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memif: add private header size field

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private header size allows to reserve firs X bytes of payload to be
considered as private metadata. For now we just support value 0
but adding this field to address future needs without changing protocol
version.

Change-Id: Id77336584c0194a303b20210aff584c7372cba01
Signed-off-by: Damjan Marion <damarion@cisco.com>
This commit is contained in:
Damjan Marion
2018-03-27 15:02:56 +02:00
committed by Damjan Marion
parent 18c0f229ce
commit d50c987ead
2 changed files with 5 additions and 0 deletions
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1
src/plugins/memif/memif.h
View File

@ -103,6 +103,7 @@ typedef struct __attribute__ ((packed))
memif_region_index_t region;
memif_region_offset_t offset;
memif_log2_ring_size_t log2_ring_size;
uint16_t private_hdr_size; /* used for private metadata */
} memif_msg_add_ring_t;
typedef struct __attribute__ ((packed))

4
src/plugins/memif/socket.c
View File

@ -153,6 +153,7 @@ memif_msg_enq_add_ring (memif_if_t * mif, u8 index, u8 direction)
ar->offset = mq->offset;
ar->log2_ring_size = mq->log2_ring_size;
ar->flags = (direction == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0;
ar->private_hdr_size = 0;
}
static void
@ -326,6 +327,9 @@ memif_msg_receive_add_ring (memif_if_t * mif, memif_msg_t * msg, int fd)
if (fd < 0)
return clib_error_return (0, "missing ring interrupt fd");
if (ar->private_hdr_size != 0)
return clib_error_return (0, "private headers not supported");
if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M)
{
if (ar->index != vec_len (mif->rx_queues))