!847 [OLK-5.10] net/smc: support cork option

Merge Pull Request from: @giree2 
 
backport cork patchset from upstream：
1. net/smc: Send directly when TCP_CORK is cleared
2. net/smc: Remove corked dealyed work
3. net/smc: Cork when sendpage with MSG_SENDPAGE_NOTLAST flag
4. net/smc: Add comment for smc_tx_pending
5. net/smc: Call trace_smc_tx_sendmsg when data corked
6. net/smc: add autocorking support
7. net/smc: send directly on setting TCP_NODELAY
8. net/smc: don't send in the BH context if sock_owned_by_user
9. net/smc: Send out the remaining data in sndbuf before close 
 
Link:https://gitee.com/openeuler/kernel/pulls/847

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>