[Qemu-devel] [PATCH 05/10] megasas: static SAS addresses

[Paolo Bonzini <pbonzini@redhat.com>]

From: Hannes Reinecke <hare@suse.de>

This patch introduces a new property 'sas_address' which
allows the user to specify the SAS address for the HBA.
The default address is following the NAA locally assigned
identifier format with the locally assigned address
0x525400 as used eg for the MAC addresses.
The lower bytes are set to the pci address which
will ensure uniqueness for the local machine.

The port addresses are now calculated based on the magic
number 0x1221 (which is found in real hardware, too) plus
the device number.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andreas Faerber <afaerber@suse.de>
Cc: Anthony Liguori <anthony@codemonkey.ws>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/megasas.c |   65 +++++++++++++++++++++++++++++++++++++++++++---------------
 hw/mfi.h     |    1 +
 2 files changed, 49 insertions(+), 17 deletions(-)

diff --git a/hw/megasas.c b/hw/megasas.c
index 8a4960f..c35a15d 100644
--- a/hw/megasas.c
+++ b/hw/megasas.c
@@ -38,6 +38,9 @@
 #define MEGASAS_MAX_SECTORS 0xFFFF      /* No real limit */
 #define MEGASAS_MAX_ARRAYS 128
 
+#define NAA_LOCALLY_ASSIGNED_ID 0x3ULL
+#define IEEE_COMPANY_LOCALLY_ASSIGNED 0x525400
+
 #define MEGASAS_FLAG_USE_JBOD      0
 #define MEGASAS_MASK_USE_JBOD      (1 << MEGASAS_FLAG_USE_JBOD)
 #define MEGASAS_FLAG_USE_MSIX      1
@@ -89,6 +92,8 @@ typedef struct MegasasState {
     int shutdown_event;
     int boot_event;
 
+    uint64_t sas_addr;
+
     uint64_t reply_queue_pa;
     void *reply_queue;
     int reply_queue_len;
@@ -372,14 +377,16 @@ static uint64_t megasas_fw_time(void)
     return bcd_time;
 }
 
-static uint64_t megasas_gen_sas_addr(uint64_t id)
+/*
+ * Default disk sata address
+ * 0x1221 is the magic number as
+ * present in real hardware,
+ * so use it here, too.
+ */
+static uint64_t megasas_get_sata_addr(uint16_t id)
 {
-    uint64_t addr;
-
-    addr = 0x5001a4aULL << 36;
-    addr |= id & 0xfffffffff;
-
-    return addr;
+    uint64_t addr = (0x1221ULL << 48);
+    return addr & (id << 24);
 }
 
 /*
@@ -652,10 +659,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
     size_t dcmd_size = sizeof(info);
     BusChild *kid;
     int num_ld_disks = 0;
-
-    QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
-        num_ld_disks++;
-    }
+    uint16_t sdev_id;
 
     memset(&info, 0x0, cmd->iov_size);
     if (cmd->iov_size < dcmd_size) {
@@ -669,10 +673,29 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
     info.pci.subvendor = cpu_to_le16(PCI_VENDOR_ID_LSI_LOGIC);
     info.pci.subdevice = cpu_to_le16(0x1013);
 
-    info.host.type = MFI_INFO_HOST_PCIX;
+    /*
+     * For some reason the firmware supports
+     * only up to 8 device ports.
+     * Despite supporting a far larger number
+     * of devices for the physical devices.
+     * So just display the first 8 devices
+     * in the device port list, independent
+     * of how many logical devices are actually
+     * present.
+     */
+    info.host.type = MFI_INFO_HOST_PCIE;
     info.device.type = MFI_INFO_DEV_SAS3G;
-    info.device.port_count = 2;
-    info.device.port_addr[0] = cpu_to_le64(megasas_gen_sas_addr((uint64_t)s));
+    info.device.port_count = 8;
+    QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
+        SCSIDevice *sdev = DO_UPCAST(SCSIDevice, qdev, kid->child);
+
+        if (num_ld_disks < 8) {
+            sdev_id = ((sdev->id & 0xFF) >> 8) | (sdev->lun & 0xFF);
+            info.device.port_addr[num_ld_disks] =
+                cpu_to_le64(megasas_get_sata_addr(sdev_id));
+        }
+        num_ld_disks++;
+    }
 
     memcpy(info.product_name, "MegaRAID SAS 8708EM2", 20);
     snprintf(info.serial_number, 32, "QEMU%08lx",
@@ -761,7 +784,7 @@ static int megasas_mfc_get_defaults(MegasasState *s, MegasasCmd *cmd)
         return MFI_STAT_INVALID_PARAMETER;
     }
 
-    info.sas_addr = cpu_to_le64(megasas_gen_sas_addr((uint64_t)s));
+    info.sas_addr = cpu_to_le64(s->sas_addr);
     info.stripe_size = 3;
     info.flush_time = 4;
     info.background_rate = 30;
@@ -891,7 +914,7 @@ static int megasas_dcmd_pd_get_list(MegasasState *s, MegasasCmd *cmd)
         info.addr[num_pd_disks].scsi_dev_type = sdev->type;
         info.addr[num_pd_disks].connect_port_bitmap = 0x1;
         info.addr[num_pd_disks].sas_addr[0] =
-            cpu_to_le64(megasas_gen_sas_addr((uint64_t)sdev));
+            cpu_to_le64(megasas_get_sata_addr(sdev_id));
         num_pd_disks++;
         offset += sizeof(struct mfi_pd_address);
     }
@@ -994,7 +1017,7 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
     info->slot_number = (sdev->id & 0xFF);
     info->path_info.count = 1;
     info->path_info.sas_addr[0] =
-        cpu_to_le64(megasas_gen_sas_addr((uint64_t)sdev));
+        cpu_to_le64(megasas_get_sata_addr(sdev_id));
     info->connected_port_bitmap = 0x1;
     info->device_speed = 1;
     info->link_speed = 1;
@@ -2102,6 +2125,13 @@ static int megasas_scsi_init(PCIDevice *dev)
         msix_vector_use(&s->dev, 0);
     }
 
+    if (!s->sas_addr) {
+        s->sas_addr = ((NAA_LOCALLY_ASSIGNED_ID << 24) |
+                       IEEE_COMPANY_LOCALLY_ASSIGNED) << 36;
+        s->sas_addr |= (pci_bus_num(dev->bus) << 16);
+        s->sas_addr |= (PCI_SLOT(dev->devfn) << 8);
+        s->sas_addr |= PCI_FUNC(dev->devfn);
+    }
     if (s->fw_sge >= MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE) {
         s->fw_sge = MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE;
     } else if (s->fw_sge >= 128 - MFI_PASS_FRAME_SIZE) {
@@ -2136,6 +2166,7 @@ static Property megasas_properties[] = {
                        MEGASAS_DEFAULT_SGE),
     DEFINE_PROP_UINT32("max_cmds", MegasasState, fw_cmds,
                        MEGASAS_DEFAULT_FRAMES),
+    DEFINE_PROP_HEX64("sas_address", MegasasState, sas_addr, 0),
 #ifdef USE_MSIX
     DEFINE_PROP_BIT("use_msix", MegasasState, flags,
                     MEGASAS_FLAG_USE_MSIX, false),
diff --git a/hw/mfi.h b/hw/mfi.h
index 3045d4e..436b690 100644
--- a/hw/mfi.h
+++ b/hw/mfi.h
@@ -656,6 +656,7 @@ struct mfi_info_device {
 #define MFI_INFO_DEV_SAS3G      0x02
 #define MFI_INFO_DEV_SATA1      0x04
 #define MFI_INFO_DEV_SATA3G     0x08
+#define MFI_INFO_DEV_PCIE       0x10
     uint8_t reserved[6];
     uint8_t port_count;
     uint64_t port_addr[8];
-- 
1.7.10.4