->llc_confirm_resp);
}
break;
case SMC_LLC_ADD_LINK:
if (link->state == SMC_LNK_ACTIVATING)
complete(&link->llc_add_resp);
break;
case SMC_LLC_DELETE_LINK:
if (link->lgr->role == SMC_SERV)
smc_lgr_schedule_free_work_fast(link->lgr);
break;
case SMC_LLC_CONFIRM_RKEY:
link->llc_confirm_rkey_resp_rc = llc->raw.hdr.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_confirm_rkey_resp);
break;
case SMC_LLC_CONFIRM_RKEY_CONT:
/* unused as long as we don't send this type of msg */
break;
case SMC_LLC_DELETE_RKEY:
link->llc_delete_rkey_resp_rc = llc->raw.hdr.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_delete_rkey_resp);
break;
}
}

/* copy received msg and add it to the event queue */
static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
{
Expand All @@ -615,6 +617,12 @@ static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
if (llc->raw.hdr.length != sizeof(*llc))
return; /* invalid message */

/* process responses immediately */
if (llc->raw.hdr.flags & SMC_LLC_FLAG_RESP) {
smc_llc_rx_response(link, llc);
return;
}

qentry = kmalloc(sizeof(*qentry), GFP_ATOMIC);
if (!qentry)
return;
Expand Down Expand Up @@ -667,8 +675,8 @@ int smc_llc_link_init(struct smc_link *link)
init_completion(&link->llc_confirm_resp);
init_completion(&link->llc_add);
init_completion(&link->llc_add_resp);
init_completion(&link->llc_confirm_rkey);
init_completion(&link->llc_delete_rkey);
init_completion(&link->llc_confirm_rkey_resp);
init_completion(&link->llc_delete_rkey_resp);
mutex_init(&link->llc_delete_rkey_mutex);
init_completion(&link->llc_testlink_resp);
INIT_WORK(&link->lgr->llc_event_work, smc_llc_event_work);
Expand Down Expand Up @@ -708,14 +716,14 @@ int smc_llc_do_confirm_rkey(struct smc_link *link,
int rc;

/* protected by mutex smc_create_lgr_pending */
reinit_completion(&link->llc_confirm_rkey);
reinit_completion(&link->llc_confirm_rkey_resp);
rc = smc_llc_send_confirm_rkey(link, rmb_desc);
if (rc)
return rc;
/* receive CONFIRM RKEY response from server over RoCE fabric */
rc = wait_for_completion_interruptible_timeout(&link->llc_confirm_rkey,
SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_confirm_rkey_rc)
rc = wait_for_completion_interruptible_timeout(
&link->llc_confirm_rkey_resp, SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_confirm_rkey_resp_rc)
return -EFAULT;
return 0;
}
Expand All @@ -729,14 +737,14 @@ int smc_llc_do_delete_rkey(struct smc_link *link,
mutex_lock(&link->llc_delete_rkey_mutex);
if (link->state != SMC_LNK_ACTIVE)
goto out;
reinit_completion(&link->llc_delete_rkey);
reinit_completion(&link->llc_delete_rkey_resp);
rc = smc_llc_send_delete_rkey(link, rmb_desc);
if (rc)
goto out;
/* receive DELETE RKEY response from server over RoCE fabric */
rc = wait_for_completion_interruptible_timeout(&link->llc_delete_rkey,
SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_delete_rkey_rc)
rc = wait_for_completion_interruptible_timeout(
&link->llc_delete_rkey_resp, SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_delete_rkey_resp_rc)
rc = -EFAULT;
else
rc = 0;
Expand Down

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