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Set si_iosize_max to 64K, even though the adapter seems to be able to do more.

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This puts us safely in line with Adaptec documentation and shouldn't really
affect anything.

MFC candidate for 4.3
This commit is contained in:
scottl 2001-03-07 08:37:49 +00:00
parent bfd72934ab
commit 45846aa7f1
1 changed files with 4 additions and 11 deletions
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15
sys/dev/aac/aac_disk.c
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@ -219,8 +219,6 @@ static int
aac_disk_attach(device_t dev)
{
struct aac_disk *sc = (struct aac_disk *)device_get_softc(dev);
int sgspace;
int maxsg;
debug_called(4);
@ -258,16 +256,11 @@ aac_disk_attach(device_t dev)
disks_registered++;
#endif
/*
* We can calculate the maximum number of s/g entries based on the size of the
* FIB and the command structures packed within it.
/*
* The adapters seem to have a 64K size limit on the max I/O size. Set
* our size on accordance.
*/
sgspace = (sizeof(struct aac_fib) - sizeof(struct aac_fib_header) -
imax(sizeof(struct aac_blockwrite), sizeof(struct aac_blockread)));
maxsg = (sgspace - sizeof(struct aac_sg_table)) / sizeof(struct aac_sg_entry);
/* set the maximum I/O size to the theoretical worst maximum allowed by the S/G list size */
sc->ad_dev_t->si_iosize_max = (maxsg - 1) * PAGE_SIZE;
sc->ad_dev_t->si_iosize_max = 65536;
return (0);
}