From: Tom Talpey <tom@talpey.com>
To: longli@microsoft.com, Steve French <sfrench@samba.org>,
linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: Re: [Patch v2 09/15] CIFS: SMBD: Support page offset in RDMA recv
Date: Sat, 23 Jun 2018 22:16:15 -0400 [thread overview]
Message-ID: <1e6b7cb0-98e8-d1fd-cb59-d3344fc70b19@talpey.com> (raw)
In-Reply-To: <20180530194807.31657-10-longli@linuxonhyperv.com>
On 5/30/2018 3:48 PM, Long Li wrote:
> From: Long Li <longli@microsoft.com>
>
> RDMA recv function needs to place data to the correct place starting at
> page offset.
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
> fs/cifs/smbdirect.c | 18 +++++++++++-------
> 1 file changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
> index 6141e3c..ba53c52 100644
> --- a/fs/cifs/smbdirect.c
> +++ b/fs/cifs/smbdirect.c
> @@ -2004,10 +2004,12 @@ static int smbd_recv_buf(struct smbd_connection *info, char *buf,
> * return value: actual data read
> */
> static int smbd_recv_page(struct smbd_connection *info,
> - struct page *page, unsigned int to_read)
> + struct page *page, unsigned int page_offset,
> + unsigned int to_read)
> {
> int ret;
> char *to_address;
> + void *page_address;
>
> /* make sure we have the page ready for read */
> ret = wait_event_interruptible(
> @@ -2015,16 +2017,17 @@ static int smbd_recv_page(struct smbd_connection *info,
> info->reassembly_data_length >= to_read ||
> info->transport_status != SMBD_CONNECTED);
> if (ret)
> - return 0;
> + return ret;
>
> /* now we can read from reassembly queue and not sleep */
> - to_address = kmap_atomic(page);
> + page_address = kmap_atomic(page);
> + to_address = (char *) page_address + page_offset;
>
> log_read(INFO, "reading from page=%p address=%p to_read=%d\n",
> page, to_address, to_read);
>
> ret = smbd_recv_buf(info, to_address, to_read);
> - kunmap_atomic(to_address);
> + kunmap_atomic(page_address);
Is "page" truly not mapped? This kmap/kunmap for each received 4KB is
very expensive. Is there not a way to keep a kva for the reassembly
queue segments?
>
> return ret;
> }
> @@ -2038,7 +2041,7 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
> {
> char *buf;
> struct page *page;
> - unsigned int to_read;
> + unsigned int to_read, page_offset;
> int rc;
>
> info->smbd_recv_pending++;
> @@ -2052,15 +2055,16 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
>
> case READ | ITER_BVEC:
> page = msg->msg_iter.bvec->bv_page;
> + page_offset = msg->msg_iter.bvec->bv_offset;
> to_read = msg->msg_iter.bvec->bv_len;
> - rc = smbd_recv_page(info, page, to_read);
> + rc = smbd_recv_page(info, page, page_offset, to_read);
> break;
>
> default:
> /* It's a bug in upper layer to get there */
> cifs_dbg(VFS, "CIFS: invalid msg type %d\n",
> msg->msg_iter.type);
> - rc = -EIO;
> + rc = -EINVAL;
> }
>
> info->smbd_recv_pending--;
>
next prev parent reply other threads:[~2018-06-24 2:16 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-30 19:47 [Patch v2 00/15] CIFS: Add direct I/O support Long Li
2018-05-30 19:47 ` [Patch v2 01/15] CIFS: Introduce offset for the 1st page in data transfer structures Long Li
2018-05-30 19:47 ` [Patch v2 02/15] CIFS: Add support for direct pages in rdata Long Li
2018-05-30 20:27 ` Ruhl, Michael J
2018-05-30 20:57 ` Long Li
2018-06-24 1:50 ` Tom Talpey
2018-06-25 20:25 ` Long Li
2018-06-25 21:01 ` Jason Gunthorpe
2018-06-26 15:13 ` Tom Talpey
2018-06-27 3:21 ` Long Li
2018-05-30 19:47 ` [Patch v2 03/15] CIFS: Use offset when reading pages Long Li
2018-06-24 1:58 ` Tom Talpey
2018-06-25 20:27 ` Long Li
2018-05-30 19:47 ` [Patch v2 04/15] CIFS: Add support for direct pages in wdata Long Li
2018-06-24 2:01 ` Tom Talpey
2018-06-25 20:34 ` Long Li
2018-05-30 19:47 ` [Patch v2 05/15] CIFS: Calculate the correct request length based on page offset and tail size Long Li
2018-06-24 2:07 ` Tom Talpey
2018-06-25 21:07 ` Long Li
2018-05-30 19:47 ` [Patch v2 06/15] CIFS: Introduce helper function to get page offset and length in smb_rqst Long Li
2018-06-24 2:09 ` Tom Talpey
2018-06-25 21:14 ` Long Li
2018-06-26 13:16 ` Tom Talpey
2018-06-27 3:24 ` Long Li
2018-05-30 19:47 ` [Patch v2 07/15] CIFS: When sending data on socket, pass the correct page offset Long Li
2018-05-30 19:48 ` [Patch v2 08/15] CIFS: SMBD: Support page offset in RDMA send Long Li
2018-06-24 2:11 ` Tom Talpey
2018-06-25 21:23 ` Long Li
2018-05-30 19:48 ` [Patch v2 09/15] CIFS: SMBD: Support page offset in RDMA recv Long Li
2018-06-24 2:16 ` Tom Talpey [this message]
2018-06-25 21:29 ` Long Li
2018-05-30 19:48 ` [Patch v2 10/15] CIFS: SMBD: Support page offset in memory registration Long Li
2018-06-24 2:24 ` Tom Talpey
2018-05-30 19:48 ` [Patch v2 11/15] CIFS: Pass page offset for calculating signature Long Li
2018-06-24 2:27 ` Tom Talpey
2018-06-26 4:15 ` Long Li
2018-05-30 19:48 ` [Patch v2 12/15] CIFS: Pass page offset for encrypting Long Li
2018-06-24 2:28 ` Tom Talpey
2018-05-30 19:48 ` [Patch v2 13/15] CIFS: Add support for direct I/O read Long Li
2018-06-02 5:51 ` kbuild test robot
2018-06-02 7:15 ` kbuild test robot
2018-06-24 2:39 ` Tom Talpey
2018-06-26 4:34 ` Long Li
2018-05-30 19:48 ` [Patch v2 14/15] CIFS: Add support for direct I/O write Long Li
2018-06-24 2:48 ` Tom Talpey
2018-06-26 4:39 ` Long Li
2018-06-26 13:29 ` Tom Talpey
2018-06-27 3:44 ` Long Li
2018-05-30 19:48 ` [Patch v2 15/15] CIFS: Add direct I/O functions to file_operations Long Li
2018-06-07 11:17 ` Pavel Shilovsky
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