net/smc: extend LLC layer for SMC-Rv2

Add support for large v2 LLC control messages in smc_llc.c.
The new large work request buffer allows to combine control
messages into one packet that had to be spread over several
packets before.
Add handling of the new v2 LLC messages.

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

net/smc/af_smc.c

@@ -786,9 +786,9 @@ static int smc_connect_clc(struct smc_sock *smc,
 				SMC_CLC_ACCEPT, CLC_WAIT_TIME);
 }
 
-static void smc_fill_gid_list(struct smc_link_group *lgr,
-			      struct smc_gidlist *gidlist,
-			      struct smc_ib_device *known_dev, u8 *known_gid)
+void smc_fill_gid_list(struct smc_link_group *lgr,
+		       struct smc_gidlist *gidlist,
+		       struct smc_ib_device *known_dev, u8 *known_gid)
 {
 	struct smc_init_info *alt_ini = NULL;
 
@@ -1435,7 +1435,7 @@ static int smcr_serv_conf_first_link(struct smc_sock *smc)
 	smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
 
 	/* initial contact - try to establish second link */
-	smc_llc_srv_add_link(link);
+	smc_llc_srv_add_link(link, NULL);
 	return 0;
 }
 

net/smc/smc.h

@@ -56,7 +56,20 @@ enum smc_state {		/* possible states of an SMC socket */
 struct smc_link_group;
 
 struct smc_wr_rx_hdr {	/* common prefix part of LLC and CDC to demultiplex */
-	u8			type;
+	union {
+		u8 type;
+#if defined(__BIG_ENDIAN_BITFIELD)
+		struct {
+			u8 llc_version:4,
+			   llc_type:4;
+		};
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+		struct {
+			u8 llc_type:4,
+			   llc_version:4;
+		};
+#endif
+	};
 } __aligned(1);
 
 struct smc_cdc_conn_state_flags {
@@ -286,7 +299,12 @@ static inline bool using_ipsec(struct smc_sock *smc)
 }
 #endif
 
+struct smc_gidlist;
+
 struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock);
 void smc_close_non_accepted(struct sock *sk);
+void smc_fill_gid_list(struct smc_link_group *lgr,
+		       struct smc_gidlist *gidlist,
+		       struct smc_ib_device *known_dev, u8 *known_gid);
 
 #endif	/* __SMC_H */

net/smc/smc_core.h

@@ -218,6 +218,7 @@ enum smc_llc_flowtype {
 	SMC_LLC_FLOW_NONE	= 0,
 	SMC_LLC_FLOW_ADD_LINK	= 2,
 	SMC_LLC_FLOW_DEL_LINK	= 4,
+	SMC_LLC_FLOW_REQ_ADD_LINK = 5,
 	SMC_LLC_FLOW_RKEY	= 6,
 };