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Date: Thu, 26 Mar 2015 19:56:38 +0200
From: Vlad Zolotarov <vladz@...udius-systems.com>
To: netdev@...r.kernel.org
Cc: jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org,
avi@...udius-systems.com, gleb@...udius-systems.com,
Vlad Zolotarov <vladz@...udius-systems.com>
Subject: [PATCH net-next v1 1/2] ixgbe: Refactor the RSS configuration code.
This patch is a preparation for enablement of ethtool RSS indirection table
and hash key querying. We don't want to read registers every time the RSS info
is queried. Therefore we will store its current content in the
arrays in the adapter struct and will read it from there (instead of from
registers) when requested.
Will change the code that writes the indirection table and hash key into the HW registers
to take its content from these arrays. This will also simplify the indirection
table updating ethtool callback implementation in the future.
Signed-off-by: Vlad Zolotarov <vladz@...udius-systems.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 +
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 143 ++++++++++++++++++--------
drivers/net/ethernet/intel/ixgbe/ixgbe_type.h | 7 ++
3 files changed, 109 insertions(+), 43 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 5e44e48..402d182 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -766,6 +766,8 @@ struct ixgbe_adapter {
u8 default_up;
unsigned long fwd_bitmask; /* Bitmask indicating in use pools */
+ u8 rss_indir_tbl[IXGBE_MAX_RETA_ENTRIES];
+ u32 rss_key[IXGBE_RSS_KEY_SIZE / sizeof(u32)];
};
static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 8853d52..e3de0c9 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -3228,51 +3228,54 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(reg_idx), srrctl);
}
-static void ixgbe_setup_reta(struct ixgbe_adapter *adapter, const u32 *seed)
+/**
+ * Return a number of entries in the RSS indirection table
+ *
+ * @adapter: device handle
+ *
+ * - 82598/82599/X540: 128
+ * - X550(non-SRIOV mode): 512
+ * - X550(SRIOV mode): 64
+ */
+static u32 ixgbe_rss_indir_tbl_entries(struct ixgbe_adapter *adapter)
+{
+ if (adapter->hw.mac.type < ixgbe_mac_X550)
+ return 128;
+ else if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
+ return 64;
+ else
+ return 512;
+}
+
+/**
+ * Write the RETA table to HW
+ *
+ * @adapter: device handle
+ *
+ * Write the RSS redirection table stored in adapter.rss_indir_tbl[] to HW.
+ */
+static void ixgbe_store_reta(struct ixgbe_adapter *adapter)
{
+ u32 i, reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
struct ixgbe_hw *hw = &adapter->hw;
u32 reta = 0;
- int i, j;
- int reta_entries = 128;
- u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
int indices_multi;
-
- /*
- * Program table for at least 2 queues w/ SR-IOV so that VFs can
- * make full use of any rings they may have. We will use the
- * PSRTYPE register to control how many rings we use within the PF.
- */
- if ((adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) && (rss_i < 2))
- rss_i = 2;
-
- /* Fill out hash function seeds */
- for (i = 0; i < 10; i++)
- IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), seed[i]);
+ u8 *indir_tbl = adapter->rss_indir_tbl;
/* Fill out the redirection table as follows:
- * 82598: 128 (8 bit wide) entries containing pair of 4 bit RSS indices
- * 82599/X540: 128 (8 bit wide) entries containing 4 bit RSS index
- * X550: 512 (8 bit wide) entries containing 6 bit RSS index
+ * - 82598: 8 bit wide entries containing pair of 4 bit RSS
+ * indices.
+ * - 82599/X540: 8 bit wide entries containing 4 bit RSS index
+ * - X550: 8 bit wide entries containing 6 bit RSS index
*/
if (adapter->hw.mac.type == ixgbe_mac_82598EB)
indices_multi = 0x11;
else
indices_multi = 0x1;
- switch (adapter->hw.mac.type) {
- case ixgbe_mac_X550:
- case ixgbe_mac_X550EM_x:
- if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED))
- reta_entries = 512;
- default:
- break;
- }
-
- /* Fill out redirection table */
- for (i = 0, j = 0; i < reta_entries; i++, j++) {
- if (j == rss_i)
- j = 0;
- reta = (reta << 8) | (j * indices_multi);
+ /* Write redirection table to HW */
+ for (i = 0; i < reta_entries; i++) {
+ reta = (reta << 8) | (indices_multi * indir_tbl[i]);
if ((i & 3) == 3) {
if (i < 128)
IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2), reta);
@@ -3283,34 +3286,88 @@ static void ixgbe_setup_reta(struct ixgbe_adapter *adapter, const u32 *seed)
}
}
-static void ixgbe_setup_vfreta(struct ixgbe_adapter *adapter, const u32 *seed)
+/**
+ * Write the RETA table to HW (for x550 devices in SRIOV mode)
+ *
+ * @adapter: device handle
+ *
+ * Write the RSS redirection table stored in adapter.rss_indir_tbl[] to HW.
+ */
+static void ixgbe_store_vfreta(struct ixgbe_adapter *adapter)
{
+ u32 i, reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
struct ixgbe_hw *hw = &adapter->hw;
u32 vfreta = 0;
+ unsigned int pf_pool = adapter->num_vfs;
+
+ /* Write redirection table to HW */
+ for (i = 0; i < reta_entries; i++) {
+ vfreta = (vfreta << 8) | adapter->rss_indir_tbl[i];
+ if ((i & 3) == 3)
+ IXGBE_WRITE_REG(hw, IXGBE_PFVFRETA(i >> 2, pf_pool),
+ vfreta);
+ }
+}
+
+static void ixgbe_setup_reta(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 i, j;
+ u32 reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
+ u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
+
+ /*
+ * Program table for at least 2 queues w/ SR-IOV so that VFs can
+ * make full use of any rings they may have. We will use the
+ * PSRTYPE register to control how many rings we use within the PF.
+ */
+ if ((adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) && (rss_i < 2))
+ rss_i = 2;
+
+ /* Fill out hash function seeds */
+ for (i = 0; i < 10; i++)
+ IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), adapter->rss_key[i]);
+
+ /* Fill out redirection table */
+ memset(adapter->rss_indir_tbl, 0, sizeof(adapter->rss_indir_tbl));
+
+ for (i = 0, j = 0; i < reta_entries; i++, j++) {
+ if (j == rss_i)
+ j = 0;
+
+ adapter->rss_indir_tbl[i] = j;
+ }
+
+ ixgbe_store_reta(adapter);
+}
+
+static void ixgbe_setup_vfreta(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
unsigned int pf_pool = adapter->num_vfs;
int i, j;
/* Fill out hash function seeds */
for (i = 0; i < 10; i++)
- IXGBE_WRITE_REG(hw, IXGBE_PFVFRSSRK(i, pf_pool), seed[i]);
+ IXGBE_WRITE_REG(hw, IXGBE_PFVFRSSRK(i, pf_pool),
+ adapter->rss_key[i]);
/* Fill out the redirection table */
for (i = 0, j = 0; i < 64; i++, j++) {
if (j == rss_i)
j = 0;
- vfreta = (vfreta << 8) | j;
- if ((i & 3) == 3)
- IXGBE_WRITE_REG(hw, IXGBE_PFVFRETA(i >> 2, pf_pool),
- vfreta);
+
+ adapter->rss_indir_tbl[i] = j;
}
+
+ ixgbe_store_vfreta(adapter);
}
static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 mrqc = 0, rss_field = 0, vfmrqc = 0;
- u32 rss_key[10];
u32 rxcsum;
/* Disable indicating checksum in descriptor, enables RSS hash */
@@ -3354,7 +3411,7 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
if (adapter->flags2 & IXGBE_FLAG2_RSS_FIELD_IPV6_UDP)
rss_field |= IXGBE_MRQC_RSS_FIELD_IPV6_UDP;
- netdev_rss_key_fill(rss_key, sizeof(rss_key));
+ netdev_rss_key_fill(adapter->rss_key, sizeof(adapter->rss_key));
if ((hw->mac.type >= ixgbe_mac_X550) &&
(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) {
unsigned int pf_pool = adapter->num_vfs;
@@ -3364,12 +3421,12 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
/* Setup RSS through the VF registers */
- ixgbe_setup_vfreta(adapter, rss_key);
+ ixgbe_setup_vfreta(adapter);
vfmrqc = IXGBE_MRQC_RSSEN;
vfmrqc |= rss_field;
IXGBE_WRITE_REG(hw, IXGBE_PFVFMRQC(pf_pool), vfmrqc);
} else {
- ixgbe_setup_reta(adapter, rss_key);
+ ixgbe_setup_reta(adapter);
mrqc |= rss_field;
IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
}
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index c3ddc94..0c671b1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -311,6 +311,13 @@ struct ixgbe_thermal_sensor_data {
#define IXGBE_ERETA(_i) (0x0EE80 + ((_i) * 4)) /* 96 of these (0-95) */
#define IXGBE_RSSRK(_i) (0x05C80 + ((_i) * 4)) /* 10 of these (0-9) */
+/* maximum number of RETA entries among all devices supported by ixgbe
+ * driver: currently it's x550 device in non-SRIOV mode
+ */
+#define IXGBE_MAX_RETA_ENTRIES 512
+
+#define IXGBE_RSS_KEY_SIZE 40 /* size of RSS Hash Key in bytes */
+
/* Registers for setting up RSS on X550 with SRIOV
* _p - pool number (0..63)
* _i - index (0..10 for PFVFRSSRK, 0..15 for PFVFRETA)
--
2.1.0
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