libqos/ahci: set the NCQ tag on command_commit

NCQ commands have the concept of a "TAG" that they need to set,
but in the AHCI world, it is mandated that the TAG always match
the command slot that you executed the NCQ from.

See AHCI 9.3.1.1.5.2 "Native Queued Commands".

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435016308-6150-14-git-send-email-jsnow@redhat.com

diff --git a/tests/libqos/ahci.c b/tests/libqos/ahci.c
index 953a32097be19edb88a63e3dae0b5924fe5f348f..7cf667affd1442f622c1489b95e2e8b9c4500174 100644 (file)
--- a/tests/libqos/ahci.c
+++ b/tests/libqos/ahci.c
@@ -857,6 +857,11 @@ void ahci_command_commit(AHCIQState *ahci, AHCICommand *cmd, uint8_t port)
     cmd->port = port;
     cmd->slot = ahci_pick_cmd(ahci, port);
 
+    if (cmd->props->ncq) {
+        NCQFIS *nfis = (NCQFIS *)&cmd->fis;
+        nfis->tag = (cmd->slot << 3) & 0xFC;
+    }
+
     /* Create a buffer for the command table */
     prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
     table_size = CMD_TBL_SIZ(prdtl);