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authorEvgeniy Polyakov <johnpol@2ka.mipt.ru>2007-11-10 20:24:18 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:12 +1100
commita1e6ef2f1e01f2aa9ed930e1089fc85dc745bf7a (patch)
treeb061de93924ff3d4804c04ea7ed85990bb3161b4 /drivers/crypto/hifn_795x.c
parentcd12fb906d2591e80da9edcbd4794b9b916d7489 (diff)
downloadlinux-linaro-stable-a1e6ef2f1e01f2aa9ed930e1089fc85dc745bf7a.tar.gz
[CRYPTO] hifn: Schedule callback invocation to tasklet.
This patch forces HIFN driver to invoke crypto request callbacks from tasklet (softirq context) instead of hardirq context, since network stack expects it to be called from bottom halves. It is done by simply scheduling callback invocation via dedicated tasklet. Workqueue solution was dropped because of tooo slow rescheduling performance (7 times slower than tasklet, for mode details one can check this link: http://tservice.net.ru/~s0mbre/blog/devel/other/2007_11_09.html). Driver passed all AES and DES tests in tcryt.c module. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/hifn_795x.c')
-rw-r--r--drivers/crypto/hifn_795x.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index 391c20a3dff8..7b7c85439c33 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -26,6 +26,7 @@
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/highmem.h>
+#include <linux/interrupt.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
@@ -426,6 +427,8 @@ struct hifn_device
u8 snum;
+ struct tasklet_struct tasklet;
+
struct crypto_queue queue;
struct list_head alg_list;
};
@@ -1879,7 +1882,7 @@ static irqreturn_t hifn_interrupt(int irq, void *data)
hifn_write_1(dev, HIFN_1_DMA_IER, dev->dmareg);
}
- hifn_check_for_completion(dev, 0);
+ tasklet_schedule(&dev->tasklet);
hifn_clear_rings(dev);
return IRQ_HANDLED;
@@ -2408,6 +2411,19 @@ err_out_exit:
return err;
}
+static void hifn_tasklet_callback(unsigned long data)
+{
+ struct hifn_device *dev = (struct hifn_device *)data;
+
+ /*
+ * This is ok to call this without lock being held,
+ * althogh it modifies some parameters used in parallel,
+ * (like dev->success), but they are used in process
+ * context or update is atomic (like setting dev->sa[i] to NULL).
+ */
+ hifn_check_for_completion(dev, 0);
+}
+
static int hifn_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
int err, i;
@@ -2489,6 +2505,8 @@ static int hifn_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, dev);
+ tasklet_init(&dev->tasklet, hifn_tasklet_callback, (unsigned long)dev);
+
crypto_init_queue(&dev->queue, 1);
err = request_irq(dev->irq, hifn_interrupt, IRQF_SHARED, dev->name, dev);
@@ -2524,6 +2542,7 @@ err_out_stop_device:
hifn_stop_device(dev);
err_out_free_irq:
free_irq(dev->irq, dev->name);
+ tasklet_kill(&dev->tasklet);
err_out_free_desc:
pci_free_consistent(pdev, sizeof(struct hifn_dma),
dev->desc_virt, dev->desc_dma);
@@ -2563,6 +2582,7 @@ static void hifn_remove(struct pci_dev *pdev)
hifn_stop_device(dev);
free_irq(dev->irq, dev->name);
+ tasklet_kill(&dev->tasklet);
hifn_flush(dev);