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Date: Sun, 25 Dec 2022 22:00:48 +0530
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
To: Geetha sowjanya <gakula@...vell.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kuba@...nel.org, pabeni@...hat.com, davem@...emloft.net,
edumazet@...gle.com, sbhatta@...vell.com, hkelam@...vell.com,
sgoutham@...vell.com
Subject: Re: [PATCH net] octeontx2-pf: Fix lmtst Id used in aura free
On Fri, Dec 23, 2022 at 6:27 AM Geetha sowjanya <gakula@...vell.com> wrote:
>
> Current code uses per_cpu pointer to get the lmtst_id mapped to
> the core on which aura_free() is executed. Using per_cpu pointer
> without preemption disable causing mismatch between lmtst_id and
> core on which pointer gets freed. This patch fixes the issue by
> disabling preemption around aura_free.
>
> This patch also addresses the memory reservation issue,
> currently NIX, NPA queue context memory is being allocated using
> GFP_KERNEL flag which inturns allocates from memory reserved for
> CMA_DMA. Sizing CMA_DMA memory is getting difficult due to this
> dependency, the more number of interfaces enabled the more the
> CMA_DMA memory requirement.
>
> To fix this issue, GFP_KERNEL flag is replaced with GFP_ATOMIC,
> with this memory will be allocated from unreserved memory.
>
> Fixes: ef6c8da71eaf ("octeontx2-pf: cn10K: Reserve LMTST lines per core")
Two separate issues are being fixed. I think these two fixes should be
separate patches.
> Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
> Signed-off-by: Geetha sowjanya <gakula@...vell.com>
> ---
> .../ethernet/marvell/octeontx2/af/common.h | 2 +-
> .../marvell/octeontx2/nic/otx2_common.c | 30 +++++++++++++------
> 2 files changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/common.h b/drivers/net/ethernet/marvell/octeontx2/af/common.h
> index 8931864ee110..4b4be9ca4d2f 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/common.h
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/common.h
> @@ -61,7 +61,7 @@ static inline int qmem_alloc(struct device *dev, struct qmem **q,
> qmem->entry_sz = entry_sz;
> qmem->alloc_sz = (qsize * entry_sz) + OTX2_ALIGN;
> qmem->base = dma_alloc_attrs(dev, qmem->alloc_sz, &qmem->iova,
> - GFP_KERNEL, DMA_ATTR_FORCE_CONTIGUOUS);
> + GFP_ATOMIC, DMA_ATTR_FORCE_CONTIGUOUS);
> if (!qmem->base)
> return -ENOMEM;
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> index 9e10e7471b88..88f8772a61cd 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> @@ -1012,6 +1012,7 @@ static void otx2_pool_refill_task(struct work_struct *work)
> rbpool = cq->rbpool;
> free_ptrs = cq->pool_ptrs;
>
> + get_cpu();
> while (cq->pool_ptrs) {
> if (otx2_alloc_rbuf(pfvf, rbpool, &bufptr)) {
> /* Schedule a WQ if we fails to free atleast half of the
> @@ -1031,6 +1032,7 @@ static void otx2_pool_refill_task(struct work_struct *work)
> pfvf->hw_ops->aura_freeptr(pfvf, qidx, bufptr + OTX2_HEAD_ROOM);
> cq->pool_ptrs--;
> }
> + put_cpu();
> cq->refill_task_sched = false;
> }
>
> @@ -1368,6 +1370,7 @@ int otx2_sq_aura_pool_init(struct otx2_nic *pfvf)
> if (err)
> goto fail;
>
> + get_cpu();
> /* Allocate pointers and free them to aura/pool */
> for (qidx = 0; qidx < hw->tot_tx_queues; qidx++) {
> pool_id = otx2_get_pool_idx(pfvf, AURA_NIX_SQ, qidx);
> @@ -1376,18 +1379,24 @@ int otx2_sq_aura_pool_init(struct otx2_nic *pfvf)
> sq = &qset->sq[qidx];
> sq->sqb_count = 0;
> sq->sqb_ptrs = kcalloc(num_sqbs, sizeof(*sq->sqb_ptrs), GFP_KERNEL);
> - if (!sq->sqb_ptrs)
> - return -ENOMEM;
> + if (!sq->sqb_ptrs) {
> + err = -ENOMEM;
> + goto err_mem;
> + }
>
> for (ptr = 0; ptr < num_sqbs; ptr++) {
> - if (otx2_alloc_rbuf(pfvf, pool, &bufptr))
> - return -ENOMEM;
> + err = otx2_alloc_rbuf(pfvf, pool, &bufptr);
> + if (err)
> + goto err_mem;
> pfvf->hw_ops->aura_freeptr(pfvf, pool_id, bufptr);
> sq->sqb_ptrs[sq->sqb_count++] = (u64)bufptr;
> }
> }
>
> - return 0;
> +err_mem:
> + put_cpu();
> + return err ? -ENOMEM : 0;
> +
> fail:
> otx2_mbox_reset(&pfvf->mbox.mbox, 0);
> otx2_aura_pool_free(pfvf);
> @@ -1426,18 +1435,21 @@ int otx2_rq_aura_pool_init(struct otx2_nic *pfvf)
> if (err)
> goto fail;
>
> + get_cpu();
> /* Allocate pointers and free them to aura/pool */
> for (pool_id = 0; pool_id < hw->rqpool_cnt; pool_id++) {
> pool = &pfvf->qset.pool[pool_id];
> for (ptr = 0; ptr < num_ptrs; ptr++) {
> - if (otx2_alloc_rbuf(pfvf, pool, &bufptr))
> - return -ENOMEM;
> + err = otx2_alloc_rbuf(pfvf, pool, &bufptr);
> + if (err)
> + goto err_mem;
> pfvf->hw_ops->aura_freeptr(pfvf, pool_id,
> bufptr + OTX2_HEAD_ROOM);
> }
> }
> -
> - return 0;
> +err_mem:
> + put_cpu();
> + return err ? -ENOMEM : 0;
> fail:
> otx2_mbox_reset(&pfvf->mbox.mbox, 0);
> otx2_aura_pool_free(pfvf);
> --
> 2.25.1
>
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