[SCSI] qla2xxx: Add iIDMA support.

iIDMA (Intelligent Interleaved Direct Memory Access) allows for
the HBA hardware to send FC frames at the rate at which they can
be received by a target device.  By taking advantage of the
higher link rate, the HBA can maximize bandwidth utilization in a
heterogeneous multi-speed SAN.

Within a fabric topology, port speed detection is done via a Name
Server command (GFPN_ID) followed by a Fabric Management command
(GPSC).  In an FCAL/N2N topology, port speed is based on the HBA
link-rate.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 859649160caa..270096441f3e 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2074,6 +2074,19 @@ qla2x00_configure_local_loop(scsi_qla_host_t *ha)
                         new_fcport->flags &= ~FCF_FABRIC_DEVICE;
                 }
 
+                /* Base iIDMA settings on HBA port speed. */
+                switch (ha->link_data_rate) {
+                case PORT_SPEED_1GB:
+                        fcport->fp_speed = cpu_to_be16(BIT_15);
+                        break;
+                case PORT_SPEED_2GB:
+                        fcport->fp_speed = cpu_to_be16(BIT_14);
+                        break;
+                case PORT_SPEED_4GB:
+                        fcport->fp_speed = cpu_to_be16(BIT_13);
+                        break;
+                }
+
                 qla2x00_update_fcport(ha, fcport);
 
                 found_devs++;
@@ -2109,6 +2122,62 @@ qla2x00_probe_for_all_luns(scsi_qla_host_t *ha)
         }
 }
 
+static void
+qla2x00_iidma_fcport(scsi_qla_host_t *ha, fc_port_t *fcport)
+{
+#define LS_UNKNOWN      2
+        static char *link_speeds[5] = { "1", "2", "?", "4" };
+        int rval;
+        uint16_t port_speed, mb[6];
+
+        if (!IS_QLA24XX(ha))
+                return;
+
+        switch (be16_to_cpu(fcport->fp_speed)) {
+        case BIT_15:
+                port_speed = PORT_SPEED_1GB;
+                break;
+        case BIT_14:
+                port_speed = PORT_SPEED_2GB;
+                break;
+        case BIT_13:
+                port_speed = PORT_SPEED_4GB;
+                break;
+        default:
+                DEBUG2(printk("scsi(%ld): %02x%02x%02x%02x%02x%02x%02x%02x -- "
+                    "unsupported FM port operating speed (%04x).\n",
+                    ha->host_no, fcport->port_name[0], fcport->port_name[1],
+                    fcport->port_name[2], fcport->port_name[3],
+                    fcport->port_name[4], fcport->port_name[5],
+                    fcport->port_name[6], fcport->port_name[7],
+                    be16_to_cpu(fcport->fp_speed)));
+                port_speed = PORT_SPEED_UNKNOWN;
+                break;
+        }
+        if (port_speed == PORT_SPEED_UNKNOWN)
+                return;
+
+        rval = qla2x00_set_idma_speed(ha, fcport->loop_id, port_speed, mb);
+        if (rval != QLA_SUCCESS) {
+                DEBUG2(printk("scsi(%ld): Unable to adjust iIDMA "
+                    "%02x%02x%02x%02x%02x%02x%02x%02x -- %04x %x %04x %04x.\n",
+                    ha->host_no, fcport->port_name[0], fcport->port_name[1],
+                    fcport->port_name[2], fcport->port_name[3],
+                    fcport->port_name[4], fcport->port_name[5],
+                    fcport->port_name[6], fcport->port_name[7], rval,
+                    port_speed, mb[0], mb[1]));
+        } else {
+                DEBUG2(qla_printk(KERN_INFO, ha,
+                    "iIDMA adjusted to %s GB/s on "
+                    "%02x%02x%02x%02x%02x%02x%02x%02x.\n",
+                    link_speeds[port_speed], fcport->port_name[0],
+                    fcport->port_name[1], fcport->port_name[2],
+                    fcport->port_name[3], fcport->port_name[4],
+                    fcport->port_name[5], fcport->port_name[6],
+                    fcport->port_name[7]));
+        }
+}
+
 /*
  * qla2x00_update_fcport
  *      Updates device on list.
@@ -2135,6 +2204,8 @@ qla2x00_update_fcport(scsi_qla_host_t *ha, fc_port_t *fcport)
             PORT_RETRY_TIME);
         fcport->flags &= ~FCF_LOGIN_NEEDED;
 
+        qla2x00_iidma_fcport(ha, fcport);
+
         atomic_set(&fcport->state, FCS_ONLINE);
 
         if (ha->flags.init_done)
@@ -2416,6 +2487,8 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *ha, struct list_head *new_fcports)
                 } else if (qla2x00_gnn_id(ha, swl) != QLA_SUCCESS) {
                         kfree(swl);
                         swl = NULL;
+                } else if (qla2x00_gfpn_id(ha, swl) == QLA_SUCCESS) {
+                        qla2x00_gpsc(ha, swl);
                 }
         }
         swl_idx = 0;
@@ -2450,6 +2523,9 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *ha, struct list_head *new_fcports)
                                     swl[swl_idx].node_name, WWN_SIZE);
                                 memcpy(new_fcport->port_name,
                                     swl[swl_idx].port_name, WWN_SIZE);
+                                memcpy(new_fcport->fabric_port_name,
+                                    swl[swl_idx].fabric_port_name, WWN_SIZE);
+                                new_fcport->fp_speed = swl[swl_idx].fp_speed;
 
                                 if (swl[swl_idx].d_id.b.rsvd_1 != 0) {
                                         last_dev = 1;
@@ -2507,6 +2583,11 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *ha, struct list_head *new_fcports)
 
                         found++;
 
+                        /* Update port state. */
+                        memcpy(fcport->fabric_port_name,
+                            new_fcport->fabric_port_name, WWN_SIZE);
+                        fcport->fp_speed = new_fcport->fp_speed;
+
                         /*
                          * If address the same and state FCS_ONLINE, nothing
                          * changed.