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path: root/drivers/scsi/libfc/fc_disc.c
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Diffstat (limited to 'drivers/scsi/libfc/fc_disc.c')
-rw-r--r--drivers/scsi/libfc/fc_disc.c85
1 files changed, 43 insertions, 42 deletions
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index c48799e9dd8..9b0a5192a96 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -40,6 +40,8 @@
#include <scsi/libfc.h>
+#include "fc_libfc.h"
+
#define FC_DISC_RETRY_LIMIT 3 /* max retries */
#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */
@@ -51,8 +53,8 @@ static int fc_disc_single(struct fc_lport *, struct fc_disc_port *);
static void fc_disc_restart(struct fc_disc *);
/**
- * fc_disc_stop_rports() - delete all the remote ports associated with the lport
- * @disc: The discovery job to stop rports on
+ * fc_disc_stop_rports() - Delete all the remote ports associated with the lport
+ * @disc: The discovery job to stop remote ports on
*
* Locking Note: This function expects that the lport mutex is locked before
* calling it.
@@ -72,9 +74,9 @@ void fc_disc_stop_rports(struct fc_disc *disc)
/**
* fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN)
- * @sp: Current sequence of the RSCN exchange
- * @fp: RSCN Frame
- * @lport: Fibre Channel host port instance
+ * @sp: The sequence of the RSCN exchange
+ * @fp: The RSCN frame
+ * @lport: The local port that the request will be sent on
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
@@ -183,9 +185,9 @@ reject:
/**
* fc_disc_recv_req() - Handle incoming requests
- * @sp: Current sequence of the request exchange
- * @fp: The frame
- * @lport: The FC local port
+ * @sp: The sequence of the request exchange
+ * @fp: The request frame
+ * @lport: The local port receiving the request
*
* Locking Note: This function is called from the EM and will lock
* the disc_mutex before calling the handler for the
@@ -213,7 +215,7 @@ static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
/**
* fc_disc_restart() - Restart discovery
- * @lport: FC discovery context
+ * @disc: The discovery object to be restarted
*
* Locking Note: This function expects that the disc mutex
* is already locked.
@@ -240,9 +242,9 @@ static void fc_disc_restart(struct fc_disc *disc)
}
/**
- * fc_disc_start() - Fibre Channel Target discovery
- * @lport: FC local port
- * @disc_callback: function to be called when discovery is complete
+ * fc_disc_start() - Start discovery on a local port
+ * @lport: The local port to have discovery started on
+ * @disc_callback: Callback function to be called when discovery is complete
*/
static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
enum fc_disc_event),
@@ -263,8 +265,8 @@ static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
/**
* fc_disc_done() - Discovery has been completed
- * @disc: FC discovery context
- * @event: discovery completion status
+ * @disc: The discovery context
+ * @event: The discovery completion status
*
* Locking Note: This function expects that the disc mutex is locked before
* it is called. The discovery callback is then made with the lock released,
@@ -284,8 +286,8 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
}
/*
- * Go through all remote ports. If they were found in the latest
- * discovery, reverify or log them in. Otherwise, log them out.
+ * Go through all remote ports. If they were found in the latest
+ * discovery, reverify or log them in. Otherwise, log them out.
* Skip ports which were never discovered. These are the dNS port
* and ports which were created by PLOGI.
*/
@@ -305,8 +307,8 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
/**
* fc_disc_error() - Handle error on dNS request
- * @disc: FC discovery context
- * @fp: The frame pointer
+ * @disc: The discovery context
+ * @fp: The error code encoded as a frame pointer
*/
static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
{
@@ -342,7 +344,7 @@ static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
/**
* fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request
- * @lport: FC discovery context
+ * @lport: The discovery context
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
@@ -368,17 +370,17 @@ static void fc_disc_gpn_ft_req(struct fc_disc *disc)
if (lport->tt.elsct_send(lport, 0, fp,
FC_NS_GPN_FT,
fc_disc_gpn_ft_resp,
- disc, lport->e_d_tov))
+ disc, 3 * lport->r_a_tov))
return;
err:
- fc_disc_error(disc, fp);
+ fc_disc_error(disc, NULL);
}
/**
* fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response.
- * @lport: Fibre Channel host port instance
- * @buf: GPN_FT response buffer
- * @len: size of response buffer
+ * @lport: The local port the GPN_FT was received on
+ * @buf: The GPN_FT response buffer
+ * @len: The size of response buffer
*
* Goes through the list of IDs and names resulting from a request.
*/
@@ -477,10 +479,8 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
}
/**
- * fc_disc_timeout() - Retry handler for the disc component
- * @work: Structure holding disc obj that needs retry discovery
- *
- * Handle retry of memory allocation for remote ports.
+ * fc_disc_timeout() - Handler for discovery timeouts
+ * @work: Structure holding discovery context that needs to retry discovery
*/
static void fc_disc_timeout(struct work_struct *work)
{
@@ -494,9 +494,9 @@ static void fc_disc_timeout(struct work_struct *work)
/**
* fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT)
- * @sp: Current sequence of GPN_FT exchange
- * @fp: response frame
- * @lp_arg: Fibre Channel host port instance
+ * @sp: The sequence that the GPN_FT response was received on
+ * @fp: The GPN_FT response frame
+ * @lp_arg: The discovery context
*
* Locking Note: This function is called without disc mutex held, and
* should do all its processing with the mutex held
@@ -567,9 +567,9 @@ static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
/**
* fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID)
- * @sp: exchange sequence
- * @fp: response frame
- * @rdata_arg: remote port private data
+ * @sp: The sequence the GPN_ID is on
+ * @fp: The response frame
+ * @rdata_arg: The remote port that sent the GPN_ID response
*
* Locking Note: This function is called without disc mutex held.
*/
@@ -637,7 +637,7 @@ out:
/**
* fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request
- * @lport: local port
+ * @lport: The local port to initiate discovery on
* @rdata: remote port private data
*
* Locking Note: This function expects that the disc_mutex is locked
@@ -654,7 +654,8 @@ static int fc_disc_gpn_id_req(struct fc_lport *lport,
if (!fp)
return -ENOMEM;
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID,
- fc_disc_gpn_id_resp, rdata, lport->e_d_tov))
+ fc_disc_gpn_id_resp, rdata,
+ 3 * lport->r_a_tov))
return -ENOMEM;
kref_get(&rdata->kref);
return 0;
@@ -662,8 +663,8 @@ static int fc_disc_gpn_id_req(struct fc_lport *lport,
/**
* fc_disc_single() - Discover the directory information for a single target
- * @lport: local port
- * @dp: The port to rediscover
+ * @lport: The local port the remote port is associated with
+ * @dp: The port to rediscover
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
@@ -681,7 +682,7 @@ static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)
/**
* fc_disc_stop() - Stop discovery for a given lport
- * @lport: The lport that discovery should stop for
+ * @lport: The local port that discovery should stop on
*/
void fc_disc_stop(struct fc_lport *lport)
{
@@ -695,7 +696,7 @@ void fc_disc_stop(struct fc_lport *lport)
/**
* fc_disc_stop_final() - Stop discovery for a given lport
- * @lport: The lport that discovery should stop for
+ * @lport: The lport that discovery should stop on
*
* This function will block until discovery has been
* completely stopped and all rports have been deleted.
@@ -707,8 +708,8 @@ void fc_disc_stop_final(struct fc_lport *lport)
}
/**
- * fc_disc_init() - Initialize the discovery block
- * @lport: FC local port
+ * fc_disc_init() - Initialize the discovery layer for a local port
+ * @lport: The local port that needs the discovery layer to be initialized
*/
int fc_disc_init(struct fc_lport *lport)
{