netdev - Re: [PATCH v1 09/15] io_uring/zcrx: add interface queue and refill queue

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Message-ID: <8d624a0a-3b00-4117-800d-a25314a8a25b@gmail.com>
Date: Wed, 9 Oct 2024 20:08:52 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Jens Axboe <axboe@...nel.dk>, David Wei <dw@...idwei.uk>,
 io-uring@...r.kernel.org, netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>, David Ahern <dsahern@...nel.org>,
 Mina Almasry <almasrymina@...gle.com>
Subject: Re: [PATCH v1 09/15] io_uring/zcrx: add interface queue and refill
 queue

On 10/9/24 18:50, Jens Axboe wrote:
> On 10/7/24 4:15 PM, David Wei wrote:
>> From: David Wei <davidhwei@...a.com>
>>
...
>> diff --git a/io_uring/Makefile b/io_uring/Makefile
>> index 61923e11c767..1a1184f3946a 100644
>> --- a/io_uring/Makefile
>> +++ b/io_uring/Makefile
>> @@ -10,6 +10,7 @@ obj-$(CONFIG_IO_URING)		+= io_uring.o opdef.o kbuf.o rsrc.o notif.o \
>>   					epoll.o statx.o timeout.o fdinfo.o \
>>   					cancel.o waitid.o register.o \
>>   					truncate.o memmap.o
>> +obj-$(CONFIG_PAGE_POOL)	+= zcrx.o
>>   obj-$(CONFIG_IO_WQ)		+= io-wq.o
>>   obj-$(CONFIG_FUTEX)		+= futex.o
>>   obj-$(CONFIG_NET_RX_BUSY_POLL) += napi.o
> 
> I wonder if this should be expressed a bit differently. Probably have a
> CONFIG_IO_URING_ZCRX which depends on CONFIG_INET and CONFIG_PAGE_POOL.
> And then you can also use that rather than doing:
> 
> #if defined(CONFIG_PAGE_POOL) && defined(CONFIG_INET)
> 
> in some spots. Not a big deal, it'll work as-is. And honestly should
> probably cleanup the existing IO_WQ symbol while at it, so perhaps
> better left for after the fact.

I should probably just add not selectable by user
CONFIG_IO_URING_ZCRX and make it depend on INET/etc.


>> +static int io_allocate_rbuf_ring(struct io_zcrx_ifq *ifq,
>> +				 struct io_uring_zcrx_ifq_reg *reg)
>> +{
>> +	size_t off, size;
>> +	void *ptr;
>> +
>> +	off = sizeof(struct io_uring);
>> +	size = off + sizeof(struct io_uring_zcrx_rqe) * reg->rq_entries;
>> +
>> +	ptr = io_pages_map(&ifq->rqe_pages, &ifq->n_rqe_pages, size);
>> +	if (IS_ERR(ptr))
>> +		return PTR_ERR(ptr);
>> +
>> +	ifq->rq_ring = (struct io_uring *)ptr;
>> +	ifq->rqes = (struct io_uring_zcrx_rqe *)((char *)ptr + off);
>> +	return 0;
>> +}
> 
> No need to cast that ptr to char *.

I'll apply it and other small nits, thanks for the review

-- 
Pavel Begunkov