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Commit 31140b47 authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parents df80b8fb bda27ff5

net/smc/af_smc.c

+21 −22
Original line number Diff line number Diff line
@@ -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;

}

net/smc/smc_core.c

+19 −3
Original line number Diff line number Diff line
@@ -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;

		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);

		}

	}

}

net/smc/smc_core.h

+2 −1
Original line number Diff line number Diff line
@@ -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 */