crypto: chtls - generic handling of data and hdr

removed redundant check and made TLS PDU and header recv
handling common as received from HW.
Ensure that only tls header is read in cpl_rx_tls_cmp
read-ahead and skb is freed when entire data is processed.

Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: chelsiocrypto

drivers/crypto/chelsio/chtls/chtls.h

@@ -67,11 +67,6 @@ enum {
 	CPL_RET_UNKNOWN_TID = 4    /* unexpected unknown TID */
 };
 
-#define TLS_RCV_ST_READ_HEADER		0xF0
-#define TLS_RCV_ST_READ_BODY		0xF1
-#define TLS_RCV_ST_READ_DONE		0xF2
-#define TLS_RCV_ST_READ_NB		0xF3
-
 #define LISTEN_INFO_HASH_SIZE 32
 #define RSPQ_HASH_BITS 5
 struct listen_info {
@@ -278,6 +273,7 @@ struct tlsrx_cmp_hdr {
 #define TLSRX_HDR_PKT_MAC_ERROR_F        TLSRX_HDR_PKT_MAC_ERROR_V(1U)
 
 #define TLSRX_HDR_PKT_ERROR_M           0x1F
+#define CONTENT_TYPE_ERROR		0x7F
 
 struct ulp_mem_rw {
 	__be32 cmd;
@@ -347,8 +343,8 @@ enum {
 	ULPCB_FLAG_HOLD      = 1 << 3,	/* skb not ready for Tx yet */
 	ULPCB_FLAG_COMPL     = 1 << 4,	/* request WR completion */
 	ULPCB_FLAG_URG       = 1 << 5,	/* urgent data */
-	ULPCB_FLAG_TLS_ND    = 1 << 6, /* payload of zero length */
-	ULPCB_FLAG_NO_HDR    = 1 << 7, /* not a ofld wr */
+	ULPCB_FLAG_TLS_HDR   = 1 << 6,  /* payload with tls hdr */
+	ULPCB_FLAG_NO_HDR    = 1 << 7,  /* not a ofld wr */
 };
 
 /* The ULP mode/submode of an skbuff */

drivers/crypto/chelsio/chtls/chtls_cm.c

@@ -1608,12 +1608,14 @@ static void chtls_set_hdrlen(struct sk_buff *skb, unsigned int nlen)
 
 static void chtls_rx_hdr(struct sock *sk, struct sk_buff *skb)
 {
-	struct cpl_rx_tls_cmp *cmp_cpl = cplhdr(skb);
+	struct tlsrx_cmp_hdr *tls_hdr_pkt;
+	struct cpl_rx_tls_cmp *cmp_cpl;
 	struct sk_buff *skb_rec;
 	struct chtls_sock *csk;
 	struct chtls_hws *tlsk;
 	struct tcp_sock *tp;
 
+	cmp_cpl = cplhdr(skb);
 	csk = rcu_dereference_sk_user_data(sk);
 	tlsk = &csk->tlshws;
 	tp = tcp_sk(sk);
@@ -1623,16 +1625,18 @@ static void chtls_rx_hdr(struct sock *sk, struct sk_buff *skb)
 
 	skb_reset_transport_header(skb);
 	__skb_pull(skb, sizeof(*cmp_cpl));
+	tls_hdr_pkt = (struct tlsrx_cmp_hdr *)skb->data;
+	if (tls_hdr_pkt->res_to_mac_error & TLSRX_HDR_PKT_ERROR_M)
+		tls_hdr_pkt->type = CONTENT_TYPE_ERROR;
 	if (!skb->data_len)
-		__skb_trim(skb, CPL_RX_TLS_CMP_LENGTH_G
-				(ntohl(cmp_cpl->pdulength_length)));
+		__skb_trim(skb, TLS_HEADER_LENGTH);
 
 	tp->rcv_nxt +=
 		CPL_RX_TLS_CMP_PDULENGTH_G(ntohl(cmp_cpl->pdulength_length));
 
+	ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_TLS_HDR;
 	skb_rec = __skb_dequeue(&tlsk->sk_recv_queue);
 	if (!skb_rec) {
-		ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_TLS_ND;
 		__skb_queue_tail(&sk->sk_receive_queue, skb);
 	} else {
 		chtls_set_hdrlen(skb, tlsk->pldlen);

drivers/crypto/chelsio/chtls/chtls_io.c

@@ -1449,64 +1449,34 @@ static int chtls_pt_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 				}
 			}
 		}
-		if (hws->rstate == TLS_RCV_ST_READ_BODY) {
-			if (skb_copy_datagram_msg(skb, offset,
-						  msg, avail)) {
-				if (!copied) {
-					copied = -EFAULT;
-					break;
-				}
-			}
-		} else {
-			struct tlsrx_cmp_hdr *tls_hdr_pkt =
-				(struct tlsrx_cmp_hdr *)skb->data;
-
-			if ((tls_hdr_pkt->res_to_mac_error &
-			    TLSRX_HDR_PKT_ERROR_M))
-				tls_hdr_pkt->type = 0x7F;
-
-			/* CMP pld len is for recv seq */
-			hws->rcvpld = skb->hdr_len;
-			if (skb_copy_datagram_msg(skb, offset, msg, avail)) {
-				if (!copied) {
-					copied = -EFAULT;
-					break;
-				}
+		if (skb_copy_datagram_msg(skb, offset, msg, avail)) {
+			if (!copied) {
+				copied = -EFAULT;
+				break;
 			}
 		}
+
 		copied += avail;
 		len -= avail;
 		hws->copied_seq += avail;
 skip_copy:
 		if (tp->urg_data && after(tp->copied_seq, tp->urg_seq))
 			tp->urg_data = 0;
 
-		if (hws->rstate == TLS_RCV_ST_READ_BODY &&
-		    (avail + offset) >= skb->len) {
+		if ((avail + offset) >= skb->len) {
 			if (likely(skb))
 				chtls_free_skb(sk, skb);
 			buffers_freed++;
-			hws->rstate = TLS_RCV_ST_READ_HEADER;
-			atomic_inc(&adap->chcr_stats.tls_pdu_rx);
-			tp->copied_seq += hws->rcvpld;
+			if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_TLS_HDR) {
+				tp->copied_seq += skb->len;
+				hws->rcvpld = skb->hdr_len;
+			} else {
+				tp->copied_seq += hws->rcvpld;
+			}
 			hws->copied_seq = 0;
 			if (copied >= target &&
 			    !skb_peek(&sk->sk_receive_queue))
 				break;
-		} else {
-			if (likely(skb)) {
-				if (ULP_SKB_CB(skb)->flags &
-				    ULPCB_FLAG_TLS_ND)
-					hws->rstate =
-						TLS_RCV_ST_READ_HEADER;
-				else
-					hws->rstate =
-						TLS_RCV_ST_READ_BODY;
-				chtls_free_skb(sk, skb);
-			}
-			buffers_freed++;
-			tp->copied_seq += avail;
-			hws->copied_seq = 0;
 		}
 	} while (len > 0);