From: Jakub Kicinski <kuba@kernel.org>
To: Michael Chan <michael.chan@broadcom.com>
Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com,
pabeni@redhat.com, gospo@broadcom.com, bpf@vger.kernel.org,
somnath.kotur@broadcom.com,
Jesper Dangaard Brouer <hawk@kernel.org>
Subject: Re: [PATCH net-next 3/3] bnxt_en: Let the page pool manage the DMA mapping
Date: Fri, 28 Jul 2023 17:42:12 -0700 [thread overview]
Message-ID: <20230728174212.64000bdc@kernel.org> (raw)
In-Reply-To: <20230728231829.235716-4-michael.chan@broadcom.com>
On Fri, 28 Jul 2023 16:18:29 -0700 Michael Chan wrote:
> + pp.dma_dir = bp->rx_dir;
> + pp.max_len = BNXT_RX_PAGE_SIZE;
I _think_ you need PAGE_SIZE here.
This should be smaller than PAGE_SIZE only if you're wasting the rest
of the buffer, e.g. MTU is 3k so you know last 1k will never get used.
PAGE_SIZE is always a multiple of BNXT_RX_PAGE so you waste nothing.
Adding Jesper to CC to keep me honest.
> + pp.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
next prev parent reply other threads:[~2023-07-29 0:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-28 23:18 [PATCH net-next 0/3] bnxt_en: Add support for page pool Michael Chan
2023-07-28 23:18 ` [PATCH net-next 1/3] bnxt_en: Fix page pool logic for page size >= 64K Michael Chan
2023-07-29 0:35 ` Jakub Kicinski
2023-07-28 23:18 ` [PATCH net-next 2/3] bnxt_en: Use the unified RX page pool buffers for XDP and non-XDP Michael Chan
2023-07-28 23:18 ` [PATCH net-next 3/3] bnxt_en: Let the page pool manage the DMA mapping Michael Chan
2023-07-29 0:42 ` Jakub Kicinski [this message]
2023-07-31 17:47 ` Jesper Dangaard Brouer
2023-07-31 18:00 ` Jakub Kicinski
2023-07-31 18:16 ` Michael Chan
2023-07-31 18:44 ` Jakub Kicinski
2023-07-31 20:20 ` Michael Chan
2023-07-31 20:44 ` Jakub Kicinski
2023-07-31 21:11 ` Michael Chan
2023-08-01 17:06 ` Jesper Dangaard Brouer
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