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-rw-r--r--dpdk/dpdk-2.1.0_patches/0002-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch107
1 files changed, 107 insertions, 0 deletions
diff --git a/dpdk/dpdk-2.1.0_patches/0002-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch b/dpdk/dpdk-2.1.0_patches/0002-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch
new file mode 100644
index 00000000000..2ce5004a421
--- /dev/null
+++ b/dpdk/dpdk-2.1.0_patches/0002-mbuf-rearrange-rte_mbuf-metadata-to-suit-vpp.patch
@@ -0,0 +1,107 @@
+From 3609c4fb4d07d4285e96187598f54cb21e9e9b08 Mon Sep 17 00:00:00 2001
+From: Shesha Sreenivasamurthy <shesha@cisco.com>
+Date: Wed, 2 Sep 2015 08:57:24 -0700
+Subject: [PATCH 2/9] mbuf: rearrange rte_mbuf metadata to suit vpp
+
+Offload structure in the second cache line, next pointer in the
+first cache line. Issue reported to Intel.
+---
+ .../linuxapp/eal/include/exec-env/rte_kni_common.h | 10 +++++++--
+ lib/librte_mbuf/rte_mbuf.h | 25 ++++++++++++++--------
+ 2 files changed, 24 insertions(+), 11 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 e9f38bd..d327f71 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
+@@ -111,6 +111,10 @@ struct rte_kni_fifo {
+ * The kernel image of the rte_mbuf struct, with only the relevant fields.
+ * Padding is necessary to assure the offsets of these fields
+ */
++/*
++ * offload in the second cache line, next in the first. Better for vpp
++ * at least as of right now.
++ */
+ struct rte_kni_mbuf {
+ void *buf_addr __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
+ char pad0[10];
+@@ -121,16 +125,18 @@ 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[2];
+ #else
+ char pad2[2];
+ uint16_t data_len; /**< Amount of data in segment buffer. */
+ uint32_t pkt_len; /**< Total pkt len: sum of all segment data_len. */
++ char pad3[4];
+ #endif
++ void *next;
+
+ /* fields on second cache line */
+- char pad3[8] __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
++ char pad4[12] __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
+ void *pool;
+- void *next;
+ };
+
+ /*
+diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
+index 8c2db1b..61cbbd7 100644
+--- a/lib/librte_mbuf/rte_mbuf.h
++++ b/lib/librte_mbuf/rte_mbuf.h
+@@ -743,6 +743,12 @@ 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;
+
+@@ -809,6 +815,16 @@ struct rte_mbuf {
+ uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
+ uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
+ #endif /* RTE_NEXT_ABI */
++ struct rte_mbuf *next; /**< Next segment of scattered packet. */
++
++ uint32_t seqn; /**< Sequence number. See also rte_reorder_insert() */
++#ifdef RTE_NEXT_ABI
++ uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
++#endif /* RTE_NEXT_ABI */
++
++ /* second cache line - fields only used in slow path or on TX */
++ MARKER cacheline1 __rte_cache_aligned;
++
+ union {
+ uint32_t rss; /**< RSS hash result if RSS enabled */
+ struct {
+@@ -828,21 +844,12 @@ 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() */
+-#ifdef RTE_NEXT_ABI
+- uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
+-#endif /* RTE_NEXT_ABI */
+-
+- /* second cache line - fields only used in slow path or on TX */
+- MARKER cacheline1 __rte_cache_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 {
+--
+2.5.0
+