svm: allow mq attachments at random offsets
Type: feature
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Ic373cd2c11272da539eb4b0db27227f36f2f9688
diff --git a/src/svm/message_queue.h b/src/svm/message_queue.h
index 50f79fb..4b314b8 100644
--- a/src/svm/message_queue.h
+++ b/src/svm/message_queue.h
@@ -24,16 +24,30 @@
#include <vppinfra/error.h>
#include <svm/queue.h>
-typedef struct svm_msg_q_ring_
+typedef struct svm_msg_q_ring_shared_
{
volatile u32 cursize; /**< current size of the ring */
u32 nitems; /**< max size of the ring */
volatile u32 head; /**< current head (for dequeue) */
volatile u32 tail; /**< current tail (for enqueue) */
u32 elsize; /**< size of an element */
- u8 *data; /**< chunk of memory for msg data */
+ u8 data[0]; /**< chunk of memory for msg data */
+} svm_msg_q_ring_shared_t;
+
+typedef struct svm_msg_q_ring_
+{
+ u32 nitems; /**< max size of the ring */
+ u32 elsize; /**< size of an element */
+ svm_msg_q_ring_shared_t *shr; /**< ring in shared memory */
} __clib_packed svm_msg_q_ring_t;
+typedef struct svm_msg_q_shared_
+{
+ u32 n_rings; /**< number of rings after q */
+ u32 pad; /**< 8 byte alignment for q */
+ svm_queue_t q[0]; /**< queue for exchanging messages */
+} __clib_packed svm_msg_q_shared_t;
+
typedef struct svm_msg_q_
{
svm_queue_t *q; /**< queue for exchanging messages */
@@ -77,10 +91,12 @@
* ring configs
* @return message queue
*/
-svm_msg_q_t *svm_msg_q_alloc (svm_msg_q_cfg_t * cfg);
-svm_msg_q_t *svm_msg_q_init (void *base, svm_msg_q_cfg_t *cfg);
+svm_msg_q_shared_t *svm_msg_q_alloc (svm_msg_q_cfg_t *cfg);
+svm_msg_q_shared_t *svm_msg_q_init (void *base, svm_msg_q_cfg_t *cfg);
uword svm_msg_q_size_to_alloc (svm_msg_q_cfg_t *cfg);
+void svm_msg_q_attach (svm_msg_q_t *mq, void *smq_base);
+
/**
* Free message queue
*
@@ -267,8 +283,8 @@
static inline u8
svm_msg_q_ring_is_full (svm_msg_q_t * mq, u32 ring_index)
{
- ASSERT (ring_index < vec_len (mq->rings));
- return (mq->rings[ring_index].cursize == mq->rings[ring_index].nitems);
+ svm_msg_q_ring_t *ring = vec_elt_at_index (mq->rings, ring_index);
+ return (ring->shr->cursize >= ring->nitems);
}
/**