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Adjust the descriptor structures a little by making the software parts

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be unions with enough padding to make sure they always end up being
a multiple of 8 bytes in size, since the 83820/83821 chips require
descriptors to be aligned on 64-bit boundaries. I happened to get it
right for the 32-bit descriptor/x86 case, but botched everything else.
Things should work properle on 32-bit/64-bit platforms now.

Note that the 64-bit descriptor format isn't being used currently.
This commit is contained in:
Bill Paul 2001-05-15 21:42:43 +00:00
parent 01e281bd12
commit ddde4ea967
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76638
1 changed files with 12 additions and 4 deletions
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16
sys/dev/nge/if_ngereg.h
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@ -484,8 +484,11 @@ struct nge_desc_64 {
#define nge_ctl nge_cmdsts
u_int32_t nge_extsts;
/* Driver software section */
struct mbuf *nge_mbuf;
struct nge_desc_64 *nge_nextdesc;
union {
struct mbuf *nge_mbuf;
struct nge_desc_64 *nge_nextdesc;
u_int64_t nge_dummy[2];
} nge_u;
};
struct nge_desc_32 {
@ -498,11 +501,16 @@ struct nge_desc_32 {
#define nge_ctl nge_cmdsts
u_int32_t nge_extsts;
/* Driver software section */
struct mbuf *nge_mbuf;
struct nge_desc_32 *nge_nextdesc;
union {
struct mbuf *nge_mbuf;
struct nge_desc_32 *nge_nextdesc;
u_int64_t nge_dummy[2];
} nge_u;
};
#define nge_desc nge_desc_32
#define nge_mbuf nge_u.nge_mbuf
#define nge_nextdesc nge_u.nge_nextdesc
#define NGE_CMDSTS_BUFLEN 0x0000FFFF
#define NGE_CMDSTS_PKT_OK 0x08000000