anolis: net/smc: do not send msg in receiving process when tx is not blocked.

anolis inclusion
from anolis-devel-5.10
commit 3806a340553e7d27229df4b0a86c77b334783d3a
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I77V5Z
CVE: NA

Reference: https://gitee.com/anolis/cloud-kernel/commit/3806a340553e7d27229df4b0a86c77b334783d3a



--------------------------------

ANBZ: #1742

As user send thread(normal send path) and tx completion tasklet(corked
send path) will send msgs, there is no need to send msg in recv completion
tasklet when RMB's ci updated and smc_tx_prepared_sends, which may slower
the recv performance as recv completion tasklet is shared by multiple
connections, but write_blocked condition.

In netty benchamrk, show 28% improvement in throughput:

Before:
                                  throughput   cpu      sys    usr
thread-480 connect-48 len-8:      1653807.614 124.755 69.0489 55.7061

After:
                                  throughput   cpu      sys    usr
thread-480 connect-48 len-8:      2113879.617 132.117 67.9467 64.1707

Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Acked-by: Tony Lu <tonylu@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/577


Signed-off-by: Yingyu Zeng <zengyingyu@sangfor.com.cn>