net/liquidio: add APIs for SG list

[dpdk.git] / drivers / net / liquidio / lio_struct.h

diff --git a/drivers/net/liquidio/lio_struct.h b/drivers/net/liquidio/lio_struct.h
index 7a7a4a6..4d67eb6 100644 (file)
--- a/drivers/net/liquidio/lio_struct.h
+++ b/drivers/net/liquidio/lio_struct.h
@@ -298,6 +298,41 @@ struct lio_instr_queue {
        const struct rte_memzone *iq_mz;
 };
 
+/* The Scatter-Gather List Entry. The scatter or gather component used with
+ * input instruction has this format.
+ */
+struct lio_sg_entry {
+       /** The first 64 bit gives the size of data in each dptr. */
+       union {
+               uint16_t size[4];
+               uint64_t size64;
+       } u;
+
+       /** The 4 dptr pointers for this entry. */
+       uint64_t ptr[4];
+};
+
+#define LIO_SG_ENTRY_SIZE      (sizeof(struct lio_sg_entry))
+
+/** Structure of a node in list of gather components maintained by
+ *  driver for each network device.
+ */
+struct lio_gather {
+       /** List manipulation. Next and prev pointers. */
+       struct lio_stailq_node list;
+
+       /** Size of the gather component at sg in bytes. */
+       int sg_size;
+
+       /** Number of bytes that sg was adjusted to make it 8B-aligned. */
+       int adjust;
+
+       /** Gather component that can accommodate max sized fragment list
+        *  received from the IP layer.
+        */
+       struct lio_sg_entry *sg;
+};
+
 struct lio_io_enable {
        uint64_t iq;
        uint64_t oq;
@@ -516,6 +551,11 @@ struct lio_device {
 
        uint32_t num_iqs;
 
+       /** Guards each glist */
+       rte_spinlock_t *glist_lock;
+       /** Array of gather component linked lists */
+       struct lio_stailq_head *glist_head;
+
        /* The pool containing pre allocated buffers used for soft commands */
        struct rte_mempool *sc_buf_pool;