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Commit 952310cc authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

smc: receive data from RMBE 



move RMBE data into user space buffer and update managing cursors

Signed-off-by: default avatarUrsula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e6727f39

net/smc/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_SMC)	+= smc.o

smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o

smc-y += smc_cdc.o smc_tx.o
 
smc-y += smc_cdc.o smc_tx.o smc_rx.o

net/smc/af_smc.c

+6 −1
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#include "smc_ib.h"

#include "smc_pnet.h"

#include "smc_tx.h"

#include "smc_rx.h"



static DEFINE_MUTEX(smc_create_lgr_pending);	/* serialize link group

						 * creation
@@ -412,6 +413,7 @@ static int smc_connect_rdma(struct smc_sock *smc) 


	mutex_unlock(&smc_create_lgr_pending);

	smc_tx_init(smc);

	smc_rx_init(smc);



out_connected:

	smc_copy_sock_settings_to_clc(smc);
@@ -755,6 +757,7 @@ static void smc_listen_work(struct work_struct *work) 
	}



	smc_tx_init(new_smc);

	smc_rx_init(new_smc);



out_connected:

	sk_refcnt_debug_inc(newsmcsk);
@@ -950,7 +953,7 @@ static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 
	if (smc->use_fallback)

		rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);

	else

		rc = sock_no_recvmsg(sock, msg, len, flags);

		rc = smc_rx_recvmsg(smc, msg, len, flags);

out:

	release_sock(sk);

	return rc;
@@ -1016,6 +1019,8 @@ static unsigned int smc_poll(struct file *file, struct socket *sock, 
			sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);

			set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);

		}

		if (atomic_read(&smc->conn.bytes_to_rcv))

			mask |= POLLIN | POLLRDNORM;

		/* for now - to be enhanced in follow-on patch */

	}

net/smc/smc.h

+4 −0
Original line number Diff line number Diff line
@@ -115,6 +115,10 @@ struct smc_connection { 
	struct smc_buf_desc	*rmb_desc;	/* RMBE descriptor */

	int			rmbe_size;	/* RMBE size <== sock rmem */

	int			rmbe_size_short;/* compressed notation */

	int			rmbe_update_limit;

						/* lower limit for consumer

						 * cursor update

						 */



	struct smc_host_cdc_msg	local_tx_ctrl;	/* host byte order staging

						 * buffer for CDC msg send

net/smc/smc_cdc.c

+5 −1
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include "smc_wr.h"

#include "smc_cdc.h"

#include "smc_tx.h"

#include "smc_rx.h"



/********************************** send *************************************/
@@ -197,6 +198,7 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, 
		atomic_add(diff_prod, &conn->bytes_to_rcv);

		/* guarantee 0 <= bytes_to_rcv <= rmbe_size */

		smp_mb__after_atomic();

		smc->sk.sk_data_ready(&smc->sk);

	}



	if (conn->local_rx_ctrl.conn_state_flags.peer_conn_abort)
@@ -216,7 +218,9 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, 
		return;



	/* data available */

	/* subsequent patch: send delayed ack, wake receivers */

	if ((conn->local_rx_ctrl.prod_flags.write_blocked) ||

	    (conn->local_rx_ctrl.prod_flags.cons_curs_upd_req))

		smc_tx_consumer_update(conn);

}



/* called under tasklet context */

net/smc/smc_core.c

+10 −0
Original line number Diff line number Diff line
@@ -489,6 +489,15 @@ struct smc_buf_desc *smc_rmb_get_slot(struct smc_link_group *lgr, 
	return NULL;

}



/* one of the conditions for announcing a receiver's current window size is

 * that it "results in a minimum increase in the window size of 10% of the

 * receive buffer space" [RFC7609]

 */

static inline int smc_rmb_wnd_update_limit(int rmbe_size)

{

	return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);

}



/* create the tx buffer for an SMC socket */

int smc_sndbuf_create(struct smc_sock *smc)

{
@@ -620,6 +629,7 @@ int smc_rmb_create(struct smc_sock *smc) 
		conn->rmbe_size_short = tmp_bufsize_short;

		smc->sk.sk_rcvbuf = tmp_bufsize * 2;

		atomic_set(&conn->bytes_to_rcv, 0);

		conn->rmbe_update_limit = smc_rmb_wnd_update_limit(tmp_bufsize);

		return 0;

	} else {

		return -ENOMEM;