cnic: Defer iscsi connection cleanup

The bnx2x devices require a 2 second quiet time before sending the last
RAMROD command to destroy a connection.  This sleep wait adds up to a
long delay when iscsid is serially destroying maultiple connections.

Create a workqueue to perform the final connection cleanup in the
background to speed up the process.  This significantly speeds up the
process as the wait time can be done in parallel for multiple connections.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/cnic.h b/drivers/net/cnic.h
index 9907cc24807a..47cd801af857 100644
--- a/drivers/net/cnic.h
+++ b/drivers/net/cnic.h
@@ -170,6 +170,7 @@ struct cnic_context {
         unsigned long           timestamp;
         unsigned long           ctx_flags;
 #define CTX_FL_OFFLD_START      0
+#define CTX_FL_DELETE_WAIT      1
         u8                      ulp_proto_id;
         union {
                 struct cnic_iscsi       *iscsi;
@@ -287,6 +288,8 @@ struct cnic_local {
         int                     hq_size;
         int                     num_cqs;
 
+        struct delayed_work     delete_task;
+
         struct cnic_ctx         *ctx_arr;
         int                     ctx_blks;
         int                     ctx_blk_size;