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authorEd L. Cashin <ecashin@coraid.com>2006-09-20 14:36:49 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-10-18 12:53:50 -0700
commite407a7f6cd143b3ab4eb3d7e1cf882e96b710eb5 (patch)
treea180d2a6ae40b1fe6773c93a24a5c469948fd59d /drivers/block/aoe/aoe.h
parent2fdc0ea75b26e3009cfdf72e79901e4e16bb99bd (diff)
aoe: zero copy write 1 of 2
Avoid memory copy on writes. (This patch depends on fixes in patch 9 to follow.) Although skb->len should not be set when working with linear skbuffs, the skb->tail pointer maintained by skb_put/skb_trim is not relevant to what happens when the skb_fill_page_desc function is called. This issue was raised without comment in linux-kernel and netdev earlier this month: http://thread.gmane.org/gmane.linux.kernel/446474/ http://thread.gmane.org/gmane.linux.network/45444/ So until there is something analogous to skb_put that works for zero-copy write skbuffs, we will do what the other callers of skb_fill_page_desc are doing. Signed-off-by: "Ed L. Cashin" <ecashin@coraid.com> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/block/aoe/aoe.h')
-rw-r--r--drivers/block/aoe/aoe.h7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 507c3779988..fa2d804b266 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -107,11 +107,7 @@ struct frame {
ulong waited;
struct buf *buf;
char *bufaddr;
- int writedatalen;
- int ndata;
-
- /* largest possible */
- unsigned char data[sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr)];
+ struct sk_buff *skb;
};
struct aoedev {
@@ -157,6 +153,7 @@ void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
void aoecmd_ata_rsp(struct sk_buff *);
void aoecmd_cfg_rsp(struct sk_buff *);
void aoecmd_sleepwork(void *vp);
+struct sk_buff *new_skb(ulong);
int aoedev_init(void);
void aoedev_exit(void);