@@ -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 */
@@ -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 */
@@ -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.
@@ -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);