netdev - Re: [PATCH net v3] octeontx2-af: Initialize maps.

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Date: Wed, 31 Jan 2024 09:30:53 -0800
From: Brett Creeley <bcreeley@....com>
To: Ratheesh Kannoth <rkannoth@...vell.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: sgoutham@...vell.com, davem@...emloft.net, edumazet@...gle.com,
 horms@...nel.org, kuba@...nel.org, pabeni@...hat.com, sbhatta@...vell.com,
 gakula@...vell.com, hkelam@...vell.com, sumang@...vell.com
Subject: Re: [PATCH net v3] octeontx2-af: Initialize maps.

On 1/30/2024 6:41 PM, Ratheesh Kannoth wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> kmalloc_array() without __GFP_ZERO flag does not initialize
> memory to zero. This causes issues. Use __GFP_ZERO flag for maps and
> bitmap_zalloc() for bimaps.
> 
> Fixes: dd7842878633 ("octeontx2-af: Add new devlink param to configure maximum usable NIX block LFs")
> Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>
> ---
> 
> ChangeLogs:
> v2 -> v3: Used GFP_ZERO for normal map arrays
> v1 -> v2: Used bitmap_zalloc() API.
> v0 -> v1: Removed devm_kcalloc()._
> ---
>   .../ethernet/marvell/octeontx2/af/rvu_npc.c   | 26 ++++++++++---------
>   1 file changed, 14 insertions(+), 12 deletions(-)

LGTM.

Reviewed-by: Brett Creeley <brett.creeley@....com>

> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> index 167145bdcb75..6a8f0efd96a5 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> @@ -1850,8 +1850,8 @@ void npc_mcam_rsrcs_deinit(struct rvu *rvu)
>   {
>          struct npc_mcam *mcam = &rvu->hw->mcam;
> 
> -       kfree(mcam->bmap);
> -       kfree(mcam->bmap_reverse);
> +       bitmap_free(mcam->bmap);
> +       bitmap_free(mcam->bmap_reverse);
>          kfree(mcam->entry2pfvf_map);
>          kfree(mcam->cntr2pfvf_map);
>          kfree(mcam->entry2cntr_map);
> @@ -1904,13 +1904,11 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
>          mcam->pf_offset = mcam->nixlf_offset + nixlf_count;
> 
>          /* Allocate bitmaps for managing MCAM entries */
> -       mcam->bmap = kmalloc_array(BITS_TO_LONGS(mcam->bmap_entries),
> -                                  sizeof(long), GFP_KERNEL);
> +       mcam->bmap = bitmap_zalloc(mcam->bmap_entries, GFP_KERNEL);
>          if (!mcam->bmap)
>                  return -ENOMEM;
> 
> -       mcam->bmap_reverse = kmalloc_array(BITS_TO_LONGS(mcam->bmap_entries),
> -                                          sizeof(long), GFP_KERNEL);
> +       mcam->bmap_reverse = bitmap_zalloc(mcam->bmap_entries, GFP_KERNEL);
>          if (!mcam->bmap_reverse)
>                  goto free_bmap;
> 
> @@ -1918,7 +1916,8 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
> 
>          /* Alloc memory for saving entry to RVU PFFUNC allocation mapping */
>          mcam->entry2pfvf_map = kmalloc_array(mcam->bmap_entries,
> -                                            sizeof(u16), GFP_KERNEL);
> +                                            sizeof(u16),
> +                                            GFP_KERNEL | __GFP_ZERO);
>          if (!mcam->entry2pfvf_map)
>                  goto free_bmap_reverse;
> 
> @@ -1942,7 +1941,8 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
>                  goto free_entry_map;
> 
>          mcam->cntr2pfvf_map = kmalloc_array(mcam->counters.max,
> -                                           sizeof(u16), GFP_KERNEL);
> +                                           sizeof(u16),
> +                                           GFP_KERNEL | __GFP_ZERO);
>          if (!mcam->cntr2pfvf_map)
>                  goto free_cntr_bmap;
> 
> @@ -1950,12 +1950,14 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
>           * counter's reference count.
>           */
>          mcam->entry2cntr_map = kmalloc_array(mcam->bmap_entries,
> -                                            sizeof(u16), GFP_KERNEL);
> +                                            sizeof(u16),
> +                                            GFP_KERNEL | __GFP_ZERO);
>          if (!mcam->entry2cntr_map)
>                  goto free_cntr_map;
> 
>          mcam->cntr_refcnt = kmalloc_array(mcam->counters.max,
> -                                         sizeof(u16), GFP_KERNEL);
> +                                         sizeof(u16),
> +                                         GFP_KERNEL | __GFP_ZERO);
>          if (!mcam->cntr_refcnt)
>                  goto free_entry_cntr_map;
> 
> @@ -1988,9 +1990,9 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
>   free_entry_map:
>          kfree(mcam->entry2pfvf_map);
>   free_bmap_reverse:
> -       kfree(mcam->bmap_reverse);
> +       bitmap_free(mcam->bmap_reverse);
>   free_bmap:
> -       kfree(mcam->bmap);
> +       bitmap_free(mcam->bmap);
> 
>          return -ENOMEM;
>   }
> --
> 2.25.1