[PATCH net-next 05/13] net/smc: rkey processing for a new link as SMC server

Karsten Graul
2020-05-02T12:35:44Z

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>
---
net/smc/smc_llc.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 954eda708c91..e1d61b6b083b 100644
--- 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); */
--
2.17.1