netdev - [PATCH net-next 04/14] net/smc: add logic to evaluate CONFIRM

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Message-Id: <20200430135551.26267-5-kgraul@linux.ibm.com>
Date:   Thu, 30 Apr 2020 15:55:41 +0200
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        heiko.carstens@...ibm.com, raspl@...ux.ibm.com,
        ubraun@...ux.ibm.com
Subject: [PATCH net-next 04/14] net/smc: add logic to evaluate CONFIRM_LINK messages to LLC layer

Introduce smc_llc_eval_conf_link() to evaluate the CONFIRM_LINK message
contents. This implements this logic at the LLC layer. The function will
be used by af_smc.c to process the received LLC layer messages.

Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@...ux.ibm.com>
---
 net/smc/smc_llc.c | 11 +++++++++++
 net/smc/smc_llc.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index a146b3b43580..9248b90fe37e 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -946,6 +946,17 @@ int smc_llc_do_delete_rkey(struct smc_link *link,
 	return rc;
 }
 
+/* evaluate confirm link request or response */
+int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
+			   enum smc_llc_reqresp type)
+{
+	if (type == SMC_LLC_REQ)	/* SMC server assigns link_id */
+		qentry->link->link_id = qentry->msg.confirm_link.link_num;
+	if (!(qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
+		return -ENOTSUPP;
+	return 0;
+}
+
 /***************************** init, exit, misc ******************************/
 
 static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index 49e99ff00ee7..637acf91ffb7 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -66,6 +66,8 @@ int smc_llc_do_delete_rkey(struct smc_link *link,
 int smc_llc_flow_initiate(struct smc_link_group *lgr,
 			  enum smc_llc_flowtype type);
 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
+int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
+			   enum smc_llc_reqresp type);
 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
 				    struct smc_link *lnk,
 				    int time_out, u8 exp_msg);
-- 
2.17.1