RDMA/nes: Remove LLTX

NETIF_F_LLTX is deprecated. Remove private TX locking from the driver
and remove the NETIF_F_LLTX feature flag.  This also fixes a warning
in some configs that comes from doing skb_linearize() call in the
hard_start_xmit method with IRQs disabled (if HIGHMEM is enabled,
skb_linearize() may end up enabling BHs, which is a no-no if hard IRQs
are disabled in that context).  By getting rid of LLTX, we do not
disable IRQs when skb_linearize() is called.

Remove the sq_lock as it is not needed for non-LLTX.  Fix ethtool not
to show the counter for sq_lock.

Reported-by: aluno3@poczta.onet.pl
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/nes/nes_hw.c

@@ -1644,7 +1644,6 @@ int nes_init_nic_qp(struct nes_device *nesdev, struct net_device *netdev)
 	nesvnic->post_cqp_request = nes_post_cqp_request;
 	nesvnic->mcrq_mcast_filter = NULL;
 
-	spin_lock_init(&nesvnic->nic.sq_lock);
 	spin_lock_init(&nesvnic->nic.rq_lock);
 
 	/* setup the RQ */
@@ -2632,9 +2631,9 @@ void nes_nic_ce_handler(struct nes_device *nesdev, struct nes_hw_nic_cq *cq)
 						} else
 							break;
 					}
+				}
 				if (skb)
 					dev_kfree_skb_any(skb);
-				}
 				nesnic->sq_tail++;
 				nesnic->sq_tail &= nesnic->sq_size-1;
 				if (sq_cqes > 128) {

drivers/infiniband/hw/nes/nes_hw.h

@@ -876,7 +876,6 @@ struct nes_hw_nic {
 	u8 replenishing_rq;
 	u8 reserved;
 
-	spinlock_t sq_lock;
 	spinlock_t rq_lock;
 };
 
@@ -1148,7 +1147,6 @@ struct nes_ib_device;
 struct nes_vnic {
 	struct nes_ib_device *nesibdev;
 	u64 sq_full;
-	u64 sq_locked;
 	u64 tso_requests;
 	u64 segmented_tso_requests;
 	u64 linearized_skbs;