net/ncsi: Rework request index allocation

The NCSI request index (struct ncsi_request::id) is put into instance
ID (IID) field while sending NCSI command packet. It was designed the
available IDs are given in round-robin fashion. @ndp->request_id was
introduced to represent the next available ID, but it has been used
as number of successively allocated IDs. It breaks the round-robin
design. Besides, we shouldn't put 0 to NCSI command packet's IID
field, meaning ID#0 should be reserved according section 6.3.1.1
in NCSI spec (v1.1.0).

This fixes above two issues. With it applied, the available IDs will
be assigned in round-robin fashion and ID#0 won't be assigned.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
index 66dc851d49ee..c956fe8d80c3 100644
--- a/net/ncsi/internal.h
+++ b/net/ncsi/internal.h
@@ -259,6 +259,7 @@ struct ncsi_dev_priv {
         struct list_head    packages;        /* List of packages           */
         struct ncsi_request requests[256];   /* Request table              */
         unsigned int        request_id;      /* Last used request ID       */
+#define NCSI_REQ_START_IDX      1
         unsigned int        pending_req_num; /* Number of pending requests */
         struct ncsi_package *active_package; /* Currently handled package  */
         struct ncsi_channel *active_channel; /* Currently handled channel  */