[PATCH v2] net/ncsi: Ensure 32-bit boundary for data cksum

[Terry S. Duncan]

The NCSI spec indicates that if the data does not end on a 32 bit
boundary, one to three padding bytes equal to 0x00 shall be present to
align the checksum field to a 32-bit boundary.

Signed-off-by: Terry S. Duncan <terry.s.dun...@linux.intel.com>
---
 net/ncsi/ncsi-cmd.c | 2 +-
 net/ncsi/ncsi-rsp.c | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/ncsi/ncsi-cmd.c b/net/ncsi/ncsi-cmd.c
index 5c3fad8cba57..eab4346b0a39 100644
--- a/net/ncsi/ncsi-cmd.c
+++ b/net/ncsi/ncsi-cmd.c
@@ -54,7 +54,7 @@ static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
        checksum = ncsi_calculate_checksum((unsigned char *)h,
                                           sizeof(*h) + nca->payload);
        pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
-                   nca->payload);
+                   ALIGN(nca->payload, 4));
        *pchecksum = htonl(checksum);
 }
 
diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
index 7581bf919885..d876bd55f356 100644
--- a/net/ncsi/ncsi-rsp.c
+++ b/net/ncsi/ncsi-rsp.c
@@ -47,7 +47,8 @@ static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
        if (ntohs(h->code) != NCSI_PKT_RSP_C_COMPLETED ||
            ntohs(h->reason) != NCSI_PKT_RSP_R_NO_ERROR) {
                netdev_dbg(nr->ndp->ndev.dev,
-                          "NCSI: non zero response/reason code\n");
+                          "NCSI: non zero response/reason code %04xh, %04xh\n",
+                           ntohs(h->code), ntohs(h->reason));
                return -EPERM;
        }
 
@@ -55,7 +56,7 @@ static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
         * sender doesn't support checksum according to NCSI
         * specification.
         */
-       pchecksum = (__be32 *)((void *)(h + 1) + payload - 4);
+       pchecksum = (__be32 *)((void *)(h + 1) + ALIGN(payload, 4) - 4);
        if (ntohl(*pchecksum) == 0)
                return 0;
 
@@ -63,7 +64,9 @@ static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
                                           sizeof(*h) + payload - 4);
 
        if (*pchecksum != htonl(checksum)) {
-               netdev_dbg(nr->ndp->ndev.dev, "NCSI: checksum mismatched\n");
+               netdev_dbg(nr->ndp->ndev.dev,
+                          "NCSI: checksum mismatched; recd: %08x calc: %08x\n",
+                          *pchecksum, htonl(checksum));
                return -EINVAL;
        }
 
-- 
2.17.1