[PATCH 13/14] cifs: display the endpoint IP details in DebugData

[nspmangalore@gmail.com]

From: Shyam Prasad N <sprasad@microsoft.com>

With multichannel, it is useful to know the src port details
for each channel. This change will print the ip addr and
port details for both the socket dest and src endpoints.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
---
 fs/smb/client/cifs_debug.c | 73 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 2 deletions(-)

diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c
index e23fcabb78d6..d8362e098310 100644
--- a/fs/smb/client/cifs_debug.c
+++ b/fs/smb/client/cifs_debug.c
@@ -13,6 +13,7 @@
 #include <linux/proc_fs.h>
 #include <linux/uaccess.h>
 #include <uapi/linux/ethtool.h>
+#include <net/inet_sock.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
 #include "cifsproto.h"
@@ -158,11 +159,37 @@ cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
 		   in_flight(server),
 		   atomic_read(&server->in_send),
 		   atomic_read(&server->num_waiters));
+
 #ifdef CONFIG_NET_NS
 	if (server->net)
 		seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
 #endif /* NET_NS */
 
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	if (!server->rdma)
+		goto skip_rdma;
+
+	if (server->smbd_conn && server->smbd_conn->id) {
+		struct rdma_addr *addr =
+			&server->smbd_conn->id->route.addr;
+		seq_printf(m, "\n\t\tIP addr: dst: %pISpc, src: %pISpc",
+			   &addr->dst_addr, &addr->src_addr);
+	}
+
+skip_rdma:
+#endif
+	if (server->ssocket) {
+		struct sockaddr src;
+		int addrlen;
+
+		addrlen = kernel_getsockname(server->ssocket, &src);
+		if (addrlen != sizeof(struct sockaddr_in) &&
+		    addrlen != sizeof(struct sockaddr_in6))
+			return;
+
+		seq_printf(m, "\n\t\tIP addr: dst: %pISpc, src: %pISpc",
+			   &server->dstaddr, &src);
+	}
 }
 
 static inline const char *smb_speed_to_str(size_t bps)
@@ -279,7 +306,7 @@ static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 {
 	struct mid_q_entry *mid_entry;
-	struct TCP_Server_Info *server;
+	struct TCP_Server_Info *server, *nserver;
 	struct TCP_Server_Info *chan_server;
 	struct cifs_ses *ses;
 	struct cifs_tcon *tcon;
@@ -336,7 +363,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 
 	c = 0;
 	spin_lock(&cifs_tcp_ses_lock);
-	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+	list_for_each_entry_safe(server, nserver, &cifs_tcp_ses_list, tcp_ses_list) {
 		/* channel info will be printed as a part of sessions below */
 		if (SERVER_IS_CHAN(server))
 			continue;
@@ -414,8 +441,39 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 		seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
 			atomic_read(&server->smbd_conn->mr_ready_count),
 			atomic_read(&server->smbd_conn->mr_used_count));
+		if (server->smbd_conn->id) {
+			struct rdma_addr *addr =
+				&server->smbd_conn->id->route.addr;
+			seq_printf(m, "\nIP addr: dst: %pISpc, src: %pISpc",
+				   &addr->dst_addr, &addr->src_addr);
+		}
 skip_rdma:
 #endif
+		if (server->ssocket) {
+			struct sockaddr src;
+			int addrlen;
+
+			/* kernel_getsockname can block. so drop the lock first */
+			server->srv_count++;
+			spin_unlock(&cifs_tcp_ses_lock);
+
+			addrlen = kernel_getsockname(server->ssocket, &src);
+			if (addrlen != sizeof(struct sockaddr_in) &&
+			    addrlen != sizeof(struct sockaddr_in6)) {
+				cifs_put_tcp_session(server, 0);
+				spin_lock(&cifs_tcp_ses_lock);
+
+				goto skip_addr_details;
+			}
+
+			seq_printf(m, "\nIP addr: dst: %pISpc, src: %pISpc",
+				   &server->dstaddr, &src);
+
+			cifs_put_tcp_session(server, 0);
+			spin_lock(&cifs_tcp_ses_lock);
+		}
+
+skip_addr_details:
 		seq_printf(m, "\nNumber of credits: %d,%d,%d Dialect 0x%x",
 			server->credits,
 			server->echo_credits,
@@ -515,7 +573,18 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 				seq_printf(m, "\n\n\tExtra Channels: %zu ",
 					   ses->chan_count-1);
 				for (j = 1; j < ses->chan_count; j++) {
+					/*
+					 * kernel_getsockname can block inside
+					 * cifs_dump_channel. so drop the lock first
+					 */
+					server->srv_count++;
+					spin_unlock(&cifs_tcp_ses_lock);
+
 					cifs_dump_channel(m, j, &ses->chans[j]);
+
+					cifs_put_tcp_session(server, 0);
+					spin_lock(&cifs_tcp_ses_lock);
+
 					if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
 						seq_puts(m, "\tDISCONNECTED ");
 					if (CIFS_CHAN_IN_RECONNECT(ses, j))
-- 
2.34.1