netdev - [PATCH net v3 4/6] cxgb4i: handle non-pdu-aligned rx data

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Message-Id: <201412091732.sB9HWQT0009014@localhost6.localdomain6>
Date:	Tue, 09 Dec 2014 09:32:26 -0800
From:	Karen Xie <kxie@...lsio.com>
To:	linux-scsi@...r.kernel.org, netdev@...r.kernel.org
Cc:	kxie@...lsio.com, hariprasad@...lsio.com, anish@...lsio.com,
	hch@...radead.org, James.Bottomley@...senPartnership.com,
	michaelc@...wisc.edu, davem@...emloft.net
Subject: [PATCH net v3 4/6] cxgb4i: handle non-pdu-aligned rx data

[PATCH net v3 4/6] cxgb4i: handle non-pdu-aligned rx data

From: Karen Xie <kxie@...lsio.com>

Abort the connection upon receiving of cpl_rx_data, which means the pdu cannot be recovered from the tcp stream. This generally is due to pdu header corruption.

Signed-off-by: Karen Xie <kxie@...lsio.com>
---
 drivers/scsi/cxgbi/cxgb4i/cxgb4i.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
index e7a26c0..5c7961a 100644
--- a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
+++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
@@ -1033,6 +1033,27 @@ rel_skb:
 	__kfree_skb(skb);
 }
 
+static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
+	unsigned int tid = GET_TID(cpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (!csk) {
+		pr_err("can't find connection for tid %u.\n", tid);
+	} else {
+		/* not expecting this, reset the connection. */
+		pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
+		spin_lock_bh(&csk->lock);
+		send_abort_req(csk);
+		spin_unlock_bh(&csk->lock);
+	}
+	__kfree_skb(skb);
+}
+
 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 {
 	struct cxgbi_sock *csk;
@@ -1452,6 +1473,7 @@ cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
 	[CPL_SET_TCB_RPL] = do_set_tcb_rpl,
 	[CPL_RX_DATA_DDP] = do_rx_data_ddp,
 	[CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
+	[CPL_RX_DATA] = do_rx_data,
 };
 
 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
--
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