[SRU][P/N:linux-azure][PATCH 2/2] hv_netvsc: Use VF's tso_max_size value when data path is VF

[John Cabaj]

From: Shradha Gupta <shradhagupta at linux.microsoft.com>

BugLink: https://bugs.launchpad.net/bugs/2119958

On Azure, increasing VF's gso/gro packet size to up-to GSO_MAX_SIZE
is not possible without allowing the same for netvsc NIC
(as the NICs are bonded together). For bonded NICs, the min of the max
aggregated pkt size of the members is propagated in the stack.

Therefore, we use netif_set_tso_max_size() to set max aggregated pkt size
to VF's packet size for netvsc too, when the data path is switched over
to the VF
Tested on azure env with Accelerated Networking enabled and disabled.

Signed-off-by: Shradha Gupta <shradhagupta at linux.microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 685920920e3d5f68a8c50107b97747b0f8ce050f)
Signed-off-by: John Cabaj <john.cabaj at canonical.com>
---
 drivers/net/hyperv/hyperv_net.h   |  2 ++
 drivers/net/hyperv/netvsc_drv.c   | 15 +++++++++++++++
 drivers/net/hyperv/rndis_filter.c | 13 +++++++------
 3 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 3065f25777bb..cb6f5482d203 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -1177,6 +1177,8 @@ struct netvsc_device {
 	u32 max_chn;
 	u32 num_chn;
 
+	u32 netvsc_gso_max_size;
+
 	atomic_t open_chn;
 	struct work_struct subchan_work;
 	wait_queue_head_t subchan_open;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index d9ddbf087845..7e9dd29da197 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2427,6 +2427,21 @@ static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event)
 	} else {
 		netdev_info(ndev, "Data path switched %s VF: %s\n",
 			    vf_is_up ? "to" : "from", vf_netdev->name);
+
+		/* In Azure, when accelerated networking in enabled, other NICs
+		 * like MANA, MLX, are configured as a bonded nic with
+		 * Netvsc(failover) NIC. For bonded NICs, the min of the max
+		 * pkt aggregate size of the members is propagated in the stack.
+		 * In order to allow these NICs (MANA/MLX) to use up to
+		 * GSO_MAX_SIZE gso packet size, we need to allow Netvsc NIC to
+		 * also support this in the guest.
+		 * This value is only increased for netvsc NIC when datapath is
+		 * switched over to the VF
+		 */
+		if (vf_is_up)
+			netif_set_tso_max_size(ndev, vf_netdev->tso_max_size);
+		else
+			netif_set_tso_max_size(ndev, netvsc_dev->netvsc_gso_max_size);
 	}
 
 	return NOTIFY_OK;
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 9b8769a8b77a..9e73959e61ee 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1342,9 +1342,10 @@ static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
 	struct net_device_context *net_device_ctx = netdev_priv(net);
 	struct ndis_offload hwcaps;
 	struct ndis_offload_params offloads;
-	unsigned int gso_max_size = GSO_LEGACY_MAX_SIZE;
 	int ret;
 
+	nvdev->netvsc_gso_max_size = GSO_LEGACY_MAX_SIZE;
+
 	/* Find HW offload capabilities */
 	ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
 	if (ret != 0)
@@ -1376,8 +1377,8 @@ static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
 			offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
 			net->hw_features |= NETIF_F_TSO;
 
-			if (hwcaps.lsov2.ip4_maxsz < gso_max_size)
-				gso_max_size = hwcaps.lsov2.ip4_maxsz;
+			if (hwcaps.lsov2.ip4_maxsz < nvdev->netvsc_gso_max_size)
+				nvdev->netvsc_gso_max_size = hwcaps.lsov2.ip4_maxsz;
 		}
 
 		if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
@@ -1397,8 +1398,8 @@ static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
 			offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
 			net->hw_features |= NETIF_F_TSO6;
 
-			if (hwcaps.lsov2.ip6_maxsz < gso_max_size)
-				gso_max_size = hwcaps.lsov2.ip6_maxsz;
+			if (hwcaps.lsov2.ip6_maxsz < nvdev->netvsc_gso_max_size)
+				nvdev->netvsc_gso_max_size = hwcaps.lsov2.ip6_maxsz;
 		}
 
 		if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
@@ -1424,7 +1425,7 @@ static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
 	 */
 	net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
 
-	netif_set_tso_max_size(net, gso_max_size);
+	netif_set_tso_max_size(net, nvdev->netvsc_gso_max_size);
 
 	ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
 
-- 
2.43.0