Add the sfxge(4) device driver, providing support for 10Gb Ethernet adapters

based on Solarflare SFC9000 family controllers.  The driver supports jumbo
frames, transmit/receive checksum offload, TCP Segmentation Offload (TSO),
Large Receive Offload (LRO), VLAN checksum offload, VLAN TSO, and Receive Side
Scaling (RSS) using MSI-X interrupts.

This work was sponsored by Solarflare Communications, Inc.

My sincere thanks to Ben Hutchings for doing a lot of the hard work!

Sponsored by:	Solarflare Communications, Inc.
MFC after:	3 weeks

1 files changed, 430 insertions, 0 deletions

diff --git a/sys/dev/sfxge/common/efx_tx.c b/sys/dev/sfxge/common/efx_tx.c
new file mode 100644
index 000000000000..0dc347c34fdd
--- /dev/null
+++ b/sys/dev/sfxge/common/efx_tx.c
@@ -0,0 +1,430 @@
+/*-
+ * Copyright 2007-2009 Solarflare Communications Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "efsys.h"
+#include "efx.h"
+#include "efx_types.h"
+#include "efx_regs.h"
+#include "efx_impl.h"
+
+#if EFSYS_OPT_QSTATS
+#define	EFX_TX_QSTAT_INCR(_etp, _stat)					\
+	do {								\
+		(_etp)->et_stat[_stat]++;				\
+	_NOTE(CONSTANTCONDITION)					\
+	} while (B_FALSE)
+#else
+#define	EFX_TX_QSTAT_INCR(_etp, _stat)
+#endif
+
+	__checkReturn	int
+efx_tx_init(
+	__in		efx_nic_t *enp)
+{
+	efx_oword_t oword;
+	int rc;
+
+	EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_NIC);
+
+	if (!(enp->en_mod_flags & EFX_MOD_EV)) {
+		rc = EINVAL;
+		goto fail1;
+	}
+
+	if (enp->en_mod_flags & EFX_MOD_TX) {
+		rc = EINVAL;
+		goto fail2;
+	}
+
+	EFSYS_ASSERT3U(enp->en_tx_qcount, ==, 0);
+
+	/*
+	 * Disable the timer-based TX DMA backoff and allow TX DMA to be
+	 * controlled by the RX FIFO fill level (although always allow a
+	 * minimal trickle).
+	 */
+	EFX_BAR_READO(enp, FR_AZ_TX_RESERVED_REG, &oword);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_RX_SPACER, 0xfe);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_RX_SPACER_EN, 1);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_ONE_PKT_PER_Q, 1);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_PUSH_EN, 0);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_DIS_NON_IP_EV, 1);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_PREF_THRESHOLD, 2);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff);
+
+	/*
+	 * Filter all packets less than 14 bytes to avoid parsing
+	 * errors.
+	 */
+	EFX_SET_OWORD_FIELD(oword, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);
+	EFX_BAR_WRITEO(enp, FR_AZ_TX_RESERVED_REG, &oword);
+
+	/*
+	 * Do not set TX_NO_EOP_DISC_EN, since it limits packets to 16
+	 * descriptors (which is bad).
+	 */
+	EFX_BAR_READO(enp, FR_AZ_TX_CFG_REG, &oword);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_NO_EOP_DISC_EN, 0);
+	EFX_BAR_WRITEO(enp, FR_AZ_TX_CFG_REG, &oword);
+
+	enp->en_mod_flags |= EFX_MOD_TX;
+	return (0);
+
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, int, rc);
+
+	return (rc);
+}
+
+#if EFSYS_OPT_FILTER
+extern	__checkReturn	int
+efx_tx_filter_insert(
+	__in		efx_txq_t *etp,
+	__inout		efx_filter_spec_t *spec)
+{
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+	EFSYS_ASSERT3P(spec, !=, NULL);
+
+	spec->efs_dmaq_id = (uint16_t)etp->et_index;
+	return efx_filter_insert_filter(etp->et_enp, spec, B_FALSE);
+}
+#endif
+
+#if EFSYS_OPT_FILTER
+extern	__checkReturn	int
+efx_tx_filter_remove(
+	__in		efx_txq_t *etp,
+	__inout		efx_filter_spec_t *spec)
+{
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+	EFSYS_ASSERT3P(spec, !=, NULL);
+
+	spec->efs_dmaq_id = (uint16_t)etp->et_index;
+	return efx_filter_remove_filter(etp->et_enp, spec);
+}
+#endif
+
+#define	EFX_TX_DESC(_etp, _addr, _size, _eop, _added)			\
+	do {								\
+		unsigned int id;					\
+		size_t offset;						\
+		efx_qword_t qword;					\
+									\
+		id = (_added)++ & (_etp)->et_mask;			\
+		offset = id * sizeof (efx_qword_t);			\
+									\
+		EFSYS_PROBE5(tx_post, unsigned int, (_etp)->et_index,	\
+		    unsigned int, id, efsys_dma_addr_t, (_addr),	\
+		    size_t, (_size), boolean_t, (_eop));		\
+									\
+		EFX_POPULATE_QWORD_4(qword,				\
+		    FSF_AZ_TX_KER_CONT, (_eop) ? 0 : 1,			\
+		    FSF_AZ_TX_KER_BYTE_COUNT, (uint32_t)(_size),	\
+		    FSF_AZ_TX_KER_BUF_ADDR_DW0,				\
+		    (uint32_t)((_addr) & 0xffffffff),			\
+		    FSF_AZ_TX_KER_BUF_ADDR_DW1,				\
+		    (uint32_t)((_addr) >> 32));				\
+		EFSYS_MEM_WRITEQ((_etp)->et_esmp, offset, &qword);	\
+									\
+		_NOTE(CONSTANTCONDITION)				\
+	} while (B_FALSE)
+
+	__checkReturn	int
+efx_tx_qpost(
+	__in		efx_txq_t *etp,
+	__in_ecount(n)	efx_buffer_t *eb,
+	__in		unsigned int n,
+	__in		unsigned int completed,
+	__inout		unsigned int *addedp)
+{
+	unsigned int added = *addedp;
+	unsigned int i;
+	int rc = ENOSPC;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	if (added - completed + n > EFX_TXQ_LIMIT(etp->et_mask + 1))
+		goto fail1;
+
+	for (i = 0; i < n; i++) {
+		efx_buffer_t *ebp = &eb[i];
+		efsys_dma_addr_t start = ebp->eb_addr;
+		size_t size = ebp->eb_size;
+		efsys_dma_addr_t end = start + size;
+
+		/* Fragments must not span 4k boundaries. */
+		EFSYS_ASSERT(P2ROUNDUP(start + 1, 4096) >= end);
+
+		EFX_TX_DESC(etp, start, size, ebp->eb_eop, added);
+	}
+
+	EFX_TX_QSTAT_INCR(etp, TX_POST);
+
+	*addedp = added;
+	return (0);
+
+fail1:
+	EFSYS_PROBE1(fail1, int, rc);
+
+	return (rc);
+}
+
+		void
+efx_tx_qpush(
+	__in	efx_txq_t *etp,
+	__in	unsigned int added)
+{
+	efx_nic_t *enp = etp->et_enp;
+	uint32_t wptr;
+	efx_dword_t dword;
+	efx_oword_t oword;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	/* Guarantee ordering of memory (descriptors) and PIO (doorbell) */
+	EFSYS_PIO_WRITE_BARRIER();
+
+	/* Push the populated descriptors out */
+	wptr = added & etp->et_mask;
+
+	EFX_POPULATE_OWORD_1(oword, FRF_AZ_TX_DESC_WPTR, wptr);
+
+	/* Only write the third DWORD */
+	EFX_POPULATE_DWORD_1(dword,
+	    EFX_DWORD_0, EFX_OWORD_FIELD(oword, EFX_DWORD_3));
+	EFX_BAR_TBL_WRITED3(enp, FR_BZ_TX_DESC_UPD_REGP0,
+			    etp->et_index, &dword, B_FALSE);
+}
+
+		void
+efx_tx_qflush(
+	__in	efx_txq_t *etp)
+{
+	efx_nic_t *enp = etp->et_enp;
+	efx_oword_t oword;
+	uint32_t label;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	label = etp->et_index;
+
+	/* Flush the queue */
+	EFX_POPULATE_OWORD_2(oword, FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
+	    FRF_AZ_TX_FLUSH_DESCQ, label);
+	EFX_BAR_WRITEO(enp, FR_AZ_TX_FLUSH_DESCQ_REG, &oword);
+}
+
+		void
+efx_tx_qenable(
+	__in	efx_txq_t *etp)
+{
+	efx_nic_t *enp = etp->et_enp;
+	efx_oword_t oword;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	EFX_BAR_TBL_READO(enp, FR_AZ_TX_DESC_PTR_TBL,
+			    etp->et_index, &oword);
+
+	EFSYS_PROBE5(tx_descq_ptr, unsigned int, etp->et_index,
+	    uint32_t, EFX_OWORD_FIELD(oword, EFX_DWORD_3),
+	    uint32_t, EFX_OWORD_FIELD(oword, EFX_DWORD_2),
+	    uint32_t, EFX_OWORD_FIELD(oword, EFX_DWORD_1),
+	    uint32_t, EFX_OWORD_FIELD(oword, EFX_DWORD_0));
+
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_DC_HW_RPTR, 0);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_DESCQ_HW_RPTR, 0);
+	EFX_SET_OWORD_FIELD(oword, FRF_AZ_TX_DESCQ_EN, 1);
+
+	EFX_BAR_TBL_WRITEO(enp, FR_AZ_TX_DESC_PTR_TBL,
+			    etp->et_index, &oword);
+}
+
+	__checkReturn	int
+efx_tx_qcreate(
+	__in		efx_nic_t *enp,
+	__in		unsigned int index,
+	__in		unsigned int label,
+	__in		efsys_mem_t *esmp,
+	__in		size_t n,
+	__in		uint32_t id,
+	__in		uint16_t flags,
+	__in		efx_evq_t *eep,
+	__deref_out	efx_txq_t **etpp)
+{
+	efx_nic_cfg_t *encp = &(enp->en_nic_cfg);
+	efx_txq_t *etp;
+	efx_oword_t oword;
+	uint32_t size;
+	int rc;
+
+	EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_TX);
+
+	EFX_STATIC_ASSERT(EFX_EV_TX_NLABELS == (1 << FRF_AZ_TX_DESCQ_LABEL_WIDTH));
+	EFSYS_ASSERT3U(label, <, EFX_EV_TX_NLABELS);
+	EFSYS_ASSERT3U(enp->en_tx_qcount + 1, <, encp->enc_txq_limit);
+
+	if (!ISP2(n) || !(n & EFX_TXQ_NDESCS_MASK)) {
+		rc = EINVAL;
+		goto fail1;
+	}
+	if (index >= encp->enc_txq_limit) {
+		rc = EINVAL;
+		goto fail2;
+	}
+	for (size = 0; (1 << size) <= (EFX_TXQ_MAXNDESCS / EFX_TXQ_MINNDESCS);
+	    size++)
+		if ((1 << size) == (int)(n / EFX_TXQ_MINNDESCS))
+			break;
+	if (id + (1 << size) >= encp->enc_buftbl_limit) {
+		rc = EINVAL;
+		goto fail3;
+	}
+
+	/* Allocate an TXQ object */
+	EFSYS_KMEM_ALLOC(enp->en_esip, sizeof (efx_txq_t), etp);
+
+	if (etp == NULL) {
+		rc = ENOMEM;
+		goto fail4;
+	}
+
+	etp->et_magic = EFX_TXQ_MAGIC;
+	etp->et_enp = enp;
+	etp->et_index = index;
+	etp->et_mask = n - 1;
+	etp->et_esmp = esmp;
+
+	/* Set up the new descriptor queue */
+	EFX_POPULATE_OWORD_6(oword,
+	    FRF_AZ_TX_DESCQ_BUF_BASE_ID, id,
+	    FRF_AZ_TX_DESCQ_EVQ_ID, eep->ee_index,
+	    FRF_AZ_TX_DESCQ_OWNER_ID, 0,
+	    FRF_AZ_TX_DESCQ_LABEL, label,
+	    FRF_AZ_TX_DESCQ_SIZE, size,
+	    FRF_AZ_TX_DESCQ_TYPE, 0);
+
+	EFX_SET_OWORD_FIELD(oword, FRF_BZ_TX_NON_IP_DROP_DIS, 1);
+	EFX_SET_OWORD_FIELD(oword, FRF_BZ_TX_IP_CHKSM_DIS,
+	    (flags & EFX_CKSUM_IPV4) ? 0 : 1);
+	EFX_SET_OWORD_FIELD(oword, FRF_BZ_TX_TCP_CHKSM_DIS,
+	    (flags & EFX_CKSUM_TCPUDP) ? 0 : 1);
+
+	EFX_BAR_TBL_WRITEO(enp, FR_AZ_TX_DESC_PTR_TBL,
+	    etp->et_index, &oword);
+
+	enp->en_tx_qcount++;
+	*etpp = etp;
+	return (0);
+
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, int, rc);
+
+	return (rc);
+}
+
+#if EFSYS_OPT_NAMES
+/* START MKCONFIG GENERATED EfxTransmitQueueStatNamesBlock 78ca9ab00287fffb */
+static const char 	__cs * __cs __efx_tx_qstat_name[] = {
+	"post",
+	"unaligned_split",
+};
+/* END MKCONFIG GENERATED EfxTransmitQueueStatNamesBlock */
+
+		const char __cs *
+efx_tx_qstat_name(
+	__in	efx_nic_t *enp,
+	__in	unsigned int id)
+{
+	_NOTE(ARGUNUSED(enp))
+	EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+	EFSYS_ASSERT3U(id, <, TX_NQSTATS);
+
+	return (__efx_tx_qstat_name[id]);
+}
+#endif	/* EFSYS_OPT_NAMES */
+
+#if EFSYS_OPT_QSTATS
+					void
+efx_tx_qstats_update(
+	__in				efx_txq_t *etp,
+	__inout_ecount(TX_NQSTATS)	efsys_stat_t *stat)
+{
+	unsigned int id;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	for (id = 0; id < TX_NQSTATS; id++) {
+		efsys_stat_t *essp = &stat[id];
+
+		EFSYS_STAT_INCR(essp, etp->et_stat[id]);
+		etp->et_stat[id] = 0;
+	}
+}
+#endif	/* EFSYS_OPT_QSTATS */
+
+		void
+efx_tx_qdestroy(
+	__in	efx_txq_t *etp)
+{
+	efx_nic_t *enp = etp->et_enp;
+	efx_oword_t oword;
+
+	EFSYS_ASSERT3U(etp->et_magic, ==, EFX_TXQ_MAGIC);
+
+	EFSYS_ASSERT(enp->en_tx_qcount != 0);
+	--enp->en_tx_qcount;
+
+	/* Purge descriptor queue */
+	EFX_ZERO_OWORD(oword);
+
+	EFX_BAR_TBL_WRITEO(enp, FR_AZ_TX_DESC_PTR_TBL,
+			    etp->et_index, &oword);
+
+	/* Free the TXQ object */
+	EFSYS_KMEM_FREE(enp->en_esip, sizeof (efx_txq_t), etp);
+}
+
+		void
+efx_tx_fini(
+	__in	efx_nic_t *enp)
+{
+	EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_NIC);
+	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_TX);
+	EFSYS_ASSERT3U(enp->en_tx_qcount, ==, 0);
+
+	enp->en_mod_flags &= ~EFX_MOD_TX;
+}