[dpdk-dev] [PATCH 10/12] net/sfc: factor out function to get IPv4 packet ID for TSO

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

As a result, code duplication will be avoided in the current
TSO implementations (EFX and EF10 native). The future patch to
add support for tunnel TSO will also reuse the new function.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/sfc/sfc_ef10_tx.c |  9 ++-------
 drivers/net/sfc/sfc_tso.c     |  9 ++-------
 drivers/net/sfc/sfc_tso.h     | 12 ++++++++++++
 3 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/net/sfc/sfc_ef10_tx.c b/drivers/net/sfc/sfc_ef10_tx.c
index 959408449..bcbd15d55 100644
--- a/drivers/net/sfc/sfc_ef10_tx.c
+++ b/drivers/net/sfc/sfc_ef10_tx.c
@@ -479,13 +479,8 @@ sfc_ef10_xmit_tso_pkt(struct sfc_ef10_txq * const txq, struct rte_mbuf *m_seg,
 	 * filled in in TSO mbuf. Use zero IPID if there is no IPv4 flag.
 	 * If the packet is still IPv4, HW will simply start from zero IPID.
 	 */
-	if (first_m_seg->ol_flags & PKT_TX_IPV4) {
-		const struct ipv4_hdr *iphe4;
-
-		iphe4 = (const struct ipv4_hdr *)(hdr_addr + iph_off);
-		rte_memcpy(&packet_id, &iphe4->packet_id, sizeof(uint16_t));
-		packet_id = rte_be_to_cpu_16(packet_id);
-	}
+	if (first_m_seg->ol_flags & PKT_TX_IPV4)
+		packet_id = sfc_tso_ip4_get_ipid(hdr_addr, iph_off);
 
 	th = (const struct tcp_hdr *)(hdr_addr + tcph_off);
 	rte_memcpy(&sent_seq, &th->sent_seq, sizeof(uint32_t));
diff --git a/drivers/net/sfc/sfc_tso.c b/drivers/net/sfc/sfc_tso.c
index a882e64dd..1374aceaa 100644
--- a/drivers/net/sfc/sfc_tso.c
+++ b/drivers/net/sfc/sfc_tso.c
@@ -146,13 +146,8 @@ sfc_efx_tso_do(struct sfc_efx_txq *txq, unsigned int idx,
 	 * IPv4 flag. If the packet is still IPv4, HW will simply start from
 	 * zero IPID.
 	 */
-	if (m->ol_flags & PKT_TX_IPV4) {
-		const struct ipv4_hdr *iphe4;
-
-		iphe4 = (const struct ipv4_hdr *)(tsoh + nh_off);
-		rte_memcpy(&packet_id, &iphe4->packet_id, sizeof(uint16_t));
-		packet_id = rte_be_to_cpu_16(packet_id);
-	}
+	if (m->ol_flags & PKT_TX_IPV4)
+		packet_id = sfc_tso_ip4_get_ipid(tsoh, nh_off);
 
 	/* Handle TCP header */
 	th = (const struct tcp_hdr *)(tsoh + tcph_off);
diff --git a/drivers/net/sfc/sfc_tso.h b/drivers/net/sfc/sfc_tso.h
index cd151782f..8ecefdfd2 100644
--- a/drivers/net/sfc/sfc_tso.h
+++ b/drivers/net/sfc/sfc_tso.h
@@ -26,6 +26,18 @@ extern "C" {
  */
 #define SFC_EF10_TSO_HDR_DESCS_NUM	1
 
+static inline uint16_t
+sfc_tso_ip4_get_ipid(const uint8_t *pkt_hdrp, size_t ip_hdr_off)
+{
+	const struct ipv4_hdr *ip_hdrp;
+	uint16_t ipid;
+
+	ip_hdrp = (const struct ipv4_hdr *)(pkt_hdrp + ip_hdr_off);
+	rte_memcpy(&ipid, &ip_hdrp->packet_id, sizeof(ipid));
+
+	return rte_be_to_cpu_16(ipid);
+}
+
 unsigned int sfc_tso_prepare_header(uint8_t *tsoh, size_t header_len,
 				    struct rte_mbuf **in_seg, size_t *in_off);
 
-- 
2.17.1