obj-$(CONFIG_SMC) += smc.o
obj-$(CONFIG_SMC_DIAG) += smc_diag.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_rx.o smc_close.o smc_ism.o smc_netlink.o
+smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
#include "smc_tx.h"
#include "smc_rx.h"
#include "smc_close.h"
+#include "smc_stats.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
link->peer_mtu = clc->r0.qp_mtu;
}
-static void smc_switch_to_fallback(struct smc_sock *smc)
+static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
+ struct smc_stats_fback *fback_arr)
+{
+ int cnt;
+
+ for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
+ if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
+ fback_arr[cnt].count++;
+ break;
+ }
+ if (!fback_arr[cnt].fback_code) {
+ fback_arr[cnt].fback_code = smc->fallback_rsn;
+ fback_arr[cnt].count++;
+ break;
+ }
+ }
+}
+
+static void smc_stat_fallback(struct smc_sock *smc)
+{
+ mutex_lock(&smc_stat_fback_rsn);
+ if (smc->listen_smc) {
+ smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.srv);
+ fback_rsn.srv_fback_cnt++;
+ } else {
+ smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.clnt);
+ fback_rsn.clnt_fback_cnt++;
+ }
+ mutex_unlock(&smc_stat_fback_rsn);
+}
+
+static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
{
smc->use_fallback = true;
+ smc->fallback_rsn = reason_code;
+ smc_stat_fallback(smc);
if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
smc->clcsock->file = smc->sk.sk_socket->file;
smc->clcsock->file->private_data = smc->clcsock;
/* fall back during connect */
static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
{
- smc_switch_to_fallback(smc);
- smc->fallback_rsn = reason_code;
+ smc_switch_to_fallback(smc, reason_code);
smc_copy_sock_settings_to_clc(smc);
smc->connect_nonblock = 0;
if (smc->sk.sk_state == SMC_INIT)
int rc;
if (reason_code < 0) { /* error, fallback is not possible */
+ this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
return reason_code;
if (reason_code != SMC_CLC_DECL_PEERDECL) {
rc = smc_clc_send_decline(smc, reason_code, version);
if (rc < 0) {
+ this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
return rc;
if (rc)
goto vlan_cleanup;
+ SMC_STAT_CLNT_SUCC_INC(aclc);
smc_connect_ism_vlan_cleanup(smc, ini);
kfree(buf);
kfree(ini);
{
struct sock *newsmcsk = &new_smc->sk;
+ this_cpu_inc(smc_stats->srv_hshake_err_cnt);
if (newsmcsk->sk_state == SMC_INIT)
sock_put(&new_smc->sk); /* passive closing */
newsmcsk->sk_state = SMC_CLOSED;
smc_listen_out_err(new_smc);
return;
}
- smc_switch_to_fallback(new_smc);
- new_smc->fallback_rsn = reason_code;
+ smc_switch_to_fallback(new_smc, reason_code);
if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
smc_listen_out_err(new_smc);
/* check if peer is smc capable */
if (!tcp_sk(newclcsock->sk)->syn_smc) {
- smc_switch_to_fallback(new_smc);
- new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
+ smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
smc_listen_out_connected(new_smc);
return;
}
}
smc_conn_save_peer_info(new_smc, cclc);
smc_listen_out_connected(new_smc);
+ SMC_STAT_SERV_SUCC_INC(ini);
goto out_free;
out_unlock:
if (msg->msg_flags & MSG_FASTOPEN) {
if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
- smc_switch_to_fallback(smc);
- smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
+ smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
} else {
rc = -EINVAL;
goto out;
}
}
- if (smc->use_fallback)
+ if (smc->use_fallback) {
rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
- else
+ } else {
rc = smc_tx_sendmsg(smc, msg, len);
+ SMC_STAT_TX_PAYLOAD(smc, len, rc);
+ }
out:
release_sock(sk);
return rc;
} else {
msg->msg_namelen = 0;
rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
+ SMC_STAT_RX_PAYLOAD(smc, rc, rc);
}
out:
case TCP_FASTOPEN_NO_COOKIE:
/* option not supported by SMC */
if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
- smc_switch_to_fallback(smc);
- smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
+ smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
} else {
rc = -EINVAL;
}
if (sk->sk_state != SMC_INIT &&
sk->sk_state != SMC_LISTEN &&
sk->sk_state != SMC_CLOSED) {
- if (val)
+ if (val) {
+ SMC_STAT_INC(!smc->conn.lnk, ndly_cnt);
mod_delayed_work(smc->conn.lgr->tx_wq,
&smc->conn.tx_work, 0);
+ }
}
break;
case TCP_CORK:
if (sk->sk_state != SMC_INIT &&
sk->sk_state != SMC_LISTEN &&
sk->sk_state != SMC_CLOSED) {
- if (!val)
+ if (!val) {
+ SMC_STAT_INC(!smc->conn.lnk, cork_cnt);
mod_delayed_work(smc->conn.lgr->tx_wq,
&smc->conn.tx_work, 0);
+ }
}
break;
case TCP_DEFER_ACCEPT:
goto out;
}
release_sock(sk);
- if (smc->use_fallback)
+ if (smc->use_fallback) {
rc = kernel_sendpage(smc->clcsock, page, offset,
size, flags);
- else
+ } else {
+ SMC_STAT_INC(!smc->conn.lnk, sendpage_cnt);
rc = sock_no_sendpage(sock, page, offset, size, flags);
+ }
out:
return rc;
flags = MSG_DONTWAIT;
else
flags = 0;
+ SMC_STAT_INC(!smc->conn.lnk, splice_cnt);
rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
}
out:
if (!smc_close_wq)
goto out_alloc_hs_wq;
+ rc = smc_stats_init();
+ if (rc) {
+ pr_err("%s: smc_stats_init fails with %d\n", __func__, rc);
+ goto out_alloc_wqs;
+ }
+
rc = smc_core_init();
if (rc) {
pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
- goto out_alloc_wqs;
+ goto out_smc_stat;
}
rc = smc_llc_init();
proto_unregister(&smc_proto);
out_core:
smc_core_exit();
+out_smc_stat:
+ smc_stats_exit();
out_alloc_wqs:
destroy_workqueue(smc_close_wq);
out_alloc_hs_wq:
smc_ib_unregister_client();
destroy_workqueue(smc_close_wq);
destroy_workqueue(smc_hs_wq);
+ smc_stats_exit();
proto_unregister(&smc_proto6);
proto_unregister(&smc_proto);
smc_pnet_exit();
#include "smc_close.h"
#include "smc_ism.h"
#include "smc_netlink.h"
+#include "smc_stats.h"
#define SMC_LGR_NUM_INCR 256
#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
struct smc_link_group *lgr = conn->lgr;
struct list_head *buf_list;
int bufsize, bufsize_short;
+ bool is_dgraded = false;
struct mutex *lock; /* lock buffer list */
int sk_buf_size;
/* check for reusable slot in the link group */
buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
if (buf_desc) {
+ SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
+ SMC_STAT_BUF_REUSE(is_smcd, is_rmb);
memset(buf_desc->cpu_addr, 0, bufsize);
break; /* found reusable slot */
}
if (PTR_ERR(buf_desc) == -ENOMEM)
break;
- if (IS_ERR(buf_desc))
+ if (IS_ERR(buf_desc)) {
+ if (!is_dgraded) {
+ is_dgraded = true;
+ SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rmb);
+ }
continue;
+ }
+ SMC_STAT_RMB_ALLOC(is_smcd, is_rmb);
+ SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
buf_desc->used = 1;
mutex_lock(lock);
list_add(&buf_desc->list, buf_list);
#include "smc_cdc.h"
#include "smc_tx.h" /* smc_tx_consumer_update() */
#include "smc_rx.h"
+#include "smc_stats.h"
/* callback implementation to wakeup consumers blocked with smc_rx_wait().
* indirectly called by smc_cdc_msg_recv_action().
conn->urg_state == SMC_URG_READ)
return -EINVAL;
+ SMC_STAT_INC(!conn->lnk, urg_data_cnt);
if (conn->urg_state == SMC_URG_VALID) {
if (!(flags & MSG_PEEK))
smc->conn.urg_state = SMC_URG_READ;
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
+ readable = atomic_read(&conn->bytes_to_rcv);
+ if (readable >= conn->rmb_desc->len)
+ SMC_STAT_RMB_RX_FULL(!conn->lnk);
+
+ if (len < readable)
+ SMC_STAT_RMB_RX_SIZE_SMALL(!conn->lnk);
/* we currently use 1 RMBE per RMB, so RMBE == RMB base addr */
rcvbuf_base = conn->rx_off + conn->rmb_desc->cpu_addr;
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * SMC statistics netlink routines
+ *
+ * Copyright IBM Corp. 2021
+ *
+ * Author(s): Guvenc Gulce
+ */
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/ctype.h>
+#include "smc_stats.h"
+
+/* serialize fallback reason statistic gathering */
+DEFINE_MUTEX(smc_stat_fback_rsn);
+struct smc_stats __percpu *smc_stats; /* per cpu counters for SMC */
+struct smc_stats_reason fback_rsn;
+
+int __init smc_stats_init(void)
+{
+ memset(&fback_rsn, 0, sizeof(fback_rsn));
+ smc_stats = alloc_percpu(struct smc_stats);
+ if (!smc_stats)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void smc_stats_exit(void)
+{
+ free_percpu(smc_stats);
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * Macros for SMC statistics
+ *
+ * Copyright IBM Corp. 2021
+ *
+ * Author(s): Guvenc Gulce
+ */
+
+#ifndef NET_SMC_SMC_STATS_H_
+#define NET_SMC_SMC_STATS_H_
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/ctype.h>
+#include <linux/smc.h>
+
+#include "smc_clc.h"
+
+#define SMC_MAX_FBACK_RSN_CNT 30
+
+extern struct smc_stats __percpu *smc_stats; /* per cpu counters for SMC */
+extern struct smc_stats_reason fback_rsn;
+extern struct mutex smc_stat_fback_rsn;
+
+enum {
+ SMC_BUF_8K,
+ SMC_BUF_16K,
+ SMC_BUF_32K,
+ SMC_BUF_64K,
+ SMC_BUF_128K,
+ SMC_BUF_256K,
+ SMC_BUF_512K,
+ SMC_BUF_1024K,
+ SMC_BUF_G_1024K,
+ SMC_BUF_MAX,
+};
+
+struct smc_stats_fback {
+ int fback_code;
+ u16 count;
+};
+
+struct smc_stats_reason {
+ struct smc_stats_fback srv[SMC_MAX_FBACK_RSN_CNT];
+ struct smc_stats_fback clnt[SMC_MAX_FBACK_RSN_CNT];
+ u64 srv_fback_cnt;
+ u64 clnt_fback_cnt;
+};
+
+struct smc_stats_rmbcnt {
+ u64 buf_size_small_peer_cnt;
+ u64 buf_size_small_cnt;
+ u64 buf_full_peer_cnt;
+ u64 buf_full_cnt;
+ u64 reuse_cnt;
+ u64 alloc_cnt;
+ u64 dgrade_cnt;
+};
+
+struct smc_stats_memsize {
+ u64 buf[SMC_BUF_MAX];
+};
+
+struct smc_stats_tech {
+ struct smc_stats_memsize tx_rmbsize;
+ struct smc_stats_memsize rx_rmbsize;
+ struct smc_stats_memsize tx_pd;
+ struct smc_stats_memsize rx_pd;
+ struct smc_stats_rmbcnt rmb_tx;
+ struct smc_stats_rmbcnt rmb_rx;
+ u64 clnt_v1_succ_cnt;
+ u64 clnt_v2_succ_cnt;
+ u64 srv_v1_succ_cnt;
+ u64 srv_v2_succ_cnt;
+ u64 sendpage_cnt;
+ u64 urg_data_cnt;
+ u64 splice_cnt;
+ u64 cork_cnt;
+ u64 ndly_cnt;
+ u64 rx_bytes;
+ u64 tx_bytes;
+ u64 rx_cnt;
+ u64 tx_cnt;
+};
+
+struct smc_stats {
+ struct smc_stats_tech smc[2];
+ u64 clnt_hshake_err_cnt;
+ u64 srv_hshake_err_cnt;
+};
+
+#define SMC_STAT_PAYLOAD_SUB(_tech, key, _len, _rc) \
+do { \
+ typeof(_tech) t = (_tech); \
+ typeof(_len) l = (_len); \
+ int _pos = fls64((l) >> 13); \
+ typeof(_rc) r = (_rc); \
+ int m = SMC_BUF_MAX - 1; \
+ this_cpu_inc((*smc_stats).smc[t].key ## _cnt); \
+ if (r <= 0) \
+ break; \
+ _pos = (_pos < m) ? ((l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
+ this_cpu_inc((*smc_stats).smc[t].key ## _pd.buf[_pos]); \
+ this_cpu_add((*smc_stats).smc[t].key ## _bytes, r); \
+} \
+while (0)
+
+#define SMC_STAT_TX_PAYLOAD(_smc, length, rcode) \
+do { \
+ typeof(_smc) __smc = _smc; \
+ typeof(length) _len = (length); \
+ typeof(rcode) _rc = (rcode); \
+ bool is_smcd = !__smc->conn.lnk; \
+ if (is_smcd) \
+ SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, tx, _len, _rc); \
+ else \
+ SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, tx, _len, _rc); \
+} \
+while (0)
+
+#define SMC_STAT_RX_PAYLOAD(_smc, length, rcode) \
+do { \
+ typeof(_smc) __smc = _smc; \
+ typeof(length) _len = (length); \
+ typeof(rcode) _rc = (rcode); \
+ bool is_smcd = !__smc->conn.lnk; \
+ if (is_smcd) \
+ SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, rx, _len, _rc); \
+ else \
+ SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, rx, _len, _rc); \
+} \
+while (0)
+
+#define SMC_STAT_RMB_SIZE_SUB(_tech, k, _len) \
+do { \
+ typeof(_len) _l = (_len); \
+ typeof(_tech) t = (_tech); \
+ int _pos = fls((_l) >> 13); \
+ int m = SMC_BUF_MAX - 1; \
+ _pos = (_pos < m) ? ((_l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
+ this_cpu_inc((*smc_stats).smc[t].k ## _rmbsize.buf[_pos]); \
+} \
+while (0)
+
+#define SMC_STAT_RMB_SUB(type, t, key) \
+ this_cpu_inc((*smc_stats).smc[t].rmb ## _ ## key.type ## _cnt)
+
+#define SMC_STAT_RMB_SIZE(_is_smcd, _is_rx, _len) \
+do { \
+ typeof(_is_smcd) is_d = (_is_smcd); \
+ typeof(_is_rx) is_r = (_is_rx); \
+ typeof(_len) l = (_len); \
+ if ((is_d) && (is_r)) \
+ SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, rx, l); \
+ if ((is_d) && !(is_r)) \
+ SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, tx, l); \
+ if (!(is_d) && (is_r)) \
+ SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, rx, l); \
+ if (!(is_d) && !(is_r)) \
+ SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, tx, l); \
+} \
+while (0)
+
+#define SMC_STAT_RMB(type, _is_smcd, _is_rx) \
+do { \
+ typeof(_is_smcd) is_d = (_is_smcd); \
+ typeof(_is_rx) is_r = (_is_rx); \
+ if ((is_d) && (is_r)) \
+ SMC_STAT_RMB_SUB(type, SMC_TYPE_D, rx); \
+ if ((is_d) && !(is_r)) \
+ SMC_STAT_RMB_SUB(type, SMC_TYPE_D, tx); \
+ if (!(is_d) && (is_r)) \
+ SMC_STAT_RMB_SUB(type, SMC_TYPE_R, rx); \
+ if (!(is_d) && !(is_r)) \
+ SMC_STAT_RMB_SUB(type, SMC_TYPE_R, tx); \
+} \
+while (0)
+
+#define SMC_STAT_BUF_REUSE(is_smcd, is_rx) \
+ SMC_STAT_RMB(reuse, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_ALLOC(is_smcd, is_rx) \
+ SMC_STAT_RMB(alloc, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rx) \
+ SMC_STAT_RMB(dgrade, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_TX_PEER_FULL(is_smcd) \
+ SMC_STAT_RMB(buf_full_peer, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_FULL(is_smcd) \
+ SMC_STAT_RMB(buf_full, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_PEER_SIZE_SMALL(is_smcd) \
+ SMC_STAT_RMB(buf_size_small_peer, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_SIZE_SMALL(is_smcd) \
+ SMC_STAT_RMB(buf_size_small, is_smcd, false)
+
+#define SMC_STAT_RMB_RX_SIZE_SMALL(is_smcd) \
+ SMC_STAT_RMB(buf_size_small, is_smcd, true)
+
+#define SMC_STAT_RMB_RX_FULL(is_smcd) \
+ SMC_STAT_RMB(buf_full, is_smcd, true)
+
+#define SMC_STAT_INC(is_smcd, type) \
+do { \
+ if ((is_smcd)) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_D].type); \
+ else \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_R].type); \
+} \
+while (0)
+
+#define SMC_STAT_CLNT_SUCC_INC(_aclc) \
+do { \
+ typeof(_aclc) acl = (_aclc); \
+ bool is_v2 = (acl->hdr.version == SMC_V2); \
+ bool is_smcd = (acl->hdr.typev1 == SMC_TYPE_D); \
+ if (is_v2 && is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_D].clnt_v2_succ_cnt); \
+ else if (is_v2 && !is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_R].clnt_v2_succ_cnt); \
+ else if (!is_v2 && is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_D].clnt_v1_succ_cnt); \
+ else if (!is_v2 && !is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_R].clnt_v1_succ_cnt); \
+} \
+while (0)
+
+#define SMC_STAT_SERV_SUCC_INC(_ini) \
+do { \
+ typeof(_ini) i = (_ini); \
+ bool is_v2 = (i->smcd_version & SMC_V2); \
+ bool is_smcd = (i->is_smcd); \
+ if (is_v2 && is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v2_succ_cnt); \
+ else if (is_v2 && !is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_R].srv_v2_succ_cnt); \
+ else if (!is_v2 && is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v1_succ_cnt); \
+ else if (!is_v2 && !is_smcd) \
+ this_cpu_inc(smc_stats->smc[SMC_TYPE_R].srv_v1_succ_cnt); \
+} \
+while (0)
+
+int smc_stats_init(void) __init;
+void smc_stats_exit(void);
+
+#endif /* NET_SMC_SMC_STATS_H_ */
#include "smc_close.h"
#include "smc_ism.h"
#include "smc_tx.h"
+#include "smc_stats.h"
#define SMC_TX_WORK_DELAY 0
#define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */
/* similar to sk_stream_write_space */
if (atomic_read(&smc->conn.sndbuf_space) && sock) {
+ if (test_bit(SOCK_NOSPACE, &sock->flags))
+ SMC_STAT_RMB_TX_FULL(!smc->conn.lnk);
clear_bit(SOCK_NOSPACE, &sock->flags);
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
goto out_err;
}
+ if (len > conn->sndbuf_desc->len)
+ SMC_STAT_RMB_TX_SIZE_SMALL(!conn->lnk);
+
+ if (len > conn->peer_rmbe_size)
+ SMC_STAT_RMB_TX_PEER_SIZE_SMALL(!conn->lnk);
+
+ if (msg->msg_flags & MSG_OOB)
+ SMC_STAT_INC(!conn->lnk, urg_data_cnt);
+
while (msg_data_left(msg)) {
if (sk->sk_state == SMC_INIT)
return -ENOTCONN;
/* destination: RMBE */
/* cf. snd_wnd */
rmbespace = atomic_read(&conn->peer_rmbe_space);
- if (rmbespace <= 0)
+ if (rmbespace <= 0) {
+ SMC_STAT_RMB_TX_PEER_FULL(!conn->lnk);
return 0;
+ }
smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
projects / platform / kernel / linux-rpi.git / commitdiff