The virtio driver for Linux guests will not set a link speed to its
paravirtualized NICs. This will be seen as -1 in the ethernet layer, and
when some servers (e.g. samba) fetches it, it's converted to an unsigned
value (and multiplied by 1000 * 1000), so in client side we end up with:
1) Speed: 4294967295000000 bps
in DebugData.
This patch introduces a helper that returns a speed string (in Mbps or
Gbps) if interface speed is valid (>= SPEED_10 and <= SPEED_800000), or
"Unknown" otherwise.
The reason to not change the value in iface->speed is because we don't
know the real speed of the HW backing the server NIC, so let's keep
considering these as the fastest NICs available.
Also print "Capabilities: None" when the interface doesn't support any.
Signed-off-by: Enzo Matsumiya <ematsumiya@xxxxxxx>
---
v2: remove dependency on CONFIG_PHYLIB by creating our own helper
fs/smb/client/cifs_debug.c | 47 +++++++++++++++++++++++++++++++++++++-
1 file changed, 46 insertions(+), 1 deletion(-)
diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c
index 5034b862cec2..c5d9579e1861 100644
--- a/fs/smb/client/cifs_debug.c
+++ b/fs/smb/client/cifs_debug.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
+#include <uapi/linux/ethtool.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
@@ -146,18 +147,62 @@ cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
atomic_read(&server->num_waiters));
}
+static inline const char *smb_speed_to_str(size_t bps)
+{
+ size_t mbps = bps / 1000 / 1000;
+
+ switch (mbps) {
+ case SPEED_10:
+ return "10Mbps";
+ case SPEED_100:
+ return "100Mbps";
+ case SPEED_1000:
+ return "1Gbps";
+ case SPEED_2500:
+ return "2.5Gbps";
+ case SPEED_5000:
+ return "5Gbps";
+ case SPEED_10000:
+ return "10Gbps";
+ case SPEED_14000:
+ return "14Gbps";
+ case SPEED_20000:
+ return "20Gbps";
+ case SPEED_25000:
+ return "25Gbps";
+ case SPEED_40000:
+ return "40Gbps";
+ case SPEED_50000:
+ return "50Gbps";
+ case SPEED_56000:
+ return "56Gbps";
+ case SPEED_100000:
+ return "100Gbps";
+ case SPEED_200000:
+ return "200Gbps";
+ case SPEED_400000:
+ return "400Gbps";
+ case SPEED_800000:
+ return "800Gbps";
+ default:
+ return "Unknown";
+ }
+}
+
static void
cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
{
struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
- seq_printf(m, "\tSpeed: %zu bps\n", iface->speed);
+ seq_printf(m, "\tSpeed: %s\n", smb_speed_to_str(iface->speed));
seq_puts(m, "\t\tCapabilities: ");
if (iface->rdma_capable)
seq_puts(m, "rdma ");
if (iface->rss_capable)
seq_puts(m, "rss ");
+ if (!iface->rdma_capable && !iface->rss_capable)
+ seq_puts(m, "None");
seq_putc(m, '\n');
if (iface->sockaddr.ss_family == AF_INET)
seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
--
2.40.1
