Re: [PATCH net-next] net: mana: Implement get_ringparam/set_ringparam for mana

From: Shradha Gupta
Date: Tue Jul 16 2024 - 01:49:55 EST

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On Mon, Jul 15, 2024 at 06:42:16AM +0200, Zhu Yanjun wrote:
> ??? 2024/7/15 5:40, Shradha Gupta ??????:
> >Currently the values of WQs for RX and TX queues for MANA devices
> >are hardcoded to default sizes.
> >Allow configuring these values for MANA devices as ringparam
> >configuration(get/set) through ethtool_ops.
> >
> >Signed-off-by: Shradha Gupta <shradhagupta@xxxxxxxxxxxxxxxxxxx>
> >Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> >Reviewed-by: Long Li <longli@xxxxxxxxxxxxx>
> >---
> > drivers/net/ethernet/microsoft/mana/mana_en.c | 20 +++--
> > .../ethernet/microsoft/mana/mana_ethtool.c | 79 +++++++++++++++++++
> > include/net/mana/mana.h | 21 ++++-
> > 3 files changed, 109 insertions(+), 11 deletions(-)
> >
> >diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> >index 91f10910ea44..31355a95e891 100644
> >--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> >+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> >@@ -618,7 +618,7 @@ static int mana_pre_alloc_rxbufs(struct mana_port_context *mpc, int new_mtu)
> > dev = mpc->ac->gdma_dev->gdma_context->dev;
> >- num_rxb = mpc->num_queues * RX_BUFFERS_PER_QUEUE;
> >+ num_rxb = mpc->num_queues * mpc->rx_queue_size;
> > WARN(mpc->rxbufs_pre, "mana rxbufs_pre exists\n");
> > mpc->rxbufs_pre = kmalloc_array(num_rxb, sizeof(void *), GFP_KERNEL);
> >@@ -1899,14 +1899,15 @@ static int mana_create_txq(struct mana_port_context *apc,
> > return -ENOMEM;
> > /* The minimum size of the WQE is 32 bytes, hence
> >- * MAX_SEND_BUFFERS_PER_QUEUE represents the maximum number of WQEs
> >+ * apc->tx_queue_size represents the maximum number of WQEs
> > * the SQ can store. This value is then used to size other queues
> > * to prevent overflow.
> >+ * Also note that the txq_size is always going to be MANA_PAGE_ALIGNED,
> >+ * as tx_queue_size is always a power of 2.
> > */
> >- txq_size = MAX_SEND_BUFFERS_PER_QUEUE * 32;
> >- BUILD_BUG_ON(!MANA_PAGE_ALIGNED(txq_size));
> >+ txq_size = apc->tx_queue_size * 32;
> >- cq_size = MAX_SEND_BUFFERS_PER_QUEUE * COMP_ENTRY_SIZE;
> >+ cq_size = apc->tx_queue_size * COMP_ENTRY_SIZE;
> > cq_size = MANA_PAGE_ALIGN(cq_size);
> > gc = gd->gdma_context;
> >@@ -2145,10 +2146,11 @@ static int mana_push_wqe(struct mana_rxq *rxq)
> > static int mana_create_page_pool(struct mana_rxq *rxq, struct gdma_context *gc)
> > {
> >+ struct mana_port_context *mpc = netdev_priv(rxq->ndev);
> > struct page_pool_params pprm = {};
> > int ret;
> >- pprm.pool_size = RX_BUFFERS_PER_QUEUE;
> >+ pprm.pool_size = mpc->rx_queue_size;
> > pprm.nid = gc->numa_node;
> > pprm.napi = &rxq->rx_cq.napi;
> > pprm.netdev = rxq->ndev;
> >@@ -2180,13 +2182,13 @@ static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc,
> > gc = gd->gdma_context;
> >- rxq = kzalloc(struct_size(rxq, rx_oobs, RX_BUFFERS_PER_QUEUE),
> >+ rxq = kzalloc(struct_size(rxq, rx_oobs, apc->rx_queue_size),
> > GFP_KERNEL);
> > if (!rxq)
> > return NULL;
> > rxq->ndev = ndev;
> >- rxq->num_rx_buf = RX_BUFFERS_PER_QUEUE;
> >+ rxq->num_rx_buf = apc->rx_queue_size;
> > rxq->rxq_idx = rxq_idx;
> > rxq->rxobj = INVALID_MANA_HANDLE;
> >@@ -2734,6 +2736,8 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
> > apc->ndev = ndev;
> > apc->max_queues = gc->max_num_queues;
> > apc->num_queues = gc->max_num_queues;
> >+ apc->tx_queue_size = DEF_TX_BUFFERS_PER_QUEUE;
> >+ apc->rx_queue_size = DEF_RX_BUFFERS_PER_QUEUE;
> > apc->port_handle = INVALID_MANA_HANDLE;
> > apc->pf_filter_handle = INVALID_MANA_HANDLE;
> > apc->port_idx = port_idx;
> >diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> >index 146d5db1792f..7a4752dda7b8 100644
> >--- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> >+++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> >@@ -369,6 +369,83 @@ static int mana_set_channels(struct net_device *ndev,
> > return err;
> > }
> >+static void mana_get_ringparam(struct net_device *ndev,
> >+ struct ethtool_ringparam *ring,
> >+ struct kernel_ethtool_ringparam *kernel_ring,
> >+ struct netlink_ext_ack *extack)
> >+{
> >+ struct mana_port_context *apc = netdev_priv(ndev);
> >+
> >+ ring->rx_pending = apc->rx_queue_size;
> >+ ring->tx_pending = apc->tx_queue_size;
> >+ ring->rx_max_pending = MAX_RX_BUFFERS_PER_QUEUE;
> >+ ring->tx_max_pending = MAX_TX_BUFFERS_PER_QUEUE;
> >+}
> >+
> >+static int mana_set_ringparam(struct net_device *ndev,
> >+ struct ethtool_ringparam *ring,
> >+ struct kernel_ethtool_ringparam *kernel_ring,
> >+ struct netlink_ext_ack *extack)
> >+{
> >+ struct mana_port_context *apc = netdev_priv(ndev);
> >+ u32 new_tx, new_rx;
> >+ u32 old_tx, old_rx;
> >+ int err1, err2;
> >+
> >+ if (ring->rx_jumbo_pending) {
> >+ netdev_err(ndev, "%s: rx_jumbo_pending not supported\n", __func__);
>
> I noticed that "rx_jumbo_pending not supported".
>
> #define ENOTSUP 134 /* Not supported */
>
> So can we use the error -ENOTSUP?
>
> >+ return -EINVAL;
> >+ }
> >+ if (ring->rx_mini_pending) {
> >+ netdev_err(ndev, "%s: rx_mini_pending not supported\n", __func__);
>
> ditto. " rx_mini_pending not supported"
>
> Thanks,
> Zhu Yanjun

Thanks for the pointers Zhu Yanjun, I'll take care of these in the next version.
>
> >+ return -EINVAL;
> >+ }
> >+
> >+ if (!apc)
> >+ return -EINVAL;
> >+
> >+ old_tx = apc->tx_queue_size;
> >+ old_rx = apc->rx_queue_size;
> >+ new_tx = clamp_t(u32, ring->tx_pending, MIN_TX_BUFFERS_PER_QUEUE, MAX_TX_BUFFERS_PER_QUEUE);
> >+ new_rx = clamp_t(u32, ring->rx_pending, MIN_RX_BUFFERS_PER_QUEUE, MAX_RX_BUFFERS_PER_QUEUE);
> >+
> >+ if (new_tx == old_tx && new_rx == old_rx)
> >+ return 0;
> >+
> >+ if (!is_power_of_2(new_tx)) {
> >+ netdev_err(ndev, "%s:Tx:%d not supported\n", __func__, new_tx);
> >+ return -EINVAL;
> >+ }
> >+
> >+ if (!is_power_of_2(new_rx)) {
> >+ netdev_err(ndev, "%s:Rx:%d not supported\n", __func__, new_rx);
> >+ return -EINVAL;
> >+ }
> >+
> >+ err1 = mana_detach(ndev, false);
> >+ if (err1) {
> >+ netdev_err(ndev, "mana_detach failed: %d\n", err1);
> >+ return err1;
> >+ }
> >+
> >+ apc->tx_queue_size = new_tx;
> >+ apc->rx_queue_size = new_rx;
> >+ err1 = mana_attach(ndev);
> >+ if (!err1)
> >+ return 0;
> >+
> >+ netdev_err(ndev, "mana_attach failed: %d\n", err1);
> >+
> >+ /* Try rolling back to the older values */
> >+ apc->tx_queue_size = old_tx;
> >+ apc->rx_queue_size = old_rx;
> >+ err2 = mana_attach(ndev);
> >+ if (err2)
> >+ netdev_err(ndev, "mana_reattach failed: %d\n", err2);
> >+
> >+ return err1;
> >+}
> >+
> > const struct ethtool_ops mana_ethtool_ops = {
> > .get_ethtool_stats = mana_get_ethtool_stats,
> > .get_sset_count = mana_get_sset_count,
> >@@ -380,4 +457,6 @@ const struct ethtool_ops mana_ethtool_ops = {
> > .set_rxfh = mana_set_rxfh,
> > .get_channels = mana_get_channels,
> > .set_channels = mana_set_channels,
> >+ .get_ringparam = mana_get_ringparam,
> >+ .set_ringparam = mana_set_ringparam,
> > };
> >diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
> >index e39b8676fe54..3e27ca5155aa 100644
> >--- a/include/net/mana/mana.h
> >+++ b/include/net/mana/mana.h
> >@@ -38,9 +38,21 @@ enum TRI_STATE {
> > #define COMP_ENTRY_SIZE 64
> >-#define RX_BUFFERS_PER_QUEUE 512
> >+/* This Max value for RX buffers is derived from __alloc_page()'s max page
> >+ * allocation calculation. It allows maximum 2^(MAX_ORDER -1) pages. RX buffer
> >+ * size beyond this value gets rejected by __alloc_page() call.
> >+ */
> >+#define MAX_RX_BUFFERS_PER_QUEUE 8192
> >+#define DEF_RX_BUFFERS_PER_QUEUE 512
> >+#define MIN_RX_BUFFERS_PER_QUEUE 128
> >-#define MAX_SEND_BUFFERS_PER_QUEUE 256
> >+/* This max value for TX buffers is dervied as the maximum allocatable
> >+ * pages supported on host per guest through testing. TX buffer size beyond
> >+ * this value is rejected by the hardware.
> >+ */
> >+#define MAX_TX_BUFFERS_PER_QUEUE 16384
> >+#define DEF_TX_BUFFERS_PER_QUEUE 256
> >+#define MIN_TX_BUFFERS_PER_QUEUE 128
> > #define EQ_SIZE (8 * MANA_PAGE_SIZE)
> >@@ -285,7 +297,7 @@ struct mana_recv_buf_oob {
> > void *buf_va;
> > bool from_pool; /* allocated from a page pool */
> >- /* SGL of the buffer going to be sent has part of the work request. */
> >+ /* SGL of the buffer going to be sent as part of the work request. */
> > u32 num_sge;
> > struct gdma_sge sgl[MAX_RX_WQE_SGL_ENTRIES];
> >@@ -437,6 +449,9 @@ struct mana_port_context {
> > unsigned int max_queues;
> > unsigned int num_queues;
> >+ unsigned int rx_queue_size;
> >+ unsigned int tx_queue_size;
> >+
> > mana_handle_t port_handle;
> > mana_handle_t pf_filter_handle;

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