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xen-netback: 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.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant 2016-08-17 16:13:29 +01:00 committed by David S. Miller
parent c7b256f998
commit c0c64c1523
3 changed files with 107 additions and 2 deletions
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4
drivers/net/xen-netback/common.h
View file

@ -412,4 +412,8 @@ u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb);
#ifdef CONFIG_DEBUG_FS
void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m);
#endif
#endif /* __XEN_NETBACK__COMMON_H__ */

68
drivers/net/xen-netback/hash.c
View file

@ -369,6 +369,74 @@ u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
return XEN_NETIF_CTRL_STATUS_SUCCESS;
}
#ifdef CONFIG_DEBUG_FS
void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m)
{
unsigned int i;
switch (vif->hash.alg) {
case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ:
seq_puts(m, "Hash Algorithm: TOEPLITZ\n");
break;
case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE:
seq_puts(m, "Hash Algorithm: NONE\n");
/* FALLTHRU */
default:
return;
}
if (vif->hash.flags) {
seq_puts(m, "\nHash Flags:\n");
if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4)
seq_puts(m, "- IPv4\n");
if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP)
seq_puts(m, "- IPv4 + TCP\n");
if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6)
seq_puts(m, "- IPv6\n");
if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)
seq_puts(m, "- IPv6 + TCP\n");
}
seq_puts(m, "\nHash Key:\n");
for (i = 0; i < XEN_NETBK_MAX_HASH_KEY_SIZE; ) {
unsigned int j, n;
n = 8;
if (i + n >= XEN_NETBK_MAX_HASH_KEY_SIZE)
n = XEN_NETBK_MAX_HASH_KEY_SIZE - i;
seq_printf(m, "[%2u - %2u]: ", i, i + n - 1);
for (j = 0; j < n; j++, i++)
seq_printf(m, "%02x ", vif->hash.key[i]);
seq_puts(m, "\n");
}
if (vif->hash.size != 0) {
seq_puts(m, "\nHash Mapping:\n");
for (i = 0; i < vif->hash.size; ) {
unsigned int j, n;
n = 8;
if (i + n >= vif->hash.size)
n = vif->hash.size - i;
seq_printf(m, "[%4u - %4u]: ", i, i + n - 1);
for (j = 0; j < n; j++, i++)
seq_printf(m, "%4u ", vif->hash.mapping[i]);
seq_puts(m, "\n");
}
}
}
#endif /* CONFIG_DEBUG_FS */
void xenvif_init_hash(struct xenvif *vif)
{
if (xenvif_hash_cache_size == 0)

37
drivers/net/xen-netback/xenbus.c
View file

@ -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_task) {
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",