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-rw-r--r--dpdk/dpdk-16.04_patches/0004-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch83
1 files changed, 83 insertions, 0 deletions
diff --git a/dpdk/dpdk-16.04_patches/0004-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch b/dpdk/dpdk-16.04_patches/0004-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch
new file mode 100644
index 00000000000..78d0c637562
--- /dev/null
+++ b/dpdk/dpdk-16.04_patches/0004-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch
@@ -0,0 +1,83 @@
+From eed80f56477e26a5711ea3749d1881797b3c82a5 Mon Sep 17 00:00:00 2001
+From: Damjan Marion <damarion@cisco.com>
+Date: Wed, 16 Dec 2015 04:25:23 +0100
+Subject: [PATCH 4/6] mbuf: rearrange rte_mbuf metadata to suit vpp
+
+---
+ .../linuxapp/eal/include/exec-env/rte_kni_common.h | 5 +++--
+ lib/librte_mbuf/rte_mbuf.h | 20 ++++++++++++--------
+ 2 files changed, 15 insertions(+), 10 deletions(-)
+
+diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
+index 7e5e598..fdbeb4a 100644
+--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
++++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
+@@ -118,11 +118,12 @@ struct rte_kni_mbuf {
+ char pad2[4];
+ uint32_t pkt_len; /**< Total pkt len: sum of all segment data_len. */
+ uint16_t data_len; /**< Amount of data in segment buffer. */
++ char pad3[8];
++ void *next;
+
+ /* fields on second cache line */
+- char pad3[8] __attribute__((__aligned__(RTE_CACHE_LINE_MIN_SIZE)));
++ char pad4[16] __attribute__((__aligned__(RTE_CACHE_LINE_MIN_SIZE)));
+ void *pool;
+- void *next;
+ };
+
+ /*
+diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
+index 75a227d..ca4d0fb 100644
+--- a/lib/librte_mbuf/rte_mbuf.h
++++ b/lib/librte_mbuf/rte_mbuf.h
+@@ -731,6 +731,12 @@ typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
+ /**
+ * The generic rte_mbuf, containing a packet mbuf.
+ */
++/*
++ * offload in the second cache line, next in the first. Better for vpp
++ * at least as of right now.
++ * If you change this structure, you must change the user-mode
++ * version in rte_mbuf.h
++ */
+ struct rte_mbuf {
+ MARKER cacheline0;
+
+@@ -783,6 +789,12 @@ struct rte_mbuf {
+ uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
+ uint16_t data_len; /**< Amount of data in segment buffer. */
+ uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
++ uint32_t seqn; /**< Sequence number. See also rte_reorder_insert() */
++ uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
++ struct rte_mbuf *next; /**< Next segment of scattered packet. */
++
++ /* second cache line - fields only used in slow path or on TX */
++ MARKER cacheline1 __rte_cache_min_aligned;
+
+ union {
+ uint32_t rss; /**< RSS hash result if RSS enabled */
+@@ -806,20 +818,12 @@ struct rte_mbuf {
+ uint32_t usr; /**< User defined tags. See rte_distributor_process() */
+ } hash; /**< hash information */
+
+- uint32_t seqn; /**< Sequence number. See also rte_reorder_insert() */
+-
+- uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
+-
+- /* second cache line - fields only used in slow path or on TX */
+- MARKER cacheline1 __rte_cache_min_aligned;
+-
+ union {
+ void *userdata; /**< Can be used for external metadata */
+ uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
+ };
+
+ 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 {
+--
+2.7.4
+