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Date: Fri, 17 Dec 2010 17:00:43 -0800
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: netdev@...r.kernel.org
Subject: [RFC PATCH 2/3] ixgbe: example of how to update ixgbe to make use of
in-kernel Toeplitz hash
This change allows ixgbe to make use of the in-kernel Toeplitz hashing so
that RX and TX hash queues can be matched up.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
drivers/net/ixgbe/ixgbe_main.c | 47 ++++++++++++++++++++++------------------
1 files changed, 26 insertions(+), 21 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index a060610..0d0fcde 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -42,6 +42,7 @@
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <scsi/fc/fc_fcoe.h>
+#include <linux/toeplitz.h>
#include "ixgbe.h"
#include "ixgbe_common.h"
@@ -2847,27 +2848,31 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
- static const u32 seed[10] = { 0xE291D73D, 0x1805EC6C, 0x2A94B30D,
- 0xA54F2BEC, 0xEA49AF7C, 0xE214AD3D, 0xB855AABE,
- 0x6A3E67EA, 0x14364D17, 0x3BED200D};
- u32 mrqc = 0, reta = 0;
+ u32 mrqc = 0;
u32 rxcsum;
- int i, j;
+ int i, j, indices;
int mask;
/* Fill out hash function seeds */
- for (i = 0; i < 10; i++)
- IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), seed[i]);
+ for (i = 0; i < 10; i++) {
+ u32 toeplitz_key = (u32)toeplitz_get_key_byte((4 * i));
+ toeplitz_key |= (u32)toeplitz_get_key_byte((4 * i) + 1) << 8;
+ toeplitz_key |= (u32)toeplitz_get_key_byte((4 * i) + 2) << 16;
+ toeplitz_key |= (u32)toeplitz_get_key_byte((4 * i) + 3) << 24;
+ IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), toeplitz_key);
+ }
/* Fill out redirection table */
- for (i = 0, j = 0; i < 128; i++, j++) {
- if (j == adapter->ring_feature[RING_F_RSS].indices)
- j = 0;
+ indices = adapter->ring_feature[RING_F_RSS].indices;
+ for (i = 0; i < 32; i++) {
+ u32 reta = 0;
/* reta = 4-byte sliding window of
* 0x00..(indices-1)(indices-1)00..etc. */
- reta = (reta << 8) | (j * 0x11);
- if ((i & 3) == 3)
- IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2), reta);
+ for (j = 0; j < 4; j++) {
+ u32 entry = (indices * ((i * 4) + j)) >> 7;
+ reta |= entry << (8 * j);
+ }
+ IXGBE_WRITE_REG(hw, IXGBE_RETA(i), reta);
}
/* Disable indicating checksum in descriptor, enables RSS hash */
@@ -6643,14 +6648,8 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
#endif
}
}
-#endif
-
- if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
- while (unlikely(txq >= dev->real_num_tx_queues))
- txq -= dev->real_num_tx_queues;
- return txq;
- }
+#endif
if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
if (skb->priority == TC_PRIO_CONTROL)
txq = adapter->ring_feature[RING_F_DCB].indices-1;
@@ -6660,7 +6659,13 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
return txq;
}
- return skb_tx_hash(dev, skb);
+ if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
+ while (unlikely(txq >= dev->real_num_tx_queues))
+ txq -= dev->real_num_tx_queues;
+ return txq;
+ }
+
+ return toeplitz_select_queue(dev, skb);
}
netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
--
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