[Xen-devel] [PATCH net-next] xen-netback: create a debugfs node for hash information

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

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@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 drivers/net/xen-netback/common.h |  4 +++
 drivers/net/xen-netback/hash.c   | 68 ++++++++++++++++++++++++++++++++++++++++
 drivers/net/xen-netback/xenbus.c | 37 ++++++++++++++++++++--
 3 files changed, 107 insertions(+), 2 deletions(-)

diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 84d6cbd..3a56268 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -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__ */
diff --git a/drivers/net/xen-netback/hash.c b/drivers/net/xen-netback/hash.c
index fb87cb3..282b16d 100644
--- a/drivers/net/xen-netback/hash.c
+++ b/drivers/net/xen-netback/hash.c
@@ -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)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 6a31f26..bacf6e0 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -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",
-- 
2.1.4


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