[PATCH net-next] net: mana: Allow variable size indirection table

Shradha Gupta
2024-05-23T16:55:18Z

Allow variable size indirection table allocation in MANA instead
of using a constant value MANA_INDIRECT_TABLE_SIZE.
The size is now derived from the MANA_QUERY_VPORT_CONFIG and the
indirection table is allocated dynamically.

Signed-off-by: Shradha Gupta <shradhagupta@linux.microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
drivers/infiniband/hw/mana/qp.c | 11 ++--
drivers/net/ethernet/microsoft/mana/mana_en.c | 66 ++++++++++++++++---
.../ethernet/microsoft/mana/mana_ethtool.c | 20 ++++--
include/net/mana/gdma.h | 4 +-
include/net/mana/mana.h | 10 +--
5 files changed, 84 insertions(+), 27 deletions(-)

diff --git a/drivers/infiniband/hw/mana/qp.c b/drivers/infiniband/hw/mana/qp.c
index 6e7627745c95..5684738d6551 100644
--- a/drivers/infiniband/hw/mana/qp.c
+++ b/drivers/infiniband/hw/mana/qp.c
@@ -22,8 +22,7 @@ static int mana_ib_cfg_vport_steering(struct mana_ib_dev *dev,

gc = mdev_to_gc(dev);

- req_buf_size =
- sizeof(*req) + sizeof(mana_handle_t) * MANA_INDIRECT_TABLE_SIZE;
+ req_buf_size = struct_size(req, indir_tab, MANA_INDIRECT_TABLE_DEF_SIZE);
req = kzalloc(req_buf_size, GFP_KERNEL);
if (!req)
return -ENOMEM;
@@ -43,18 +42,18 @@ static int mana_ib_cfg_vport_steering(struct mana_ib_dev *dev,
if (log_ind_tbl_size)
req->rss_enable = true;

- req->num_indir_entries = MANA_INDIRECT_TABLE_SIZE;
+ req->num_indir_entries = MANA_INDIRECT_TABLE_DEF_SIZE;
req->indir_tab_offset = sizeof(*req);
req->update_indir_tab = true;
req->cqe_coalescing_enable = 1;

req_indir_tab = (mana_handle_t *)(req + 1);
/* The ind table passed to the hardware must have
- * MANA_INDIRECT_TABLE_SIZE entries. Adjust the verb
+ * MANA_INDIRECT_TABLE_DEF_SIZE entries. Adjust the verb
* ind_table to MANA_INDIRECT_TABLE_SIZE if required
*/
ibdev_dbg(&dev->ib_dev, "ind table size %u\n", 1 << log_ind_tbl_size);
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++) {
+ for (i = 0; i < MANA_INDIRECT_TABLE_DEF_SIZE; i++) {
req_indir_tab[i] = ind_table[i % (1 << log_ind_tbl_size)];
ibdev_dbg(&dev->ib_dev, "index %u handle 0x%llx\n", i,
req_indir_tab[i]);
@@ -141,7 +140,7 @@ static int mana_ib_create_qp_rss(struct ib_qp *ibqp, struct ib_pd *pd,
}

ind_tbl_size = 1 << ind_tbl->log_ind_tbl_size;
- if (ind_tbl_size > MANA_INDIRECT_TABLE_SIZE) {
+ if (ind_tbl_size > MANA_INDIRECT_TABLE_DEF_SIZE) {
ibdev_dbg(&mdev->ib_dev,
"Indirect table size %d exceeding limit\n",
ind_tbl_size);
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index d8af5e7e15b4..cd119349e5a0 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -481,7 +481,7 @@ static int mana_get_tx_queue(struct net_device *ndev, struct sk_buff *skb,
struct sock *sk = skb->sk;
int txq;

- txq = apc->indir_table[hash & MANA_INDIRECT_TABLE_MASK];
+ txq = apc->indir_table[hash & (apc->indir_table_sz - 1)];

if (txq != old_q && sk && sk_fullsock(sk) &&
rcu_access_pointer(sk->sk_dst_cache))
@@ -962,7 +962,16 @@ static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,

*max_sq = resp.max_num_sq;
*max_rq = resp.max_num_rq;
- *num_indir_entry = resp.num_indirection_ent;
+ if (resp.num_indirection_ent > 0 &&
+ resp.num_indirection_ent <= MANA_INDIRECT_TABLE_MAX_SIZE &&
+ is_power_of_2(resp.num_indirection_ent)) {
+ *num_indir_entry = resp.num_indirection_ent;
+ } else {
+ netdev_warn(apc->ndev,
+ "Setting indirection table size to default %d for vPort %d\n",
+ MANA_INDIRECT_TABLE_DEF_SIZE, apc->port_idx);
+ *num_indir_entry = MANA_INDIRECT_TABLE_DEF_SIZE;
+ }

apc->port_handle = resp.vport;
ether_addr_copy(apc->mac_addr, resp.mac_addr);
@@ -1054,7 +1063,6 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
bool update_default_rxobj, bool update_key,
bool update_tab)
{
- u16 num_entries = MANA_INDIRECT_TABLE_SIZE;
struct mana_cfg_rx_steer_req_v2 *req;
struct mana_cfg_rx_steer_resp resp = {};
struct net_device *ndev = apc->ndev;
@@ -1062,7 +1070,7 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
u32 req_buf_size;
int err;

- req_buf_size = sizeof(*req) + sizeof(mana_handle_t) * num_entries;
+ req_buf_size = struct_size(req, indir_tab, apc->indir_table_sz);
req = kzalloc(req_buf_size, GFP_KERNEL);
if (!req)
return -ENOMEM;
@@ -1073,7 +1081,7 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
req->hdr.req.msg_version = GDMA_MESSAGE_V2;

req->vport = apc->port_handle;
- req->num_indir_entries = num_entries;
+ req->num_indir_entries = apc->indir_table_sz;
req->indir_tab_offset = sizeof(*req);
req->rx_enable = rx;
req->rss_enable = apc->rss_state;
@@ -1113,7 +1121,7 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
}

netdev_info(ndev, "Configured steering vPort %llu entries %u\n",
- apc->port_handle, num_entries);
+ apc->port_handle, apc->indir_table_sz);
out:
kfree(req);
return err;
@@ -2346,11 +2354,34 @@ static int mana_create_vport(struct mana_port_context *apc,
return mana_create_txq(apc, net);
}

+static int mana_rss_table_alloc(struct mana_port_context *apc)
+{
+ if (!apc->indir_table_sz) {
+ netdev_err(apc->ndev,
+ "Indirection table size not set for vPort %d\n",
+ apc->port_idx);
+ return -EINVAL;
+ }
+
+ apc->indir_table = kcalloc(apc->indir_table_sz, sizeof(u32), GFP_KERNEL);
+ if (!apc->indir_table)
+ return -ENOMEM;
+
+ apc->rxobj_table = kcalloc(apc->indir_table_sz, sizeof(mana_handle_t), GFP_KERNEL);
+
+ if (!apc->rxobj_table) {
+ kfree(apc->indir_table);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
static void mana_rss_table_init(struct mana_port_context *apc)
{
int i;

- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+ for (i = 0; i < apc->indir_table_sz; i++)
apc->indir_table[i] =
ethtool_rxfh_indir_default(i, apc->num_queues);
}
@@ -2363,7 +2394,7 @@ int mana_config_rss(struct mana_port_context *apc, enum TRI_STATE rx,
int i;

if (update_tab) {
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++) {
+ for (i = 0; i < apc->indir_table_sz; i++) {
queue_idx = apc->indir_table[i];
apc->rxobj_table[i] = apc->rxqs[queue_idx]->rxobj;
}
@@ -2468,7 +2499,6 @@ static int mana_init_port(struct net_device *ndev)
struct mana_port_context *apc = netdev_priv(ndev);
u32 max_txq, max_rxq, max_queues;
int port_idx = apc->port_idx;
- u32 num_indirect_entries;
int err;

err = mana_init_port_context(apc);
@@ -2476,7 +2506,7 @@ static int mana_init_port(struct net_device *ndev)
return err;

err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
- &num_indirect_entries);
+ &apc->indir_table_sz);
if (err) {
netdev_err(ndev, "Failed to query info for vPort %d\n",
port_idx);
@@ -2725,6 +2755,10 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
if (err)
goto free_net;

+ err = mana_rss_table_alloc(apc);
+ if (err)
+ goto reset_apc;
+
netdev_lockdep_set_classes(ndev);

ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
@@ -2747,6 +2781,11 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
return 0;

reset_apc:
+ apc->indir_table_sz = 0;
+ kfree(apc->indir_table);
+ apc->indir_table = NULL;
+ kfree(apc->rxobj_table);
+ apc->rxobj_table = NULL;
kfree(apc->rxqs);
apc->rxqs = NULL;
free_net:
@@ -2899,6 +2938,7 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
{
struct gdma_context *gc = gd->gdma_context;
struct mana_context *ac = gd->driver_data;
+ struct mana_port_context *apc;
struct device *dev = gc->dev;
struct net_device *ndev;
int err;
@@ -2910,6 +2950,7 @@ void mana_remove(struct gdma_dev *gd, bool suspending)

for (i = 0; i < ac->num_ports; i++) {
ndev = ac->ports[i];
+ apc = netdev_priv(ndev);
if (!ndev) {
if (i == 0)
dev_err(dev, "No net device to remove\n");
@@ -2933,6 +2974,11 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
}

unregister_netdevice(ndev);
+ apc->indir_table_sz = 0;
+ kfree(apc->indir_table);
+ apc->indir_table = NULL;
+ kfree(apc->rxobj_table);
+ apc->rxobj_table = NULL;

rtnl_unlock();

diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
index ab2413d71f6c..1667f18046d2 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
@@ -245,7 +245,9 @@ static u32 mana_get_rxfh_key_size(struct net_device *ndev)

static u32 mana_rss_indir_size(struct net_device *ndev)
{
- return MANA_INDIRECT_TABLE_SIZE;
+ struct mana_port_context *apc = netdev_priv(ndev);
+
+ return apc->indir_table_sz;
}

static int mana_get_rxfh(struct net_device *ndev,
@@ -257,7 +259,7 @@ static int mana_get_rxfh(struct net_device *ndev,
rxfh->hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */

if (rxfh->indir) {
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+ for (i = 0; i < apc->indir_table_sz; i++)
rxfh->indir[i] = apc->indir_table[i];
}

@@ -273,8 +275,8 @@ static int mana_set_rxfh(struct net_device *ndev,
{
struct mana_port_context *apc = netdev_priv(ndev);
bool update_hash = false, update_table = false;
- u32 save_table[MANA_INDIRECT_TABLE_SIZE];
u8 save_key[MANA_HASH_KEY_SIZE];
+ u32 *save_table;
int i, err;

if (!apc->port_is_up)
@@ -284,13 +286,17 @@ static int mana_set_rxfh(struct net_device *ndev,
rxfh->hfunc != ETH_RSS_HASH_TOP)
return -EOPNOTSUPP;

+ save_table = kcalloc(apc->indir_table_sz, sizeof(u32), GFP_KERNEL);
+ if (!save_table)
+ return -ENOMEM;
+
if (rxfh->indir) {
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+ for (i = 0; i < apc->indir_table_sz; i++)
if (rxfh->indir[i] >= apc->num_queues)
return -EINVAL;

update_table = true;
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++) {
+ for (i = 0; i < apc->indir_table_sz; i++) {
save_table[i] = apc->indir_table[i];
apc->indir_table[i] = rxfh->indir[i];
}
@@ -306,7 +312,7 @@ static int mana_set_rxfh(struct net_device *ndev,

if (err) { /* recover to original values */
if (update_table) {
- for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+ for (i = 0; i < apc->indir_table_sz; i++)
apc->indir_table[i] = save_table[i];
}

@@ -316,6 +322,8 @@ static int mana_set_rxfh(struct net_device *ndev,
mana_config_rss(apc, TRI_STATE_TRUE, update_hash, update_table);
}

+ kfree(save_table);
+
return err;
}

diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 27684135bb4d..3b76d994c3d0 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -543,11 +543,13 @@ enum {
*/
#define GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX BIT(2)
#define GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG BIT(3)
+#define GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT BIT(5)

#define GDMA_DRV_CAP_FLAGS1 \
(GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \
GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX | \
- GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG)
+ GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG |\
+ GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT)

#define GDMA_DRV_CAP_FLAGS2 0

diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 4eeedf14711b..59823901b74f 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -30,8 +30,8 @@ enum TRI_STATE {
};

/* Number of entries for hardware indirection table must be in power of 2 */
-#define MANA_INDIRECT_TABLE_SIZE 64
-#define MANA_INDIRECT_TABLE_MASK (MANA_INDIRECT_TABLE_SIZE - 1)
+#define MANA_INDIRECT_TABLE_MAX_SIZE 512
+#define MANA_INDIRECT_TABLE_DEF_SIZE 64

/* The Toeplitz hash key's length in bytes: should be multiple of 8 */
#define MANA_HASH_KEY_SIZE 40
@@ -410,10 +410,11 @@ struct mana_port_context {
struct mana_tx_qp *tx_qp;

/* Indirection Table for RX & TX. The values are queue indexes */
- u32 indir_table[MANA_INDIRECT_TABLE_SIZE];
+ u32 *indir_table;
+ u32 indir_table_sz;

/* Indirection table containing RxObject Handles */
- mana_handle_t rxobj_table[MANA_INDIRECT_TABLE_SIZE];
+ mana_handle_t *rxobj_table;

/* Hash key used by the NIC */
u8 hashkey[MANA_HASH_KEY_SIZE];
@@ -670,6 +671,7 @@ struct mana_cfg_rx_steer_req_v2 {
u8 hashkey[MANA_HASH_KEY_SIZE];
u8 cqe_coalescing_enable;
u8 reserved2[7];
+ mana_handle_t indir_tab[] __counted_by(num_indir_entries);
}; /* HW DATA */

struct mana_cfg_rx_steer_resp {
--
2.34.1