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RDMA/iw_cxgb4: atomic find and reference for listening endpoints
Add get_ep_from_stid() which will atomically find and reference the endpoint struct if found. This avoids touch-after-free races between threads destroying listening endpoints and the CPL processing thread processing an incoming PASS_ACCEPT_REQ CPL. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -342,6 +342,23 @@ static struct c4iw_ep *get_ep_from_tid(struct c4iw_dev *dev, unsigned int tid)
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return ep;
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}
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/*
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* Atomically lookup the ep ptr given the stid and grab a reference on the ep.
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*/
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static struct c4iw_listen_ep *get_ep_from_stid(struct c4iw_dev *dev,
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unsigned int stid)
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{
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struct c4iw_listen_ep *ep;
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unsigned long flags;
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spin_lock_irqsave(&dev->lock, flags);
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ep = idr_find(&dev->stid_idr, stid);
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if (ep)
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c4iw_get_ep(&ep->com);
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spin_unlock_irqrestore(&dev->lock, flags);
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return ep;
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}
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void _c4iw_free_ep(struct kref *kref)
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{
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struct c4iw_ep *ep;
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@ -2306,9 +2323,8 @@ fail:
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static int pass_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
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{
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struct cpl_pass_open_rpl *rpl = cplhdr(skb);
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struct tid_info *t = dev->rdev.lldi.tids;
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unsigned int stid = GET_TID(rpl);
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struct c4iw_listen_ep *ep = lookup_stid(t, stid);
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struct c4iw_listen_ep *ep = get_ep_from_stid(dev, stid);
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if (!ep) {
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PDBG("%s stid %d lookup failure!\n", __func__, stid);
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@ -2317,7 +2333,7 @@ static int pass_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
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PDBG("%s ep %p status %d error %d\n", __func__, ep,
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rpl->status, status2errno(rpl->status));
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c4iw_wake_up(&ep->com.wr_wait, status2errno(rpl->status));
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c4iw_put_ep(&ep->com);
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out:
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return 0;
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}
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@ -2325,12 +2341,12 @@ out:
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static int close_listsrv_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
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{
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struct cpl_close_listsvr_rpl *rpl = cplhdr(skb);
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struct tid_info *t = dev->rdev.lldi.tids;
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unsigned int stid = GET_TID(rpl);
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struct c4iw_listen_ep *ep = lookup_stid(t, stid);
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struct c4iw_listen_ep *ep = get_ep_from_stid(dev, stid);
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PDBG("%s ep %p\n", __func__, ep);
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c4iw_wake_up(&ep->com.wr_wait, status2errno(rpl->status));
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c4iw_put_ep(&ep->com);
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return 0;
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}
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@ -2490,7 +2506,7 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
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unsigned short hdrs;
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u8 tos = PASS_OPEN_TOS_G(ntohl(req->tos_stid));
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parent_ep = lookup_stid(t, stid);
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parent_ep = (struct c4iw_ep *)get_ep_from_stid(dev, stid);
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if (!parent_ep) {
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PDBG("%s connect request on invalid stid %d\n", __func__, stid);
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goto reject;
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@ -2618,6 +2634,8 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
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goto out;
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reject:
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reject_cr(dev, hwtid, skb);
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if (parent_ep)
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c4iw_put_ep(&parent_ep->com);
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out:
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return 0;
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}
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@ -3868,7 +3886,7 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
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struct cpl_pass_accept_req *req = (void *)(rss + 1);
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struct l2t_entry *e;
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struct dst_entry *dst;
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struct c4iw_ep *lep;
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struct c4iw_ep *lep = NULL;
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u16 window;
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struct port_info *pi;
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struct net_device *pdev;
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@ -3893,7 +3911,7 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
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*/
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stid = (__force int) cpu_to_be32((__force u32) rss->hash_val);
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lep = (struct c4iw_ep *)lookup_stid(dev->rdev.lldi.tids, stid);
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lep = (struct c4iw_ep *)get_ep_from_stid(dev, stid);
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if (!lep) {
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PDBG("%s connect request on invalid stid %d\n", __func__, stid);
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goto reject;
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@ -3994,6 +4012,8 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
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free_dst:
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dst_release(dst);
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reject:
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if (lep)
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c4iw_put_ep(&lep->com);
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return 0;
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}
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