[PATCH v7 0/4] vdpa tool enhancements

[PATCH v7 0/4] vdpa tool enhancements

[Eli Cohen]

Hi,

The following four patch series enhances vdpa to show negotiated
features for a vdpa device, max features for a management device and
allows to configure max number of virtqueue pairs.

v6->v7:
Fix minor checkpatch warning


Eli Cohen (4):
  vdpa: Remove unsupported command line option
  vdpa: Allow for printing negotiated features of a device
  vdpa: Support for configuring max VQ pairs for a device
  vdpa: Support reading device features

 vdpa/vdpa.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 144 insertions(+), 6 deletions(-)

-- 
2.35.1

[PATCH v7 1/4] vdpa: Remove unsupported command line option

[Eli Cohen]

"-v[erbose]" option is not supported.
Remove it.

Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jianbo Liu <jianbol@mellanox.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
---
 vdpa/vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index f048e470c929..4ccb564872a0 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -711,7 +711,7 @@ static void help(void)
 	fprintf(stderr,
 		"Usage: vdpa [ OPTIONS ] OBJECT { COMMAND | help }\n"
 		"where  OBJECT := { mgmtdev | dev }\n"
-		"       OPTIONS := { -V[ersion] | -n[o-nice-names] | -j[son] | -p[retty] | -v[erbose] }\n");
+		"       OPTIONS := { -V[ersion] | -n[o-nice-names] | -j[son] | -p[retty] }\n");
 }
 
 static int vdpa_cmd(struct vdpa *vdpa, int argc, char **argv)
-- 
2.35.1

[PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Eli Cohen]

When reading the configuration of a vdpa device, check if the
VDPA_ATTR_DEV_NEGOTIATED_FEATURES is available. If it is, parse the
feature bits and print a string representation of each of the feature
bits.

We keep the strings in two different arrays. One for net device related
devices and one for generic feature bits.

In this patch we parse only net device specific features. Support for
other devices can be added later. If the device queried is not a net
device, we print its bit number only.

Examples:
1. Standard presentation
$ vdpa dev config show vdpa-a
vdpa-a: mac 00:00:00:00:88:88 link up link_announce false max_vq_pairs 2 mtu 9000
  negotiated_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS \
CTRL_VQ MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

2. json output
$ vdpa -j dev config show vdpa-a
{"config":{"vdpa-a":{"mac":"00:00:00:00:88:88","link":"up","link_announce":false,\
"max_vq_pairs":2,"mtu":9000,"negotiated_features":["CSUM","GUEST_CSUM",\
"MTU","MAC","HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ","CTRL_MAC_ADDR",\
"VERSION_1","ACCESS_PLATFORM"]}}}

3. Pretty json
$ vdpa -jp dev config show vdpa-a
{
    "config": {
        "vdpa-a": {
            "mac": "00:00:00:00:88:88",
            "link ": "up",
            "link_announce ": false,
            "max_vq_pairs": 2,
            "mtu": 9000,
            "negotiated_features": [
"CSUM","GUEST_CSUM","MTU","MAC","HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ",\
"MQ","CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM" ]
        }
    }
}

Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
---
 vdpa/vdpa.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 106 insertions(+), 2 deletions(-)

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 4ccb564872a0..f7b6e5f8a0bc 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -10,6 +10,8 @@
 #include <linux/virtio_net.h>
 #include <linux/netlink.h>
 #include <libmnl/libmnl.h>
+#include <linux/virtio_ring.h>
+#include <linux/virtio_config.h>
 #include "mnl_utils.h"
 #include <rt_names.h>
 
@@ -78,6 +80,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
 	[VDPA_ATTR_DEV_VENDOR_ID] = MNL_TYPE_U32,
 	[VDPA_ATTR_DEV_MAX_VQS] = MNL_TYPE_U32,
 	[VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
+	[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
 };
 
 static int attr_cb(const struct nlattr *attr, void *data)
@@ -385,6 +388,97 @@ static const char *parse_class(int num)
 	return class ? class : "< unknown class >";
 }
 
+static const char * const net_feature_strs[64] = {
+	[VIRTIO_NET_F_CSUM] = "CSUM",
+	[VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
+	[VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
+	[VIRTIO_NET_F_MTU] = "MTU",
+	[VIRTIO_NET_F_MAC] = "MAC",
+	[VIRTIO_NET_F_GUEST_TSO4] = "GUEST_TSO4",
+	[VIRTIO_NET_F_GUEST_TSO6] = "GUEST_TSO6",
+	[VIRTIO_NET_F_GUEST_ECN] = "GUEST_ECN",
+	[VIRTIO_NET_F_GUEST_UFO] = "GUEST_UFO",
+	[VIRTIO_NET_F_HOST_TSO4] = "HOST_TSO4",
+	[VIRTIO_NET_F_HOST_TSO6] = "HOST_TSO6",
+	[VIRTIO_NET_F_HOST_ECN] = "HOST_ECN",
+	[VIRTIO_NET_F_HOST_UFO] = "HOST_UFO",
+	[VIRTIO_NET_F_MRG_RXBUF] = "MRG_RXBUF",
+	[VIRTIO_NET_F_STATUS] = "STATUS",
+	[VIRTIO_NET_F_CTRL_VQ] = "CTRL_VQ",
+	[VIRTIO_NET_F_CTRL_RX] = "CTRL_RX",
+	[VIRTIO_NET_F_CTRL_VLAN] = "CTRL_VLAN",
+	[VIRTIO_NET_F_CTRL_RX_EXTRA] = "CTRL_RX_EXTRA",
+	[VIRTIO_NET_F_GUEST_ANNOUNCE] = "GUEST_ANNOUNCE",
+	[VIRTIO_NET_F_MQ] = "MQ",
+	[VIRTIO_F_NOTIFY_ON_EMPTY] = "NOTIFY_ON_EMPTY",
+	[VIRTIO_NET_F_CTRL_MAC_ADDR] = "CTRL_MAC_ADDR",
+	[VIRTIO_F_ANY_LAYOUT] = "ANY_LAYOUT",
+	[VIRTIO_NET_F_RSC_EXT] = "RSC_EXT",
+	[VIRTIO_NET_F_HASH_REPORT] = "HASH_REPORT",
+	[VIRTIO_NET_F_RSS] = "RSS",
+	[VIRTIO_NET_F_STANDBY] = "STANDBY",
+	[VIRTIO_NET_F_SPEED_DUPLEX] = "SPEED_DUPLEX",
+};
+
+#define VIRTIO_F_IN_ORDER 35
+#define VIRTIO_F_NOTIFICATION_DATA 38
+#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
+			      VIRTIO_TRANSPORT_F_START + 1)
+
+static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
+	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
+	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
+	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
+	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
+	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
+	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
+	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
+	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
+	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",
+};
+
+static const char * const *dev_to_feature_str[] = {
+	[VIRTIO_ID_NET] = net_feature_strs,
+};
+
+#define NUM_FEATURE_BITS 64
+
+static void print_features(struct vdpa *vdpa, uint64_t features, bool mgmtdevf,
+			   uint16_t dev_id)
+{
+	const char * const *feature_strs = NULL;
+	const char *s;
+	int i;
+
+	if (dev_id < ARRAY_SIZE(dev_to_feature_str))
+		feature_strs = dev_to_feature_str[dev_id];
+
+	if (mgmtdevf)
+		pr_out_array_start(vdpa, "dev_features");
+	else
+		pr_out_array_start(vdpa, "negotiated_features");
+
+	for (i = 0; i < NUM_FEATURE_BITS; i++) {
+		if (!(features & (1ULL << i)))
+			continue;
+
+		if (i < VIRTIO_TRANSPORT_F_START || i > VIRTIO_TRANSPORT_F_END) {
+			if (feature_strs)
+				s = feature_strs[i];
+			else
+				s = NULL;
+		} else {
+			s = ext_feature_strs[i - VIRTIO_TRANSPORT_F_START];
+		}
+		if (!s)
+			print_uint(PRINT_ANY, NULL, " bit_%d", i);
+		else
+			print_string(PRINT_ANY, NULL, " %s", s);
+	}
+
+	pr_out_array_end(vdpa);
+}
+
 static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
 				struct nlattr **tb)
 {
@@ -579,9 +673,10 @@ static int cmd_dev_del(struct vdpa *vdpa,  int argc, char **argv)
 	return mnlu_gen_socket_sndrcv(&vdpa->nlg, nlh, NULL, NULL);
 }
 
-static void pr_out_dev_net_config(struct nlattr **tb)
+static void pr_out_dev_net_config(struct vdpa *vdpa, struct nlattr **tb)
 {
 	SPRINT_BUF(macaddr);
+	uint64_t val_u64;
 	uint16_t val_u16;
 
 	if (tb[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
@@ -610,6 +705,15 @@ static void pr_out_dev_net_config(struct nlattr **tb)
 		val_u16 = mnl_attr_get_u16(tb[VDPA_ATTR_DEV_NET_CFG_MTU]);
 		print_uint(PRINT_ANY, "mtu", "mtu %d ", val_u16);
 	}
+	if (tb[VDPA_ATTR_DEV_NEGOTIATED_FEATURES]) {
+		uint16_t dev_id = 0;
+
+		if (tb[VDPA_ATTR_DEV_ID])
+			dev_id = mnl_attr_get_u32(tb[VDPA_ATTR_DEV_ID]);
+
+		val_u64 = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_NEGOTIATED_FEATURES]);
+		print_features(vdpa, val_u64, false, dev_id);
+	}
 }
 
 static void pr_out_dev_config(struct vdpa *vdpa, struct nlattr **tb)
@@ -619,7 +723,7 @@ static void pr_out_dev_config(struct vdpa *vdpa, struct nlattr **tb)
 	pr_out_vdev_handle_start(vdpa, tb);
 	switch (device_id) {
 	case VIRTIO_ID_NET:
-		pr_out_dev_net_config(tb);
+		pr_out_dev_net_config(vdpa, tb);
 		break;
 	default:
 		break;
-- 
2.35.1

[PATCH v7 3/4] vdpa: Support for configuring max VQ pairs for a device

[Eli Cohen]

Use VDPA_ATTR_DEV_MGMTDEV_MAX_VQS to specify max number of virtqueue
pairs to configure for a vdpa device when adding a device.

Examples:
1. Create a device with 3 virtqueue pairs:
$ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 max_vqp 3

2. Read the configuration of a vdpa device
$ vdpa dev config show vdpa-a
  vdpa-a: mac 00:00:00:00:88:88 link up link_announce false max_vq_pairs 3 \
          mtu 1500
  negotiated_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS \
                      CTRL_VQ MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
---
 vdpa/vdpa.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index f7b6e5f8a0bc..c2b1207af8cf 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -25,6 +25,7 @@
 #define VDPA_OPT_VDEV_HANDLE		BIT(3)
 #define VDPA_OPT_VDEV_MAC		BIT(4)
 #define VDPA_OPT_VDEV_MTU		BIT(5)
+#define VDPA_OPT_MAX_VQP		BIT(6)
 
 struct vdpa_opts {
 	uint64_t present; /* flags of present items */
@@ -34,6 +35,7 @@ struct vdpa_opts {
 	unsigned int device_id;
 	char mac[ETH_ALEN];
 	uint16_t mtu;
+	uint16_t max_vqp;
 };
 
 struct vdpa {
@@ -81,6 +83,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
 	[VDPA_ATTR_DEV_MAX_VQS] = MNL_TYPE_U32,
 	[VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
 	[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
+	[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
 };
 
 static int attr_cb(const struct nlattr *attr, void *data)
@@ -222,6 +225,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa)
 			     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);
+	if (opts->present & VDPA_OPT_MAX_VQP)
+		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, opts->max_vqp);
 }
 
 static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
@@ -290,6 +295,14 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
 
 			NEXT_ARG_FWD();
 			o_found |= VDPA_OPT_VDEV_MTU;
+		} else if ((matches(*argv, "max_vqp")  == 0) && (o_optional & VDPA_OPT_MAX_VQP)) {
+			NEXT_ARG_FWD();
+			err = vdpa_argv_u16(vdpa, argc, argv, &opts->max_vqp);
+			if (err)
+				return err;
+
+			NEXT_ARG_FWD();
+			o_found |= VDPA_OPT_MAX_VQP;
 		} else {
 			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
 			return -EINVAL;
@@ -502,6 +515,14 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
 		pr_out_array_end(vdpa);
 	}
 
+	if (tb[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS]) {
+		uint32_t num_vqs;
+
+		print_nl();
+		num_vqs = mnl_attr_get_u32(tb[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS]);
+		print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
+	}
+
 	pr_out_handle_end(vdpa);
 }
 
@@ -562,6 +583,7 @@ 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 ] [ mtu MTU ]\n");
+	fprintf(stderr, "                                                    [ max_vqp MAX_VQ_PAIRS ]\n");
 	fprintf(stderr, "       vdpa dev del DEV\n");
 	fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
 }
@@ -651,7 +673,8 @@ 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_MTU);
+				  VDPA_OPT_VDEV_MAC | VDPA_OPT_VDEV_MTU |
+				  VDPA_OPT_MAX_VQP);
 	if (err)
 		return err;
 
-- 
2.35.1

[PATCH v7 4/4] vdpa: Support reading device features

[Eli Cohen]

When showing the available management devices, check if
VDPA_ATTR_DEV_SUPPORTED_FEATURES feature is available and print the
supported features for a management device.

Examples:
$ vdpa mgmtdev show
auxiliary/mlx5_core.sf.1:
  supported_classes net
  max_supported_vqs 257
  dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ MQ \
               CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

$ vdpa -jp mgmtdev show
{
    "mgmtdev": {
        "auxiliary/mlx5_core.sf.1": {
            "supported_classes": [ "net" ],
            "max_supported_vqs": 257,
            "dev_features": [
"CSUM","GUEST_CSUM","MTU","HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ",\
"CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM" ]
        }
    }
}

Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
---
 vdpa/vdpa.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index c2b1207af8cf..ffda00e85c26 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -84,6 +84,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
 	[VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
 	[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
 	[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
+	[VDPA_ATTR_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
 };
 
 static int attr_cb(const struct nlattr *attr, void *data)
@@ -495,14 +496,14 @@ static void print_features(struct vdpa *vdpa, uint64_t features, bool mgmtdevf,
 static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
 				struct nlattr **tb)
 {
+	uint64_t classes = 0;
 	const char *class;
 	unsigned int i;
 
 	pr_out_handle_start(vdpa, tb);
 
 	if (tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]) {
-		uint64_t classes = mnl_attr_get_u64(tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]);
-
+		classes = mnl_attr_get_u64(tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]);
 		pr_out_array_start(vdpa, "supported_classes");
 
 		for (i = 1; i < 64; i++) {
@@ -523,6 +524,16 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
 		print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
 	}
 
+	if (tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]) {
+		uint64_t features;
+
+		features  = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]);
+		if (classes & BIT(VIRTIO_ID_NET))
+			print_features(vdpa, features, true, VIRTIO_ID_NET);
+		else
+			print_features(vdpa, features, true, 0);
+	}
+
 	pr_out_handle_end(vdpa);
 }
 
-- 
2.35.1

Re: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Stephen Hemminger]

On Sun, 13 Mar 2022 19:12:17 +0200
Eli Cohen <elic@nvidia.com> wrote:

> +			if (feature_strs)
> +				s = feature_strs[i];
> +			else
> +				s = NULL;

You really don't like trigraphs?
			s = feature_strs ? feature_strs[i] : NULL;
is more compact

RE: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Eli Cohen]

> 
> On Sun, 13 Mar 2022 19:12:17 +0200
> Eli Cohen <elic@nvidia.com> wrote:
> 
> > +			if (feature_strs)
> > +				s = feature_strs[i];
> > +			else
> > +				s = NULL;
> 
> You really don't like trigraphs?
> 			s = feature_strs ? feature_strs[i] : NULL;
> is more compact

If you insist I will send another version.
Let me know.

Re: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[David Ahern]

On 3/13/22 12:04 PM, Eli Cohen wrote:
>>
>> On Sun, 13 Mar 2022 19:12:17 +0200
>> Eli Cohen <elic@nvidia.com> wrote:
>>
>>> +			if (feature_strs)
>>> +				s = feature_strs[i];
>>> +			else
>>> +				s = NULL;
>>
>> You really don't like trigraphs?
>> 			s = feature_strs ? feature_strs[i] : NULL;
>> is more compact
> 
> If you insist I will send another version.
> Let me know.

I'll change it before applying

RE: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Eli Cohen]

> 
> On 3/13/22 12:04 PM, Eli Cohen wrote:
> >>
> >> On Sun, 13 Mar 2022 19:12:17 +0200
> >> Eli Cohen <elic@nvidia.com> wrote:
> >>
> >>> +			if (feature_strs)
> >>> +				s = feature_strs[i];
> >>> +			else
> >>> +				s = NULL;
> >>
> >> You really don't like trigraphs?
> >> 			s = feature_strs ? feature_strs[i] : NULL;
> >> is more compact
> >
> > If you insist I will send another version.
> > Let me know.
> 
> I'll change it before applying

Cool, thanks.

Re: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[David Ahern]

On 3/13/22 11:12 AM, Eli Cohen wrote:
> @@ -385,6 +388,97 @@ static const char *parse_class(int num)
>  	return class ? class : "< unknown class >";
>  }
>  
> +static const char * const net_feature_strs[64] = {
> +	[VIRTIO_NET_F_CSUM] = "CSUM",
> +	[VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
> +	[VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
> +	[VIRTIO_NET_F_MTU] = "MTU",
> +	[VIRTIO_NET_F_MAC] = "MAC",
> +	[VIRTIO_NET_F_GUEST_TSO4] = "GUEST_TSO4",
> +	[VIRTIO_NET_F_GUEST_TSO6] = "GUEST_TSO6",
> +	[VIRTIO_NET_F_GUEST_ECN] = "GUEST_ECN",
> +	[VIRTIO_NET_F_GUEST_UFO] = "GUEST_UFO",
> +	[VIRTIO_NET_F_HOST_TSO4] = "HOST_TSO4",
> +	[VIRTIO_NET_F_HOST_TSO6] = "HOST_TSO6",
> +	[VIRTIO_NET_F_HOST_ECN] = "HOST_ECN",
> +	[VIRTIO_NET_F_HOST_UFO] = "HOST_UFO",
> +	[VIRTIO_NET_F_MRG_RXBUF] = "MRG_RXBUF",
> +	[VIRTIO_NET_F_STATUS] = "STATUS",
> +	[VIRTIO_NET_F_CTRL_VQ] = "CTRL_VQ",
> +	[VIRTIO_NET_F_CTRL_RX] = "CTRL_RX",
> +	[VIRTIO_NET_F_CTRL_VLAN] = "CTRL_VLAN",
> +	[VIRTIO_NET_F_CTRL_RX_EXTRA] = "CTRL_RX_EXTRA",
> +	[VIRTIO_NET_F_GUEST_ANNOUNCE] = "GUEST_ANNOUNCE",
> +	[VIRTIO_NET_F_MQ] = "MQ",
> +	[VIRTIO_F_NOTIFY_ON_EMPTY] = "NOTIFY_ON_EMPTY",
> +	[VIRTIO_NET_F_CTRL_MAC_ADDR] = "CTRL_MAC_ADDR",
> +	[VIRTIO_F_ANY_LAYOUT] = "ANY_LAYOUT",
> +	[VIRTIO_NET_F_RSC_EXT] = "RSC_EXT",
> +	[VIRTIO_NET_F_HASH_REPORT] = "HASH_REPORT",
> +	[VIRTIO_NET_F_RSS] = "RSS",
> +	[VIRTIO_NET_F_STANDBY] = "STANDBY",
> +	[VIRTIO_NET_F_SPEED_DUPLEX] = "SPEED_DUPLEX",

not very easy on the eyes. Please send a followup that column aligns the
strings. e.g.,

@@ -403,9 +403,9 @@ static const char *parse_class(int num)
 }

 static const char * const net_feature_strs[64] = {
-       [VIRTIO_NET_F_CSUM] = "CSUM",
-       [VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
-       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
+       [VIRTIO_NET_F_CSUM]                     = "CSUM",
+       [VIRTIO_NET_F_GUEST_CSUM]               = "GUEST_CSUM",
+       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS]      = "CTRL_GUEST_OFFLOADS",
...


> +};
> +
> +#define VIRTIO_F_IN_ORDER 35
> +#define VIRTIO_F_NOTIFICATION_DATA 38
> +#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
> +			      VIRTIO_TRANSPORT_F_START + 1)
> +
> +static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
> +	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
> +	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
> +	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
> +	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
> +	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
> +	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
> +	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
> +	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
> +	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",

and the entries here should be a macro to handle the
VIRTIO_TRANSPORT_F_START  offset with column aligned strings.

Re: [PATCH v7 3/4] vdpa: Support for configuring max VQ pairs for a device

[David Ahern]

On 3/13/22 11:12 AM, Eli Cohen wrote:
> @@ -290,6 +295,14 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
>  
>  			NEXT_ARG_FWD();
>  			o_found |= VDPA_OPT_VDEV_MTU;
> +		} else if ((matches(*argv, "max_vqp")  == 0) && (o_optional & VDPA_OPT_MAX_VQP)) {
> +			NEXT_ARG_FWD();
> +			err = vdpa_argv_u16(vdpa, argc, argv, &opts->max_vqp);
> +			if (err)
> +				return err;
> +
> +			NEXT_ARG_FWD();
> +			o_found |= VDPA_OPT_MAX_VQP;
>  		} else {
>  			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
>  			return -EINVAL;

new options require an update to the man page. That should have been
included in this set. Please make sure that happens on future sets.

Re: [PATCH v7 0/4] vdpa tool enhancements

[patchwork-bot+netdevbpf]

Hello:

This series was applied to iproute2/iproute2-next.git (main)
by David Ahern <dsahern@kernel.org>:

On Sun, 13 Mar 2022 19:12:15 +0200 you wrote:
> Hi,
> 
> The following four patch series enhances vdpa to show negotiated
> features for a vdpa device, max features for a management device and
> allows to configure max number of virtqueue pairs.
> 
> v6->v7:
> Fix minor checkpatch warning
> 
> [...]

Here is the summary with links:
  - [v7,1/4] vdpa: Remove unsupported command line option
    https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/commit/?id=2d1954c8a54b
  - [v7,2/4] vdpa: Allow for printing negotiated features of a device
    (no matching commit)
  - [v7,3/4] vdpa: Support for configuring max VQ pairs for a device
    https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/commit/?id=16482fd4df11
  - [v7,4/4] vdpa: Support reading device features
    https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/commit/?id=56eb8bf45aa3

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

RE: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Eli Cohen]

> 
> On 3/13/22 11:12 AM, Eli Cohen wrote:
> > @@ -385,6 +388,97 @@ static const char *parse_class(int num)
> >  	return class ? class : "< unknown class >";
> >  }
> >
> > +static const char * const net_feature_strs[64] = {
> > +	[VIRTIO_NET_F_CSUM] = "CSUM",
> > +	[VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
> > +	[VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
> > +	[VIRTIO_NET_F_MTU] = "MTU",
> > +	[VIRTIO_NET_F_MAC] = "MAC",
> > +	[VIRTIO_NET_F_GUEST_TSO4] = "GUEST_TSO4",
> > +	[VIRTIO_NET_F_GUEST_TSO6] = "GUEST_TSO6",
> > +	[VIRTIO_NET_F_GUEST_ECN] = "GUEST_ECN",
> > +	[VIRTIO_NET_F_GUEST_UFO] = "GUEST_UFO",
> > +	[VIRTIO_NET_F_HOST_TSO4] = "HOST_TSO4",
> > +	[VIRTIO_NET_F_HOST_TSO6] = "HOST_TSO6",
> > +	[VIRTIO_NET_F_HOST_ECN] = "HOST_ECN",
> > +	[VIRTIO_NET_F_HOST_UFO] = "HOST_UFO",
> > +	[VIRTIO_NET_F_MRG_RXBUF] = "MRG_RXBUF",
> > +	[VIRTIO_NET_F_STATUS] = "STATUS",
> > +	[VIRTIO_NET_F_CTRL_VQ] = "CTRL_VQ",
> > +	[VIRTIO_NET_F_CTRL_RX] = "CTRL_RX",
> > +	[VIRTIO_NET_F_CTRL_VLAN] = "CTRL_VLAN",
> > +	[VIRTIO_NET_F_CTRL_RX_EXTRA] = "CTRL_RX_EXTRA",
> > +	[VIRTIO_NET_F_GUEST_ANNOUNCE] = "GUEST_ANNOUNCE",
> > +	[VIRTIO_NET_F_MQ] = "MQ",
> > +	[VIRTIO_F_NOTIFY_ON_EMPTY] = "NOTIFY_ON_EMPTY",
> > +	[VIRTIO_NET_F_CTRL_MAC_ADDR] = "CTRL_MAC_ADDR",
> > +	[VIRTIO_F_ANY_LAYOUT] = "ANY_LAYOUT",
> > +	[VIRTIO_NET_F_RSC_EXT] = "RSC_EXT",
> > +	[VIRTIO_NET_F_HASH_REPORT] = "HASH_REPORT",
> > +	[VIRTIO_NET_F_RSS] = "RSS",
> > +	[VIRTIO_NET_F_STANDBY] = "STANDBY",
> > +	[VIRTIO_NET_F_SPEED_DUPLEX] = "SPEED_DUPLEX",
> 
> not very easy on the eyes. Please send a followup that column aligns the
> strings. e.g.,
> 
> @@ -403,9 +403,9 @@ static const char *parse_class(int num)
>  }
> 
>  static const char * const net_feature_strs[64] = {
> -       [VIRTIO_NET_F_CSUM] = "CSUM",
> -       [VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
> -       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
> +       [VIRTIO_NET_F_CSUM]                     = "CSUM",
> +       [VIRTIO_NET_F_GUEST_CSUM]               = "GUEST_CSUM",
> +       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS]      = "CTRL_GUEST_OFFLOADS",
> ...
> 
> 
> > +};
> > +
> > +#define VIRTIO_F_IN_ORDER 35
> > +#define VIRTIO_F_NOTIFICATION_DATA 38
> > +#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
> > +			      VIRTIO_TRANSPORT_F_START + 1)
> > +
> > +static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
> > +	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
> > +	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
> > +	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
> > +	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
> > +	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
> > +	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
> > +	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
> > +	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
> > +	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",
> 
> and the entries here should be a macro to handle the
> VIRTIO_TRANSPORT_F_START  offset with column aligned strings.
> 
Do you mean define a new macro for each line above?
I could align them nicely without new macros while being confined to column 88.

RE: [PATCH v7 3/4] vdpa: Support for configuring max VQ pairs for a device

[Eli Cohen]

> 
> On 3/13/22 11:12 AM, Eli Cohen wrote:
> > @@ -290,6 +295,14 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
> >
> >  			NEXT_ARG_FWD();
> >  			o_found |= VDPA_OPT_VDEV_MTU;
> > +		} else if ((matches(*argv, "max_vqp")  == 0) && (o_optional & VDPA_OPT_MAX_VQP)) {
> > +			NEXT_ARG_FWD();
> > +			err = vdpa_argv_u16(vdpa, argc, argv, &opts->max_vqp);
> > +			if (err)
> > +				return err;
> > +
> > +			NEXT_ARG_FWD();
> > +			o_found |= VDPA_OPT_MAX_VQP;
> >  		} else {
> >  			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
> >  			return -EINVAL;
> 
> new options require an update to the man page. That should have been
> included in this set. Please make sure that happens on future sets.

OK, since you already asked to send a new version, I will include.

RE: [PATCH v7 3/4] vdpa: Support for configuring max VQ pairs for a device

[Eli Cohen]

> 
> new options require an update to the man page. That should have been
> included in this set. Please make sure that happens on future sets.

How would you prefer to update the man page? Within each patch or in a
new patch, last one in the series?

Re: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[David Ahern]

On 3/14/22 9:34 AM, Eli Cohen wrote:
>> @@ -403,9 +403,9 @@ static const char *parse_class(int num)
>>  }
>>
>>  static const char * const net_feature_strs[64] = {
>> -       [VIRTIO_NET_F_CSUM] = "CSUM",
>> -       [VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
>> -       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
>> +       [VIRTIO_NET_F_CSUM]                     = "CSUM",
>> +       [VIRTIO_NET_F_GUEST_CSUM]               = "GUEST_CSUM",
>> +       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS]      = "CTRL_GUEST_OFFLOADS",
>> ...
>>
>>
>>> +};
>>> +
>>> +#define VIRTIO_F_IN_ORDER 35
>>> +#define VIRTIO_F_NOTIFICATION_DATA 38
>>> +#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
>>> +			      VIRTIO_TRANSPORT_F_START + 1)
>>> +
>>> +static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
>>> +	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
>>> +	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
>>> +	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
>>> +	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
>>> +	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
>>> +	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
>>> +	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
>>> +	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
>>> +	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",
>>
>> and the entries here should be a macro to handle the
>> VIRTIO_TRANSPORT_F_START  offset with column aligned strings.
>>
> Do you mean define a new macro for each line above?
> I could align them nicely without new macros while being confined to column 88.
> 

VIRTIO_TRANSPORT_F_START is redundant on each line; a macro can be used
to hide that and simplifies each line.

Re: [PATCH v7 3/4] vdpa: Support for configuring max VQ pairs for a device

[David Ahern]

On 3/14/22 9:45 AM, Eli Cohen wrote:
>>
>> new options require an update to the man page. That should have been
>> included in this set. Please make sure that happens on future sets.
> 
> How would you prefer to update the man page? Within each patch or in a
> new patch, last one in the series?

the other patches have been committed so a single patch for this current
set.

For future changes, 1 patch at the end is fine; key is that
documentation change is with the set.

RE: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[Eli Cohen]

> 
> On 3/13/22 11:12 AM, Eli Cohen wrote:
> > @@ -385,6 +388,97 @@ static const char *parse_class(int num)
> >  	return class ? class : "< unknown class >";
> >  }
> >
> > +static const char * const net_feature_strs[64] = {
> > +	[VIRTIO_NET_F_CSUM] = "CSUM",
> > +	[VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
> > +	[VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
> > +	[VIRTIO_NET_F_MTU] = "MTU",
> > +	[VIRTIO_NET_F_MAC] = "MAC",
> > +	[VIRTIO_NET_F_GUEST_TSO4] = "GUEST_TSO4",
> > +	[VIRTIO_NET_F_GUEST_TSO6] = "GUEST_TSO6",
> > +	[VIRTIO_NET_F_GUEST_ECN] = "GUEST_ECN",
> > +	[VIRTIO_NET_F_GUEST_UFO] = "GUEST_UFO",
> > +	[VIRTIO_NET_F_HOST_TSO4] = "HOST_TSO4",
> > +	[VIRTIO_NET_F_HOST_TSO6] = "HOST_TSO6",
> > +	[VIRTIO_NET_F_HOST_ECN] = "HOST_ECN",
> > +	[VIRTIO_NET_F_HOST_UFO] = "HOST_UFO",
> > +	[VIRTIO_NET_F_MRG_RXBUF] = "MRG_RXBUF",
> > +	[VIRTIO_NET_F_STATUS] = "STATUS",
> > +	[VIRTIO_NET_F_CTRL_VQ] = "CTRL_VQ",
> > +	[VIRTIO_NET_F_CTRL_RX] = "CTRL_RX",
> > +	[VIRTIO_NET_F_CTRL_VLAN] = "CTRL_VLAN",
> > +	[VIRTIO_NET_F_CTRL_RX_EXTRA] = "CTRL_RX_EXTRA",
> > +	[VIRTIO_NET_F_GUEST_ANNOUNCE] = "GUEST_ANNOUNCE",
> > +	[VIRTIO_NET_F_MQ] = "MQ",
> > +	[VIRTIO_F_NOTIFY_ON_EMPTY] = "NOTIFY_ON_EMPTY",
> > +	[VIRTIO_NET_F_CTRL_MAC_ADDR] = "CTRL_MAC_ADDR",
> > +	[VIRTIO_F_ANY_LAYOUT] = "ANY_LAYOUT",
> > +	[VIRTIO_NET_F_RSC_EXT] = "RSC_EXT",
> > +	[VIRTIO_NET_F_HASH_REPORT] = "HASH_REPORT",
> > +	[VIRTIO_NET_F_RSS] = "RSS",
> > +	[VIRTIO_NET_F_STANDBY] = "STANDBY",
> > +	[VIRTIO_NET_F_SPEED_DUPLEX] = "SPEED_DUPLEX",
> 
> not very easy on the eyes. Please send a followup that column aligns the
> strings. e.g.,
> 
> @@ -403,9 +403,9 @@ static const char *parse_class(int num)
>  }
> 
>  static const char * const net_feature_strs[64] = {
> -       [VIRTIO_NET_F_CSUM] = "CSUM",
> -       [VIRTIO_NET_F_GUEST_CSUM] = "GUEST_CSUM",
> -       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "CTRL_GUEST_OFFLOADS",
> +       [VIRTIO_NET_F_CSUM]                     = "CSUM",
> +       [VIRTIO_NET_F_GUEST_CSUM]               = "GUEST_CSUM",
> +       [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS]      = "CTRL_GUEST_OFFLOADS",
> ...
> 
> 
> > +};
> > +
> > +#define VIRTIO_F_IN_ORDER 35
> > +#define VIRTIO_F_NOTIFICATION_DATA 38
> > +#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
> > +			      VIRTIO_TRANSPORT_F_START + 1)
> > +
> > +static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
> > +	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
> > +	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
> > +	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
> > +	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
> > +	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
> > +	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
> > +	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
> > +	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
> > +	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",
> 
> and the entries here should be a macro to handle the
> VIRTIO_TRANSPORT_F_START  offset with column aligned strings.
>

I guess I could define a macro here if all the flags would start with "VIRTIO_F_ =" but unfortunately,
the first two flags don't follow this pattern.
I could send kernel patches to replace VIRTIO_RING_F_INDIRECT_DESC and
VIRTIO_RING_F_EVENT_IDX to VIRTIO_F_RING_INDIRECT_DESC and VIRTIO_F_RING_EVENT_IDX
and then fix the format here.

If you meant something else, please be more specific.

Re: [PATCH v7 2/4] vdpa: Allow for printing negotiated features of a device

[David Ahern]

On 3/15/22 5:35 AM, Eli Cohen wrote:
>>> +};
>>> +
>>> +#define VIRTIO_F_IN_ORDER 35
>>> +#define VIRTIO_F_NOTIFICATION_DATA 38
>>> +#define VDPA_EXT_FEATURES_SZ (VIRTIO_TRANSPORT_F_END - \
>>> +			      VIRTIO_TRANSPORT_F_START + 1)
>>> +
>>> +static const char * const ext_feature_strs[VDPA_EXT_FEATURES_SZ] = {
>>> +	[VIRTIO_RING_F_INDIRECT_DESC - VIRTIO_TRANSPORT_F_START] = "RING_INDIRECT_DESC",
>>> +	[VIRTIO_RING_F_EVENT_IDX - VIRTIO_TRANSPORT_F_START] = "RING_EVENT_IDX",
>>> +	[VIRTIO_F_VERSION_1 - VIRTIO_TRANSPORT_F_START] = "VERSION_1",
>>> +	[VIRTIO_F_ACCESS_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ACCESS_PLATFORM",
>>> +	[VIRTIO_F_RING_PACKED - VIRTIO_TRANSPORT_F_START] = "RING_PACKED",
>>> +	[VIRTIO_F_IN_ORDER - VIRTIO_TRANSPORT_F_START] = "IN_ORDER",
>>> +	[VIRTIO_F_ORDER_PLATFORM - VIRTIO_TRANSPORT_F_START] = "ORDER_PLATFORM",
>>> +	[VIRTIO_F_SR_IOV - VIRTIO_TRANSPORT_F_START] = "SR_IOV",
>>> +	[VIRTIO_F_NOTIFICATION_DATA - VIRTIO_TRANSPORT_F_START] = "NOTIFICATION_DATA",
>>
>> and the entries here should be a macro to handle the
>> VIRTIO_TRANSPORT_F_START  offset with column aligned strings.
>>
> 
> I guess I could define a macro here if all the flags would start with "VIRTIO_F_ =" but unfortunately,
> the first two flags don't follow this pattern.
> I could send kernel patches to replace VIRTIO_RING_F_INDIRECT_DESC and
> VIRTIO_RING_F_EVENT_IDX to VIRTIO_F_RING_INDIRECT_DESC and VIRTIO_F_RING_EVENT_IDX
> and then fix the format here.
> 
> If you meant something else, please be more specific.

It can still work with the existing naming - it's the redundant use of
VIRTIO_TRANSPORT_F_START as an offset that is hidden by the macro
allowing the feature to string conversion to be easier to read.