libceph: do crc calculations outside loop
Move blocks of code out of loops in read_partial_message_section()
and read_partial_message(). They were only was getting called at
the end of the last iteration of the loop anyway.
Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 7ec6a22..575511a 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1544,10 +1544,9 @@
if (ret <= 0)
return ret;
section->iov_len += ret;
- if (section->iov_len == sec_len)
- *crc = crc32c(0, section->iov_base,
- section->iov_len);
}
+ if (section->iov_len == sec_len)
+ *crc = crc32c(0, section->iov_base, section->iov_len);
return 1;
}
@@ -1638,6 +1637,7 @@
bool do_datacrc = con->msgr->nocrc;
int skip;
u64 seq;
+ u32 crc;
dout("read_partial_message con %p msg %p\n", con, m);
@@ -1650,18 +1650,16 @@
if (ret <= 0)
return ret;
con->in_base_pos += ret;
- if (con->in_base_pos == sizeof(con->in_hdr)) {
- u32 crc = crc32c(0, &con->in_hdr,
- offsetof(struct ceph_msg_header, crc));
-
- if (cpu_to_le32(crc) != con->in_hdr.crc) {
- pr_err("read_partial_message bad hdr "
- " crc %u != expected %u\n",
- crc, con->in_hdr.crc);
- return -EBADMSG;
- }
- }
}
+
+ crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
+ if (cpu_to_le32(crc) != con->in_hdr.crc) {
+ pr_err("read_partial_message bad hdr "
+ " crc %u != expected %u\n",
+ crc, con->in_hdr.crc);
+ return -EBADMSG;
+ }
+
front_len = le32_to_cpu(con->in_hdr.front_len);
if (front_len > CEPH_MSG_MAX_FRONT_LEN)
return -EIO;