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Date: Wed, 24 Dec 2008 14:32:01 -0800
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, jeff@...zik.org,
Alexander Duyck <alexander.h.duyck@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [NET-NEXT PATCH 2/2] igb: re-order queues to support cleaner use of
ivar on 82576
From: Alexander Duyck <alexander.h.duyck@...el.com>
The 82576 adapter orders the queues in pairs when virtualization is in use.
The queue ordering previously conflicted with the ordering when sr-iov was
enabled. This new ordering allows a PF to allocate 2 queues without using
any VF resources.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/igb/igb.h | 3 +
drivers/net/igb/igb_main.c | 115 +++++++++++++++++++++++++++++---------------
2 files changed, 79 insertions(+), 39 deletions(-)
diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index c906325..5a27825 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -159,7 +159,8 @@ struct igb_ring {
u16 itr_register;
u16 cpu;
- int queue_index;
+ u16 queue_index;
+ u16 reg_idx;
unsigned int total_bytes;
unsigned int total_packets;
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 4962cdf..9331e52 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -231,6 +231,40 @@ static void __exit igb_exit_module(void)
module_exit(igb_exit_module);
+#define Q_IDX_82576(i) (((i & 0x1) << 3) + (i >> 1))
+/**
+ * igb_cache_ring_register - Descriptor ring to register mapping
+ * @adapter: board private structure to initialize
+ *
+ * Once we know the feature-set enabled for the device, we'll cache
+ * the register offset the descriptor ring is assigned to.
+ **/
+static void igb_cache_ring_register(struct igb_adapter *adapter)
+{
+ int i;
+
+ switch (adapter->hw.mac.type) {
+ case e1000_82576:
+ /* The queues are allocated for virtualization such that VF 0
+ * is allocated queues 0 and 8, VF 1 queues 1 and 9, etc.
+ * In order to avoid collision we start at the first free queue
+ * and continue consuming queues in the same sequence
+ */
+ for (i = 0; i < adapter->num_rx_queues; i++)
+ adapter->rx_ring[i].reg_idx = Q_IDX_82576(i);
+ for (i = 0; i < adapter->num_tx_queues; i++)
+ adapter->tx_ring[i].reg_idx = Q_IDX_82576(i);
+ break;
+ case e1000_82575:
+ default:
+ for (i = 0; i < adapter->num_rx_queues; i++)
+ adapter->rx_ring[i].reg_idx = i;
+ for (i = 0; i < adapter->num_tx_queues; i++)
+ adapter->tx_ring[i].reg_idx = i;
+ break;
+ }
+}
+
/**
* igb_alloc_queues - Allocate memory for all rings
* @adapter: board private structure to initialize
@@ -272,6 +306,8 @@ static int igb_alloc_queues(struct igb_adapter *adapter)
/* set a default napi handler for each rx_ring */
netif_napi_add(adapter->netdev, &ring->napi, igb_poll, 64);
}
+
+ igb_cache_ring_register(adapter);
return 0;
}
@@ -312,36 +348,36 @@ static void igb_assign_vector(struct igb_adapter *adapter, int rx_queue,
array_wr32(E1000_MSIXBM(0), msix_vector, msixbm);
break;
case e1000_82576:
- /* The 82576 uses a table-based method for assigning vectors.
+ /* 82576 uses a table-based method for assigning vectors.
Each queue has a single entry in the table to which we write
a vector number along with a "valid" bit. Sadly, the layout
of the table is somewhat counterintuitive. */
if (rx_queue > IGB_N0_QUEUE) {
- index = (rx_queue & 0x7);
+ index = (rx_queue >> 1);
ivar = array_rd32(E1000_IVAR0, index);
- if (rx_queue < 8) {
- /* vector goes into low byte of register */
- ivar = ivar & 0xFFFFFF00;
- ivar |= msix_vector | E1000_IVAR_VALID;
- } else {
+ if (rx_queue & 0x1) {
/* vector goes into third byte of register */
ivar = ivar & 0xFF00FFFF;
ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
+ } else {
+ /* vector goes into low byte of register */
+ ivar = ivar & 0xFFFFFF00;
+ ivar |= msix_vector | E1000_IVAR_VALID;
}
adapter->rx_ring[rx_queue].eims_value= 1 << msix_vector;
array_wr32(E1000_IVAR0, index, ivar);
}
if (tx_queue > IGB_N0_QUEUE) {
- index = (tx_queue & 0x7);
+ index = (tx_queue >> 1);
ivar = array_rd32(E1000_IVAR0, index);
- if (tx_queue < 8) {
- /* vector goes into second byte of register */
- ivar = ivar & 0xFFFF00FF;
- ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
- } else {
+ if (tx_queue & 0x1) {
/* vector goes into high byte of register */
ivar = ivar & 0x00FFFFFF;
ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
+ } else {
+ /* vector goes into second byte of register */
+ ivar = ivar & 0xFFFF00FF;
+ ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
}
adapter->tx_ring[tx_queue].eims_value= 1 << msix_vector;
array_wr32(E1000_IVAR0, index, ivar);
@@ -1638,33 +1674,33 @@ static void igb_configure_tx(struct igb_adapter *adapter)
struct e1000_hw *hw = &adapter->hw;
u32 tctl;
u32 txdctl, txctrl;
- int i;
+ int i, j;
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igb_ring *ring = &(adapter->tx_ring[i]);
-
- wr32(E1000_TDLEN(i),
+ j = ring->reg_idx;
+ wr32(E1000_TDLEN(j),
ring->count * sizeof(struct e1000_tx_desc));
tdba = ring->dma;
- wr32(E1000_TDBAL(i),
+ wr32(E1000_TDBAL(j),
tdba & 0x00000000ffffffffULL);
- wr32(E1000_TDBAH(i), tdba >> 32);
+ wr32(E1000_TDBAH(j), tdba >> 32);
- ring->head = E1000_TDH(i);
- ring->tail = E1000_TDT(i);
+ ring->head = E1000_TDH(j);
+ ring->tail = E1000_TDT(j);
writel(0, hw->hw_addr + ring->tail);
writel(0, hw->hw_addr + ring->head);
- txdctl = rd32(E1000_TXDCTL(i));
+ txdctl = rd32(E1000_TXDCTL(j));
txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
- wr32(E1000_TXDCTL(i), txdctl);
+ wr32(E1000_TXDCTL(j), txdctl);
/* Turn off Relaxed Ordering on head write-backs. The
* writebacks MUST be delivered in order or it will
* completely screw up our bookeeping.
*/
- txctrl = rd32(E1000_DCA_TXCTRL(i));
+ txctrl = rd32(E1000_DCA_TXCTRL(j));
txctrl &= ~E1000_DCA_TXCTRL_TX_WB_RO_EN;
- wr32(E1000_DCA_TXCTRL(i), txctrl);
+ wr32(E1000_DCA_TXCTRL(j), txctrl);
}
@@ -1781,7 +1817,7 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
struct e1000_hw *hw = &adapter->hw;
u32 rctl;
u32 srrctl = 0;
- int i;
+ int i, j;
rctl = rd32(E1000_RCTL);
@@ -1839,8 +1875,10 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
}
- for (i = 0; i < adapter->num_rx_queues; i++)
- wr32(E1000_SRRCTL(i), srrctl);
+ for (i = 0; i < adapter->num_rx_queues; i++) {
+ j = adapter->rx_ring[i].reg_idx;
+ wr32(E1000_SRRCTL(j), srrctl);
+ }
wr32(E1000_RCTL, rctl);
}
@@ -1857,7 +1895,7 @@ static void igb_configure_rx(struct igb_adapter *adapter)
struct e1000_hw *hw = &adapter->hw;
u32 rctl, rxcsum;
u32 rxdctl;
- int i;
+ int i, j;
/* disable receives while setting up the descriptors */
rctl = rd32(E1000_RCTL);
@@ -1872,25 +1910,26 @@ static void igb_configure_rx(struct igb_adapter *adapter)
* the Base and Length of the Rx Descriptor Ring */
for (i = 0; i < adapter->num_rx_queues; i++) {
struct igb_ring *ring = &(adapter->rx_ring[i]);
+ j = ring->reg_idx;
rdba = ring->dma;
- wr32(E1000_RDBAL(i),
+ wr32(E1000_RDBAL(j),
rdba & 0x00000000ffffffffULL);
- wr32(E1000_RDBAH(i), rdba >> 32);
- wr32(E1000_RDLEN(i),
+ wr32(E1000_RDBAH(j), rdba >> 32);
+ wr32(E1000_RDLEN(j),
ring->count * sizeof(union e1000_adv_rx_desc));
- ring->head = E1000_RDH(i);
- ring->tail = E1000_RDT(i);
+ ring->head = E1000_RDH(j);
+ ring->tail = E1000_RDT(j);
writel(0, hw->hw_addr + ring->tail);
writel(0, hw->hw_addr + ring->head);
- rxdctl = rd32(E1000_RXDCTL(i));
+ rxdctl = rd32(E1000_RXDCTL(j));
rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
rxdctl &= 0xFFF00000;
rxdctl |= IGB_RX_PTHRESH;
rxdctl |= IGB_RX_HTHRESH << 8;
rxdctl |= IGB_RX_WTHRESH << 16;
- wr32(E1000_RXDCTL(i), rxdctl);
+ wr32(E1000_RXDCTL(j), rxdctl);
#ifdef CONFIG_IGB_LRO
/* Intitial LRO Settings */
ring->lro_mgr.max_aggr = MAX_LRO_AGGR;
@@ -1920,7 +1959,7 @@ static void igb_configure_rx(struct igb_adapter *adapter)
shift = 6;
for (j = 0; j < (32 * 4); j++) {
reta.bytes[j & 3] =
- (j % adapter->num_rx_queues) << shift;
+ adapter->rx_ring[(j % adapter->num_rx_queues)].reg_idx << shift;
if ((j & 3) == 3)
writel(reta.dword,
hw->hw_addr + E1000_RETA(0) + (j & ~3));
@@ -3365,7 +3404,7 @@ static void igb_update_rx_dca(struct igb_ring *rx_ring)
struct igb_adapter *adapter = rx_ring->adapter;
struct e1000_hw *hw = &adapter->hw;
int cpu = get_cpu();
- int q = rx_ring - adapter->rx_ring;
+ int q = rx_ring->reg_idx;
if (rx_ring->cpu != cpu) {
dca_rxctrl = rd32(E1000_DCA_RXCTRL(q));
@@ -3392,7 +3431,7 @@ static void igb_update_tx_dca(struct igb_ring *tx_ring)
struct igb_adapter *adapter = tx_ring->adapter;
struct e1000_hw *hw = &adapter->hw;
int cpu = get_cpu();
- int q = tx_ring - adapter->tx_ring;
+ int q = tx_ring->reg_idx;
if (tx_ring->cpu != cpu) {
dca_txctrl = rd32(E1000_DCA_TXCTRL(q));
--
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