drbd: Actually allow BIOs up to 128k (was 32k).

Now we have multiple BIOs per ee, packets with a 32 bit length field,
it gets time to use these goodies.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

4 files changed, 14 insertions, 5 deletions

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index db7e65531afa..58dc02bd16c2 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1389,11 +1389,13 @@ struct bm_extent {
 #endif
 
 /* Sector shift value for the "hash" functions of tl_hash and ee_hash tables.
- * With a value of 6 all IO in one 32K block make it to the same slot of the
+ * With a value of 8 all IO in one 128K block make it to the same slot of the
  * hash table. */
-#define HT_SHIFT 6
+#define HT_SHIFT 8
 #define DRBD_MAX_SEGMENT_SIZE (1U<<(9+HT_SHIFT))
 
+#define DRBD_MAX_SIZE_H80_PACKET (1 << 15) /* The old header only allows packets up to 32Kib data */
+
 /* Number of elements in the app_reads_hash */
 #define APP_R_HSIZE 15
 
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index f3f4ea9c5eb9..71c4c261573e 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2447,7 +2447,7 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
         dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
                 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
 
-        if (req->size <= (1 << 15)) {
+        if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
                 p.head.h80.magic   = BE_DRBD_MAGIC;
                 p.head.h80.command = cpu_to_be16(P_DATA);
                 p.head.h80.length  =
@@ -2518,7 +2518,7 @@ int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
         dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
                 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
 
-        if (e->size <= (1 << 15)) {
+        if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
                 p.head.h80.magic   = BE_DRBD_MAGIC;
                 p.head.h80.command = cpu_to_be16(cmd);
                 p.head.h80.length  =
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 6b35d41706e4..97fb2c2a7a57 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1063,7 +1063,9 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
         mdev->read_cnt = 0;
         mdev->writ_cnt = 0;
 
-        drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
+        drbd_setup_queue_param(mdev, mdev->state.conn == C_CONNECTED &&
+                               mdev->agreed_pro_version < 95 ?
+                               DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE);
 
         /* If I am currently not R_PRIMARY,
          * but meta data primary indicator is set,
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index fe308644a63c..4249117f1f67 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -925,6 +925,11 @@ retry:
 
         drbd_thread_start(&mdev->asender);
 
+        if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) {
+                drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET);
+                put_ldev(mdev);
+        }
+
         if (!drbd_send_protocol(mdev))
                 return -1;
         drbd_send_sync_param(mdev, &mdev->sync_conf);