Re: [PATCH net-next] net: mana: Enable debugfs files for MANA device

[Kalesh Anakkur Purayil]

On Tue, Oct 1, 2024 at 9:10 AM Shradha Gupta
<shradhagupta@xxxxxxxxxxxxxxxxxxx> wrote:
>
> Implement debugfs in MANA driver to be able to view RX,TX,EQ queue
> specific attributes and dump their gdma queues.
> These dumps can be used by other userspace utilities to improve
> debuggability and troubleshooting
>
> Following files are added in debugfs:
>
> /sys/kernel/debug/mana/
> |-------------- 1
>     |--------------- EQs
>     |                 |------- eq0
>     |                 |          |---head
>     |                 |          |---tail
>     |                 |          |---eq_dump
>     |                 |------- eq1
>     |                 .
>     |                 .
>     |
>     |--------------- adapter-MTU
>     |--------------- vport0
>                       |------- RX-0
>                       |          |---cq_budget
>                       |          |---cq_dump
>                       |          |---cq_head
>                       |          |---cq_tail
>                       |          |---rq_head
>                       |          |---rq_nbuf
>                       |          |---rq_tail
>                       |          |---rxq_dump
>                       |------- RX-1
>                       .
>                       .
>                       |------- TX-0
>                       |          |---cq_budget
>                       |          |---cq_dump
>                       |          |---cq_head
>                       |          |---cq_tail
>                       |          |---sq_head
>                       |          |---sq_pend_skb_qlen
>                       |          |---sq_tail
>                       |          |---txq_dump
>                       |------- TX-1
>                       .
>                       .
>
> Signed-off-by: Shradha Gupta <shradhagupta@xxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> ---
>  .../net/ethernet/microsoft/mana/gdma_main.c   |  45 +++++++-
>  drivers/net/ethernet/microsoft/mana/mana_en.c | 105 +++++++++++++++++-
>  include/net/mana/gdma.h                       |   6 +-
>  include/net/mana/mana.h                       |   8 ++
>  4 files changed, 161 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> index ca4ed58f1206..3541bc5e7a48 100644
> --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> @@ -5,9 +5,12 @@
>  #include <linux/pci.h>
>  #include <linux/utsname.h>
>  #include <linux/version.h>
> +#include <linux/debugfs.h>
>
>  #include <net/mana/mana.h>
>
> +struct dentry *mana_debugfs_root;
> +
>  static u32 mana_gd_r32(struct gdma_context *g, u64 offset)
>  {
>         return readl(g->bar0_va + offset);
> @@ -1516,6 +1519,13 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>         gc->bar0_va = bar0_va;
>         gc->dev = &pdev->dev;
>
> +       if (gc->is_pf) {
> +               gc->mana_pci_debugfs = debugfs_create_dir("0", mana_debugfs_root);
> +       } else {
> +               gc->mana_pci_debugfs = debugfs_create_dir(pci_slot_name(pdev->slot),
> +                                                         mana_debugfs_root);
> +       }
[Kalesh] You can remove the braces here.
> +
>         err = mana_gd_setup(pdev);
>         if (err)
>                 goto unmap_bar;
> @@ -1529,6 +1539,13 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  cleanup_gd:
>         mana_gd_cleanup(pdev);
>  unmap_bar:
> +       /*
> +        * at this point we know that the other debugfs child dir/files
> +        * are either not yet created or are already cleaned up.
> +        * The pci debugfs folder clean-up now, will only be cleaning up
> +        * adapter-MTU file and apc->mana_pci_debugfs folder.
> +        */
> +       debugfs_remove_recursive(gc->mana_pci_debugfs);
>         pci_iounmap(pdev, bar0_va);
>  free_gc:
>         pci_set_drvdata(pdev, NULL);
> @@ -1549,6 +1566,8 @@ static void mana_gd_remove(struct pci_dev *pdev)
>
>         mana_gd_cleanup(pdev);
>
> +       debugfs_remove_recursive(gc->mana_pci_debugfs);
> +
>         pci_iounmap(pdev, gc->bar0_va);
>
>         vfree(gc);
> @@ -1600,6 +1619,8 @@ static void mana_gd_shutdown(struct pci_dev *pdev)
>
>         mana_gd_cleanup(pdev);
>
> +       debugfs_remove_recursive(gc->mana_pci_debugfs);
> +
>         pci_disable_device(pdev);
>  }
>
> @@ -1619,7 +1640,29 @@ static struct pci_driver mana_driver = {
>         .shutdown       = mana_gd_shutdown,
>  };
>
> -module_pci_driver(mana_driver);
> +static int __init mana_driver_init(void)
> +{
> +       int err;
> +
> +       mana_debugfs_root = debugfs_create_dir("mana", NULL);
> +
> +       err = pci_register_driver(&mana_driver);
> +
> +       if (err)
> +               debugfs_remove(mana_debugfs_root);
> +
> +       return err;
> +}
> +
> +static void __exit mana_driver_exit(void)
> +{
> +       debugfs_remove(mana_debugfs_root);
> +
> +       pci_unregister_driver(&mana_driver);
> +}
> +
> +module_init(mana_driver_init);
> +module_exit(mana_driver_exit);
>
>  MODULE_DEVICE_TABLE(pci, mana_id_table);
>
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index c47266d1c7c2..255f3189f6fa 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -9,6 +9,7 @@
>  #include <linux/filter.h>
>  #include <linux/mm.h>
>  #include <linux/pci.h>
> +#include <linux/debugfs.h>
>
>  #include <net/checksum.h>
>  #include <net/ip6_checksum.h>
> @@ -30,6 +31,21 @@ static void mana_adev_idx_free(int idx)
>         ida_free(&mana_adev_ida, idx);
>  }
>
> +static ssize_t mana_dbg_q_read(struct file *filp, char __user *buf, size_t count,
> +                              loff_t *pos)
> +{
> +       struct gdma_queue *gdma_q = filp->private_data;
> +
> +       return simple_read_from_buffer(buf, count, pos, gdma_q->queue_mem_ptr,
> +                                      gdma_q->queue_size);
> +}
> +
> +static const struct file_operations mana_dbg_q_fops = {
> +       .owner  = THIS_MODULE,
> +       .open   = simple_open,
> +       .read   = mana_dbg_q_read,
> +};
> +
>  /* Microsoft Azure Network Adapter (MANA) functions */
>
>  static int mana_open(struct net_device *ndev)
> @@ -721,6 +737,13 @@ static const struct net_device_ops mana_devops = {
>
>  static void mana_cleanup_port_context(struct mana_port_context *apc)
>  {
> +       /*
> +        * at this point all dir/files under the vport directory
> +        * are already cleaned up.
> +        * We are sure the apc->mana_port_debugfs remove will not
> +        * cause any freed memory access issues
> +        */
> +       debugfs_remove(apc->mana_port_debugfs);
>         kfree(apc->rxqs);
>         apc->rxqs = NULL;
>  }
> @@ -943,6 +966,8 @@ static int mana_query_device_cfg(struct mana_context *ac, u32 proto_major_ver,
>         else
>                 gc->adapter_mtu = ETH_FRAME_LEN;
>
> +       debugfs_create_u16("adapter-MTU", 0400, gc->mana_pci_debugfs, &gc->adapter_mtu);
> +
>         return 0;
>  }
>
> @@ -1228,6 +1253,8 @@ static void mana_destroy_eq(struct mana_context *ac)
>         if (!ac->eqs)
>                 return;
>
> +       debugfs_remove_recursive(ac->mana_eqs_debugfs);
> +
>         for (i = 0; i < gc->max_num_queues; i++) {
>                 eq = ac->eqs[i].eq;
>                 if (!eq)
> @@ -1240,6 +1267,18 @@ static void mana_destroy_eq(struct mana_context *ac)
>         ac->eqs = NULL;
>  }
>
> +static void mana_create_eq_debugfs(struct mana_context *ac, int i)
> +{
> +       struct mana_eq eq = ac->eqs[i];
> +       char eqnum[32];
> +
> +       sprintf(eqnum, "eq%d", i);
> +       eq.mana_eq_debugfs = debugfs_create_dir(eqnum, ac->mana_eqs_debugfs);
> +       debugfs_create_u32("head", 0400, eq.mana_eq_debugfs, &eq.eq->head);
> +       debugfs_create_u32("tail", 0400, eq.mana_eq_debugfs, &eq.eq->tail);
> +       debugfs_create_file("eq_dump", 0400, eq.mana_eq_debugfs, eq.eq, &mana_dbg_q_fops);
> +}
> +
>  static int mana_create_eq(struct mana_context *ac)
>  {
>         struct gdma_dev *gd = ac->gdma_dev;
> @@ -1260,11 +1299,14 @@ static int mana_create_eq(struct mana_context *ac)
>         spec.eq.context = ac->eqs;
>         spec.eq.log2_throttle_limit = LOG2_EQ_THROTTLE;
>
> +       ac->mana_eqs_debugfs = debugfs_create_dir("EQs", gc->mana_pci_debugfs);
> +
>         for (i = 0; i < gc->max_num_queues; i++) {
>                 spec.eq.msix_index = (i + 1) % gc->num_msix_usable;
>                 err = mana_gd_create_mana_eq(gd, &spec, &ac->eqs[i].eq);
>                 if (err)
>                         goto out;
> +               mana_create_eq_debugfs(ac, i);
>         }
>
>         return 0;
> @@ -1871,6 +1913,8 @@ static void mana_destroy_txq(struct mana_port_context *apc)
>                 return;
>
>         for (i = 0; i < apc->num_queues; i++) {
> +               debugfs_remove_recursive(apc->tx_qp[i].mana_tx_debugfs);
> +
>                 napi = &apc->tx_qp[i].tx_cq.napi;
>                 if (apc->tx_qp[i].txq.napi_initialized) {
>                         napi_synchronize(napi);
> @@ -1889,6 +1933,31 @@ static void mana_destroy_txq(struct mana_port_context *apc)
>         apc->tx_qp = NULL;
>  }
>
> +static void mana_create_txq_debugfs(struct mana_port_context *apc, int idx)
> +{
> +       struct mana_tx_qp *tx_qp = &apc->tx_qp[idx];
> +       char qnum[32];
> +
> +       sprintf(qnum, "TX-%d", idx);
> +       tx_qp->mana_tx_debugfs = debugfs_create_dir(qnum, apc->mana_port_debugfs);
> +       debugfs_create_u32("sq_head", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->txq.gdma_sq->head);
> +       debugfs_create_u32("sq_tail", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->txq.gdma_sq->tail);
> +       debugfs_create_u32("sq_pend_skb_qlen", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->txq.pending_skbs.qlen);
> +       debugfs_create_u32("cq_head", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->tx_cq.gdma_cq->head);
> +       debugfs_create_u32("cq_tail", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->tx_cq.gdma_cq->tail);
> +       debugfs_create_u32("cq_budget", 0400, tx_qp->mana_tx_debugfs,
> +                          &tx_qp->tx_cq.budget);
> +       debugfs_create_file("txq_dump", 0400, tx_qp->mana_tx_debugfs,
> +                           tx_qp->txq.gdma_sq, &mana_dbg_q_fops);
> +       debugfs_create_file("cq_dump", 0400, tx_qp->mana_tx_debugfs,
> +                           tx_qp->tx_cq.gdma_cq, &mana_dbg_q_fops);
> +}
> +
>  static int mana_create_txq(struct mana_port_context *apc,
>                            struct net_device *net)
>  {
> @@ -2000,6 +2069,8 @@ static int mana_create_txq(struct mana_port_context *apc,
>
>                 gc->cq_table[cq->gdma_id] = cq->gdma_cq;
>
> +               mana_create_txq_debugfs(apc, i);
> +
>                 netif_napi_add_tx(net, &cq->napi, mana_poll);
>                 napi_enable(&cq->napi);
>                 txq->napi_initialized = true;
> @@ -2027,6 +2098,8 @@ static void mana_destroy_rxq(struct mana_port_context *apc,
>         if (!rxq)
>                 return;
>
> +       debugfs_remove_recursive(rxq->mana_rx_debugfs);
> +
>         napi = &rxq->rx_cq.napi;
>
>         if (napi_initialized) {
> @@ -2308,6 +2381,28 @@ static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc,
>         return NULL;
>  }
>
> +static void mana_create_rxq_debugfs(struct mana_port_context *apc, int idx)
> +{
> +       char qnum[32];
> +       struct mana_rxq *rxq;
[Kalesh] Maintain RCT order here
> +
> +       rxq = apc->rxqs[idx];
> +
> +       sprintf(qnum, "RX-%d", idx);
> +       rxq->mana_rx_debugfs = debugfs_create_dir(qnum, apc->mana_port_debugfs);
> +       debugfs_create_u32("rq_head", 0400, rxq->mana_rx_debugfs, &rxq->gdma_rq->head);
> +       debugfs_create_u32("rq_tail", 0400, rxq->mana_rx_debugfs, &rxq->gdma_rq->tail);
> +       debugfs_create_u32("rq_nbuf", 0400, rxq->mana_rx_debugfs, &rxq->num_rx_buf);
> +       debugfs_create_u32("cq_head", 0400, rxq->mana_rx_debugfs,
> +                          &rxq->rx_cq.gdma_cq->head);
> +       debugfs_create_u32("cq_tail", 0400, rxq->mana_rx_debugfs,
> +                          &rxq->rx_cq.gdma_cq->tail);
> +       debugfs_create_u32("cq_budget", 0400, rxq->mana_rx_debugfs, &rxq->rx_cq.budget);
> +       debugfs_create_file("rxq_dump", 0400, rxq->mana_rx_debugfs, rxq->gdma_rq, &mana_dbg_q_fops);
> +       debugfs_create_file("cq_dump", 0400, rxq->mana_rx_debugfs, rxq->rx_cq.gdma_cq,
> +                           &mana_dbg_q_fops);
> +}
> +
>  static int mana_add_rx_queues(struct mana_port_context *apc,
>                               struct net_device *ndev)
>  {
> @@ -2326,6 +2421,8 @@ static int mana_add_rx_queues(struct mana_port_context *apc,
>                 u64_stats_init(&rxq->stats.syncp);
>
>                 apc->rxqs[i] = rxq;
> +
> +               mana_create_rxq_debugfs(apc, i);
>         }
>
>         apc->default_rxobj = apc->rxqs[0]->rxobj;
> @@ -2518,14 +2615,19 @@ void mana_query_gf_stats(struct mana_port_context *apc)
>  static int mana_init_port(struct net_device *ndev)
>  {
>         struct mana_port_context *apc = netdev_priv(ndev);
> +       struct gdma_dev *gd = apc->ac->gdma_dev;
> +       struct gdma_context *gc;
>         u32 max_txq, max_rxq, max_queues;
>         int port_idx = apc->port_idx;
> +       char vport[32];
[Kalesh] Maintain RCT order while declaring variables
>         int err;
>
>         err = mana_init_port_context(apc);
>         if (err)
>                 return err;
>
> +       gc = gd->gdma_context;
> +
>         err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
>                                    &apc->indir_table_sz);
>         if (err) {
> @@ -2542,7 +2644,8 @@ static int mana_init_port(struct net_device *ndev)
>                 apc->num_queues = apc->max_queues;
>
>         eth_hw_addr_set(ndev, apc->mac_addr);
> -
> +       sprintf(vport, "vport%d", port_idx);
> +       apc->mana_port_debugfs = debugfs_create_dir(vport, gc->mana_pci_debugfs);
>         return 0;
>
>  reset_apc:
> diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
> index de47fa533b15..32afb15e46bc 100644
> --- a/include/net/mana/gdma.h
> +++ b/include/net/mana/gdma.h
> @@ -267,7 +267,8 @@ struct gdma_event {
>  struct gdma_queue;
>
>  struct mana_eq {
> -       struct gdma_queue *eq;
> +       struct gdma_queue       *eq;
> +       struct dentry           *mana_eq_debugfs;
>  };
>
>  typedef void gdma_eq_callback(void *context, struct gdma_queue *q,
> @@ -365,6 +366,7 @@ struct gdma_irq_context {
>
>  struct gdma_context {
>         struct device           *dev;
> +       struct dentry           *mana_pci_debugfs;
>
>         /* Per-vPort max number of queues */
>         unsigned int            max_num_queues;
> @@ -878,5 +880,7 @@ int mana_gd_send_request(struct gdma_context *gc, u32 req_len, const void *req,
>                          u32 resp_len, void *resp);
>
>  int mana_gd_destroy_dma_region(struct gdma_context *gc, u64 dma_region_handle);
> +void mana_register_debugfs(void);
> +void mana_unregister_debugfs(void);
>
>  #endif /* _GDMA_H */
> diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
> index f2a5200d8a0f..5ca4941f15ef 100644
> --- a/include/net/mana/mana.h
> +++ b/include/net/mana/mana.h
> @@ -350,6 +350,7 @@ struct mana_rxq {
>         int xdp_rc; /* XDP redirect return code */
>
>         struct page_pool *page_pool;
> +       struct dentry *mana_rx_debugfs;
>
>         /* MUST BE THE LAST MEMBER:
>          * Each receive buffer has an associated mana_recv_buf_oob.
> @@ -363,6 +364,8 @@ struct mana_tx_qp {
>         struct mana_cq tx_cq;
>
>         mana_handle_t tx_object;
> +
> +       struct dentry *mana_tx_debugfs;
>  };
>
>  struct mana_ethtool_stats {
> @@ -407,6 +410,7 @@ struct mana_context {
>         u16 num_ports;
>
>         struct mana_eq *eqs;
> +       struct dentry *mana_eqs_debugfs;
>
>         struct net_device *ports[MAX_PORTS_IN_MANA_DEV];
>  };
> @@ -468,6 +472,9 @@ struct mana_port_context {
>         bool port_st_save; /* Saved port state */
>
>         struct mana_ethtool_stats eth_stats;
> +
> +       /* Debugfs */
> +       struct dentry *mana_port_debugfs;
>  };
>
>  netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev);
> @@ -494,6 +501,7 @@ int mana_pre_alloc_rxbufs(struct mana_port_context *apc, int mtu, int num_queues
>  void mana_pre_dealloc_rxbufs(struct mana_port_context *apc);
>
>  extern const struct ethtool_ops mana_ethtool_ops;
> +extern struct dentry *mana_debugfs_root;
>
>  /* A CQ can be created not associated with any EQ */
>  #define GDMA_CQ_NO_EQ  0xffff
> --
> 2.34.1
>
>


-- 
Regards,
Kalesh A P

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