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From: Stephen Hemminger <stephen@networkplumber.org>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 2/7] ether: do not mark ethernet address and header as packed
Date: Thu, 16 May 2019 16:17:35 -0700	[thread overview]
Message-ID: <20190516161735.29d95e6e@hermes.lan> (raw)
In-Reply-To: <20190516204005.GD642@bricha3-MOBL.ger.corp.intel.com>

On Thu, 16 May 2019 21:40:05 +0100
Bruce Richardson <bruce.richardson@intel.com> wrote:

> On Thu, May 16, 2019 at 11:04:22AM -0700, Stephen Hemminger wrote:
> > Since the Ethernet address and header are naturally aligned
> > correctly on all architectures, there is no need to mark them
> > as packed. This results in faster code, and also gets rid of
> > warnings with gcc-9 about getting address of packed structure.
> > 
> > Suggested-by: Bruce Richardson <bruce.richardson@intel.com>
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> >  lib/librte_net/rte_ether.h | 10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> > 
> > diff --git a/lib/librte_net/rte_ether.h b/lib/librte_net/rte_ether.h
> > index ac8897681aca..0954d183cca7 100644
> > --- a/lib/librte_net/rte_ether.h
> > +++ b/lib/librte_net/rte_ether.h
> > @@ -57,7 +57,7 @@ extern "C" {
> >  struct ether_addr {
> >  	/** Addr bytes in tx order */
> >  	uint8_t addr_bytes[ETHER_ADDR_LEN] __rte_aligned(2);
> > -} __attribute__((__packed__));
> > +};
> >  
> >  #define ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
> >  #define ETHER_GROUP_ADDR       0x01 /**< Multicast or broadcast Eth. address. */
> > @@ -273,7 +273,7 @@ struct ether_hdr {
> >  	struct ether_addr d_addr; /**< Destination address. */
> >  	struct ether_addr s_addr; /**< Source address. */
> >  	uint16_t ether_type;      /**< Frame type. */
> > -} __attribute__((__packed__));
> > +};
> >  
> >  /**
> >   * Ethernet VLAN Header.
> > @@ -283,7 +283,7 @@ struct ether_hdr {
> >  struct vlan_hdr {
> >  	uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
> >  	uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
> > -} __attribute__((__packed__));
> > +};
> >  
> >  /**
> >   * VXLAN protocol header.
> > @@ -293,7 +293,7 @@ struct vlan_hdr {
> >  struct vxlan_hdr {
> >  	uint32_t vx_flags; /**< flag (8) + Reserved (24). */
> >  	uint32_t vx_vni;   /**< VNI (24) + Reserved (8). */
> > -} __attribute__((__packed__));
> > +};
> >  
> >  /* Ethernet frame types */
> >  #define ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
> > @@ -325,7 +325,7 @@ struct vxlan_gpe_hdr {
> >  	uint8_t reserved[2]; /**< Reserved (16). */
> >  	uint8_t proto;       /**< next-protocol (8). */
> >  	uint32_t vx_vni;     /**< VNI (24) + Reserved (8). */
> > -} __attribute__((__packed__));
> > +};
> >    
> 
> Are we sure that these last two structures are always 4-byte aligned in
> packets?

That is a general issue of unaligned IP header problem.
Really we should be doing a combination of packed and 2 byte alignment.

I will drop the Vxlan and NVGre ones


  reply	other threads:[~2019-05-16 23:17 UTC|newest]

Thread overview: 127+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 18:04 [dpdk-dev] [PATCH v2 0/7] ether: improvements and optimizations Stephen Hemminger
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 1/7] ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 2/7] ether: do not mark ethernet address and header as packed Stephen Hemminger
2019-05-16 20:40   ` Bruce Richardson
2019-05-16 23:17     ` Stephen Hemminger [this message]
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 3/7] ether: deinline non-critical functions Stephen Hemminger
2019-05-16 18:29   ` Rami Rosen
2019-05-17  7:08   ` David Marchand
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 4/7] ether: add eth_unformat_addr Stephen Hemminger
2019-05-17  7:08   ` David Marchand
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 5/7] ethdev: use eth_unformat_addr Stephen Hemminger
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 6/7] ether: use bitops to speedup comparison Stephen Hemminger
2019-05-16 18:04 ` [dpdk-dev] [PATCH v2 7/7] cmdline: use ether_unformat_addr Stephen Hemminger
2019-06-05  1:08 ` [dpdk-dev] [PATCH v3 0/6] net/ether: improvements and optimizations Stephen Hemminger
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 1/6] net/rte_ether: deinline non-critical functions Stephen Hemminger
2019-06-05  8:44     ` Andrew Rybchenko
2019-06-05 16:29       ` Stephen Hemminger
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 2/6] net/ether: add rte_eth_unformat_addr Stephen Hemminger
2019-06-05  8:55     ` Andrew Rybchenko
2019-06-05 16:31       ` Stephen Hemminger
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 3/6] ethdev: use rte_eth_unformat_addr Stephen Hemminger
2019-06-05  8:59     ` Andrew Rybchenko
2019-06-05 15:02       ` Stephen Hemminger
2019-06-05 16:33       ` Stephen Hemminger
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 4/6] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-06-05  9:02     ` Andrew Rybchenko
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 5/6] net/ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-06-05  9:04     ` Andrew Rybchenko
2019-06-05  1:08   ` [dpdk-dev] [PATCH v3 6/6] cmdline: use rte_ether_unformat_addr Stephen Hemminger
2019-06-05 18:09 ` [dpdk-dev] [PATCH v4 0/8] net/ether: enhancements and optimizations Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 1/8] net/rte_ether: deinline non-critical functions Stephen Hemminger
2019-06-06  8:06     ` Maxime Coquelin
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 2/8] net/ether: add rte_eth_unformat_addr Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 3/8] ethdev: use rte_eth_unformat_addr Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 4/8] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 5/8] net/ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-06-07 16:59     ` Ananyev, Konstantin
2019-06-07 18:35       ` Stephen Hemminger
2019-06-07 20:40         ` Richardson, Bruce
2019-06-08 11:51         ` Ananyev, Konstantin
2019-06-07 20:39       ` Richardson, Bruce
2019-06-08 12:15         ` Ananyev, Konstantin
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 6/8] cmdline: use rte_ether_unformat_addr Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 7/8] net/bonding: use rte_ether_unformat_addr rather than cmdline_parse Stephen Hemminger
2019-06-05 18:09   ` [dpdk-dev] [PATCH v4 8/8] app/testpmd: use rte_ether_unformat_addr Stephen Hemminger
2019-06-20 14:18     ` Iremonger, Bernard
2019-06-20 16:12       ` Stephen Hemminger
2019-06-24 20:44 ` [dpdk-dev] [PATCH v5 0/8] net/ether: enhancements and optimizations Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 1/8] net/rte_ether: deinline non-critical functions Stephen Hemminger
2019-07-02  7:56     ` Olivier Matz
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 2/8] net/ether: add function to convert string to ethernet address Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 3/8] ethdev: use new ethernet parsing function Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 4/8] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-07-02  7:53     ` Olivier Matz
2019-07-02  9:26       ` Olivier Matz
2019-07-02 15:28         ` Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 5/8] net/ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 6/8] cmdline: use new ethernet address parser Stephen Hemminger
     [not found]     ` <8688172CD5C0B74590FAE19D9579F94B53742875@SHSMSX103.ccr.corp.intel.com>
2019-07-16 16:17       ` Stephen Hemminger
2019-07-17 14:04         ` Aaron Conole
2019-07-17 14:39           ` Olivier Matz
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 7/8] net/bonding: " Stephen Hemminger
2019-06-24 20:44   ` [dpdk-dev] [PATCH v5 8/8] app/testpmd: " Stephen Hemminger
2019-07-02 16:50 ` [dpdk-dev] [PATCH v6 0/8] net/ether: enhancements and optimizations Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 1/8] net/rte_ether: deinline non-critical functions Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 2/8] net/ether: add function to convert string to ethernet address Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 3/8] ethdev: use new ethernet parsing function Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 4/8] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 5/8] net/ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-07-02 21:46     ` Ananyev, Konstantin
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 6/8] cmdline: use new ethernet address parser Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 7/8] net/bonding: " Stephen Hemminger
2019-07-02 16:50   ` [dpdk-dev] [PATCH v6 8/8] app/testpmd: " Stephen Hemminger
2019-07-02 21:37   ` [dpdk-dev] [PATCH v6 0/8] net/ether: enhancements and optimizations Thomas Monjalon
2019-07-02 22:03     ` Stephen Hemminger
2019-07-02 22:12 ` [dpdk-dev] [PATCH v7 00/12] ether: improvements " Stephen Hemminger
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 01/12] net/rte_ether: deinline non-critical functions Stephen Hemminger
2019-07-05 14:25     ` Olivier Matz
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 02/12] net/ether: add function to convert string to ethernet address Stephen Hemminger
2019-07-05 14:25     ` Olivier Matz
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 03/12] ethdev: use new ethernet parsing function Stephen Hemminger
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 04/12] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-07-05 14:34     ` Olivier Matz
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 05/12] net/ether: mark ethernet addresses as being 2-byte aligned Stephen Hemminger
2019-07-05 14:34     ` Olivier Matz
2019-07-05 15:45       ` Richardson, Bruce
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 06/12] cmdline: use new ethernet address parser Stephen Hemminger
2019-07-05 14:46     ` Olivier Matz
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 07/12] net/bonding: " Stephen Hemminger
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 08/12] app/testpmd: " Stephen Hemminger
2019-07-03 13:30     ` Iremonger, Bernard
2019-07-05 17:12       ` Stephen Hemminger
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 09/12] net/virtio: use new ether addr parsing Stephen Hemminger
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 10/12] net/failsafe: use common ether address parsing routine Stephen Hemminger
2019-07-03  9:10     ` Gaëtan Rivet
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 11/12] net/vdev_netvsc: use common ethernet address parsing Stephen Hemminger
2019-07-03  8:12     ` Matan Azrad
2019-07-02 22:12   ` [dpdk-dev] [PATCH v7 12/12] net/memif: use common ethernet address parsing routine Stephen Hemminger
2019-07-05 17:16 ` [dpdk-dev] [PATCH v8 00/11] ether: improvements and optimizations Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 01/11] net/ether: deinline non-critical functions Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 02/11] net/ether: add function to convert string to ethernet address Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 03/11] ethdev: use new ethernet parsing function Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 04/11] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 05/11] cmdline: use new ethernet address parser Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 06/11] net/bonding: " Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 07/11] app/testpmd: " Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 08/11] net/virtio: use new ether addr parsing Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 09/11] net/failsafe: use common ether address parsing routine Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 10/11] net/vdev_netvsc: use common ethernet address parsing Stephen Hemminger
2019-07-05 17:16   ` [dpdk-dev] [PATCH v8 11/11] net/memif: use common ethernet address parsing routine Stephen Hemminger
2019-07-08 18:26 ` [dpdk-dev] [PATCH v9 00/11] ether: improvements and optimizations Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 01/11] net/ether: deinline non-critical functions Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 02/11] net/ether: add function to convert string to ethernet address Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 03/11] ethdev: use new ethernet parsing function Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 04/11] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 05/11] cmdline: use new ethernet address parser Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 06/11] net/bonding: " Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 07/11] app/testpmd: " Stephen Hemminger
2019-07-21 13:42     ` Raslan Darawsheh
2019-07-22 12:09       ` Thomas Monjalon
2019-07-22 16:15       ` Ferruh Yigit
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 08/11] net/virtio: use new ether addr parsing Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 09/11] net/failsafe: use common ether address parsing routine Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 10/11] net/vdev_netvsc: use common ethernet address parsing Stephen Hemminger
2019-07-08 18:26   ` [dpdk-dev] [PATCH v9 11/11] net/memif: use common ethernet address parsing routine Stephen Hemminger
2019-07-08 19:13   ` [dpdk-dev] [PATCH v9 00/11] ether: improvements and optimizations Ferruh Yigit
2019-07-09 15:01     ` Bruce Richardson

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