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Date: Wed, 16 Feb 2022 13:42:47 -0800
From: Si-Wei Liu <si-wei.liu@...cle.com>
To: Eli Cohen <elic@...dia.com>
Cc: stephen@...workplumber.org, netdev@...r.kernel.org,
jasowang@...hat.com, lulu@...hat.com
Subject: Re: [PATCH v1 2/4] vdpa: Allow for printing negotiated features of a
device
On 2/15/2022 7:16 AM, Eli Cohen wrote:
> On Fri, Feb 11, 2022 at 05:15:51PM -0800, Si-Wei Liu wrote:
>>
>> On 2/10/2022 5:31 AM, Eli Cohen wrote:
>>> 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.
>>> $ 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
>>>
>>> 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":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"]}}}
>>>
>>> 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": 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" ]
>>> }
>>> }
>>> }
>>>
>>> Signed-off-by: Eli Cohen <elic@...dia.com>
>>> ---
>>> vdpa/include/uapi/linux/vdpa.h | 2 +
>>> vdpa/vdpa.c | 126 +++++++++++++++++++++++++++++++--
>>> 2 files changed, 124 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
>>> index b7eab069988a..748c350450b2 100644
>>> --- a/vdpa/include/uapi/linux/vdpa.h
>>> +++ b/vdpa/include/uapi/linux/vdpa.h
>>> @@ -40,6 +40,8 @@ enum vdpa_attr {
>>> VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
>>> VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
>>> + VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
>>> +
>>> /* new attributes must be added above here */
>>> VDPA_ATTR_MAX,
>>> };
>>> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
>>> index 4ccb564872a0..7deab710913d 100644
>>> --- a/vdpa/vdpa.c
>>> +++ b/vdpa/vdpa.c
>>> @@ -10,6 +10,7 @@
>>> #include <linux/virtio_net.h>
>>> #include <linux/netlink.h>
>>> #include <libmnl/libmnl.h>
>>> +#include <linux/virtio_ring.h>
>>> #include "mnl_utils.h"
>>> #include <rt_names.h>
>>> @@ -78,6 +79,7 @@ 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)
>>> @@ -385,17 +387,120 @@ 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 void print_net_features(struct vdpa *vdpa, uint64_t features, bool maxf)
>>> +{
>>> + const char *s;
>>> + int i;
>>> +
>>> + if (maxf)
>> This could use a better name. mgmtdevf maybe?
> Will change.
>
>>> + pr_out_array_start(vdpa, "dev_features");
>>> + else
>>> + pr_out_array_start(vdpa, "negotiated_features");
>>> +
>>> + for (i = 0; i < 64; i++) {
>>> + if (!(features & (1ULL << i)))
>>> + continue;
>>> +
>>> + if (i >= VIRTIO_TRANSPORT_F_START && i <= VIRTIO_TRANSPORT_F_END)
>>> + s = ext_feature_strs[i - VIRTIO_TRANSPORT_F_START];
>>> + else
>>> + s = net_feature_strs[i];
>>> +
>>> + if (!s)
>>> + print_uint(PRINT_ANY, NULL, " unrecognized_bit_%d", i);
>>> + else
>>> + print_string(PRINT_ANY, NULL, " %s", s);
>>> + }
>>> + pr_out_array_end(vdpa);
>>> +}
>>> +
>>> +static void print_generic_features(struct vdpa *vdpa, uint64_t features, bool maxf)
>>> +{
>>> + const char *s;
>>> + int i;
>>> +
>>> + if (maxf)
>>> + pr_out_array_start(vdpa, "dev_features");
>>> + else
>>> + pr_out_array_start(vdpa, "negotiated_features");
>>> +
>>> + for (i = 0; i < 64; i++) {
>>> + if (!(features & (1ULL << i)))
>>> + continue;
>>> +
>>> + if (i >= VIRTIO_TRANSPORT_F_START && i <= VIRTIO_TRANSPORT_F_END)
>>> + s = ext_feature_strs[i - VIRTIO_TRANSPORT_F_START];
>>> + else
>>> + s = NULL;
>>> +
>>> + if (!s)
>>> + print_uint(PRINT_ANY, NULL, " bit_%d", i);
>>> + else
>>> + print_string(PRINT_ANY, NULL, " %s", s);
>>> + }
>>> + pr_out_array_end(vdpa);
>>> +}
>>> +
>> It looks like most of the implantation in the above two functions are the
>> same and the rest are similar. I wonder if can consolidate into one by
>> adding a virtio type (dev_id) argument? You may create another global static
>> array that helps mapping VIRTIO_ID_NET to net_feature_strs?
>>
> So maybe just create multidimensional array of to find the string for a
> device_id/bit number combination and simplify the code above. And for
> now just populate it for net devices. For undefined just print "bit_n".
Yeah, that sounds fine, too.
Thanks,
-Siwei
>
>>> 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");
>> This looks like a minor adjustment to the existing code? Not sure if worth
>> another patch though.
> I will remove it from this patch.
>>> for (i = 1; i < 64; i++) {
>>> @@ -579,9 +684,10 @@ 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 +716,18 @@ 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]);
>>> + if (tb[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] && dev_id == VIRTIO_ID_NET)
>>> + print_net_features(vdpa, val_u64, false);
>>> + else
>>> + print_generic_features(vdpa, val_u64, true);
>> Why the last arg is true? That would output the dev_features line instead.
>>
> Will fix.
>
>> -Siwei
>>
>>> + }
>>> }
>>> static void pr_out_dev_config(struct vdpa *vdpa, struct nlattr **tb)
>>> @@ -619,7 +737,7 @@ 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;
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