Re: [dpdk-dev] [PATCH 7/7] Move EAL common functions

[Neil Horman <nhorman@tuxdriver.com>]

On Thu, Dec 25, 2014 at 11:22:53AM -0800, Ravi Kerur wrote:
> Inline <rk>
> 
> On Thu, Dec 25, 2014 at 9:46 AM, Neil Horman <nhorman@tuxdriver.com> wrote:
> 
> > On Thu, Dec 25, 2014 at 10:33:17AM -0500, Ravi Kerur wrote:
> > > Move common functions in eal_memory.c to librte_eal/common
> > > directory.
> > > Use RTE_EXEC_ENV_BSDAPP to differentiate minor differences in
> > > common functions.
> > > Fix checkpatch warnings and errors.
> > >
> > > Signed-off-by: Ravi Kerur <rkerur@gmail.com>
> > > ---
> > >  lib/librte_eal/bsdapp/eal/eal_memory.c    | 36
> > ++------------------------
> > >  lib/librte_eal/common/eal_common_memory.c | 43
> > +++++++++++++++++++++++++++++--
> > >  lib/librte_eal/common/eal_private.h       | 28 ++++++++++++++++++++
> > >  lib/librte_eal/linuxapp/eal/eal_memory.c  | 36
> > ++------------------------
> > >  4 files changed, 73 insertions(+), 70 deletions(-)
> > >
> > > diff --git a/lib/librte_eal/bsdapp/eal/eal_memory.c
> > b/lib/librte_eal/bsdapp/eal/eal_memory.c
> > > index 65ee87d..b192705 100644
> > > --- a/lib/librte_eal/bsdapp/eal/eal_memory.c
> > > +++ b/lib/librte_eal/bsdapp/eal/eal_memory.c
> > > @@ -59,7 +59,7 @@ rte_mem_virt2phy(const void *virtaddr)
> > >       return RTE_BAD_PHYS_ADDR;
> > >  }
> > >
> > > -static int
> > > +int
> > >  rte_eal_contigmem_init(void)
> > >  {
> > >       struct rte_mem_config *mcfg;
> > > @@ -130,7 +130,7 @@ rte_eal_contigmem_init(void)
> > >       return 0;
> > >  }
> > >
> > > -static int
> > > +int
> > >  rte_eal_contigmem_attach(void)
> > >  {
> > >       const struct hugepage_info *hpi;
> > > @@ -190,35 +190,3 @@ error:
> > >       return -1;
> > >  }
> > >
> > > -
> > > -static int
> > > -rte_eal_memdevice_init(void)
> > > -{
> > > -     struct rte_config *config;
> > > -
> > > -     if (rte_eal_process_type() == RTE_PROC_SECONDARY)
> > > -             return 0;
> > > -
> > > -     config = rte_eal_get_configuration();
> > > -     config->mem_config->nchannel = internal_config.force_nchannel;
> > > -     config->mem_config->nrank = internal_config.force_nrank;
> > > -
> > > -     return 0;
> > > -}
> > > -
> > > -/* init memory subsystem */
> > > -int
> > > -rte_eal_memory_init(void)
> > > -{
> > > -     RTE_LOG(INFO, EAL, "Setting up physically contiguous memory...\n");
> > > -     const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
> > > -                     rte_eal_contigmem_init() :
> > > -                     rte_eal_contigmem_attach();
> > > -     if (retval < 0)
> > > -             return -1;
> > > -
> > > -     if (internal_config.no_shconf == 0 && rte_eal_memdevice_init() < 0)
> > > -             return -1;
> > > -
> > > -     return 0;
> > > -}
> > > diff --git a/lib/librte_eal/common/eal_common_memory.c
> > b/lib/librte_eal/common/eal_common_memory.c
> > > index 77830f8..da7aa98 100644
> > > --- a/lib/librte_eal/common/eal_common_memory.c
> > > +++ b/lib/librte_eal/common/eal_common_memory.c
> > > @@ -46,6 +46,7 @@
> > >  #include <rte_log.h>
> > >
> > >  #include "eal_private.h"
> > > +#include "eal_internal_cfg.h"
> > >
> > >  /*
> > >   * Return a pointer to a read-only table of struct rte_physmem_desc
> > > @@ -70,7 +71,7 @@ rte_eal_get_physmem_size(void)
> > >       /* get pointer to global configuration */
> > >       mcfg = rte_eal_get_configuration()->mem_config;
> > >
> > > -     for (i=0; i<RTE_MAX_MEMSEG; i++) {
> > > +     for (i = 0; i < RTE_MAX_MEMSEG; i++) {
> > >               if (mcfg->memseg[i].addr == NULL)
> > >                       break;
> > >
> > > @@ -90,7 +91,7 @@ rte_dump_physmem_layout(FILE *f)
> > >       /* get pointer to global configuration */
> > >       mcfg = rte_eal_get_configuration()->mem_config;
> > >
> > > -     for (i=0; i<RTE_MAX_MEMSEG; i++) {
> > > +     for (i = 0; i < RTE_MAX_MEMSEG; i++) {
> > >               if (mcfg->memseg[i].addr == NULL)
> > >                       break;
> > >
> > > @@ -119,3 +120,41 @@ unsigned rte_memory_get_nrank(void)
> > >  {
> > >       return rte_eal_get_configuration()->mem_config->nrank;
> > >  }
> > > +
> > > +static int
> > > +rte_eal_memdevice_init(void)
> > > +{
> > > +     struct rte_config *config;
> > > +
> > > +     if (rte_eal_process_type() == RTE_PROC_SECONDARY)
> > > +             return 0;
> > > +
> > > +     config = rte_eal_get_configuration();
> > > +     config->mem_config->nchannel = internal_config.force_nchannel;
> > > +     config->mem_config->nrank = internal_config.force_nrank;
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +/* init memory subsystem */
> > > +int
> > > +rte_eal_memory_init(void)
> > > +{
> > > +     RTE_LOG(INFO, EAL, "Setting up physically contiguous memory...\n");
> > > +     const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
> > > +#ifdef RTE_EXEC_ENV_BSDAPP
> > > +                     rte_eal_contigmem_init() :
> > > +                     rte_eal_contigmem_attach();
> > > +#else /* RTE_EXEC_ENV_BSDAPP */
> > > +                     rte_eal_hugepage_init() :
> > > +                     rte_eal_hugepage_attach();
> > > +#endif /* RTE_EXEC_ENV_BSDAPP */
> > Given that the functions you are calling here are only ever build for the
> > platform they are called from, it seems to me that you can give them a
> > shared
> > name, and just build the appropriate one.  I.e. you don't need to add
> > ifdeffery
> > here.
> >
> >
> <rk> Agreed and will be done. Only reason I left it as is because I thought
> it might create confusion since in the code/document in BSD it's referred
> as contigmem rather than hugepage.
> 
I agree, it might be a bit confusing, but I think documenting it would be
superior to creating separate function names with additional ifdeffery.  cscope
illustrates pretty well multiple function definitions.

Neil