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nvme-tcp: fix incorrect h2cdata pdu offset accounting

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[ Upstream commit e371af033c560b9dd1e861f8f0b503142bf0a06c ]

When the controller sends us multiple r2t PDUs in a single
request we need to account for it correctly as our send/recv
context run concurrently (i.e. we get a new r2t with r2t_offset
before we updated our iterator and req->data_sent marker). This
can cause wrong offsets to be sent to the controller.

To fix that, we will first know that this may happen only in
the send sequence of the last page, hence we will take
the r2t_offset to the h2c PDU data_offset, and in
nvme_tcp_try_send_data loop, we make sure to increment
the request markers also when we completed a PDU but
we are expecting more r2t PDUs as we still did not send
the entire data of the request.

Fixes: 825619b09ad3 ("nvme-tcp: fix possible use-after-completion")
Reported-by: Nowak, Lukasz <Lukasz.Nowak@Dell.com>
Tested-by: Nowak, Lukasz <Lukasz.Nowak@Dell.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sagi Grimberg 2021-09-14 18:38:55 +03:00 committed by Greg Kroah-Hartman
parent c6ecdcba9d
commit 419fab1cb0
1 changed files with 10 additions and 3 deletions
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13
drivers/nvme/host/tcp.c
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@ -611,7 +611,7 @@ static int nvme_tcp_setup_h2c_data_pdu(struct nvme_tcp_request *req,
cpu_to_le32(data->hdr.hlen + hdgst + req->pdu_len + ddgst);
data->ttag = pdu->ttag;
data->command_id = nvme_cid(rq);
data->data_offset = cpu_to_le32(req->data_sent);
data->data_offset = pdu->r2t_offset;
data->data_length = cpu_to_le32(req->pdu_len);
return 0;
}
@ -937,7 +937,15 @@ static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
nvme_tcp_ddgst_update(queue->snd_hash, page,
offset, ret);
/* fully successful last write*/
/*
* update the request iterator except for the last payload send
* in the request where we don't want to modify it as we may
* compete with the RX path completing the request.
*/
if (req->data_sent + ret < req->data_len)
nvme_tcp_advance_req(req, ret);
/* fully successful last send in current PDU */
if (last && ret == len) {
if (queue->data_digest) {
nvme_tcp_ddgst_final(queue->snd_hash,
@ -949,7 +957,6 @@ static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
}
return 1;
}
nvme_tcp_advance_req(req, ret);
}
return -EAGAIN;
}