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cifs: change iface_list from array to sorted linked list
A server's published interface list can change over time, and needs to be updated. We've storing iface_list as a simple array, which makes it difficult to manipulate an existing list. With this change, iface_list is modified into a linked list of interfaces, which is kept sorted by speed. Also added a reference counter for an iface entry, so that each channel can maintain a backpointer to the iface and drop it easily when needed. Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Shyam Prasad N
Steve French
parent
9de74996a7
commit
aa45dadd34
@ -162,6 +162,8 @@ cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
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seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
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else if (iface->sockaddr.ss_family == AF_INET6)
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seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
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if (!iface->is_active)
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seq_puts(m, "\t\t[for-cleanup]\n");
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}
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static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
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@ -221,6 +223,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
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struct TCP_Server_Info *server;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifs_server_iface *iface;
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int c, i, j;
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seq_puts(m,
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@ -456,11 +459,10 @@ skip_rdma:
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if (ses->iface_count)
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seq_printf(m, "\n\n\tServer interfaces: %zu",
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ses->iface_count);
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for (j = 0; j < ses->iface_count; j++) {
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struct cifs_server_iface *iface;
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iface = &ses->iface_list[j];
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seq_printf(m, "\n\t%d)", j+1);
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j = 0;
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list_for_each_entry(iface, &ses->iface_list,
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iface_head) {
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seq_printf(m, "\n\t%d)", ++j);
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cifs_dump_iface(m, iface);
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if (is_ses_using_iface(ses, iface))
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seq_puts(m, "\t\t[CONNECTED]\n");
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@ -933,15 +933,67 @@ static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
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#endif
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struct cifs_server_iface {
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struct list_head iface_head;
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struct kref refcount;
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size_t speed;
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unsigned int rdma_capable : 1;
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unsigned int rss_capable : 1;
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unsigned int is_active : 1; /* unset if non existent */
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struct sockaddr_storage sockaddr;
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};
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/* release iface when last ref is dropped */
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static inline void
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release_iface(struct kref *ref)
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{
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struct cifs_server_iface *iface = container_of(ref,
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struct cifs_server_iface,
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refcount);
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list_del_init(&iface->iface_head);
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kfree(iface);
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}
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/*
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* compare two interfaces a and b
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* return 0 if everything matches.
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* return 1 if a has higher link speed, or rdma capable, or rss capable
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* return -1 otherwise.
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*/
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static inline int
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iface_cmp(struct cifs_server_iface *a, struct cifs_server_iface *b)
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{
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int cmp_ret = 0;
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WARN_ON(!a || !b);
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if (a->speed == b->speed) {
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if (a->rdma_capable == b->rdma_capable) {
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if (a->rss_capable == b->rss_capable) {
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cmp_ret = memcmp(&a->sockaddr, &b->sockaddr,
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sizeof(a->sockaddr));
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if (!cmp_ret)
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return 0;
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else if (cmp_ret > 0)
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return 1;
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else
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return -1;
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} else if (a->rss_capable > b->rss_capable)
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return 1;
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else
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return -1;
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} else if (a->rdma_capable > b->rdma_capable)
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return 1;
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else
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return -1;
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} else if (a->speed > b->speed)
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return 1;
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else
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return -1;
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}
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struct cifs_chan {
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unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
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struct TCP_Server_Info *server;
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struct cifs_server_iface *iface; /* interface in use */
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__u8 signkey[SMB3_SIGN_KEY_SIZE];
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};
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@ -993,7 +1045,7 @@ struct cifs_ses {
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*/
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spinlock_t iface_lock;
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/* ========= begin: protected by iface_lock ======== */
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struct cifs_server_iface *iface_list;
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struct list_head iface_list;
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size_t iface_count;
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unsigned long iface_last_update; /* jiffies */
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/* ========= end: protected by iface_lock ======== */
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@ -1894,9 +1894,11 @@ void cifs_put_smb_ses(struct cifs_ses *ses)
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int i;
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for (i = 1; i < chan_count; i++) {
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spin_unlock(&ses->chan_lock);
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if (ses->chans[i].iface) {
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kref_put(&ses->chans[i].iface->refcount, release_iface);
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ses->chans[i].iface = NULL;
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}
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cifs_put_tcp_session(ses->chans[i].server, 0);
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spin_lock(&ses->chan_lock);
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ses->chans[i].server = NULL;
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}
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}
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@ -75,6 +75,7 @@ sesInfoAlloc(void)
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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mutex_init(&ret_buf->session_mutex);
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spin_lock_init(&ret_buf->iface_lock);
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INIT_LIST_HEAD(&ret_buf->iface_list);
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spin_lock_init(&ret_buf->chan_lock);
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}
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return ret_buf;
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@ -83,6 +84,8 @@ sesInfoAlloc(void)
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void
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sesInfoFree(struct cifs_ses *buf_to_free)
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{
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struct cifs_server_iface *iface = NULL, *niface = NULL;
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if (buf_to_free == NULL) {
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cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
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return;
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@ -96,7 +99,11 @@ sesInfoFree(struct cifs_ses *buf_to_free)
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kfree(buf_to_free->user_name);
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kfree(buf_to_free->domainName);
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kfree_sensitive(buf_to_free->auth_key.response);
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kfree(buf_to_free->iface_list);
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spin_lock(&buf_to_free->iface_lock);
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list_for_each_entry_safe(iface, niface, &buf_to_free->iface_list,
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iface_head)
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kref_put(&iface->refcount, release_iface);
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spin_unlock(&buf_to_free->iface_lock);
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kfree_sensitive(buf_to_free);
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}
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@ -58,7 +58,7 @@ bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
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spin_lock(&ses->chan_lock);
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for (i = 0; i < ses->chan_count; i++) {
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if (is_server_using_iface(ses->chans[i].server, iface)) {
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if (ses->chans[i].iface == iface) {
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spin_unlock(&ses->chan_lock);
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return true;
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}
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@ -151,11 +151,9 @@ int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
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{
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int old_chan_count, new_chan_count;
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int left;
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int i = 0;
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int rc = 0;
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int tries = 0;
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struct cifs_server_iface *ifaces = NULL;
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size_t iface_count;
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struct cifs_server_iface *iface = NULL, *niface = NULL;
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spin_lock(&ses->chan_lock);
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@ -184,33 +182,17 @@ int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
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}
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spin_unlock(&ses->chan_lock);
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/*
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* Make a copy of the iface list at the time and use that
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* instead so as to not hold the iface spinlock for opening
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* channels
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*/
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spin_lock(&ses->iface_lock);
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iface_count = ses->iface_count;
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if (iface_count <= 0) {
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spin_unlock(&ses->iface_lock);
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cifs_dbg(VFS, "no iface list available to open channels\n");
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return 0;
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}
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ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
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GFP_ATOMIC);
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if (!ifaces) {
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spin_unlock(&ses->iface_lock);
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return 0;
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}
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spin_unlock(&ses->iface_lock);
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/*
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* Keep connecting to same, fastest, iface for all channels as
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* long as its RSS. Try next fastest one if not RSS or channel
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* creation fails.
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*/
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spin_lock(&ses->iface_lock);
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iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
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iface_head);
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spin_unlock(&ses->iface_lock);
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while (left > 0) {
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struct cifs_server_iface *iface;
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tries++;
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if (tries > 3*ses->chan_max) {
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@ -219,27 +201,46 @@ int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
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break;
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}
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iface = &ifaces[i];
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if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
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i = (i+1) % iface_count;
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continue;
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spin_lock(&ses->iface_lock);
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if (!ses->iface_count) {
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spin_unlock(&ses->iface_lock);
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break;
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}
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rc = cifs_ses_add_channel(cifs_sb, ses, iface);
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if (rc) {
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cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
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i, rc);
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i = (i+1) % iface_count;
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continue;
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}
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list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
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iface_head) {
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/* skip ifaces that are unusable */
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if (!iface->is_active ||
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(is_ses_using_iface(ses, iface) &&
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!iface->rss_capable)) {
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continue;
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}
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/* take ref before unlock */
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kref_get(&iface->refcount);
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spin_unlock(&ses->iface_lock);
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rc = cifs_ses_add_channel(cifs_sb, ses, iface);
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spin_lock(&ses->iface_lock);
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if (rc) {
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cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
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&iface->sockaddr,
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rc);
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kref_put(&iface->refcount, release_iface);
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continue;
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}
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cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
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&iface->sockaddr);
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break;
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}
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spin_unlock(&ses->iface_lock);
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cifs_dbg(FYI, "successfully opened new channel on iface#%d\n",
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i);
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left--;
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new_chan_count++;
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}
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kfree(ifaces);
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return new_chan_count - old_chan_count;
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}
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@ -355,6 +356,7 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
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spin_unlock(&ses->chan_lock);
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goto out;
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}
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chan->iface = iface;
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ses->chan_count++;
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atomic_set(&ses->chan_seq, 0);
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@ -512,30 +512,135 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
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static int
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parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
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size_t buf_len,
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struct cifs_server_iface **iface_list,
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size_t *iface_count)
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struct cifs_ses *ses)
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{
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struct network_interface_info_ioctl_rsp *p;
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struct sockaddr_in *addr4;
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struct sockaddr_in6 *addr6;
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struct iface_info_ipv4 *p4;
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struct iface_info_ipv6 *p6;
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struct cifs_server_iface *info;
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struct cifs_server_iface *info = NULL, *iface = NULL, *niface = NULL;
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struct cifs_server_iface tmp_iface;
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ssize_t bytes_left;
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size_t next = 0;
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int nb_iface = 0;
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int rc = 0;
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*iface_list = NULL;
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*iface_count = 0;
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/*
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* Fist pass: count and sanity check
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*/
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int rc = 0, ret = 0;
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bytes_left = buf_len;
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p = buf;
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spin_lock(&ses->iface_lock);
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/*
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* Go through iface_list and do kref_put to remove
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* any unused ifaces. ifaces in use will be removed
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* when the last user calls a kref_put on it
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*/
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list_for_each_entry_safe(iface, niface, &ses->iface_list,
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iface_head) {
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iface->is_active = 0;
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kref_put(&iface->refcount, release_iface);
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}
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spin_unlock(&ses->iface_lock);
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while (bytes_left >= sizeof(*p)) {
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memset(&tmp_iface, 0, sizeof(tmp_iface));
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tmp_iface.speed = le64_to_cpu(p->LinkSpeed);
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tmp_iface.rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
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tmp_iface.rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
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switch (p->Family) {
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/*
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* The kernel and wire socket structures have the same
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* layout and use network byte order but make the
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* conversion explicit in case either one changes.
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*/
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case INTERNETWORK:
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addr4 = (struct sockaddr_in *)&tmp_iface.sockaddr;
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p4 = (struct iface_info_ipv4 *)p->Buffer;
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addr4->sin_family = AF_INET;
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memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
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/* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
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addr4->sin_port = cpu_to_be16(CIFS_PORT);
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cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
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&addr4->sin_addr);
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break;
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case INTERNETWORKV6:
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addr6 = (struct sockaddr_in6 *)&tmp_iface.sockaddr;
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p6 = (struct iface_info_ipv6 *)p->Buffer;
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addr6->sin6_family = AF_INET6;
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memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
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/* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
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addr6->sin6_flowinfo = 0;
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addr6->sin6_scope_id = 0;
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addr6->sin6_port = cpu_to_be16(CIFS_PORT);
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cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
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&addr6->sin6_addr);
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break;
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default:
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cifs_dbg(VFS,
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"%s: skipping unsupported socket family\n",
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__func__);
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goto next_iface;
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}
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/*
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* The iface_list is assumed to be sorted by speed.
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* Check if the new interface exists in that list.
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* NEVER change iface. it could be in use.
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* Add a new one instead
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*/
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spin_lock(&ses->iface_lock);
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iface = niface = NULL;
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list_for_each_entry_safe(iface, niface, &ses->iface_list,
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iface_head) {
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ret = iface_cmp(iface, &tmp_iface);
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if (!ret) {
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/* just get a ref so that it doesn't get picked/freed */
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iface->is_active = 1;
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kref_get(&iface->refcount);
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spin_unlock(&ses->iface_lock);
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goto next_iface;
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} else if (ret < 0) {
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/* all remaining ifaces are slower */
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kref_get(&iface->refcount);
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break;
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}
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}
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spin_unlock(&ses->iface_lock);
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/* no match. insert the entry in the list */
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info = kmalloc(sizeof(struct cifs_server_iface),
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GFP_KERNEL);
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if (!info) {
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rc = -ENOMEM;
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goto out;
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}
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memcpy(info, &tmp_iface, sizeof(tmp_iface));
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/* add this new entry to the list */
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kref_init(&info->refcount);
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info->is_active = 1;
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cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, ses->iface_count);
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cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
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cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
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le32_to_cpu(p->Capability));
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spin_lock(&ses->iface_lock);
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if (!list_entry_is_head(iface, &ses->iface_list, iface_head)) {
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list_add_tail(&info->iface_head, &iface->iface_head);
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kref_put(&iface->refcount, release_iface);
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} else
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list_add_tail(&info->iface_head, &ses->iface_list);
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spin_unlock(&ses->iface_lock);
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||||
|
||||
ses->iface_count++;
|
||||
ses->iface_last_update = jiffies;
|
||||
next_iface:
|
||||
nb_iface++;
|
||||
next = le32_to_cpu(p->Next);
|
||||
if (!next) {
|
||||
@ -557,108 +662,21 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
|
||||
cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
|
||||
|
||||
|
||||
/*
|
||||
* Second pass: extract info to internal structure
|
||||
*/
|
||||
|
||||
*iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
|
||||
if (!*iface_list) {
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
info = *iface_list;
|
||||
bytes_left = buf_len;
|
||||
p = buf;
|
||||
while (bytes_left >= sizeof(*p)) {
|
||||
info->speed = le64_to_cpu(p->LinkSpeed);
|
||||
info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
|
||||
info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
|
||||
|
||||
cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
|
||||
cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
|
||||
cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
|
||||
le32_to_cpu(p->Capability));
|
||||
|
||||
switch (p->Family) {
|
||||
/*
|
||||
* The kernel and wire socket structures have the same
|
||||
* layout and use network byte order but make the
|
||||
* conversion explicit in case either one changes.
|
||||
*/
|
||||
case INTERNETWORK:
|
||||
addr4 = (struct sockaddr_in *)&info->sockaddr;
|
||||
p4 = (struct iface_info_ipv4 *)p->Buffer;
|
||||
addr4->sin_family = AF_INET;
|
||||
memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
|
||||
|
||||
/* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
|
||||
addr4->sin_port = cpu_to_be16(CIFS_PORT);
|
||||
|
||||
cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
|
||||
&addr4->sin_addr);
|
||||
break;
|
||||
case INTERNETWORKV6:
|
||||
addr6 = (struct sockaddr_in6 *)&info->sockaddr;
|
||||
p6 = (struct iface_info_ipv6 *)p->Buffer;
|
||||
addr6->sin6_family = AF_INET6;
|
||||
memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
|
||||
|
||||
/* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
|
||||
addr6->sin6_flowinfo = 0;
|
||||
addr6->sin6_scope_id = 0;
|
||||
addr6->sin6_port = cpu_to_be16(CIFS_PORT);
|
||||
|
||||
cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
|
||||
&addr6->sin6_addr);
|
||||
break;
|
||||
default:
|
||||
cifs_dbg(VFS,
|
||||
"%s: skipping unsupported socket family\n",
|
||||
__func__);
|
||||
goto next_iface;
|
||||
}
|
||||
|
||||
(*iface_count)++;
|
||||
info++;
|
||||
next_iface:
|
||||
next = le32_to_cpu(p->Next);
|
||||
if (!next)
|
||||
break;
|
||||
p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
|
||||
bytes_left -= next;
|
||||
}
|
||||
|
||||
if (!*iface_count) {
|
||||
if (!ses->iface_count) {
|
||||
rc = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
out:
|
||||
if (rc) {
|
||||
kfree(*iface_list);
|
||||
*iface_count = 0;
|
||||
*iface_list = NULL;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int compare_iface(const void *ia, const void *ib)
|
||||
{
|
||||
const struct cifs_server_iface *a = (struct cifs_server_iface *)ia;
|
||||
const struct cifs_server_iface *b = (struct cifs_server_iface *)ib;
|
||||
|
||||
return a->speed == b->speed ? 0 : (a->speed > b->speed ? -1 : 1);
|
||||
}
|
||||
|
||||
static int
|
||||
SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
|
||||
{
|
||||
int rc;
|
||||
unsigned int ret_data_len = 0;
|
||||
struct network_interface_info_ioctl_rsp *out_buf = NULL;
|
||||
struct cifs_server_iface *iface_list;
|
||||
size_t iface_count;
|
||||
struct cifs_ses *ses = tcon->ses;
|
||||
|
||||
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
|
||||
@ -674,21 +692,10 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
|
||||
goto out;
|
||||
}
|
||||
|
||||
rc = parse_server_interfaces(out_buf, ret_data_len,
|
||||
&iface_list, &iface_count);
|
||||
rc = parse_server_interfaces(out_buf, ret_data_len, ses);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
/* sort interfaces from fastest to slowest */
|
||||
sort(iface_list, iface_count, sizeof(*iface_list), compare_iface, NULL);
|
||||
|
||||
spin_lock(&ses->iface_lock);
|
||||
kfree(ses->iface_list);
|
||||
ses->iface_list = iface_list;
|
||||
ses->iface_count = iface_count;
|
||||
ses->iface_last_update = jiffies;
|
||||
spin_unlock(&ses->iface_lock);
|
||||
|
||||
out:
|
||||
kfree(out_buf);
|
||||
return rc;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user