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USB: add binary API to usbmon

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This patch adds a new, "binary" API in addition to the old, text API usbmon
had before. The new API allows for less CPU use, and it allows to capture
all data from a packet where old API only captured 32 bytes at most. There
are some limitations and conditions to this, e.g. in case someone constructs
a URB with 1GB of data, it's not likely to be captured, because even the
huge buffers of the new reader are finite. Nonetheless, I expect this new
capability to capture all data for all real life scenarios.

The downside is, a special user mode application is required where cat(1)
worked before. I have sample code at http://people.redhat.com/zaitcev/linux/
and Paolo Abeni is working on patching libpcap.

This patch was initially written by Paolo and later I tweaked it, and
we had a little back-and-forth. So this is a jointly authored patch, but
I am submitting this I am responsible for the bugs.

Signed-off-by: Paolo Abeni <paolo.abeni@email.it>
Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev
2006-12-30 22:43:10 -08:00
committed by Greg Kroah-Hartman
parent a8ef36bc0a
commit 6f23ee1fef
7 changed files with 1502 additions and 57 deletions
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39
drivers/usb/mon/mon_dma.c
View File

@@ -48,6 +48,36 @@ char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len)
local_irq_restore(flags);
return 0;
}
void mon_dmapeek_vec(const struct mon_reader_bin *rp,
unsigned int offset, dma_addr_t dma_addr, unsigned int length)
{
unsigned long flags;
unsigned int step_len;
struct page *pg;
unsigned char *map;
unsigned long page_off, page_len;
local_irq_save(flags);
while (length) {
/* compute number of bytes we are going to copy in this page */
step_len = length;
page_off = dma_addr & (PAGE_SIZE-1);
page_len = PAGE_SIZE - page_off;
if (page_len < step_len)
step_len = page_len;
/* copy data and advance pointers */
pg = phys_to_page(dma_addr);
map = kmap_atomic(pg, KM_IRQ0);
offset = mon_copy_to_buff(rp, offset, map + page_off, step_len);
kunmap_atomic(map, KM_IRQ0);
dma_addr += step_len;
length -= step_len;
}
local_irq_restore(flags);
}
#endif /* __i386__ */
#ifndef MON_HAS_UNMAP
@@ -55,4 +85,11 @@ char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len)
{
return 'D';
}
#endif
void mon_dmapeek_vec(const struct mon_reader_bin *rp,
unsigned int offset, dma_addr_t dma_addr, unsigned int length)
{
;
}
#endif /* MON_HAS_UNMAP */