netdev - [PATCH net-next v6 5/7] ixgbe: Add GET_RSS_KEY command to VF-PF channel commands set

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Message-Id: <1427050887-19412-6-git-send-email-vladz@cloudius-systems.com>
Date:	Sun, 22 Mar 2015 21:01:25 +0200
From:	Vlad Zolotarov <vladz@...udius-systems.com>
To:	netdev@...r.kernel.org
Cc:	jeffrey.t.kirsher@...el.com, avi@...udius-systems.com,
	gleb@...udius-systems.com,
	Vlad Zolotarov <vladz@...udius-systems.com>
Subject: [PATCH net-next v6 5/7] ixgbe: Add GET_RSS_KEY command to VF-PF channel commands set

For 82599 and x540 VFs and PF share the same RSS Key. Therefore we will return
the same RSS key for all VFs.

x550 on the other hand has a separate RSS Key for every pool.

Signed-off-by: Vlad Zolotarov <vladz@...udius-systems.com>
---
New in v5:
   - Use a newly added netdev op to allow/prevent the RSS Hash Key querying on a per-VF
     basis.

New in v3:
   - Added a support for x550 devices.

New in v1 (compared to RFC):
   - Use "if-else" statement instead of a "switch-case" for a single option case
     (in ixgbe_get_vf_rss_key()).
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h   |  2 ++
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 27 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
index f9b5eae..3f14373 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
@@ -105,6 +105,8 @@ enum ixgbe_pfvf_api_rev {
 #define IXGBE_VF_RETA_SZ        1	/* Number of RETA DWs to bring */
 #define IXGBE_VF_RETA_OFFSET    2	/* Offset in RETA */
 
+#define IXGBE_VF_GET_RSS_KEY	0x0b	/* get RSS key */
+
 /* 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 301bb1b..78517a1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -1016,6 +1016,30 @@ static int ixgbe_get_vf_reta(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 	return 0;
 }
 
+static int ixgbe_get_vf_rss_key(struct ixgbe_adapter *adapter,
+				u32 *msgbuf, u32 vf)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	int i;
+	u32 *rss_key = &msgbuf[1];
+
+	/* verify the PF is supporting the correct API */
+	if (!adapter->vfinfo[vf].rss_query_enabled ||
+	    (adapter->vfinfo[vf].vf_api != ixgbe_mbox_api_12))
+		return -EPERM;
+
+	/* Read the RSS KEY */
+	if (hw->mac.type >= ixgbe_mac_X550) {
+		for (i = 0; i < 10; i++)
+			rss_key[i] = IXGBE_READ_REG(hw,
+						IXGBE_PFVFRSSRK(i, vf));
+	} else
+		for (i = 0; i < 10; i++)
+			rss_key[i] = IXGBE_READ_REG(hw, IXGBE_RSSRK(i));
+
+	return 0;
+}
+
 static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
 {
 	u32 mbx_size = IXGBE_VFMAILBOX_SIZE;
@@ -1075,6 +1099,9 @@ static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
 	case IXGBE_VF_GET_RETA:
 		retval = ixgbe_get_vf_reta(adapter, msgbuf, vf);
 		break;
+	case IXGBE_VF_GET_RSS_KEY:
+		retval = ixgbe_get_vf_rss_key(adapter, msgbuf, vf);
+		break;
 	default:
 		e_err(drv, "Unhandled Msg %8.8x\n", msgbuf[0]);
 		retval = IXGBE_ERR_MBX;
-- 
2.1.0

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