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path: root/drivers/scsi/bnx2i/bnx2i_sysfs.c
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Diffstat (limited to 'drivers/scsi/bnx2i/bnx2i_sysfs.c')
-rw-r--r--drivers/scsi/bnx2i/bnx2i_sysfs.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/scsi/bnx2i/bnx2i_sysfs.c b/drivers/scsi/bnx2i/bnx2i_sysfs.c
new file mode 100644
index 000000000000..96426b751eb2
--- /dev/null
+++ b/drivers/scsi/bnx2i/bnx2i_sysfs.c
@@ -0,0 +1,142 @@
+/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
+ *
+ * Copyright (c) 2004 - 2009 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
+ */
+
+#include "bnx2i.h"
+
+/**
+ * bnx2i_dev_to_hba - maps dev pointer to adapter struct
+ * @dev: device pointer
+ *
+ * Map device to hba structure
+ */
+static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ return iscsi_host_priv(shost);
+}
+
+
+/**
+ * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
+ * @dev: device pointer
+ * @buf: buffer to return current SQ size parameter
+ *
+ * Returns current SQ size parameter, this paramater determines the number
+ * outstanding iSCSI commands supported on a connection
+ */
+static ssize_t bnx2i_show_sq_info(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
+
+ return sprintf(buf, "0x%x\n", hba->max_sqes);
+}
+
+
+/**
+ * bnx2i_set_sq_info - update send queue (SQ) size parameter
+ * @dev: device pointer
+ * @buf: buffer to return current SQ size parameter
+ * @count: parameter buffer size
+ *
+ * Interface for user to change shared queue size allocated for each conn
+ * Must be within SQ limits and a power of 2. For the latter this is needed
+ * because of how libiscsi preallocates tasks.
+ */
+static ssize_t bnx2i_set_sq_info(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
+ u32 val;
+ int max_sq_size;
+
+ if (hba->ofld_conns_active)
+ goto skip_config;
+
+ if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
+ max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
+ else
+ max_sq_size = BNX2I_570X_SQ_WQES_MAX;
+
+ if (sscanf(buf, " 0x%x ", &val) > 0) {
+ if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
+ (is_power_of_2(val)))
+ hba->max_sqes = val;
+ }
+
+ return count;
+
+skip_config:
+ printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
+ return 0;
+}
+
+
+/**
+ * bnx2i_show_ccell_info - returns command cell (HQ) size
+ * @dev: device pointer
+ * @buf: buffer to return current SQ size parameter
+ *
+ * returns per-connection TCP history queue size parameter
+ */
+static ssize_t bnx2i_show_ccell_info(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
+
+ return sprintf(buf, "0x%x\n", hba->num_ccell);
+}
+
+
+/**
+ * bnx2i_get_link_state - set command cell (HQ) size
+ * @dev: device pointer
+ * @buf: buffer to return current SQ size parameter
+ * @count: parameter buffer size
+ *
+ * updates per-connection TCP history queue size parameter
+ */
+static ssize_t bnx2i_set_ccell_info(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u32 val;
+ struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
+
+ if (hba->ofld_conns_active)
+ goto skip_config;
+
+ if (sscanf(buf, " 0x%x ", &val) > 0) {
+ if ((val >= BNX2I_CCELLS_MIN) &&
+ (val <= BNX2I_CCELLS_MAX)) {
+ hba->num_ccell = val;
+ }
+ }
+
+ return count;
+
+skip_config:
+ printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
+ return 0;
+}
+
+
+static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
+ bnx2i_show_sq_info, bnx2i_set_sq_info);
+static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
+ bnx2i_show_ccell_info, bnx2i_set_ccell_info);
+
+struct device_attribute *bnx2i_dev_attributes[] = {
+ &dev_attr_sq_size,
+ &dev_attr_num_ccell,
+ NULL
+};