On 08/19/13 06:56, Andre Oppermann wrote:
> Author: andre
> Date: Mon Aug 19 13:56:14 2013
> New Revision: 254524
> URL: http://svnweb.freebsd.org/changeset/base/254524
> 
> Log:
>   Add four additional M_PROTOFLAGS[9-12] for protocol specific use.
>   
>   Discussed with:     trociny, glebius, adrian
> 
> Modified:
>   head/sys/sys/mbuf.h
> 
> Modified: head/sys/sys/mbuf.h
> ==============================================================================
> --- head/sys/sys/mbuf.h       Mon Aug 19 13:27:32 2013        (r254523)
> +++ head/sys/sys/mbuf.h       Mon Aug 19 13:56:14 2013        (r254524)
> @@ -196,22 +196,24 @@ struct mbuf {
>  #define      M_FRAG          0x00000800 /* packet is a fragment of a larger 
> packet */
>  #define      M_FIRSTFRAG     0x00001000 /* packet is first fragment */
>  #define      M_LASTFRAG      0x00002000 /* packet is last fragment */
> -                  /* 0x00004000    free */
> -                  /* 0x00008000    free */
> +#define      M_PROTO9        0x00004000 /* protocol-specific */
> +#define      M_PROTO10       0x00008000 /* protocol-specific */
>  #define      M_VLANTAG       0x00010000 /* ether_vtag is valid */
>  #define      M_PROMISC       0x00020000 /* packet was not for us */
> -                  /* 0x00040000    free */
> +#define      M_PROTO11       0x00040000 /* protocol-specific */
>  #define      M_PROTO6        0x00080000 /* protocol-specific */
>  #define      M_PROTO7        0x00100000 /* protocol-specific */
>  #define      M_PROTO8        0x00200000 /* protocol-specific */
>  #define      M_FLOWID        0x00400000 /* deprecated: flowid is valid */
> +#define      M_PROTO12       0x00800000 /* protocol-specific */
>  #define      M_HASHTYPEBITS  0x0F000000 /* mask of bits holding flowid hash 
> type */

Why reuse the freed up bits so soon (at least one of which I think was
prematurely GC'ed -- see my other email on M_NOFREE).  There was room
beyond M_HASHTYPEBITS, no?

Regards,
Navdeep

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