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Date: Mon, 29 Jan 2024 09:13:33 -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 v2] octeontx2-af: Initialize bitmap arrays.
On 1/28/2024 9:23 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 with bitmap.
> Use bitmap_zalloc() API to fix this issue.
>
> Fixes: dd7842878633 ("octeontx2-af: Add new devlink param to configure maximum usable NIX block LFs")
> Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>
>
> ChangeLogs:
> v1 -> v2: Used bitmap_zalloc() API.
> v0 -> v1: Removed devm_kcalloc()._
> ---
> .../net/ethernet/marvell/octeontx2/af/rvu.h | 10 ++--
> .../ethernet/marvell/octeontx2/af/rvu_npc.c | 48 ++++++++-----------
> 2 files changed, 26 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> index 43be37dd1f32..679bd6e87066 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> @@ -184,11 +184,11 @@ struct npc_mcam {
> unsigned long *bmap_reverse; /* Reverse bitmap, bmap_entries => 0 */
> u16 bmap_entries; /* Number of unreserved MCAM entries */
> u16 bmap_fcnt; /* MCAM entries free count */
> - u16 *entry2pfvf_map;
> - u16 *entry2cntr_map;
> - u16 *cntr2pfvf_map;
> - u16 *cntr_refcnt;
> - u16 *entry2target_pffunc;
> + unsigned long *entry2pfvf_map;
> + unsigned long *entry2cntr_map;
> + unsigned long *cntr2pfvf_map;
> + unsigned long *cntr_refcnt;
> + unsigned long *entry2target_pffunc;
I'm not sure you want all of these at bitmaps? It was recommended to use
bitmap_zalloc, but that was specifically for the bitmaps.
> u8 keysize; /* MCAM keysize 112/224/448 bits */
> u8 banks; /* Number of MCAM banks */
> u8 banks_per_entry;/* Number of keywords in key */
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> index 167145bdcb75..367f842e365d 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> @@ -1850,13 +1850,13 @@ void npc_mcam_rsrcs_deinit(struct rvu *rvu)
> {
> struct npc_mcam *mcam = &rvu->hw->mcam;
>
> - kfree(mcam->bmap);
> - kfree(mcam->bmap_reverse);
> - kfree(mcam->entry2pfvf_map);
> - kfree(mcam->cntr2pfvf_map);
> - kfree(mcam->entry2cntr_map);
> - kfree(mcam->cntr_refcnt);
> - kfree(mcam->entry2target_pffunc);
> + bitmap_free(mcam->bmap);
> + bitmap_free(mcam->bmap_reverse);
> + bitmap_free(mcam->entry2pfvf_map);
> + bitmap_free(mcam->cntr2pfvf_map);
> + bitmap_free(mcam->entry2cntr_map);
> + bitmap_free(mcam->cntr_refcnt);
> + bitmap_free(mcam->entry2target_pffunc);
> kfree(mcam->counters.bmap);
> }
>
> @@ -1904,21 +1904,18 @@ 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;
>
> mcam->bmap_fcnt = mcam->bmap_entries;
>
> /* Alloc memory for saving entry to RVU PFFUNC allocation mapping */
> - mcam->entry2pfvf_map = kmalloc_array(mcam->bmap_entries,
> - sizeof(u16), GFP_KERNEL);
> + mcam->entry2pfvf_map = bitmap_zalloc(mcam->bmap_entries, GFP_KERNEL);
Are you sure you want to use bitmap_zalloc() here?
> if (!mcam->entry2pfvf_map)
> goto free_bmap_reverse;
>
> @@ -1941,27 +1938,24 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
> if (err)
> goto free_entry_map;
>
> - mcam->cntr2pfvf_map = kmalloc_array(mcam->counters.max,
> - sizeof(u16), GFP_KERNEL);
> + mcam->cntr2pfvf_map = bitmap_zalloc(mcam->counters.max, GFP_KERNEL);
> if (!mcam->cntr2pfvf_map)
> goto free_cntr_bmap;
>
> /* Alloc memory for MCAM entry to counter mapping and for tracking
> * counter's reference count.
> */
> - mcam->entry2cntr_map = kmalloc_array(mcam->bmap_entries,
> - sizeof(u16), GFP_KERNEL);
> + mcam->entry2cntr_map = bitmap_zalloc(mcam->bmap_entries, GFP_KERNEL);
Are you sure you want to use bitmap_zalloc() here?
> if (!mcam->entry2cntr_map)
> goto free_cntr_map;
>
> - mcam->cntr_refcnt = kmalloc_array(mcam->counters.max,
> - sizeof(u16), GFP_KERNEL);
> + mcam->cntr_refcnt = bitmap_zalloc(mcam->counters.max, GFP_KERNEL);
Are you sure you want to use bitmap_zalloc() here?
> if (!mcam->cntr_refcnt)
> goto free_entry_cntr_map;
>
> /* Alloc memory for saving target device of mcam rule */
> - mcam->entry2target_pffunc = kmalloc_array(mcam->total_entries,
> - sizeof(u16), GFP_KERNEL);
> + mcam->entry2target_pffunc = bitmap_zalloc(mcam->total_entries,
> + GFP_KERNEL);
Are you sure you want to use bitmap_zalloc() here?
> if (!mcam->entry2target_pffunc)
> goto free_cntr_refcnt;
>
> @@ -1978,19 +1972,19 @@ int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
> return 0;
>
> free_cntr_refcnt:
> - kfree(mcam->cntr_refcnt);
> + bitmap_free(mcam->cntr_refcnt);
> free_entry_cntr_map:
> - kfree(mcam->entry2cntr_map);
> + bitmap_free(mcam->entry2cntr_map);
> free_cntr_map:
> - kfree(mcam->cntr2pfvf_map);
> + bitmap_free(mcam->cntr2pfvf_map);
> free_cntr_bmap:
> kfree(mcam->counters.bmap);
> free_entry_map:
> - kfree(mcam->entry2pfvf_map);
> + bitmap_free(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
>
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