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Date: Wed, 19 Aug 2009 14:42:28 -0700
From: Roland Dreier <rdreier@...co.com>
To: Christoph Lameter <cl@...ux-foundation.org>
Cc: netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Subject: Re: mlx4 2.6.31-rc5: SW2HW_EQ failed.
I took another look at the patch I sent and found a couple of bugs in it
(seems original authors didn't really test on a system with 32 CPUs).
Anyway the patch below seems to work on a test system with 32 possible
CPUs (including unloading).
Let me know how it works for you.
Thanks,
Roland
commit 75e8522a04e982623d67b959d2e545974f36c323
Author: Eli Cohen <eli@...lanox.co.il>
Date: Wed Aug 19 14:15:59 2009 -0700
mlx4_core: Allocate and map sufficient ICM memory for EQ context
The current implementation allocates a single host page for EQ context
memory, which was OK when we only allocated a few EQs. However, since
we now allocate an EQ for each CPU core, this patch removes the
hard-coded limit and makes the allocation depend on EQ entry size and
the number of required EQs.
Signed-off-by: Eli Cohen <eli@...lanox.co.il>
Signed-off-by: Roland Dreier <rolandd@...co.com>
diff --git a/drivers/net/mlx4/eq.c b/drivers/net/mlx4/eq.c
index c11a052..fffe1ea 100644
--- a/drivers/net/mlx4/eq.c
+++ b/drivers/net/mlx4/eq.c
@@ -529,31 +529,46 @@ int mlx4_map_eq_icm(struct mlx4_dev *dev, u64 icm_virt)
{
struct mlx4_priv *priv = mlx4_priv(dev);
int ret;
+ int host_pages;
+ unsigned off;
- /*
- * We assume that mapping one page is enough for the whole EQ
- * context table. This is fine with all current HCAs, because
- * we only use 32 EQs and each EQ uses 64 bytes of context
- * memory, or 1 KB total.
- */
+ host_pages = PAGE_ALIGN(min_t(int, dev->caps.num_eqs, num_possible_cpus() + 1) *
+ dev->caps.eqc_entry_size) >> PAGE_SHIFT;
+ priv->eq_table.order = order_base_2(host_pages);
priv->eq_table.icm_virt = icm_virt;
- priv->eq_table.icm_page = alloc_page(GFP_HIGHUSER);
- if (!priv->eq_table.icm_page)
- return -ENOMEM;
+ priv->eq_table.icm_page = alloc_pages(GFP_HIGHUSER, priv->eq_table.order);
+ if (!priv->eq_table.icm_page) {
+ ret = -ENOMEM;
+ goto err;
+ }
priv->eq_table.icm_dma = pci_map_page(dev->pdev, priv->eq_table.icm_page, 0,
- PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ PAGE_SIZE << priv->eq_table.order,
+ PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(dev->pdev, priv->eq_table.icm_dma)) {
- __free_page(priv->eq_table.icm_page);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_free;
}
- ret = mlx4_MAP_ICM_page(dev, priv->eq_table.icm_dma, icm_virt);
- if (ret) {
- pci_unmap_page(dev->pdev, priv->eq_table.icm_dma, PAGE_SIZE,
- PCI_DMA_BIDIRECTIONAL);
- __free_page(priv->eq_table.icm_page);
+ for (off = 0; off < PAGE_SIZE << priv->eq_table.order; off += MLX4_ICM_PAGE_SIZE) {
+ ret = mlx4_MAP_ICM_page(dev, priv->eq_table.icm_dma + off,
+ icm_virt + off);
+ if (ret)
+ goto err_unmap;
}
+ return 0;
+
+err_unmap:
+ if (off)
+ mlx4_UNMAP_ICM(dev, priv->eq_table.icm_virt, off / MLX4_ICM_PAGE_SIZE);
+ pci_unmap_page(dev->pdev, priv->eq_table.icm_dma,
+ PAGE_SIZE << priv->eq_table.order,
+ PCI_DMA_BIDIRECTIONAL);
+
+err_free:
+ __free_pages(priv->eq_table.icm_page, priv->eq_table.order);
+
+err:
return ret;
}
@@ -561,10 +576,11 @@ void mlx4_unmap_eq_icm(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
- mlx4_UNMAP_ICM(dev, priv->eq_table.icm_virt, 1);
- pci_unmap_page(dev->pdev, priv->eq_table.icm_dma, PAGE_SIZE,
- PCI_DMA_BIDIRECTIONAL);
- __free_page(priv->eq_table.icm_page);
+ mlx4_UNMAP_ICM(dev, priv->eq_table.icm_virt,
+ (PAGE_SIZE / MLX4_ICM_PAGE_SIZE) << priv->eq_table.order);
+ pci_unmap_page(dev->pdev, priv->eq_table.icm_dma,
+ PAGE_SIZE << priv->eq_table.order, PCI_DMA_BIDIRECTIONAL);
+ __free_pages(priv->eq_table.icm_page, priv->eq_table.order);
}
int mlx4_alloc_eq_table(struct mlx4_dev *dev)
diff --git a/drivers/net/mlx4/main.c b/drivers/net/mlx4/main.c
index 5c1afe0..474d1f3 100644
--- a/drivers/net/mlx4/main.c
+++ b/drivers/net/mlx4/main.c
@@ -207,6 +207,7 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
dev->caps.max_cqes = dev_cap->max_cq_sz - 1;
dev->caps.reserved_cqs = dev_cap->reserved_cqs;
dev->caps.reserved_eqs = dev_cap->reserved_eqs;
+ dev->caps.eqc_entry_size = dev_cap->eqc_entry_sz;
dev->caps.mtts_per_seg = 1 << log_mtts_per_seg;
dev->caps.reserved_mtts = DIV_ROUND_UP(dev_cap->reserved_mtts,
dev->caps.mtts_per_seg);
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index 5bd79c2..34bcc11 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -210,6 +210,7 @@ struct mlx4_eq_table {
dma_addr_t icm_dma;
struct mlx4_icm_table cmpt_table;
int have_irq;
+ int order;
u8 inta_pin;
};
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index ce7cc6c..8923c9b 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -206,6 +206,7 @@ struct mlx4_caps {
int max_cqes;
int reserved_cqs;
int num_eqs;
+ int eqc_entry_size;
int reserved_eqs;
int num_comp_vectors;
int num_mpts;
--
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