From: Jakub Kicinski <kuba@kernel•org>
To: Dipayaan Roy <dipayanroy@linux•microsoft.com>
Cc: kys@microsoft•com, haiyangz@microsoft•com, wei.liu@kernel•org,
decui@microsoft•com, andrew+netdev@lunn•ch, davem@davemloft•net,
edumazet@google•com, pabeni@redhat•com, leon@kernel•org,
longli@microsoft•com, kotaranov@microsoft•com, horms@kernel•org,
shradhagupta@linux•microsoft.com, ssengar@linux•microsoft.com,
ernis@linux•microsoft.com, shirazsaleem@microsoft•com,
linux-hyperv@vger•kernel.org, netdev@vger•kernel.org,
linux-kernel@vger•kernel.org, linux-rdma@vger•kernel.org,
stephen@networkplumber•org, jacob.e.keller@intel•com,
dipayanroy@microsoft•com, leitao@debian•org, kees@kernel•org,
john.fastabend@gmail•com, hawk@kernel•org, bpf@vger•kernel.org,
daniel@iogearbox•net, ast@kernel•org, sdf@fomichev•me,
yury.norov@gmail•com
Subject: Re: [PATCH net-next] net: mana: Force single RX buffer per page for CVM/encrypted guest memory
Date: Mon, 27 Apr 2026 16:21:00 -0700 [thread overview]
Message-ID: <20260427162100.5f731228@kernel.org> (raw)
In-Reply-To: <ae9pxvJfkAZYfKMf@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
On Mon, 27 Apr 2026 06:51:02 -0700 Dipayaan Roy wrote:
> When page_pool allocates sub-page RX buffer fragments, the bounce buffer
> granularity may not align with these smaller fragment sizes, leading to
> failure in mana driver rx path.
>
> Refactor the RX buffer decision into mana_use_single_rxbuf_per_page().
> When cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT) is true, the driver is
> forced to use a single RX buffer per page. This ensures:
> - Each RX buffer is exactly one PAGE_SIZE.
> - The DMA offset is always 0.
> - SWIOTLB maps full, page-aligned blocks.
As commented on your RFC - I'm not sure why you need this.
prev parent reply other threads:[~2026-04-27 23:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 13:51 [PATCH net-next] net: mana: Force single RX buffer per page for CVM/encrypted guest memory Dipayaan Roy
2026-04-27 23:21 ` Jakub Kicinski [this message]
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