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Message-Id: <1684922230-24073-1-git-send-email-shradhagupta@linux.microsoft.com>
Date: Wed, 24 May 2023 02:57:10 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org,
linux-hyperv@...r.kernel.org,
netdev@...r.kernel.org
Cc: Shradha Gupta <shradhagupta@...ux.microsoft.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>,
Dexuan Cui <decui@...rosoft.com>,
Long Li <longli@...rosoft.com>,
Michael Kelley <mikelley@...rosoft.com>,
"David S. Miller" <davem@...emloft.net>,
Steen Hegelund <steen.hegelund@...rochip.com>,
Simon Horman <simon.horman@...igine.com>
Subject: [PATCH v2] hv_netvsc: Allocate rx indirection table size dynamically
Allocate the size of rx indirection table dynamically in netvsc
from the value of size provided by OID_GEN_RECEIVE_SCALE_CAPABILITIES
query instead of using a constant value of ITAB_NUM.
Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
---
Changes in v2:
* Added a missing free for rx_table to fix a leak
* Corrected alignment around rx table size query
* Fixed incorrect error handling for rx_table pointer.
---
drivers/net/hyperv/hyperv_net.h | 5 ++++-
drivers/net/hyperv/netvsc_drv.c | 18 ++++++++++++++----
drivers/net/hyperv/rndis_filter.c | 22 ++++++++++++++++++----
3 files changed, 36 insertions(+), 9 deletions(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index dd5919ec408b..1dbdb65ca8f0 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -74,6 +74,7 @@ struct ndis_recv_scale_cap { /* NDIS_RECEIVE_SCALE_CAPABILITIES */
#define NDIS_RSS_HASH_SECRET_KEY_MAX_SIZE_REVISION_2 40
#define ITAB_NUM 128
+#define ITAB_NUM_MAX 256
struct ndis_recv_scale_param { /* NDIS_RECEIVE_SCALE_PARAMETERS */
struct ndis_obj_header hdr;
@@ -1034,7 +1035,9 @@ struct net_device_context {
u32 tx_table[VRSS_SEND_TAB_SIZE];
- u16 rx_table[ITAB_NUM];
+ u16 *rx_table;
+
+ int rx_table_sz;
/* Ethtool settings */
u8 duplex;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 0103ff914024..ab791e4ca63c 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1040,6 +1040,13 @@ static int netvsc_detach(struct net_device *ndev,
rndis_filter_device_remove(hdev, nvdev);
+ /*
+ * Free the rx indirection table and reset the table size to 0.
+ * With the netvsc_attach call it will get allocated again.
+ */
+ ndev_ctx->rx_table_sz = 0;
+ kfree(ndev_ctx->rx_table);
+
return 0;
}
@@ -1747,7 +1754,9 @@ static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
static u32 netvsc_rss_indir_size(struct net_device *dev)
{
- return ITAB_NUM;
+ struct net_device_context *ndc = netdev_priv(dev);
+
+ return ndc->rx_table_sz;
}
static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
@@ -1766,7 +1775,7 @@ static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
rndis_dev = ndev->extension;
if (indir) {
- for (i = 0; i < ITAB_NUM; i++)
+ for (i = 0; i < ndc->rx_table_sz; i++)
indir[i] = ndc->rx_table[i];
}
@@ -1792,11 +1801,11 @@ static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
rndis_dev = ndev->extension;
if (indir) {
- for (i = 0; i < ITAB_NUM; i++)
+ for (i = 0; i < ndc->rx_table_sz; i++)
if (indir[i] >= ndev->num_chn)
return -EINVAL;
- for (i = 0; i < ITAB_NUM; i++)
+ for (i = 0; i < ndc->rx_table_sz; i++)
ndc->rx_table[i] = indir[i];
}
@@ -2638,6 +2647,7 @@ static void netvsc_remove(struct hv_device *dev)
hv_set_drvdata(dev, NULL);
+ kfree(ndev_ctx->rx_table);
free_percpu(ndev_ctx->vf_stats);
free_netdev(net);
}
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index eea777ec2541..3695c7d3da3a 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -927,7 +927,7 @@ static int rndis_set_rss_param_msg(struct rndis_device *rdev,
struct rndis_set_request *set;
struct rndis_set_complete *set_complete;
u32 extlen = sizeof(struct ndis_recv_scale_param) +
- 4 * ITAB_NUM + NETVSC_HASH_KEYLEN;
+ 4 * ndc->rx_table_sz + NETVSC_HASH_KEYLEN;
struct ndis_recv_scale_param *rssp;
u32 *itab;
u8 *keyp;
@@ -953,7 +953,7 @@ static int rndis_set_rss_param_msg(struct rndis_device *rdev,
rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
NDIS_HASH_TCP_IPV6;
- rssp->indirect_tabsize = 4*ITAB_NUM;
+ rssp->indirect_tabsize = 4 * ndc->rx_table_sz;
rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
rssp->hashkey_size = NETVSC_HASH_KEYLEN;
rssp->hashkey_offset = rssp->indirect_taboffset +
@@ -961,7 +961,7 @@ static int rndis_set_rss_param_msg(struct rndis_device *rdev,
/* Set indirection table entries */
itab = (u32 *)(rssp + 1);
- for (i = 0; i < ITAB_NUM; i++)
+ for (i = 0; i < ndc->rx_table_sz; i++)
itab[i] = ndc->rx_table[i];
/* Set hask key values */
@@ -1548,6 +1548,20 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
if (ret || rsscap.num_recv_que < 2)
goto out;
+ if (rsscap.num_indirect_tabent &&
+ rsscap.num_indirect_tabent <= ITAB_NUM_MAX)
+ ndc->rx_table_sz = rsscap.num_indirect_tabent;
+ else
+ ndc->rx_table_sz = ITAB_NUM;
+
+ ndc->rx_table = kzalloc(sizeof(u16) * ndc->rx_table_sz,
+ GFP_KERNEL);
+ if (!ndc->rx_table) {
+ netdev_err(net, "Error in allocating rx indirection table of size %d\n",
+ ndc->rx_table_sz);
+ goto out;
+ }
+
/* This guarantees that num_possible_rss_qs <= num_online_cpus */
num_possible_rss_qs = min_t(u32, num_online_cpus(),
rsscap.num_recv_que);
@@ -1558,7 +1572,7 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
if (!netif_is_rxfh_configured(net)) {
- for (i = 0; i < ITAB_NUM; i++)
+ for (i = 0; i < ndc->rx_table_sz; i++)
ndc->rx_table[i] = ethtool_rxfh_indir_default(
i, net_device->num_chn);
}
--
2.34.1
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