[dpdk-dev] [PATCH v2 10/10] sched: allow more subports

[Stephen Hemminger <stephen@networkplumber.org>]

From: Stephen Hemminger <shemming@brocade.com>

Increase the number of possible subports per port to allow up to 16 bits.
It is still possible that this will require excessive RAM.

Although mbuf structure is changed, it is ABI compatiable since it
just expands existing sched part of structure to overlap pre-existing hole
in the hash element of structure.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_mbuf/rte_mbuf.h   |  5 ++++-
 lib/librte_sched/rte_sched.c | 14 +++++++++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 4a93189..2dfcfef 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -799,7 +799,10 @@ struct rte_mbuf {
 			/**< First 4 flexible bytes or FD ID, dependent on
 			     PKT_RX_FDIR_* flag in ol_flags. */
 		} fdir;           /**< Filter identifier if FDIR enabled */
-		uint32_t sched;   /**< Hierarchical scheduler */
+		struct {
+			uint32_t lo;
+			uint32_t hi;
+		} sched;     	  /**< Hierarchical scheduler */
 		uint32_t usr;	  /**< User defined tags. See rte_distributor_process() */
 	} hash;                   /**< hash information */
 
diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index ff47198..dd3b8ba 100644
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -152,11 +152,12 @@ enum grinder_state {
  * by scheduler enqueue.
  */
 struct rte_sched_port_hierarchy {
-	uint32_t queue:2;                /**< Queue ID (0 .. 3) */
-	uint32_t traffic_class:2;        /**< Traffic class ID (0 .. 3)*/
-	uint32_t pipe:20;                /**< Pipe ID */
-	uint32_t subport:6;              /**< Subport ID */
+	uint16_t queue:2;                /**< Queue ID (0 .. 3) */
+	uint16_t traffic_class:2;        /**< Traffic class ID (0 .. 3)*/
 	uint32_t color:2;                /**< Color */
+	uint16_t unused:10;
+	uint16_t subport;              	 /**< Subport ID */
+	uint32_t pipe;		         /**< Pipe ID */
 };
 
 struct rte_sched_grinder {
@@ -292,8 +293,9 @@ rte_sched_port_check_params(struct rte_sched_port_params *params)
 	if (params->mtu == 0)
 		return -5;
 
-	/* n_subports_per_port: non-zero, power of 2 */
+	/* n_subports_per_port: non-zero, limited to 16 bits, power of 2 */
 	if (params->n_subports_per_port == 0 ||
+	    params->n_subports_per_port > 1u << 16 || 
 	    !rte_is_power_of_2(params->n_subports_per_port))
 		return -6;
 
@@ -916,6 +918,8 @@ rte_sched_port_pkt_write(struct rte_mbuf *pkt,
 	struct rte_sched_port_hierarchy *sched
 		= (struct rte_sched_port_hierarchy *) &pkt->hash.sched;
 
+	RTE_BUILD_BUG_ON(sizeof(*sched) > sizeof(pkt->hash.sched));
+			 	
 	sched->color = (uint32_t) color;
 	sched->subport = subport;
 	sched->pipe = pipe;
-- 
2.1.4