diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00debug.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00debug.c | 182 |
1 files changed, 181 insertions, 1 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c index 3aa7e0ab513..e72c98133c0 100644 --- a/drivers/net/wireless/rt2x00/rt2x00debug.c +++ b/drivers/net/wireless/rt2x00/rt2x00debug.c @@ -26,10 +26,12 @@ #include <linux/debugfs.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/poll.h> #include <linux/uaccess.h> #include "rt2x00.h" #include "rt2x00lib.h" +#include "rt2x00dump.h" #define PRINT_LINE_LEN_MAX 32 @@ -58,6 +60,8 @@ struct rt2x00debug_intf { * - eeprom offset/value files * - bbp offset/value files * - rf offset/value files + * - frame dump folder + * - frame dump file */ struct dentry *driver_folder; struct dentry *driver_entry; @@ -72,6 +76,24 @@ struct rt2x00debug_intf { struct dentry *bbp_val_entry; struct dentry *rf_off_entry; struct dentry *rf_val_entry; + struct dentry *frame_folder; + struct dentry *frame_dump_entry; + + /* + * The frame dump file only allows a single reader, + * so we need to store the current state here. + */ + unsigned long frame_dump_flags; +#define FRAME_DUMP_FILE_OPEN 1 + + /* + * We queue each frame before dumping it to the user, + * per read command we will pass a single skb structure + * so we should be prepared to queue multiple sk buffers + * before sending it to userspace. + */ + struct sk_buff_head frame_dump_skbqueue; + wait_queue_head_t frame_dump_waitqueue; /* * Driver and chipset files will use a data buffer @@ -90,6 +112,63 @@ struct rt2x00debug_intf { unsigned int offset_rf; }; +void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev, + struct sk_buff *skb) +{ + struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf; + struct skb_desc *desc = get_skb_desc(skb); + struct sk_buff *skbcopy; + struct rt2x00dump_hdr *dump_hdr; + struct timeval timestamp; + unsigned int ring_index; + unsigned int entry_index; + + do_gettimeofday(×tamp); + ring_index = ARRAY_INDEX(desc->ring, rt2x00dev->rx); + entry_index = ARRAY_INDEX(desc->entry, desc->ring->entry); + + if (!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)) + return; + + if (skb_queue_len(&intf->frame_dump_skbqueue) > 20) { + DEBUG(rt2x00dev, "txrx dump queue length exceeded.\n"); + return; + } + + skbcopy = alloc_skb(sizeof(*dump_hdr) + desc->desc_len + desc->data_len, + GFP_ATOMIC); + if (!skbcopy) { + DEBUG(rt2x00dev, "Failed to copy skb for dump.\n"); + return; + } + + dump_hdr = (struct rt2x00dump_hdr *)skb_put(skbcopy, sizeof(*dump_hdr)); + dump_hdr->version = cpu_to_le32(DUMP_HEADER_VERSION); + dump_hdr->header_length = cpu_to_le32(sizeof(*dump_hdr)); + dump_hdr->desc_length = cpu_to_le32(desc->desc_len); + dump_hdr->data_length = cpu_to_le32(desc->data_len); + dump_hdr->chip_rt = cpu_to_le16(rt2x00dev->chip.rt); + dump_hdr->chip_rf = cpu_to_le16(rt2x00dev->chip.rf); + dump_hdr->chip_rev = cpu_to_le32(rt2x00dev->chip.rev); + dump_hdr->type = cpu_to_le16(desc->frame_type); + dump_hdr->ring_index = ring_index; + dump_hdr->entry_index = entry_index; + dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec); + dump_hdr->timestamp_usec = cpu_to_le32(timestamp.tv_usec); + + memcpy(skb_put(skbcopy, desc->desc_len), desc->desc, desc->desc_len); + memcpy(skb_put(skbcopy, desc->data_len), desc->data, desc->data_len); + + skb_queue_tail(&intf->frame_dump_skbqueue, skbcopy); + wake_up_interruptible(&intf->frame_dump_waitqueue); + + /* + * Verify that the file has not been closed while we were working. + */ + if (!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)) + skb_queue_purge(&intf->frame_dump_skbqueue); +} + static int rt2x00debug_file_open(struct inode *inode, struct file *file) { struct rt2x00debug_intf *intf = inode->i_private; @@ -111,6 +190,89 @@ static int rt2x00debug_file_release(struct inode *inode, struct file *file) return 0; } +static int rt2x00debug_open_ring_dump(struct inode *inode, struct file *file) +{ + struct rt2x00debug_intf *intf = inode->i_private; + int retval; + + retval = rt2x00debug_file_open(inode, file); + if (retval) + return retval; + + if (test_and_set_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)) { + rt2x00debug_file_release(inode, file); + return -EBUSY; + } + + return 0; +} + +static int rt2x00debug_release_ring_dump(struct inode *inode, struct file *file) +{ + struct rt2x00debug_intf *intf = inode->i_private; + + skb_queue_purge(&intf->frame_dump_skbqueue); + + clear_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags); + + return rt2x00debug_file_release(inode, file); +} + +static ssize_t rt2x00debug_read_ring_dump(struct file *file, + char __user *buf, + size_t length, + loff_t *offset) +{ + struct rt2x00debug_intf *intf = file->private_data; + struct sk_buff *skb; + size_t status; + int retval; + + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + + retval = + wait_event_interruptible(intf->frame_dump_waitqueue, + (skb = + skb_dequeue(&intf->frame_dump_skbqueue))); + if (retval) + return retval; + + status = min((size_t)skb->len, length); + if (copy_to_user(buf, skb->data, status)) { + status = -EFAULT; + goto exit; + } + + *offset += status; + +exit: + kfree_skb(skb); + + return status; +} + +static unsigned int rt2x00debug_poll_ring_dump(struct file *file, + poll_table *wait) +{ + struct rt2x00debug_intf *intf = file->private_data; + + poll_wait(file, &intf->frame_dump_waitqueue, wait); + + if (!skb_queue_empty(&intf->frame_dump_skbqueue)) + return POLLOUT | POLLWRNORM; + + return 0; +} + +static const struct file_operations rt2x00debug_fop_ring_dump = { + .owner = THIS_MODULE, + .read = rt2x00debug_read_ring_dump, + .poll = rt2x00debug_poll_ring_dump, + .open = rt2x00debug_open_ring_dump, + .release = rt2x00debug_release_ring_dump, +}; + #define RT2X00DEBUGFS_OPS_READ(__name, __format, __type) \ static ssize_t rt2x00debug_read_##__name(struct file *file, \ char __user *buf, \ @@ -339,6 +501,20 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev) #undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY + intf->frame_folder = + debugfs_create_dir("frame", intf->driver_folder); + if (IS_ERR(intf->frame_folder)) + goto exit; + + intf->frame_dump_entry = + debugfs_create_file("dump", S_IRUGO, intf->frame_folder, + intf, &rt2x00debug_fop_ring_dump); + if (IS_ERR(intf->frame_dump_entry)) + goto exit; + + skb_queue_head_init(&intf->frame_dump_skbqueue); + init_waitqueue_head(&intf->frame_dump_waitqueue); + return; exit: @@ -350,11 +526,15 @@ exit: void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev) { - const struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf; + struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf; if (unlikely(!intf)) return; + skb_queue_purge(&intf->frame_dump_skbqueue); + + debugfs_remove(intf->frame_dump_entry); + debugfs_remove(intf->frame_folder); debugfs_remove(intf->rf_val_entry); debugfs_remove(intf->rf_off_entry); debugfs_remove(intf->bbp_val_entry); |