ixgbevf: Add RSS Key query code

Add the ixgbevf_get_rss_key() function that queries the PF for an RSS
Random Key using a new VF-PF channel IXGBE_VF_GET_RSS_KEY command.

This patch adds the support for 82599 and x540 devices only. Support for
other devices will be added later.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index 0cea5e9..775d089 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -146,6 +146,7 @@ struct ixgbevf_ring {
 #define MAX_TX_QUEUES IXGBE_VF_MAX_TX_QUEUES
 #define IXGBEVF_MAX_RSS_QUEUES 2
 #define IXGBEVF_82599_RETA_SIZE        128
+#define IXGBEVF_RSS_HASH_KEY_SIZE      40
 
 #define IXGBEVF_DEFAULT_TXD    1024
 #define IXGBEVF_DEFAULT_RXD    512

diff --git a/drivers/net/ethernet/intel/ixgbevf/mbx.h b/drivers/net/ethernet/intel/ixgbevf/mbx.h
index 66e138b..82f44e0 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/mbx.h
+++ b/drivers/net/ethernet/intel/ixgbevf/mbx.h
@@ -110,6 +110,7 @@ enum ixgbe_pfvf_api_rev {
 
 /* mailbox API, version 1.2 VF requests */
 #define IXGBE_VF_GET_RETA      0x0a    /* VF request for RETA */
+#define IXGBE_VF_GET_RSS_KEY   0x0b    /* get RSS hash key */
 
 /* length of permanent address message returned from PF */
 #define IXGBE_VF_PERMADDR_MSG_LEN      4

diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 7e43f88..d1339b0 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c
@@ -326,6 +326,60 @@ int ixgbevf_get_reta_locked(struct ixgbe_hw *hw, u32 *reta, int num_rx_queues)
 }
 
 /**
+ * ixgbevf_get_rss_key_locked - get the RSS Random Key
+ * @hw: pointer to the HW structure
+ * @rss_key: buffer to fill with RSS Hash Key contents.
+ *
+ * The "rss_key" buffer should be big enough to contain 10 registers.
+ *
+ * Returns: 0 on success.
+ *          if API doesn't support this operation - (-EOPNOTSUPP).
+ */
+int ixgbevf_get_rss_key_locked(struct ixgbe_hw *hw, u8 *rss_key)
+{
+       int err;
+       u32 msgbuf[IXGBE_VFMAILBOX_SIZE];
+
+       /* We currently support the RSS Random Key retrieval for 82599 and x540
+        * devices only.
+        *
+        * Thus return an error if API doesn't support RSS Random Key retrieval
+        * or if the operation is not supported for this device type.
+        */
+       if (hw->api_version != ixgbe_mbox_api_12 ||
+           hw->mac.type >= ixgbe_mac_X550_vf)
+               return -EOPNOTSUPP;
+
+       msgbuf[0] = IXGBE_VF_GET_RSS_KEY;
+       err = hw->mbx.ops.write_posted(hw, msgbuf, 1);
+
+       if (err)
+               return err;
+
+       err = hw->mbx.ops.read_posted(hw, msgbuf, 11);
+
+       if (err)
+               return err;
+
+       msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;
+
+       /* If the operation has been refused by a PF return -EPERM */
+       if (msgbuf[0] == (IXGBE_VF_GET_RETA | IXGBE_VT_MSGTYPE_NACK))
+               return -EPERM;
+
+       /* If we didn't get an ACK there must have been
+        * some sort of mailbox error so we should treat it
+        * as such.
+        */
+       if (msgbuf[0] != (IXGBE_VF_GET_RSS_KEY | IXGBE_VT_MSGTYPE_ACK))
+               return IXGBE_ERR_MBX;
+
+       memcpy(rss_key, msgbuf + 1, IXGBEVF_RSS_HASH_KEY_SIZE);
+
+       return 0;
+}
+
+/**
  *  ixgbevf_set_rar_vf - set device MAC address
  *  @hw: pointer to hardware structure
  *  @index: Receive address register to write

diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.h b/drivers/net/ethernet/intel/ixgbevf/vf.h
index e17f9eb..d40f036 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/vf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.h
@@ -211,4 +211,5 @@ int ixgbevf_negotiate_api_version(struct ixgbe_hw *hw, int api);
 int ixgbevf_get_queues(struct ixgbe_hw *hw, unsigned int *num_tcs,
                       unsigned int *default_tc);
 int ixgbevf_get_reta_locked(struct ixgbe_hw *hw, u32 *reta, int num_rx_queues);
+int ixgbevf_get_rss_key_locked(struct ixgbe_hw *hw, u8 *rss_key);
 #endif /* __IXGBE_VF_H__ */