hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'smc-fixes' 

Ursula Braun says:

====================
net/smc: fixes 2018/05/03

here are smc fixes for 2 problems:
 * receive buffers in SMC must be registered. If registration fails
   these buffers must not be kept within the link group for reuse.
   Patch 1 is a preparational patch; patch 2 contains the fix.
 * sendpage: do not hold the sock lock when calling kernel_sendpage()
             or sock_no_sendpage()
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-05-03 14:47:32 -04:00
parent df80b8fb3c bda27ff5c4
commit 31140b47fe
3 changed files with 42 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
net/smc/af_smc.c
View File

@ -292,6 +292,17 @@ static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
}
/* register a new rmb */
static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
{
/* register memory region for new rmb */
if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
rmb_desc->regerr = 1;
return -EFAULT;
}
return 0;
}
static int smc_clnt_conf_first_link(struct smc_sock *smc)
{
struct smc_link_group *lgr = smc->conn.lgr;
@ -321,9 +332,7 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
smc_wr_remember_qp_attr(link);
rc = smc_wr_reg_send(link,
smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
if (rc)
if (smc_reg_rmb(link, smc->conn.rmb_desc))
return SMC_CLC_DECL_INTERR;
/* send CONFIRM LINK response over RoCE fabric */
@ -473,13 +482,8 @@ static int smc_connect_rdma(struct smc_sock *smc)
goto decline_rdma_unlock;
}
} else {
struct smc_buf_desc *buf_desc = smc->conn.rmb_desc;
if (!buf_desc->reused) {
/* register memory region for new rmb */
rc = smc_wr_reg_send(link,
buf_desc->mr_rx[SMC_SINGLE_LINK]);
if (rc) {
if (!smc->conn.rmb_desc->reused) {
if (smc_reg_rmb(link, smc->conn.rmb_desc)) {
reason_code = SMC_CLC_DECL_INTERR;
goto decline_rdma_unlock;
}
@ -719,9 +723,7 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
link = &lgr->lnk[SMC_SINGLE_LINK];
rc = smc_wr_reg_send(link,
smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
if (rc)
if (smc_reg_rmb(link, smc->conn.rmb_desc))
return SMC_CLC_DECL_INTERR;
/* send CONFIRM LINK request to client over the RoCE fabric */
@ -854,13 +856,8 @@ static void smc_listen_work(struct work_struct *work)
smc_rx_init(new_smc);
if (local_contact != SMC_FIRST_CONTACT) {
struct smc_buf_desc *buf_desc = new_smc->conn.rmb_desc;
if (!buf_desc->reused) {
/* register memory region for new rmb */
rc = smc_wr_reg_send(link,
buf_desc->mr_rx[SMC_SINGLE_LINK]);
if (rc) {
if (!new_smc->conn.rmb_desc->reused) {
if (smc_reg_rmb(link, new_smc->conn.rmb_desc)) {
reason_code = SMC_CLC_DECL_INTERR;
goto decline_rdma_unlock;
}
@ -1318,8 +1315,11 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
smc = smc_sk(sk);
lock_sock(sk);
if (sk->sk_state != SMC_ACTIVE)
if (sk->sk_state != SMC_ACTIVE) {
release_sock(sk);
goto out;
}
release_sock(sk);
if (smc->use_fallback)
rc = kernel_sendpage(smc->clcsock, page, offset,
size, flags);
@ -1327,7 +1327,6 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
rc = sock_no_sendpage(sock, page, offset, size, flags);
out:
release_sock(sk);
return rc;
}

22
net/smc/smc_core.c
View File

@ -32,6 +32,9 @@
static u32 smc_lgr_num; /* unique link group number */
static void smc_buf_free(struct smc_buf_desc *buf_desc, struct smc_link *lnk,
bool is_rmb);
static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
{
/* client link group creation always follows the server link group
@ -234,9 +237,22 @@ static void smc_buf_unuse(struct smc_connection *conn)
conn->sndbuf_size = 0;
}
if (conn->rmb_desc) {
conn->rmb_desc->reused = true;
conn->rmb_desc->used = 0;
conn->rmbe_size = 0;
if (!conn->rmb_desc->regerr) {
conn->rmb_desc->reused = 1;
conn->rmb_desc->used = 0;
conn->rmbe_size = 0;
} else {
/* buf registration failed, reuse not possible */
struct smc_link_group *lgr = conn->lgr;
struct smc_link *lnk;
write_lock_bh(&lgr->rmbs_lock);
list_del(&conn->rmb_desc->list);
write_unlock_bh(&lgr->rmbs_lock);
lnk = &lgr->lnk[SMC_SINGLE_LINK];
smc_buf_free(conn->rmb_desc, lnk, true);
}
}
}

3
net/smc/smc_core.h
View File

@ -123,7 +123,8 @@ struct smc_buf_desc {
*/
u32 order; /* allocation order */
u32 used; /* currently used / unused */
bool reused; /* new created / reused */
u8 reused : 1; /* new created / reused */
u8 regerr : 1; /* err during registration */
};
struct smc_rtoken { /* address/key of remote RMB */