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Message-Id: <20190117230313.20248-3-nicholas.d.nunley@intel.com>
Date: Thu, 17 Jan 2019 15:03:10 -0800
From: Nicholas Nunley <nicholas.d.nunley@...el.com>
To: linville@...driver.com
Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Nicholas Nunley <nicholas.d.nunley@...el.com>,
netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com
Subject: [ethtool 3/6] ethtool: introduce new ioctl for per-queue settings
Introduce a new ioctl for setting per-queue parameters.
Users can apply commands to specific queues by setting SUB_COMMAND and
queue_mask with the following ethtool command:
ethtool --set-perqueue-command DEVNAME [queue_mask %x] SUB_COMMAND
If queue_mask is not set, the SUB_COMMAND will be applied to all queues.
SUB_COMMANDs for per-queue settings will be implemented in following
patches.
Based on patch by Kan Liang <kan.liang@...el.com>
Signed-off-by: Nicholas Nunley <nicholas.d.nunley@...el.com>
---
ethtool.8.in | 20 ++++++++++
ethtool.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+)
diff --git a/ethtool.8.in b/ethtool.8.in
index 5a26cff..0aaca2c 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -391,6 +391,14 @@ ethtool \- query or control network driver and hardware settings
.I devname
.B encoding
.BR auto | off | rs | baser \ [...]
+.HP
+.B ethtool \-\-set\-perqueue\-command
+.I devname
+.RB [ queue_mask
+.IR %x ]
+.I sub_command
+.RB ...
+ .
.
.\" Adjust lines (i.e. full justification) and hyphenate.
.ad
@@ -1135,6 +1143,18 @@ RS Force RS-FEC encoding
BaseR Force BaseR encoding
.TE
.RE
+.TP
+.B \-\-set\-perqueue\-command
+Sets sub command to specific queues.
+.RS 4
+.TP
+.B queue_mask %x
+Sets the specific queues which the sub command is applied to.
+If queue_mask is not set, the sub command will be applied to all queues.
+.TP
+.B sub_command
+Sets the sub command.
+.RE
.SH BUGS
Not supported (in part or whole) on all network drivers.
.SH AUTHOR
diff --git a/ethtool.c b/ethtool.c
index 1f91303..e089981 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -5048,6 +5048,8 @@ static int do_sfec(struct cmd_context *ctx)
return 0;
}
+static int do_perqueue(struct cmd_context *ctx);
+
#ifndef TEST_ETHTOOL
int send_ioctl(struct cmd_context *ctx, void *cmd)
{
@@ -5243,6 +5245,8 @@ static const struct option {
{ "--show-fec", 1, do_gfec, "Show FEC settings"},
{ "--set-fec", 1, do_sfec, "Set FEC settings",
" [ encoding auto|off|rs|baser [...]]\n"},
+ { "--set-perqueue-command", 1, do_perqueue, "Set per queue command",
+ " [queue_mask %x] SUB_COMMAND\n"},
{ "-h|--help", 0, show_usage, "Show this help" },
{ "--version", 0, do_version, "Show version number" },
{}
@@ -5294,6 +5298,103 @@ static int find_option(int argc, char **argp)
return -1;
}
+static int set_queue_mask(u32 *queue_mask, char *str)
+{
+ int len = strlen(str);
+ int index = __KERNEL_DIV_ROUND_UP(len * 4, 32);
+ char tmp[9];
+ char *end = str + len;
+ int i, num;
+ __u32 mask;
+ int n_queues = 0;
+
+ if (len > MAX_NUM_QUEUE)
+ return -EINVAL;
+
+ for (i = 0; i < index; i++) {
+ num = end - str;
+
+ if (num >= 8) {
+ end -= 8;
+ num = 8;
+ } else {
+ end = str;
+ }
+ strncpy(tmp, end, num);
+ tmp[num] = '\0';
+
+ queue_mask[i] = strtoul(tmp, NULL, 16);
+
+ mask = queue_mask[i];
+ while (mask > 0) {
+ if (mask & 0x1)
+ n_queues++;
+ mask = mask >> 1;
+ }
+ }
+
+ return n_queues;
+}
+
+#define MAX(x, y) (x > y ? x : y)
+
+static int find_max_num_queues(struct cmd_context *ctx)
+{
+ struct ethtool_channels echannels;
+
+ echannels.cmd = ETHTOOL_GCHANNELS;
+ if (send_ioctl(ctx, &echannels))
+ return -1;
+
+ return MAX(MAX(echannels.rx_count, echannels.tx_count),
+ echannels.combined_count);
+}
+
+static int do_perqueue(struct cmd_context *ctx)
+{
+ __u32 queue_mask[__KERNEL_DIV_ROUND_UP(MAX_NUM_QUEUE, 32)] = {0};
+ int i, n_queues = 0;
+
+ if (ctx->argc == 0)
+ exit_bad_args();
+
+ /*
+ * The sub commands will be applied to
+ * all queues if no queue_mask set
+ */
+ if (strncmp(*ctx->argp, "queue_mask", 10)) {
+ n_queues = find_max_num_queues(ctx);
+ if (n_queues < 0) {
+ perror("Cannot get number of queues");
+ return -EFAULT;
+ }
+ for (i = 0; i < n_queues / 32; i++)
+ queue_mask[i] = ~0;
+ queue_mask[i] = (1 << (n_queues - i * 32)) - 1;
+ fprintf(stdout,
+ "The sub commands will be applied to all %d queues\n",
+ n_queues);
+ } else {
+ ctx->argc--;
+ ctx->argp++;
+ n_queues = set_queue_mask(queue_mask, *ctx->argp);
+ if (n_queues < 0) {
+ perror("Invalid queue mask");
+ return n_queues;
+ }
+ ctx->argc--;
+ ctx->argp++;
+ }
+
+ i = find_option(ctx->argc, ctx->argp);
+ if (i < 0)
+ exit_bad_args();
+
+ /* no sub_command support yet */
+
+ return 0;
+}
+
int main(int argc, char **argp)
{
int (*func)(struct cmd_context *);
--
2.20.1
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