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: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index e2f254e..de73432 100644 (file)
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -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); */