Commit 57b49924 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller
Browse files

net/smc: rkey processing for a new link as SMC server 



Part of SMC server new link establishment is the exchange of rkeys for
used buffers.
Loop over all used RMB buffers and send ADD_LINK_CONTINUE LLC messages
to the peer.

Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Reviewed-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2d2209f2

net/smc/smc_llc.c

+42 −1
Original line number Diff line number Diff line
@@ -863,6 +863,47 @@ static void smc_llc_process_cli_add_link(struct smc_link_group *lgr) 
	mutex_unlock(&lgr->llc_conf_mutex);

}



static int smc_llc_srv_rkey_exchange(struct smc_link *link,

				     struct smc_link *link_new)

{

	struct smc_llc_msg_add_link_cont *addc_llc;

	struct smc_link_group *lgr = link->lgr;

	u8 max, num_rkeys_send, num_rkeys_recv;

	struct smc_llc_qentry *qentry = NULL;

	struct smc_buf_desc *buf_pos;

	int buf_lst;

	int rc = 0;

	int i;



	mutex_lock(&lgr->rmbs_lock);

	num_rkeys_send = lgr->conns_num;

	buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);

	do {

		smc_llc_add_link_cont(link, link_new, &num_rkeys_send,

				      &buf_lst, &buf_pos);

		qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME,

				      SMC_LLC_ADD_LINK_CONT);

		if (!qentry) {

			rc = -ETIMEDOUT;

			goto out;

		}

		addc_llc = &qentry->msg.add_link_cont;

		num_rkeys_recv = addc_llc->num_rkeys;

		max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);

		for (i = 0; i < max; i++) {

			smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,

				       addc_llc->rt[i].rmb_key,

				       addc_llc->rt[i].rmb_vaddr_new,

				       addc_llc->rt[i].rmb_key_new);

			num_rkeys_recv--;

		}

		smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);

	} while (num_rkeys_send || num_rkeys_recv);

out:

	mutex_unlock(&lgr->rmbs_lock);

	return rc;

}



int smc_llc_srv_add_link(struct smc_link *link)

{

	enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
@@ -923,7 +964,7 @@ int smc_llc_srv_add_link(struct smc_link *link) 
	rc = smcr_buf_reg_lgr(link_new);

	if (rc)

		goto out_err;

	/* tbd: rc = smc_llc_srv_rkey_exchange(link, link_new); */

	rc = smc_llc_srv_rkey_exchange(link, link_new);

	if (rc)

		goto out_err;

	/* tbd: rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t); */

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