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Date: Tue, 5 Oct 2021 22:45:36 +0530
From: Subbaraya Sundeep <sbhatta@...vell.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>
CC: <sgoutham@...vell.com>, <hkelam@...vell.com>, <gakula@...vell.com>,
Subbaraya Sundeep <sbhatta@...vell.com>
Subject: [net-next PATCH 3/3] octeontx2-pf: Add devlink param to vary rbuf size
The size of receive buffers for receiving packets
is calculated based on the mtu of interface. This
patch adds devlink parameter to utilize user given
size for receive buffers instead. By changing CQE
descriptor size and receive buffer sizes the number
of buffer pointers used by hardware for a large packet
can be configured.
Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
.../ethernet/marvell/octeontx2/nic/otx2_common.h | 1 +
.../ethernet/marvell/octeontx2/nic/otx2_devlink.c | 60 ++++++++++++++++++++++
.../net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 7 +++
.../net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 5 ++
4 files changed, 73 insertions(+)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index 6e0d1ac..f885abe 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -178,6 +178,7 @@ struct otx2_hw {
u16 rqpool_cnt;
u16 sqpool_cnt;
u16 xqe_size;
+ u16 rbuf_fixed_size;
/* NPA */
u32 stack_pg_ptrs; /* No of ptrs per stack page */
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 98450e1..0fc7e32 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -64,6 +64,60 @@ static int otx2_dl_mcam_count_get(struct devlink *devlink, u32 id,
return 0;
}
+static int otx2_dl_rbuf_size_validate(struct devlink *devlink, u32 id,
+ union devlink_param_value val,
+ struct netlink_ext_ack *extack)
+{
+ /* Hardware supports max size of 32k for a receive buffer
+ * and 1536 is typical ethernet frame size.
+ */
+ if (val.vu16 < 1536 || val.vu16 > 32768) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Receive buffer range is 1536 - 32768");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int otx2_dl_rbuf_size_set(struct devlink *devlink, u32 id,
+ struct devlink_param_gset_ctx *ctx)
+{
+ struct otx2_devlink *otx2_dl = devlink_priv(devlink);
+ struct otx2_nic *pfvf = otx2_dl->pfvf;
+ struct net_device *netdev;
+ int err = 0;
+ bool if_up;
+
+ rtnl_lock();
+
+ netdev = pfvf->netdev;
+ if_up = netif_running(netdev);
+ if (if_up)
+ netdev->netdev_ops->ndo_stop(netdev);
+
+ pfvf->hw.rbuf_fixed_size = ALIGN(ctx->val.vu16, OTX2_ALIGN) +
+ OTX2_HEAD_ROOM;
+
+ if (if_up)
+ err = netdev->netdev_ops->ndo_open(netdev);
+
+ rtnl_unlock();
+
+ return err;
+}
+
+static int otx2_dl_rbuf_size_get(struct devlink *devlink, u32 id,
+ struct devlink_param_gset_ctx *ctx)
+{
+ struct otx2_devlink *otx2_dl = devlink_priv(devlink);
+ struct otx2_nic *pfvf = otx2_dl->pfvf;
+
+ ctx->val.vu16 = pfvf->hw.rbuf_fixed_size;
+
+ return 0;
+}
+
static int otx2_dl_cqe_size_validate(struct devlink *devlink, u32 id,
union devlink_param_value val,
struct netlink_ext_ack *extack)
@@ -118,6 +172,7 @@ enum otx2_dl_param_id {
OTX2_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
OTX2_DEVLINK_PARAM_ID_MCAM_COUNT,
OTX2_DEVLINK_PARAM_ID_CQE_SIZE,
+ OTX2_DEVLINK_PARAM_ID_RBUF_SIZE,
};
static const struct devlink_param otx2_dl_params[] = {
@@ -131,6 +186,11 @@ static const struct devlink_param otx2_dl_params[] = {
BIT(DEVLINK_PARAM_CMODE_RUNTIME),
otx2_dl_cqe_size_get, otx2_dl_cqe_size_set,
otx2_dl_cqe_size_validate),
+ DEVLINK_PARAM_DRIVER(OTX2_DEVLINK_PARAM_ID_RBUF_SIZE,
+ "receive_buffer_size", DEVLINK_PARAM_TYPE_U16,
+ BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+ otx2_dl_rbuf_size_get, otx2_dl_rbuf_size_set,
+ otx2_dl_rbuf_size_validate),
};
/* Devlink OPs */
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index 8618cf7..1be524d3 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -65,6 +65,10 @@ static int otx2_change_mtu(struct net_device *netdev, int new_mtu)
netdev_info(netdev, "Changing MTU from %d to %d\n",
netdev->mtu, new_mtu);
netdev->mtu = new_mtu;
+ /* Modify receive buffer size based on MTU and do not
+ * use the fixed size set.
+ */
+ pf->hw.rbuf_fixed_size = 0;
if (if_up)
err = otx2_open(netdev);
@@ -1306,6 +1310,9 @@ static int otx2_get_rbuf_size(struct otx2_nic *pf, int mtu)
int total_size;
int rbuf_size;
+ if (pf->hw.rbuf_fixed_size)
+ return pf->hw.rbuf_fixed_size;
+
/* The data transferred by NIX to memory consists of actual packet
* plus additional data which has timestamp and/or EDSA/HIGIG2
* headers if interface is configured in corresponding modes.
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index 672be05..229d051 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -439,6 +439,7 @@ static void otx2vf_do_set_rx_mode(struct work_struct *work)
static int otx2vf_change_mtu(struct net_device *netdev, int new_mtu)
{
+ struct otx2_nic *vf = netdev_priv(netdev);
bool if_up = netif_running(netdev);
int err = 0;
@@ -448,6 +449,10 @@ static int otx2vf_change_mtu(struct net_device *netdev, int new_mtu)
netdev_info(netdev, "Changing MTU from %d to %d\n",
netdev->mtu, new_mtu);
netdev->mtu = new_mtu;
+ /* Modify receive buffer size based on MTU and do not
+ * use the fixed size set.
+ */
+ vf->hw.rbuf_fixed_size = 0;
if (if_up)
err = otx2vf_open(netdev);
--
2.7.4
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