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Message-Id: <8141fcfee019b709046f0eaa08285c7302873b51.1451558672.git.tst@schoebel-theuer.de>
Date: Thu, 31 Dec 2015 12:36:09 +0100
From: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To: linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 14/31] mars: add new module xio_net
Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
drivers/staging/mars/xio_bricks/xio_net.c | 1830 +++++++++++++++++++++++++++++
include/linux/xio/xio_net.h | 171 +++
2 files changed, 2001 insertions(+)
create mode 100644 drivers/staging/mars/xio_bricks/xio_net.c
create mode 100644 include/linux/xio/xio_net.h
diff --git a/drivers/staging/mars/xio_bricks/xio_net.c b/drivers/staging/mars/xio_bricks/xio_net.c
new file mode 100644
index 0000000..dcc443c
--- /dev/null
+++ b/drivers/staging/mars/xio_bricks/xio_net.c
@@ -0,0 +1,1830 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/moduleparam.h>
+#include <linux/lzo.h>
+#include <linux/utsname.h>
+
+#include <linux/xio/xio.h>
+#include <linux/xio/xio_net.h>
+
+/******************************************************************/
+
+/* provisionary version detection */
+
+#ifndef TCP_MAX_REORDERING
+#define __HAS_IOV_ITER
+#endif
+
+#ifdef sk_net_refcnt
+/* see eeb1bd5c40edb0e2fd925c8535e2fdebdbc5cef2 */
+#define __HAS_STRUCT_NET
+#endif
+
+/******************************************************************/
+
+#define USE_BUFFERING
+
+#define SEND_PROTO_VERSION 2
+
+enum COMPRESS_TYPES {
+ COMPRESS_NONE = 0,
+ COMPRESS_LZO = 1,
+ /* insert further methods here */
+};
+
+int xio_net_compress_data;
+
+const u16 net_global_flags = 0
+#ifdef __HAVE_LZO
+ | COMPRESS_LZO
+#endif
+ ;
+
+/******************************************************************/
+
+/* Internal data structures for low-level transfer of C structures
+ * described by struct meta.
+ * Only these low-level fields need to have a fixed size like s64.
+ * The size and bytesex of the higher-level C structures is converted
+ * automatically; therefore classical "int" or "long long" etc is viable.
+ */
+
+#define MAX_FIELD_LEN (32 + 16)
+
+/* Please keep this at a size of 64 bytes by
+ * reuse of *spare* fields.
+ */
+struct xio_desc_cache {
+ u8 cache_sender_proto;
+ u8 cache_recver_proto;
+ s8 cache_is_bigendian;
+ u8 cache_spare0;
+ s16 cache_items;
+ u16 cache_spare1;
+ u32 cache_spare2;
+ u32 cache_spare3;
+ u64 cache_spare4[4];
+ u64 cache_sender_cookie;
+ u64 cache_recver_cookie;
+};
+
+/* Please keep this also at a size of 64 bytes by
+ * reuse of *spare* fields.
+ */
+struct xio_desc_item {
+ s8 field_type;
+ s8 field_spare0;
+ s16 field_data_size;
+ s16 field_sender_size;
+ s16 field_sender_offset;
+ s16 field_recver_size;
+ s16 field_recver_offset;
+ s32 field_spare;
+ char field_name[MAX_FIELD_LEN];
+};
+
+/* This must not be mirror symmetric between big and little endian
+ */
+#define XIO_DESC_MAGIC 0x73D0A2EC6148F48Ell
+
+struct xio_desc_header {
+ u64 h_magic;
+ u64 h_cookie;
+ s16 h_meta_len;
+ s16 h_index;
+ u32 h_spare1;
+ u64 h_spare2;
+};
+
+#define MAX_INT_TRANSFER 16
+
+/******************************************************************/
+
+/* Bytesex conversion / sign extension
+ */
+
+#ifdef __LITTLE_ENDIAN
+static const bool myself_is_bigendian;
+
+#endif
+#ifdef __BIG_ENDIAN
+static const bool myself_is_bigendian = true;
+
+#endif
+
+static inline
+void swap_bytes(void *data, int len)
+{
+ char *a = data;
+ char *b = data + len - 1;
+
+ while (a < b) {
+ char tmp = *a;
+
+ *a = *b;
+ *b = tmp;
+ a++;
+ b--;
+ }
+}
+
+#define SWAP_FIELD(x) swap_bytes(&(x), sizeof(x))
+
+static inline
+void swap_mc(struct xio_desc_cache *mc, int len)
+{
+ struct xio_desc_item *mi;
+
+ SWAP_FIELD(mc->cache_sender_cookie);
+ SWAP_FIELD(mc->cache_recver_cookie);
+ SWAP_FIELD(mc->cache_items);
+
+ len -= sizeof(*mc);
+
+ for (mi = (void *)(mc + 1); len > 0; mi++, len -= sizeof(*mi)) {
+ SWAP_FIELD(mi->field_data_size);
+ SWAP_FIELD(mi->field_sender_size);
+ SWAP_FIELD(mi->field_sender_offset);
+ SWAP_FIELD(mi->field_recver_size);
+ SWAP_FIELD(mi->field_recver_offset);
+ }
+}
+
+static inline
+char get_sign(const void *data, int len, bool is_bigendian, bool is_signed)
+{
+ if (is_signed) {
+ char x = is_bigendian ?
+ ((const char *)data)[0] :
+ ((const char *)data)[len - 1];
+ if (x < 0)
+ return -1;
+ }
+ return 0;
+}
+
+/******************************************************************/
+
+/* Low-level network traffic
+ */
+
+int xio_net_default_port = CONFIG_MARS_DEFAULT_PORT;
+
+module_param_named(xio_port, xio_net_default_port, int, 0);
+
+int xio_net_bind_before_listen = 1;
+
+module_param_named(xio_net_bind_before_listen, xio_net_bind_before_listen, int, 0);
+
+int xio_net_bind_before_connect = 1;
+
+/* TODO: make all the socket options configurable.
+ * TODO: implement signal handling.
+ * TODO: add authentication.
+ * TODO: add encryption.
+ */
+
+struct xio_tcp_params default_tcp_params = {
+ .ip_tos = IPTOS_LOWDELAY,
+ .tcp_window_size = 8 * 1024 * 1024, /* for long distance replications */
+ .tcp_nodelay = 0,
+ .tcp_timeout = 2,
+ .tcp_keepcnt = 3,
+ .tcp_keepintvl = 3, /* keepalive ping time */
+ .tcp_keepidle = 4,
+};
+
+static char *id;
+
+char *my_id(void)
+{
+ struct new_utsname *u;
+
+ if (!id) {
+ /* down_read(&uts_sem); // FIXME: this is currenty not EXPORTed from the kernel! */
+ u = utsname();
+ if (u)
+ id = brick_strdup(u->nodename);
+ /* up_read(&uts_sem); */
+ }
+ return id;
+}
+
+static
+void __setsockopt(struct socket *sock, int level, int optname, char *optval, int optsize)
+{
+ int status = kernel_setsockopt(sock, level, optname, optval, optsize);
+
+ if (status < 0) {
+ XIO_WRN("cannot set %d socket option %d to value %d, status = %d\n",
+ level, optname, *(int *)optval, status);
+ }
+}
+
+#define _setsockopt(sock, level, optname, val) __setsockopt(sock, level, optname, (char *)&(val), sizeof(val))
+
+int xio_create_sockaddr(struct sockaddr_storage *addr, const char *spec)
+{
+ struct sockaddr_in *sockaddr = (void *)addr;
+ const char *new_spec;
+ const char *tmp_spec;
+ int status = 0;
+
+ memset(addr, 0, sizeof(*addr));
+ sockaddr->sin_family = AF_INET;
+ sockaddr->sin_port = htons(xio_net_default_port);
+
+ /* Try to translate hostnames to IPs if possible.
+ */
+ if (xio_translate_hostname)
+ new_spec = xio_translate_hostname(spec);
+ else
+ new_spec = brick_strdup(spec);
+ tmp_spec = new_spec;
+
+ /* This is PROVISIONARY!
+ * TODO: add IPV6 syntax and many more features :)
+ */
+ if (!*tmp_spec)
+ goto done;
+ if (*tmp_spec != ':') {
+ unsigned char u0 = 0, u1 = 0, u2 = 0, u3 = 0;
+
+ status = sscanf(tmp_spec, "%hhu.%hhu.%hhu.%hhu", &u0, &u1, &u2, &u3);
+ if (status != 4) {
+ XIO_ERR("invalid sockaddr IP syntax '%s', status = %d\n", tmp_spec, status);
+ status = -EINVAL;
+ goto done;
+ }
+ XIO_DBG("decoded IP = %u.%u.%u.%u\n", u0, u1, u2, u3);
+ sockaddr->sin_addr.s_addr = (__be32)u0 | (__be32)u1 << 8 | (__be32)u2 << 16 | (__be32)u3 << 24;
+ }
+ /* deocde port number (when present) */
+ tmp_spec = spec;
+ while (*tmp_spec && *tmp_spec++ != ':')
+ /*empty*/;
+ if (*tmp_spec) {
+ int port = 0;
+
+ status = kstrtoint(tmp_spec, 10, &port);
+ if (unlikely(status)) {
+ XIO_ERR("invalid sockaddr PORT syntax '%s', status = %d\n", tmp_spec, status);
+ status = -EINVAL;
+ goto done;
+ }
+ XIO_DBG("decoded PORT = %d\n", port);
+ sockaddr->sin_port = htons(port);
+ }
+ status = 0;
+done:
+ brick_string_free(new_spec);
+ return status;
+}
+
+static int current_debug_nr; /* no locking, just for debugging */
+
+static
+void _set_socketopts(struct socket *sock)
+{
+ struct timeval t = {
+ .tv_sec = default_tcp_params.tcp_timeout,
+ };
+ int x_true = 1;
+
+ /* TODO: improve this by a table-driven approach
+ */
+ sock->sk->sk_rcvtimeo = sock->sk->sk_sndtimeo = default_tcp_params.tcp_timeout * HZ;
+ sock->sk->sk_reuse = 1;
+ _setsockopt(sock, SOL_SOCKET, SO_SNDBUFFORCE, default_tcp_params.tcp_window_size);
+ _setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, default_tcp_params.tcp_window_size);
+ _setsockopt(sock, SOL_IP, SO_PRIORITY, default_tcp_params.ip_tos);
+ _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, default_tcp_params.tcp_nodelay);
+ _setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, x_true);
+ _setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, default_tcp_params.tcp_keepcnt);
+ _setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, default_tcp_params.tcp_keepintvl);
+ _setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, default_tcp_params.tcp_keepidle);
+ _setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, t);
+ _setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, t);
+
+ if (sock->file) { /* switch back to blocking mode */
+ sock->file->f_flags &= ~O_NONBLOCK;
+ }
+}
+
+static int _xio_send_raw(struct xio_socket *msock, const void *buf, int len, int flags);
+static int _xio_recv_raw(struct xio_socket *msock, void *buf, int minlen, int maxlen, int flags);
+
+static
+void xio_proto_check(struct xio_socket *msock)
+{
+ u8 service_version = 0;
+ u16 service_flags = 0;
+ int status;
+
+ status = _xio_recv_raw(msock, &service_version, 1, 1, 0);
+ if (unlikely(status < 0)) {
+ XIO_DBG("#%d protocol exchange failed at receiving, status = %d\n",
+ msock->s_debug_nr,
+ status);
+ goto out_return;
+ }
+
+ /* take the the minimum of both protocol versions */
+ if (service_version > msock->s_send_proto)
+ service_version = msock->s_send_proto;
+ msock->s_send_proto = service_version;
+
+ status = _xio_recv_raw(msock, &service_flags, 2, 2, 0);
+ if (unlikely(status < 0)) {
+ XIO_DBG("#%d protocol exchange failed at receiving, status = %d\n",
+ msock->s_debug_nr,
+ status);
+ goto out_return;
+ }
+
+ msock->s_recv_flags = service_flags;
+out_return:;
+}
+
+static
+int xio_proto_exchange(struct xio_socket *msock, const char *msg)
+{
+ int status;
+
+ msock->s_send_proto = SEND_PROTO_VERSION;
+ status = xio_send_raw(msock, &msock->s_send_proto, 1, false);
+ if (unlikely(status < 0)) {
+ XIO_DBG("#%d protocol exchange on %s failed at sending, status = %d\n",
+ msock->s_debug_nr,
+ msg,
+ status);
+ goto done;
+ }
+
+ msock->s_send_flags = net_global_flags;
+ status = xio_send_raw(msock, &msock->s_send_flags, 2, false);
+ if (unlikely(status < 0)) {
+ XIO_DBG("#%d flags exchange on %s failed at sending, status = %d\n",
+ msock->s_debug_nr,
+ msg,
+ status);
+ goto done;
+ }
+
+done:
+ return status;
+}
+
+int xio_create_socket(struct xio_socket *msock, struct sockaddr_storage *src_addr, struct sockaddr_storage *dst_addr)
+{
+ struct socket *sock;
+ struct sockaddr *src_sockaddr = (void *)src_addr;
+ struct sockaddr *dst_sockaddr = (void *)dst_addr;
+ int status = -EEXIST;
+
+ if (unlikely(atomic_read(&msock->s_count))) {
+ XIO_ERR("#%d socket already in use\n", msock->s_debug_nr);
+ goto final;
+ }
+ if (unlikely(msock->s_socket)) {
+ XIO_ERR("#%d socket already open\n", msock->s_debug_nr);
+ goto final;
+ }
+ atomic_set(&msock->s_count, 1);
+
+#ifdef __HAS_STRUCT_NET
+ status = sock_create_kern(&init_net, AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
+#else
+ status = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
+#endif
+ if (unlikely(status < 0 || !msock->s_socket)) {
+ msock->s_socket = NULL;
+ XIO_WRN("cannot create socket, status = %d\n", status);
+ goto final;
+ }
+ msock->s_debug_nr = ++current_debug_nr;
+ sock = msock->s_socket;
+ CHECK_PTR(sock, done);
+ msock->s_alive = true;
+
+ _set_socketopts(sock);
+
+ if (!dst_sockaddr) { /* we are server */
+ struct sockaddr_in bind_addr;
+
+ if (unlikely(!src_sockaddr)) {
+ XIO_ERR("no srcaddr given for bind()\n");
+ status = -EINVAL;
+ goto done;
+ }
+
+ memcpy(&bind_addr, src_sockaddr, sizeof(bind_addr));
+ if (!xio_net_bind_before_listen)
+ memset(&bind_addr.sin_addr, 0, sizeof(bind_addr.sin_addr));
+
+ status = kernel_bind(sock, (struct sockaddr *)&bind_addr, sizeof(bind_addr));
+ if (unlikely(status < 0)) {
+ XIO_WRN("#%d bind failed, status = %d\n", msock->s_debug_nr, status);
+ goto done;
+ }
+ status = kernel_listen(sock, 16);
+ if (status < 0)
+ XIO_WRN("#%d listen failed, status = %d\n", msock->s_debug_nr, status);
+ } else {
+ /* When both src and dst are given, explicitly bind local address.
+ * Needed for multihomed hosts.
+ */
+ if (src_sockaddr && xio_net_bind_before_connect) {
+ struct sockaddr_in bind_addr;
+
+ memcpy(&bind_addr, src_sockaddr, sizeof(bind_addr));
+ bind_addr.sin_port = 0;
+
+ status = kernel_bind(sock, (struct sockaddr *)&bind_addr, sizeof(struct sockaddr));
+ if (unlikely(status < 0)) {
+ XIO_WRN("#%d bind before connect failed (ignored), status = %d\n",
+ msock->s_debug_nr, status);
+ }
+ }
+
+ status = kernel_connect(sock, dst_sockaddr, sizeof(*dst_sockaddr), 0);
+ /* Treat non-blocking connects as successful.
+ * Any potential errors will show up later during traffic.
+ */
+ if (status == -EINPROGRESS) {
+ XIO_DBG("#%d connect in progress\n", msock->s_debug_nr);
+ status = 0;
+ }
+ if (unlikely(status < 0)) {
+ XIO_DBG("#%d connect failed, status = %d\n", msock->s_debug_nr, status);
+ goto done;
+ }
+ status = xio_proto_exchange(msock, "connect");
+ }
+
+done:
+ if (status < 0)
+ xio_put_socket(msock);
+ else
+ XIO_DBG("successfully created socket #%d\n", msock->s_debug_nr);
+final:
+ return status;
+}
+
+int xio_accept_socket(struct xio_socket *new_msock, struct xio_socket *old_msock)
+{
+ int status = -ENOENT;
+ struct socket *new_socket = NULL;
+ bool ok;
+
+ ok = xio_get_socket(old_msock);
+ if (likely(ok)) {
+ struct socket *sock = old_msock->s_socket;
+
+ if (unlikely(!sock))
+ goto err;
+
+ status = kernel_accept(sock, &new_socket, O_NONBLOCK);
+ if (unlikely(status < 0))
+ goto err;
+ if (unlikely(!new_socket)) {
+ status = -EBADF;
+ goto err;
+ }
+
+ _set_socketopts(new_socket);
+
+ memset(new_msock, 0, sizeof(struct xio_socket));
+ new_msock->s_socket = new_socket;
+ atomic_set(&new_msock->s_count, 1);
+ new_msock->s_alive = true;
+ new_msock->s_debug_nr = ++current_debug_nr;
+ XIO_DBG("#%d successfully accepted socket #%d\n", old_msock->s_debug_nr, new_msock->s_debug_nr);
+
+ status = xio_proto_exchange(new_msock, "accept");
+err:
+ xio_put_socket(old_msock);
+ }
+ return status;
+}
+
+bool xio_get_socket(struct xio_socket *msock)
+{
+ if (unlikely(atomic_read(&msock->s_count) <= 0)) {
+ XIO_ERR("#%d bad nesting on msock = %p\n", msock->s_debug_nr, msock);
+ return false;
+ }
+
+ atomic_inc(&msock->s_count);
+
+ if (unlikely(!msock->s_socket || !msock->s_alive)) {
+ xio_put_socket(msock);
+ return false;
+ }
+ return true;
+}
+
+void xio_put_socket(struct xio_socket *msock)
+{
+ if (unlikely(atomic_read(&msock->s_count) <= 0)) {
+ XIO_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
+ } else if (atomic_dec_and_test(&msock->s_count)) {
+ struct socket *sock = msock->s_socket;
+ int i;
+
+ XIO_DBG("#%d closing socket %p\n", msock->s_debug_nr, sock);
+ if (likely(sock && cmpxchg(&msock->s_alive, true, false)))
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+ if (likely(sock && !msock->s_alive)) {
+ XIO_DBG("#%d releasing socket %p\n", msock->s_debug_nr, sock);
+ sock_release(sock);
+ }
+ for (i = 0; i < MAX_DESC_CACHE; i++) {
+ if (msock->s_desc_send[i])
+ brick_block_free(msock->s_desc_send[i], PAGE_SIZE);
+ if (msock->s_desc_recv[i])
+ brick_block_free(msock->s_desc_recv[i], PAGE_SIZE);
+ }
+ brick_block_free(msock->s_buffer, PAGE_SIZE);
+ memset(msock, 0, sizeof(struct xio_socket));
+ }
+}
+
+void xio_shutdown_socket(struct xio_socket *msock)
+{
+ if (msock->s_socket) {
+ bool ok = xio_get_socket(msock);
+
+ if (likely(ok)) {
+ struct socket *sock = msock->s_socket;
+
+ if (likely(sock && cmpxchg(&msock->s_alive, true, false))) {
+ XIO_DBG("#%d shutdown socket %p\n", msock->s_debug_nr, sock);
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+ }
+ xio_put_socket(msock);
+ }
+ }
+}
+
+bool xio_socket_is_alive(struct xio_socket *msock)
+{
+ bool res = false;
+
+ if (!msock->s_socket || !msock->s_alive)
+ goto done;
+ if (unlikely(atomic_read(&msock->s_count) <= 0)) {
+ XIO_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
+ goto done;
+ }
+ res = true;
+done:
+ return res;
+}
+
+long xio_socket_send_space_available(struct xio_socket *msock)
+{
+ struct socket *raw_sock = msock->s_socket;
+ long res = 0;
+
+ if (!msock->s_alive || !raw_sock || !raw_sock->sk)
+ goto done;
+ if (unlikely(atomic_read(&msock->s_count) <= 0)) {
+ XIO_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
+ goto done;
+ }
+
+ res = raw_sock->sk->sk_sndbuf - raw_sock->sk->sk_wmem_queued;
+ if (res < 0)
+ res = 0;
+ res += msock->s_pos;
+
+done:
+ return res;
+}
+
+static
+int _xio_send_raw(struct xio_socket *msock, const void *buf, int len, int flags)
+{
+ int sleeptime = 1000 / HZ;
+ int sent = 0;
+ int status = 0;
+
+ msock->s_send_cnt = 0;
+ while (len > 0) {
+ int this_len = len;
+ struct socket *sock = msock->s_socket;
+
+ if (unlikely(!sock || !xio_net_is_alive || brick_thread_should_stop())) {
+ XIO_WRN("interrupting, sent = %d\n", sent);
+ status = -EIDRM;
+ break;
+ }
+
+ {
+ struct kvec iov = {
+ .iov_base = (void *)buf,
+ .iov_len = this_len,
+ };
+ struct msghdr msg = {
+#ifndef __HAS_IOV_ITER
+ .msg_iov = (struct iovec *)&iov,
+#endif
+ .msg_flags = 0 | MSG_NOSIGNAL,
+ };
+ status = kernel_sendmsg(sock, &msg, &iov, 1, this_len);
+ }
+
+ if (status == -EAGAIN) {
+ if (msock->s_send_abort > 0 && ++msock->s_send_cnt > msock->s_send_abort) {
+ XIO_WRN("#%d reached send abort %d\n", msock->s_debug_nr, msock->s_send_abort);
+ status = -EINTR;
+ break;
+ }
+ brick_msleep(sleeptime);
+ /* linearly increasing backoff */
+ if (sleeptime < 100)
+ sleeptime += 1000 / HZ;
+ continue;
+ }
+ msock->s_send_cnt = 0;
+ if (unlikely(status == -EINTR)) { /* ignore it */
+ flush_signals(current);
+ brick_msleep(50);
+ continue;
+ }
+ if (unlikely(!status)) {
+ XIO_WRN("#%d EOF from socket upon send_page()\n", msock->s_debug_nr);
+ brick_msleep(50);
+ status = -ECOMM;
+ break;
+ }
+ if (unlikely(status < 0)) {
+ XIO_WRN("#%d bad socket sendmsg, len=%d, this_len=%d, sent=%d, status = %d\n",
+ msock->s_debug_nr,
+ len,
+ this_len,
+ sent,
+ status);
+ break;
+ }
+
+ len -= status;
+ buf += status;
+ sent += status;
+ sleeptime = 1000 / HZ;
+ }
+
+ msock->s_send_bytes += sent;
+ if (status >= 0)
+ status = sent;
+
+ return status;
+}
+
+int xio_send_raw(struct xio_socket *msock, const void *buf, int len, bool cork)
+{
+#ifdef USE_BUFFERING
+ int sent = 0;
+ int rest = len;
+
+#endif
+ int status = -EINVAL;
+
+ if (!xio_get_socket(msock))
+ goto final;
+
+#ifdef USE_BUFFERING
+restart:
+ if (!msock->s_buffer) {
+ msock->s_pos = 0;
+ msock->s_buffer = brick_block_alloc(0, PAGE_SIZE);
+ }
+
+ if (msock->s_pos + rest < PAGE_SIZE) {
+ memcpy(msock->s_buffer + msock->s_pos, buf, rest);
+ msock->s_pos += rest;
+ sent += rest;
+ rest = 0;
+ status = sent;
+ if (cork)
+ goto done;
+ }
+
+ if (msock->s_pos > 0) {
+ status = _xio_send_raw(msock, msock->s_buffer, msock->s_pos, 0);
+ if (status < 0)
+ goto done;
+
+ brick_block_free(msock->s_buffer, PAGE_SIZE);
+ msock->s_buffer = NULL;
+ msock->s_pos = 0;
+ }
+
+ if (rest >= PAGE_SIZE) {
+ status = _xio_send_raw(msock, buf, rest, 0);
+ goto done;
+ } else if (rest > 0) {
+ goto restart;
+ }
+ status = sent;
+
+done:
+#else
+ status = _xio_send_raw(msock, buf, len, 0);
+#endif
+ if (status < 0 && msock->s_shutdown_on_err)
+ xio_shutdown_socket(msock);
+
+ xio_put_socket(msock);
+
+final:
+ return status;
+}
+
+/**
+ * xio_recv_raw() - Get [min, max] number of bytes
+ * @msock: socket to read from
+ * @buf: buffer to put the data in
+ * @minlen: minimum number of bytes to read
+ * @maxlen: maximum number of bytes to read
+ *
+ * Returns a negative error code or a number between [@minlen, @maxlen].
+ * Short reads are mapped to an error.
+ *
+ * Hint: by setting @minlen to 1, you can read any number up to @maxlen.
+ * However, the most important use case is @minlen == @maxlen.
+ *
+ * Note: buf may be NULL. In this case, the data is simply consumed,
+ * like /dev/null
+ */
+static
+int _xio_recv_raw(struct xio_socket *msock, void *buf, int minlen, int maxlen, int flags)
+{
+ void *dummy = NULL;
+ int sleeptime = 1000 / HZ;
+ int status = -EIDRM;
+ int done = 0;
+
+ if (!buf)
+ buf = dummy = brick_block_alloc(0, maxlen);
+
+ if (!xio_get_socket(msock))
+ goto final;
+
+ if (minlen < maxlen) {
+ struct socket *sock = msock->s_socket;
+
+ if (sock && sock->file) {
+ /* Use nonblocking reads to consume as much data
+ * as possible
+ */
+ sock->file->f_flags |= O_NONBLOCK;
+ }
+ }
+
+ msock->s_recv_cnt = 0;
+ while (done < minlen || (!minlen && !done)) {
+ struct kvec iov = {
+ .iov_base = buf + done,
+ .iov_len = maxlen - done,
+ };
+ struct msghdr msg = {
+#ifndef __HAS_IOV_ITER
+ .msg_iovlen = 1,
+ .msg_iov = (struct iovec *)&iov,
+#endif
+ .msg_flags = flags | MSG_NOSIGNAL,
+ };
+ struct socket *sock = msock->s_socket;
+
+ if (unlikely(!sock)) {
+ XIO_WRN("#%d socket has disappeared\n", msock->s_debug_nr);
+ status = -EIDRM;
+ goto err;
+ }
+
+ if (!xio_net_is_alive || brick_thread_should_stop()) {
+ XIO_WRN("#%d interrupting, done = %d\n", msock->s_debug_nr, done);
+ status = -EIDRM;
+ goto err;
+ }
+
+ status = kernel_recvmsg(sock, &msg, &iov, 1, maxlen-done, msg.msg_flags);
+
+ if (!xio_net_is_alive || brick_thread_should_stop()) {
+ XIO_WRN("#%d interrupting, done = %d\n", msock->s_debug_nr, done);
+ status = -EIDRM;
+ goto err;
+ }
+
+ if (status == -EAGAIN) {
+ if (msock->s_recv_abort > 0 && ++msock->s_recv_cnt > msock->s_recv_abort) {
+ XIO_WRN("#%d reached recv abort %d\n", msock->s_debug_nr, msock->s_recv_abort);
+ status = -EINTR;
+ goto err;
+ }
+ brick_msleep(sleeptime);
+ if (minlen <= 0)
+ break;
+ /* linearly increasing backoff */
+ if (sleeptime < 100)
+ sleeptime += 1000 / HZ;
+ continue;
+ }
+ msock->s_recv_cnt = 0;
+ if (!status) { /* EOF */
+ XIO_WRN("#%d got EOF from socket (done=%d, req_size=%d)\n",
+ msock->s_debug_nr,
+ done,
+ maxlen - done);
+ status = -EPIPE;
+ goto err;
+ }
+ if (status < 0) {
+ XIO_WRN("#%d bad recvmsg, status = %d\n", msock->s_debug_nr, status);
+ goto err;
+ }
+ done += status;
+ sleeptime = 1000 / HZ;
+ }
+ status = done;
+ msock->s_recv_bytes += done;
+
+err:
+ if (status < 0 && msock->s_shutdown_on_err)
+ xio_shutdown_socket(msock);
+ xio_put_socket(msock);
+final:
+ if (dummy)
+ brick_block_free(dummy, maxlen);
+ return status;
+}
+
+int xio_recv_raw(struct xio_socket *msock, void *buf, int minlen, int maxlen)
+{
+ /* Check the very first received byte for higher-level protocol
+ * information. This safes one ping-pong cycle at
+ * xio_proto_exchange() because the sender can immediately
+ * start sending bulk data without need to wait there.
+ * This is important for latency, thus we exceptionally break
+ * the layering hierarchy here. Also, we start sending at
+ * the lowest possible protocol version and may increase
+ * the protocol capabilities dynamically at runtime,
+ * somewhen later. This bears some slight nondeterminism,
+ * but we take it into account for performance reasons.
+ */
+ if (unlikely(!msock->s_recv_bytes))
+ xio_proto_check(msock);
+
+ return _xio_recv_raw(msock, buf, minlen, maxlen, 0);
+}
+
+int xio_send_compressed(struct xio_socket *msock, const void *buf, s32 len, int compress, bool cork)
+{
+ void *compr_data = NULL;
+
+ s16 compr_code = 0;
+ int status;
+
+ switch (compress) {
+ case COMPRESS_LZO:
+#ifdef __HAVE_LZO
+ /* tolerate mixes of different proto versions */
+ if (msock->s_send_proto >= 2 && (msock->s_recv_flags & COMPRESS_LZO)) {
+ size_t compr_len = 0;
+ int lzo_status;
+ void *wrkmem;
+
+ compr_data = brick_mem_alloc(lzo1x_worst_compress(len));
+ wrkmem = brick_mem_alloc(LZO1X_1_MEM_COMPRESS);
+
+ lzo_status = lzo1x_1_compress(buf, len, compr_data, &compr_len, wrkmem);
+
+ brick_mem_free(wrkmem);
+ if (likely(lzo_status == LZO_E_OK && compr_len < len)) {
+ compr_code = COMPRESS_LZO;
+ buf = compr_data;
+ len = compr_len;
+ }
+ }
+#endif
+ break;
+
+ /* implement further methods here */
+
+ default:
+ /* ignore unknown compress codes */
+ break;
+ }
+
+ /* allow mixing of different proto versions */
+ if (likely(msock->s_send_proto >= 2)) {
+ status = xio_send_raw(msock, &compr_code, sizeof(compr_code), true);
+ if (unlikely(status < 0))
+ goto done;
+ if (compr_code > 0) {
+ status = xio_send_raw(msock, &len, sizeof(len), true);
+ if (unlikely(status < 0))
+ goto done;
+ }
+ }
+
+ status = xio_send_raw(msock, buf, len, cork);
+
+done:
+ brick_mem_free(compr_data);
+ return status;
+}
+
+int xio_recv_compressed(struct xio_socket *msock, void *buf, int minlen, int maxlen)
+{
+ void *compr_data = NULL;
+
+ s16 compr_code = COMPRESS_NONE;
+ int status;
+
+ /* allow mixing of different proto versions */
+ if (msock->s_send_proto >= 2) {
+ status = xio_recv_raw(msock, &compr_code, sizeof(compr_code), sizeof(compr_code));
+ if (unlikely(status < 0))
+ goto done;
+ }
+
+ switch (compr_code) {
+ case COMPRESS_NONE:
+ status = xio_recv_raw(msock, buf, minlen, maxlen);
+ break;
+
+ case COMPRESS_LZO:
+#ifdef __HAVE_LZO
+ {
+ s32 compr_len = 0;
+ size_t this_len;
+ int lzo_status;
+
+ status = xio_recv_raw(msock, &compr_len, sizeof(compr_len), sizeof(compr_len));
+ if (unlikely(status < 0))
+ goto done;
+ if (unlikely(compr_len <= 0 || compr_len >= maxlen)) {
+ XIO_ERR("bad comp_len = %d, real minlen = %d maxlen = %d\n",
+ compr_len, minlen, maxlen);
+ status = -EOVERFLOW;
+ goto done;
+ }
+
+ compr_data = brick_mem_alloc(compr_len);
+
+ status = xio_recv_raw(msock, compr_data, compr_len, compr_len);
+ if (unlikely(status < 0))
+ goto done;
+
+ this_len = maxlen;
+ lzo_status = lzo1x_decompress_safe(compr_data, compr_len, buf, &this_len);
+
+ status = this_len;
+ if (unlikely(lzo_status != LZO_E_OK)) {
+ XIO_ERR("bad decompression, lzo_status = %d\n", lzo_status);
+ status = -EBADE;
+ goto done;
+ }
+ if (unlikely(this_len < minlen || this_len > maxlen)) {
+ XIO_WRN("bad decompression length this_len = %ld, minlen = %d maxlen = %d\n",
+ (long)this_len,
+ minlen,
+ maxlen);
+ status = -EBADMSG;
+ goto done;
+ }
+ break;
+ }
+#else
+ XIO_WRN("cannot LZO decompress\n");
+ status = -EBADMSG;
+ break;
+#endif
+
+ /* implement further methods here */
+
+ default:
+ XIO_WRN("got unknown compr_code = %d\n", compr_code);
+ status = -EBADRQC;
+ }
+
+done:
+ brick_mem_free(compr_data);
+ return status;
+}
+
+/*********************************************************************/
+
+/* Mid-level field data exchange
+ */
+
+static
+void dump_meta(const struct meta *meta)
+{
+ int count = 0;
+
+ for (; meta->field_name != NULL; meta++) {
+ XIO_ERR("%2d %4d %4d %4d %p '%s'\n",
+ meta->field_type,
+ meta->field_data_size,
+ meta->field_transfer_size,
+ meta->field_offset,
+ meta->field_ref,
+ meta->field_name);
+ count++;
+ }
+ XIO_ERR("-------- %d fields.\n", count);
+}
+
+static
+int _add_fields(struct xio_desc_item *mi, const struct meta *meta, int offset, const char *prefix, int maxlen)
+{
+ int count = 0;
+
+ for (; meta->field_name != NULL; meta++) {
+ const char *new_prefix;
+ int new_offset;
+ int len;
+
+ short this_size;
+
+ new_prefix = mi->field_name;
+ new_offset = offset + meta->field_offset;
+
+ if (unlikely(maxlen < sizeof(struct xio_desc_item))) {
+ XIO_ERR("desc cache item overflow\n");
+ count = -1;
+ goto done;
+ }
+
+ len = scnprintf(mi->field_name, MAX_FIELD_LEN, "%s.%s", prefix, meta->field_name);
+ if (unlikely(len >= MAX_FIELD_LEN)) {
+ XIO_ERR("field len overflow on '%s.%s'\n", prefix, meta->field_name);
+ count = -1;
+ goto done;
+ }
+ mi->field_type = meta->field_type;
+ this_size = meta->field_data_size;
+ mi->field_data_size = this_size;
+ mi->field_sender_size = this_size;
+ this_size = meta->field_transfer_size;
+ if (this_size > 0)
+ mi->field_sender_size = this_size;
+ mi->field_sender_offset = new_offset;
+ mi->field_recver_offset = -1;
+
+ mi++;
+ maxlen -= sizeof(struct xio_desc_item);
+ count++;
+
+ if (meta->field_type == FIELD_SUB) {
+ int sub_count;
+
+ sub_count = _add_fields(mi, meta->field_ref, new_offset, new_prefix, maxlen);
+ if (sub_count < 0)
+ return sub_count;
+
+ mi += sub_count;
+ count += sub_count;
+ maxlen -= sub_count * sizeof(struct xio_desc_item);
+ }
+ }
+done:
+ return count;
+}
+
+static
+struct xio_desc_cache *make_sender_cache(struct xio_socket *msock, const struct meta *meta, int *cache_index)
+{
+ int orig_len = PAGE_SIZE;
+ int maxlen = orig_len;
+ struct xio_desc_cache *mc;
+ struct xio_desc_item *mi;
+ int i;
+ int status;
+
+ for (i = 0; i < MAX_DESC_CACHE; i++) {
+ mc = msock->s_desc_send[i];
+ if (!mc)
+ break;
+ if (mc->cache_sender_cookie == (u64)meta)
+ goto done;
+ }
+
+ if (unlikely(i >= MAX_DESC_CACHE - 1)) {
+ XIO_ERR("#%d desc cache overflow\n", msock->s_debug_nr);
+ return NULL;
+ }
+
+ mc = brick_block_alloc(0, maxlen);
+
+ memset(mc, 0, maxlen);
+ mc->cache_sender_cookie = (u64)meta;
+ /* further bits may be used in future */
+ mc->cache_sender_proto = msock->s_send_proto;
+ mc->cache_recver_proto = msock->s_recv_proto;
+
+ maxlen -= sizeof(struct xio_desc_cache);
+ mi = (void *)(mc + 1);
+
+ status = _add_fields(mi, meta, 0, "", maxlen);
+
+ if (likely(status > 0)) {
+ mc->cache_items = status;
+ mc->cache_is_bigendian = myself_is_bigendian;
+ msock->s_desc_send[i] = mc;
+ *cache_index = i;
+ } else {
+ brick_block_free(mc, orig_len);
+ mc = NULL;
+ }
+
+done:
+ return mc;
+}
+
+static
+int _make_recver_cache(struct xio_desc_cache *mc, const struct meta *meta, int offset, const char *prefix)
+{
+ char *tmp = brick_string_alloc(MAX_FIELD_LEN);
+ int count = 0;
+ int i;
+
+ for (; meta->field_name != NULL; meta++, count++) {
+ snprintf(tmp, MAX_FIELD_LEN, "%s.%s", prefix, meta->field_name);
+ for (i = 0; i < mc->cache_items; i++) {
+ struct xio_desc_item *mi = ((struct xio_desc_item *)(mc + 1)) + i;
+
+ if (meta->field_type == mi->field_type &&
+ !strcmp(tmp, mi->field_name)) {
+ mi->field_recver_size = meta->field_data_size;
+ mi->field_recver_offset = offset + meta->field_offset;
+ if (meta->field_type == FIELD_SUB) {
+ int sub_count = _make_recver_cache(mc,
+
+ meta->field_ref,
+ mi->field_recver_offset,
+ tmp);
+ if (unlikely(sub_count <= 0)) {
+ count = 0;
+ goto done;
+ }
+ }
+ goto found;
+ }
+ }
+ if (unlikely(!count)) {
+ XIO_ERR("field '%s' is missing\n", meta->field_name);
+ goto done;
+ }
+ XIO_WRN("field %2d '%s' is missing\n", count, meta->field_name);
+found:;
+ }
+done:
+ brick_string_free(tmp);
+ return count;
+}
+
+static
+int make_recver_cache(struct xio_desc_cache *mc, const struct meta *meta)
+{
+ int count;
+ int i;
+
+ mc->cache_recver_cookie = (u64)meta;
+ count = _make_recver_cache(mc, meta, 0, "");
+
+ for (i = 0; i < mc->cache_items; i++) {
+ struct xio_desc_item *mi = ((struct xio_desc_item *)(mc + 1)) + i;
+
+ if (unlikely(mi->field_recver_offset < 0))
+ XIO_WRN("field '%s' is not transferred\n", mi->field_name);
+ }
+ return count;
+}
+
+#define _CHECK_STATUS(_txt_) \
+do { \
+ if (unlikely(status < 0)) { \
+ XIO_DBG("%s status = %d\n", _txt_, status); \
+ goto err; \
+ } \
+} while (0)
+
+static
+int _desc_send_item(struct xio_socket *msock,
+ const void *data,
+ const struct xio_desc_cache *mc,
+ int index,
+ bool cork)
+{
+ struct xio_desc_item *mi = ((struct xio_desc_item *)(mc + 1)) + index;
+ const void *item = data + mi->field_sender_offset;
+
+ s16 data_len = mi->field_data_size;
+ s16 transfer_len = mi->field_sender_size;
+ int status;
+ bool is_signed = false;
+ int res = -1;
+
+ switch (mi->field_type) {
+ case FIELD_REF:
+ XIO_ERR("field '%s' NYI type = %d\n", mi->field_name, mi->field_type);
+ goto err;
+ case FIELD_SUB:
+ /* skip this */
+ res = 0;
+ break;
+ case FIELD_INT:
+ is_signed = true;
+ /* fallthrough */
+ case FIELD_UINT:
+ if (unlikely(data_len <= 0 || data_len > MAX_INT_TRANSFER)) {
+ XIO_ERR("field '%s' bad data_len = %d\n", mi->field_name, data_len);
+ goto err;
+ }
+ if (unlikely(transfer_len > MAX_INT_TRANSFER)) {
+ XIO_ERR("field '%s' bad transfer_len = %d\n", mi->field_name, transfer_len);
+ goto err;
+ }
+
+ if (likely(data_len == transfer_len))
+ goto raw;
+
+ if (transfer_len > data_len) {
+ int diff = transfer_len - data_len;
+ char empty[diff];
+ char sign;
+
+ sign = get_sign(item, data_len, myself_is_bigendian, is_signed);
+ memset(empty, sign, diff);
+
+ if (myself_is_bigendian) {
+ status = xio_send_raw(msock, empty, diff, true);
+ _CHECK_STATUS("send_diff");
+ status = xio_send_raw(msock, item, data_len, cork);
+ _CHECK_STATUS("send_item");
+
+ } else {
+ status = xio_send_raw(msock, item, data_len, true);
+ _CHECK_STATUS("send_item");
+ status = xio_send_raw(msock, empty, diff, cork);
+ _CHECK_STATUS("send_diff");
+ }
+
+ res = data_len;
+ break;
+ } else if (unlikely(transfer_len <= 0)) {
+ XIO_ERR("bad transfer_len = %d\n", transfer_len);
+ goto err;
+ } else { /* transfer_len < data_len */
+ char check = get_sign(item, data_len, myself_is_bigendian, is_signed);
+ int start;
+ int end;
+ int i;
+
+ if (is_signed &&
+ unlikely(get_sign(item, transfer_len, myself_is_bigendian, true) != check)) {
+ XIO_ERR("cannot sign-reduce signed integer from %d to %d bytes, byte %d !~ %d\n",
+ data_len,
+ transfer_len,
+ ((char *)item)[transfer_len - 1],
+ check);
+ goto err;
+ }
+
+ if (myself_is_bigendian) {
+ start = 0;
+ end = data_len - transfer_len;
+ } else {
+ start = transfer_len;
+ end = data_len;
+ }
+
+ for (i = start; i < end; i++) {
+ if (unlikely(((char *)item)[i] != check)) {
+ XIO_ERR("cannot sign-reduce %ssigned integer from %d to %d bytes at pos %d, byte %d != %d\n",
+ is_signed ? "" : "un",
+ data_len,
+ transfer_len,
+ i,
+ ((char *)item)[i],
+ check);
+ goto err;
+ }
+ }
+
+ /* just omit the higher/lower bytes */
+ data_len = transfer_len;
+ if (myself_is_bigendian)
+ item += end;
+ goto raw;
+ }
+ case FIELD_STRING:
+ item = *(void **)item;
+ data_len = 0;
+ if (item)
+ data_len = strlen(item) + 1;
+
+ status = xio_send_raw(msock, &data_len, sizeof(data_len), true);
+ _CHECK_STATUS("send_string_len");
+ /* fallthrough */
+ case FIELD_RAW:
+raw:
+ if (unlikely(data_len < 0)) {
+ XIO_ERR("field '%s' bad data_len = %d\n", mi->field_name, data_len);
+ goto err;
+ }
+ status = xio_send_raw(msock, item, data_len, cork);
+ _CHECK_STATUS("send_raw");
+ res = data_len;
+ break;
+ default:
+ XIO_ERR("field '%s' unknown type = %d\n", mi->field_name, mi->field_type);
+ }
+err:
+ return res;
+}
+
+static
+int _desc_recv_item(struct xio_socket *msock, void *data, const struct xio_desc_cache *mc, int index, int line)
+{
+ struct xio_desc_item *mi = ((struct xio_desc_item *)(mc + 1)) + index;
+ void *item = NULL;
+
+ s16 data_len = mi->field_recver_size;
+ s16 transfer_len = mi->field_sender_size;
+ int status;
+ bool is_signed = false;
+ int res = -1;
+
+ if (likely(data && data_len > 0 && mi->field_recver_offset >= 0))
+ item = data + mi->field_recver_offset;
+
+ switch (mi->field_type) {
+ case FIELD_REF:
+ XIO_ERR("field '%s' NYI type = %d\n", mi->field_name, mi->field_type);
+ goto err;
+ case FIELD_SUB:
+ /* skip this */
+ res = 0;
+ break;
+ case FIELD_INT:
+ is_signed = true;
+ /* fallthrough */
+ case FIELD_UINT:
+ if (unlikely(data_len <= 0 || data_len > MAX_INT_TRANSFER)) {
+ XIO_ERR("field '%s' bad data_len = %d\n", mi->field_name, data_len);
+ goto err;
+ }
+ if (unlikely(transfer_len > MAX_INT_TRANSFER)) {
+ XIO_ERR("field '%s' bad transfer_len = %d\n", mi->field_name, transfer_len);
+ goto err;
+ }
+
+ if (likely(data_len == transfer_len))
+ goto raw;
+
+ if (transfer_len > data_len) {
+ int diff = transfer_len - data_len;
+ char empty[diff];
+ char check;
+
+ memset(empty, 0, diff);
+
+ if (myself_is_bigendian) {
+ status = xio_recv_raw(msock, empty, diff, diff);
+ _CHECK_STATUS("recv_diff");
+ }
+
+ status = xio_recv_raw(msock, item, data_len, data_len);
+ _CHECK_STATUS("recv_item");
+ if (unlikely(mc->cache_is_bigendian != myself_is_bigendian && item))
+ swap_bytes(item, data_len);
+
+ if (!myself_is_bigendian) {
+ status = xio_recv_raw(msock, empty, diff, diff);
+ _CHECK_STATUS("recv_diff");
+ }
+
+ /* check that sign extension did no harm */
+ check = get_sign(empty, diff, mc->cache_is_bigendian, is_signed);
+ while (--diff >= 0) {
+ if (unlikely(empty[diff] != check)) {
+ XIO_ERR("field '%s' %sSIGNED INTEGER OVERFLOW on size reduction from %d to %d, byte %d != %d\n",
+ mi->field_name,
+ is_signed ? "" : "UN",
+ transfer_len,
+ data_len,
+ empty[diff],
+ check);
+ goto err;
+ }
+ }
+ if (is_signed && item &&
+ unlikely(get_sign(item, data_len, myself_is_bigendian, true) != check)) {
+ XIO_ERR("field '%s' SIGNED INTEGER OVERLOW on reduction from size %d to %d, byte %d !~ %d\n",
+ mi->field_name,
+ transfer_len,
+ data_len,
+ ((char *)item)[data_len - 1],
+ check);
+ goto err;
+ }
+
+ res = data_len;
+ break;
+ } else if (unlikely(transfer_len <= 0)) {
+ XIO_ERR("field '%s' bad transfer_len = %d\n", mi->field_name, transfer_len);
+ goto err;
+ } else if (unlikely(!item)) { /* shortcut without checks */
+ data_len = transfer_len;
+ goto raw;
+ } else { /* transfer_len < data_len */
+ int diff = data_len - transfer_len;
+ char *transfer_ptr = item;
+ char sign;
+
+ if (myself_is_bigendian)
+ transfer_ptr += diff;
+
+ status = xio_recv_raw(msock, transfer_ptr, transfer_len, transfer_len);
+ _CHECK_STATUS("recv_transfer");
+ if (unlikely(mc->cache_is_bigendian != myself_is_bigendian))
+ swap_bytes(transfer_ptr, transfer_len);
+
+ /* sign-extend from transfer_len to data_len */
+ sign = get_sign(transfer_ptr, transfer_len, myself_is_bigendian, is_signed);
+ if (myself_is_bigendian)
+ memset(item, sign, diff);
+ else
+ memset(item + transfer_len, sign, diff);
+ res = data_len;
+ break;
+ }
+ case FIELD_STRING:
+ data_len = 0;
+ status = xio_recv_raw(msock, &data_len, sizeof(data_len), sizeof(data_len));
+ _CHECK_STATUS("recv_string_len");
+
+ if (unlikely(mc->cache_is_bigendian != myself_is_bigendian))
+ swap_bytes(&data_len, sizeof(data_len));
+
+ if (data_len > 0 && item) {
+ char *str = _brick_string_alloc(data_len, line);
+
+ *(void **)item = str;
+ item = str;
+ }
+
+ transfer_len = data_len;
+ /* fallthrough */
+ case FIELD_RAW:
+raw:
+ if (unlikely(data_len < 0)) {
+ XIO_ERR("field = '%s' implausible data_len = %d\n", mi->field_name, data_len);
+ goto err;
+ }
+ if (likely(data_len > 0)) {
+ if (unlikely(transfer_len != data_len)) {
+ XIO_ERR("cannot handle generic mismatch in transfer sizes, field = '%s', %d != %d\n",
+ mi->field_name,
+ transfer_len,
+ data_len);
+ goto err;
+ }
+ status = xio_recv_raw(msock, item, data_len, data_len);
+ _CHECK_STATUS("recv_raw");
+ }
+ res = data_len;
+ break;
+ default:
+ XIO_ERR("field '%s' unknown type = %d\n", mi->field_name, mi->field_type);
+ }
+err:
+ return res;
+}
+
+static inline
+int _desc_send_struct(struct xio_socket *msock, int cache_index, const void *data, int h_meta_len, bool cork)
+{
+ const struct xio_desc_cache *mc = msock->s_desc_send[cache_index];
+
+ struct xio_desc_header header = {
+ .h_magic = XIO_DESC_MAGIC,
+ .h_cookie = mc->cache_sender_cookie,
+ .h_meta_len = h_meta_len,
+ .h_index = data ? cache_index : -1,
+ };
+ int index;
+ int count = 0;
+ int status = 0;
+
+ status = xio_send_raw(msock, &header, sizeof(header), cork || data);
+ _CHECK_STATUS("send_header");
+
+ if (unlikely(h_meta_len > 0)) {
+ status = xio_send_raw(msock, mc, h_meta_len, true);
+ _CHECK_STATUS("send_meta");
+ }
+
+ if (likely(data)) {
+ for (index = 0; index < mc->cache_items; index++) {
+ status = _desc_send_item(msock, data, mc, index, cork || index < mc->cache_items-1);
+ _CHECK_STATUS("send_cache_item");
+ count++;
+ }
+ }
+
+ if (status >= 0)
+ status = count;
+err:
+ return status;
+}
+
+static
+int desc_send_struct(struct xio_socket *msock, const void *data, const struct meta *meta, bool cork)
+{
+ struct xio_desc_cache *mc;
+ int i;
+ int h_meta_len = 0;
+ int status = -EINVAL;
+
+ for (i = 0; i < MAX_DESC_CACHE; i++) {
+ mc = msock->s_desc_send[i];
+ if (!mc)
+ break;
+ if (mc->cache_sender_cookie == (u64)meta)
+ goto found;
+ }
+
+ mc = make_sender_cache(msock, meta, &i);
+ if (unlikely(!mc))
+ goto done;
+
+ h_meta_len = mc->cache_items * sizeof(struct xio_desc_item) + sizeof(struct xio_desc_cache);
+
+found:
+ status = _desc_send_struct(msock, i, data, h_meta_len, cork);
+
+done:
+ return status;
+}
+
+static
+int desc_recv_struct(struct xio_socket *msock, void *data, const struct meta *meta, int line)
+{
+ struct xio_desc_header header = {};
+ struct xio_desc_cache *mc;
+ int cache_index;
+ int index;
+ int count = 0;
+ int status = 0;
+ bool need_swap = false;
+
+ status = xio_recv_raw(msock, &header, sizeof(header), sizeof(header));
+ _CHECK_STATUS("recv_header");
+
+ if (unlikely(header.h_magic != XIO_DESC_MAGIC)) {
+ need_swap = true;
+ SWAP_FIELD(header.h_magic);
+ if (unlikely(header.h_magic != XIO_DESC_MAGIC)) {
+ XIO_WRN("#%d called from line %d bad packet header magic = %llx\n",
+ msock->s_debug_nr,
+ line,
+ header.h_magic);
+ status = -ENOMSG;
+ goto err;
+ }
+ SWAP_FIELD(header.h_cookie);
+ SWAP_FIELD(header.h_meta_len);
+ SWAP_FIELD(header.h_index);
+ }
+
+ cache_index = header.h_index;
+ if (cache_index < 0) { /* EOR */
+ goto done;
+ }
+ if (unlikely(cache_index >= MAX_DESC_CACHE - 1)) {
+ XIO_WRN("#%d called from line %d bad cache index %d\n", msock->s_debug_nr, line, cache_index);
+ status = -EBADF;
+ goto err;
+ }
+
+ mc = msock->s_desc_recv[cache_index];
+ if (unlikely(!mc)) {
+ if (unlikely(header.h_meta_len <= 0)) {
+ XIO_WRN("#%d called from line %d missing meta information\n", msock->s_debug_nr, line);
+ status = -ENOMSG;
+ goto err;
+ }
+
+ mc = _brick_block_alloc(0, PAGE_SIZE, line);
+
+ status = xio_recv_raw(msock, mc, header.h_meta_len, header.h_meta_len);
+ if (unlikely(status < 0))
+ brick_block_free(mc, PAGE_SIZE);
+ _CHECK_STATUS("recv_meta");
+
+ if (unlikely(need_swap))
+ swap_mc(mc, header.h_meta_len);
+
+ status = make_recver_cache(mc, meta);
+ if (unlikely(status < 0)) {
+ brick_block_free(mc, PAGE_SIZE);
+ goto err;
+ }
+ msock->s_desc_recv[cache_index] = mc;
+ } else if (unlikely(header.h_meta_len > 0)) {
+ XIO_WRN("#%d called from line %d has %d unexpected meta bytes\n",
+ msock->s_debug_nr,
+ line,
+ header.h_meta_len);
+ status = -EMSGSIZE;
+ goto err;
+ } else if (unlikely(mc->cache_recver_cookie != (u64)meta)) {
+ XIO_ERR("#%d protocol error %p != %p\n", msock->s_debug_nr, meta, (void *)mc->cache_recver_cookie);
+ dump_meta((void *)mc->cache_recver_cookie);
+ dump_meta(meta);
+ status = -EPROTO;
+ goto err;
+ }
+
+ for (index = 0; index < mc->cache_items; index++) {
+ status = _desc_recv_item(msock, data, mc, index, line);
+ _CHECK_STATUS("recv_cache_item");
+ count++;
+ }
+
+done:
+ if (status >= 0)
+ status = count;
+err:
+ return status;
+}
+
+int xio_send_struct(struct xio_socket *msock, const void *data, const struct meta *meta)
+{
+ return desc_send_struct(msock, data, meta, false);
+}
+
+int _xio_recv_struct(struct xio_socket *msock, void *data, const struct meta *meta, int line)
+{
+ return desc_recv_struct(msock, data, meta, line);
+}
+
+/*********************************************************************/
+
+/* High-level transport of xio structures
+ */
+
+const struct meta xio_cmd_meta[] = {
+ META_INI_SUB(cmd_stamp, struct xio_cmd, xio_timespec_meta),
+ META_INI(cmd_code, struct xio_cmd, FIELD_INT),
+ META_INI(cmd_int1, struct xio_cmd, FIELD_INT),
+ META_INI(cmd_str1, struct xio_cmd, FIELD_STRING),
+ {}
+};
+
+int xio_send_aio(struct xio_socket *msock, struct aio_object *aio)
+{
+ struct xio_cmd cmd = {
+ .cmd_code = CMD_AIO,
+ .cmd_int1 = aio->io_id,
+ };
+ int seq = 0;
+ int status;
+
+ if (aio->io_rw != 0 && aio->io_data && aio->io_cs_mode < 2)
+ cmd.cmd_code |= CMD_FLAG_HAS_DATA;
+
+ get_lamport(&cmd.cmd_stamp);
+
+ status = desc_send_struct(msock, &cmd, xio_cmd_meta, true);
+ if (status < 0)
+ goto done;
+
+ seq = 0;
+ status = desc_send_struct(msock, aio, xio_aio_user_meta, cmd.cmd_code & CMD_FLAG_HAS_DATA);
+ if (status < 0)
+ goto done;
+
+ if (cmd.cmd_code & CMD_FLAG_HAS_DATA)
+ status = xio_send_compressed(msock, aio->io_data, aio->io_len, xio_net_compress_data, false);
+done:
+ return status;
+}
+
+int xio_recv_aio(struct xio_socket *msock, struct aio_object *aio, struct xio_cmd *cmd)
+{
+ int status;
+
+ status = desc_recv_struct(msock, aio, xio_aio_user_meta, __LINE__);
+ if (status < 0)
+ goto done;
+
+ set_lamport(&cmd->cmd_stamp);
+
+ if (cmd->cmd_code & CMD_FLAG_HAS_DATA) {
+ if (!aio->io_data)
+ aio->io_data = brick_block_alloc(0, aio->io_len);
+ status = xio_recv_compressed(msock, aio->io_data, aio->io_len, aio->io_len);
+ if (unlikely(status < 0))
+ XIO_WRN("#%d aio_len = %d, status = %d\n", msock->s_debug_nr, aio->io_len, status);
+ }
+done:
+ return status;
+}
+
+int xio_send_cb(struct xio_socket *msock, struct aio_object *aio)
+{
+ struct xio_cmd cmd = {
+ .cmd_code = CMD_CB,
+ .cmd_int1 = aio->io_id,
+ };
+ int seq = 0;
+ int status;
+
+ if (aio->io_rw == 0 && aio->io_data && aio->io_cs_mode < 2)
+ cmd.cmd_code |= CMD_FLAG_HAS_DATA;
+
+ get_lamport(&cmd.cmd_stamp);
+
+ status = desc_send_struct(msock, &cmd, xio_cmd_meta, true);
+ if (status < 0)
+ goto done;
+
+ seq = 0;
+ status = desc_send_struct(msock, aio, xio_aio_user_meta, cmd.cmd_code & CMD_FLAG_HAS_DATA);
+ if (status < 0)
+ goto done;
+
+ if (cmd.cmd_code & CMD_FLAG_HAS_DATA)
+ status = xio_send_compressed(msock, aio->io_data, aio->io_len, xio_net_compress_data, false);
+done:
+ return status;
+}
+
+int xio_recv_cb(struct xio_socket *msock, struct aio_object *aio, struct xio_cmd *cmd)
+{
+ int status;
+
+ status = desc_recv_struct(msock, aio, xio_aio_user_meta, __LINE__);
+ if (status < 0)
+ goto done;
+
+ set_lamport(&cmd->cmd_stamp);
+
+ if (cmd->cmd_code & CMD_FLAG_HAS_DATA) {
+ if (!aio->io_data) {
+ XIO_WRN("#%d no internal buffer available\n", msock->s_debug_nr);
+ status = -EINVAL;
+ goto done;
+ }
+ status = xio_recv_compressed(msock, aio->io_data, aio->io_len, aio->io_len);
+ }
+done:
+ return status;
+}
+
+/***************** module init stuff ************************/
+
+char *(*xio_translate_hostname)(const char *name) = NULL;
+
+bool xio_net_is_alive;
+
+int __init init_xio_net(void)
+{
+ XIO_INF("init_net()\n");
+ xio_net_is_alive = true;
+ return 0;
+}
+
+void exit_xio_net(void)
+{
+ xio_net_is_alive = false;
+ brick_string_free(id);
+ id = NULL;
+ XIO_INF("exit_net()\n");
+}
diff --git a/include/linux/xio/xio_net.h b/include/linux/xio/xio_net.h
new file mode 100644
index 0000000..083b75c
--- /dev/null
+++ b/include/linux/xio/xio_net.h
@@ -0,0 +1,171 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef XIO_NET_H
+#define XIO_NET_H
+
+#include <net/sock.h>
+#include <net/ipconfig.h>
+#include <net/tcp.h>
+
+#include <linux/brick/brick.h>
+
+extern int xio_net_compress_data;
+
+extern int xio_net_default_port;
+extern int xio_net_bind_before_listen;
+extern int xio_net_bind_before_connect;
+
+extern bool xio_net_is_alive;
+
+#define MAX_DESC_CACHE 16
+
+/* The original struct socket has no refcount. This leads to problems
+ * during long-lasting system calls when racing with socket shutdown.
+ *
+ * The original idea of struct xio_socket was just a small wrapper
+ * adding a refcount and some debugging aid.
+ * Later, some buffering was added in order to take advantage of
+ * kernel_sendpage().
+ * Caching of meta description has also been added.
+ *
+ * Notice: we have a slightly restricted parallelism model.
+ * One sender and one receiver thread may work in parallel
+ * on the same socket instance. At low level, there must not exist
+ * multiple readers in parallel to each other, or multiple
+ * writers in parallel to each other. Otherwise, higher level
+ * protocol sequences would be disturbed anyway.
+ * When needed, you may achieve higher parallelism by doing your own
+ * semaphore locking around xio_{send, recv}_struct() or even longer
+ * sequences of subsets of your high-level protocol.
+ */
+struct xio_socket {
+ struct socket *s_socket;
+
+ u64 s_send_bytes;
+ u64 s_recv_bytes;
+ void *s_buffer;
+ atomic_t s_count;
+ int s_pos;
+ int s_debug_nr;
+ int s_send_abort;
+ int s_recv_abort;
+ int s_send_cnt;
+ int s_recv_cnt;
+ bool s_shutdown_on_err;
+ bool s_alive;
+
+ u8 s_send_proto;
+ u8 s_recv_proto;
+ u16 s_send_flags;
+ u16 s_recv_flags;
+ struct xio_desc_cache *s_desc_send[MAX_DESC_CACHE];
+ struct xio_desc_cache *s_desc_recv[MAX_DESC_CACHE];
+};
+
+struct xio_tcp_params {
+ int ip_tos;
+ int tcp_window_size;
+ int tcp_nodelay;
+ int tcp_timeout;
+ int tcp_keepcnt;
+ int tcp_keepintvl;
+ int tcp_keepidle;
+};
+
+extern struct xio_tcp_params default_tcp_params;
+
+enum {
+ CMD_NOP,
+ CMD_NOTIFY,
+ CMD_CONNECT,
+ CMD_GETINFO,
+ CMD_GETENTS,
+ CMD_AIO,
+ CMD_CB,
+};
+
+#define CMD_FLAG_MASK 255
+#define CMD_FLAG_HAS_DATA 256
+
+struct xio_cmd {
+ struct timespec cmd_stamp; /* for automatic lamport clock */
+ int cmd_code;
+ int cmd_int1;
+
+ /* int cmd_int2; */
+ /* int cmd_int3; */
+ char *cmd_str1;
+
+ /* char *cmd_str2; */
+ /* char *cmd_str3; */
+};
+
+extern const struct meta xio_cmd_meta[];
+
+extern char *(*xio_translate_hostname)(const char *name);
+
+extern char *my_id(void);
+
+/* Low-level network traffic
+ */
+extern int xio_create_sockaddr(struct sockaddr_storage *addr, const char *spec);
+
+extern int xio_create_socket(struct xio_socket *msock,
+ struct sockaddr_storage *src_addr,
+ struct sockaddr_storage *dst_addr);
+
+extern int xio_accept_socket(struct xio_socket *new_msock, struct xio_socket *old_msock);
+extern bool xio_get_socket(struct xio_socket *msock);
+extern void xio_put_socket(struct xio_socket *msock);
+extern void xio_shutdown_socket(struct xio_socket *msock);
+extern bool xio_socket_is_alive(struct xio_socket *msock);
+extern long xio_socket_send_space_available(struct xio_socket *msock);
+
+extern int xio_send_raw(struct xio_socket *msock, const void *buf, int len, bool cork);
+extern int xio_recv_raw(struct xio_socket *msock, void *buf, int minlen, int maxlen);
+
+int xio_send_compressed(struct xio_socket *msock, const void *buf, s32 len, int compress, bool cork);
+int xio_recv_compressed(struct xio_socket *msock, void *buf, int minlen, int maxlen);
+
+/* Mid-level generic field data exchange
+ */
+extern int xio_send_struct(struct xio_socket *msock, const void *data, const struct meta *meta);
+#define xio_recv_struct(_sock_, _data_, _meta_) \
+ ({ \
+ _xio_recv_struct(_sock_, _data_, _meta_, __LINE__); \
+ })
+extern int _xio_recv_struct(struct xio_socket *msock, void *data, const struct meta *meta, int line);
+
+/* High-level transport of xio structures
+ */
+extern int xio_send_dent_list(struct xio_socket *msock, struct list_head *anchor);
+extern int xio_recv_dent_list(struct xio_socket *msock, struct list_head *anchor);
+
+extern int xio_send_aio(struct xio_socket *msock, struct aio_object *aio);
+extern int xio_recv_aio(struct xio_socket *msock, struct aio_object *aio, struct xio_cmd *cmd);
+extern int xio_send_cb(struct xio_socket *msock, struct aio_object *aio);
+extern int xio_recv_cb(struct xio_socket *msock, struct aio_object *aio, struct xio_cmd *cmd);
+
+/***********************************************************************/
+
+/* init */
+
+extern int init_xio_net(void);
+extern void exit_xio_net(void);
+
+#endif
--
2.6.4
--
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