netdev - [PATCH net-next v2 4/5] ixgbevf: Add RSS Key query code

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Date:	Wed, 31 Dec 2014 19:40:38 +0200
From:	Vlad Zolotarov <vladz@...udius-systems.com>
To:	netdev@...r.kernel.org
Cc:	gleb@...udius-systems.com, avi@...udius-systems.com,
	jeffrey.t.kirsher@...el.com,
	Vlad Zolotarov <vladz@...udius-systems.com>
Subject: [PATCH net-next v2 4/5] 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.

Signed-off-by: Vlad Zolotarov <vladz@...udius-systems.com>
---
New in v2:
   - Added a more detailed patch description.

New in v1 (compared to RFC):
   - Use "if-else" statement instead of a "switch-case" for a single option case
     (in ixgbevf_get_rss_key()).
---
 drivers/net/ethernet/intel/ixgbevf/mbx.h |  2 ++
 drivers/net/ethernet/intel/ixgbevf/vf.c  | 44 ++++++++++++++++++++++++++++++++
 drivers/net/ethernet/intel/ixgbevf/vf.h  |  1 +
 3 files changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbevf/mbx.h b/drivers/net/ethernet/intel/ixgbevf/mbx.h
index 3e148a8..9674ac8 100644
--- a/drivers/net/ethernet/intel/ixgbevf/mbx.h
+++ b/drivers/net/ethernet/intel/ixgbevf/mbx.h
@@ -110,6 +110,8 @@ enum ixgbe_pfvf_api_rev {
 #define IXGBE_VF_GET_RETA_1	0x0b /* get RETA[12..23] */
 #define IXGBE_VF_GET_RETA_2	0x0c /* get RETA[24..31] */
 
+#define IXGBE_VF_GET_RSS_KEY	0x0d /* get RSS hash key */
+
 /* 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 */
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 8b98cdf..dbac264 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c
@@ -290,6 +290,50 @@ static inline int _ixgbevf_get_reta(struct ixgbe_hw *hw, u32 *msgbuf,
 }
 
 /**
+ * ixgbevf_get_rss_key - get the RSS Random Key
+ * @hw: pointer to the HW structure
+ * @reta: buffer to fill with RETA contents.
+ *
+ * The "rss_key" buffer should be big enough to contain 10 registers.
+ *
+ * Returns: 0 on success.
+ *          if API doesn't support this operation - (-EPERM).
+ */
+int ixgbevf_get_rss_key(struct ixgbe_hw *hw, u8 *rss_key)
+{
+	int err;
+	u32 msgbuf[IXGBE_VFMAILBOX_SIZE];
+
+	/* Return and error if API doesn't support RSS Random Key retrieval */
+	if (hw->api_version != ixgbe_mbox_api_12)
+		return -EPERM;
+
+	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 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, 40);
+
+	return 0;
+}
+
+/**
  * ixgbevf_get_reta - get the RSS redirection table (RETA) contents.
  * @hw: pointer to the HW structure
  * @reta: buffer to fill with RETA contents.
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.h b/drivers/net/ethernet/intel/ixgbevf/vf.h
index 73c1b33..54f53f2b8 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.h
@@ -209,5 +209,6 @@ 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(struct ixgbe_hw *hw, u32 *reta);
+int ixgbevf_get_rss_key(struct ixgbe_hw *hw, u8 *rss_key);
 #endif /* __IXGBE_VF_H__ */
 
-- 
2.1.0

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