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leftover from r245579... flags for semi transparent mode and direct

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forwarding through a VALE switch
This commit is contained in:
Luigi Rizzo 2013-01-23 03:49:48 +00:00
parent e4573a9a7b
commit 01c039a19c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=245834
1 changed files with 41 additions and 8 deletions
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49
sys/net/netmap.h
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@ -32,7 +32,7 @@
/*
* $FreeBSD$
* $Id: netmap.h 10601 2012-02-21 16:40:14Z luigi $
* $Id: netmap.h 11997 2013-01-17 21:59:12Z luigi $
*
* Definitions of constants and the structures used by the netmap
* framework, for the part visible to both kernel and userspace.
@ -113,15 +113,28 @@
* In the kernel, buffers do not necessarily need to be contiguous,
* and the virtual and physical addresses are derived through
* a lookup table.
* To associate a different buffer to a slot, applications must
* write the new index in buf_idx, and set NS_BUF_CHANGED flag to
* make sure that the kernel updates the hardware ring as needed.
*
* Normally the driver is not requested to report the result of
* transmissions (this can dramatically speed up operation).
* However the user may request to report completion by setting
* NS_REPORT.
* struct netmap_slot:
*
* buf_idx is the index of the buffer associated to the slot.
* len is the length of the payload
* NS_BUF_CHANGED must be set whenever userspace wants
* to change buf_idx (it might be necessary to
* reprogram the NIC slot)
* NS_REPORT must be set if we want the NIC to generate an interrupt
* when this slot is used. Leaving it to 0 improves
* performance.
* NS_FORWARD if set on a receive ring, and the device is in
* transparent mode, buffers released with the flag set
* will be forwarded to the 'other' side (host stack
* or NIC, respectively) on the next select() or ioctl()
* NS_NO_LEARN on a VALE switch, do not 'learn' the source port for
* this packet.
* NS_PORT_MASK the high 8 bits of the flag, if not zero, indicate the
* destination port for the VALE switch, overriding
* the lookup table.
*/
struct netmap_slot {
uint32_t buf_idx; /* buffer index */
uint16_t len; /* packet length, to be copied to/from the hw ring */
@ -130,6 +143,12 @@ struct netmap_slot {
#define NS_REPORT 0x0002 /* ask the hardware to report results
* e.g. by generating an interrupt
*/
#define NS_FORWARD 0x0004 /* pass packet to the other endpoint
* (host stack or device)
*/
#define NS_NO_LEARN 0x0008
#define NS_PORT_SHIFT 8
#define NS_PORT_MASK (0xff << NS_PORT_SHIFT)
};
/*
@ -186,6 +205,18 @@ struct netmap_slot {
* a system call.
*
* The netmap_kring is only modified by the upper half of the kernel.
*
* FLAGS
* NR_TIMESTAMP updates the 'ts' field on each syscall. This is
* a global timestamp for all packets.
* NR_RX_TSTMP if set, the last 64 byte in each buffer will
* contain a timestamp for the frame supplied by
* the hardware (if supported)
* NR_FORWARD if set, the NS_FORWARD flag in each slot of the
* RX ring is checked, and if set the packet is
* passed to the other side (host stack or device,
* respectively). This permits bpf-like behaviour
* or transparency for selected packets.
*/
struct netmap_ring {
/*
@ -202,6 +233,8 @@ struct netmap_ring {
const uint16_t nr_buf_size;
uint16_t flags;
#define NR_TIMESTAMP 0x0002 /* set timestamp on *sync() */
#define NR_FORWARD 0x0004 /* enable NS_FORWARD for ring */
#define NR_RX_TSTMP 0x0008 /* set rx timestamp in slots */
struct timeval ts; /* time of last *sync() */