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qubes-linux-kernel/patches.xen/xen-op-packet

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From: plc@novell.com
Subject: add support for new operation type BLKIF_OP_PACKET
Patch-mainline: n/a
References: fate#300964
--- head-2010-04-29.orig/drivers/xen/blkback/blkback.c 2010-03-24 15:25:21.000000000 +0100
+++ head-2010-04-29/drivers/xen/blkback/blkback.c 2010-03-25 14:38:05.000000000 +0100
@@ -195,13 +195,15 @@ static void fast_flush_area(pending_req_
static void print_stats(blkif_t *blkif)
{
- printk(KERN_DEBUG "%s: oo %3d | rd %4d | wr %4d | br %4d\n",
+ printk(KERN_DEBUG "%s: oo %3d | rd %4d | wr %4d | br %4d | pk %4d\n",
current->comm, blkif->st_oo_req,
- blkif->st_rd_req, blkif->st_wr_req, blkif->st_br_req);
+ blkif->st_rd_req, blkif->st_wr_req, blkif->st_br_req,
+ blkif->st_pk_req);
blkif->st_print = jiffies + msecs_to_jiffies(10 * 1000);
blkif->st_rd_req = 0;
blkif->st_wr_req = 0;
blkif->st_oo_req = 0;
+ blkif->st_pk_req = 0;
}
int blkif_schedule(void *arg)
@@ -374,6 +376,13 @@ handle_request:
blkif->st_wr_req++;
ret = dispatch_rw_block_io(blkif, &req, pending_req);
break;
+ case BLKIF_OP_PACKET:
+ DPRINTK("error: block operation BLKIF_OP_PACKET not implemented\n");
+ blkif->st_pk_req++;
+ make_response(blkif, req.id, req.operation,
+ BLKIF_RSP_ERROR);
+ free_req(pending_req);
+ break;
default:
/* A good sign something is wrong: sleep for a while to
* avoid excessive CPU consumption by a bad guest. */
--- head-2010-04-29.orig/drivers/xen/blkback/common.h 2010-03-25 14:38:02.000000000 +0100
+++ head-2010-04-29/drivers/xen/blkback/common.h 2010-03-25 14:38:05.000000000 +0100
@@ -92,6 +92,7 @@ typedef struct blkif_st {
int st_wr_req;
int st_oo_req;
int st_br_req;
+ int st_pk_req;
int st_rd_sect;
int st_wr_sect;
--- head-2010-04-29.orig/drivers/xen/blkfront/blkfront.c 2010-03-24 15:25:21.000000000 +0100
+++ head-2010-04-29/drivers/xen/blkfront/blkfront.c 2010-03-25 14:38:05.000000000 +0100
@@ -671,6 +671,8 @@ static int blkif_queue_request(struct re
BLKIF_OP_WRITE : BLKIF_OP_READ;
if (blk_barrier_rq(req))
ring_req->operation = BLKIF_OP_WRITE_BARRIER;
+ if (blk_pc_request(req))
+ ring_req->operation = BLKIF_OP_PACKET;
ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
@@ -728,7 +730,7 @@ void do_blkif_request(struct request_que
blk_start_request(req);
- if (!blk_fs_request(req)) {
+ if (!blk_fs_request(req) && !blk_pc_request(req)) {
__blk_end_request_all(req, -EIO);
continue;
}
@@ -799,6 +801,7 @@ static irqreturn_t blkif_int(int irq, vo
/* fall through */
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
+ case BLKIF_OP_PACKET:
if (unlikely(bret->status != BLKIF_RSP_OKAY))
DPRINTK("Bad return from blkdev data "
"request: %x\n", bret->status);
--- head-2010-04-29.orig/drivers/xen/blktap/blktap.c 2010-04-29 10:16:10.000000000 +0200
+++ head-2010-04-29/drivers/xen/blktap/blktap.c 2010-04-29 10:16:17.000000000 +0200
@@ -1148,13 +1148,14 @@ static void fast_flush_area(pending_req_
static void print_stats(blkif_t *blkif)
{
- printk(KERN_DEBUG "%s: oo %3d | rd %4d | wr %4d\n",
+ printk(KERN_DEBUG "%s: oo %3d | rd %4d | wr %4d | pk %4d\n",
current->comm, blkif->st_oo_req,
- blkif->st_rd_req, blkif->st_wr_req);
+ blkif->st_rd_req, blkif->st_wr_req, blkif->st_pk_req);
blkif->st_print = jiffies + msecs_to_jiffies(10 * 1000);
blkif->st_rd_req = 0;
blkif->st_wr_req = 0;
blkif->st_oo_req = 0;
+ blkif->st_pk_req = 0;
}
int tap_blkif_schedule(void *arg)
@@ -1396,6 +1397,11 @@ static int do_block_io_op(blkif_t *blkif
dispatch_rw_block_io(blkif, &req, pending_req);
break;
+ case BLKIF_OP_PACKET:
+ blkif->st_pk_req++;
+ dispatch_rw_block_io(blkif, &req, pending_req);
+ break;
+
default:
/* A good sign something is wrong: sleep for a while to
* avoid excessive CPU consumption by a bad guest. */
@@ -1435,6 +1441,8 @@ static void dispatch_rw_block_io(blkif_t
struct vm_area_struct *vma = NULL;
switch (req->operation) {
+ case BLKIF_OP_PACKET:
+ /* Fall through */
case BLKIF_OP_READ:
operation = READ;
break;
--- head-2010-04-29.orig/drivers/xen/blktap/common.h 2010-03-24 15:09:22.000000000 +0100
+++ head-2010-04-29/drivers/xen/blktap/common.h 2010-03-25 14:38:05.000000000 +0100
@@ -75,6 +75,7 @@ typedef struct blkif_st {
int st_rd_req;
int st_wr_req;
int st_oo_req;
+ int st_pk_req;
int st_rd_sect;
int st_wr_sect;
--- head-2010-04-29.orig/drivers/xen/blktap2/blktap.h 2010-04-15 11:24:08.000000000 +0200
+++ head-2010-04-29/drivers/xen/blktap2/blktap.h 2010-04-15 11:42:01.000000000 +0200
@@ -138,6 +138,7 @@ struct blktap_statistics {
int st_rd_req;
int st_wr_req;
int st_oo_req;
+ int st_pk_req;
int st_rd_sect;
int st_wr_sect;
s64 st_rd_cnt;
--- head-2010-04-29.orig/drivers/xen/blktap2/device.c 2010-04-19 14:54:02.000000000 +0200
+++ head-2010-04-29/drivers/xen/blktap2/device.c 2010-04-19 14:55:13.000000000 +0200
@@ -369,7 +369,8 @@ blktap_device_fail_pending_requests(stru
BTERR("%u:%u: failing pending %s of %d pages\n",
blktap_device_major, tap->minor,
- (request->operation == BLKIF_OP_READ ?
+ (request->operation == BLKIF_OP_PACKET ?
+ "packet" : request->operation == BLKIF_OP_READ ?
"read" : "write"), request->nr_pages);
blktap_unmap(tap, request);
@@ -410,6 +411,7 @@ blktap_device_finish_request(struct blkt
switch (request->operation) {
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
+ case BLKIF_OP_PACKET:
if (unlikely(res->status != BLKIF_RSP_OKAY))
BTERR("Bad return from device data "
"request: %x\n", res->status);
@@ -649,6 +651,8 @@ blktap_device_process_request(struct blk
blkif_req.handle = 0;
blkif_req.operation = rq_data_dir(req) ?
BLKIF_OP_WRITE : BLKIF_OP_READ;
+ if (unlikely(blk_pc_request(req)))
+ blkif_req.operation = BLKIF_OP_PACKET;
request->id = (unsigned long)req;
request->operation = blkif_req.operation;
@@ -714,7 +718,9 @@ blktap_device_process_request(struct blk
wmb(); /* blktap_poll() reads req_prod_pvt asynchronously */
ring->ring.req_prod_pvt++;
- if (rq_data_dir(req)) {
+ if (unlikely(blk_pc_request(req)))
+ tap->stats.st_pk_req++;
+ else if (rq_data_dir(req)) {
tap->stats.st_wr_sect += nr_sects;
tap->stats.st_wr_req++;
} else {
--- head-2010-04-29.orig/include/xen/interface/io/blkif.h 2010-01-19 16:01:04.000000000 +0100
+++ head-2010-04-29/include/xen/interface/io/blkif.h 2010-03-25 14:38:05.000000000 +0100
@@ -76,6 +76,10 @@
* "feature-flush-cache" node!
*/
#define BLKIF_OP_FLUSH_DISKCACHE 3
+/*
+ * Device specific command packet contained within the request
+ */
+#define BLKIF_OP_PACKET 4
/*
* Maximum scatter/gather segments per request.
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