tcmu: allow hw_max_sectors greater than 128

tcmu hard codes the hw_max_sectors to 128 which is a litle small.
Userspace uses the max_sectors to report the optimal IO size and
some initiators perform better with larger IOs (open-iscsi seems
to do better with 256 to 512 depending on the test).

(Fix do not display hw max sectors twice - MNC)

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 35 insertions, 19 deletions

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index c3adefe95e50..24e8580f07b8 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -960,7 +960,8 @@ static int tcmu_configure_device(struct se_device *dev)
         if (dev->dev_attrib.hw_block_size == 0)
                 dev->dev_attrib.hw_block_size = 512;
         /* Other attributes can be configured in userspace */
-        dev->dev_attrib.hw_max_sectors = 128;
+        if (!dev->dev_attrib.hw_max_sectors)
+                dev->dev_attrib.hw_max_sectors = 128;
         dev->dev_attrib.hw_queue_depth = 128;
 
         ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name,
@@ -1031,16 +1032,42 @@ static void tcmu_free_device(struct se_device *dev)
 }
 
 enum {
-        Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err,
+        Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors,
+        Opt_err,
 };
 
 static match_table_t tokens = {
         {Opt_dev_config, "dev_config=%s"},
         {Opt_dev_size, "dev_size=%u"},
         {Opt_hw_block_size, "hw_block_size=%u"},
+        {Opt_hw_max_sectors, "hw_max_sectors=%u"},
         {Opt_err, NULL}
 };
 
+static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib)
+{
+        unsigned long tmp_ul;
+        char *arg_p;
+        int ret;
+
+        arg_p = match_strdup(arg);
+        if (!arg_p)
+                return -ENOMEM;
+
+        ret = kstrtoul(arg_p, 0, &tmp_ul);
+        kfree(arg_p);
+        if (ret < 0) {
+                pr_err("kstrtoul() failed for dev attrib\n");
+                return ret;
+        }
+        if (!tmp_ul) {
+                pr_err("dev attrib must be nonzero\n");
+                return -EINVAL;
+        }
+        *dev_attrib = tmp_ul;
+        return 0;
+}
+
 static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
                 const char *page, ssize_t count)
 {
@@ -1048,7 +1075,6 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
         char *orig, *ptr, *opts, *arg_p;
         substring_t args[MAX_OPT_ARGS];
         int ret = 0, token;
-        unsigned long tmp_ul;
 
         opts = kstrdup(page, GFP_KERNEL);
         if (!opts)
@@ -1082,22 +1108,12 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
                                 pr_err("kstrtoul() failed for dev_size=\n");
                         break;
                 case Opt_hw_block_size:
-                        arg_p = match_strdup(&args[0]);
-                        if (!arg_p) {
-                                ret = -ENOMEM;
-                                break;
-                        }
-                        ret = kstrtoul(arg_p, 0, &tmp_ul);
-                        kfree(arg_p);
-                        if (ret < 0) {
-                                pr_err("kstrtoul() failed for hw_block_size=\n");
-                                break;
-                        }
-                        if (!tmp_ul) {
-                                pr_err("hw_block_size must be nonzero\n");
-                                break;
-                        }
-                        dev->dev_attrib.hw_block_size = tmp_ul;
+                        ret = tcmu_set_dev_attrib(&args[0],
+                                        &(dev->dev_attrib.hw_block_size));
+                        break;
+                case Opt_hw_max_sectors:
+                        ret = tcmu_set_dev_attrib(&args[0],
+                                        &(dev->dev_attrib.hw_max_sectors));
                         break;
                 default:
                         break;