RDMA/iw_cxgb4: handle return value of c4iw_l2t_send() and send_mpa_req()

->In act_open_rpl(), CPL_ERR_TCAM_FULL error handling branch, there is
no handling of the return value of send_fw_act_open_req().
->In send_fw_act_open_req(), there is no handling of return value of
c4iw_l2t_send(), which may cause a ep leak and won't notify upper layers
on connection establish failure.
->send_mpa_req() should act on the return from c4iw_l2t_send() and
return the error to the caller.
->In case of c4iw_l2t_send() failure in send_mpa_req(), returns without
starting the timer and not changing the ep state, which is further
handled by act_establish()
-> In act_establish()?if send_mpa_request's get_skb returns an error,
may cause an ep leak. So handle return value of send_mpa_req()

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 410154c..658ea16 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -217,6 +217,8 @@ static int c4iw_l2t_send(struct c4iw_rdev *rdev, struct sk_buff *skb,
        error = cxgb4_l2t_send(rdev->lldi.ports[0], skb, l2e);
        if (error < 0)
                kfree_skb(skb);
+       else if (error == NET_XMIT_DROP)
+               return -ENOMEM;
        return error < 0 ? error : 0;
 }
 
@@ -879,10 +881,10 @@ clip_release:
        return ret;
 }
 
-static void send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb,
-               u8 mpa_rev_to_use)
+static int send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb,
+                       u8 mpa_rev_to_use)
 {
-       int mpalen, wrlen;
+       int mpalen, wrlen, ret;
        struct fw_ofld_tx_data_wr *req;
        struct mpa_message *mpa;
        struct mpa_v2_conn_params mpa_v2_params;
@@ -898,7 +900,7 @@ static void send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb,
        skb = get_skb(skb, wrlen, GFP_KERNEL);
        if (!skb) {
                connect_reply_upcall(ep, -ENOMEM);
-               return;
+               return -ENOMEM;
        }
        set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
 
@@ -966,12 +968,14 @@ static void send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb,
        t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
        BUG_ON(ep->mpa_skb);
        ep->mpa_skb = skb;
-       c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
+       ret = c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
+       if (ret)
+               return ret;
        start_ep_timer(ep);
        __state_set(&ep->com, MPA_REQ_SENT);
        ep->mpa_attr.initiator = 1;
        ep->snd_seq += mpalen;
-       return;
+       return ret;
 }
 
 static int send_mpa_reject(struct c4iw_ep *ep, const void *pdata, u8 plen)
@@ -1174,9 +1178,11 @@ static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb)
        if (ret)
                goto err;
        if (ep->retry_with_mpa_v1)
-               send_mpa_req(ep, skb, 1);
+               ret = send_mpa_req(ep, skb, 1);
        else
-               send_mpa_req(ep, skb, mpa_rev);
+               ret = send_mpa_req(ep, skb, mpa_rev);
+       if (ret)
+               goto err;
        mutex_unlock(&ep->com.mutex);
        return 0;
 err:
@@ -1850,7 +1856,7 @@ static int abort_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
        return 0;
 }
 
-static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
+static int send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
 {
        struct sk_buff *skb;
        struct fw_ofld_connection_wr *req;
@@ -1920,7 +1926,7 @@ static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
        req->tcb.opt2 = cpu_to_be32((__force u32)req->tcb.opt2);
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, ep->ctrlq_idx);
        set_bit(ACT_OFLD_CONN, &ep->com.history);
-       c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
+       return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t);
 }
 
 /*
@@ -2146,6 +2152,7 @@ static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
        struct sockaddr_in *ra;
        struct sockaddr_in6 *la6;
        struct sockaddr_in6 *ra6;
+       int ret = 0;
 
        ep = lookup_atid(t, atid);
        la = (struct sockaddr_in *)&ep->com.local_addr;
@@ -2181,9 +2188,10 @@ static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
                mutex_unlock(&dev->rdev.stats.lock);
                if (ep->com.local_addr.ss_family == AF_INET &&
                    dev->rdev.lldi.enable_fw_ofld_conn) {
-                       send_fw_act_open_req(ep,
-                                            TID_TID_G(AOPEN_ATID_G(
-                                            ntohl(rpl->atid_status))));
+                       ret = send_fw_act_open_req(ep, TID_TID_G(AOPEN_ATID_G(
+                                                  ntohl(rpl->atid_status))));
+                       if (ret)
+                               goto fail;
                        return 0;
                }
                break;
@@ -2223,6 +2231,7 @@ static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
                break;
        }
 
+fail:
        connect_reply_upcall(ep, status2errno(status));
        state_set(&ep->com, DEAD);