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* [dpdk-dev] [PATCH v2 00/10] Improve cast alignment for strict aligned machines
@ 2015-06-19 17:34 Cyril Chemparathy
  2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 01/10] mempool: silence -Wcast-align on pointer arithmetic Cyril Chemparathy
                   ` (9 more replies)
  0 siblings, 10 replies; 16+ messages in thread
From: Cyril Chemparathy @ 2015-06-19 17:34 UTC (permalink / raw)
  To: dev

This series contains a few improvements that allow the DPDK code base
to build properly on machines that enforce strict pointer cast
alignment constraints.

When dealing with packet data which could be arbitrarily aligned, we
get the compiler to do the right thing by (a) making sure that header
types are packed, and (b) introducing and using
unaligned_uint(16|32|64)_t types when upcasting from byte pointers.

In a few other instances, we know apriori that the pointer cast cannot
possibly break alignment.  This applies to the changes in mempool,
hash, mbuf, and the ethdev stats code.  Here, we simply silence the
compiler by casting through (void *) using the RTE_PTR_(ADD|SUB)
macros.

Finally, we introduce a new rte_pktmbuf_mtod_offset() helper to return
a type casted pointer to an offset within the packet data.  This
replaces the following commonly used pattern:
	(struct foo *)(rte_pktmbuf_mtod(m, char *) + offset)
with:
	rte_pktmbuf_mtod_offset(m, struct foo *, offset)

To ensure consistency, the above transform was applied throughout the
code base using the coccinelle semantic patching tool.

Cyril Chemparathy (10):
  mempool: silence -Wcast-align on pointer arithmetic
  mbuf: silence -Wcast-align on pointer arithmetic
  ethdev: silence -Wcast-align on pointer arithmetic
  hash: silence -Wcast-align on pointer arithmetic
  eal: add and use unaligned integer types
  app/test-pmd: pack simple_gre_hdr
  app/test: use struct ether_addr instead of a byte array cast
  librte_mbuf: Add rte_pktmbuf_mtod_offset()
  librte_mbuf: Add transform for rte_pktmbuf_mtod_offset()
  librte_mbuf: Apply mtod-offset.cocci transform

 app/test-pmd/csumonly.c                    |  2 +-
 app/test-pmd/flowgen.c                     |  4 +-
 app/test-pmd/ieee1588fwd.c                 |  4 +-
 app/test-pmd/rxonly.c                      | 21 +++++----
 app/test-pmd/txonly.c                      |  6 +--
 app/test/packet_burst_generator.c          |  9 ++--
 app/test/test_mbuf.c                       | 16 +++----
 app/test/test_pmd_perf.c                   | 10 ++--
 drivers/net/mlx4/mlx4.c                    |  9 ++--
 examples/dpdk_qat/crypto.c                 |  8 ++--
 examples/dpdk_qat/main.c                   |  5 +-
 examples/l3fwd-acl/main.c                  | 20 ++++----
 examples/l3fwd-power/main.c                |  8 ++--
 examples/l3fwd-vf/main.c                   |  4 +-
 examples/l3fwd/main.c                      | 71 ++++++++++++----------------
 examples/load_balancer/runtime.c           |  4 +-
 examples/vhost_xen/main.c                  |  4 +-
 lib/librte_eal/common/include/rte_common.h | 10 ++++
 lib/librte_ether/rte_ethdev.c              | 24 +++++-----
 lib/librte_ether/rte_ether.h               |  2 +-
 lib/librte_hash/rte_hash.c                 | 10 ++--
 lib/librte_ip_frag/rte_ipv4_reassembly.c   |  7 ++-
 lib/librte_ip_frag/rte_ipv6_reassembly.c   |  5 +-
 lib/librte_mbuf/rte_mbuf.h                 | 32 +++++++++----
 lib/librte_mempool/rte_mempool.h           |  4 +-
 lib/librte_port/rte_port_ras.c             |  6 +--
 lib/librte_vhost/vhost_rxtx.c              |  6 +--
 scripts/cocci.sh                           | 64 +++++++++++++++++++++++++
 scripts/cocci/mtod-offset.cocci            | 76 ++++++++++++++++++++++++++++++
 29 files changed, 302 insertions(+), 149 deletions(-)
 create mode 100755 scripts/cocci.sh
 create mode 100644 scripts/cocci/mtod-offset.cocci

-- 
2.1.2

^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2015-06-22 16:57 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-06-19 17:34 [dpdk-dev] [PATCH v2 00/10] Improve cast alignment for strict aligned machines Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 01/10] mempool: silence -Wcast-align on pointer arithmetic Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 02/10] mbuf: " Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 03/10] ethdev: " Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 04/10] hash: " Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 05/10] eal: add and use unaligned integer types Cyril Chemparathy
2015-06-22  9:36   ` Thomas Monjalon
2015-06-22 16:47     ` Cyril Chemparathy
2015-06-22 16:56       ` Thomas Monjalon
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 06/10] app/test-pmd: pack simple_gre_hdr Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 07/10] app/test: use struct ether_addr instead of a byte array cast Cyril Chemparathy
2015-06-22  1:56   ` Stephen Hemminger
2015-06-22 16:40     ` Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 08/10] librte_mbuf: Add rte_pktmbuf_mtod_offset() Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 09/10] librte_mbuf: Add transform for rte_pktmbuf_mtod_offset() Cyril Chemparathy
2015-06-19 17:34 ` [dpdk-dev] [PATCH v2 10/10] librte_mbuf: Apply mtod-offset.cocci transform Cyril Chemparathy

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