nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

xen: update ring.h

Browse source 
Update include/xen/interface/io/ring.h to its newest version.

Switch the two improper use cases of RING_HAS_UNCONSUMED_RESPONSES() to
XEN_RING_NR_UNCONSUMED_RESPONSES() in order to avoid the nasty
XEN_RING_HAS_UNCONSUMED_IS_BOOL #define.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-04-28 09:59:01 +02:00
parent 888fd787f3
commit 6fac592cca
2 changed files with 16 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/net/xen-netfront.c
View file

@ -866,7 +866,7 @@ static void xennet_set_rx_rsp_cons(struct netfront_queue *queue, RING_IDX val)
spin_lock_irqsave(&queue->rx_cons_lock, flags);
queue->rx.rsp_cons = val;
queue->rx_rsp_unconsumed = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx);
queue->rx_rsp_unconsumed = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx);
spin_unlock_irqrestore(&queue->rx_cons_lock, flags);
}
@ -1498,7 +1498,7 @@ static bool xennet_handle_rx(struct netfront_queue *queue, unsigned int *eoi)
return false;
spin_lock_irqsave(&queue->rx_cons_lock, flags);
work_queued = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx);
work_queued = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx);
if (work_queued > queue->rx_rsp_unconsumed) {
queue->rx_rsp_unconsumed = work_queued;
*eoi = 0;

19
include/xen/interface/io/ring.h
View file

@ -72,9 +72,8 @@ typedef unsigned int RING_IDX;
* of the shared memory area (PAGE_SIZE, for instance). To initialise
* the front half:
*
* mytag_front_ring_t front_ring;
* SHARED_RING_INIT((mytag_sring_t *)shared_page);
* FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
* mytag_front_ring_t ring;
* XEN_FRONT_RING_INIT(&ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
*
* Initializing the back follows similarly (note that only the front
* initializes the shared ring):
@ -146,6 +145,11 @@ struct __name##_back_ring { \
#define FRONT_RING_INIT(_r, _s, __size) FRONT_RING_ATTACH(_r, _s, 0, __size)
#define XEN_FRONT_RING_INIT(r, s, size) do { \
SHARED_RING_INIT(s); \
FRONT_RING_INIT(r, s, size); \
} while (0)
#define BACK_RING_ATTACH(_r, _s, _i, __size) do { \
(_r)->rsp_prod_pvt = (_i); \
(_r)->req_cons = (_i); \
@ -170,16 +174,21 @@ struct __name##_back_ring { \
(RING_FREE_REQUESTS(_r) == 0)
/* Test if there are outstanding messages to be processed on a ring. */
#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
#define XEN_RING_NR_UNCONSUMED_RESPONSES(_r) \
((_r)->sring->rsp_prod - (_r)->rsp_cons)
#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({ \
#define XEN_RING_NR_UNCONSUMED_REQUESTS(_r) ({ \
unsigned int req = (_r)->sring->req_prod - (_r)->req_cons; \
unsigned int rsp = RING_SIZE(_r) - \
((_r)->req_cons - (_r)->rsp_prod_pvt); \
req < rsp ? req : rsp; \
})
#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
(!!XEN_RING_NR_UNCONSUMED_RESPONSES(_r))
#define RING_HAS_UNCONSUMED_REQUESTS(_r) \
(!!XEN_RING_NR_UNCONSUMED_REQUESTS(_r))
/* Direct access to individual ring elements, by index. */
#define RING_GET_REQUEST(_r, _idx) \
(&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))