From: David Wei <[email protected]>
To: [email protected], [email protected]
Cc: Jens Axboe <[email protected]>,
Pavel Begunkov <[email protected]>,
Jakub Kicinski <[email protected]>, Paolo Abeni <[email protected]>,
"David S. Miller" <[email protected]>,
Eric Dumazet <[email protected]>,
Jesper Dangaard Brouer <[email protected]>,
David Ahern <[email protected]>,
Mina Almasry <[email protected]>
Subject: [RFC PATCH v3 08/20] io_uring: add mmap support for shared ifq ringbuffers
Date: Tue, 19 Dec 2023 13:03:45 -0800 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
From: David Wei <[email protected]>
This patch adds mmap support for ifq rbuf rings. There are two rings and
a struct io_rbuf_ring that contains the head and tail ptrs into each
ring.
Just like the io_uring SQ/CQ rings, userspace issues a single mmap call
using the io_uring fd w/ magic offset IORING_OFF_RBUF_RING. An opaque
ptr is returned to userspace, which is then expected to use the offsets
returned in the registration struct to get access to the head/tail and
rings.
Signed-off-by: David Wei <[email protected]>
---
include/uapi/linux/io_uring.h | 2 ++
io_uring/io_uring.c | 5 +++++
io_uring/zc_rx.c | 19 ++++++++++++++++++-
3 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 024a6f79323b..839933e562e6 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -428,6 +428,8 @@ enum {
#define IORING_OFF_PBUF_RING 0x80000000ULL
#define IORING_OFF_PBUF_SHIFT 16
#define IORING_OFF_MMAP_MASK 0xf8000000ULL
+#define IORING_OFF_RBUF_RING 0x20000000ULL
+#define IORING_OFF_RBUF_SHIFT 16
/*
* Filled with the offset for mmap(2)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 7fff01d57e9e..02d6d638bd65 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3516,6 +3516,11 @@ static void *io_uring_validate_mmap_request(struct file *file,
return ERR_PTR(-EINVAL);
break;
}
+ case IORING_OFF_RBUF_RING:
+ if (!ctx->ifq)
+ return ERR_PTR(-EINVAL);
+ ptr = ctx->ifq->ring;
+ break;
default:
return ERR_PTR(-EINVAL);
}
diff --git a/io_uring/zc_rx.c b/io_uring/zc_rx.c
index 5fc94cad5e3a..7e3e6f6d446b 100644
--- a/io_uring/zc_rx.c
+++ b/io_uring/zc_rx.c
@@ -61,6 +61,7 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx,
{
struct io_uring_zc_rx_ifq_reg reg;
struct io_zc_rx_ifq *ifq;
+ size_t ring_sz, rqes_sz, cqes_sz;
int ret;
if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
@@ -87,8 +88,24 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx,
ifq->rq_entries = reg.rq_entries;
ifq->cq_entries = reg.cq_entries;
ifq->if_rxq_id = reg.if_rxq_id;
- ctx->ifq = ifq;
+ ring_sz = sizeof(struct io_rbuf_ring);
+ rqes_sz = sizeof(struct io_uring_rbuf_rqe) * ifq->rq_entries;
+ cqes_sz = sizeof(struct io_uring_rbuf_cqe) * ifq->cq_entries;
+ reg.mmap_sz = ring_sz + rqes_sz + cqes_sz;
+ reg.rq_off.rqes = ring_sz;
+ reg.cq_off.cqes = ring_sz + rqes_sz;
+ reg.rq_off.head = offsetof(struct io_rbuf_ring, rq.head);
+ reg.rq_off.tail = offsetof(struct io_rbuf_ring, rq.tail);
+ reg.cq_off.head = offsetof(struct io_rbuf_ring, cq.head);
+ reg.cq_off.tail = offsetof(struct io_rbuf_ring, cq.tail);
+
+ if (copy_to_user(arg, ®, sizeof(reg))) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+ ctx->ifq = ifq;
return 0;
err:
io_zc_rx_ifq_free(ifq);
--
2.39.3
next prev parent reply other threads:[~2023-12-19 21:04 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 21:03 [RFC PATCH v3 00/20] Zero copy Rx using io_uring David Wei
2023-12-19 21:03 ` [RFC PATCH v3 01/20] net: page_pool: add ppiov mangling helper David Wei
2023-12-19 23:22 ` Mina Almasry
2023-12-19 23:59 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 02/20] tcp: don't allow non-devmem originated ppiov David Wei
2023-12-19 23:24 ` Mina Almasry
2023-12-20 1:29 ` Pavel Begunkov
2024-01-02 16:11 ` Mina Almasry
2023-12-19 21:03 ` [RFC PATCH v3 03/20] net: page pool: rework ppiov life cycle David Wei
2023-12-19 23:35 ` Mina Almasry
2023-12-20 0:49 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 04/20] net: enable napi_pp_put_page for ppiov David Wei
2023-12-19 21:03 ` [RFC PATCH v3 05/20] net: page_pool: add ->scrub mem provider callback David Wei
2023-12-19 21:03 ` [RFC PATCH v3 06/20] io_uring: separate header for exported net bits David Wei
2023-12-20 16:01 ` Jens Axboe
2023-12-19 21:03 ` [RFC PATCH v3 07/20] io_uring: add interface queue David Wei
2023-12-20 16:13 ` Jens Axboe
2023-12-20 16:23 ` Pavel Begunkov
2023-12-21 1:44 ` David Wei
2023-12-21 17:57 ` Willem de Bruijn
2023-12-30 16:25 ` Pavel Begunkov
2023-12-31 22:25 ` Willem de Bruijn
2023-12-19 21:03 ` David Wei [this message]
2023-12-20 16:13 ` [RFC PATCH v3 08/20] io_uring: add mmap support for shared ifq ringbuffers Jens Axboe
2023-12-19 21:03 ` [RFC PATCH v3 09/20] netdev: add XDP_SETUP_ZC_RX command David Wei
2023-12-19 21:03 ` [RFC PATCH v3 10/20] io_uring: setup ZC for an Rx queue when registering an ifq David Wei
2023-12-20 16:06 ` Jens Axboe
2023-12-20 16:24 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 11/20] io_uring/zcrx: implement socket registration David Wei
2023-12-19 21:03 ` [RFC PATCH v3 12/20] io_uring: add ZC buf and pool David Wei
2023-12-19 21:03 ` [RFC PATCH v3 13/20] io_uring: implement pp memory provider for zc rx David Wei
2023-12-19 23:44 ` Mina Almasry
2023-12-20 0:39 ` Pavel Begunkov
2023-12-21 19:36 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 14/20] net: page pool: add io_uring memory provider David Wei
2023-12-19 23:39 ` Mina Almasry
2023-12-20 0:04 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 15/20] io_uring: add io_recvzc request David Wei
2023-12-20 16:27 ` Jens Axboe
2023-12-20 17:04 ` Pavel Begunkov
2023-12-20 18:09 ` Jens Axboe
2023-12-21 18:59 ` Pavel Begunkov
2023-12-21 21:32 ` Jens Axboe
2023-12-30 21:15 ` Pavel Begunkov
2023-12-19 21:03 ` [RFC PATCH v3 16/20] net: execute custom callback from napi David Wei
2023-12-19 21:03 ` [RFC PATCH v3 17/20] io_uring/zcrx: add copy fallback David Wei
2023-12-19 21:03 ` [RFC PATCH v3 18/20] veth: add support for io_uring zc rx David Wei
2023-12-19 21:03 ` [RFC PATCH v3 19/20] net: page pool: generalise ppiov dma address get David Wei
2023-12-21 19:51 ` Mina Almasry
2023-12-19 21:03 ` [RFC PATCH v3 20/20] bnxt: enable io_uring zc page pool David Wei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox