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igb: when number of CPUs > 4 combine tx/rx queues to allow more queues

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This patch makes it so that nics such as 82576 and newer can support more
hardware queues when there are more than 4 cpus by combining a tx/rx queue
pair onto one interrupt so that 8 queue pairs can be supported and thus
allow for more queues.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2009-11-12 18:37:19 +00:00
committed by David S. Miller
parent 115f459a53
commit a99955fc06
2 changed files with 27 additions and 13 deletions
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31
drivers/net/igb/igb_main.c
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@@ -296,10 +296,10 @@ static void igb_cache_ring_register(struct igb_adapter *adapter)
* and continue consuming queues in the same sequence
*/
if (adapter->vfs_allocated_count) {
for (; i < adapter->num_rx_queues; i++)
for (; i < adapter->rss_queues; i++)
adapter->rx_ring[i].reg_idx = rbase_offset +
Q_IDX_82576(i);
for (; j < adapter->num_tx_queues; j++)
for (; j < adapter->rss_queues; j++)
adapter->tx_ring[j].reg_idx = rbase_offset +
Q_IDX_82576(j);
}
@@ -618,14 +618,15 @@ static void igb_set_interrupt_capability(struct igb_adapter *adapter)
int numvecs, i;
/* Number of supported queues. */
adapter->num_rx_queues = min_t(u32, IGB_MAX_RX_QUEUES, num_online_cpus());
adapter->num_tx_queues = min_t(u32, IGB_MAX_TX_QUEUES, num_online_cpus());
adapter->num_rx_queues = adapter->rss_queues;
adapter->num_tx_queues = adapter->rss_queues;
/* start with one vector for every rx queue */
numvecs = adapter->num_rx_queues;
/* if tx handler is seperate add 1 for every tx queue */
numvecs += adapter->num_tx_queues;
if (!(adapter->flags & IGB_FLAG_QUEUE_PAIRS))
numvecs += adapter->num_tx_queues;
/* store the number of vectors reserved for queues */
adapter->num_q_vectors = numvecs;
@@ -666,6 +667,7 @@ msi_only:
}
#endif
adapter->vfs_allocated_count = 0;
adapter->rss_queues = 1;
adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
adapter->num_rx_queues = 1;
adapter->num_tx_queues = 1;
@@ -1824,6 +1826,17 @@ static int __devinit igb_sw_init(struct igb_adapter *adapter)
adapter->vfs_allocated_count = max_vfs;
#endif /* CONFIG_PCI_IOV */
adapter->rss_queues = min_t(u32, IGB_MAX_RX_QUEUES, num_online_cpus());
/*
* if rss_queues > 4 or vfs are going to be allocated with rss_queues
* then we should combine the queues into a queue pair in order to
* conserve interrupts due to limited supply
*/
if ((adapter->rss_queues > 4) ||
((adapter->rss_queues > 1) && (adapter->vfs_allocated_count > 6)))
adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
/* This call may decrease the number of queues */
if (igb_init_interrupt_scheme(adapter)) {
dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
@@ -2015,7 +2028,7 @@ static int igb_setup_all_tx_resources(struct igb_adapter *adapter)
}
}
for (i = 0; i < IGB_MAX_TX_QUEUES; i++) {
for (i = 0; i < IGB_ABS_MAX_TX_QUEUES; i++) {
int r_idx = i % adapter->num_tx_queues;
adapter->multi_tx_table[i] = &adapter->tx_ring[r_idx];
}
@@ -2199,7 +2212,7 @@ static void igb_setup_mrqc(struct igb_adapter *adapter)
array_wr32(E1000_RSSRK(0), j, rsskey);
}
num_rx_queues = adapter->num_rx_queues;
num_rx_queues = adapter->rss_queues;
if (adapter->vfs_allocated_count) {
/* 82575 and 82576 supports 2 RSS queues for VMDq */
@@ -2255,7 +2268,7 @@ static void igb_setup_mrqc(struct igb_adapter *adapter)
E1000_VT_CTL_DEFAULT_POOL_SHIFT;
wr32(E1000_VT_CTL, vtctl);
}
if (adapter->num_rx_queues > 1)
if (adapter->rss_queues > 1)
mrqc = E1000_MRQC_ENABLE_VMDQ_RSS_2Q;
else
mrqc = E1000_MRQC_ENABLE_VMDQ;
@@ -2385,7 +2398,7 @@ static inline void igb_set_vmolr(struct igb_adapter *adapter, int vfn)
/* clear all bits that might not be set */
vmolr &= ~(E1000_VMOLR_BAM | E1000_VMOLR_RSSE);
if (adapter->num_rx_queues > 1 && vfn == adapter->vfs_allocated_count)
if (adapter->rss_queues > 1 && vfn == adapter->vfs_allocated_count)
vmolr |= E1000_VMOLR_RSSE; /* enable RSS */
/*
* for VMDq only allow the VFs and pool 0 to accept broadcast and