Parav Pandit
2021-Dec-17 08:08 UTC
[iproute2-next v2 4/4] vdpa: Enable user to set mtu of the vdpa device
Implement mtu setting for vdpa device.
$ vdpa mgmtdev show
vdpasim_net:
supported_classes net
Add the device with mac address and mtu:
$ vdpa dev add name bar mgmtdev vdpasim_net mac 00:11:22:33:44:55 mtu 9000
In above command only mac address or only mtu can also be set.
View the config after setting:
$ vdpa dev config show
bar: mac 00:11:22:33:44:55 link up link_announce false mtu 9000
Signed-off-by: Parav Pandit <parav at nvidia.com>
---
changelog:
v1->v2:
- use get_u16
- use strcmp() instead of matches()
- added man page
---
man/man8/vdpa-dev.8 | 10 ++++++++++
vdpa/vdpa.c | 28 ++++++++++++++++++++++++++--
2 files changed, 36 insertions(+), 2 deletions(-)
diff --git a/man/man8/vdpa-dev.8 b/man/man8/vdpa-dev.8
index 5c5ac469..aa21ae3a 100644
--- a/man/man8/vdpa-dev.8
+++ b/man/man8/vdpa-dev.8
@@ -32,6 +32,7 @@ vdpa-dev \- vdpa device configuration
.B mgmtdev
.I MGMTDEV
.RI "[ mac " MACADDR " ]"
+.RI "[ mtu " MTU " ]"
.ti -8
.B vdpa dev del
@@ -69,6 +70,10 @@ Name of the management device to use for device addition.
- specifies the mac address for the new vdpa device.
This is applicable only for the network type of vdpa device. This is optional.
+.BI mtu " MTU"
+- specifies the mtu for the new vdpa device.
+This is applicable only for the network type of vdpa device. This is optional.
+
.SS vdpa dev del - Delete the vdpa device.
.PP
@@ -109,6 +114,11 @@ vdpa dev add name foo mgmtdev vdpa_sim_net mac
00:11:22:33:44:55
Add the vdpa device named foo on the management device vdpa_sim_net with mac
address of 00:11:22:33:44:55.
.RE
.PP
+vdpa dev add name foo mgmtdev vdpa_sim_net mac 00:11:22:33:44:55 mtu 9000
+.RS 4
+Add the vdpa device named foo on the management device vdpa_sim_net with mac
address of 00:11:22:33:44:55 and mtu of 9000 bytes.
+.RE
+.PP
vdpa dev del foo
.RS 4
Delete the vdpa device named foo which was previously created.
diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 63d464d1..f048e470 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -22,6 +22,7 @@
#define VDPA_OPT_VDEV_NAME BIT(2)
#define VDPA_OPT_VDEV_HANDLE BIT(3)
#define VDPA_OPT_VDEV_MAC BIT(4)
+#define VDPA_OPT_VDEV_MTU BIT(5)
struct vdpa_opts {
uint64_t present; /* flags of present items */
@@ -30,6 +31,7 @@ struct vdpa_opts {
const char *vdev_name;
unsigned int device_id;
char mac[ETH_ALEN];
+ uint16_t mtu;
};
struct vdpa {
@@ -154,6 +156,17 @@ static int vdpa_argv_mac(struct vdpa *vdpa, int argc, char
**argv, char *mac)
return 0;
}
+static int vdpa_argv_u16(struct vdpa *vdpa, int argc, char **argv,
+ uint16_t *result)
+{
+ if (argc <= 0 || *argv == NULL) {
+ fprintf(stderr, "number expected\n");
+ return -EINVAL;
+ }
+
+ return get_u16(result, *argv, 10);
+}
+
struct vdpa_args_metadata {
uint64_t o_flag;
const char *err_msg;
@@ -204,6 +217,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa
*vdpa)
if (opts->present & VDPA_OPT_VDEV_MAC)
mnl_attr_put(nlh, VDPA_ATTR_DEV_NET_CFG_MACADDR,
sizeof(opts->mac), opts->mac);
+ if (opts->present & VDPA_OPT_VDEV_MTU)
+ mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MTU, opts->mtu);
}
static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
@@ -263,6 +278,15 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc,
char **argv,
NEXT_ARG_FWD();
o_found |= VDPA_OPT_VDEV_MAC;
+ } else if ((strcmp(*argv, "mtu") == 0) &&
+ (o_all & VDPA_OPT_VDEV_MTU)) {
+ NEXT_ARG_FWD();
+ err = vdpa_argv_u16(vdpa, argc, argv, &opts->mtu);
+ if (err)
+ return err;
+
+ NEXT_ARG_FWD();
+ o_found |= VDPA_OPT_VDEV_MTU;
} else {
fprintf(stderr, "Unknown option \"%s\"\n", *argv);
return -EINVAL;
@@ -443,7 +467,7 @@ static int cmd_mgmtdev(struct vdpa *vdpa, int argc, char
**argv)
static void cmd_dev_help(void)
{
fprintf(stderr, "Usage: vdpa dev show [ DEV ]\n");
- fprintf(stderr, " vdpa dev add name NAME mgmtdev MANAGEMENTDEV [
mac MACADDR ]\n");
+ fprintf(stderr, " vdpa dev add name NAME mgmtdev MANAGEMENTDEV [
mac MACADDR ] [ mtu MTU ]\n");
fprintf(stderr, " vdpa dev del DEV\n");
fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
}
@@ -533,7 +557,7 @@ static int cmd_dev_add(struct vdpa *vdpa, int argc, char
**argv)
NLM_F_REQUEST | NLM_F_ACK);
err = vdpa_argv_parse_put(nlh, vdpa, argc, argv,
VDPA_OPT_VDEV_MGMTDEV_HANDLE | VDPA_OPT_VDEV_NAME,
- VDPA_OPT_VDEV_MAC);
+ VDPA_OPT_VDEV_MAC | VDPA_OPT_VDEV_MTU);
if (err)
return err;
--
2.26.2
David Ahern
2021-Dec-18 20:53 UTC
[iproute2-next v2 4/4] vdpa: Enable user to set mtu of the vdpa device
On 12/17/21 1:08 AM, Parav Pandit wrote:> @@ -204,6 +217,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa) > if (opts->present & VDPA_OPT_VDEV_MAC) > mnl_attr_put(nlh, VDPA_ATTR_DEV_NET_CFG_MACADDR, > sizeof(opts->mac), opts->mac); > + if (opts->present & VDPA_OPT_VDEV_MTU) > + mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MTU, opts->mtu);Why limit the MTU to a u16? Eric for example is working on "Big TCP" where IPv6 can work with Jumbograms where mtu can be > 64k. https://datatracker.ietf.org/doc/html/rfc2675