ixgbe: Add support for GET_QUEUES message to get DCB configuration

This patch addresses several issues in regards to the combination of DCB
and SR-IOV. Specifically it allows us to send information to the VF on
which queues it should be using.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 52 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
index d4c842e1db66..42dd65e6ac97 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
@@ -71,6 +71,7 @@
 enum ixgbe_pfvf_api_rev {
         ixgbe_mbox_api_10,      /* API version 1.0, linux/freebsd VF driver */
         ixgbe_mbox_api_20,      /* API version 2.0, solaris Phase1 VF driver */
+        ixgbe_mbox_api_11,      /* API version 1.1, linux/freebsd VF driver */
         /* This value should always be last */
         ixgbe_mbox_api_unknown, /* indicates that API version is not known */
 };
@@ -86,6 +87,15 @@ enum ixgbe_pfvf_api_rev {
 #define IXGBE_VF_SET_MACVLAN    0x06 /* VF requests PF for unicast filter */
 #define IXGBE_VF_API_NEGOTIATE  0x08 /* negotiate API version */
 
+/* mailbox API, version 1.1 VF requests */
+#define IXGBE_VF_GET_QUEUES     0x09 /* get queue configuration */
+
+/* GET_QUEUES return data indices within the mailbox */
+#define IXGBE_VF_TX_QUEUES      1       /* number of Tx queues supported */
+#define IXGBE_VF_RX_QUEUES      2       /* number of Rx queues supported */
+#define IXGBE_VF_TRANS_VLAN     3       /* Indication of port vlan */
+#define IXGBE_VF_DEF_QUEUE      4       /* Default queue offset */
+
 /* length of permanent address message returned from PF */
 #define IXGBE_VF_PERMADDR_MSG_LEN 4
 /* word in permanent address message with the current multicast type */
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index b330a1c6c4c6..8bf467b94d12 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -751,6 +751,45 @@ static int ixgbe_negotiate_vf_api(struct ixgbe_adapter *adapter,
         return -1;
 }
 
+static int ixgbe_get_vf_queues(struct ixgbe_adapter *adapter,
+                               u32 *msgbuf, u32 vf)
+{
+        struct net_device *dev = adapter->netdev;
+        struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ];
+        unsigned int default_tc = 0;
+        u8 num_tcs = netdev_get_num_tc(dev);
+
+        /* verify the PF is supporting the correct APIs */
+        switch (adapter->vfinfo[vf].vf_api) {
+        case ixgbe_mbox_api_20:
+        case ixgbe_mbox_api_11:
+                break;
+        default:
+                return -1;
+        }
+
+        /* only allow 1 Tx queue for bandwidth limiting */
+        msgbuf[IXGBE_VF_TX_QUEUES] = __ALIGN_MASK(1, ~vmdq->mask);
+        msgbuf[IXGBE_VF_RX_QUEUES] = __ALIGN_MASK(1, ~vmdq->mask);
+
+        /* if TCs > 1 determine which TC belongs to default user priority */
+        if (num_tcs > 1)
+                default_tc = netdev_get_prio_tc_map(dev, adapter->default_up);
+
+        /* notify VF of need for VLAN tag stripping, and correct queue */
+        if (num_tcs)
+                msgbuf[IXGBE_VF_TRANS_VLAN] = num_tcs;
+        else if (adapter->vfinfo[vf].pf_vlan || adapter->vfinfo[vf].pf_qos)
+                msgbuf[IXGBE_VF_TRANS_VLAN] = 1;
+        else
+                msgbuf[IXGBE_VF_TRANS_VLAN] = 0;
+
+        /* notify VF of default queue */
+        msgbuf[IXGBE_VF_DEF_QUEUE] = default_tc;
+
+        return 0;
+}
+
 static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
 {
         u32 mbx_size = IXGBE_VFMAILBOX_SIZE;
@@ -804,6 +843,9 @@ static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
         case IXGBE_VF_API_NEGOTIATE:
                 retval = ixgbe_negotiate_vf_api(adapter, msgbuf, vf);
                 break;
+        case IXGBE_VF_GET_QUEUES:
+                retval = ixgbe_get_vf_queues(adapter, msgbuf, vf);
+                break;
         default:
                 e_err(drv, "Unhandled Msg %8.8x\n", msgbuf[0]);
                 retval = IXGBE_ERR_MBX;