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xen-netback: (re-)create a debugfs node for hash information

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It is useful to be able to see the hash configuration when running tests.
This patch adds a debugfs node for that purpose.

The original version of this patch (commit c0c64c1523) was reverted due
to build failures caused by a conflict with commit 0364a8824c
("xen-netback: switch to threaded irq for control ring"). This new version
of the patch is nearly identical to the original, the only difference
being that creation of the debugfs node is predicated on 'ctrl_irq' being
non-zero rather then the now non-existent 'ctrl_task'.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant
2016-10-10 09:30:53 +01:00
committed by David S. Miller
parent fa59b27c9d
commit a9339b8e13
3 changed files with 107 additions and 2 deletions
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37
drivers/net/xen-netback/xenbus.c
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@@ -165,7 +165,7 @@ xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count,
return count;
}
static int xenvif_dump_open(struct inode *inode, struct file *filp)
static int xenvif_io_ring_open(struct inode *inode, struct file *filp)
{
int ret;
void *queue = NULL;
@@ -179,13 +179,35 @@ static int xenvif_dump_open(struct inode *inode, struct file *filp)
static const struct file_operations xenvif_dbg_io_ring_ops_fops = {
.owner = THIS_MODULE,
.open = xenvif_dump_open,
.open = xenvif_io_ring_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = xenvif_write_io_ring,
};
static int xenvif_read_ctrl(struct seq_file *m, void *v)
{
struct xenvif *vif = m->private;
xenvif_dump_hash_info(vif, m);
return 0;
}
static int xenvif_ctrl_open(struct inode *inode, struct file *filp)
{
return single_open(filp, xenvif_read_ctrl, inode->i_private);
}
static const struct file_operations xenvif_dbg_ctrl_ops_fops = {
.owner = THIS_MODULE,
.open = xenvif_ctrl_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void xenvif_debugfs_addif(struct xenvif *vif)
{
struct dentry *pfile;
@@ -210,6 +232,17 @@ static void xenvif_debugfs_addif(struct xenvif *vif)
pr_warn("Creation of io_ring file returned %ld!\n",
PTR_ERR(pfile));
}
if (vif->ctrl_irq) {
pfile = debugfs_create_file("ctrl",
S_IRUSR,
vif->xenvif_dbg_root,
vif,
&xenvif_dbg_ctrl_ops_fops);
if (IS_ERR_OR_NULL(pfile))
pr_warn("Creation of ctrl file returned %ld!\n",
PTR_ERR(pfile));
}
} else
netdev_warn(vif->dev,
"Creation of vif debugfs dir returned %ld!\n",