net/smc: urgent data support

Add support for out of band data send and receive.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/smc/smc.h b/net/smc/smc.h
index a1467e411645..51ae1f10d81a 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -114,6 +114,12 @@ struct smc_host_cdc_msg {		/* Connection Data Control message */
         u8                              reserved[18];
 } __aligned(8);
 
+enum smc_urg_state {
+        SMC_URG_VALID,                  /* data present */
+        SMC_URG_NOTYET,                 /* data pending */
+        SMC_URG_READ                    /* data was already read */
+};
+
 struct smc_connection {
         struct rb_node          alert_node;
         struct smc_link_group   *lgr;           /* link group of connection */
@@ -160,6 +166,15 @@ struct smc_connection {
         union smc_host_cursor   rx_curs_confirmed; /* confirmed to peer
                                                     * source of snd_una ?
                                                     */
+        union smc_host_cursor   urg_curs;       /* points at urgent byte */
+        enum smc_urg_state      urg_state;
+        bool                    urg_tx_pend;    /* urgent data staged */
+        bool                    urg_rx_skip_pend;
+                                                /* indicate urgent oob data
+                                                 * read, but previous regular
+                                                 * data still pending
+                                                 */
+        char                    urg_rx_byte;    /* urgent byte */
         atomic_t                bytes_to_rcv;   /* arrived data,
                                                  * not yet received
                                                  */