netdev - [PATCH iproute2] vdpa: Add virtqueue pairs set capacity

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Date:   Thu, 24 Mar 2022 05:19:13 -0400
From:   08005325@....com
To:     netdev@...r.kernel.org
Cc:     parav@...dia.com, stephen@...workplumber.org,
        Michael Qiu <qiudayu@...heros.com>
Subject: [PATCH iproute2] vdpa: Add virtqueue pairs set capacity

From: Michael Qiu <qiudayu@...heros.com>

vdpa framework not only support query the max virtqueue pair, but
also for the set action.

This patch enable this capacity, and it is very useful for VMs
 who needs multiqueue support.

Signed-off-by: Michael Qiu <qiudayu@...heros.com>
---
 vdpa/vdpa.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index f048e47..434d68e 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -23,6 +23,7 @@
 #define VDPA_OPT_VDEV_HANDLE		BIT(3)
 #define VDPA_OPT_VDEV_MAC		BIT(4)
 #define VDPA_OPT_VDEV_MTU		BIT(5)
+#define VDPA_OPT_VDEV_QUEUE_PAIRS	BIT(6)
 
 struct vdpa_opts {
 	uint64_t present; /* flags of present items */
@@ -32,6 +33,7 @@ struct vdpa_opts {
 	unsigned int device_id;
 	char mac[ETH_ALEN];
 	uint16_t mtu;
+	uint16_t max_vq_pairs;
 };
 
 struct vdpa {
@@ -219,6 +221,8 @@ 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_VDEV_QUEUE_PAIRS)
+		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, opts->max_vq_pairs);
 }
 
 static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
@@ -287,6 +291,15 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
 
 			NEXT_ARG_FWD();
 			o_found |= VDPA_OPT_VDEV_MTU;
+		} else if ((strcmp(*argv, "max_vq_pairs") == 0) &&
+			   (o_all & VDPA_OPT_VDEV_QUEUE_PAIRS)) {
+			NEXT_ARG_FWD();
+			err = vdpa_argv_u16(vdpa, argc, argv, &opts->max_vq_pairs);
+			if (err)
+				return err;
+
+			NEXT_ARG_FWD();
+			o_found |= VDPA_OPT_VDEV_QUEUE_PAIRS;
 		} else {
 			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
 			return -EINVAL;
@@ -467,7 +480,7 @@ 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 ] [ mtu MTU ]\n");
+	fprintf(stderr, "       vdpa dev add name NAME mgmtdev MANAGEMENTDEV [ mac MACADDR ] [ mtu MTU ] [ max_vq_pairs N ]\n");
 	fprintf(stderr, "       vdpa dev del DEV\n");
 	fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
 }
@@ -557,7 +570,7 @@ 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_MTU);
+				  VDPA_OPT_VDEV_MAC | VDPA_OPT_VDEV_MTU | VDPA_OPT_VDEV_QUEUE_PAIRS);
 	if (err)
 		return err;
 
-- 
1.8.3.1