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Commit 60e03c62 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller
Browse files

net/smc: add infrastructure to send delete rkey messages 



Add the infrastructure to send LLC messages of type DELETE RKEY to
unregister a shared memory region at the peer.

Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4600cfc3

net/smc/smc_core.h

+3 −0
Original line number Diff line number Diff line
@@ -109,6 +109,9 @@ struct smc_link { 
	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 mutex		llc_delete_rkey_mutex; /* serialize usage */

};



/* For now we just allow one parallel link per link group. The SMC protocol

net/smc/smc_llc.c

+52 −1
Original line number Diff line number Diff line
@@ -238,6 +238,29 @@ static int smc_llc_send_confirm_rkey(struct smc_link *link, 
	return rc;

}



/* send LLC delete rkey request */

static int smc_llc_send_delete_rkey(struct smc_link *link,

				    struct smc_buf_desc *rmb_desc)

{

	struct smc_llc_msg_delete_rkey *rkeyllc;

	struct smc_wr_tx_pend_priv *pend;

	struct smc_wr_buf *wr_buf;

	int rc;



	rc = smc_llc_add_pending_send(link, &wr_buf, &pend);

	if (rc)

		return rc;

	rkeyllc = (struct smc_llc_msg_delete_rkey *)wr_buf;

	memset(rkeyllc, 0, sizeof(*rkeyllc));

	rkeyllc->hd.common.type = SMC_LLC_DELETE_RKEY;

	rkeyllc->hd.length = sizeof(struct smc_llc_msg_delete_rkey);

	rkeyllc->num_rkeys = 1;

	rkeyllc->rkey[0] = htonl(rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);

	/* send llc message */

	rc = smc_wr_tx_send(link, pend);

	return rc;

}



/* prepare an add link message */

static void smc_llc_prep_add_link(struct smc_llc_msg_add_link *addllc,

				  struct smc_link *link, u8 mac[], u8 gid[],
@@ -509,7 +532,9 @@ static void smc_llc_rx_delete_rkey(struct smc_link *link, 
	int i, max;



	if (llc->hd.flags & SMC_LLC_FLAG_RESP) {

		/* unused as long as we don't send this type of msg */

		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++) {
@@ -610,6 +635,8 @@ int smc_llc_link_init(struct smc_link *link) 
	init_completion(&link->llc_add);

	init_completion(&link->llc_add_resp);

	init_completion(&link->llc_confirm_rkey);

	init_completion(&link->llc_delete_rkey);

	mutex_init(&link->llc_delete_rkey_mutex);

	init_completion(&link->llc_testlink_resp);

	INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work);

	return 0;
@@ -650,6 +677,7 @@ 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);

	rc = smc_llc_send_confirm_rkey(link, rmb_desc);

	if (rc)
@@ -662,6 +690,29 @@ int smc_llc_do_confirm_rkey(struct smc_link *link, 
	return 0;

}



/* unregister an rtoken at the remote peer */

int smc_llc_do_delete_rkey(struct smc_link *link,

			   struct smc_buf_desc *rmb_desc)

{

	int rc;



	mutex_lock(&link->llc_delete_rkey_mutex);

	reinit_completion(&link->llc_delete_rkey);

	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 = -EFAULT;

	else

		rc = 0;

out:

	mutex_unlock(&link->llc_delete_rkey_mutex);

	return rc;

}



/***************************** init, exit, misc ******************************/



static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {

net/smc/smc_llc.h

+2 −0
Original line number Diff line number Diff line
@@ -49,6 +49,8 @@ void smc_llc_link_inactive(struct smc_link *link); 
void smc_llc_link_clear(struct smc_link *link);

int smc_llc_do_confirm_rkey(struct smc_link *link,

			    struct smc_buf_desc *rmb_desc);

int smc_llc_do_delete_rkey(struct smc_link *link,

			   struct smc_buf_desc *rmb_desc);

int smc_llc_init(void) __init;



#endif /* SMC_LLC_H */