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Commit 7df620d8 authored by Ed L. Cashin's avatar Ed L. Cashin Committed by Linus Torvalds
Browse files

aoe: add module parameter for users who need more outstanding I/O 



An AoE target provides an estimate of the number of outstanding commands that
the AoE initiator can send before getting a response.  The aoe_maxout
parameter provides a way to set an even lower limit.  It will not allow a user
to use more outstanding commands than the target permits.  If a user discovers
a problem with a large setting, this parameter provides a way for us to work
with them to debug the problem.  We expect to improve the dynamic window
sizing algorithm and drop this parameter.  For the time being, it is a
debugging aid.

Signed-off-by: default avatarEd L. Cashin <ecashin@coraid.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6b9699bb

drivers/block/aoe/aoecmd.c

+7 −3
Original line number Diff line number Diff line
@@ -18,6 +18,11 @@ static int aoe_deadsecs = 60 * 3; 
module_param(aoe_deadsecs, int, 0644);

MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");



static int aoe_maxout = 16;

module_param(aoe_maxout, int, 0644);

MODULE_PARM_DESC(aoe_maxout,

	"Only aoe_maxout outstanding packets for every MAC on eX.Y.");



static struct sk_buff *

new_skb(ulong len)

{
@@ -984,7 +989,6 @@ aoecmd_cfg_rsp(struct sk_buff *skb) 
	struct aoeif *ifp;

	ulong flags, sysminor, aoemajor;

	struct sk_buff *sl;

	enum { MAXFRAMES = 16 };

	u16 n;



	h = (struct aoe_hdr *) skb_mac_header(skb);
@@ -1009,8 +1013,8 @@ aoecmd_cfg_rsp(struct sk_buff *skb) 
	}



	n = be16_to_cpu(ch->bufcnt);

	if (n > MAXFRAMES)	/* keep it reasonable */

		n = MAXFRAMES;

	if (n > aoe_maxout)	/* keep it reasonable */

		n = aoe_maxout;



	d = aoedev_by_sysminor_m(sysminor);

	if (d == NULL) {