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From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v2 11/13] mbuf: move l2_len and l3_len to second cache line
Date: Thu, 11 Sep 2014 14:15:45 +0100
Message-ID: <1410441347-22840-12-git-send-email-bruce.richardson@intel.com> (raw)
In-Reply-To: <1410441347-22840-1-git-send-email-bruce.richardson@intel.com>

The l2_len and l3_len fields are used for TX offloads and so should be
put on the second cache line, along with the other fields only used on
TX.

Updates in V2:
* The l2 and l3 lengths can be accessed as a single uint16_t for
  performance, as well as individually.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_mbuf/rte_mbuf.h | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 508021b..1c6e115 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -159,13 +159,7 @@ struct rte_mbuf {
 	uint16_t reserved2;       /**< Unused field. Required for padding */
 	uint16_t data_len;        /**< Amount of data in segment buffer. */
 	uint32_t pkt_len;         /**< Total pkt len: sum of all segments. */
-	union {
-		uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
-		struct {
-			uint16_t l3_len:9;      /**< L3 (IP) Header Length. */
-			uint16_t l2_len:7;      /**< L2 (MAC) Header Length. */
-		};
-	};
+	uint16_t reserved;
 	uint16_t vlan_tci;        /**< VLAN Tag Control Identifier (CPU order) */
 	union {
 		uint32_t rss;     /**< RSS hash result if RSS enabled */
@@ -181,6 +175,14 @@ struct rte_mbuf {
 	struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
 	struct rte_mbuf *next;    /**< Next segment of scattered packet. */
 
+	/* fields to support TX offloads */
+	union {
+		uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
+		struct {
+			uint16_t l3_len:9;      /**< L3 (IP) Header Length. */
+			uint16_t l2_len:7;      /**< L2 (MAC) Header Length. */
+		};
+	};
 } __rte_cache_aligned;
 
 /**
-- 
1.9.3

  parent reply	other threads:[~2014-09-11 13:11 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-03 15:49 [dpdk-dev] [PATCH 00/13] Mbuf Structure Rework, part 2 Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 01/13] mbuf: replace data pointer by an offset Bruce Richardson
2014-09-08  9:52   ` Olivier MATZ
2014-09-08  9:55     ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 02/13] mbuf: reorder fields by time of use Bruce Richardson
2014-09-08 10:17   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 03/13] mbuf: add packet_type field Bruce Richardson
2014-09-08 10:17   ` Olivier MATZ
2014-09-08 10:33     ` Yerden Zhumabekov
2014-09-08 11:17       ` Olivier MATZ
2014-09-09  3:59         ` Zhang, Helin
     [not found]           ` <540EB428.9060706@6wind.com>
2014-09-09  8:45             ` Zhang, Helin
2014-09-09  9:47             ` Richardson, Bruce
2014-09-09 15:05         ` Jim Thompson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 04/13] mbuf: expand ol_flags field to 64-bits Bruce Richardson
2014-09-08 10:25   ` Olivier MATZ
2014-09-09  9:00     ` Richardson, Bruce
2014-09-03 15:49 ` [dpdk-dev] [PATCH 05/13] mbuf: introduce a flag to indicate a control mbuf Bruce Richardson
2014-09-08 11:53   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 06/13] mbuf: minor changes for readability Bruce Richardson
2014-09-08 12:03   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 07/13] mbuf: use macros only to access the mbuf metadata Bruce Richardson
2014-09-08 12:05   ` Olivier MATZ
2014-09-09  9:01     ` Richardson, Bruce
2014-09-12 16:56       ` Dumitrescu, Cristian
2014-09-12 21:02         ` Olivier MATZ
2014-09-16 20:07           ` Dumitrescu, Cristian
2014-09-16 22:06             ` Ramia, Kannan Babu
2014-09-17 10:31               ` Richardson, Bruce
2014-09-17 14:01                 ` Thomas Monjalon
2014-09-10 15:09     ` Bruce Richardson
2014-09-10 15:31       ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 08/13] mbuf: add named points inside the mbuf structure Bruce Richardson
2014-09-08 12:08   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 09/13] ixgbe: rework vector pmd following mbuf changes Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 10/13] mbuf: split mbuf across two cache lines Bruce Richardson
2014-09-08 12:10   ` Olivier MATZ
2014-09-03 15:49 ` [dpdk-dev] [PATCH 11/13] mbuf: move l2_len and l3_len to second cache line Bruce Richardson
2014-09-04  5:08   ` Yerden Zhumabekov
2014-09-04 10:27     ` Bruce Richardson
2014-09-04 11:00       ` Yerden Zhumabekov
2014-09-04 11:55         ` Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 12/13] ixgbe: Fix perf regression due to moved pool ptr Bruce Richardson
2014-09-03 15:49 ` [dpdk-dev] [PATCH 13/13] ixgbe: Improve slow-path perf: vector scattered RX Bruce Richardson
2014-09-11 13:15 ` [dpdk-dev] [PATCH v2 00/13] Mbuf Structure Rework, part 2 Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 01/13] mbuf: replace data pointer by an offset Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 02/13] mbuf: reorder fields by time of use Bruce Richardson
2014-09-15  7:11     ` Liu, Jijiang
2014-09-15  8:19       ` Richardson, Bruce
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 03/13] mbuf: expand ol_flags field to 64-bits Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 04/13] mbuf: introduce a flag to indicate a control mbuf Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 05/13] mbuf: minor changes for readability Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 06/13] mbuf: use macros only to access the mbuf metadata Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 07/13] mbuf: move metadata macros to rte_port library Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 08/13] mbuf: add named points inside the mbuf structure Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 09/13] ixgbe: rework vector pmd following mbuf changes Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 10/13] mbuf: split mbuf across two cache lines Bruce Richardson
2014-09-11 13:15   ` Bruce Richardson [this message]
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 12/13] ixgbe: Fix perf regression due to moved pool ptr Bruce Richardson
2014-09-15 16:20     ` [dpdk-dev] [PATCH v3 " Bruce Richardson
2014-09-11 13:15   ` [dpdk-dev] [PATCH v2 13/13] ixgbe: Improve slow-path perf: vector scattered RX Bruce Richardson
2014-09-17 22:35   ` [dpdk-dev] [PATCH v2 00/13] Mbuf Structure Rework, part 2 Thomas Monjalon

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