Merge branch 'sfc'

Shradha Shah says:

====================
Cleanup patches for the SFC driver

This patch set consists of some cleanup and housekeeping
patches for the sfc driver.
These patches help to reduce the differences between the in-
tree and out-of-tree driver.

Ben Hutchings (12):
  sfc: Cache skb->data in local variable in efx_ptp_rx()
  sfc: Rewrite adjustment of PPS event in a clearer way
  sfc: Replace TSOH_OFFSET with the equivalent NET_IP_ALIGN
  sfc: Rename 'use_options' variable in tso_start() to clearer
    'use_opt_desc'
  sfc: Remove unused definitions of EF10 user-mode DMA descriptors
  sfc: Correct comment about number of TX queues used on EF10
  sfc: Preserve rx_frm_trunc counters when resizing DMA rings
  sfc: Use canonical pointer type for MAC address in
    efx_set_mac_address()
  sfc: Update product naming
  sfc: Cosmetic changes to self-test from the out-of-tree driver
  sfc: Fail self-test with -EBUSY, not -EIO, if the device is busy
  sfc: Add/remove blank lines to taste

Laurence Evans (1):
  sfc: Removed adhoc scheme to rate limit PTP event queue overflow
    message
====================

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

11 files changed, 65 insertions, 150 deletions

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 174a92f5fe5..3b397987119 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -172,8 +172,8 @@ static int efx_ef10_probe(struct efx_nic *efx)
 	struct efx_ef10_nic_data *nic_data;
 	int i, rc;
 
-	/* We can have one VI for each 8K region.  However we need
-	 * multiple TX queues per channel.
+	/* We can have one VI for each 8K region.  However, until we
+	 * use TX option descriptors we need two TX queues per channel.
 	 */
 	efx->max_channels =
 		min_t(unsigned int,
diff --git a/drivers/net/ethernet/sfc/ef10_regs.h b/drivers/net/ethernet/sfc/ef10_regs.h
index 207ac9a1e3d..62a55dde61d 100644
--- a/drivers/net/ethernet/sfc/ef10_regs.h
+++ b/drivers/net/ethernet/sfc/ef10_regs.h
@@ -227,36 +227,6 @@
 #define	ESF_DZ_RX_KER_BUF_ADDR_LBN 0
 #define	ESF_DZ_RX_KER_BUF_ADDR_WIDTH 48
 
-/* RX_USER_DESC */
-#define	ESF_DZ_RX_USR_RESERVED_LBN 62
-#define	ESF_DZ_RX_USR_RESERVED_WIDTH 2
-#define	ESF_DZ_RX_USR_BYTE_CNT_LBN 48
-#define	ESF_DZ_RX_USR_BYTE_CNT_WIDTH 14
-#define	ESF_DZ_RX_USR_BUF_PAGE_SIZE_LBN 44
-#define	ESF_DZ_RX_USR_BUF_PAGE_SIZE_WIDTH 4
-#define	ESE_DZ_USR_BUF_PAGE_SZ_4MB 10
-#define	ESE_DZ_USR_BUF_PAGE_SZ_1MB 8
-#define	ESE_DZ_USR_BUF_PAGE_SZ_64KB 4
-#define	ESE_DZ_USR_BUF_PAGE_SZ_4KB 0
-#define	ESF_DZ_RX_USR_BUF_ID_OFFSET_LBN 0
-#define	ESF_DZ_RX_USR_BUF_ID_OFFSET_WIDTH 44
-#define	ESF_DZ_RX_USR_4KBPS_BUF_ID_LBN 12
-#define	ESF_DZ_RX_USR_4KBPS_BUF_ID_WIDTH 32
-#define	ESF_DZ_RX_USR_64KBPS_BUF_ID_LBN 16
-#define	ESF_DZ_RX_USR_64KBPS_BUF_ID_WIDTH 28
-#define	ESF_DZ_RX_USR_1MBPS_BUF_ID_LBN 20
-#define	ESF_DZ_RX_USR_1MBPS_BUF_ID_WIDTH 24
-#define	ESF_DZ_RX_USR_4MBPS_BUF_ID_LBN 22
-#define	ESF_DZ_RX_USR_4MBPS_BUF_ID_WIDTH 22
-#define	ESF_DZ_RX_USR_4MBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_RX_USR_4MBPS_BYTE_OFFSET_WIDTH 22
-#define	ESF_DZ_RX_USR_1MBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_RX_USR_1MBPS_BYTE_OFFSET_WIDTH 20
-#define	ESF_DZ_RX_USR_64KBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_RX_USR_64KBPS_BYTE_OFFSET_WIDTH 16
-#define	ESF_DZ_RX_USR_4KBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_RX_USR_4KBPS_BYTE_OFFSET_WIDTH 12
-
 /* TX_CSUM_TSTAMP_DESC */
 #define	ESF_DZ_TX_DESC_IS_OPT_LBN 63
 #define	ESF_DZ_TX_DESC_IS_OPT_WIDTH 1
@@ -338,37 +308,6 @@
 #define	ESF_DZ_TX_TSO_TCP_SEQNO_LBN 0
 #define	ESF_DZ_TX_TSO_TCP_SEQNO_WIDTH 32
 
-/* TX_USER_DESC */
-#define	ESF_DZ_TX_USR_TYPE_LBN 63
-#define	ESF_DZ_TX_USR_TYPE_WIDTH 1
-#define	ESF_DZ_TX_USR_CONT_LBN 62
-#define	ESF_DZ_TX_USR_CONT_WIDTH 1
-#define	ESF_DZ_TX_USR_BYTE_CNT_LBN 48
-#define	ESF_DZ_TX_USR_BYTE_CNT_WIDTH 14
-#define	ESF_DZ_TX_USR_BUF_PAGE_SIZE_LBN 44
-#define	ESF_DZ_TX_USR_BUF_PAGE_SIZE_WIDTH 4
-#define	ESE_DZ_USR_BUF_PAGE_SZ_4MB 10
-#define	ESE_DZ_USR_BUF_PAGE_SZ_1MB 8
-#define	ESE_DZ_USR_BUF_PAGE_SZ_64KB 4
-#define	ESE_DZ_USR_BUF_PAGE_SZ_4KB 0
-#define	ESF_DZ_TX_USR_BUF_ID_OFFSET_LBN 0
-#define	ESF_DZ_TX_USR_BUF_ID_OFFSET_WIDTH 44
-#define	ESF_DZ_TX_USR_4KBPS_BUF_ID_LBN 12
-#define	ESF_DZ_TX_USR_4KBPS_BUF_ID_WIDTH 32
-#define	ESF_DZ_TX_USR_64KBPS_BUF_ID_LBN 16
-#define	ESF_DZ_TX_USR_64KBPS_BUF_ID_WIDTH 28
-#define	ESF_DZ_TX_USR_1MBPS_BUF_ID_LBN 20
-#define	ESF_DZ_TX_USR_1MBPS_BUF_ID_WIDTH 24
-#define	ESF_DZ_TX_USR_4MBPS_BUF_ID_LBN 22
-#define	ESF_DZ_TX_USR_4MBPS_BUF_ID_WIDTH 22
-#define	ESF_DZ_TX_USR_4MBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_TX_USR_4MBPS_BYTE_OFFSET_WIDTH 22
-#define	ESF_DZ_TX_USR_1MBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_TX_USR_1MBPS_BYTE_OFFSET_WIDTH 20
-#define	ESF_DZ_TX_USR_64KBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_TX_USR_64KBPS_BYTE_OFFSET_WIDTH 16
-#define	ESF_DZ_TX_USR_4KBPS_BYTE_OFFSET_LBN 0
-#define	ESF_DZ_TX_USR_4KBPS_BYTE_OFFSET_WIDTH 12
 /*************************************************************************/
 
 /* TX_DESC_UPD_REG: Transmit descriptor update register.
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 83d46434702..62d1a78984c 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -503,8 +503,6 @@ static int efx_probe_channel(struct efx_channel *channel)
 			goto fail;
 	}
 
-	channel->n_rx_frm_trunc = 0;
-
 	return 0;
 
 fail:
@@ -2115,7 +2113,7 @@ static int efx_set_mac_address(struct net_device *net_dev, void *data)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
 	struct sockaddr *addr = data;
-	char *new_addr = addr->sa_data;
+	u8 *new_addr = addr->sa_data;
 
 	if (!is_valid_ether_addr(new_addr)) {
 		netif_err(efx, drv, efx->net_dev,
@@ -3273,6 +3271,6 @@ module_exit(efx_exit_module);
 
 MODULE_AUTHOR("Solarflare Communications and "
 	      "Michael Brown <mbrown@fensystems.co.uk>");
-MODULE_DESCRIPTION("Solarflare Communications network driver");
+MODULE_DESCRIPTION("Solarflare network driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, efx_pci_table);
diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h
index dbd7b78fe01..99032581336 100644
--- a/drivers/net/ethernet/sfc/efx.h
+++ b/drivers/net/ethernet/sfc/efx.h
@@ -14,7 +14,7 @@
 #include "net_driver.h"
 #include "filter.h"
 
-/* Solarstorm controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
+/* All controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
 #define EFX_MEM_BAR 2
 
 /* TX */
diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c
index 229428915aa..89fcaffd7de 100644
--- a/drivers/net/ethernet/sfc/ethtool.c
+++ b/drivers/net/ethernet/sfc/ethtool.c
@@ -251,6 +251,9 @@ static void efx_fill_test(unsigned int test_index, u8 *strings, u64 *data,
  * @test_index:		Starting index of the test
  * @strings:		Ethtool strings, or %NULL
  * @data:		Ethtool test results, or %NULL
+ *
+ * Fill in a block of loopback self-test entries.  Return new test
+ * index.
  */
 static int efx_fill_loopback_test(struct efx_nic *efx,
 				  struct efx_loopback_self_tests *lb_tests,
@@ -290,6 +293,12 @@ static int efx_fill_loopback_test(struct efx_nic *efx,
  * @tests:		Efx self-test results structure, or %NULL
  * @strings:		Ethtool strings, or %NULL
  * @data:		Ethtool test results, or %NULL
+ *
+ * Get self-test number of strings, strings, and/or test results.
+ * Return number of strings (== number of test results).
+ *
+ * The reason for merging these three functions is to make sure that
+ * they can never be inconsistent.
  */
 static int efx_ethtool_fill_self_tests(struct efx_nic *efx,
 				       struct efx_self_tests *tests,
@@ -444,7 +453,7 @@ static void efx_ethtool_self_test(struct net_device *net_dev,
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
 	struct efx_self_tests *efx_tests;
-	int already_up;
+	bool already_up;
 	int rc = -ENOMEM;
 
 	efx_tests = kzalloc(sizeof(*efx_tests), GFP_KERNEL);
@@ -452,8 +461,8 @@ static void efx_ethtool_self_test(struct net_device *net_dev,
 		goto fail;
 
 	if (efx->state != STATE_READY) {
-		rc = -EIO;
-		goto fail1;
+		rc = -EBUSY;
+		goto out;
 	}
 
 	netif_info(efx, drv, efx->net_dev, "starting %sline testing\n",
@@ -466,7 +475,7 @@ static void efx_ethtool_self_test(struct net_device *net_dev,
 		if (rc) {
 			netif_err(efx, drv, efx->net_dev,
 				  "failed opening device.\n");
-			goto fail1;
+			goto out;
 		}
 	}
 
@@ -479,8 +488,7 @@ static void efx_ethtool_self_test(struct net_device *net_dev,
 		   rc == 0 ? "passed" : "failed",
 		   (test->flags & ETH_TEST_FL_OFFLINE) ? "off" : "on");
 
-fail1:
-	/* Fill ethtool results structures */
+out:
 	efx_ethtool_fill_self_tests(efx, efx_tests, NULL, data);
 	kfree(efx_tests);
 fail:
@@ -691,7 +699,6 @@ static void efx_ethtool_get_pauseparam(struct net_device *net_dev,
 	pause->autoneg = !!(efx->wanted_fc & EFX_FC_AUTO);
 }
 
-
 static void efx_ethtool_get_wol(struct net_device *net_dev,
 				struct ethtool_wolinfo *wol)
 {
diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c
index 18d6f761f4d..72652f38024 100644
--- a/drivers/net/ethernet/sfc/falcon.c
+++ b/drivers/net/ethernet/sfc/falcon.c
@@ -422,7 +422,6 @@ static inline void falcon_irq_ack_a1(struct efx_nic *efx)
 	efx_readd(efx, &reg, FR_AA_WORK_AROUND_BROKEN_PCI_READS);
 }
 
-
 static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
 {
 	struct efx_nic *efx = dev_id;
@@ -467,6 +466,7 @@ static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
 		efx_schedule_channel_irq(efx_get_channel(efx, 1));
 	return IRQ_HANDLED;
 }
+
 /**************************************************************************
  *
  * RSS
@@ -1358,6 +1358,7 @@ static void falcon_reconfigure_mac_wrapper(struct efx_nic *efx)
 	case 100:   link_speed = 1; break;
 	default:    link_speed = 0; break;
 	}
+
 	/* MAC_LINK_STATUS controls MAC backpressure but doesn't work
 	 * as advertised.  Disable to ensure packets are not
 	 * indefinitely held and TX queue can be flushed at any point
@@ -2868,4 +2869,3 @@ const struct efx_nic_type falcon_b0_nic_type = {
 	.mcdi_max_ver = -1,
 	.max_rx_ip_filters = FR_BZ_RX_FILTER_TBL0_ROWS,
 };
-
diff --git a/drivers/net/ethernet/sfc/farch.c b/drivers/net/ethernet/sfc/farch.c
index f72489a105c..aa1b169f45e 100644
--- a/drivers/net/ethernet/sfc/farch.c
+++ b/drivers/net/ethernet/sfc/farch.c
@@ -311,7 +311,6 @@ static inline void efx_farch_push_tx_desc(struct efx_tx_queue *tx_queue,
  */
 void efx_farch_tx_write(struct efx_tx_queue *tx_queue)
 {
-
 	struct efx_tx_buffer *buffer;
 	efx_qword_t *txd;
 	unsigned write_ptr;
@@ -1609,7 +1608,6 @@ irqreturn_t efx_farch_msi_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-
 /* Setup RSS indirection table.
  * This maps from the hash value of the packet to RXQ
  */
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index af2b8c59a90..8a400a0595e 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -1323,7 +1323,6 @@ static inline struct efx_rx_buffer *efx_rx_buffer(struct efx_rx_queue *rx_queue,
 	return &rx_queue->buffer[index];
 }
 
-
 /**
  * EFX_MAX_FRAME_LEN - calculate maximum frame length
  *
diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c
index 79226b19e3c..32d969e857f 100644
--- a/drivers/net/ethernet/sfc/nic.c
+++ b/drivers/net/ethernet/sfc/nic.c
@@ -530,4 +530,3 @@ void efx_nic_fix_nodesc_drop_stat(struct efx_nic *efx, u64 *rx_nodesc_drops)
 	efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP);
 	*rx_nodesc_drops -= efx->rx_nodesc_drops_while_down;
 }
-
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index eb75fbd11a0..28275e395cb 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -223,7 +223,6 @@ struct efx_ptp_timeset {
  * @evt_list: List of MC receive events awaiting packets
  * @evt_free_list: List of free events
  * @evt_lock: Lock for manipulating evt_list and evt_free_list
- * @evt_overflow: Boolean indicating that event list has overflowed
  * @rx_evts: Instantiated events (on evt_list and evt_free_list)
  * @workwq: Work queue for processing pending PTP operations
  * @work: Work task
@@ -275,7 +274,6 @@ struct efx_ptp_data {
 	struct list_head evt_list;
 	struct list_head evt_free_list;
 	spinlock_t evt_lock;
-	bool evt_overflow;
 	struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS];
 	struct workqueue_struct *workwq;
 	struct work_struct work;
@@ -768,37 +766,36 @@ efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf),
 		return -EAGAIN;
 	}
 
-	/* Convert the NIC time into kernel time. No correction is required-
-	 * this time is the output of a firmware process.
-	 */
-	mc_time = ptp->nic_to_kernel_time(ptp->timeset[last_good].major,
-					  ptp->timeset[last_good].minor, 0);
-
-	/* Calculate delay from actual PPS to last_time */
-	delta = ktime_to_timespec(mc_time);
-	delta.tv_nsec +=
-		last_time->ts_real.tv_nsec -
-		(ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK);
-
-	/* It is possible that the seconds rolled over between taking
+	/* Calculate delay from last good sync (host time) to last_time.
+	 * It is possible that the seconds rolled over between taking
 	 * the start reading and the last value written by the host.  The
 	 * timescales are such that a gap of more than one second is never
-	 * expected.
+	 * expected.  delta is *not* normalised.
 	 */
 	start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS;
 	last_sec = last_time->ts_real.tv_sec & MC_SECOND_MASK;
-	if (start_sec != last_sec) {
-		if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) {
-			netif_warn(efx, hw, efx->net_dev,
-				   "PTP bad synchronisation seconds\n");
-			return -EAGAIN;
-		} else {
-			delta.tv_sec = 1;
-		}
-	} else {
-		delta.tv_sec = 0;
+	if (start_sec != last_sec &&
+	    ((start_sec + 1) & MC_SECOND_MASK) != last_sec) {
+		netif_warn(efx, hw, efx->net_dev,
+			   "PTP bad synchronisation seconds\n");
+		return -EAGAIN;
 	}
+	delta.tv_sec = (last_sec - start_sec) & 1;
+	delta.tv_nsec =
+		last_time->ts_real.tv_nsec -
+		(ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK);
+
+	/* Convert the NIC time at last good sync into kernel time.
+	 * No correction is required - this time is the output of a
+	 * firmware process.
+	 */
+	mc_time = ptp->nic_to_kernel_time(ptp->timeset[last_good].major,
+					  ptp->timeset[last_good].minor, 0);
+
+	/* Calculate delay from NIC top of second to last_time */
+	delta.tv_nsec += ktime_to_timespec(mc_time).tv_nsec;
 
+	/* Set PPS timestamp to match NIC top of second */
 	ptp->host_time_pps = *last_time;
 	pps_sub_ts(&ptp->host_time_pps, delta);
 
@@ -941,11 +938,6 @@ static void efx_ptp_drop_time_expired_events(struct efx_nic *efx)
 			}
 		}
 	}
-	/* If the event overflow flag is set and the event list is now empty
-	 * clear the flag to re-enable the overflow warning message.
-	 */
-	if (ptp->evt_overflow && list_empty(&ptp->evt_list))
-		ptp->evt_overflow = false;
 	spin_unlock_bh(&ptp->evt_lock);
 }
 
@@ -989,11 +981,6 @@ static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx,
 			break;
 		}
 	}
-	/* If the event overflow flag is set and the event list is now empty
-	 * clear the flag to re-enable the overflow warning message.
-	 */
-	if (ptp->evt_overflow && list_empty(&ptp->evt_list))
-		ptp->evt_overflow = false;
 	spin_unlock_bh(&ptp->evt_lock);
 
 	return rc;
@@ -1147,7 +1134,6 @@ static int efx_ptp_stop(struct efx_nic *efx)
 	list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) {
 		list_move(cursor, &efx->ptp_data->evt_free_list);
 	}
-	ptp->evt_overflow = false;
 	spin_unlock_bh(&efx->ptp_data->evt_lock);
 
 	return rc;
@@ -1253,7 +1239,6 @@ int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel)
 	spin_lock_init(&ptp->evt_lock);
 	for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++)
 		list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list);
-	ptp->evt_overflow = false;
 
 	/* Get the NIC PTP attributes and set up time conversions */
 	rc = efx_ptp_get_attributes(efx);
@@ -1380,6 +1365,7 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
 	struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb;
 	u8 *match_data_012, *match_data_345;
 	unsigned int version;
+	u8 *data;
 
 	match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS);
 
@@ -1388,7 +1374,8 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
 		if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) {
 			return false;
 		}
-		version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]);
+		data = skb->data;
+		version = ntohs(*(__be16 *)&data[PTP_V1_VERSION_OFFSET]);
 		if (version != PTP_VERSION_V1) {
 			return false;
 		}
@@ -1396,13 +1383,14 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
 		/* PTP V1 uses all six bytes of the UUID to match the packet
 		 * to the timestamp
 		 */
-		match_data_012 = skb->data + PTP_V1_UUID_OFFSET;
-		match_data_345 = skb->data + PTP_V1_UUID_OFFSET + 3;
+		match_data_012 = data + PTP_V1_UUID_OFFSET;
+		match_data_345 = data + PTP_V1_UUID_OFFSET + 3;
 	} else {
 		if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) {
 			return false;
 		}
-		version = skb->data[PTP_V2_VERSION_OFFSET];
+		data = skb->data;
+		version = data[PTP_V2_VERSION_OFFSET];
 		if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) {
 			return false;
 		}
@@ -1414,17 +1402,17 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
 		 * enhanced mode fixes this issue and uses bytes 0-2
 		 * and byte 5-7 of the UUID.
 		 */
-		match_data_345 = skb->data + PTP_V2_UUID_OFFSET + 5;
+		match_data_345 = data + PTP_V2_UUID_OFFSET + 5;
 		if (ptp->mode == MC_CMD_PTP_MODE_V2) {
-			match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 2;
+			match_data_012 = data + PTP_V2_UUID_OFFSET + 2;
 		} else {
-			match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 0;
+			match_data_012 = data + PTP_V2_UUID_OFFSET + 0;
 			BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED);
 		}
 	}
 
 	/* Does this packet require timestamping? */
-	if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) {
+	if (ntohs(*(__be16 *)&data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) {
 		match->state = PTP_PACKET_STATE_UNMATCHED;
 
 		/* We expect the sequence number to be in the same position in
@@ -1440,8 +1428,8 @@ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb)
 				   (match_data_345[0] << 24));
 		match->words[1] = (match_data_345[1]         |
 				   (match_data_345[2] << 8)  |
-				   (skb->data[PTP_V1_SEQUENCE_OFFSET +
-					      PTP_V1_SEQUENCE_LENGTH - 1] <<
+				   (data[PTP_V1_SEQUENCE_OFFSET +
+					 PTP_V1_SEQUENCE_LENGTH - 1] <<
 				    16));
 	} else {
 		match->state = PTP_PACKET_STATE_MATCH_UNWANTED;
@@ -1635,13 +1623,9 @@ static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp)
 		list_add_tail(&evt->link, &ptp->evt_list);
 
 		queue_work(ptp->workwq, &ptp->work);
-	} else if (!ptp->evt_overflow) {
-		/* Log a warning message and set the event overflow flag.
-		 * The message won't be logged again until the event queue
-		 * becomes empty.
-		 */
+	} else if (net_ratelimit()) {
+		/* Log a rate-limited warning message. */
 		netif_err(efx, rx_err, efx->net_dev, "PTP event queue overflow\n");
-		ptp->evt_overflow = true;
 	}
 	spin_unlock_bh(&ptp->evt_lock);
 }
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 75d11fa4eb0..fa947530041 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -787,15 +787,6 @@ void efx_remove_tx_queue(struct efx_tx_queue *tx_queue)
  * Requires TX checksum offload support.
  */
 
-/* Number of bytes inserted at the start of a TSO header buffer,
- * similar to NET_IP_ALIGN.
- */
-#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-#define TSOH_OFFSET	0
-#else
-#define TSOH_OFFSET	NET_IP_ALIGN
-#endif
-
 #define PTR_DIFF(p1, p2)  ((u8 *)(p1) - (u8 *)(p2))
 
 /**
@@ -882,13 +873,13 @@ static u8 *efx_tsoh_get_buffer(struct efx_tx_queue *tx_queue,
 	EFX_BUG_ON_PARANOID(buffer->flags);
 	EFX_BUG_ON_PARANOID(buffer->unmap_len);
 
-	if (likely(len <= TSOH_STD_SIZE - TSOH_OFFSET)) {
+	if (likely(len <= TSOH_STD_SIZE - NET_IP_ALIGN)) {
 		unsigned index =
 			(tx_queue->insert_count & tx_queue->ptr_mask) / 2;
 		struct efx_buffer *page_buf =
 			&tx_queue->tsoh_page[index / TSOH_PER_PAGE];
 		unsigned offset =
-			TSOH_STD_SIZE * (index % TSOH_PER_PAGE) + TSOH_OFFSET;
+			TSOH_STD_SIZE * (index % TSOH_PER_PAGE) + NET_IP_ALIGN;
 
 		if (unlikely(!page_buf->addr) &&
 		    efx_nic_alloc_buffer(tx_queue->efx, page_buf, PAGE_SIZE,
@@ -901,10 +892,10 @@ static u8 *efx_tsoh_get_buffer(struct efx_tx_queue *tx_queue,
 	} else {
 		tx_queue->tso_long_headers++;
 
-		buffer->heap_buf = kmalloc(TSOH_OFFSET + len, GFP_ATOMIC);
+		buffer->heap_buf = kmalloc(NET_IP_ALIGN + len, GFP_ATOMIC);
 		if (unlikely(!buffer->heap_buf))
 			return NULL;
-		result = (u8 *)buffer->heap_buf + TSOH_OFFSET;
+		result = (u8 *)buffer->heap_buf + NET_IP_ALIGN;
 		buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_HEAP;
 	}
 
@@ -1011,7 +1002,7 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
 static int tso_start(struct tso_state *st, struct efx_nic *efx,
 		     const struct sk_buff *skb)
 {
-	bool use_options = efx_nic_rev(efx) >= EFX_REV_HUNT_A0;
+	bool use_opt_desc = efx_nic_rev(efx) >= EFX_REV_HUNT_A0;
 	struct device *dma_dev = &efx->pci_dev->dev;
 	unsigned int header_len, in_len;
 	dma_addr_t dma_addr;
@@ -1037,7 +1028,7 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx,
 
 	st->out_len = skb->len - header_len;
 
-	if (!use_options) {
+	if (!use_opt_desc) {
 		st->header_unmap_len = 0;
 
 		if (likely(in_len == 0)) {