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authorDavid S. Miller <davem@davemloft.net>2020-06-11 18:39:08 -0700
committerDavid S. Miller <davem@davemloft.net>2020-06-11 18:39:08 -0700
commit18dbd4cd9b8c957025cf90a3c50102b31bde14f7 (patch)
tree905d63da5236dd5d1bb37ddf48fd9ebd04598e0b
parentc25cba3689c7ab5ae6ee7228d1d49a5652429229 (diff)
parentf330fda331d276464baec8ba938d031b4adcf5c7 (diff)
downloadlinux-18dbd4cd9b8c957025cf90a3c50102b31bde14f7.tar.gz
Merge branch 'net-ipa-endpoint-configuration-fixes'
Alex Elder says: ==================== net: ipa: endpoint configuration fixes This series fixes four bugs in the configuration of IPA endpoints. See the description of each for more information. In this version I have dropped the last patch from the series, and restored a "static" keyword that had inadvertently gotten removed. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ipa/ipa_data-sc7180.c2
-rw-r--r--drivers/net/ipa/ipa_endpoint.c95
-rw-r--r--drivers/net/ipa/ipa_reg.h2
3 files changed, 60 insertions, 39 deletions
diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-sc7180.c
index 43faa35..d4c2bc7 100644
--- a/drivers/net/ipa/ipa_data-sc7180.c
+++ b/drivers/net/ipa/ipa_data-sc7180.c
@@ -106,7 +106,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
[IPA_ENDPOINT_MODEM_LAN_RX] = {
.ee_id = GSI_EE_MODEM,
.channel_id = 3,
- .endpoint_id = 13,
+ .endpoint_id = 11,
.toward_ipa = false,
},
[IPA_ENDPOINT_MODEM_AP_TX] = {
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 66649a8..9f50d0d 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -32,6 +32,9 @@
/* The amount of RX buffer space consumed by standard skb overhead */
#define IPA_RX_BUFFER_OVERHEAD (PAGE_SIZE - SKB_MAX_ORDER(NET_SKB_PAD, 0))
+/* Where to find the QMAP mux_id for a packet within modem-supplied metadata */
+#define IPA_ENDPOINT_QMAP_METADATA_MASK 0x000000ff /* host byte order */
+
#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX 3
#define IPA_AGGR_TIME_LIMIT_DEFAULT 1000 /* microseconds */
@@ -433,6 +436,24 @@ static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
iowrite32(val, endpoint->ipa->reg_virt + offset);
}
+/**
+ * We program QMAP endpoints so each packet received is preceded by a QMAP
+ * header structure. The QMAP header contains a 1-byte mux_id and 2-byte
+ * packet size field, and we have the IPA hardware populate both for each
+ * received packet. The header is configured (in the HDR_EXT register)
+ * to use big endian format.
+ *
+ * The packet size is written into the QMAP header's pkt_len field. That
+ * location is defined here using the HDR_OFST_PKT_SIZE field.
+ *
+ * The mux_id comes from a 4-byte metadata value supplied with each packet
+ * by the modem. It is *not* a QMAP header, but it does contain the mux_id
+ * value that we want, in its low-order byte. A bitmask defined in the
+ * endpoint's METADATA_MASK register defines which byte within the modem
+ * metadata contains the mux_id. And the OFST_METADATA field programmed
+ * here indicates where the extracted byte should be placed within the QMAP
+ * header.
+ */
static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
{
u32 offset = IPA_REG_ENDP_INIT_HDR_N_OFFSET(endpoint->endpoint_id);
@@ -441,25 +462,31 @@ static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
if (endpoint->data->qmap) {
size_t header_size = sizeof(struct rmnet_map_header);
+ /* We might supply a checksum header after the QMAP header */
if (endpoint->toward_ipa && endpoint->data->checksum)
header_size += sizeof(struct rmnet_map_ul_csum_header);
-
val |= u32_encode_bits(header_size, HDR_LEN_FMASK);
- /* metadata is the 4 byte rmnet_map header itself */
- val |= HDR_OFST_METADATA_VALID_FMASK;
- val |= u32_encode_bits(0, HDR_OFST_METADATA_FMASK);
- /* HDR_ADDITIONAL_CONST_LEN is 0; (IPA->AP only) */
+
+ /* Define how to fill fields in a received QMAP header */
if (!endpoint->toward_ipa) {
- u32 size_offset = offsetof(struct rmnet_map_header,
- pkt_len);
+ u32 off; /* Field offset within header */
+
+ /* Where IPA will write the metadata value */
+ off = offsetof(struct rmnet_map_header, mux_id);
+ val |= u32_encode_bits(off, HDR_OFST_METADATA_FMASK);
+ /* Where IPA will write the length */
+ off = offsetof(struct rmnet_map_header, pkt_len);
val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
- val |= u32_encode_bits(size_offset,
- HDR_OFST_PKT_SIZE_FMASK);
+ val |= u32_encode_bits(off, HDR_OFST_PKT_SIZE_FMASK);
}
+ /* For QMAP TX, metadata offset is 0 (modem assumes this) */
+ val |= HDR_OFST_METADATA_VALID_FMASK;
+
+ /* HDR_ADDITIONAL_CONST_LEN is 0; (RX only) */
/* HDR_A5_MUX is 0 */
/* HDR_LEN_INC_DEAGG_HDR is 0 */
- /* HDR_METADATA_REG_VALID is 0; (AP->IPA only) */
+ /* HDR_METADATA_REG_VALID is 0 (TX only) */
}
iowrite32(val, endpoint->ipa->reg_virt + offset);
@@ -472,38 +499,27 @@ static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
u32 val = 0;
val |= HDR_ENDIANNESS_FMASK; /* big endian */
- val |= HDR_TOTAL_LEN_OR_PAD_VALID_FMASK;
- /* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
+
+ /* A QMAP header contains a 6 bit pad field at offset 0. The RMNet
+ * driver assumes this field is meaningful in packets it receives,
+ * and assumes the header's payload length includes that padding.
+ * The RMNet driver does *not* pad packets it sends, however, so
+ * the pad field (although 0) should be ignored.
+ */
+ if (endpoint->data->qmap && !endpoint->toward_ipa) {
+ val |= HDR_TOTAL_LEN_OR_PAD_VALID_FMASK;
+ /* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
+ val |= HDR_PAYLOAD_LEN_INC_PADDING_FMASK;
+ /* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
+ }
+
/* HDR_PAYLOAD_LEN_INC_PADDING is 0 */
- /* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
if (!endpoint->toward_ipa)
val |= u32_encode_bits(pad_align, HDR_PAD_TO_ALIGNMENT_FMASK);
iowrite32(val, endpoint->ipa->reg_virt + offset);
}
-/**
- * Generate a metadata mask value that will select only the mux_id
- * field in an rmnet_map header structure. The mux_id is at offset
- * 1 byte from the beginning of the structure, but the metadata
- * value is treated as a 4-byte unit. So this mask must be computed
- * with endianness in mind. Note that ipa_endpoint_init_hdr_metadata_mask()
- * will convert this value to the proper byte order.
- *
- * Marked __always_inline because this is really computing a
- * constant value.
- */
-static __always_inline __be32 ipa_rmnet_mux_id_metadata_mask(void)
-{
- size_t mux_id_offset = offsetof(struct rmnet_map_header, mux_id);
- u32 mux_id_mask = 0;
- u8 *bytes;
-
- bytes = (u8 *)&mux_id_mask;
- bytes[mux_id_offset] = 0xff; /* mux_id is 1 byte */
-
- return cpu_to_be32(mux_id_mask);
-}
static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
{
@@ -513,8 +529,9 @@ static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
+ /* Note that HDR_ENDIANNESS indicates big endian header fields */
if (!endpoint->toward_ipa && endpoint->data->qmap)
- val = ipa_rmnet_mux_id_metadata_mask();
+ val = cpu_to_be32(IPA_ENDPOINT_QMAP_METADATA_MASK);
iowrite32(val, endpoint->ipa->reg_virt + offset);
}
@@ -693,10 +710,12 @@ static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
u32 seq_type = endpoint->seq_type;
u32 val = 0;
+ /* Sequencer type is made up of four nibbles */
val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
- /* HPS_REP_SEQ_TYPE is 0 */
- /* DPS_REP_SEQ_TYPE is 0 */
+ /* The second two apply to replicated packets */
+ val |= u32_encode_bits((seq_type >> 8) & 0xf, HPS_REP_SEQ_TYPE_FMASK);
+ val |= u32_encode_bits((seq_type >> 12) & 0xf, DPS_REP_SEQ_TYPE_FMASK);
iowrite32(val, endpoint->ipa->reg_virt + offset);
}
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index 3b8106a..0a688d8 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -455,6 +455,8 @@ enum ipa_mode {
* second packet processing pass + no decipher + microcontroller
* @IPA_SEQ_DMA_DEC: DMA + cipher/decipher
* @IPA_SEQ_DMA_COMP_DECOMP: DMA + compression/decompression
+ * @IPA_SEQ_PKT_PROCESS_NO_DEC_NO_UCP_DMAP:
+ * packet processing + no decipher + no uCP + HPS REP DMA parser
* @IPA_SEQ_INVALID: invalid sequencer type
*
* The values defined here are broken into 4-bit nibbles that are written