Merge tag 'mlx5-fixes-2018-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
Mellanox, mlx5 fixes 2018-05-24

This series includes two mlx5 fixes.

1) add FCS data to checksum complete when required, from Eran Ben
Elisha.

2) Fix A race in IPSec sandbox QP commands, from Yossi Kuperman.

Please pull and let me know if there's any problem.

for -stable v4.15
("net/mlx5e: When RXFCS is set, add FCS data into checksum calculation")
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -615,6 +615,45 @@ static inline bool is_last_ethertype_ip(struct sk_buff *skb, int *network_depth)
 	return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
 }
 
+static __be32 mlx5e_get_fcs(struct sk_buff *skb)
+{
+	int last_frag_sz, bytes_in_prev, nr_frags;
+	u8 *fcs_p1, *fcs_p2;
+	skb_frag_t *last_frag;
+	__be32 fcs_bytes;
+
+	if (!skb_is_nonlinear(skb))
+		return *(__be32 *)(skb->data + skb->len - ETH_FCS_LEN);
+
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	last_frag = &skb_shinfo(skb)->frags[nr_frags - 1];
+	last_frag_sz = skb_frag_size(last_frag);
+
+	/* If all FCS data is in last frag */
+	if (last_frag_sz >= ETH_FCS_LEN)
+		return *(__be32 *)(skb_frag_address(last_frag) +
+				   last_frag_sz - ETH_FCS_LEN);
+
+	fcs_p2 = (u8 *)skb_frag_address(last_frag);
+	bytes_in_prev = ETH_FCS_LEN - last_frag_sz;
+
+	/* Find where the other part of the FCS is - Linear or another frag */
+	if (nr_frags == 1) {
+		fcs_p1 = skb_tail_pointer(skb);
+	} else {
+		skb_frag_t *prev_frag = &skb_shinfo(skb)->frags[nr_frags - 2];
+
+		fcs_p1 = skb_frag_address(prev_frag) +
+			    skb_frag_size(prev_frag);
+	}
+	fcs_p1 -= bytes_in_prev;
+
+	memcpy(&fcs_bytes, fcs_p1, bytes_in_prev);
+	memcpy(((u8 *)&fcs_bytes) + bytes_in_prev, fcs_p2, last_frag_sz);
+
+	return fcs_bytes;
+}
+
 static inline void mlx5e_handle_csum(struct net_device *netdev,
 				     struct mlx5_cqe64 *cqe,
 				     struct mlx5e_rq *rq,
@@ -643,6 +682,9 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
 			skb->csum = csum_partial(skb->data + ETH_HLEN,
 						 network_depth - ETH_HLEN,
 						 skb->csum);
+		if (unlikely(netdev->features & NETIF_F_RXFCS))
+			skb->csum = csum_add(skb->csum,
+					     (__force __wsum)mlx5e_get_fcs(skb));
 		rq->stats.csum_complete++;
 		return;
 	}

drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c

@@ -237,19 +237,17 @@ static void *mlx5_fpga_ipsec_cmd_exec(struct mlx5_core_dev *mdev,
 	context->buf.sg[0].data = &context->command;
 
 	spin_lock_irqsave(&fdev->ipsec->pending_cmds_lock, flags);
-	list_add_tail(&context->list, &fdev->ipsec->pending_cmds);
+	res = mlx5_fpga_sbu_conn_sendmsg(fdev->ipsec->conn, &context->buf);
+	if (!res)
+		list_add_tail(&context->list, &fdev->ipsec->pending_cmds);
 	spin_unlock_irqrestore(&fdev->ipsec->pending_cmds_lock, flags);
 
-	res = mlx5_fpga_sbu_conn_sendmsg(fdev->ipsec->conn, &context->buf);
 	if (res) {
-		mlx5_fpga_warn(fdev, "Failure sending IPSec command: %d\n",
-			       res);
-		spin_lock_irqsave(&fdev->ipsec->pending_cmds_lock, flags);
-		list_del(&context->list);
-		spin_unlock_irqrestore(&fdev->ipsec->pending_cmds_lock, flags);
+		mlx5_fpga_warn(fdev, "Failed to send IPSec command: %d\n", res);
 		kfree(context);
 		return ERR_PTR(res);
 	}
+
 	/* Context will be freed by wait func after completion */
 	return context;
 }